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</pre><pre class='rust '>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>::{<span class='self'>self</span>, <span class='ident'>BufRead</span>, <span class='ident'>Read</span>};
<span class='kw'>use</span> <span class='ident'>super</span>::{<span class='ident'>ROOT_STATE</span>, <span class='ident'>PatIdx</span>, <span class='ident'>StateIdx</span>};
<span class='doccomment'>/// An abstraction over automatons and their corresponding iterators.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Automaton</span>: <span class='ident'>Sized</span> {
<span class='doccomment'>/// Return the next state given the current state and next character.</span>
<span class='kw'>fn</span> <span class='ident'>next_state</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>si</span>: <span class='ident'>StateIdx</span>, <span class='ident'>b</span>: <span class='ident'>u8</span>) <span class='op'>-></span> <span class='ident'>StateIdx</span>;
<span class='doccomment'>/// Return true if and only if the given state and current pattern index</span>
<span class='doccomment'>/// indicate a match.</span>
<span class='kw'>fn</span> <span class='ident'>has_match</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>si</span>: <span class='ident'>StateIdx</span>, <span class='ident'>outi</span>: <span class='ident'>PatIdx</span>) <span class='op'>-></span> <span class='ident'>bool</span>;
<span class='doccomment'>/// Build a match given the current state, pattern index and input index.</span>
<span class='kw'>fn</span> <span class='ident'>get_match</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>si</span>: <span class='ident'>StateIdx</span>, <span class='ident'>outi</span>: <span class='ident'>PatIdx</span>, <span class='ident'>texti</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='ident'>Match</span>;
<span class='doccomment'>/// Attempt to skip through the input.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This returns the index into `text` at which the next match attempt</span>
<span class='doccomment'>/// should start. (If no skipping occurred, then the return value should</span>
<span class='doccomment'>/// be equal to `at`.)</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Finally, if no match is possible, then return `text.len()`.</span>
<span class='kw'>fn</span> <span class='ident'>skip_to</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>si</span>: <span class='ident'>StateIdx</span>, <span class='ident'>text</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>], <span class='ident'>at</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='ident'>usize</span>;
<span class='doccomment'>/// Returns true if and only if this automaton can skip through the input.</span>
<span class='kw'>fn</span> <span class='ident'>is_skippable</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>bool</span>;
<span class='doccomment'>/// Returns all of the patterns matched by this automaton.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The order of the patterns is the order in which they were added.</span>
<span class='kw'>fn</span> <span class='ident'>patterns</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span>[<span class='ident'>String</span>];
<span class='doccomment'>/// Returns the pattern indexed at `i`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The index corresponds to the position at which the pattern was added</span>
<span class='doccomment'>/// to the automaton, starting at `0`.</span>
<span class='kw'>fn</span> <span class='ident'>pattern</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>i</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span>;
<span class='doccomment'>/// Return the number of patterns in the automaton.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>len</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'>patterns</span>().<span class='ident'>len</span>()
}
<span class='doccomment'>/// Returns true if the automaton has no patterns.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>is_empty</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'>len</span>() <span class='op'>==</span> <span class='number'>0</span>
}
<span class='doccomment'>/// Returns an iterator of non-overlapping matches in `s`.</span>
<span class='kw'>fn</span> <span class='ident'>find</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span><span class='op'>></span>(
<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>,
<span class='ident'>s</span>: <span class='kw-2'>&</span><span class='lifetime'>'s</span> <span class='ident'>str</span>,
) <span class='op'>-></span> <span class='ident'>Matches</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='kw'>Self</span><span class='op'>></span> {
<span class='ident'>Matches</span> {
<span class='ident'>aut</span>: <span class='self'>self</span>,
<span class='ident'>text</span>: <span class='ident'>s</span>.<span class='ident'>as_bytes</span>(),
<span class='ident'>texti</span>: <span class='number'>0</span>,
<span class='ident'>si</span>: <span class='ident'>ROOT_STATE</span>,
}
}
