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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! The context within which CSS code is parsed.
use context::QuirksMode;
use cssparser::{Parser, SourcePosition, UnicodeRange};
use error_reporting::{ParseErrorReporter, ContextualParseError};
use style_traits::{OneOrMoreSeparated, ParseError, ParsingMode, Separator};
#[cfg(feature = "gecko")]
use style_traits::{PARSING_MODE_DEFAULT, PARSING_MODE_ALLOW_UNITLESS_LENGTH, PARSING_MODE_ALLOW_ALL_NUMERIC_VALUES};
use stylesheets::{CssRuleType, Origin, UrlExtraData, Namespaces};
/// 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 modes = ParsingMode::all();
$(
assert_eq!(structs::$a as usize, $b.bits() as usize, stringify!($b));
modes.remove($b);
)*
assert_eq!(modes, ParsingMode::empty(), "all ParsingMode bits should have an assertion");
}
}
}
check_parsing_modes! {
ParsingMode_Default => PARSING_MODE_DEFAULT,
ParsingMode_AllowUnitlessLength => PARSING_MODE_ALLOW_UNITLESS_LENGTH,
ParsingMode_AllowAllNumericValues => PARSING_MODE_ALLOW_ALL_NUMERIC_VALUES,
}
}
/// The data that the parser needs from outside in order to parse a stylesheet.
pub struct ParserContext<'a> {
/// The `Origin` of the stylesheet, whether it's a user, author or
/// user-agent stylesheet.
pub stylesheet_origin: Origin,
/// The extra data we need for resolving url values.
pub url_data: &'a UrlExtraData,
/// An error reporter to report syntax errors.
pub error_reporter: &'a ParseErrorReporter,
/// The current rule type, if any.
pub rule_type: Option<CssRuleType>,
/// Line number offsets for inline stylesheets
pub line_number_offset: u64,
/// The mode to use when parsing.
pub parsing_mode: ParsingMode,
/// The quirks mode of this stylesheet.
pub quirks_mode: QuirksMode,
/// The currently active namespaces.
pub namespaces: Option<&'a Namespaces>,
}
impl<'a> ParserContext<'a> {
/// Create a parser context.
pub fn new(stylesheet_origin: Origin,
url_data: &'a UrlExtraData,
error_reporter: &'a ParseErrorReporter,
rule_type: Option<CssRuleType>,
parsing_mode: ParsingMode,
quirks_mode: QuirksMode)
-> ParserContext<'a> {
ParserContext {
stylesheet_origin: stylesheet_origin,
url_data: url_data,
error_reporter: error_reporter,
rule_type: rule_type,
line_number_offset: 0u64,
parsing_mode: parsing_mode,
quirks_mode: quirks_mode,
namespaces: None,
}
}
/// Create a parser context for on-the-fly parsing in CSSOM
pub fn new_for_cssom(
url_data: &'a UrlExtraData,
error_reporter: &'a ParseErrorReporter,
rule_type: Option<CssRuleType>,
parsing_mode: ParsingMode,
quirks_mode: QuirksMode
) -> ParserContext<'a> {
Self::new(Origin::Author, url_data, error_reporter, rule_type, parsing_mode, quirks_mode)
}
/// Create a parser context based on a previous context, but with a modified rule type.
pub fn new_with_rule_type(
context: &'a ParserContext,
rule_type: Option<CssRuleType>
) -> ParserContext<'a> {
ParserContext {
stylesheet_origin: context.stylesheet_origin,
url_data: context.url_data,
error_reporter: context.error_reporter,
rule_type: rule_type,
line_number_offset: context.line_number_offset,
parsing_mode: context.parsing_mode,
quirks_mode: context.quirks_mode,
namespaces: context.namespaces,
}
}
/// Create a parser context for inline CSS which accepts additional line offset argument.
pub fn new_with_line_number_offset(
stylesheet_origin: Origin,
url_data: &'a UrlExtraData,
error_reporter: &'a ParseErrorReporter,
line_number_offset: u64,
parsing_mode: ParsingMode,
quirks_mode: QuirksMode
) -> ParserContext<'a> {
ParserContext {
stylesheet_origin: stylesheet_origin,
url_data: url_data,
error_reporter: error_reporter,
rule_type: None,
line_number_offset: line_number_offset,
parsing_mode: parsing_mode,
quirks_mode: quirks_mode,
namespaces: None,
}
}
/// Get the rule type, which assumes that one is available.
pub fn rule_type(&self) -> CssRuleType {
self.rule_type.expect("Rule type expected, but none was found.")
}
}
/// Defaults to a no-op.
/// Set a `RUST_LOG=style::errors` environment variable
/// to log CSS parse errors to stderr.
pub fn log_css_error<'a>(input: &mut Parser,
position: SourcePosition,
error: ContextualParseError<'a>,
parsercontext: &ParserContext) {
let url_data = parsercontext.url_data;
let line_number_offset = parsercontext.line_number_offset;
parsercontext.error_reporter.report_error(input, position,
error, url_data,
line_number_offset);
}
// XXXManishearth Replace all specified value parse impls with impls of this
// trait. This will make it easy to write more generic values in the future.
/// A trait to abstract parsing of a specified value given a `ParserContext` and
/// CSS input.
pub trait Parse : Sized {
/// Parse a value of this type.
///
/// Returns an error on failure.
fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
-> Result<Self, ParseError<'i>>;
}
impl<T> Parse for Vec<T>
where
T: Parse + OneOrMoreSeparated,
<T as OneOrMoreSeparated>::S: Separator,
{
fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>)
-> Result<Self, ParseError<'i>> {
<T as OneOrMoreSeparated>::S::parse(input, |i| T::parse(context, i))
}
}
impl Parse for UnicodeRange {
fn parse<'i, 't>(_context: &ParserContext, input: &mut Parser<'i, 't>)
-> Result<Self, ParseError<'i>> {
UnicodeRange::parse(input).map_err(|e| e.into())
}
}
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