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090f4863f4
Each nsCSSStyleSheet has a pointer to a nsCSSStyleSheetInner. The nsCSSStyleSheetInner is shared across multiple stylesheets, in general. The nsCSSStyleSheetInner owns the rules and the child stylesheets. What this means is that a given rule object is effectively owned by multiple sheets. However, cycles can only form through rule objects that have been JS-wrapped, and if we're JS-wrapping a rule object that means we have ensured that it's owned by only one stylesheet. Therefore, we only traverse and unlink mInner if it's uniquely owned by our sheet. Similarly, if our child sheets or any of their rules have been JS-wrapped, that means that we must have an mInner that we own outright.
385 lines
13 KiB
C++
385 lines
13 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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/*
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* representation of CSS style rules (selectors+declaration) and CSS
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* selectors
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*/
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#ifndef mozilla_css_StyleRule_h__
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#define mozilla_css_StyleRule_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/css/Rule.h"
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#include "nsString.h"
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#include "nsCOMPtr.h"
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#include "nsCSSPseudoElements.h"
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#include "nsCSSPseudoClasses.h"
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#include "nsAutoPtr.h"
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class nsIAtom;
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class nsCSSStyleSheet;
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struct nsCSSSelectorList;
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class nsCSSCompressedDataBlock;
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struct nsAtomList {
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public:
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nsAtomList(nsIAtom* aAtom);
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nsAtomList(const nsString& aAtomValue);
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~nsAtomList(void);
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/** Do a deep clone. Should be used only on the first in the linked list. */
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nsAtomList* Clone() const { return Clone(true); }
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size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
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nsCOMPtr<nsIAtom> mAtom;
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nsAtomList* mNext;
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private:
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nsAtomList* Clone(bool aDeep) const;
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nsAtomList(const nsAtomList& aCopy) MOZ_DELETE;
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nsAtomList& operator=(const nsAtomList& aCopy) MOZ_DELETE;
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};
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struct nsPseudoClassList {
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public:
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nsPseudoClassList(nsCSSPseudoClasses::Type aType);
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nsPseudoClassList(nsCSSPseudoClasses::Type aType, const PRUnichar *aString);
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nsPseudoClassList(nsCSSPseudoClasses::Type aType, const int32_t *aIntPair);
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nsPseudoClassList(nsCSSPseudoClasses::Type aType,
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nsCSSSelectorList *aSelectorList /* takes ownership */);
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~nsPseudoClassList(void);
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/** Do a deep clone. Should be used only on the first in the linked list. */
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nsPseudoClassList* Clone() const { return Clone(true); }
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size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
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union {
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// For a given value of mType, we have either:
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// a. no value, which means mMemory is always null
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// (if none of the conditions for (b), (c), or (d) is true)
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// b. a string value, which means mString/mMemory is non-null
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// (if nsCSSPseudoClasses::HasStringArg(mType))
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// c. an integer pair value, which means mNumbers/mMemory is non-null
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// (if nsCSSPseudoClasses::HasNthPairArg(mType))
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// d. a selector list, which means mSelectors is non-null
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// (if nsCSSPseudoClasses::HasSelectorListArg(mType))
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void* mMemory; // mString and mNumbers use NS_Alloc/NS_Free
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PRUnichar* mString;
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int32_t* mNumbers;
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nsCSSSelectorList* mSelectors;
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} u;
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nsCSSPseudoClasses::Type mType;
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nsPseudoClassList* mNext;
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private:
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nsPseudoClassList* Clone(bool aDeep) const;
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nsPseudoClassList(const nsPseudoClassList& aCopy) MOZ_DELETE;
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nsPseudoClassList& operator=(const nsPseudoClassList& aCopy) MOZ_DELETE;
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};
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#define NS_ATTR_FUNC_SET 0 // [attr]
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#define NS_ATTR_FUNC_EQUALS 1 // [attr=value]
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#define NS_ATTR_FUNC_INCLUDES 2 // [attr~=value] (space separated)
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#define NS_ATTR_FUNC_DASHMATCH 3 // [attr|=value] ('-' truncated)
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#define NS_ATTR_FUNC_BEGINSMATCH 4 // [attr^=value] (begins with)
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#define NS_ATTR_FUNC_ENDSMATCH 5 // [attr$=value] (ends with)
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#define NS_ATTR_FUNC_CONTAINSMATCH 6 // [attr*=value] (contains substring)
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struct nsAttrSelector {
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public:
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nsAttrSelector(int32_t aNameSpace, const nsString& aAttr);
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nsAttrSelector(int32_t aNameSpace, const nsString& aAttr, uint8_t aFunction,
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const nsString& aValue, bool aCaseSensitive);
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nsAttrSelector(int32_t aNameSpace, nsIAtom* aLowercaseAttr,
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nsIAtom* aCasedAttr, uint8_t aFunction,
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const nsString& aValue, bool aCaseSensitive);
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~nsAttrSelector(void);
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/** Do a deep clone. Should be used only on the first in the linked list. */
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nsAttrSelector* Clone() const { return Clone(true); }
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nsString mValue;
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nsAttrSelector* mNext;
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nsCOMPtr<nsIAtom> mLowercaseAttr;
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nsCOMPtr<nsIAtom> mCasedAttr;
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int32_t mNameSpace;
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uint8_t mFunction;
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bool mCaseSensitive; // If we are in an HTML document,
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// is the value case sensitive?
