зеркало из https://github.com/mozilla/gecko-dev.git
360 строки
9.8 KiB
Rust
360 строки
9.8 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use cssparser::{self, Color, RGBA};
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use geometry::Au;
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use libc::c_char;
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use num_lib::ToPrimitive;
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use std::ascii::AsciiExt;
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use std::borrow::ToOwned;
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use std::ffi::CStr;
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use std::iter::Filter;
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use std::ops::Deref;
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use std::str::{FromStr, Split, from_utf8};
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pub type DOMString = String;
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pub type StaticCharVec = &'static [char];
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pub type StaticStringVec = &'static [&'static str];
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/// Whitespace as defined by HTML5 § 2.4.1.
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// TODO(SimonSapin) Maybe a custom Pattern can be more efficient?
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const WHITESPACE: &'static [char] = &[' ', '\t', '\x0a', '\x0c', '\x0d'];
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pub fn is_whitespace(s: &str) -> bool {
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s.chars().all(char_is_whitespace)
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}
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#[inline]
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pub fn char_is_whitespace(c: char) -> bool {
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WHITESPACE.contains(&c)
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}
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/// A "space character" according to:
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///
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/// https://html.spec.whatwg.org/multipage/#space-character
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pub static HTML_SPACE_CHARACTERS: StaticCharVec = &[
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'\u{0020}',
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'\u{0009}',
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'\u{000a}',
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'\u{000c}',
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'\u{000d}',
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];
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pub fn split_html_space_chars<'a>(s: &'a str) ->
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Filter<Split<'a, StaticCharVec>, fn(&&str) -> bool> {
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fn not_empty(&split: &&str) -> bool { !split.is_empty() }
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s.split(HTML_SPACE_CHARACTERS).filter(not_empty as fn(&&str) -> bool)
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}
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/// Shared implementation to parse an integer according to
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/// <https://html.spec.whatwg.org/#rules-for-parsing-integers> or
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/// <https://html.spec.whatwg.org/#rules-for-parsing-non-negative-integers>
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fn do_parse_integer<T: Iterator<Item=char>>(input: T) -> Option<i64> {
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fn is_ascii_digit(c: &char) -> bool {
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match *c {
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'0'...'9' => true,
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_ => false,
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}
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}
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let mut input = input.skip_while(|c| {
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HTML_SPACE_CHARACTERS.iter().any(|s| s == c)
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}).peekable();
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let sign = match input.peek() {
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None => return None,
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Some(&'-') => {
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input.next();
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-1
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},
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Some(&'+') => {
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input.next();
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1
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},
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Some(_) => 1,
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};
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match input.peek() {
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Some(c) if is_ascii_digit(c) => (),
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_ => return None,
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}
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let value = input.take_while(is_ascii_digit).map(|d| {
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d as i64 - '0' as i64
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}).fold(Some(0i64), |accumulator, d| {
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accumulator.and_then(|accumulator| {
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accumulator.checked_mul(10)
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}).and_then(|accumulator| {
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accumulator.checked_add(d)
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})
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});
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return value.and_then(|value| value.checked_mul(sign));
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}
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/// Parse an integer according to
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/// <https://html.spec.whatwg.org/#rules-for-parsing-integers>.
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pub fn parse_integer<T: Iterator<Item=char>>(input: T) -> Option<i32> {
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do_parse_integer(input).and_then(|result| {
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result.to_i32()
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})
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}
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/// Parse an integer according to
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/// <https://html.spec.whatwg.org/#rules-for-parsing-non-negative-integers>
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pub fn parse_unsigned_integer<T: Iterator<Item=char>>(input: T) -> Option<u32> {
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do_parse_integer(input).and_then(|result| {
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result.to_u32()
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})
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}
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#[derive(Copy, Clone, Debug)]
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pub enum LengthOrPercentageOrAuto {
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Auto,
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Percentage(f32),
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Length(Au),
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}
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/// Parses a length per HTML5 § 2.4.4.4. If unparseable, `Auto` is returned.
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pub fn parse_length(mut value: &str) -> LengthOrPercentageOrAuto {
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value = value.trim_left_matches(WHITESPACE);
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if value.is_empty() {
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return LengthOrPercentageOrAuto::Auto
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}
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if value.starts_with("+") {
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value = &value[1..]
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}
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value = value.trim_left_matches('0');
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if value.is_empty() {
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return LengthOrPercentageOrAuto::Auto
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}
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let mut end_index = value.len();
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let (mut found_full_stop, mut found_percent) = (false, false);
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for (i, ch) in value.chars().enumerate() {
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match ch {
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'0'...'9' => continue,
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'%' => {
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found_percent = true;
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end_index = i;
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break
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}
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'.' if !found_full_stop => {
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found_full_stop = true;
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continue
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}
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_ => {
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end_index = i;
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break
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}
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}
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}
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value = &value[..end_index];
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if found_percent {
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let result: Result<f32, _> = FromStr::from_str(value);
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match result {
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Ok(number) => return LengthOrPercentageOrAuto::Percentage((number as f32) / 100.0),
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Err(_) => return LengthOrPercentageOrAuto::Auto,
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}
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}
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match FromStr::from_str(value) {
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Ok(number) => LengthOrPercentageOrAuto::Length(Au::from_px(number)),
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Err(_) => LengthOrPercentageOrAuto::Auto,
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}
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}
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/// Parses a legacy color per HTML5 § 2.4.6. If unparseable, `Err` is returned.