<span class='doccomment'>/// Returns an iterator of overlapping matches in `s`.</span>
<span class='kw'>fn</span> <span class='ident'>find_overlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span><span class='op'>></span>(
<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>,
<span class='ident'>s</span>: <span class='kw-2'>&</span><span class='lifetime'>'s</span> <span class='ident'>str</span>,
) <span class='op'>-></span> <span class='ident'>MatchesOverlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='kw'>Self</span><span class='op'>></span> {
<span class='ident'>MatchesOverlapping</span> {
<span class='ident'>aut</span>: <span class='self'>self</span>,
<span class='ident'>text</span>: <span class='ident'>s</span>.<span class='ident'>as_bytes</span>(),
<span class='ident'>texti</span>: <span class='number'>0</span>,
<span class='ident'>si</span>: <span class='ident'>ROOT_STATE</span>,
<span class='ident'>outi</span>: <span class='number'>0</span>,
}
}
<span class='doccomment'>/// Returns an iterator of non-overlapping matches in the given reader.</span>
<span class='kw'>fn</span> <span class='ident'>stream_find</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>: <span class='ident'>io</span>::<span class='ident'>Read</span><span class='op'>></span>(
<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>,
<span class='ident'>rdr</span>: <span class='ident'>R</span>,
) <span class='op'>-></span> <span class='ident'>StreamMatches</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>, <span class='kw'>Self</span><span class='op'>></span> {
<span class='ident'>StreamMatches</span> {
<span class='ident'>aut</span>: <span class='self'>self</span>,
<span class='ident'>buf</span>: <span class='ident'>io</span>::<span class='ident'>BufReader</span>::<span class='ident'>new</span>(<span class='ident'>rdr</span>),
<span class='ident'>texti</span>: <span class='number'>0</span>,
<span class='ident'>si</span>: <span class='ident'>ROOT_STATE</span>,
}
}
<span class='doccomment'>/// Returns an iterator of overlapping matches in the given reader.</span>
<span class='kw'>fn</span> <span class='ident'>stream_find_overlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>: <span class='ident'>io</span>::<span class='ident'>Read</span><span class='op'>></span>(
<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>,
<span class='ident'>rdr</span>: <span class='ident'>R</span>,
) <span class='op'>-></span> <span class='ident'>StreamMatchesOverlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>, <span class='kw'>Self</span><span class='op'>></span> {
<span class='ident'>StreamMatchesOverlapping</span> {
<span class='ident'>aut</span>: <span class='self'>self</span>,
<span class='ident'>buf</span>: <span class='ident'>io</span>::<span class='ident'>BufReader</span>::<span class='ident'>new</span>(<span class='ident'>rdr</span>),
<span class='ident'>texti</span>: <span class='number'>0</span>,
<span class='ident'>si</span>: <span class='ident'>ROOT_STATE</span>,
<span class='ident'>outi</span>: <span class='number'>0</span>,
}
}
}
<span class='doccomment'>/// Records a match in the search text.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Clone</span>, <span class='ident'>Debug</span>, <span class='ident'>Hash</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'>Match</span> {
<span class='doccomment'>/// The pattern index.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This corresponds to the ordering in which the matched pattern was</span>
<span class='doccomment'>/// added to the automaton, starting at `0`.</span>
<span class='kw'>pub</span> <span class='ident'>pati</span>: <span class='ident'>usize</span>,
<span class='doccomment'>/// The starting byte offset of the match in the search text.</span>
<span class='kw'>pub</span> <span class='ident'>start</span>: <span class='ident'>usize</span>,
<span class='doccomment'>/// The ending byte offset of the match in the search text.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// (This can be re-captiulated with `pati` and adding the pattern's</span>
<span class='doccomment'>/// length to `start`, but it is convenient to have it here.)</span>
<span class='kw'>pub</span> <span class='ident'>end</span>: <span class='ident'>usize</span>,
}
<span class='doccomment'>/// An iterator of non-overlapping matches for in-memory text.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This iterator yields `Match` values.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `'a` is the lifetime of the automaton and `'s` is the lifetime of the</span>
<span class='doccomment'>/// search text.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Matches</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='ident'>A</span>: <span class='lifetime'>'a</span> <span class='op'>+</span> <span class='ident'>Automaton</span><span class='op'>></span> {
<span class='ident'>aut</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>A</span>,
<span class='ident'>text</span>: <span class='kw-2'>&</span><span class='lifetime'>'s</span> [<span class='ident'>u8</span>],
<span class='ident'>texti</span>: <span class='ident'>usize</span>,
