зеркало из https://github.com/mozilla/gecko-dev.git
143 строки
5.3 KiB
Rust
143 строки
5.3 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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//! 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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#![cfg_attr(feature = "servo", feature(plugin))]
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extern crate app_units;
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#[macro_use] extern crate cssparser;
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extern crate euclid;
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#[cfg(feature = "servo")] extern crate heapsize;
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#[cfg(feature = "servo")] #[macro_use] extern crate heapsize_derive;
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extern crate selectors;
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#[cfg(feature = "servo")] #[macro_use] extern crate serde_derive;
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use selectors::parser::SelectorParseError;
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use std::borrow::Cow;
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/// Opaque type stored in type-unsafe work queues for parallel layout.
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/// Must be transmutable to and from `TNode`.
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pub type UnsafeNode = (usize, usize);
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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_traits.
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#[derive(Clone, Copy, Debug, PartialEq)]
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#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, HeapSizeOf))]
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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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#[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 values::{ToCss, OneOrMoreCommaSeparated};
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pub use viewport::HasViewportPercentage;
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/// The error type for all CSS parsing routines.
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pub type ParseError<'i> = cssparser::ParseError<'i, SelectorParseError<'i, StyleParseError<'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 StyleParseError<'i> {
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/// A bad URL token in a DVB.
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BadUrlInDeclarationValueBlock,
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/// A bad string token in a DVB.
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BadStringInDeclarationValueBlock,
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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 parsing error.
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PropertyDeclaration(PropertyDeclarationParseError),
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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(Cow<'i, str>),
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/// A media query using a ranged expression with no value was encountered.
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RangedExpressionWithNoValue,
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/// A function was encountered that was not expected.
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UnexpectedFunction(Cow<'i, str>),
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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(Cow<'i, str>),
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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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}
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/// The result of parsing a property declaration.
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#[derive(Eq, PartialEq, Copy, Clone, Debug)]
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pub enum PropertyDeclarationParseError {
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/// The property declaration was for an unknown property.
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UnknownProperty,
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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 value.
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InvalidValue,
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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<'a> From<StyleParseError<'a>> for ParseError<'a> {
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fn from(this: StyleParseError<'a>) -> Self {
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cssparser::ParseError::Custom(SelectorParseError::Custom(this))
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}
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}
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impl<'a> From<PropertyDeclarationParseError> for ParseError<'a> {
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fn from(this: PropertyDeclarationParseError) -> Self {
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cssparser::ParseError::Custom(SelectorParseError::Custom(StyleParseError::PropertyDeclaration(this)))
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}
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}
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