зеркало из https://github.com/mozilla/gecko-dev.git
355 строки
15 KiB
C++
355 строки
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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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/* parsing of CSS stylesheets, based on a token stream from the CSS scanner */
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#ifndef nsCSSParser_h___
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#define nsCSSParser_h___
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#include "mozilla/Attributes.h"
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#include "mozilla/css/Loader.h"
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#include "nsCSSPropertyID.h"
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#include "nsCSSScanner.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsStringFwd.h"
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#include "nsTArrayForwardDeclare.h"
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class nsIPrincipal;
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class nsIURI;
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struct nsCSSSelectorList;
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class nsMediaList;
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class nsMediaQuery;
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class nsCSSKeyframeRule;
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class nsCSSValue;
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struct nsRuleData;
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namespace mozilla {
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class CSSStyleSheet;
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class CSSVariableValues;
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namespace css {
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class Rule;
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class Declaration;
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class StyleRule;
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enum class SupportsParsingSettings {
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Normal,
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ImpliedParentheses
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};
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} // namespace css
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} // namespace mozilla
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// Interface to the css parser.
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class MOZ_STACK_CLASS nsCSSParser {
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public:
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explicit nsCSSParser(mozilla::css::Loader* aLoader = nullptr,
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mozilla::CSSStyleSheet* aSheet = nullptr);
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~nsCSSParser();
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static void Shutdown();
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private:
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nsCSSParser(nsCSSParser const&) = delete;
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nsCSSParser& operator=(nsCSSParser const&) = delete;
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public:
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/**
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* Parse aInput into the stylesheet that was previously passed to the
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* constructor. Calling this method on an nsCSSParser that had nullptr
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* passed in as the style sheet is an error.
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*
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* @param aInput the data to parse
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* @param aSheetURL the URI to use as the sheet URI (for error reporting).
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* This must match the URI of the sheet passed to
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* the constructor.
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* @param aBaseURI the URI to use for relative URI resolution
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* @param aSheetPrincipal the principal of the stylesheet. This must match
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* the principal of the sheet passed to the
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* constructor.
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* @param aLineNumber the line number of the first line of the sheet.
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* @param aReusableSheets style sheets that can be reused by an @import.
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* This can be nullptr.
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*/
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nsresult ParseSheet(const nsAString& aInput,
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nsIURI* aSheetURL,
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nsIURI* aBaseURI,
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nsIPrincipal* aSheetPrincipal,
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uint32_t aLineNumber,
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mozilla::css::LoaderReusableStyleSheets* aReusableSheets =
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nullptr);
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// Parse HTML style attribute or its equivalent in other markup
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// languages. aBaseURL is the base url to use for relative links in
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// the declaration.
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already_AddRefed<mozilla::css::Declaration>
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ParseStyleAttribute(const nsAString& aAttributeValue,
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nsIURI* aDocURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aNodePrincipal);
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// Parse the body of a declaration block. Very similar to
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// ParseStyleAttribute, but used under different circumstances.
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// The contents of aDeclaration will be erased and replaced with the
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// results of parsing; aChanged will be set true if the aDeclaration
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// argument was modified.
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nsresult ParseDeclarations(const nsAString& aBuffer,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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mozilla::css::Declaration* aDeclaration,
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bool* aChanged);
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nsresult ParseRule(const nsAString& aRule,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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mozilla::css::Rule** aResult);
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// Parse the value of a single CSS property, and add or replace that
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// property in aDeclaration.
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//
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// SVG "mapped attributes" (which correspond directly to CSS
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// properties) are parsed slightly differently from regular CSS; in
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// particular, units may be omitted from <length>. The 'aIsSVGMode'
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// argument controls this quirk. Note that this *only* applies to
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// mapped attributes, not inline styles or full style sheets in SVG.
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void ParseProperty(const nsCSSPropertyID aPropID,
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const nsAString& aPropValue,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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mozilla::css::Declaration* aDeclaration,
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bool* aChanged,
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bool aIsImportant,
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bool aIsSVGMode = false);
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// Same as ParseProperty but returns an nsCSSValue in aResult
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// rather than storing the property in a Declaration. aPropID
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// must be a longhand property.