<span class='ident'>si</span>: <span class='ident'>StateIdx</span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='ident'>A</span>: <span class='ident'>Automaton</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>Matches</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='ident'>A</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>Match</span>;
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Match</span><span class='op'>></span> {
<span class='comment'>// When there's an initial lone start byte, it is usually worth it</span>
<span class='comment'>// to use `memchr` to skip along the input. The problem is that</span>
<span class='comment'>// the skipping function is called in the inner match loop, which</span>
<span class='comment'>// can be quite costly if the skipping condition is never met.</span>
<span class='comment'>// Therefore, we lift the case analysis outside of the main loop at</span>
<span class='comment'>// the cost of repeating code.</span>
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>is_skippable</span>() {
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>skip_to</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>text</span>, <span class='self'>self</span>.<span class='ident'>texti</span>);
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'><</span> <span class='self'>self</span>.<span class='ident'>text</span>.<span class='ident'>len</span>() {
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>next_state</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>text</span>[<span class='self'>self</span>.<span class='ident'>texti</span>]);
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='number'>0</span>) {
<span class='kw'>let</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>get_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='number'>0</span>, <span class='self'>self</span>.<span class='ident'>texti</span>);
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='ident'>ROOT_STATE</span>;
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>m</span>);
}
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>skip_to</span>(
<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>text</span>, <span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+</span> <span class='number'>1</span>);
}
} <span class='kw'>else</span> {
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'><</span> <span class='self'>self</span>.<span class='ident'>text</span>.<span class='ident'>len</span>() {
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>next_state</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>text</span>[<span class='self'>self</span>.<span class='ident'>texti</span>]);
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='number'>0</span>) {
<span class='kw'>let</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>get_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='number'>0</span>, <span class='self'>self</span>.<span class='ident'>texti</span>);
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='ident'>ROOT_STATE</span>;
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>m</span>);
}
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
}
<span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// An iterator of non-overlapping matches for streaming text.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This iterator yields `io::Result<Match>` values.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `'a` is the lifetime of the automaton and `R` is the type of the underlying</span>
<span class='doccomment'>/// `io::Read`er.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>StreamMatches</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>, <span class='ident'>A</span>: <span class='lifetime'>'a</span> <span class='op'>+</span> <span class='ident'>Automaton</span><span class='op'>></span> {
<span class='ident'>aut</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>A</span>,
<span class='ident'>buf</span>: <span class='ident'>io</span>::<span class='ident'>BufReader</span><span class='op'><</span><span class='ident'>R</span><span class='op'>></span>,
<span class='ident'>texti</span>: <span class='ident'>usize</span>,
<span class='ident'>si</span>: <span class='ident'>StateIdx</span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>: <span class='ident'>io</span>::<span class='ident'>Read</span>, <span class='ident'>A</span>: <span class='ident'>Automaton</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>StreamMatches</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>, <span class='ident'>A</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Match</span><span class='op'>></span>;
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Match</span><span class='op'>>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>consumed</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='lifetime'>'LOOP</span>: <span class='kw'>loop</span> {
<span class='self'>self</span>.<span class='ident'>buf</span>.<span class='ident'>consume</span>(<span class='ident'>consumed</span>);
