mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-02 15:15:23 +00:00
a3eadb1b86
Now that Declaration implements nsIStyleRule, we don't need the memory overhead of storing a StyleRule object for style attributes. We also need to change this prior to patch 5, because the changes in patch 5 that will allow rules to change (but declarations not) would otherwise break due to style attribute object merging done by nsAttrValue::ParseStyleAttribute. --HG-- extra : commitid : Ij4yRdba7wa
509 lines
18 KiB
C++
509 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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* A struct that represents the value (type and actual data) of an
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* attribute.
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*/
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#ifndef nsAttrValue_h___
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#define nsAttrValue_h___
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#include "nscore.h"
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#include "nsStringGlue.h"
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#include "nsStringBuffer.h"
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#include "nsColor.h"
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#include "nsCaseTreatment.h"
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#include "nsMargin.h"
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#include "nsCOMPtr.h"
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#include "SVGAttrValueWrapper.h"
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#include "nsTArrayForwardDeclare.h"
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#include "nsIAtom.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/dom/BindingDeclarations.h"
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// Undefine LoadImage to prevent naming conflict with Windows.
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#undef LoadImage
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class nsAString;
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class nsIDocument;
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class nsStyledElementNotElementCSSInlineStyle;
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struct MiscContainer;
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namespace mozilla {
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namespace css {
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class Declaration;
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struct URLValue;
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struct ImageValue;
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} // namespace css
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} // namespace mozilla
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#define NS_ATTRVALUE_MAX_STRINGLENGTH_ATOM 12
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#define NS_ATTRVALUE_BASETYPE_MASK (uintptr_t(3))
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#define NS_ATTRVALUE_POINTERVALUE_MASK (~NS_ATTRVALUE_BASETYPE_MASK)
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#define NS_ATTRVALUE_INTEGERTYPE_BITS 4
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#define NS_ATTRVALUE_INTEGERTYPE_MASK (uintptr_t((1 << NS_ATTRVALUE_INTEGERTYPE_BITS) - 1))
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#define NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER (1 << NS_ATTRVALUE_INTEGERTYPE_BITS)
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#define NS_ATTRVALUE_INTEGERTYPE_MAXVALUE ((1 << (31 - NS_ATTRVALUE_INTEGERTYPE_BITS)) - 1)
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#define NS_ATTRVALUE_INTEGERTYPE_MINVALUE (-NS_ATTRVALUE_INTEGERTYPE_MAXVALUE - 1)
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#define NS_ATTRVALUE_ENUMTABLEINDEX_BITS (32 - 16 - NS_ATTRVALUE_INTEGERTYPE_BITS)
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#define NS_ATTRVALUE_ENUMTABLE_VALUE_NEEDS_TO_UPPER (1 << (NS_ATTRVALUE_ENUMTABLEINDEX_BITS - 1))
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#define NS_ATTRVALUE_ENUMTABLEINDEX_MAXVALUE (NS_ATTRVALUE_ENUMTABLE_VALUE_NEEDS_TO_UPPER - 1)
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#define NS_ATTRVALUE_ENUMTABLEINDEX_MASK \
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(uintptr_t((((1 << NS_ATTRVALUE_ENUMTABLEINDEX_BITS) - 1) &~ NS_ATTRVALUE_ENUMTABLE_VALUE_NEEDS_TO_UPPER)))
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/**
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* A class used to construct a nsString from a nsStringBuffer (we might
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* want to move this to nsString at some point).
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*
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* WARNING: Note that nsCheapString doesn't take an explicit length -- it
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* assumes the string is maximally large, given the nsStringBuffer's storage
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* size. This means the given string buffer *must* be sized exactly correctly
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* for the string it contains (including one byte for a null terminator). If
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* it has any unused storage space, then that will result in bogus characters
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* at the end of our nsCheapString.
