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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use geometry::Au;
use std::from_str::FromStr;
use std::iter::Filter;
use std::str::{CharEq, CharSplits};
use unicode::char::to_lowercase;
pub type DOMString = String;
pub type StaticCharVec = &'static [char];
pub type StaticStringVec = &'static [&'static str];
pub fn null_str_as_empty(s: &Option<DOMString>) -> DOMString {
// We don't use map_default because it would allocate "".to_string() even for Some.
match *s {
Some(ref s) => s.clone(),
None => "".to_string()
}
}
pub fn null_str_as_empty_ref<'a>(s: &'a Option<DOMString>) -> &'a str {
match *s {
Some(ref s) => s.as_slice(),
None => ""
}
}
/// Whitespace as defined by HTML5 § 2.4.1.
struct Whitespace;
impl CharEq for Whitespace {
#[inline]
fn matches(&mut self, ch: char) -> bool {
match ch {
' ' | '\t' | '\x0a' | '\x0c' | '\x0d' => true,
_ => false,
}
}
#[inline]
fn only_ascii(&self) -> bool {
true
}
}
pub fn is_whitespace(s: &str) -> bool {
s.chars().all(|c| Whitespace.matches(c))
}
/// A "space character" according to:
///
/// http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#space-character
pub static HTML_SPACE_CHARACTERS: StaticCharVec = &[
'\u0020',
'\u0009',
'\u000a',
'\u000c',
'\u000d',
];
pub fn split_html_space_chars<'a>(s: &'a str) -> Filter<'a, &'a str, CharSplits<'a, StaticCharVec>> {
s.split(HTML_SPACE_CHARACTERS).filter(|&split| !split.is_empty())
}
/// Shared implementation to parse an integer according to
/// <http://www.whatwg.org/html/#rules-for-parsing-integers> or
/// <http://www.whatwg.org/html/#rules-for-parsing-non-negative-integers>.
fn do_parse_integer<T: Iterator<char>>(input: T) -> Option<i64> {
fn is_ascii_digit(c: &char) -> bool {
match *c {
'0'...'9' => true,
_ => false,
}
}
let mut input = input.skip_while(|c| {
HTML_SPACE_CHARACTERS.iter().any(|s| s == c)
}).peekable();
let sign = match input.peek() {
None => return None,
Some(&'-') => {
input.next();
-1
},
Some(&'+') => {
input.next();
1
},
Some(_) => 1,
};
match input.peek() {
Some(c) if is_ascii_digit(c) => (),
_ => return None,
}
let value = input.take_while(is_ascii_digit).map(|d| {
d as i64 - '0' as i64
}).fold(Some(0i64), |accumulator, d| {
accumulator.and_then(|accumulator| {
accumulator.checked_mul(&10)
}).and_then(|accumulator| {
accumulator.checked_add(&d)
})
});
return value.and_then(|value| value.checked_mul(&sign));
}
/// Parse an integer according to
/// <http://www.whatwg.org/html/#rules-for-parsing-integers>.
pub fn parse_integer<T: Iterator<char>>(input: T) -> Option<i32> {
do_parse_integer(input).and_then(|result| {
result.to_i32()
})
}
/// Parse an integer according to
/// <http://www.whatwg.org/html/#rules-for-parsing-non-negative-integers>.
pub fn parse_unsigned_integer<T: Iterator<char>>(input: T) -> Option<u32> {
do_parse_integer(input).and_then(|result| {
result.to_u32()
})
}
pub enum LengthOrPercentageOrAuto {
AutoLpa,
PercentageLpa(f64),
LengthLpa(Au),
}
/// Parses a length per HTML5 § 2.4.4.4. If unparseable, `AutoLpa` is returned.
pub fn parse_length(mut value: &str) -> LengthOrPercentageOrAuto {
value = value.trim_left_chars(Whitespace);
if value.len() == 0 {
return AutoLpa
}
if value.starts_with("+") {
value = value.slice_from(1)
}
value = value.trim_left_chars('0');
if value.len() == 0 {
return AutoLpa
}
let mut end_index = value.len();
let (mut found_full_stop, mut found_percent) = (false, false);
for (i, ch) in value.chars().enumerate() {
match ch {
'0'...'9' => continue,
'%' => {
found_percent = true;
end_index = i;
break
}
'.' if !found_full_stop => {
found_full_stop = true;
continue
}
_ => {
end_index = i;
break
}
}
}
value = value.slice_to(end_index);
if found_percent {
let result: Option<f64> = FromStr::from_str(value);
match result {
Some(number) => return PercentageLpa((number as f64) / 100.0),
None => return AutoLpa,
}
}
match FromStr::from_str(value) {
Some(number) => LengthLpa(Au::from_px(number)),
None => AutoLpa,
}
}
#[deriving(Clone, Eq, PartialEq, Hash, Show)]
pub struct LowercaseString {
inner: String,
}
impl LowercaseString {
pub fn new(s: &str) -> LowercaseString {
LowercaseString {
inner: s.chars().map(to_lowercase).collect(),
}
}
}
impl Str for LowercaseString {
#[inline]
fn as_slice(&self) -> &str {
self.inner.as_slice()
}
}
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