<span class='kw'>let</span> <span class='ident'>bs</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>buf</span>.<span class='ident'>fill_buf</span>() {
<span class='prelude-val'>Err</span>(<span class='ident'>err</span>) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='prelude-val'>Err</span>(<span class='ident'>err</span>)),
<span class='prelude-val'>Ok</span>(<span class='ident'>bs</span>) <span class='kw'>if</span> <span class='ident'>bs</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>0</span> <span class='op'>=></span> <span class='kw'>break</span>,
<span class='prelude-val'>Ok</span>(<span class='ident'>bs</span>) <span class='op'>=></span> <span class='ident'>bs</span>,
};
<span class='ident'>consumed</span> <span class='op'>=</span> <span class='ident'>bs</span>.<span class='ident'>len</span>(); <span class='comment'>// is shortened if we find a match</span>
<span class='kw'>for</span> (<span class='ident'>i</span>, <span class='kw-2'>&</span><span class='ident'>b</span>) <span class='kw'>in</span> <span class='ident'>bs</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>next_state</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='ident'>b</span>);
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='number'>0</span>) {
<span class='ident'>m</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>get_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='number'>0</span>, <span class='self'>self</span>.<span class='ident'>texti</span>)));
<span class='ident'>consumed</span> <span class='op'>=</span> <span class='ident'>i</span> <span class='op'>+</span> <span class='number'>1</span>;
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='ident'>ROOT_STATE</span>;
<span class='kw'>break</span> <span class='lifetime'>'LOOP</span>;
}
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
}
<span class='self'>self</span>.<span class='ident'>buf</span>.<span class='ident'>consume</span>(<span class='ident'>consumed</span>);
<span class='ident'>m</span>
}
}
<span class='doccomment'>/// An iterator of overlapping matches for in-memory text.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This iterator yields `Match` values.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `'a` is the lifetime of the automaton and `'s` is the lifetime of the</span>
<span class='doccomment'>/// search text.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>MatchesOverlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='ident'>A</span>: <span class='lifetime'>'a</span> <span class='op'>+</span> <span class='ident'>Automaton</span><span class='op'>></span> {
<span class='ident'>aut</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>A</span>,
<span class='ident'>text</span>: <span class='kw-2'>&</span><span class='lifetime'>'s</span> [<span class='ident'>u8</span>],
<span class='ident'>texti</span>: <span class='ident'>usize</span>,
<span class='ident'>si</span>: <span class='ident'>StateIdx</span>,
<span class='ident'>outi</span>: <span class='ident'>usize</span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='ident'>A</span>: <span class='ident'>Automaton</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>MatchesOverlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='lifetime'>'s</span>, <span class='ident'>A</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>Match</span>;
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>Match</span><span class='op'>></span> {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='kw'>let</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>get_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>, <span class='self'>self</span>.<span class='ident'>texti</span>);
<span class='self'>self</span>.<span class='ident'>outi</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
<span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>m</span>);
}
<span class='self'>self</span>.<span class='ident'>outi</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>skip_to</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>text</span>, <span class='self'>self</span>.<span class='ident'>texti</span>);
<span class='kw'>while</span> <span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'><</span> <span class='self'>self</span>.<span class='ident'>text</span>.<span class='ident'>len</span>() {
<span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>text</span>[<span class='self'>self</span>.<span class='ident'>texti</span>];
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>next_state</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='ident'>b</span>);
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='kw'>return</span> <span class='self'>self</span>.<span class='ident'>next</span>();
}
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>skip_to</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>text</span>, <span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+</span> <span class='number'>1</span>);
}
<span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// An iterator of overlapping matches for streaming text.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This iterator yields `io::Result<Match>` values.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `'a` is the lifetime of the automaton and `R` is the type of the underlying</span>
