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Implement parsing of an @viewport rule

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This commit is contained in:
James Gilbertson 2015-03-23 00:03:10 -06:00
parent c303e9dcd5
commit 3b14c07051
7 changed files with 557 additions and 16 deletions
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45
components/style/values.rs
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@ -86,6 +86,22 @@ pub mod specified {
use util::geometry::Au;
use super::CSSFloat;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum AllowedNumericType {
All,
NonNegative
}
impl AllowedNumericType {
#[inline]
pub fn is_ok(&self, value: f32) -> bool {
match self {
&AllowedNumericType::All => true,
&AllowedNumericType::NonNegative => value >= 0.,
}
}
}
#[derive(Clone, PartialEq, Debug)]
pub struct CSSColor {
pub parsed: cssparser::Color,
@ -397,33 +413,32 @@ pub mod specified {
}
}
}
impl LengthOrPercentageOrAuto {
fn parse_internal(input: &mut Parser, negative_ok: bool)
-> Result<LengthOrPercentageOrAuto, ()> {
fn parse_internal(input: &mut Parser, context: &AllowedNumericType)
-> Result<LengthOrPercentageOrAuto, ()>
{
match try!(input.next()) {
Token::Dimension(ref value, ref unit) if negative_ok || value.value >= 0. => {
Token::Dimension(ref value, ref unit) if context.is_ok(value.value) => {
Length::parse_dimension(value.value, unit)
.map(LengthOrPercentageOrAuto::Length)
}
Token::Percentage(ref value) if negative_ok || value.unit_value >= 0. => {
Ok(LengthOrPercentageOrAuto::Percentage(value.unit_value))
}
Token::Number(ref value) if value.value == 0. => {
Ok(LengthOrPercentageOrAuto::Length(Length::Absolute(Au(0))))
}
Token::Ident(ref value) if value.eq_ignore_ascii_case("auto") => {
Ok(LengthOrPercentageOrAuto::Auto)
.map(LengthOrPercentageOrAuto::Length)
}
Token::Percentage(ref value) if context.is_ok(value.unit_value) =>
Ok(LengthOrPercentageOrAuto::Percentage(value.unit_value)),
Token::Number(ref value) if context.is_ok(value.value) =>
Ok(LengthOrPercentageOrAuto::Length(Length::Absolute(Au(0)))),
Token::Ident(ref value) if value.eq_ignore_ascii_case("auto") =>
Ok(LengthOrPercentageOrAuto::Auto),
_ => Err(())
}
}
#[inline]
pub fn parse(input: &mut Parser) -> Result<LengthOrPercentageOrAuto, ()> {
LengthOrPercentageOrAuto::parse_internal(input, /* negative_ok = */ true)
LengthOrPercentageOrAuto::parse_internal(input, &AllowedNumericType::All)
}
#[inline]
pub fn parse_non_negative(input: &mut Parser) -> Result<LengthOrPercentageOrAuto, ()> {
LengthOrPercentageOrAuto::parse_internal(input, /* negative_ok = */ false)
LengthOrPercentageOrAuto::parse_internal(input, &AllowedNumericType::NonNegative)
}
}