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| author | 2015-06-29 20:16:15 +0000 | |
|---|---|---|
| committer | 2015-06-29 20:16:15 +0000 | |
| commit | 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch) | |
| tree | 8c64d6e8be006486d975a651505fbbde61365cd6 /src/regex_syntax/lib.rs.html | |
| download | irsc-gh-pages.tar.gz irsc-gh-pages.tar.xz irsc-gh-pages.zip | |
Update documentationgh-pages
Diffstat (limited to 'src/regex_syntax/lib.rs.html')
| -rw-r--r-- | src/regex_syntax/lib.rs.html | 2465 |
1 files changed, 2465 insertions, 0 deletions
diff --git a/src/regex_syntax/lib.rs.html b/src/regex_syntax/lib.rs.html new file mode 100644 index 0000000..7c8b82b --- /dev/null +++ b/src/regex_syntax/lib.rs.html @@ -0,0 +1,2465 @@ +<!DOCTYPE html> +<html lang="en"> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <meta name="generator" content="rustdoc"> + <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/regex-syntax-0.1.2/src/lib.rs`."> + <meta name="keywords" content="rust, rustlang, rust-lang"> + + <title>lib.rs.html -- source</title> + + <link rel="stylesheet" type="text/css" href="../../main.css"> + + + +</head> +<body class="rustdoc"> + <!--[if lte IE 8]> + <div class="warning"> + This old browser is unsupported and will most likely display funky + things. + </div> + <![endif]--> + + + + <section class="sidebar"> + + + </section> + + <nav class="sub"> + <form class="search-form js-only"> + <div class="search-container"> + <input class="search-input" name="search" + autocomplete="off" + placeholder="Click or press 'S' to search, '?' for more options..." + type="search"> + </div> + </form> + </nav> + + <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span> +<span id="2"> 2</span> +<span id="3"> 3</span> +<span id="4"> 4</span> +<span id="5"> 5</span> +<span id="6"> 6</span> +<span id="7"> 7</span> +<span id="8"> 8</span> +<span id="9"> 9</span> +<span id="10"> 10</span> +<span id="11"> 11</span> +<span id="12"> 12</span> +<span id="13"> 13</span> +<span id="14"> 14</span> +<span id="15"> 15</span> +<span id="16"> 16</span> +<span id="17"> 17</span> +<span id="18"> 18</span> +<span id="19"> 19</span> +<span id="20"> 20</span> +<span id="21"> 21</span> +<span id="22"> 22</span> +<span id="23"> 23</span> +<span id="24"> 24</span> +<span id="25"> 25</span> +<span id="26"> 26</span> +<span id="27"> 27</span> +<span id="28"> 28</span> +<span 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640</span> +<span id="641"> 641</span> +<span id="642"> 642</span> +<span id="643"> 643</span> +<span id="644"> 644</span> +<span id="645"> 645</span> +<span id="646"> 646</span> +<span id="647"> 647</span> +<span id="648"> 648</span> +<span id="649"> 649</span> +<span id="650"> 650</span> +<span id="651"> 651</span> +<span id="652"> 652</span> +<span id="653"> 653</span> +<span id="654"> 654</span> +<span id="655"> 655</span> +<span id="656"> 656</span> +<span id="657"> 657</span> +<span id="658"> 658</span> +<span id="659"> 659</span> +<span id="660"> 660</span> +<span id="661"> 661</span> +<span id="662"> 662</span> +<span id="663"> 663</span> +<span id="664"> 664</span> +<span id="665"> 665</span> +<span id="666"> 666</span> +<span id="667"> 667</span> +<span id="668"> 668</span> +<span id="669"> 669</span> +<span id="670"> 670</span> +<span id="671"> 671</span> +<span id="672"> 672</span> +<span id="673"> 673</span> +<span id="674"> 674</span> +<span id="675"> 675</span> +<span id="676"> 676</span> +<span id="677"> 677</span> +<span id="678"> 678</span> +<span id="679"> 679</span> +<span id="680"> 680</span> +<span id="681"> 681</span> +<span id="682"> 682</span> +<span id="683"> 683</span> +<span id="684"> 684</span> +<span id="685"> 685</span> +<span id="686"> 686</span> +<span id="687"> 687</span> +<span id="688"> 688</span> +<span id="689"> 689</span> +<span id="690"> 690</span> +<span id="691"> 691</span> +<span id="692"> 692</span> +<span id="693"> 693</span> +<span id="694"> 694</span> +<span id="695"> 695</span> +<span id="696"> 696</span> +<span id="697"> 697</span> +<span id="698"> 698</span> +<span id="699"> 699</span> +<span id="700"> 700</span> +<span id="701"> 701</span> +<span id="702"> 702</span> +<span id="703"> 703</span> +<span id="704"> 704</span> +<span id="705"> 705</span> +<span id="706"> 706</span> +<span id="707"> 707</span> +<span id="708"> 708</span> +<span id="709"> 709</span> +<span id="710"> 710</span> +<span id="711"> 711</span> +<span id="712"> 712</span> +<span id="713"> 713</span> +<span id="714"> 714</span> +<span id="715"> 715</span> +<span id="716"> 716</span> +<span id="717"> 717</span> +<span id="718"> 718</span> +<span id="719"> 719</span> +<span id="720"> 720</span> +<span id="721"> 721</span> +<span id="722"> 722</span> +<span id="723"> 723</span> +<span id="724"> 724</span> +<span id="725"> 725</span> +<span id="726"> 726</span> +<span id="727"> 727</span> +<span id="728"> 728</span> +<span id="729"> 729</span> +<span id="730"> 730</span> +<span id="731"> 731</span> +<span id="732"> 732</span> +<span id="733"> 733</span> +<span id="734"> 734</span> +<span id="735"> 735</span> +<span id="736"> 736</span> +<span id="737"> 737</span> +<span id="738"> 738</span> +<span id="739"> 739</span> +<span id="740"> 740</span> +<span id="741"> 741</span> +<span id="742"> 742</span> +<span id="743"> 743</span> +<span id="744"> 744</span> +<span id="745"> 745</span> +<span id="746"> 746</span> +<span id="747"> 747</span> +<span id="748"> 748</span> +<span id="749"> 749</span> +<span id="750"> 750</span> +<span id="751"> 751</span> +<span id="752"> 752</span> +<span id="753"> 753</span> +<span id="754"> 754</span> +<span id="755"> 755</span> +<span id="756"> 756</span> +<span id="757"> 757</span> +<span id="758"> 758</span> +<span id="759"> 759</span> +<span id="760"> 760</span> +<span id="761"> 761</span> +<span id="762"> 762</span> +<span id="763"> 763</span> +<span id="764"> 764</span> +<span id="765"> 765</span> +<span id="766"> 766</span> +<span id="767"> 767</span> +<span id="768"> 768</span> +<span id="769"> 769</span> +<span id="770"> 770</span> +<span id="771"> 771</span> +<span id="772"> 772</span> +<span id="773"> 773</span> +<span id="774"> 774</span> +<span id="775"> 775</span> +<span id="776"> 776</span> +<span id="777"> 777</span> +<span id="778"> 778</span> +<span id="779"> 779</span> +<span id="780"> 780</span> +<span id="781"> 781</span> +<span id="782"> 782</span> +<span id="783"> 783</span> +<span id="784"> 784</span> +<span id="785"> 785</span> +<span id="786"> 786</span> +<span id="787"> 787</span> +<span id="788"> 788</span> +<span id="789"> 789</span> +<span id="790"> 790</span> +<span id="791"> 791</span> +<span id="792"> 792</span> +<span id="793"> 793</span> +<span id="794"> 794</span> +<span id="795"> 795</span> +<span id="796"> 796</span> +<span id="797"> 797</span> +<span id="798"> 798</span> +<span id="799"> 799</span> +<span id="800"> 800</span> +<span id="801"> 801</span> +<span id="802"> 802</span> +<span id="803"> 803</span> +<span id="804"> 804</span> +<span id="805"> 805</span> +<span id="806"> 806</span> +<span id="807"> 807</span> +<span id="808"> 808</span> +<span id="809"> 809</span> +<span id="810"> 810</span> +<span id="811"> 811</span> +<span id="812"> 812</span> +<span id="813"> 813</span> +<span id="814"> 814</span> +<span id="815"> 815</span> +<span id="816"> 816</span> +<span id="817"> 817</span> +<span id="818"> 818</span> +<span id="819"> 819</span> +<span id="820"> 820</span> +<span id="821"> 821</span> +<span id="822"> 822</span> +<span id="823"> 823</span> +<span id="824"> 824</span> +<span id="825"> 825</span> +<span id="826"> 826</span> +<span id="827"> 827</span> +<span id="828"> 828</span> +<span id="829"> 829</span> +<span id="830"> 830</span> +<span id="831"> 831</span> +<span id="832"> 832</span> +<span id="833"> 833</span> +<span id="834"> 834</span> +<span id="835"> 835</span> +<span id="836"> 836</span> +<span id="837"> 837</span> +<span id="838"> 838</span> +<span id="839"> 839</span> +<span id="840"> 840</span> +<span id="841"> 841</span> +<span id="842"> 842</span> +<span id="843"> 843</span> +<span id="844"> 844</span> +<span id="845"> 845</span> +<span id="846"> 846</span> +<span id="847"> 847</span> +<span id="848"> 848</span> +<span id="849"> 849</span> +<span id="850"> 850</span> +<span id="851"> 851</span> +<span id="852"> 852</span> +<span id="853"> 853</span> +<span id="854"> 854</span> +<span id="855"> 855</span> +<span id="856"> 856</span> +<span id="857"> 857</span> +<span id="858"> 858</span> +<span id="859"> 859</span> +<span id="860"> 860</span> +<span id="861"> 861</span> +<span id="862"> 862</span> +<span id="863"> 863</span> +<span id="864"> 864</span> +<span id="865"> 865</span> +<span id="866"> 866</span> +<span id="867"> 867</span> +<span id="868"> 868</span> +<span id="869"> 869</span> +<span id="870"> 870</span> +<span id="871"> 871</span> +<span id="872"> 872</span> +<span id="873"> 873</span> +<span id="874"> 874</span> +<span id="875"> 875</span> +<span id="876"> 876</span> +<span id="877"> 877</span> +<span id="878"> 878</span> +<span id="879"> 879</span> +<span id="880"> 880</span> +<span id="881"> 881</span> +<span id="882"> 882</span> +<span id="883"> 883</span> +<span id="884"> 884</span> +<span id="885"> 885</span> +<span id="886"> 886</span> +<span id="887"> 887</span> +<span id="888"> 888</span> +<span id="889"> 889</span> +<span id="890"> 890</span> +<span id="891"> 891</span> +<span id="892"> 892</span> +<span id="893"> 893</span> +<span id="894"> 894</span> +<span id="895"> 895</span> +<span id="896"> 896</span> +<span id="897"> 897</span> +<span id="898"> 898</span> +<span id="899"> 899</span> +<span id="900"> 900</span> +<span id="901"> 901</span> +<span id="902"> 902</span> +<span id="903"> 903</span> +<span id="904"> 904</span> +<span id="905"> 905</span> +<span id="906"> 906</span> +<span id="907"> 907</span> +<span id="908"> 908</span> +<span id="909"> 909</span> +<span id="910"> 910</span> +<span id="911"> 911</span> +<span id="912"> 912</span> +<span id="913"> 913</span> +<span id="914"> 914</span> +<span id="915"> 915</span> +<span id="916"> 916</span> +<span id="917"> 917</span> +<span id="918"> 918</span> +<span id="919"> 919</span> +<span id="920"> 920</span> +<span id="921"> 921</span> +<span id="922"> 922</span> +<span id="923"> 923</span> +<span id="924"> 924</span> +<span id="925"> 925</span> +<span id="926"> 926</span> +<span id="927"> 927</span> +<span id="928"> 928</span> +<span id="929"> 929</span> +<span id="930"> 930</span> +<span id="931"> 931</span> +<span id="932"> 932</span> +<span id="933"> 933</span> +<span id="934"> 934</span> +<span id="935"> 935</span> +<span id="936"> 936</span> +<span id="937"> 937</span> +<span id="938"> 938</span> +<span id="939"> 939</span> +<span id="940"> 940</span> +<span id="941"> 941</span> +<span id="942"> 942</span> +<span id="943"> 943</span> +<span id="944"> 944</span> +<span id="945"> 945</span> +<span id="946"> 946</span> +<span id="947"> 947</span> +<span id="948"> 948</span> +<span id="949"> 949</span> +<span id="950"> 950</span> +<span id="951"> 951</span> +<span id="952"> 952</span> +<span id="953"> 953</span> +<span id="954"> 954</span> +<span id="955"> 955</span> +<span id="956"> 956</span> +<span id="957"> 957</span> +<span id="958"> 958</span> +<span id="959"> 959</span> +<span id="960"> 960</span> +<span id="961"> 961</span> +<span id="962"> 962</span> +<span id="963"> 963</span> +<span id="964"> 964</span> +<span id="965"> 965</span> +<span id="966"> 966</span> +<span id="967"> 967</span> +<span id="968"> 968</span> +<span id="969"> 969</span> +<span id="970"> 970</span> +<span id="971"> 971</span> +<span id="972"> 972</span> +<span id="973"> 973</span> +<span id="974"> 974</span> +<span id="975"> 975</span> +<span id="976"> 976</span> +<span id="977"> 977</span> +<span id="978"> 978</span> +<span id="979"> 979</span> +<span id="980"> 980</span> +<span id="981"> 981</span> +<span id="982"> 982</span> +<span id="983"> 983</span> +<span id="984"> 984</span> +<span id="985"> 985</span> +<span id="986"> 986</span> +<span id="987"> 987</span> +<span id="988"> 988</span> +<span id="989"> 989</span> +<span id="990"> 990</span> +<span id="991"> 991</span> +<span id="992"> 992</span> +<span id="993"> 993</span> +<span id="994"> 994</span> +<span id="995"> 995</span> +<span id="996"> 996</span> +<span id="997"> 997</span> +<span