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*/
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class nsCheapString : public nsString {
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public:
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explicit nsCheapString(nsStringBuffer* aBuf)
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{
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if (aBuf)
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aBuf->ToString(aBuf->StorageSize()/sizeof(char16_t) - 1, *this);
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}
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};
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class nsAttrValue {
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friend struct MiscContainer;
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public:
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typedef nsTArray< nsCOMPtr<nsIAtom> > AtomArray;
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// This has to be the same as in ValueBaseType
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enum ValueType {
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eString = 0x00, // 00
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// 01 this value indicates an 'misc' struct
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eAtom = 0x02, // 10
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eInteger = 0x03, // 0011
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eColor = 0x07, // 0111
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eEnum = 0x0B, // 1011 This should eventually die
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ePercent = 0x0F, // 1111
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// Values below here won't matter, they'll be always stored in the 'misc'
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// struct.
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eCSSDeclaration = 0x10
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,eURL = 0x11
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,eImage = 0x12
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,eAtomArray = 0x13
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,eDoubleValue = 0x14
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,eIntMarginValue = 0x15
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,eSVGAngle = 0x16
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,eSVGTypesBegin = eSVGAngle
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,eSVGIntegerPair = 0x17
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,eSVGLength = 0x18
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,eSVGLengthList = 0x19
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,eSVGNumberList = 0x1A
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,eSVGNumberPair = 0x1B
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,eSVGPathData = 0x1C
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,eSVGPointList = 0x1D
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,eSVGPreserveAspectRatio = 0x1E
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,eSVGStringList = 0x1F
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,eSVGTransformList = 0x20
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,eSVGViewBox = 0x21
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,eSVGTypesEnd = eSVGViewBox
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};
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nsAttrValue();
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nsAttrValue(const nsAttrValue& aOther);
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explicit nsAttrValue(const nsAString& aValue);
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explicit nsAttrValue(nsIAtom* aValue);
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nsAttrValue(mozilla::css::Declaration* aValue, const nsAString* aSerialized);
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explicit nsAttrValue(const nsIntMargin& aValue);
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~nsAttrValue();
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inline const nsAttrValue& operator=(const nsAttrValue& aOther);
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static nsresult Init();
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static void Shutdown();
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ValueType Type() const;
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// Returns true when this value is self-contained and does not depend on
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// the state of its associated element.
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// Returns false when this value depends on the state of its associated
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// element and may be invalid if that state has been changed by changes to
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// that element state outside of attribute setting.
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inline bool StoresOwnData() const;
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void Reset();
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void SetTo(const nsAttrValue& aOther);
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void SetTo(const nsAString& aValue);
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void SetTo(nsIAtom* aValue);
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void SetTo(int16_t aInt);
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void SetTo(int32_t aInt, const nsAString* aSerialized);
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void SetTo(double aValue, const nsAString* aSerialized);
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void SetTo(mozilla::css::Declaration* aValue, const nsAString* aSerialized);
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void SetTo(mozilla::css::URLValue* aValue, const nsAString* aSerialized);
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void SetTo(const nsIntMargin& aValue);
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void SetTo(const nsSVGAngle& aValue, const nsAString* aSerialized);
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void SetTo(const nsSVGIntegerPair& aValue, const nsAString* aSerialized);
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void SetTo(const nsSVGLength2& aValue, const nsAString* aSerialized);
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void SetTo(const mozilla::SVGLengthList& aValue,
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const nsAString* aSerialized);
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void SetTo(const mozilla::SVGNumberList& aValue,
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const nsAString* aSerialized);
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void SetTo(const nsSVGNumberPair& aValue, const nsAString* aSerialized);
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void SetTo(const mozilla::SVGPathData& aValue, const nsAString* aSerialized);
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void SetTo(const mozilla::SVGPointList& aValue, const nsAString* aSerialized);
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void SetTo(const mozilla::SVGAnimatedPreserveAspectRatio& aValue,
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const nsAString* aSerialized);
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void SetTo(const mozilla::SVGStringList& aValue,
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const nsAString* aSerialized);
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void SetTo(const mozilla::SVGTransformList& aValue,
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const nsAString* aSerialized);
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void SetTo(const nsSVGViewBox& aValue, const nsAString* aSerialized);
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/**
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* Sets this object with the string or atom representation of aValue.
