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3ac0dd05cf
This probably doesn’t make any difference since the only thing we do with this origin is test whether it is user-agent (for internal properties), but this is more correct.
94 lines
3.3 KiB
Rust
94 lines
3.3 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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//! The context within which CSS code is parsed.
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#![deny(missing_docs)]
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use cssparser::{Parser, SourcePosition, UnicodeRange};
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use error_reporting::ParseErrorReporter;
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use style_traits::OneOrMoreCommaSeparated;
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use stylesheets::{Origin, UrlExtraData};
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/// The data that the parser needs from outside in order to parse a stylesheet.
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pub struct ParserContext<'a> {
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/// The `Origin` of the stylesheet, whether it's a user, author or
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/// user-agent stylesheet.
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pub stylesheet_origin: Origin,
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/// The extra data we need for resolving url values.
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pub url_data: &'a UrlExtraData,
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/// An error reporter to report syntax errors.
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pub error_reporter: &'a ParseErrorReporter,
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}
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impl<'a> ParserContext<'a> {
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/// Create a parser context.
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pub fn new(stylesheet_origin: Origin,
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url_data: &'a UrlExtraData,
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error_reporter: &'a ParseErrorReporter)
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-> ParserContext<'a> {
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ParserContext {
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stylesheet_origin: stylesheet_origin,
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url_data: url_data,
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error_reporter: error_reporter,
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}
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}
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/// Create a parser context for on-the-fly parsing in CSSOM
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pub fn new_for_cssom(url_data: &'a UrlExtraData,
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error_reporter: &'a ParseErrorReporter)
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-> ParserContext<'a> {
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Self::new(Origin::Author, url_data, error_reporter)
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}
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}
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/// Defaults to a no-op.
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/// Set a `RUST_LOG=style::errors` environment variable
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/// to log CSS parse errors to stderr.
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pub fn log_css_error(input: &mut Parser,
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position: SourcePosition,
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message: &str,
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parsercontext: &ParserContext) {
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let url_data = parsercontext.url_data;
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parsercontext.error_reporter.report_error(input, position, message, url_data);
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}
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// XXXManishearth Replace all specified value parse impls with impls of this
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// trait. This will make it easy to write more generic values in the future.
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/// A trait to abstract parsing of a specified value given a `ParserContext` and
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/// CSS input.
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pub trait Parse : Sized {
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/// Parse a value of this type.
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///
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/// Returns an error on failure.
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fn parse(context: &ParserContext, input: &mut Parser) -> Result<Self, ()>;
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}
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impl<T> Parse for Vec<T> where T: Parse + OneOrMoreCommaSeparated {
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fn parse(context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
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input.parse_comma_separated(|input| T::parse(context, input))
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}
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}
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/// Parse a non-empty space-separated or comma-separated list of objects parsed by parse_one
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pub fn parse_space_or_comma_separated<F, T>(input: &mut Parser, mut parse_one: F)
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-> Result<Vec<T>, ()>
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where F: FnMut(&mut Parser) -> Result<T, ()> {
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let first = parse_one(input)?;
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let mut vec = vec![first];
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loop {
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let _ = input.try(|i| i.expect_comma());
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if let Ok(val) = input.try(|i| parse_one(i)) {
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vec.push(val)
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} else {
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break
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}
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}
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Ok(vec)
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}
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impl Parse for UnicodeRange {
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fn parse(_context: &ParserContext, input: &mut Parser) -> Result<Self, ()> {
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UnicodeRange::parse(input)
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}
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}
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