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pub fn parse_legacy_color(mut input: &str) -> Result<RGBA, ()> {
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// Steps 1 and 2.
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if input.is_empty() {
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return Err(())
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}
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// Step 3.
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input = input.trim_matches(WHITESPACE);
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// Step 4.
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if input.eq_ignore_ascii_case("transparent") {
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return Err(())
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}
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// Step 5.
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match cssparser::parse_color_keyword(input) {
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Ok(Color::RGBA(rgba)) => return Ok(rgba),
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_ => {}
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}
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// Step 6.
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if input.len() == 4 {
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match (input.as_bytes()[0],
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hex(input.as_bytes()[1] as char),
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hex(input.as_bytes()[2] as char),
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hex(input.as_bytes()[3] as char)) {
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(b'#', Ok(r), Ok(g), Ok(b)) => {
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return Ok(RGBA {
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red: (r as f32) * 17.0 / 255.0,
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green: (g as f32) * 17.0 / 255.0,
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blue: (b as f32) * 17.0 / 255.0,
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alpha: 1.0,
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})
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}
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_ => {}
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}
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}
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// Step 7.
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let mut new_input = String::new();
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for ch in input.chars() {
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if ch as u32 > 0xffff {
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new_input.push_str("00")
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} else {
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new_input.push(ch)
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}
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}
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let mut input = &*new_input;
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// Step 8.
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for (char_count, (index, _)) in input.char_indices().enumerate() {
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if char_count == 128 {
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input = &input[..index];
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break
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}
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}
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// Step 9.
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if input.as_bytes()[0] == b'#' {
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input = &input[1..]
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}
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// Step 10.
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let mut new_input = Vec::new();
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for ch in input.chars() {
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if hex(ch).is_ok() {
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new_input.push(ch as u8)
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} else {
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new_input.push(b'0')
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}
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}
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let mut input = new_input;
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// Step 11.
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while input.is_empty() || (input.len() % 3) != 0 {
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input.push(b'0')
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}
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// Step 12.
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let mut length = input.len() / 3;
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let (mut red, mut green, mut blue) = (&input[..length],
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&input[length..length * 2],
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&input[length * 2..]);
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// Step 13.
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if length > 8 {
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red = &red[length - 8..];
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green = &green[length - 8..];
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blue = &blue[length - 8..];
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length = 8
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}
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// Step 14.
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while length > 2 && red[0] == b'0' && green[0] == b'0' && blue[0] == b'0' {
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red = &red[1..];
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green = &green[1..];
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blue = &blue[1..];
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length -= 1
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}
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// Steps 15-20.
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return Ok(RGBA {
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red: hex_string(red).unwrap() as f32 / 255.0,
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green: hex_string(green).unwrap() as f32 / 255.0,
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blue: hex_string(blue).unwrap() as f32 / 255.0,
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alpha: 1.0,
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});
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fn hex(ch: char) -> Result<u8, ()> {
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match ch {
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'0'...'9' => Ok((ch as u8) - b'0'),
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'a'...'f' => Ok((ch as u8) - b'a' + 10),
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'A'...'F' => Ok((ch as u8) - b'A' + 10),
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_ => Err(()),
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}
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}
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fn hex_string(string: &[u8]) -> Result<u8, ()> {
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match string.len() {
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0 => Err(()),
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1 => hex(string[0] as char),
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_ => {
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let upper = try!(hex(string[0] as char));
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let lower = try!(hex(string[1] as char));
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Ok((upper << 4) | lower)
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}
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}
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}
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}
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#[derive(Clone, Eq, PartialEq, Hash, Debug)]
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pub struct LowercaseString {
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inner: String,
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}
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impl LowercaseString {
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pub fn new(s: &str) -> LowercaseString {
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LowercaseString {
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inner: s.to_lowercase(),
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}
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}
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}
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impl Deref for LowercaseString {
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type Target = str;
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#[inline]
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fn deref(&self) -> &str {
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&*self.inner
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}
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}
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/// Creates a String from the given null-terminated buffer.
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/// Panics if the buffer does not contain UTF-8.
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pub unsafe fn c_str_to_string(s: *const c_char) -> String {
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from_utf8(CStr::from_ptr(s).to_bytes()).unwrap().to_owned()
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}
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pub fn str_join<T: AsRef<str>>(strs: &[T], join: &str) -> String {
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strs.iter().fold(String::new(), |mut acc, s| {
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if !acc.is_empty() { acc.push_str(join); }
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acc.push_str(s.as_ref());
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acc
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})
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}
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// Lifted from Rust's StrExt implementation, which is being removed.
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pub fn slice_chars(s: &str, begin: usize, end: usize) -> &str {
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assert!(begin <= end);
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let mut count = 0;
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let mut begin_byte = None;
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let mut end_byte = None;
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// This could be even more efficient by not decoding,
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// only finding the char boundaries
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for (idx, _) in s.char_indices() {
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if count == begin { begin_byte = Some(idx); }
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if count == end { end_byte = Some(idx); break; }
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count += 1;
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}
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if begin_byte.is_none() && count == begin { begin_byte = Some(s.len()) }
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if end_byte.is_none() && count == end { end_byte = Some(s.len()) }
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match (begin_byte, end_byte) {
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(None, _) => panic!("slice_chars: `begin` is beyond end of string"),
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(_, None) => panic!("slice_chars: `end` is beyond end of string"),
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(Some(a), Some(b)) => unsafe { s.slice_unchecked(a, b) }
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}
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}
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