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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
/* CSS parsing utility functions */
#ifndef mozilla_ServoCSSParser_h
#define mozilla_ServoCSSParser_h
#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/gfx/Matrix.h"
#include "mozilla/ServoTypes.h"
#include "nsColor.h"
#include "nsCSSPropertyID.h"
#include "nsDOMCSSDeclaration.h"
#include "nsStringFwd.h"
struct nsCSSRect;
struct nsTimingFunction;
struct RawServoDeclarationBlock;
template <class T>
class RefPtr;
namespace mozilla {
class ServoStyleSet;
class SharedFontList;
struct URLExtraData;
union StyleComputedFontStyleDescriptor;
namespace css {
class Loader;
namespace dom {
class Document;
class ServoCSSParser {
using ParsingEnvironment = nsDOMCSSDeclaration::ParsingEnvironment;
* Returns whether the specified string can be parsed as a valid CSS
* <color> value.
* This includes Mozilla-specific keywords such as -moz-default-color.
static bool IsValidCSSColor(const nsACString& aValue);
* Computes an nscolor from the given CSS <color> value.
* @param aStyleSet The style set whose nsPresContext will be used to
* compute system colors and other special color values.
* @param aCurrentColor The color value that currentcolor should compute to.
* @param aValue The CSS <color> value.
* @param aResultColor The resulting computed color value.
* @param aWasCurrentColor Whether aValue was currentcolor. Can be nullptr
* if the caller doesn't care.
* @param aLoader The CSS loader for document we're parsing a color for,
* so that parse errors can be reported to the console. If nullptr, errors
* won't be reported to the console.
* @return Whether aValue was successfully parsed and aResultColor was set.
static bool ComputeColor(ServoStyleSet* aStyleSet, nscolor aCurrentColor,
const nsACString& aValue, nscolor* aResultColor,
bool* aWasCurrentColor = nullptr,
css::Loader* aLoader = nullptr);
* Parse a string representing a CSS property value into a
* RawServoDeclarationBlock.
* @param aProperty The property to be parsed.
* @param aValue The specified value.
* @param aParsingEnvironment All the parsing environment data we need.
* @param aParsingMode The paring mode we apply.
* @return The parsed value as a RawServoDeclarationBlock. We put the value
* in a declaration block since that is how we represent specified values
* in Servo.
static already_AddRefed<RawServoDeclarationBlock> ParseProperty(
nsCSSPropertyID aProperty, const nsACString& aValue,
const ParsingEnvironment& aParsingEnvironment,
ParsingMode aParsingMode = ParsingMode::Default);
* Parse a animation timing function.
* @param aValue The specified value.
* @param aResult The output timing function. (output)
* @return Whether the value was successfully parsed.
static bool ParseEasing(const nsACString& aValue, nsTimingFunction& aResult);
* Parse a specified transform list into a gfx matrix.
* @param aValue The specified value.
* @param aContains3DTransform The output flag indicates whether this is any
* 3d transform function. (output)
* @param aResult The output matrix. (output)
* @return Whether the value was successfully parsed.
static bool ParseTransformIntoMatrix(const nsACString& aValue,
bool& aContains3DTransform,
gfx::Matrix4x4& aResult);
* Parse a font shorthand for FontFaceSet matching, so we only care about
* FontFamily, FontStyle, FontStretch, and FontWeight.
* @param aValue The specified value.
* @param aUrl The parser url extra data.
* @param aList The parsed FontFamily list. (output)
* @param aStyle The parsed FontStyle. (output)
* @param aStretch The parsed FontStretch. (output)
* @param aWeight The parsed FontWeight. (output)
* @return Whether the value was successfully parsed.
static bool ParseFontShorthandForMatching(
const nsACString& aValue, URLExtraData* aUrl,
RefPtr<SharedFontList>& aList, StyleComputedFontStyleDescriptor& aStyle,
float& aStretch, float& aWeight);
* Get a URLExtraData from a document.
static already_AddRefed<URLExtraData> GetURLExtraData(dom::Document*);
* Get a ParsingEnvironment from a document.
static ParsingEnvironment GetParsingEnvironment(dom::Document*);
} // namespace mozilla
#endif // mozilla_ServoCSSParser_h