id="998"> 998</span> +<span id="999"> 999</span> +<span id="1000">1000</span> +<span id="1001">1001</span> +<span id="1002">1002</span> +<span id="1003">1003</span> +<span id="1004">1004</span> +<span id="1005">1005</span> +<span id="1006">1006</span> +<span id="1007">1007</span> +<span id="1008">1008</span> +<span id="1009">1009</span> +<span id="1010">1010</span> +<span id="1011">1011</span> +<span id="1012">1012</span> +<span id="1013">1013</span> +<span id="1014">1014</span> +<span id="1015">1015</span> +<span id="1016">1016</span> +<span id="1017">1017</span> +<span id="1018">1018</span> +<span id="1019">1019</span> +<span id="1020">1020</span> +<span id="1021">1021</span> +<span id="1022">1022</span> +<span id="1023">1023</span> +<span id="1024">1024</span> +<span id="1025">1025</span> +<span id="1026">1026</span> +<span id="1027">1027</span> +<span id="1028">1028</span> +<span id="1029">1029</span> +<span id="1030">1030</span> +<span id="1031">1031</span> +<span id="1032">1032</span> +<span id="1033">1033</span> +<span id="1034">1034</span> +<span id="1035">1035</span> +<span id="1036">1036</span> +<span id="1037">1037</span> +<span id="1038">1038</span> +<span id="1039">1039</span> +<span id="1040">1040</span> +<span id="1041">1041</span> +<span id="1042">1042</span> +<span id="1043">1043</span> +<span id="1044">1044</span> +<span id="1045">1045</span> +<span id="1046">1046</span> +<span id="1047">1047</span> +<span id="1048">1048</span> +<span id="1049">1049</span> +<span id="1050">1050</span> +<span id="1051">1051</span> +<span id="1052">1052</span> +<span id="1053">1053</span> +<span id="1054">1054</span> +<span id="1055">1055</span> +<span id="1056">1056</span> +<span id="1057">1057</span> +<span id="1058">1058</span> +<span id="1059">1059</span> +<span id="1060">1060</span> +<span id="1061">1061</span> +<span id="1062">1062</span> +<span id="1063">1063</span> +<span id="1064">1064</span> +<span id="1065">1065</span> +<span id="1066">1066</span> +<span id="1067">1067</span> +<span id="1068">1068</span> +<span id="1069">1069</span> +<span id="1070">1070</span> +<span id="1071">1071</span> +<span id="1072">1072</span> +<span id="1073">1073</span> +<span id="1074">1074</span> +<span id="1075">1075</span> +<span id="1076">1076</span> +<span id="1077">1077</span> +<span id="1078">1078</span> +<span id="1079">1079</span> +<span id="1080">1080</span> +<span id="1081">1081</span> +<span id="1082">1082</span> +<span id="1083">1083</span> +<span id="1084">1084</span> +<span id="1085">1085</span> +<span id="1086">1086</span> +<span id="1087">1087</span> +<span id="1088">1088</span> +<span id="1089">1089</span> +<span id="1090">1090</span> +<span id="1091">1091</span> +<span id="1092">1092</span> +<span id="1093">1093</span> +<span id="1094">1094</span> +<span id="1095">1095</span> +<span id="1096">1096</span> +<span id="1097">1097</span> +<span id="1098">1098</span> +<span id="1099">1099</span> +<span id="1100">1100</span> +<span id="1101">1101</span> +<span id="1102">1102</span> +<span id="1103">1103</span> +<span id="1104">1104</span> +<span id="1105">1105</span> +<span id="1106">1106</span> +<span id="1107">1107</span> +<span id="1108">1108</span> +<span id="1109">1109</span> +<span id="1110">1110</span> +<span id="1111">1111</span> +<span id="1112">1112</span> +<span id="1113">1113</span> +<span id="1114">1114</span> +<span id="1115">1115</span> +<span id="1116">1116</span> +<span id="1117">1117</span> +<span id="1118">1118</span> +<span id="1119">1119</span> +<span id="1120">1120</span> +<span id="1121">1121</span> +<span id="1122">1122</span> +<span id="1123">1123</span> +<span id="1124">1124</span> +<span id="1125">1125</span> +<span id="1126">1126</span> +<span id="1127">1127</span> +<span id="1128">1128</span> +<span id="1129">1129</span> +<span id="1130">1130</span> +<span id="1131">1131</span> +<span id="1132">1132</span> +<span id="1133">1133</span> +<span id="1134">1134</span> +<span id="1135">1135</span> +<span id="1136">1136</span> +<span id="1137">1137</span> +<span id="1138">1138</span> +<span id="1139">1139</span> +<span id="1140">1140</span> +<span id="1141">1141</span> +<span id="1142">1142</span> +<span id="1143">1143</span> +<span id="1144">1144</span> +<span id="1145">1145</span> +<span id="1146">1146</span> +<span id="1147">1147</span> +<span id="1148">1148</span> +<span id="1149">1149</span> +<span id="1150">1150</span> +<span id="1151">1151</span> +<span id="1152">1152</span> +<span id="1153">1153</span> +<span id="1154">1154</span> +<span id="1155">1155</span> +<span id="1156">1156</span> +<span id="1157">1157</span> +<span id="1158">1158</span> +<span id="1159">1159</span> +<span id="1160">1160</span> +<span id="1161">1161</span> +<span id="1162">1162</span> +<span id="1163">1163</span> +<span id="1164">1164</span> +<span id="1165">1165</span> +<span id="1166">1166</span> +<span id="1167">1167</span> +<span id="1168">1168</span> +<span id="1169">1169</span> +<span id="1170">1170</span> +<span id="1171">1171</span> +<span id="1172">1172</span> +<span id="1173">1173</span> +<span id="1174">1174</span> +<span id="1175">1175</span> +<span id="1176">1176</span> +<span id="1177">1177</span> +<span id="1178">1178</span> +<span id="1179">1179</span> +<span id="1180">1180</span> +<span id="1181">1181</span> +<span id="1182">1182</span> +<span id="1183">1183</span> +<span id="1184">1184</span> +</pre><pre class='rust '> +<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span> +<span class='comment'>// file at the top-level directory of this distribution and at</span> +<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span> +<span class='comment'>//</span> +<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> +<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> +<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> +<span class='comment'>// option. This file may not be copied, modified, or distributed</span> +<span class='comment'>// except according to those terms.</span> + +<span class='doccomment'>/*! +This crate provides a regular expression parser and an abstract syntax for +regular expressions. The abstract syntax is defined by the `Expr` type. The +concrete syntax is enumerated in the +[`regex`](../regex/index.html#syntax) +crate documentation. + +Note that since this crate is first and foremost an implementation detail for +the `regex` crate, it may experience more frequent breaking changes. It is +exposed as a separate crate so that others may use it to do analysis on regular +expressions or even build their own matching engine. + +# Example: parsing an expression + +Parsing a regular expression can be done with the `Expr::parse` function. + +```rust +use regex_syntax::Expr; + +assert_eq!(Expr::parse(r"ab|yz").unwrap(), Expr::Alternate(vec![ + Expr::Literal { chars: vec!['a', 'b'], casei: false }, + Expr::Literal { chars: vec!['y', 'z'], casei: false }, +])); +``` + +# Example: inspecting an error + +The parser in this crate provides very detailed error values. For example, +if an invalid character class range is given: + +```rust +use regex_syntax::{Expr, ErrorKind}; + +let err = Expr::parse(r"[z-a]").unwrap_err(); +assert_eq!(err.position(), 4); +assert_eq!(err.kind(), &ErrorKind::InvalidClassRange { + start: 'z', + end: 'a', +}); +``` + +Or unbalanced parentheses: + +```rust +use regex_syntax::{Expr, ErrorKind}; + +let err = Expr::parse(r"ab(cd").unwrap_err(); +assert_eq!(err.position(), 2); +assert_eq!(err.kind(), &ErrorKind::UnclosedParen); +``` +*/</span> + +<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>deny</span>(<span class='ident'>missing_docs</span>)]</span> + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>quickcheck</span>; +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>rand</span>; + +<span class='kw'>mod</span> <span class='ident'>parser</span>; +<span class='kw'>mod</span> <span class='ident'>unicode</span>; + +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>char</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::{<span class='ident'>Ordering</span>, <span class='ident'>max</span>, <span class='ident'>min</span>}; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>IntoIterator</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>slice</span>; +<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>vec</span>; + +<span class='kw'>use</span> <span class='ident'>unicode</span>::<span class='ident'>case_folding</span>; + +<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Expr</span>::<span class='op'>*</span>; +<span class='kw'>use</span> <span class='self'>self</span>::<span class='ident'>Repeater</span>::<span class='op'>*</span>; + +<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>; + +<span class='doccomment'>/// A regular expression abstract syntax tree.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// An `Expr` represents the abstract syntax of a regular expression.</span> +<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Expr</span> { + <span class='doccomment'>/// An empty regex (which never matches any text).</span> + <span class='ident'>Empty</span>, + <span class='doccomment'>/// A sequence of one or more literal characters to be matched.</span> + <span class='ident'>Literal</span> { + <span class='doccomment'>/// The characters.</span> + <span class='ident'>chars</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>char</span><span class='op'>></span>, + <span class='doccomment'>/// Whether to match case insensitively.</span> + <span class='ident'>casei</span>: <span class='ident'>bool</span>, + }, + <span class='doccomment'>/// Match any character, excluding new line.</span> + <span class='ident'>AnyChar</span>, + <span class='doccomment'>/// Match any character.</span> + <span class='ident'>AnyCharNoNL</span>, + <span class='doccomment'>/// A character class.</span> + <span class='ident'>Class</span>(<span class='ident'>CharClass</span>), + <span class='doccomment'>/// Match the start of a line or beginning of input.</span> + <span class='ident'>StartLine</span>, + <span class='doccomment'>/// Match the end of a line or end of input.</span> + <span class='ident'>EndLine</span>, + <span class='doccomment'>/// Match the beginning of input.</span> + <span class='ident'>StartText</span>, + <span class='doccomment'>/// Match the end of input.</span> + <span class='ident'>EndText</span>, + <span class='doccomment'>/// Match a word boundary (word character on one side and a non-word</span> + <span class='doccomment'>/// character on the other).</span> + <span class='ident'>WordBoundary</span>, + <span class='doccomment'>/// Match a position that is not a word boundary (word or non-word</span> + <span class='doccomment'>/// characters on both sides).</span> + <span class='ident'>NotWordBoundary</span>, + <span class='doccomment'>/// A group, possibly non-capturing.</span> + <span class='ident'>Group</span> { + <span class='doccomment'>/// The expression inside the group.</span> + <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'><</span><span class='ident'>Expr</span><span class='op'>></span>, + <span class='doccomment'>/// The capture index (starting at `1`) only for capturing groups.</span> + <span class='ident'>i</span>: <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>usize</span><span class='op'>></span>, + <span class='doccomment'>/// The capture name, only for capturing named groups.</span> + <span class='ident'>name</span>: <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>String</span><span class='op'>></span>, + }, + <span class='doccomment'>/// A repeat operator (`?`, `*`, `+` or `{m,n}`).</span> + <span class='ident'>Repeat</span> { + <span class='doccomment'>/// The expression to be repeated. Limited to literals, `.`, classes</span> + <span class='doccomment'>/// or grouped expressions.</span> + <span class='ident'>e</span>: <span class='ident'>Box</span><span class='op'><</span><span class='ident'>Expr</span><span class='op'>></span>, + <span class='doccomment'>/// The type of repeat operator used.</span> + <span class='ident'>r</span>: <span class='ident'>Repeater</span>, + <span class='doccomment'>/// Whether the repeat is greedy (match the most) or not (match the</span> + <span class='doccomment'>/// least).</span> + <span class='ident'>greedy</span>: <span class='ident'>bool</span>, + }, + <span class='doccomment'>/// A concatenation of expressions. Must be matched one after the other.