mirror of
https://github.com/mozilla/gecko-dev.git
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b32a9cd993
Sorry for not doing it yesterday, I couldn't. cc @metajack @SimonSapin Source-Repo: https://github.com/servo/servo Source-Revision: 4ebb95ccd8e034007eacb447a054919ef4af2bf7
234 lines
7.6 KiB
Rust
234 lines
7.6 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 std::ascii::AsciiExt;
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use cssparser::{Token, Parser, Delimiter};
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use euclid::size::{Size2D, TypedSize2D};
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use properties::longhands;
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use util::geometry::{Au, ViewportPx};
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use values::specified;
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#[derive(Debug, PartialEq)]
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pub struct MediaQueryList {
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pub media_queries: Vec<MediaQuery>
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}
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#[derive(PartialEq, Eq, Copy, Clone, Debug)]
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pub enum Range<T> {
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Min(T),
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Max(T),
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//Eq(T), // FIXME: Implement parsing support for equality then re-enable this.
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}
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impl Range<specified::Length> {
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fn to_computed_range(&self, viewport_size: Size2D<Au>) -> Range<Au> {
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let compute_width = |width| {
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match width {
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&specified::Length::Absolute(value) => value,
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&specified::Length::FontRelative(value) => {
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// http://dev.w3.org/csswg/mediaqueries3/#units
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// em units are relative to the initial font-size.
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let initial_font_size = longhands::font_size::get_initial_value();
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value.to_computed_value(initial_font_size, initial_font_size)
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}
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&specified::Length::ViewportPercentage(value) =>
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value.to_computed_value(viewport_size),
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_ => unreachable!()
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}
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};
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match *self {
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Range::Min(ref width) => Range::Min(compute_width(width)),
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Range::Max(ref width) => Range::Max(compute_width(width)),
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//Range::Eq(ref width) => Range::Eq(compute_width(width))
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}
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}
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}
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impl<T: Ord> Range<T> {
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fn evaluate(&self, value: T) -> bool {
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match *self {
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Range::Min(ref width) => { value >= *width },
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Range::Max(ref width) => { value <= *width },
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//Range::Eq(ref width) => { value == *width },
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}
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}
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}
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/// http://dev.w3.org/csswg/mediaqueries-3/#media1
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#[derive(PartialEq, Copy, Clone, Debug)]
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pub enum Expression {
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/// http://dev.w3.org/csswg/mediaqueries-3/#width
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Width(Range<specified::Length>),
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}
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/// http://dev.w3.org/csswg/mediaqueries-3/#media0
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#[derive(PartialEq, Eq, Copy, Clone, Debug)]
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pub enum Qualifier {
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Only,
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Not,
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}
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#[derive(Debug, PartialEq)]
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pub struct MediaQuery {
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pub qualifier: Option<Qualifier>,
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pub media_type: MediaQueryType,
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pub expressions: Vec<Expression>,
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}
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impl MediaQuery {
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pub fn new(qualifier: Option<Qualifier>, media_type: MediaQueryType,
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expressions: Vec<Expression>) -> MediaQuery {
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MediaQuery {
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qualifier: qualifier,
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media_type: media_type,
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expressions: expressions,
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}
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}
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}
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/// http://dev.w3.org/csswg/mediaqueries-3/#media0
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#[derive(PartialEq, Eq, Copy, Clone, Debug)]
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pub enum MediaQueryType {
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All, // Always true
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MediaType(MediaType),
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}
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#[derive(PartialEq, Eq, Copy, Clone, Debug)]
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pub enum MediaType {
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Screen,
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Print,
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Unknown,
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}
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#[derive(Debug)]
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pub struct Device {
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pub media_type: MediaType,
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pub viewport_size: TypedSize2D<ViewportPx, f32>,
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}
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impl Device {
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pub fn new(media_type: MediaType, viewport_size: TypedSize2D<ViewportPx, f32>) -> Device {
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Device {
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media_type: media_type,
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viewport_size: viewport_size,
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}
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}
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}
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impl Expression {
