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use encoding::types::{ DecoderTrap, EncodingRef };
use encoding::all::encodings;
use std::ops::{ Range, Deref, Index };
use std::borrow::Borrow;
use std::fmt;
// shorthand-exports for construction
pub use self::Text::Raw as tr;
pub use self::Text::Utf8 as tu;
pub use self::TextSlice::Raw as tsr;
pub use self::TextSlice::Utf8 as tsu;
/// Safe wrapper around something that's supposed to represent text.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum Text {
Raw(Vec<u8>),
Utf8(String),
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum TextSlice<'a> {
Raw(&'a [u8]),
Utf8(&'a str)
}
pub const EMPTY_RAW: TextSlice<'static> = TextSlice::Raw(&[]);
pub const EMPTY_UTF8: TextSlice<'static> = TextSlice::Utf8("");
impl Text {
pub fn decode_with(&self, e: EncodingRef, d: DecoderTrap) -> Text {
match self {
&Text::Raw(b) => match e.decode(&b, d) {
Ok(s) => Text::Utf8(s),
Err(_) => Text::Raw(b)
},
&Text::Utf8(s) => Text::Utf8(s)
}
}
pub fn try_decode_with(&self, e: EncodingRef) -> Text {
self.decode_with(DecoderTrap::Strict)
}
pub fn try_decode_as(&self, e: &str) -> Option<Text> {
encoding(e).map(|e| self.try_decode_with(e))
}
pub fn lossy_decode_with(&self, e: EncodingRef) -> Text {
self.decode_with(DecoderTrap::Replace)
}
pub fn lossy_decode_as(&self, e: &str) -> Option<Text> {
encoding(e).map(|e| self.lossy_decode_with(e))
}
pub fn raw(&self) -> Option<&[u8]> {
match self {
&Text::Raw(ref b) => Some(b),
_ => None
}
}
pub fn utf8(&self) -> Option<&str> {
match self {
&Text::Utf8(ref s) => Some(s),
_ => None
}
}
pub fn slice<'a>(&'a self, r: &Range<usize>) -> TextSlice<'a> {
match self {
&Text::Raw(ref b) => TextSlice::Raw(&b[r]),
&Text::Utf8(ref s) => TextSlice::Utf8(&s[r])
}
}
pub fn length(&self) -> usize {
match self {
&Text::Raw(ref b) => b.len(),
&Text::Utf8(ref s) => s.len()
}
}
}
impl<'a> TextSlice<'a> {
pub fn raw(&self) -> Option<&[u8]> {
match self {
&TextSlice::Raw(ref b) => Some(b),
_ => None
}
}
pub fn utf8(&self) -> Option<&str> {
match self {
&TextSlice::Utf8(ref s) => Some(s),
_ => None
}
}
}
impl<'a> From<TextSlice<'a>> for Text {
fn from(ts: TextSlice<'a>) -> Text {
match ts {
TextSlice::Raw(b) => Text::Raw(b.into()),
TextSlice::Utf8(s) => Text::Utf8(s.into())
}
}
}
impl<'a> From<&'a Text> for TextSlice<'a> {
fn from(t: &'a Text) -> TextSlice<'a> {
match t {
&Text::Raw(ref b) => TextSlice::Raw(b),
&Text::Utf8(ref s) => TextSlice::Utf8(s)
}
}
}
impl<'a> From<&'a str> for Text {
fn from(s: &'a str) -> Text {
Text::Utf8(s.into())
}
}
impl<'a> From<&'a [u8]> for Text {
fn from(b: &'a [u8]) -> Text {
Text::Raw(b.into())
}
}
impl<'a> From<&'a str> for TextSlice<'a> {
fn from(s: &'a str) -> TextSlice<'a> {
TextSlice::Utf8(s)
}
}
impl<'a> From<&'a [u8]> for TextSlice<'a> {
fn from(b: &'a [u8]) -> TextSlice<'a> {
TextSlice::Raw(b)
}
}
impl<'a> Deref for TextSlice<'a> {
type Target = [u8];
fn deref(&self) -> &[u8] {
match self {
&Text::Raw(ref b) => b,
&Text::Utf8(ref s) => s.as_bytes()
}
}
}
impl Deref for Text {
type Target = [u8];
fn deref(&self) -> &[u8] {
match self {
&Text::Raw(ref b) => b,
&Text::Utf8(ref s) => s.as_bytes()
}
}
}
/*impl<'a> PartialEq for TextSlice<'a> {
fn eq(&self, rhs: &TextSlice<'a>) -> bool {
match (self, rhs) {
(&tsr(ref b), &tsr(ref c)) => b == c,
(&tsu(ref b), &tsu(ref c)) => b == c,
_ => false
}
}
}
impl PartialEq for Text {
fn eq(&self, rhs: &Text) -> bool {
match (self, rhs) {
(&tr(ref b), &tr(ref c)) => b == c,
(&tu(ref b), &tu(ref c)) => b == c,
_ => false
}
}
}*/
pub fn encoding(s: &str) -> Option<EncodingRef> {
encodings().into_iter().cloned().find(|e| e.name() == s)
}
pub fn lossy_decode(b: &[u8], e: EncodingRef) -> String {
e.decode(b, DecoderTrap::Replace)
.ok().expect("Shouldn't error with replacing trap")
}
pub fn def_lossy_decode(b: &[u8]) -> String {
lossy_decode(b, ::ENCODING)
}
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