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// N.B. A concat expression can only appear at the top-level or</span> + <span class='doccomment'>/// immediately inside a group expression.</span> + <span class='ident'>Concat</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Expr</span><span class='op'>></span>), + <span class='doccomment'>/// An alternation of expressions. Only one must match.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// N.B. An alternate expression can only appear at the top-level or</span> + <span class='doccomment'>/// immediately inside a group expression.</span> + <span class='ident'>Alternate</span>(<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Expr</span><span class='op'>></span>), +} + +<span class='kw'>type</span> <span class='ident'>CaptureIndex</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>usize</span><span class='op'>></span>; + +<span class='kw'>type</span> <span class='ident'>CaptureName</span> <span class='op'>=</span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>String</span><span class='op'>></span>; + +<span class='doccomment'>/// The type of a repeat operator expression.</span> +<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>Repeater</span> { + <span class='doccomment'>/// Match zero or one (`?`).</span> + <span class='ident'>ZeroOrOne</span>, + <span class='doccomment'>/// Match zero or more (`*`).</span> + <span class='ident'>ZeroOrMore</span>, + <span class='doccomment'>/// Match one or more (`+`).</span> + <span class='ident'>OneOrMore</span>, + <span class='doccomment'>/// Match for at least `min` and at most `max` (`{m,n}`).</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// When `max` is `None`, there is no upper bound on the number of matches.</span> + <span class='ident'>Range</span> { + <span class='doccomment'>/// Lower bound on the number of matches.</span> + <span class='ident'>min</span>: <span class='ident'>u32</span>, + <span class='doccomment'>/// Optional upper bound on the number of matches.</span> + <span class='ident'>max</span>: <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>u32</span><span class='op'>></span>, + }, +} + +<span class='doccomment'>/// A character class.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// A character class has a canonical format that the parser guarantees. Its</span> +<span class='doccomment'>/// canonical format is defined by the following invariants:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// 1. Given any Unicode scalar value, it is matched by *at most* one character</span> +<span class='doccomment'>/// range in a canonical character class.</span> +<span class='doccomment'>/// 2. Every adjacent character range is separated by at least one Unicode</span> +<span class='doccomment'>/// scalar value.</span> +<span class='doccomment'>/// 3. Given any pair of character ranges `r1` and `r2`, if</span> +<span class='doccomment'>/// `r1.end < r2.start`, then `r1` comes before `r2` in a canonical</span> +<span class='doccomment'>/// character class.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// In sum, any `CharClass` produced by this crate's parser is a sorted</span> +<span class='doccomment'>/// sequence of non-overlapping ranges. This makes it possible to test whether</span> +<span class='doccomment'>/// a character is matched by a class with a binary search.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Additionally, a character class may be marked *case insensitive*. If it's</span> +<span class='doccomment'>/// case insensitive, then:</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// 1. Simple case folding has been applied to all ranges.</span> +<span class='doccomment'>/// 2. Simple case folding must be applied to a character before testing</span> +<span class='doccomment'>/// whether it matches the character class.</span> +<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>CharClass</span> { + <span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span>, + <span class='ident'>casei</span>: <span class='ident'>bool</span>, +} + +<span class='doccomment'>/// A single inclusive range in a character class.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Since range boundaries are defined by Unicode scalar values, the boundaries</span> +<span class='doccomment'>/// can never be in the open interval `(0xD7FF, 0xE000)`. However, a range may</span> +<span class='doccomment'>/// *cover* codepoints that are not scalar values.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// Note that this has a few convenient impls on `PartialEq` and `PartialOrd`</span> +<span class='doccomment'>/// for testing whether a character is contained inside a given range.</span> +<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>, <span class='ident'>PartialOrd</span>, <span class='ident'>Eq</span>, <span class='ident'>Ord</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ClassRange</span> { + <span class='doccomment'>/// The start character of the range.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This must be less than or equal to `end`.</span> + <span class='kw'>pub</span> <span class='ident'>start</span>: <span class='ident'>char</span>, + + <span class='doccomment'>/// The end character of the range.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This must be greater than or equal to `end`.</span> + <span class='kw'>pub</span> <span class='ident'>end</span>: <span class='ident'>char</span>, +} + +<span class='kw'>impl</span> <span class='ident'>Expr</span> { + <span class='doccomment'>/// Parses a string in a regular expression syntax tree.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parse</span>(<span class='ident'>s</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Expr</span><span class='op'>></span> { + <span class='ident'>parser</span>::<span class='ident'>Parser</span>::<span class='ident'>parse</span>(<span class='ident'>s</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>()) + } + + <span class='doccomment'>/// Returns true iff the expression can be repeated by a quantifier.</span> + <span class='kw'>fn</span> <span class='ident'>can_repeat</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> { + <span class='ident'>Literal</span>{..} + <span class='op'>|</span> <span class='ident'>AnyChar</span> + <span class='op'>|</span> <span class='ident'>AnyCharNoNL</span> + <span class='op'>|</span> <span class='ident'>Class</span>(_) + <span class='op'>|</span> <span class='ident'>StartLine</span> <span class='op'>|</span> <span class='ident'>EndLine</span> <span class='op'>|</span> <span class='ident'>StartText</span> <span class='op'>|</span> <span class='ident'>EndText</span> + <span class='op'>|</span> <span class='ident'>WordBoundary</span> <span class='op'>|</span> <span class='ident'>NotWordBoundary</span> + <span class='op'>|</span> <span class='ident'>Group</span>{..} + <span class='op'>=></span> <span class='boolval'>true</span>, + _ <span class='op'>=></span> <span class='boolval'>false</span>, + } + } + + <span class='kw'>fn</span> <span class='ident'>simplify</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Expr</span> { + <span class='kw'>fn</span> <span class='ident'>combine_literals</span>(<span class='ident'>es</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Expr</span><span class='op'>></span>, <span class='ident'>e</span>: <span class='ident'>Expr</span>) { + <span class='kw'>match</span> (<span class='ident'>es</span>.<span class='ident'>pop</span>(), <span class='ident'>e</span>) { + (<span class='prelude-val'>None</span>, <span class='ident'>e</span>) <span class='op'>=></span> <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e</span>), + (<span class='prelude-val'>Some</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='kw-2'>mut</span> <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> }), + <span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> }) <span class='op'>=></span> { + <span class='kw'>if</span> <span class='ident'>casei1</span> <span class='op'>==</span> <span class='ident'>casei2</span> { + <span class='ident'>chars1</span>.<span class='ident'>extend</span>(<span class='ident'>chars2</span>); + <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> }); + } <span class='kw'>else</span> { + <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars1</span>, <span class='ident'>casei</span>: <span class='ident'>casei1</span> }); + <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>Literal</span> { <span class='ident'>chars</span>: <span class='ident'>chars2</span>, <span class='ident'>casei</span>: <span class='ident'>casei2</span> }); + } + } + (<span class='prelude-val'>Some</span>(<span class='ident'>e1</span>), <span class='ident'>e2</span>) <span class='op'>=></span> { + <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e1</span>); + <span class='ident'>es</span>.<span class='ident'>push</span>(<span class='ident'>e2</span>); + } + } + } + <span class='kw'>match</span> <span class='self'>self</span> { + <span class='ident'>Repeat</span> { <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=></span> <span class='ident'>Repeat</span> { + <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>.<span class='ident'>simplify</span>()), + <span class='ident'>r</span>: <span class='ident'>r</span>, + <span class='ident'>greedy</span>: <span class='ident'>greedy</span>, + }, + <span class='ident'>Group</span> { <span class='ident'>e</span>, <span class='ident'>i</span>, <span class='ident'>name</span> } <span class='op'>=></span> { + <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>(); + <span class='kw'>if</span> <span class='ident'>i</span>.<span class='ident'>is_none</span>() <span class='op'>&&</span> <span class='ident'>name</span>.<span class='ident'>is_none</span>() <span class='op'>&&</span> <span class='ident'>e</span>.<span class='ident'>can_repeat</span>() { + <span class='ident'>e</span> + } <span class='kw'>else</span> { + <span class='ident'>Group</span> { <span class='ident'>e</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>e</span>), <span class='ident'>i</span>: <span class='ident'>i</span>, <span class='ident'>name</span>: <span class='ident'>name</span> } + } + } + <span class='ident'>Concat</span>(<span class='ident'>es</span>) <span class='op'>=></span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_es</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>es</span>.<span class='ident'>len</span>()); + <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> { + <span class='ident'>combine_literals</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>new_es</span>, <span class='ident'>e</span>.<span class='ident'>simplify</span>()); + } + <span class='kw'>if</span> <span class='ident'>new_es</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>1</span> { + <span class='ident'>new_es</span>.<span class='ident'>pop</span>().<span class='ident'>unwrap</span>() + } <span class='kw'>else</span> { + <span class='ident'>Concat</span>(<span class='ident'>new_es</span>) + } + } + <span class='ident'>Alternate</span>(<span class='ident'>es</span>) <span class='op'>=></span> <span class='ident'>Alternate</span>(<span class='ident'>es</span>.<span class='ident'>into_iter</span>() + .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span>.<span class='ident'>simplify</span>()) + .<span class='ident'>collect</span>()), + <span class='ident'>e</span> <span class='op'>=></span> <span class='ident'>e</span>, + } + } +} + +<span class='kw'>impl</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> { + <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span>; + <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>Vec</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span> { <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>ranges</span> } +} + +<span class='kw'>impl</span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> { + <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>ClassRange</span>; + <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span>; + <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>vec</span>::<span class='ident'>IntoIter</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span> { <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>into_iter</span>() } +} + +<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>IntoIterator</span> <span class='kw'>for</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>CharClass</span> { + <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>ClassRange</span>; + <span class='kw'>type</span> <span class='ident'>IntoIter</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>ClassRange</span><span class='op'>></span>; + <span class='kw'>fn</span> <span class='ident'>into_iter</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>slice</span>::<span class='ident'>Iter</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>ClassRange</span><span class='op'>></span> { <span class='self'>self</span>.