forked from mirrors/gecko-dev
4bdd7b8cc4
Do it so that we always try to evaluate the media expression and the modern syntax last, so that the most specific error message comes up. MozReview-Commit-ID: 2tqdAsWh6Kh
240 lines
9.2 KiB
Rust
240 lines
9.2 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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//! This module contains shared types and messages for use by devtools/script.
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//! The traits are here instead of in script so that the devtools crate can be
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//! modified independently of the rest of Servo.
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#![crate_name = "style_traits"]
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#![crate_type = "rlib"]
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#![deny(unsafe_code, missing_docs)]
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extern crate app_units;
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#[macro_use] extern crate bitflags;
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#[macro_use] extern crate cssparser;
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extern crate euclid;
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extern crate malloc_size_of;
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#[macro_use] extern crate malloc_size_of_derive;
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extern crate selectors;
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#[cfg(feature = "servo")] #[macro_use] extern crate serde;
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#[cfg(feature = "servo")] extern crate webrender_api;
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extern crate servo_arc;
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#[cfg(feature = "servo")] extern crate servo_atoms;
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#[cfg(feature = "servo")] extern crate servo_url;
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#[cfg(feature = "servo")] pub use webrender_api::DevicePixel;
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use cssparser::{CowRcStr, Token};
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use selectors::parser::SelectorParseErrorKind;
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#[cfg(feature = "servo")] use servo_atoms::Atom;
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/// One hardware pixel.
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///
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/// This unit corresponds to the smallest addressable element of the display hardware.
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#[cfg(not(feature = "servo"))]
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#[derive(Clone, Copy, Debug)]
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pub enum DevicePixel {}
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/// Represents a mobile style pinch zoom factor.
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/// TODO(gw): Once WR supports pinch zoom, use a type directly from webrender_api.
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#[derive(Clone, Copy, Debug, PartialEq)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, MallocSizeOf))]
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pub struct PinchZoomFactor(f32);
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impl PinchZoomFactor {
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/// Construct a new pinch zoom factor.
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pub fn new(scale: f32) -> PinchZoomFactor {
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PinchZoomFactor(scale)
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}
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/// Get the pinch zoom factor as an untyped float.
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pub fn get(&self) -> f32 {
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self.0
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}
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}
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/// One CSS "px" in the coordinate system of the "initial viewport":
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/// <http://www.w3.org/TR/css-device-adapt/#initial-viewport>
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///
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/// `CSSPixel` is equal to `DeviceIndependentPixel` times a "page zoom" factor controlled by the user. This is
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/// the desktop-style "full page" zoom that enlarges content but then reflows the layout viewport
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/// so it still exactly fits the visible area.
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///
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/// At the default zoom level of 100%, one `CSSPixel` is equal to one `DeviceIndependentPixel`. However, if the
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/// document is zoomed in or out then this scale may be larger or smaller.
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#[derive(Clone, Copy, Debug)]
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pub enum CSSPixel {}
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// In summary, the hierarchy of pixel units and the factors to convert from one to the next:
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//
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// DevicePixel
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// / hidpi_ratio => DeviceIndependentPixel
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// / desktop_zoom => CSSPixel
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pub mod cursor;
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pub mod specified_value_info;
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#[macro_use]
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pub mod values;
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#[macro_use]
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pub mod viewport;
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pub use specified_value_info::{CssType, KeywordsCollectFn, SpecifiedValueInfo};
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pub use values::{Comma, CommaWithSpace, CssWriter, OneOrMoreSeparated, Separator, Space, ToCss};
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/// The error type for all CSS parsing routines.
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pub type ParseError<'i> = cssparser::ParseError<'i, StyleParseErrorKind<'i>>;
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/// Error in property value parsing
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pub type ValueParseError<'i> = cssparser::ParseError<'i, ValueParseErrorKind<'i>>;
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#[derive(Clone, Debug, PartialEq)]
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/// Errors that can be encountered while parsing CSS values.
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pub enum StyleParseErrorKind<'i> {
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/// A bad URL token in a DVB.
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BadUrlInDeclarationValueBlock(CowRcStr<'i>),
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/// A bad string token in a DVB.
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BadStringInDeclarationValueBlock(CowRcStr<'i>),
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/// Unexpected closing parenthesis in a DVB.
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UnbalancedCloseParenthesisInDeclarationValueBlock,
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/// Unexpected closing bracket in a DVB.
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UnbalancedCloseSquareBracketInDeclarationValueBlock,
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/// Unexpected closing curly bracket in a DVB.
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UnbalancedCloseCurlyBracketInDeclarationValueBlock,
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/// A property declaration value had input remaining after successfully parsing.
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PropertyDeclarationValueNotExhausted,
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/// An unexpected dimension token was encountered.
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UnexpectedDimension(CowRcStr<'i>),
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/// Missing or invalid media feature name.
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MediaQueryExpectedFeatureName(CowRcStr<'i>),
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/// Missing or invalid media feature value.
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MediaQueryExpectedFeatureValue,
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/// A media feature range operator was not expected.
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MediaQueryUnexpectedOperator,
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/// min- or max- properties must have a value.
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RangedExpressionWithNoValue,
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/// A function was encountered that was not expected.