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void ParseLonghandProperty(const nsCSSPropertyID aPropID,
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const nsAString& aPropValue,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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nsCSSValue& aResult);
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// Parse the value of a CSS transform property. Returns
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// whether the value was successfully parsed. If
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// aDisallowRelativeValues is true then this method will
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// only successfully parse if all values are numbers or
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// have non-relative dimensions.
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bool ParseTransformProperty(const nsAString& aPropValue,
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bool aDisallowRelativeValues,
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nsCSSValue& aResult);
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// The same as ParseProperty but for a variable.
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void ParseVariable(const nsAString& aVariableName,
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const nsAString& aPropValue,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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mozilla::css::Declaration* aDeclaration,
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bool* aChanged,
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bool aIsImportant);
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/**
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* Parse aBuffer into a media list |aMediaList|, which must be non-null,
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* replacing its current contents. |aURL| and |aLineNumber| are used for error
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* reporting.
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*/
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void ParseMediaList(const nsAString& aBuffer,
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nsIURI* aURL,
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uint32_t aLineNumber,
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nsMediaList* aMediaList);
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/*
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* Parse aBuffer into a list of media queries and their associated values,
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* according to grammar:
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* <source-size-list> = <source-size>#?
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* <source-size> = <media-condition>? <length>
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*
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* Note that this grammar is top-level: The function expects to consume the
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* entire input buffer.
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*
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* Output arrays overwritten (not appended) and are cleared in case of parse
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* failure.
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*/
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bool ParseSourceSizeList(const nsAString& aBuffer,
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nsIURI* aURI, // for error reporting
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uint32_t aLineNumber, // for error reporting
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InfallibleTArray< nsAutoPtr<nsMediaQuery> >& aQueries,
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InfallibleTArray<nsCSSValue>& aValues);
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/**
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* Parse aBuffer into a nsCSSValue |aValue|. Will return false
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* if aBuffer is not a valid font family list.
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*/
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bool ParseFontFamilyListString(const nsAString& aBuffer,
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nsIURI* aURL,
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uint32_t aLineNumber,
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nsCSSValue& aValue);
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/**
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* Parse aBuffer into a nsCSSValue |aValue|. Will return false
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* if aBuffer is not a valid CSS color specification.
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* One can use nsRuleNode::ComputeColor to compute an nscolor from
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* the returned nsCSSValue.
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*/
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bool ParseColorString(const nsAString& aBuffer,
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nsIURI* aURL,
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uint32_t aLineNumber,
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nsCSSValue& aValue,
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bool aSuppressErrors = false);
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/**
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* Parse aBuffer into a nsCSSValue |aValue|. Will return false
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* if aBuffer is not a valid CSS margin specification.
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* One can use nsRuleNode::GetRectValue to compute an nsCSSRect from
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* the returned nsCSSValue.
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*/
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bool ParseMarginString(const nsAString& aBuffer,
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nsIURI* aURL,
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uint32_t aLineNumber,
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nsCSSValue& aValue,
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bool aSuppressErrors = false);
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/**
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* Parse aBuffer into a selector list. On success, caller must
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* delete *aSelectorList when done with it.
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*/
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nsresult ParseSelectorString(const nsAString& aSelectorString,
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nsIURI* aURL,
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uint32_t aLineNumber,
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nsCSSSelectorList** aSelectorList);
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/*
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* Parse a keyframe rule (which goes inside an @keyframes rule).
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* Return it if the parse was successful.
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*/
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already_AddRefed<nsCSSKeyframeRule>
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ParseKeyframeRule(const nsAString& aBuffer,
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nsIURI* aURL,
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uint32_t aLineNumber);
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/*
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* Parse a selector list for a keyframe rule. Return whether
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* the parse succeeded.