<span class='ident'>iter</span>() } +} + +<span class='kw'>impl</span> <span class='ident'>CharClass</span> { + <span class='doccomment'>/// Create a new class from an existing set of ranges.</span> + <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>ranges</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>ranges</span>, <span class='ident'>casei</span>: <span class='boolval'>false</span> } + } + + <span class='doccomment'>/// Create an empty class.</span> + <span class='kw'>fn</span> <span class='ident'>empty</span>() <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>Vec</span>::<span class='ident'>new</span>()) + } + + <span class='doccomment'>/// Returns true if `c` is matched by this character class.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// If this character class is case insensitive, then simple case folding</span> + <span class='doccomment'>/// is applied to `c` before checking for a match.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>matches</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='kw-2'>mut</span> <span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_case_insensitive</span>() { + <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>) + } + <span class='self'>self</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='ident'>range</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>partial_cmp</span>(<span class='ident'>range</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>() + } + + <span class='doccomment'>/// Returns true if this character class should be matched case</span> + <span class='doccomment'>/// insensitively.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// When `true`, simple case folding has already been applied to the</span> + <span class='doccomment'>/// class.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_case_insensitive</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='self'>self</span>.<span class='ident'>casei</span> + } + + <span class='doccomment'>/// Create a new empty class from this one.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Namely, its capacity and case insensitive setting will be the same.</span> + <span class='kw'>fn</span> <span class='ident'>to_empty</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='ident'>CharClass</span> { <span class='ident'>ranges</span>: <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='self'>self</span>.<span class='ident'>len</span>()), <span class='ident'>casei</span>: <span class='self'>self</span>.<span class='ident'>casei</span> } + } + + <span class='doccomment'>/// Merge two classes and canonicalize them.</span> + <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> + <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>CharClass</span>) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>other</span>); + <span class='self'>self</span>.<span class='ident'>canonicalize</span>() + } + + <span class='doccomment'>/// Canonicalze any sequence of ranges.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This is responsible for enforcing the canonical format invariants</span> + <span class='doccomment'>/// as described on the docs for the `CharClass` type.</span> + <span class='kw'>fn</span> <span class='ident'>canonicalize</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='comment'>// TODO: Save some cycles here by checking if already canonicalized.</span> + <span class='self'>self</span>.<span class='ident'>ranges</span>.<span class='ident'>sort</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ordered</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>(); <span class='comment'>// TODO: Do this in place?</span> + <span class='kw'>for</span> <span class='ident'>candidate</span> <span class='kw'>in</span> <span class='self'>self</span> { + <span class='comment'>// If the candidate overlaps with an existing range, then it must</span> + <span class='comment'>// be the most recent range added because we process the candidates</span> + <span class='comment'>// in order.</span> + <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>or</span>) <span class='op'>=</span> <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>last_mut</span>() { + <span class='kw'>if</span> <span class='ident'>or</span>.<span class='ident'>overlapping</span>(<span class='ident'>candidate</span>) { + <span class='op'>*</span><span class='ident'>or</span> <span class='op'>=</span> <span class='ident'>or</span>.<span class='ident'>merge</span>(<span class='ident'>candidate</span>); + <span class='kw'>continue</span>; + } + } + <span class='ident'>ordered</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>candidate</span>); + } + <span class='ident'>ordered</span> + } + + <span class='doccomment'>/// Negates the character class.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// For all `c` where `c` is a Unicode scalar value, `c` matches `self`</span> + <span class='doccomment'>/// if and only if `c` does not match `self.negate()`.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Note that this cannot be called on a character class that has had</span> + <span class='doccomment'>/// case folding applied to it. (Because case folding turns on a flag</span> + <span class='doccomment'>/// and doesn't store every possible matching character. Therefore,</span> + <span class='doccomment'>/// its negation is tricky to get right. Turns out, we don't need it</span> + <span class='doccomment'>/// anyway!)</span> + <span class='kw'>fn</span> <span class='ident'>negate</span>(<span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='kw'>fn</span> <span class='ident'>range</span>(<span class='ident'>s</span>: <span class='ident'>char</span>, <span class='ident'>e</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>ClassRange</span> { <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>s</span>, <span class='ident'>e</span>) } + + <span class='comment'>// Never allow negating of a class that has been case folded!</span> + <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='self'>self</span>.<span class='ident'>casei</span>); + + <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>is_empty</span>() { <span class='kw'>return</span> <span class='self'>self</span>; } + <span class='self'>self</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>canonicalize</span>(); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inv</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>(); + <span class='kw'>if</span> <span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span> <span class='op'>></span> <span class='string'>'\x00'</span> { + <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='string'>'\x00'</span>, <span class='ident'>dec_char</span>(<span class='self'>self</span>[<span class='number'>0</span>].<span class='ident'>start</span>))); + } + <span class='kw'>for</span> <span class='ident'>win</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>windows</span>(<span class='number'>2</span>) { + <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='ident'>win</span>[<span class='number'>0</span>].<span class='ident'>end</span>), + <span class='ident'>dec_char</span>(<span class='ident'>win</span>[<span class='number'>1</span>].<span class='ident'>start</span>))); + } + <span class='kw'>if</span> <span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span> <span class='op'><</span> <span class='ident'>char</span>::<span class='ident'>MAX</span> { + <span class='ident'>inv</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>range</span>(<span class='ident'>inc_char</span>(<span class='self'>self</span>[<span class='self'>self</span>.<span class='ident'>len</span>() <span class='op'>-</span> <span class='number'>1</span>].<span class='ident'>end</span>), + <span class='ident'>char</span>::<span class='ident'>MAX</span>)); + } + <span class='ident'>inv</span> + } + + <span class='doccomment'>/// Apply case folding to this character class.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// One a class had been case folded, it cannot be negated.</span> + <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>folded</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>to_empty</span>(); + <span class='ident'>folded</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>; + <span class='kw'>for</span> <span class='ident'>r</span> <span class='kw'>in</span> <span class='self'>self</span> { + <span class='comment'>// Applying case folding to a range is expensive because *every*</span> + <span class='comment'>// character needed to be examined. Thus, we avoid that drudgery</span> + <span class='comment'>// if no character in the current range is in our case folding</span> + <span class='comment'>// table.</span> + <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>needs_case_folding</span>() { + <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>extend</span>(<span class='ident'>r</span>.<span class='ident'>case_fold</span>()); + } <span class='kw'>else</span> { + <span class='ident'>folded</span>.<span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>r</span>); + } + } + <span class='ident'>folded</span>.<span class='ident'>canonicalize</span>() + } +} + +<span class='kw'>impl</span> <span class='ident'>ClassRange</span> { + <span class='doccomment'>/// Create a new class range.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// If `end < start`, then the two values are swapped so that</span> + <span class='doccomment'>/// the invariant `start <= end` is preserved.</span> + <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>start</span>: <span class='ident'>char</span>, <span class='ident'>end</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>ClassRange</span> { + <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'><=</span> <span class='ident'>end</span> { + <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>start</span>, <span class='ident'>end</span>: <span class='ident'>end</span> } + } <span class='kw'>else</span> { + <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>end</span>, <span class='ident'>end</span>: <span class='ident'>start</span> } + } + } + + <span class='doccomment'>/// Create a range of one character.</span> + <span class='kw'>fn</span> <span class='ident'>one</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>ClassRange</span> { + <span class='ident'>ClassRange</span> { <span class='ident'>start</span>: <span class='ident'>c</span>, <span class='ident'>end</span>: <span class='ident'>c</span> } + } + + <span class='doccomment'>/// Returns true if and only if the two ranges are overlapping. Note that</span> + <span class='doccomment'>/// since ranges are inclusive, `a-c` and `d-f` are overlapping!</span> + <span class='kw'>fn</span> <span class='ident'>overlapping</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>) <span class='op'><=</span> <span class='ident'>inc_char</span>(<span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>)) + } + + <span class='doccomment'>/// Creates a new range representing the union of `self` and `other.</span> + <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>ClassRange</span>) <span class='op'>-></span> <span class='ident'>ClassRange</span> { + <span class='ident'>ClassRange</span> { + <span class='ident'>start</span>: <span class='ident'>min</span>(<span class='self'>self</span>.<span class='ident'>start</span>, <span class='ident'>other</span>.<span class='ident'>start</span>), + <span class='ident'>end</span>: <span class='ident'>max</span>(<span class='self'>self</span>.<span class='ident'>end</span>, <span class='ident'>other</span>.<span class='ident'>end</span>), + } + } + + <span class='doccomment'>/// Returns true if and only if this range contains a character that is</span> + <span class='doccomment'>/// in the case folding table.