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UnexpectedFunction(CowRcStr<'i>),
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/// @namespace must be before any rule but @charset and @import
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UnexpectedNamespaceRule,
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/// @import must be before any rule but @charset
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UnexpectedImportRule,
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/// Unexpected @charset rule encountered.
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UnexpectedCharsetRule,
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/// Unsupported @ rule
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UnsupportedAtRule(CowRcStr<'i>),
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/// A placeholder for many sources of errors that require more specific variants.
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UnspecifiedError,
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/// An unexpected token was found within a namespace rule.
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UnexpectedTokenWithinNamespace(Token<'i>),
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/// An error was encountered while parsing a property value.
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ValueError(ValueParseErrorKind<'i>),
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/// An error was encountered while parsing a selector
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SelectorError(SelectorParseErrorKind<'i>),
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/// The property declaration was for an unknown property.
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UnknownProperty(CowRcStr<'i>),
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/// An unknown vendor-specific identifier was encountered.
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UnknownVendorProperty,
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/// The property declaration was for a disabled experimental property.
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ExperimentalProperty,
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/// The property declaration contained an invalid color value.
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InvalidColor(CowRcStr<'i>, Token<'i>),
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/// The property declaration contained an invalid filter value.
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InvalidFilter(CowRcStr<'i>, Token<'i>),
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/// The property declaration contained an invalid value.
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OtherInvalidValue(CowRcStr<'i>),
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/// The declaration contained an animation property, and we were parsing
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/// this as a keyframe block (so that property should be ignored).
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///
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/// See: https://drafts.csswg.org/css-animations/#keyframes
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AnimationPropertyInKeyframeBlock,
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/// The property is not allowed within a page rule.
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NotAllowedInPageRule,
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}
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impl<'i> From<ValueParseErrorKind<'i>> for StyleParseErrorKind<'i> {
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fn from(this: ValueParseErrorKind<'i>) -> Self {
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StyleParseErrorKind::ValueError(this)
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}
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}
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impl<'i> From<SelectorParseErrorKind<'i>> for StyleParseErrorKind<'i> {
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fn from(this: SelectorParseErrorKind<'i>) -> Self {
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StyleParseErrorKind::SelectorError(this)
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}
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}
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/// Specific errors that can be encountered while parsing property values.
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#[derive(Clone, Debug, PartialEq)]
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pub enum ValueParseErrorKind<'i> {
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/// An invalid token was encountered while parsing a color value.
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InvalidColor(Token<'i>),
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/// An invalid filter value was encountered.
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InvalidFilter(Token<'i>),
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}
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impl<'i> StyleParseErrorKind<'i> {
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/// Create an InvalidValue parse error
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pub fn new_invalid<S>(name: S, value_error: ParseError<'i>) -> ParseError<'i>
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where
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S: Into<CowRcStr<'i>>,
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{
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let name = name.into();
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let variant = match value_error.kind {
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cssparser::ParseErrorKind::Custom(StyleParseErrorKind::ValueError(e)) => {
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match e {
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ValueParseErrorKind::InvalidColor(token) => {
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StyleParseErrorKind::InvalidColor(name, token)
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}
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ValueParseErrorKind::InvalidFilter(token) => {
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StyleParseErrorKind::InvalidFilter(name, token)
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}
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}
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}
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_ => StyleParseErrorKind::OtherInvalidValue(name),
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};
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cssparser::ParseError {
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kind: cssparser::ParseErrorKind::Custom(variant),
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location: value_error.location,
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}
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}
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}
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bitflags! {
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/// The mode to use when parsing values.
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pub struct ParsingMode: u8 {
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/// In CSS; lengths must have units, except for zero values, where the unit can be omitted.
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/// <https://www.w3.org/TR/css3-values/#lengths>
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const DEFAULT = 0x00;
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/// In SVG; a coordinate or length value without a unit identifier (e.g., "25") is assumed
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/// to be in user units (px).
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/// <https://www.w3.org/TR/SVG/coords.html#Units>
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const ALLOW_UNITLESS_LENGTH = 0x01;
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/// In SVG; out-of-range values are not treated as an error in parsing.
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/// <https://www.w3.org/TR/SVG/implnote.html#RangeClamping>
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const ALLOW_ALL_NUMERIC_VALUES = 0x02;
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}
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}
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impl ParsingMode {
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/// Whether the parsing mode allows unitless lengths for non-zero values to be intpreted as px.
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#[inline]
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pub fn allows_unitless_lengths(&self) -> bool {
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self.intersects(ParsingMode::ALLOW_UNITLESS_LENGTH)
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}
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/// Whether the parsing mode allows all numeric values.
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#[inline]
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pub fn allows_all_numeric_values(&self) -> bool {
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self.intersects(ParsingMode::ALLOW_ALL_NUMERIC_VALUES)
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}
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}
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#[cfg(feature = "servo")]
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/// Speculatively execute paint code in the worklet thread pool.
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pub trait SpeculativePainter: Send + Sync {
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/// <https://drafts.css-houdini.org/css-paint-api/#draw-a-paint-image>
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fn speculatively_draw_a_paint_image(&self, properties: Vec<(Atom, String)>, arguments: Vec<String>);
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}
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