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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/. */
//! This module contains shared types and messages for use by devtools/script.
//! The traits are here instead of in script so that the devtools crate can be
//! modified independently of the rest of Servo.
#![crate_name = "style_traits"]
#![crate_type = "rlib"]
#![deny(unsafe_code, missing_docs)]
#![cfg_attr(feature = "servo", feature(plugin))]
extern crate app_units;
#[macro_use] extern crate bitflags;
#[macro_use] extern crate cssparser;
extern crate euclid;
#[cfg(feature = "servo")] extern crate heapsize;
#[cfg(feature = "servo")] #[macro_use] extern crate heapsize_derive;
extern crate selectors;
#[cfg(feature = "servo")] #[macro_use] extern crate serde;
#[cfg(feature = "servo")] extern crate webrender_api;
#[cfg(feature = "servo")] extern crate servo_atoms;
#[cfg(feature = "servo")] pub use webrender_api::DevicePixel;
use cssparser::{CowRcStr, Token};
use selectors::parser::SelectorParseError;
#[cfg(feature = "servo")] use servo_atoms::Atom;
/// One hardware pixel.
///
/// This unit corresponds to the smallest addressable element of the display hardware.
#[cfg(not(feature = "servo"))]
#[derive(Clone, Copy, Debug)]
pub enum DevicePixel {}
/// Opaque type stored in type-unsafe work queues for parallel layout.
/// Must be transmutable to and from `TNode`.
pub type UnsafeNode = (usize, usize);
/// Represents a mobile style pinch zoom factor.
/// TODO(gw): Once WR supports pinch zoom, use a type directly from webrender_api.
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize, HeapSizeOf))]
pub struct PinchZoomFactor(f32);
impl PinchZoomFactor {
/// Construct a new pinch zoom factor.
pub fn new(scale: f32) -> PinchZoomFactor {
PinchZoomFactor(scale)
}
/// Get the pinch zoom factor as an untyped float.
pub fn get(&self) -> f32 {
self.0
}
}
/// One CSS "px" in the coordinate system of the "initial viewport":
/// http://www.w3.org/TR/css-device-adapt/#initial-viewport
///
/// `CSSPixel` is equal to `DeviceIndependentPixel` times a "page zoom" factor controlled by the user. This is
/// the desktop-style "full page" zoom that enlarges content but then reflows the layout viewport
/// so it still exactly fits the visible area.
///
/// At the default zoom level of 100%, one `CSSPixel` is equal to one `DeviceIndependentPixel`. However, if the
/// document is zoomed in or out then this scale may be larger or smaller.
#[derive(Clone, Copy, Debug)]
pub enum CSSPixel {}
// In summary, the hierarchy of pixel units and the factors to convert from one to the next:
//
// DevicePixel
// / hidpi_ratio => DeviceIndependentPixel
// / desktop_zoom => CSSPixel
pub mod cursor;
#[macro_use]
pub mod values;
#[macro_use]
pub mod viewport;
pub use values::{Comma, CommaWithSpace, OneOrMoreSeparated, Separator, Space, ToCss};
/// The error type for all CSS parsing routines.
pub type ParseError<'i> = cssparser::ParseError<'i, SelectorParseError<'i, StyleParseError<'i>>>;
#[derive(Clone, Debug, PartialEq)]
/// Errors that can be encountered while parsing CSS values.
pub enum StyleParseError<'i> {
/// A bad URL token in a DVB.
BadUrlInDeclarationValueBlock(CowRcStr<'i>),
/// A bad string token in a DVB.
BadStringInDeclarationValueBlock(CowRcStr<'i>),
/// Unexpected closing parenthesis in a DVB.
UnbalancedCloseParenthesisInDeclarationValueBlock,
/// Unexpected closing bracket in a DVB.
UnbalancedCloseSquareBracketInDeclarationValueBlock,
/// Unexpected closing curly bracket in a DVB.
UnbalancedCloseCurlyBracketInDeclarationValueBlock,
/// A property declaration parsing error.
PropertyDeclaration(PropertyDeclarationParseError<'i>),
/// A property declaration value had input remaining after successfully parsing.
PropertyDeclarationValueNotExhausted,
/// An unexpected dimension token was encountered.
UnexpectedDimension(CowRcStr<'i>),
/// A media query using a ranged expression with no value was encountered.
RangedExpressionWithNoValue,
/// A function was encountered that was not expected.