</span> + <span class='kw'>fn</span> <span class='ident'>needs_case_folding</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span> + .<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&</span>(<span class='ident'>c</span>, _)<span class='op'>|</span> <span class='self'>self</span>.<span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='ident'>c</span>).<span class='ident'>unwrap</span>()).<span class='ident'>is_ok</span>() + } + + <span class='doccomment'>/// Apply case folding to this range.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// Since case folding might add characters such that the range is no</span> + <span class='doccomment'>/// longer contiguous, this returns multiple class ranges. They are in</span> + <span class='doccomment'>/// canonical order.</span> + <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span> { + <span class='kw'>let</span> (<span class='ident'>s</span>, <span class='ident'>e</span>) <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>start</span> <span class='kw'>as</span> <span class='ident'>u32</span>, <span class='self'>self</span>.<span class='ident'>end</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>simple_case_fold</span>(<span class='self'>self</span>.<span class='ident'>start</span>); + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>start</span>; + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>start</span>; + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='number'>100</span>); + <span class='kw'>for</span> <span class='kw-2'>mut</span> <span class='ident'>c</span> <span class='kw'>in</span> (<span class='ident'>s</span><span class='op'>+</span><span class='number'>1</span>..<span class='ident'>e</span>).<span class='ident'>filter_map</span>(<span class='ident'>char</span>::<span class='ident'>from_u32</span>) { + <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>>=</span> <span class='ident'>next_case_fold</span> { + <span class='ident'>c</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>) { + <span class='prelude-val'>Ok</span>(<span class='ident'>i</span>) <span class='op'>=></span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>, + <span class='prelude-val'>Err</span>(<span class='ident'>i</span>) <span class='op'>=></span> { + <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'><</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>len</span>() { + <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>0</span>; + } <span class='kw'>else</span> { + <span class='ident'>next_case_fold</span> <span class='op'>=</span> <span class='string'>'\u{10FFFF}'</span> + } + <span class='ident'>c</span> + } + }; + } + <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>!=</span> <span class='ident'>inc_char</span>(<span class='ident'>end</span>) { + <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>)); + <span class='ident'>start</span> <span class='op'>=</span> <span class='ident'>c</span>; + } + <span class='ident'>end</span> <span class='op'>=</span> <span class='ident'>c</span>; + } + <span class='ident'>ranges</span>.<span class='ident'>push</span>(<span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>start</span>, <span class='ident'>end</span>)); + <span class='ident'>ranges</span> + } +} + +<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'><</span><span class='ident'>char</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> { + <span class='attribute'>#[<span class='ident'>inline</span>]</span> + <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='self'>self</span>.<span class='ident'>start</span> <span class='op'><=</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>&&</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'><=</span> <span class='self'>self</span>.<span class='ident'>end</span> + } +} + +<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>char</span> { + <span class='attribute'>#[<span class='ident'>inline</span>]</span> + <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>ClassRange</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='ident'>other</span>.<span class='ident'>eq</span>(<span class='self'>self</span>) + } +} + +<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'><</span><span class='ident'>char</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> { + <span class='attribute'>#[<span class='ident'>inline</span>]</span> + <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>char</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Ordering</span><span class='op'>></span> { + <span class='prelude-val'>Some</span>(<span class='kw'>if</span> <span class='self'>self</span> <span class='op'>==</span> <span class='ident'>other</span> { + <span class='ident'>Ordering</span>::<span class='ident'>Equal</span> + } <span class='kw'>else</span> <span class='kw'>if</span> <span class='op'>*</span><span class='ident'>other</span> <span class='op'>></span> <span class='self'>self</span>.<span class='ident'>end</span> { + <span class='ident'>Ordering</span>::<span class='ident'>Greater</span> + } <span class='kw'>else</span> { + <span class='ident'>Ordering</span>::<span class='ident'>Less</span> + }) + } +} + +<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'><</span><span class='ident'>ClassRange</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>char</span> { + <span class='attribute'>#[<span class='ident'>inline</span>]</span> + <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>ClassRange</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Ordering</span><span class='op'>></span> { + <span class='ident'>other</span>.<span class='ident'>partial_cmp</span>(<span class='self'>self</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>o</span><span class='op'>|</span> <span class='ident'>o</span>.<span class='ident'>reverse</span>()) + } +} + +<span class='doccomment'>/// This implementation of `Display` will write a regular expression from the</span> +<span class='doccomment'>/// syntax tree. It does not write the original string parsed.</span> +<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Expr</span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> { + <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> { + <span class='ident'>Empty</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>""</span>), + <span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, <span class='ident'>casei</span> } <span class='op'>=></span> { + <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?i:"</span>)); } + <span class='kw'>for</span> <span class='kw-2'>&</span><span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>chars</span> { + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}"</span>, <span class='ident'>quote_char</span>(<span class='ident'>c</span>))); + } + <span class='kw'>if</span> <span class='ident'>casei</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>")"</span>)); } + <span class='prelude-val'>Ok</span>(()) + } + <span class='ident'>AnyChar</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?s:.)"</span>), + <span class='ident'>AnyCharNoNL</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"."</span>), + <span class='ident'>Class</span>(<span class='kw-2'>ref</span> <span class='ident'>cls</span>) <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}"</span>, <span class='ident'>cls</span>), + <span class='ident'>StartLine</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?m:^)"</span>), + <span class='ident'>EndLine</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?m:$)"</span>), + <span class='ident'>StartText</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r"^"</span>), + <span class='ident'>EndText</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r"$"</span>), + <span class='ident'>WordBoundary</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r"\b"</span>), + <span class='ident'>NotWordBoundary</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>r"\B"</span>), + <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>i</span>: <span class='prelude-val'>None</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span> } <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?:{})"</span>, <span class='ident'>e</span>), + <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>None</span>, .. } <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"({})"</span>, <span class='ident'>e</span>), + <span class='ident'>Group</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>name</span>: <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>), .. } <span class='op'>=></span> { + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?P<{}>{})"</span>, <span class='ident'>n</span>, <span class='ident'>e</span>) + } + <span class='ident'>Repeat</span> { <span class='kw-2'>ref</span> <span class='ident'>e</span>, <span class='ident'>r</span>, <span class='ident'>greedy</span> } <span class='op'>=></span> { + <span class='kw'>match</span> <span class='kw-2'>&</span><span class='op'>*</span><span class='op'>*</span><span class='ident'>e</span> { + <span class='kw-2'>&</span><span class='ident'>Literal</span> { <span class='kw-2'>ref</span> <span class='ident'>chars</span>, .. } <span class='kw'>if</span> <span class='ident'>chars</span>.<span class='ident'>len</span>() <span class='op'>></span> <span class='number'>1</span> <span class='op'>=></span> { + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?:{}){}"</span>, <span class='ident'>e</span>, <span class='ident'>r</span>)) + } + _ <span class='op'>=></span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}{}"</span>, <span class='ident'>e</span>, <span class='ident'>r</span>)), + } + <span class='kw'>if</span> <span class='op'>!</span><span class='ident'>greedy</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"?"</span>)); } + <span class='prelude-val'>Ok</span>(()) + } + <span class='ident'>Concat</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=></span> { + <span class='kw'>for</span> <span class='ident'>e</span> <span class='kw'>in</span> <span class='ident'>es</span> { + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}"</span>, <span class='ident'>e</span>)); + } + <span class='prelude-val'>Ok</span>(()) + } + <span class='ident'>Alternate</span>(<span class='kw-2'>ref</span> <span class='ident'>es</span>) <span class='op'>=></span> { + <span class='kw'>for</span> (<span class='ident'>i</span>, <span class='ident'>e</span>) <span class='kw'>in</span> <span class='ident'>es</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() { + <span class='kw'>if</span> <span class='ident'>i</span> <span class='op'>></span> <span class='number'>0</span> { <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"|"</span>)); } + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}"</span>, <span class='ident'>e</span>)); + } + <span class='prelude-val'>Ok</span>(()) + } + } + } +} + +<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Repeater</span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> { + <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> { + <span class='ident'>ZeroOrOne</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"?"</span>), + <span class='ident'>ZeroOrMore</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"*"</span>), + <span class='ident'>OneOrMore</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"+"</span>), + <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>None</span> } <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{{{},}}"</span>, <span class='ident'>s</span>), + <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='kw'>if</span> <span class='ident'>s</span> <span class='op'>==</span> <span class='ident'>e</span> <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{{{}}}"</span>, <span class='ident'>s</span>), + <span class='ident'>Range</span> { <span class='ident'>min</span>: <span class='ident'>s</span>, <span class='ident'>max</span>: <span class='prelude-val'>Some</span>(<span class='ident'>e</span>) } <span class='op'>=></span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{{{}, {}}}"</span>, <span class='ident'>s</span>, <span class='ident'>e</span>), + } + } +} + +<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>CharClass</span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> { + <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> { + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"(?i:"</span>)); + } + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"["</span>)); + <span class='kw'>for</span> <span class='ident'>range</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>iter</span>() { + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}"</span>, <span class='ident'>range</span>)); + } + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"]"</span>)); + <span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>casei</span> { + <span class='macro'>try</span><span class='macro'>!