<span class='doccomment'>/// `io::Read`er.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>StreamMatchesOverlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>, <span class='ident'>A</span>: <span class='lifetime'>'a</span> <span class='op'>+</span> <span class='ident'>Automaton</span><span class='op'>></span> {
<span class='ident'>aut</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>A</span>,
<span class='ident'>buf</span>: <span class='ident'>io</span>::<span class='ident'>BufReader</span><span class='op'><</span><span class='ident'>R</span><span class='op'>></span>,
<span class='ident'>texti</span>: <span class='ident'>usize</span>,
<span class='ident'>si</span>: <span class='ident'>StateIdx</span>,
<span class='ident'>outi</span>: <span class='ident'>usize</span>,
}
<span class='kw'>impl</span><span class='op'><</span>
<span class='lifetime'>'a</span>,
<span class='ident'>R</span>: <span class='ident'>io</span>::<span class='ident'>Read</span>,
<span class='ident'>A</span>: <span class='ident'>Automaton</span>,
<span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>StreamMatchesOverlapping</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>R</span>, <span class='ident'>A</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Match</span><span class='op'>></span>;
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Match</span><span class='op'>>></span> {
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='kw'>let</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>get_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>, <span class='self'>self</span>.<span class='ident'>texti</span>);
<span class='self'>self</span>.<span class='ident'>outi</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
<span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='ident'>m</span>));
}
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>m</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>consumed</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='self'>self</span>.<span class='ident'>outi</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='lifetime'>'LOOP</span>: <span class='kw'>loop</span> {
<span class='self'>self</span>.<span class='ident'>buf</span>.<span class='ident'>consume</span>(<span class='ident'>consumed</span>);
<span class='kw'>let</span> <span class='ident'>bs</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>buf</span>.<span class='ident'>fill_buf</span>() {
<span class='prelude-val'>Err</span>(<span class='ident'>err</span>) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='prelude-val'>Err</span>(<span class='ident'>err</span>)),
<span class='prelude-val'>Ok</span>(<span class='ident'>bs</span>) <span class='kw'>if</span> <span class='ident'>bs</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='number'>0</span> <span class='op'>=></span> <span class='kw'>break</span>,
<span class='prelude-val'>Ok</span>(<span class='ident'>bs</span>) <span class='op'>=></span> <span class='ident'>bs</span>,
};
<span class='ident'>consumed</span> <span class='op'>=</span> <span class='ident'>bs</span>.<span class='ident'>len</span>(); <span class='comment'>// is shortened if we find a match</span>
<span class='kw'>for</span> (<span class='ident'>i</span>, <span class='kw-2'>&</span><span class='ident'>b</span>) <span class='kw'>in</span> <span class='ident'>bs</span>.<span class='ident'>iter</span>().<span class='ident'>enumerate</span>() {
<span class='self'>self</span>.<span class='ident'>si</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>next_state</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='ident'>b</span>);
<span class='kw'>if</span> <span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='ident'>m</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='prelude-val'>Ok</span>(<span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>get_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>,
<span class='self'>self</span>.<span class='ident'>texti</span>)));
<span class='ident'>consumed</span> <span class='op'>=</span> <span class='ident'>i</span> <span class='op'>+</span> <span class='number'>1</span>;
<span class='self'>self</span>.<span class='ident'>outi</span> <span class='op'>+=</span> <span class='number'>1</span>;
<span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>aut</span>.<span class='ident'>has_match</span>(<span class='self'>self</span>.<span class='ident'>si</span>, <span class='self'>self</span>.<span class='ident'>outi</span>) {
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
<span class='kw'>break</span> <span class='lifetime'>'LOOP</span>;
}
<span class='self'>self</span>.<span class='ident'>texti</span> <span class='op'>+=</span> <span class='number'>1</span>;
}
}
<span class='self'>self</span>.<span class='ident'>buf</span>.<span class='ident'>consume</span>(<span class='ident'>consumed</span>);
<span class='ident'>m</span>
}
}
</pre>
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