UnexpectedFunction(CowRcStr<'i>),
/// @namespace must be before any rule but @charset and @import
UnexpectedNamespaceRule,
/// @import must be before any rule but @charset
UnexpectedImportRule,
/// Unexpected @charset rule encountered.
UnexpectedCharsetRule,
/// Unsupported @ rule
UnsupportedAtRule(CowRcStr<'i>),
/// A placeholder for many sources of errors that require more specific variants.
UnspecifiedError,
/// An unexpected token was found within a namespace rule.
UnexpectedTokenWithinNamespace(Token<'i>),
/// An error was encountered while parsing a property value.
ValueError(ValueParseError<'i>),
}
/// Specific errors that can be encountered while parsing property values.
#[derive(Clone, Debug, PartialEq)]
pub enum ValueParseError<'i> {
/// An invalid token was encountered while parsing a color value.
InvalidColor(Token<'i>),
/// An invalid filter value was encountered.
InvalidFilter(Token<'i>),
}
impl<'a> From<ValueParseError<'a>> for ParseError<'a> {
fn from(this: ValueParseError<'a>) -> Self {
StyleParseError::ValueError(this).into()
}
}
impl<'i> ValueParseError<'i> {
/// Attempt to extract a ValueParseError value from a ParseError.
pub fn from_parse_error(this: ParseError<'i>) -> Option<ValueParseError<'i>> {
match this {
cssparser::ParseError::Custom(
SelectorParseError::Custom(
StyleParseError::ValueError(e))) => Some(e),
_ => None,
}
}
}
/// The result of parsing a property declaration.
#[derive(Clone, Debug, PartialEq)]
pub enum PropertyDeclarationParseError<'i> {
/// The property declaration was for an unknown property.
UnknownProperty(CowRcStr<'i>),
/// An unknown vendor-specific identifier was encountered.
UnknownVendorProperty,
/// The property declaration was for a disabled experimental property.
ExperimentalProperty,
/// The property declaration contained an invalid value.
InvalidValue(CowRcStr<'i>, Option<ValueParseError<'i>>),
/// The declaration contained an animation property, and we were parsing
/// this as a keyframe block (so that property should be ignored).
///
/// See: https://drafts.csswg.org/css-animations/#keyframes
AnimationPropertyInKeyframeBlock,
/// The property is not allowed within a page rule.
NotAllowedInPageRule,
}
impl<'a> From<StyleParseError<'a>> for ParseError<'a> {
fn from(this: StyleParseError<'a>) -> Self {
cssparser::ParseError::Custom(SelectorParseError::Custom(this))
}
}
impl<'a> From<PropertyDeclarationParseError<'a>> for ParseError<'a> {
fn from(this: PropertyDeclarationParseError<'a>) -> Self {
cssparser::ParseError::Custom(SelectorParseError::Custom(StyleParseError::PropertyDeclaration(this)))
}
}
bitflags! {
/// The mode to use when parsing values.
pub flags ParsingMode: u8 {
/// In CSS, lengths must have units, except for zero values, where the unit can be omitted.
/// https://www.w3.org/TR/css3-values/#lengths
const PARSING_MODE_DEFAULT = 0x00,
/// In SVG, a coordinate or length value without a unit identifier (e.g., "25") is assumed
/// to be in user units (px).
/// https://www.w3.org/TR/SVG/coords.html#Units
const PARSING_MODE_ALLOW_UNITLESS_LENGTH = 0x01,
/// In SVG, out-of-range values are not treated as an error in parsing.
/// https://www.w3.org/TR/SVG/implnote.html#RangeClamping
const PARSING_MODE_ALLOW_ALL_NUMERIC_VALUES = 0x02,
}
}
impl ParsingMode {
/// Whether the parsing mode allows unitless lengths for non-zero values to be intpreted as px.
pub fn allows_unitless_lengths(&self) -> bool {
self.intersects(PARSING_MODE_ALLOW_UNITLESS_LENGTH)
}
/// Whether the parsing mode allows all numeric values.
pub fn allows_all_numeric_values(&self) -> bool {
self.intersects(PARSING_MODE_ALLOW_ALL_NUMERIC_VALUES)
}
}
#[cfg(feature = "servo")]
/// Speculatively execute paint code in the worklet thread pool.
pub trait SpeculativePainter: Send + Sync {
/// https://drafts.css-houdini.org/css-paint-api/#draw-a-paint-image
fn speculatively_draw_a_paint_image(&self, properties: Vec<(Atom, String)>, arguments: Vec<String>);
}
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