</span>(<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>")"</span>)); + } + <span class='prelude-val'>Ok</span>(()) + } +} + +<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ClassRange</span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> { + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"{}-{}"</span>, <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>start</span>), <span class='ident'>quote_char</span>(<span class='self'>self</span>.<span class='ident'>end</span>)) + } +} + +<span class='doccomment'>/// An alias for computations that can return a `Error`.</span> +<span class='kw'>pub</span> <span class='kw'>type</span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span> <span class='op'>=</span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>T</span>, <span class='ident'>Error</span><span class='op'>></span>; + +<span class='doccomment'>/// A parse error.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// This includes details about the specific type of error and a rough</span> +<span class='doccomment'>/// approximation of where it occurred.</span> +<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Error</span> { + <span class='ident'>pos</span>: <span class='ident'>usize</span>, + <span class='ident'>surround</span>: <span class='ident'>String</span>, + <span class='ident'>kind</span>: <span class='ident'>ErrorKind</span>, +} + +<span class='doccomment'>/// The specific type of parse error that can occur.</span> +<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>PartialEq</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>ErrorKind</span> { + <span class='doccomment'>/// A negation symbol is used twice in flag settings.</span> + <span class='doccomment'>/// e.g., `(?-i-s)`.</span> + <span class='ident'>DoubleFlagNegation</span>, + <span class='doccomment'>/// The same capture name was used more than once.</span> + <span class='doccomment'>/// e.g., `(?P<a>.)(?P<a>.)`.</span> + <span class='ident'>DuplicateCaptureName</span>(<span class='ident'>String</span>), + <span class='doccomment'>/// An alternate is empty. e.g., `(|a)`.</span> + <span class='ident'>EmptyAlternate</span>, + <span class='doccomment'>/// A capture group name is empty. e.g., `(?P<>a)`.</span> + <span class='ident'>EmptyCaptureName</span>, + <span class='doccomment'>/// A negation symbol was not proceded by any flags. e.g., `(?i-)`.</span> + <span class='ident'>EmptyFlagNegation</span>, + <span class='doccomment'>/// A group is empty. e.g., `()`.</span> + <span class='ident'>EmptyGroup</span>, + <span class='doccomment'>/// An invalid number was used in a counted repetition. e.g., `a{b}`.</span> + <span class='ident'>InvalidBase10</span>(<span class='ident'>String</span>), + <span class='doccomment'>/// An invalid hexadecimal number was used in an escape sequence.</span> + <span class='doccomment'>/// e.g., `\xAG`.</span> + <span class='ident'>InvalidBase16</span>(<span class='ident'>String</span>), + <span class='doccomment'>/// An invalid capture name was used. e.g., `(?P<0a>b)`.</span> + <span class='ident'>InvalidCaptureName</span>(<span class='ident'>String</span>), + <span class='doccomment'>/// An invalid class range was givien. Specifically, when the start of the</span> + <span class='doccomment'>/// range is greater than the end. e.g., `[z-a]`.</span> + <span class='ident'>InvalidClassRange</span> { + <span class='doccomment'>/// The first character specified in the range.</span> + <span class='ident'>start</span>: <span class='ident'>char</span>, + <span class='doccomment'>/// The second character specified in the range.</span> + <span class='ident'>end</span>: <span class='ident'>char</span>, + }, + <span class='doccomment'>/// An escape sequence was used in a character class where it is not</span> + <span class='doccomment'>/// allowed. e.g., `[a-\pN]` or `[\A]`.</span> + <span class='ident'>InvalidClassEscape</span>(<span class='ident'>Expr</span>), + <span class='doccomment'>/// An invalid counted repetition min/max was given. e.g., `a{2,1}`.</span> + <span class='ident'>InvalidRepeatRange</span> { + <span class='doccomment'>/// The first number specified in the repetition.</span> + <span class='ident'>min</span>: <span class='ident'>u32</span>, + <span class='doccomment'>/// The second number specified in the repetition.</span> + <span class='ident'>max</span>: <span class='ident'>u32</span>, + }, + <span class='doccomment'>/// An invalid Unicode scalar value was used in a long hexadecimal</span> + <span class='doccomment'>/// sequence. e.g., `\x{D800}`.</span> + <span class='ident'>InvalidScalarValue</span>(<span class='ident'>u32</span>), + <span class='doccomment'>/// An empty counted repetition operator. e.g., `a{}`.</span> + <span class='ident'>MissingBase10</span>, + <span class='doccomment'>/// A repetition operator was not applied to an expression. e.g., `*`.</span> + <span class='ident'>RepeaterExpectsExpr</span>, + <span class='doccomment'>/// A repetition operator was applied to an expression that cannot be</span> + <span class='doccomment'>/// repeated. e.g., `a+*` or `a|*`.</span> + <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='ident'>Expr</span>), + <span class='doccomment'>/// A capture group name that is never closed. e.g., `(?P<a`.</span> + <span class='ident'>UnclosedCaptureName</span>(<span class='ident'>String</span>), + <span class='doccomment'>/// An unclosed hexadecimal literal. e.g., `\x{a`.</span> + <span class='ident'>UnclosedHex</span>, + <span class='doccomment'>/// An unclosed parenthesis. e.g., `(a`.</span> + <span class='ident'>UnclosedParen</span>, + <span class='doccomment'>/// An unclosed counted repetition operator. e.g., `a{2`.</span> + <span class='ident'>UnclosedRepeat</span>, + <span class='doccomment'>/// An unclosed named Unicode class. e.g., `\p{Yi`.</span> + <span class='ident'>UnclosedUnicodeName</span>, + <span class='doccomment'>/// Saw end of regex before class was closed. e.g., `[a`.</span> + <span class='ident'>UnexpectedClassEof</span>, + <span class='doccomment'>/// Saw end of regex before escape sequence was closed. e.g., `\`.</span> + <span class='ident'>UnexpectedEscapeEof</span>, + <span class='doccomment'>/// Saw end of regex before flags were closed. e.g., `(?i`.</span> + <span class='ident'>UnexpectedFlagEof</span>, + <span class='doccomment'>/// Saw end of regex before two hexadecimal digits were seen. e.g., `\xA`.</span> + <span class='ident'>UnexpectedTwoDigitHexEof</span>, + <span class='doccomment'>/// Unopened parenthesis. e.g., `)`.</span> + <span class='ident'>UnopenedParen</span>, + <span class='doccomment'>/// Unrecognized escape sequence. e.g., `\q`.</span> + <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>char</span>), + <span class='doccomment'>/// Unrecognized flag. e.g., `(?a)`.</span> + <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>char</span>), + <span class='doccomment'>/// Unrecognized named Unicode class. e.g., `\p{Foo}`.</span> + <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='ident'>String</span>), + <span class='doccomment'>/// Hints that destructuring should not be exhaustive.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// This enum may grow additional variants, so this makes sure clients</span> + <span class='doccomment'>/// don't count on exhaustive matching. (Otherwise, adding a new variant</span> + <span class='doccomment'>/// could break existing code.)</span> + <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span> + <span class='ident'>__Nonexhaustive</span>, +} + +<span class='kw'>impl</span> <span class='ident'>Error</span> { + <span class='doccomment'>/// Returns an approximate *character* offset at which the error occurred.</span> + <span class='doccomment'>///</span> + <span class='doccomment'>/// The character offset may be equal to the number of characters in the</span> + <span class='doccomment'>/// string, in which case it should be interpreted as pointing to the end</span> + <span class='doccomment'>/// of the regex.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>position</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>usize</span> { + <span class='self'>self</span>.<span class='ident'>pos</span> + } + + <span class='doccomment'>/// Returns the type of the regex parse error.</span> + <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>kind</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>ErrorKind</span> { + <span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>kind</span> + } +} + +<span class='kw'>impl</span> <span class='ident'>ErrorKind</span> { + <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> { + <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>; + <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> { + <span class='ident'>DoubleFlagNegation</span> <span class='op'>=></span> <span class='string'>"double flag negation"</span>, + <span class='ident'>DuplicateCaptureName</span>(_) <span class='op'>=></span> <span class='string'>"duplicate capture name"</span>, + <span class='ident'>EmptyAlternate</span> <span class='op'>=></span> <span class='string'>"empty alternate"</span>, + <span class='ident'>EmptyCaptureName</span> <span class='op'>=></span> <span class='string'>"empty capture name"</span>, + <span class='ident'>EmptyFlagNegation</span> <span class='op'>=></span> <span class='string'>"flag negation without any flags"</span>, + <span class='ident'>EmptyGroup</span> <span class='op'>=></span> <span class='string'>"empty group (e.g., '()')"</span>, + <span class='ident'>InvalidBase10</span>(_) <span class='op'>=></span> <span class='string'>"invalid base 10 number"</span>, + <span class='ident'>InvalidBase16</span>(_) <span class='op'>=></span> <span class='string'>"invalid base 16 number"</span>, + <span class='ident'>InvalidCaptureName</span>(_) <span class='op'>=></span> <span class='string'>"invalid capture name"</span>, + <span class='ident'>InvalidClassRange</span>{..} <span class='op'>=></span> <span class='string'>"invalid character class range"</span>, + <span class='ident'>InvalidClassEscape</span>(_) <span class='op'>=></span> <span class='string'>"invalid escape sequence in class"</span>, + <span class='ident'>InvalidRepeatRange</span>{..} <span class='op'>=></span> <span class='string'>"invalid counted repetition range"</span>, + <span class='ident'>InvalidScalarValue</span>(_) <span class='op'>=></span> <span class='string'>"invalid Unicode scalar value"</span>, + <span class='ident'>MissingBase10</span> <span class='op'>=></span> <span class='string'>"missing count in repetition operator"</span>, + <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=></span> <span class='string'>"repetition operator missing expression"</span>, + <span class='ident'>RepeaterUnexpectedExpr</span>(_) <span class='op'>=></span> <span class='string'>"expression cannot be repeated"</span>, + <span class='ident'>UnclosedCaptureName</span>(_) <span class='op'>=></span> <span class='string'>"unclosed capture group name"</span>, + <span class='ident'>UnclosedHex</span> <span class='op'>=></span> <span class='string'>"unclosed hexadecimal literal"</span>, + <span class='ident'>UnclosedParen</span> <span class='op'>=></span> <span class='string'>"unclosed parenthesis"</span>, + <span class='ident'>UnclosedRepeat</span> <span class='op'>=></span> <span class='string'>"unclosed counted repetition operator"</span>, + <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=></span> <span class='string'>"unclosed Unicode class literal"</span>, + <span class='ident'>UnexpectedClassEof</span> <span class='op'>=></span> <span class='string'>"unexpected EOF in character class"</span>, + <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=></span> <span class='string'>"unexpected EOF in escape sequence"</span>, + <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=></span> <span class='string'>"unexpected EOF in flags"</span>, + <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=></span> <span class='string'>"unexpected EOF in hex literal"</span>, + <span class='ident'>UnopenedParen</span> <span class='op'>=></span> <span class='string'>"unopened parenthesis"</span>, + <span class='ident'>UnrecognizedEscape</span>(_) <span class='op'>=></span> <span class='string'>"unrecognized escape sequence"</span>, + <span class='ident'>UnrecognizedFlag</span>(_) <span class='op'>=></span> <span class='string'>"unrecognized flag"</span>, + <span class='ident'>UnrecognizedUnicodeClass</span>(_) <span class='op'>=></span> <span class='string'>"unrecognized Unicode class name"</span>, + <span class='ident'>__Nonexhaustive</span> <span class='op'>=></span> <span class='macro'>unreachable</span><span class='macro'>!