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private:
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nsAttrSelector* Clone(bool aDeep) const;
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nsAttrSelector(const nsAttrSelector& aCopy) MOZ_DELETE;
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nsAttrSelector& operator=(const nsAttrSelector& aCopy) MOZ_DELETE;
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};
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struct nsCSSSelector {
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public:
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nsCSSSelector(void);
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~nsCSSSelector(void);
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/** Do a deep clone. Should be used only on the first in the linked list. */
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nsCSSSelector* Clone() const { return Clone(true, true); }
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void Reset(void);
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void SetNameSpace(int32_t aNameSpace);
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void SetTag(const nsString& aTag);
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void AddID(const nsString& aID);
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void AddClass(const nsString& aClass);
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void AddPseudoClass(nsCSSPseudoClasses::Type aType);
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void AddPseudoClass(nsCSSPseudoClasses::Type aType, const PRUnichar* aString);
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void AddPseudoClass(nsCSSPseudoClasses::Type aType, const int32_t* aIntPair);
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// takes ownership of aSelectorList
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void AddPseudoClass(nsCSSPseudoClasses::Type aType,
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nsCSSSelectorList* aSelectorList);
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void AddAttribute(int32_t aNameSpace, const nsString& aAttr);
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void AddAttribute(int32_t aNameSpace, const nsString& aAttr, uint8_t aFunc,
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const nsString& aValue, bool aCaseSensitive);
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void SetOperator(PRUnichar aOperator);
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inline bool HasTagSelector() const {
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return !!mCasedTag;
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}
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inline bool IsPseudoElement() const {
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return mLowercaseTag && !mCasedTag;
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}
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// Calculate the specificity of this selector (not including its mNext!).
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int32_t CalcWeight() const;
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void ToString(nsAString& aString, nsCSSStyleSheet* aSheet,
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bool aAppend = false) const;
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private:
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void AddPseudoClassInternal(nsPseudoClassList *aPseudoClass);
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nsCSSSelector* Clone(bool aDeepNext, bool aDeepNegations) const;
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void AppendToStringWithoutCombinators(nsAString& aString,
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nsCSSStyleSheet* aSheet) const;
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void AppendToStringWithoutCombinatorsOrNegations(nsAString& aString,
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nsCSSStyleSheet* aSheet,
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bool aIsNegated)
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const;
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// Returns true if this selector can have a namespace specified (which
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// happens if and only if the default namespace would apply to this
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// selector).
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bool CanBeNamespaced(bool aIsNegated) const;
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// Calculate the specificity of this selector (not including its mNext
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// or its mNegations).
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int32_t CalcWeightWithoutNegations() const;
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public:
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// Get and set the selector's pseudo type
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nsCSSPseudoElements::Type PseudoType() const {
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return static_cast<nsCSSPseudoElements::Type>(mPseudoType);
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}
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void SetPseudoType(nsCSSPseudoElements::Type aType) {
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NS_ASSERTION(static_cast<int32_t>(aType) >= INT16_MIN &&
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static_cast<int32_t>(aType) <= INT16_MAX,
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"Out of bounds - this will overflow mPseudoType");
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mPseudoType = static_cast<int16_t>(aType);
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}
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size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
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// For case-sensitive documents, mLowercaseTag is the same as mCasedTag,
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// but in case-insensitive documents (HTML) mLowercaseTag is lowercase.
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// Also, for pseudo-elements mCasedTag will be null but mLowercaseTag
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// contains their name.
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nsCOMPtr<nsIAtom> mLowercaseTag;
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nsCOMPtr<nsIAtom> mCasedTag;
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nsAtomList* mIDList;
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nsAtomList* mClassList;
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nsPseudoClassList* mPseudoClassList; // atom for the pseudo, string for
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// the argument to functional pseudos
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nsAttrSelector* mAttrList;
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nsCSSSelector* mNegations;
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nsCSSSelector* mNext;
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int32_t mNameSpace;
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PRUnichar mOperator;
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private:
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// int16_t to make sure it packs well with mOperator
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int16_t mPseudoType;
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nsCSSSelector(const nsCSSSelector& aCopy) MOZ_DELETE;
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nsCSSSelector& operator=(const nsCSSSelector& aCopy) MOZ_DELETE;
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};
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/**
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* A selector list is the unit of selectors that each style rule has.
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* For example, "P B, H1 B { ... }" would be a selector list with two
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* items (where each |nsCSSSelectorList| object's |mSelectors| has
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* an |mNext| for the P or H1). We represent them as linked lists.
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*/
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struct nsCSSSelectorList {
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nsCSSSelectorList(void);
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~nsCSSSelectorList(void);
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/**
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* Create a new selector and push it onto the beginning of |mSelectors|,
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* setting its |mNext| to the current value of |mSelectors|. If there is an
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* earlier selector, set its |mOperator| to |aOperator|; else |aOperator|
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* must be PRUnichar(0).