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fn parse(input: &mut Parser) -> Result<Expression, ()> {
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try!(input.expect_parenthesis_block());
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input.parse_nested_block(|input| {
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let name = try!(input.expect_ident());
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try!(input.expect_colon());
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// TODO: Handle other media features
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match_ignore_ascii_case! { name,
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"min-width" => {
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Ok(Expression::Width(Range::Min(try!(specified::Length::parse_non_negative(input)))))
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},
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"max-width" => {
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Ok(Expression::Width(Range::Max(try!(specified::Length::parse_non_negative(input)))))
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}
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_ => Err(())
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}
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})
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}
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}
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impl MediaQuery {
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fn parse(input: &mut Parser) -> Result<MediaQuery, ()> {
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let mut expressions = vec![];
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let qualifier = if input.try(|input| input.expect_ident_matching("only")).is_ok() {
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Some(Qualifier::Only)
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} else if input.try(|input| input.expect_ident_matching("not")).is_ok() {
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Some(Qualifier::Not)
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} else {
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None
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};
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let media_type;
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if let Ok(ident) = input.try(|input| input.expect_ident()) {
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media_type = match_ignore_ascii_case! { ident,
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"screen" => MediaQueryType::MediaType(MediaType::Screen),
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"print" => MediaQueryType::MediaType(MediaType::Print),
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"all" => MediaQueryType::All
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_ => MediaQueryType::MediaType(MediaType::Unknown)
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}
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} else {
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// Media type is only optional if qualifier is not specified.
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if qualifier.is_some() {
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return Err(())
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}
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media_type = MediaQueryType::All;
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// Without a media type, require at least one expression
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expressions.push(try!(Expression::parse(input)));
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}
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// Parse any subsequent expressions
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loop {
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if input.try(|input| input.expect_ident_matching("and")).is_err() {
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return Ok(MediaQuery::new(qualifier, media_type, expressions))
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}
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expressions.push(try!(Expression::parse(input)))
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}
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}
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}
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pub fn parse_media_query_list(input: &mut Parser) -> MediaQueryList {
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let queries = if input.is_exhausted() {
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vec![MediaQuery::new(None, MediaQueryType::All, vec!())]
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} else {
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let mut media_queries = vec![];
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loop {
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media_queries.push(
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input.parse_until_before(Delimiter::Comma, MediaQuery::parse)
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.unwrap_or(MediaQuery::new(Some(Qualifier::Not),
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MediaQueryType::All,
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vec!())));
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match input.next() {
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Ok(Token::Comma) => continue,
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Ok(_) => unreachable!(),
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Err(()) => break,
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}
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}
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media_queries
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};
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MediaQueryList { media_queries: queries }
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}
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impl MediaQueryList {
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pub fn evaluate(&self, device: &Device) -> bool {
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let viewport_size = Size2D::new(Au::from_f32_px(device.viewport_size.width.get()),
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Au::from_f32_px(device.viewport_size.height.get()));
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// Check if any queries match (OR condition)
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self.media_queries.iter().any(|mq| {
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// Check if media matches. Unknown media never matches.
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let media_match = match mq.media_type {
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MediaQueryType::MediaType(MediaType::Unknown) => false,
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MediaQueryType::MediaType(media_type) => media_type == device.media_type,
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MediaQueryType::All => true,
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};
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// Check if all conditions match (AND condition)
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let query_match = media_match && mq.expressions.iter().all(|expression| {
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match expression {
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&Expression::Width(value) =>
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value.to_computed_range(viewport_size).evaluate(viewport_size.width),
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}
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});
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// Apply the logical NOT qualifier to the result
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match mq.qualifier {
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Some(Qualifier::Not) => !query_match,
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_ => query_match,
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}
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})
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}
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}
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