mirror of
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210 lines
8.1 KiB
C++
210 lines
8.1 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 "nsAString.h"
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#include "nsCSSProperty.h"
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#include "nsColor.h"
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#include "nsCOMArray.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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class nsCSSStyleSheet;
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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 nsCSSKeyframeRule;
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class nsCSSValue;
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namespace mozilla {
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namespace css {
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class Rule;
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class Declaration;
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class Loader;
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class StyleRule;
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}
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}
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// Interface to the css parser.
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class NS_STACK_CLASS nsCSSParser {
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public:
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nsCSSParser(mozilla::css::Loader* aLoader = nullptr,
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nsCSSStyleSheet* 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&) MOZ_DELETE;
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nsCSSParser& operator=(nsCSSParser const&) MOZ_DELETE;
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public:
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// Set a style sheet for the parser to fill in. The style sheet must
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// implement the nsCSSStyleSheet interface. Null can be passed in to clear
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// out an existing stylesheet reference.
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nsresult SetStyleSheet(nsCSSStyleSheet* aSheet);
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// Set whether or not to emulate Nav quirks
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nsresult SetQuirkMode(bool aQuirkMode);
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// Set loader to use for child sheets
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nsresult SetChildLoader(mozilla::css::Loader* aChildLoader);
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/**
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* Parse aInput into the stylesheet that was previously set by calling
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* SetStyleSheet. Calling this method without calling SetStyleSheet first is
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* 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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* SetStyleSheet.
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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 SetStyleSheet.
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* @param aLineNumber the line number of the first line of the sheet.
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* @param aAllowUnsafeRules see aEnableUnsafeRules in
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* mozilla::css::Loader::LoadSheetSync
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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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bool aAllowUnsafeRules);
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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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nsresult 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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mozilla::css::StyleRule** aResult);
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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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nsCOMArray<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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nsresult ParseProperty(const nsCSSProperty 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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/**
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* Parse aBuffer into a media list |aMediaList|, which must be
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* non-null, replacing its current contents. If aHTMLMode is true,
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* parse according to HTML rules, with commas as the most important
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* delimiter. Otherwise, parse according to CSS rules, with
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* parentheses and strings more important than commas. |aURL| and
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* |aLineNumber| are used for error reporting.
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*/
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nsresult ParseMediaList(const nsSubstring& aBuffer,
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nsIURI* aURL,
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uint32_t aLineNumber,
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nsMediaList* aMediaList,
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bool aHTMLMode);
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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 nsSubstring& 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 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 nsSubstring& 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 nsSubstring& 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 nsSubstring& 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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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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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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