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d02c5b0281
Expressions with percentages may be negative or positive at computed value time. So, we can only clamp lengths at computed value time, which is what the other browsers do.
94 lines
2.9 KiB
Rust
94 lines
2.9 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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#[macro_export]
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macro_rules! define_css_keyword_enum {
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($name: ident: $( $css: expr => $variant: ident ),+,) => {
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__define_css_keyword_enum__add_optional_traits!($name [ $( $css => $variant ),+ ]);
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};
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($name: ident: $( $css: expr => $variant: ident ),+) => {
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__define_css_keyword_enum__add_optional_traits!($name [ $( $css => $variant ),+ ]);
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};
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}
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#[cfg(feature = "servo")]
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#[macro_export]
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macro_rules! __define_css_keyword_enum__add_optional_traits {
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($name: ident [ $( $css: expr => $variant: ident ),+ ]) => {
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__define_css_keyword_enum__actual! {
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$name [ Deserialize, Serialize, HeapSizeOf ] [ $( $css => $variant ),+ ]
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}
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};
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}
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#[cfg(not(feature = "servo"))]
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#[macro_export]
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macro_rules! __define_css_keyword_enum__add_optional_traits {
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($name: ident [ $( $css: expr => $variant: ident ),+ ]) => {
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__define_css_keyword_enum__actual! {
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$name [] [ $( $css => $variant ),+ ]
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}
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};
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}
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#[macro_export]
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macro_rules! __define_css_keyword_enum__actual {
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($name: ident [ $( $derived_trait: ident),* ] [ $( $css: expr => $variant: ident ),+ ]) => {
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#[allow(non_camel_case_types)]
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#[derive(Clone, Eq, PartialEq, Copy, Hash, RustcEncodable, Debug $(, $derived_trait )* )]
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pub enum $name {
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$( $variant ),+
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}
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impl $name {
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pub fn parse(input: &mut ::cssparser::Parser) -> Result<$name, ()> {
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match_ignore_ascii_case! { try!(input.expect_ident()),
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$( $css => Ok($name::$variant), )+
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_ => Err(())
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}
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}
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}
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impl ::cssparser::ToCss for $name {
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fn to_css<W>(&self, dest: &mut W) -> ::std::fmt::Result
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where W: ::std::fmt::Write {
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match *self {
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$( $name::$variant => dest.write_str($css) ),+
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}
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}
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}
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}
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}
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pub mod specified {
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use app_units::Au;
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#[repr(u8)]
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#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
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pub enum AllowedNumericType {
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All,
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NonNegative
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}
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impl AllowedNumericType {
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#[inline]
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pub fn is_ok(&self, value: f32) -> bool {
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match *self {
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AllowedNumericType::All => true,
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AllowedNumericType::NonNegative => value >= 0.,
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}
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}
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#[inline]
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pub fn clamp(&self, val: Au) -> Au {
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use std::cmp;
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match *self {
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AllowedNumericType::All => val,
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AllowedNumericType::NonNegative => cmp::max(Au(0), val),
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}
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}
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}
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}
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