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Make ParsingMode bitflags.

Browse source 
assert_parsing_mode_match() is mostly the same as
assert_restyle_hints_match().
This commit is contained in:
Hiroyuki Ikezoe 2017-05-13 18:33:48 +09:00
parent fcc50ea421
commit b6b3187efa
19 changed files with 88 additions and 58 deletions
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47
components/style/parser.rs
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@ -10,21 +10,48 @@ use error_reporting::ParseErrorReporter;
use style_traits::OneOrMoreCommaSeparated;
use stylesheets::{CssRuleType, Origin, UrlExtraData};
/// The mode to use when parsing lengths.
#[derive(PartialEq, Eq, Copy, Clone)]
pub enum ParsingMode {
/// In CSS, lengths must have units, except for zero values, where the unit can be omitted.
/// https://www.w3.org/TR/css3-values/#lengths
Default,
/// In SVG, a coordinate or length value without a unit identifier (e.g., "25") is assumed to be in user units (px).
/// https://www.w3.org/TR/SVG/coords.html#Units
AllowUnitlessLength,
bitflags! {
/// The mode to use when parsing values.
pub flags ParsingMode: u8 {
/// In CSS, lengths must have units, except for zero values, where the unit can be omitted.
/// https://www.w3.org/TR/css3-values/#lengths
const PARSING_MODE_DEFAULT = 0x00,
/// In SVG, a coordinate or length value without a unit identifier (e.g., "25") is assumed
/// to be in user units (px).
/// https://www.w3.org/TR/SVG/coords.html#Units
const PARSING_MODE_ALLOW_UNITLESS_LENGTH = 0x01,
}
}
impl ParsingMode {
/// Whether the parsing mode allows unitless lengths for non-zero values to be intpreted as px.
pub fn allows_unitless_lengths(&self) -> bool {
*self == ParsingMode::AllowUnitlessLength
self.intersects(PARSING_MODE_ALLOW_UNITLESS_LENGTH)
}
}
/// Asserts that all ParsingMode flags have a matching ParsingMode value in gecko.
#[cfg(feature = "gecko")]
#[inline]
pub fn assert_parsing_mode_match() {
use gecko_bindings::structs;
macro_rules! check_parsing_modes {
( $( $a:ident => $b:ident ),*, ) => {
if cfg!(debug_assertions) {
let mut hints = ParsingMode::all();
$(
assert_eq!(structs::$a as usize, $b.bits() as usize, stringify!($b));
hints.remove($b);
)*
assert_eq!(hints, ParsingMode::empty(), "all ParsingMode bits should have an assertion");
}
}
}
check_parsing_modes! {
ParsingMode_Default => PARSING_MODE_DEFAULT,
ParsingMode_AllowUnitlessLength => PARSING_MODE_ALLOW_UNITLESS_LENGTH,
}
}