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*
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* After calling this method, this object will have type eString unless the
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* type of aValue is eAtom, in which case this object will also have type
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* eAtom.
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*/
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void SetToSerialized(const nsAttrValue& aValue);
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void SwapValueWith(nsAttrValue& aOther);
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void ToString(nsAString& aResult) const;
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inline void ToString(mozilla::dom::DOMString& aResult) const;
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/**
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* Returns the value of this object as an atom. If necessary, the value will
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* first be serialised using ToString before converting to an atom.
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*/
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already_AddRefed<nsIAtom> GetAsAtom() const;
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// Methods to get value. These methods do not convert so only use them
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// to retrieve the datatype that this nsAttrValue has.
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inline bool IsEmptyString() const;
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const nsCheapString GetStringValue() const;
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inline nsIAtom* GetAtomValue() const;
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inline int32_t GetIntegerValue() const;
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bool GetColorValue(nscolor& aColor) const;
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inline int16_t GetEnumValue() const;
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inline float GetPercentValue() const;
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inline AtomArray* GetAtomArrayValue() const;
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inline mozilla::css::Declaration* GetCSSDeclarationValue() const;
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inline mozilla::css::URLValue* GetURLValue() const;
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inline mozilla::css::ImageValue* GetImageValue() const;
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inline double GetDoubleValue() const;
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bool GetIntMarginValue(nsIntMargin& aMargin) const;
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/**
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* Returns the string corresponding to the stored enum value.
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*
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* @param aResult the string representing the enum tag
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* @param aRealTag wheter we want to have the real tag or the saved one
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*/
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void GetEnumString(nsAString& aResult, bool aRealTag) const;
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// Methods to get access to atoms we may have
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// Returns the number of atoms we have; 0 if we have none. It's OK
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// to call this without checking the type first; it handles that.
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uint32_t GetAtomCount() const;
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// Returns the atom at aIndex (0-based). Do not call this with
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// aIndex >= GetAtomCount().
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nsIAtom* AtomAt(int32_t aIndex) const;
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uint32_t HashValue() const;
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bool Equals(const nsAttrValue& aOther) const;
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// aCaseSensitive == eIgnoreCase means ASCII case-insenstive matching
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bool Equals(const nsAString& aValue, nsCaseTreatment aCaseSensitive) const;
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bool Equals(nsIAtom* aValue, nsCaseTreatment aCaseSensitive) const;
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/**
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* Compares this object with aOther according to their string representation.
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*
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* For example, when called on an object with type eInteger and value 4, and
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* given aOther of type eString and value "4", EqualsAsStrings will return
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* true (while Equals will return false).
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*/
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bool EqualsAsStrings(const nsAttrValue& aOther) const;
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/**
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* Returns true if this AttrValue is equal to the given atom, or is an
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* array which contains the given atom.
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*/
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bool Contains(nsIAtom* aValue, nsCaseTreatment aCaseSensitive) const;
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/**
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* Returns true if this AttrValue is an atom equal to the given
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* string, or is an array of atoms which contains the given string.
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* This always does a case-sensitive comparison.
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*/
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bool Contains(const nsAString& aValue) const;
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void ParseAtom(const nsAString& aValue);
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void ParseAtomArray(const nsAString& aValue);
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void ParseStringOrAtom(const nsAString& aValue);
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/**
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* Structure for a mapping from int (enum) values to strings. When you use
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* it you generally create an array of them.
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* Instantiate like this:
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* EnumTable myTable[] = {
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* { "string1", 1 },
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* { "string2", 2 },
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* { 0 }
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* }
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*/
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struct EnumTable {
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/** The string the value maps to */
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const char* tag;
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/** The enum value that maps to this string */
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int16_t value;
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};
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/**
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* Parse into an enum value.