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*/
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bool ParseKeyframeSelectorString(const nsAString& aSelectorString,
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nsIURI* aURL,
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uint32_t aLineNumber,
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InfallibleTArray<float>& aSelectorList);
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/**
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* Parse a property and value and return whether the property/value pair
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* is supported.
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*/
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bool EvaluateSupportsDeclaration(const nsAString& aProperty,
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const nsAString& aValue,
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nsIURI* aDocURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aDocPrincipal);
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/**
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* Parse an @supports condition and returns the result of evaluating the
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* condition.
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*
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* The one-argument CSS.supports() allows for providing a parentheses-less
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* @supports condition, i.e. the parentheses are "implied". In such a case,
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* aSettings can be set to ImpliedParentheses.
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*/
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bool EvaluateSupportsCondition(const nsAString& aCondition,
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nsIURI* aDocURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aDocPrincipal,
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mozilla::css::SupportsParsingSettings aSettings
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= mozilla::css::SupportsParsingSettings::Normal);
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typedef void (*VariableEnumFunc)(const nsAString&, void*);
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/**
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* Parses aPropertyValue as a property value and calls aFunc for each
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* variable reference that is found. Returns false if there was
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* a syntax error in the use of variable references.
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*/
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bool EnumerateVariableReferences(const nsAString& aPropertyValue,
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VariableEnumFunc aFunc,
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void* aData);
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/**
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* Parses aPropertyValue as a property value and resolves variable references
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* using the values in aVariables.
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*/
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bool ResolveVariableValue(const nsAString& aPropertyValue,
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const mozilla::CSSVariableValues* aVariables,
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nsString& aResult,
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nsCSSTokenSerializationType& aFirstToken,
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nsCSSTokenSerializationType& aLastToken);
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/**
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* Parses a string as a CSS token stream value for particular property,
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* resolving any variable references. The parsed property value is stored
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* in the specified nsRuleData object. If aShorthandPropertyID has a value
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* other than eCSSProperty_UNKNOWN, this is the property that will be parsed;
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* otherwise, aPropertyID will be parsed. Either way, only aPropertyID,
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* a longhand property, will be copied over to the rule data.
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*
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* If the property cannot be parsed, it will be treated as if 'initial' or
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* 'inherit' were specified, for non-inherited and inherited properties
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* respectively.
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*/
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void ParsePropertyWithVariableReferences(
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nsCSSPropertyID aPropertyID,
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nsCSSPropertyID aShorthandPropertyID,
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const nsAString& aValue,
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const mozilla::CSSVariableValues* aVariables,
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nsRuleData* aRuleData,
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nsIURI* aDocURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aDocPrincipal,
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mozilla::CSSStyleSheet* aSheet,
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uint32_t aLineNumber,
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uint32_t aLineOffset);
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/**
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* Parses a string as a counter-style name. Returns nullptr if fails.
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*/
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already_AddRefed<nsIAtom> ParseCounterStyleName(const nsAString& aBuffer,
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nsIURI* aURL);
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bool ParseCounterDescriptor(nsCSSCounterDesc aDescID,
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const nsAString& aBuffer,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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nsCSSValue& aValue);
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bool ParseFontFaceDescriptor(nsCSSFontDesc aDescID,
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const nsAString& aBuffer,
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nsIURI* aSheetURL,
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nsIURI* aBaseURL,
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nsIPrincipal* aSheetPrincipal,
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nsCSSValue& aValue);
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// Check whether a given value can be applied to a property.
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bool IsValueValidForProperty(const nsCSSPropertyID aPropID,
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const nsAString& aPropValue);
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// Return the default value to be used for -moz-control-character-visibility,
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// from preferences (cached by our Startup(), so that both nsStyleText and
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// nsRuleNode can have fast access to it).
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static uint8_t ControlCharVisibilityDefault();
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protected:
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// This is a CSSParserImpl*, but if we expose that type name in this
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// header, we can't put the type definition (in nsCSSParser.cpp) in
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// the anonymous namespace.
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void* mImpl;
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};
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#endif /* nsCSSParser_h___ */
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