</span>(), + } + } +} + +<span class='kw'>impl</span> ::<span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>Error</span> { + <span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> { + <span class='self'>self</span>.<span class='ident'>kind</span>.<span class='ident'>description</span>() + } +} + +<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Error</span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> { + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Error parsing regex near '{}' at character offset {}: {}"</span>, + <span class='self'>self</span>.<span class='ident'>surround</span>, <span class='self'>self</span>.<span class='ident'>pos</span>, <span class='self'>self</span>.<span class='ident'>kind</span>) + } +} + +<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>ErrorKind</span> { + <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> { + <span class='kw'>use</span> <span class='ident'>ErrorKind</span>::<span class='op'>*</span>; + <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> { + <span class='ident'>DoubleFlagNegation</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Only one negation symbol is allowed in flags."</span>), + <span class='ident'>DuplicateCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Capture name '{}' is used more than once."</span>, <span class='ident'>s</span>), + <span class='ident'>EmptyAlternate</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Alternations cannot be empty."</span>), + <span class='ident'>EmptyCaptureName</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Capture names cannot be empty."</span>), + <span class='ident'>EmptyFlagNegation</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Flag negation requires setting at least one flag."</span>), + <span class='ident'>EmptyGroup</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Empty regex groups (e.g., '()') are not allowed."</span>), + <span class='ident'>InvalidBase10</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Not a valid base 10 number: '{}'"</span>, <span class='ident'>s</span>), + <span class='ident'>InvalidBase16</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Not a valid base 16 number: '{}'"</span>, <span class='ident'>s</span>), + <span class='ident'>InvalidCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Invalid capture name: '{}'. Capture names must \ + consist of [_a-zA-Z0-9] and are not allowed to \ + start with with a number."</span>, <span class='ident'>s</span>), + <span class='ident'>InvalidClassRange</span> { <span class='ident'>start</span>, <span class='ident'>end</span> } <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Invalid character class range '{}-{}'. \ + Character class ranges must start with the smaller \ + character, but {} > {}"</span>, <span class='ident'>start</span>, <span class='ident'>end</span>, <span class='ident'>start</span>, <span class='ident'>end</span>), + <span class='ident'>InvalidClassEscape</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Invalid escape sequence in character \ + class: '{}'."</span>, <span class='ident'>e</span>), + <span class='ident'>InvalidRepeatRange</span> { <span class='ident'>min</span>, <span class='ident'>max</span> } <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Invalid counted repetition range: {{{}, {}}}. \ + Counted repetition ranges must start with the \ + minimum, but {} > {}"</span>, <span class='ident'>min</span>, <span class='ident'>max</span>, <span class='ident'>min</span>, <span class='ident'>max</span>), + <span class='ident'>InvalidScalarValue</span>(<span class='ident'>c</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Number does not correspond to a Unicode scalar \ + value: '{}'."</span>, <span class='ident'>c</span>), + <span class='ident'>MissingBase10</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Missing maximum in counted reptition operator."</span>), + <span class='ident'>RepeaterExpectsExpr</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Missing expression for reptition operator."</span>), + <span class='ident'>RepeaterUnexpectedExpr</span>(<span class='kw-2'>ref</span> <span class='ident'>e</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Invalid application of reptition operator to: \ + '{}'."</span>, <span class='ident'>e</span>), + <span class='ident'>UnclosedCaptureName</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Capture name group for '{}' is not closed. \ + (Missing a '>'.)"</span>, <span class='ident'>s</span>), + <span class='ident'>UnclosedHex</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unclosed hexadecimal literal (missing a '}}')."</span>), + <span class='ident'>UnclosedParen</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unclosed parenthesis."</span>), + <span class='ident'>UnclosedRepeat</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unclosed counted repetition (missing a '}}')."</span>), + <span class='ident'>UnclosedUnicodeName</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unclosed Unicode literal (missing a '}}')."</span>), + <span class='ident'>UnexpectedClassEof</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Character class was not closed before the end of \ + the regex (missing a ']')."</span>), + <span class='ident'>UnexpectedEscapeEof</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Started an escape sequence that didn't finish \ + before the end of the regex."</span>), + <span class='ident'>UnexpectedFlagEof</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Inline flag settings was not closed before the end \ + of the regex (missing a ')' or ':')."</span>), + <span class='ident'>UnexpectedTwoDigitHexEof</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unexpected end of two digit hexadecimal literal."</span>), + <span class='ident'>UnopenedParen</span> <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unopened parenthesis."</span>), + <span class='ident'>UnrecognizedEscape</span>(<span class='ident'>c</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unrecognized escape sequence: '\\{}'."</span>, <span class='ident'>c</span>), + <span class='ident'>UnrecognizedFlag</span>(<span class='ident'>c</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unrecognized flag: '{}'. \ + (Allowed flags: i, s, m, U, x.)"</span>, <span class='ident'>c</span>), + <span class='ident'>UnrecognizedUnicodeClass</span>(<span class='kw-2'>ref</span> <span class='ident'>s</span>) <span class='op'>=></span> + <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>"Unrecognized Unicode class name: '{}'."</span>, <span class='ident'>s</span>), + <span class='ident'>__Nonexhaustive</span> <span class='op'>=></span> <span class='macro'>unreachable</span><span class='macro'>!</span>(), + } + } +} + +<span class='doccomment'>/// Returns the Unicode *simple* case folding of `c`.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// N.B. This is hidden because it really isn't the responsibility of this</span> +<span class='doccomment'>/// crate to do simple case folding. One hopes that either another crate or</span> +<span class='doccomment'>/// the standard library will be able to do this for us. In any case, we still</span> +<span class='doccomment'>/// expose it because it is used inside the various Regex engines.</span> +<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>simple_case_fold</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>char</span> { + <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>) + .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>[<span class='ident'>i</span>].<span class='number'>1</span>) + .<span class='ident'>unwrap_or</span>(<span class='ident'>c</span>) +} + +<span class='doccomment'>/// The result of binary search on the simple case folding table.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// This level of detail is exposed so that we can do case folding on a</span> +<span class='doccomment'>/// range of characters efficiently.</span> +<span class='kw'>fn</span> <span class='ident'>simple_case_fold_result</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> ::<span class='ident'>std</span>::<span class='ident'>result</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>usize</span>, <span class='ident'>usize</span><span class='op'>></span> { + <span class='ident'>case_folding</span>::<span class='ident'>C_plus_S_table</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&</span>(<span class='ident'>x</span>, _)<span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&</span><span class='ident'>c</span>)) +} + +<span class='doccomment'>/// Escapes all regular expression meta characters in `text`.</span> +<span class='doccomment'>///</span> +<span class='doccomment'>/// The string returned may be safely used as a literal in a regular</span> +<span class='doccomment'>/// expression.</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>quote</span>(<span class='ident'>text</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='ident'>String</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>quoted</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>with_capacity</span>(<span class='ident'>text</span>.<span class='ident'>len</span>()); + <span class='kw'>for</span> <span class='ident'>c</span> <span class='kw'>in</span> <span class='ident'>text</span>.<span class='ident'>chars</span>() { + <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) { + <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='string'>'\\'</span>); + } + <span class='ident'>quoted</span>.<span class='ident'>push</span>(<span class='ident'>c</span>); + } + <span class='ident'>quoted</span> +} + +<span class='kw'>fn</span> <span class='ident'>quote_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>String</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>new</span>(); + <span class='kw'>if</span> <span class='ident'>parser</span>::<span class='ident'>is_punct</span>(<span class='ident'>c</span>) { + <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='string'>'\\'</span>); + } + <span class='ident'>s</span>.<span class='ident'>push</span>(<span class='ident'>c</span>); + <span class='ident'>s</span> +} + +<span class='kw'>fn</span> <span class='ident'>inc_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>char</span> { + <span class='kw'>match</span> <span class='ident'>c</span> { + <span class='ident'>char</span>::<span class='ident'>MAX</span> <span class='op'>=></span> <span class='ident'>char</span>::<span class='ident'>MAX</span>, + <span class='string'>'\u{D7FF}'</span> <span class='op'>=></span> <span class='string'>'\u{E000}'</span>, + <span class='ident'>c</span> <span class='op'>=></span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>+</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(), + } +} + +<span class='kw'>fn</span> <span class='ident'>dec_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>char</span> { + <span class='kw'>match</span> <span class='ident'>c</span> { + <span class='string'>'\x00'</span> <span class='op'>=></span> <span class='string'>'\x00'</span>, + <span class='string'>'\u{E000}'</span> <span class='op'>=></span> <span class='string'>'\u{D7FF}'</span>, + <span class='ident'>c</span> <span class='op'>=></span> <span class='ident'>char</span>::<span class='ident'>from_u32</span>(<span class='ident'>c</span> <span class='kw'>as</span> <span class='ident'>u32</span> <span class='op'>-</span> <span class='number'>1</span>).<span class='ident'>unwrap</span>(), + } +} + +<span class='doccomment'>/// Returns true if and only if `c` is a word character.