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* Returns the new selector.
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* The list owns the new selector.
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* The caller is responsible for updating |mWeight|.
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*/
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nsCSSSelector* AddSelector(PRUnichar aOperator);
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/**
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* Should be used only on the first in the list
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*/
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void ToString(nsAString& aResult, nsCSSStyleSheet* aSheet);
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/**
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* Do a deep clone. Should be used only on the first in the list.
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*/
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nsCSSSelectorList* Clone() const { return Clone(true); }
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size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
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nsCSSSelector* mSelectors;
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int32_t mWeight;
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nsCSSSelectorList* mNext;
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private:
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nsCSSSelectorList* Clone(bool aDeep) const;
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nsCSSSelectorList(const nsCSSSelectorList& aCopy) MOZ_DELETE;
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nsCSSSelectorList& operator=(const nsCSSSelectorList& aCopy) MOZ_DELETE;
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};
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// 464bab7a-2fce-4f30-ab44-b7a5f3aae57d
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#define NS_CSS_STYLE_RULE_IMPL_CID \
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{ 0x464bab7a, 0x2fce, 0x4f30, \
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{ 0xab, 0x44, 0xb7, 0xa5, 0xf3, 0xaa, 0xe5, 0x7d } }
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namespace mozilla {
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namespace css {
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class Declaration;
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class DOMCSSStyleRule;
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class StyleRule;
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class ImportantRule : public nsIStyleRule {
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public:
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ImportantRule(Declaration *aDeclaration);
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NS_DECL_ISUPPORTS
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// nsIStyleRule interface
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virtual void MapRuleInfoInto(nsRuleData* aRuleData);
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#ifdef DEBUG
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virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
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#endif
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protected:
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virtual ~ImportantRule();
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// Not an owning reference; the StyleRule that owns this
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// ImportantRule also owns the mDeclaration, and any rule node
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// pointing to this rule keeps that StyleRule alive as well.
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Declaration* mDeclaration;
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friend class StyleRule;
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};
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class StyleRule MOZ_FINAL : public Rule
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{
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public:
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StyleRule(nsCSSSelectorList* aSelector,
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Declaration *aDeclaration);
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private:
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// for |Clone|
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StyleRule(const StyleRule& aCopy);
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// for |DeclarationChanged|
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StyleRule(StyleRule& aCopy,
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Declaration *aDeclaration);
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_CSS_STYLE_RULE_IMPL_CID)
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NS_DECL_ISUPPORTS_INHERITED
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// null for style attribute
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nsCSSSelectorList* Selector() { return mSelector; }
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uint32_t GetLineNumber() const { return mLineNumber; }
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void SetLineNumber(uint32_t aLineNumber) { mLineNumber = aLineNumber; }
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Declaration* GetDeclaration() const { return mDeclaration; }
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/**
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* Return a new |nsIStyleRule| instance that replaces the current
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* one, with |aDecl| replacing the previous declaration. Due to the
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* |nsIStyleRule| contract of immutability, this must be called if
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* the declaration is modified.
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*
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* |DeclarationChanged| handles replacing the object in the container
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* sheet or group rule if |aHandleContainer| is true.
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*/
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already_AddRefed<StyleRule>
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DeclarationChanged(Declaration* aDecl, bool aHandleContainer);
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nsIStyleRule* GetImportantRule() const { return mImportantRule; }
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/**
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* The rule processor must call this method before calling
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* nsRuleWalker::Forward on this rule during rule matching.
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*/
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void RuleMatched();
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// hooks for DOM rule
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void GetCssText(nsAString& aCssText);
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void SetCssText(const nsAString& aCssText);
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void GetSelectorText(nsAString& aSelectorText);
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void SetSelectorText(const nsAString& aSelectorText);
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virtual int32_t GetType() const;
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virtual already_AddRefed<Rule> Clone() const;
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virtual nsIDOMCSSRule* GetDOMRule();
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virtual nsIDOMCSSRule* GetExistingDOMRule();
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// The new mapping function.
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virtual void MapRuleInfoInto(nsRuleData* aRuleData);
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#ifdef DEBUG
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virtual void List(FILE* out = stdout, int32_t aIndent = 0) const;
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#endif
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virtual size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
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private:
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~StyleRule();
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private:
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nsCSSSelectorList* mSelector; // null for style attribute
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Declaration* mDeclaration;
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ImportantRule* mImportantRule; // initialized by RuleMatched
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DOMCSSStyleRule* mDOMRule;
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// Keep the same type so that MSVC packs them.
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uint32_t mLineNumber : 31;
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uint32_t mWasMatched : 1;
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private:
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StyleRule& operator=(const StyleRule& aCopy) MOZ_DELETE;
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};
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} // namespace css
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} // namespace mozilla
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NS_DEFINE_STATIC_IID_ACCESSOR(mozilla::css::StyleRule, NS_CSS_STYLE_RULE_IMPL_CID)
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#endif /* mozilla_css_StyleRule_h__ */
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