</span> +<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span> +<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_word_char</span>(<span class='ident'>c</span>: <span class='ident'>char</span>) <span class='op'>-></span> <span class='ident'>bool</span> { + <span class='kw'>match</span> <span class='ident'>c</span> { + <span class='string'>'_'</span> <span class='op'>|</span> <span class='string'>'0'</span> ... <span class='string'>'9'</span> <span class='op'>|</span> <span class='string'>'a'</span> ... <span class='string'>'z'</span> <span class='op'>|</span> <span class='string'>'A'</span> ... <span class='string'>'Z'</span> <span class='op'>=></span> <span class='boolval'>true</span>, + _ <span class='op'>=></span> ::<span class='ident'>unicode</span>::<span class='ident'>regex</span>::<span class='ident'>PERLW</span>.<span class='ident'>binary_search_by</span>(<span class='op'>|</span><span class='kw-2'>&</span>(<span class='ident'>start</span>, <span class='ident'>end</span>)<span class='op'>|</span> { + <span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>>=</span> <span class='ident'>start</span> <span class='op'>&&</span> <span class='ident'>c</span> <span class='op'><=</span> <span class='ident'>end</span> { + <span class='ident'>Ordering</span>::<span class='ident'>Equal</span> + } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>start</span> <span class='op'>></span> <span class='ident'>c</span> { + <span class='ident'>Ordering</span>::<span class='ident'>Greater</span> + } <span class='kw'>else</span> { + <span class='ident'>Ordering</span>::<span class='ident'>Less</span> + } + }).<span class='ident'>is_ok</span>(), + } +} + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>mod</span> <span class='ident'>properties</span>; + +<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> +<span class='kw'>mod</span> <span class='ident'>tests</span> { + <span class='kw'>use</span> {<span class='ident'>CharClass</span>, <span class='ident'>ClassRange</span>}; + + <span class='kw'>fn</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='kw'>let</span> <span class='ident'>ranges</span> <span class='op'>=</span> <span class='ident'>ranges</span>.<span class='ident'>iter</span>().<span class='ident'>cloned</span>() + .<span class='ident'>map</span>(<span class='op'>|</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)<span class='op'>|</span> <span class='ident'>ClassRange</span>::<span class='ident'>new</span>(<span class='ident'>c1</span>, <span class='ident'>c2</span>)).<span class='ident'>collect</span>(); + <span class='ident'>CharClass</span>::<span class='ident'>new</span>(<span class='ident'>ranges</span>) + } + + <span class='kw'>fn</span> <span class='ident'>classi</span>(<span class='ident'>ranges</span>: <span class='kw-2'>&</span>[(<span class='ident'>char</span>, <span class='ident'>char</span>)]) <span class='op'>-></span> <span class='ident'>CharClass</span> { + <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='ident'>ranges</span>); + <span class='ident'>cls</span>.<span class='ident'>casei</span> <span class='op'>=</span> <span class='boolval'>true</span>; + <span class='ident'>cls</span> + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_no_change</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'c'</span>), (<span class='string'>'x'</span>, <span class='string'>'z'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>cls</span>); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_unordered</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'x'</span>, <span class='string'>'z'</span>), (<span class='string'>'a'</span>, <span class='string'>'c'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'a'</span>, <span class='string'>'c'</span>), (<span class='string'>'x'</span>, <span class='string'>'z'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_overlap</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'x'</span>, <span class='string'>'z'</span>), (<span class='string'>'w'</span>, <span class='string'>'y'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'w'</span>, <span class='string'>'z'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'c'</span>, <span class='string'>'f'</span>), (<span class='string'>'a'</span>, <span class='string'>'g'</span>), (<span class='string'>'d'</span>, <span class='string'>'j'</span>), (<span class='string'>'a'</span>, <span class='string'>'c'</span>), + (<span class='string'>'m'</span>, <span class='string'>'p'</span>), (<span class='string'>'l'</span>, <span class='string'>'s'</span>), + ]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'a'</span>, <span class='string'>'j'</span>), (<span class='string'>'l'</span>, <span class='string'>'s'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_many_case_fold</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'C'</span>, <span class='string'>'F'</span>), (<span class='string'>'A'</span>, <span class='string'>'G'</span>), (<span class='string'>'D'</span>, <span class='string'>'J'</span>), (<span class='string'>'A'</span>, <span class='string'>'C'</span>), + (<span class='string'>'M'</span>, <span class='string'>'P'</span>), (<span class='string'>'L'</span>, <span class='string'>'S'</span>), (<span class='string'>'c'</span>, <span class='string'>'f'</span>), + ]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'a'</span>, <span class='string'>'j'</span>), (<span class='string'>'l'</span>, <span class='string'>'s'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_overlap_boundary</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'x'</span>, <span class='string'>'z'</span>), (<span class='string'>'u'</span>, <span class='string'>'w'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'u'</span>, <span class='string'>'z'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_extreme_edge_case</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\x00'</span>, <span class='string'>'\u{10FFFF}'</span>), (<span class='string'>'\x00'</span>, <span class='string'>'\u{10FFFF}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_canon_singles</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'a'</span>), (<span class='string'>'b'</span>, <span class='string'>'b'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'b'</span>)])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_single</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'a'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\x60'</span>), (<span class='string'>'\x62'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_singles</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'a'</span>), (<span class='string'>'b'</span>, <span class='string'>'b'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\x60'</span>), (<span class='string'>'\x63'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_multiples</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'c'</span>), (<span class='string'>'x'</span>, <span class='string'>'z'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\x60'</span>), (<span class='string'>'\x64'</span>, <span class='string'>'\x77'</span>), (<span class='string'>'\x7b'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_min_scalar</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\x00'</span>, <span class='string'>'a'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x62'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_max_scalar</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'a'</span>, <span class='string'>'\u{10FFFF}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\x60'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_everything</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\x00'</span>, <span class='string'>'\u{10FFFF}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_everything_sans_one</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\u{10FFFD}'</span>), (<span class='string'>'\u{10FFFF}'</span>, <span class='string'>'\u{10FFFF}'</span>) + ]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\u{10FFFE}'</span>, <span class='string'>'\u{10FFFE}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\x00'</span>, <span class='string'>'\u{D7FF}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\u{E000}'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_min_edge</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\x00'</span>, <span class='string'>'\u{D7FE}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\u{D7FF}'</span>, <span class='string'>'\u{10FFFF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\u{E000}'</span>, <span class='string'>'\u{10FFFF}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\u{D7FF}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_negate_surrogates_max_edge</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\u{E001}'</span>, <span class='string'>'\u{10FFFF}'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>negate</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\u{E000}'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_fold_retain_only_needed</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'A'</span>, <span class='string'>'Z'</span>), (<span class='string'>'a'</span>, <span class='string'>'z'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'a'</span>, <span class='string'>'z'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_fold_az</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'A'</span>, <span class='string'>'Z'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'a'</span>, <span class='string'>'z'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_fold_a_underscore</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'A'</span>, <span class='string'>'A'</span>), (<span class='string'>'_'</span>, <span class='string'>'_'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'A'</span>, <span class='string'>'A'</span>), (<span class='string'>'_'</span>, <span class='string'>'_'</span>), + ])); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'_'</span>, <span class='string'>'_'</span>), (<span class='string'>'a'</span>, <span class='string'>'a'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_fold_a_equals</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'A'</span>, <span class='string'>'A'</span>), (<span class='string'>'='</span>, <span class='string'>'='</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>clone</span>().<span class='ident'>canonicalize</span>(), <span class='ident'>class</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'='</span>, <span class='string'>'='</span>), (<span class='string'>'A'</span>, <span class='string'>'A'</span>), + ])); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'='</span>, <span class='string'>'='</span>), (<span class='string'>'a'</span>, <span class='string'>'a'</span>), + ])); + } + + <span class='attribute'>#[<span class='ident'>test</span>]</span> + <span class='kw'>fn</span> <span class='ident'>class_fold_no_folding_needed</span>() { + <span class='kw'>let</span> <span class='ident'>cls</span> <span class='op'>=</span> <span class='ident'>class</span>(<span class='kw-2'>&</span>[(<span class='string'>'\x00'</span>, <span class='string'>'\x10'</span>)]); + <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>cls</span>.<span class='ident'>case_fold</span>(), <span class='ident'>classi</span>(<span class='kw-2'>&</span>[ + (<span class='string'>'\x00'</span>, <span class='string'>'\x10'</span>), + ])); + } +} +</pre> +</section> + <section id='search' class="content hidden"></section> + + <section class="footer"></section> + + <div id="help" class="hidden"> + <div class="shortcuts"> + <h1>Keyboard shortcuts</h1> + <dl> + <dt>?</dt> + <dd>Show this help dialog</dd> + <dt>S</dt> + <dd>Focus the search field</dd> + <dt>⇤</dt> + <dd>Move up in search results</dd> + <dt>⇥</dt> + <dd>Move down in search results</dd> + <dt>⏎</dt> + <dd>Go to active search result</dd> + </dl> + </div> + <div class="infos"> + <h1>Search tricks</h1> + <p> + Prefix searches with a type followed by a colon (e.g. + <code>fn:</code>) to restrict the search to a given type. + </p> + <p> + Accepted types are: <code>fn</code>, <code>mod</code>, + <code>struct</code>, <code>enum</code>, + <code>trait</code>, <code>typedef</code> (or + <code>tdef</code>). + </p> + <p> + Search functions by type signature (e.g. + <code>vec -> usize</code>) + </p> + </div> + </div> + + + + <script> + window.rootPath = "../../"; 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