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*
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* @param aValue the string to find the value for
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* @param aTable the enumeration to map with
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* @param aCaseSensitive specify if the parsing has to be case sensitive
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* @param aDefaultValue if non-null, this function will always return true.
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* Failure to parse aValue as one of the values in aTable will just
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* cause aDefaultValue->value to be stored as the enumeration value.
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* @return whether the enum value was found or not
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*/
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bool ParseEnumValue(const nsAString& aValue,
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const EnumTable* aTable,
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bool aCaseSensitive,
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const EnumTable* aDefaultValue = nullptr);
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/**
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* Parse a string into an integer. Can optionally parse percent (n%).
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* This method explicitly sets a lower bound of zero on the element,
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* whether it be percent or raw integer.
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*
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* @param aString the string to parse
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* @return whether the value could be parsed
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*
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* @see http://www.whatwg.org/html/#rules-for-parsing-dimension-values
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*/
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bool ParseSpecialIntValue(const nsAString& aString);
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/**
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* Parse a string value into an integer.
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*
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* @param aString the string to parse
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* @return whether the value could be parsed
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*/
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bool ParseIntValue(const nsAString& aString) {
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return ParseIntWithBounds(aString, INT32_MIN, INT32_MAX);
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}
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/**
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* Parse a string value into an integer with minimum value and maximum value.
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*
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* @param aString the string to parse
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* @param aMin the minimum value (if value is less it will be bumped up)
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* @param aMax the maximum value (if value is greater it will be chopped down)
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* @return whether the value could be parsed
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*/
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bool ParseIntWithBounds(const nsAString& aString, int32_t aMin,
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int32_t aMax = INT32_MAX);
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/**
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* Parse a string value into a non-negative integer.
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* This method follows the rules for parsing non-negative integer from:
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* http://dev.w3.org/html5/spec/infrastructure.html#rules-for-parsing-non-negative-integers
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*
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* @param aString the string to parse
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* @return whether the value is valid
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*/
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bool ParseNonNegativeIntValue(const nsAString& aString);
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/**
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* Parse a string value into a positive integer.
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* This method follows the rules for parsing non-negative integer from:
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* http://dev.w3.org/html5/spec/infrastructure.html#rules-for-parsing-non-negative-integers
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* In addition of these rules, the value has to be greater than zero.
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*
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* This is generally used for parsing content attributes which reflecting IDL
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* attributes are limited to only non-negative numbers greater than zero, see:
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* http://dev.w3.org/html5/spec/common-dom-interfaces.html#limited-to-only-non-negative-numbers-greater-than-zero
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*
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* @param aString the string to parse
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* @return whether the value was valid
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*/
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bool ParsePositiveIntValue(const nsAString& aString);
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/**
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* Parse a string into a color. This implements what HTML5 calls the
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* "rules for parsing a legacy color value".
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*
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* @param aString the string to parse
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* @return whether the value could be parsed
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*/
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bool ParseColor(const nsAString& aString);
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/**
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* Parse a string value into a double-precision floating point value.
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*
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* @param aString the string to parse
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* @return whether the value could be parsed
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*/
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bool ParseDoubleValue(const nsAString& aString);
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/**
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* Parse a lazy URI. This just sets up the storage for the URI; it
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* doesn't actually allocate it.
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*/
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bool ParseLazyURIValue(const nsAString& aString);
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/**
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* Parse a margin string of format 'top, right, bottom, left' into
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* an nsIntMargin.
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*
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* @param aString the string to parse
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* @return whether the value could be parsed
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*/
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bool ParseIntMarginValue(const nsAString& aString);
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/**
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* Convert a URL nsAttrValue to an Image nsAttrValue.
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*
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* @param aDocument the document this nsAttrValue belongs to.
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*/
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void LoadImage(nsIDocument* aDocument);
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/**
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* Parse a string into a CSS style rule.
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*
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* @param aString the style attribute value to be parsed.
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* @param aElement the element the attribute is set on.
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*/
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bool ParseStyleAttribute(const nsAString& aString,
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nsStyledElementNotElementCSSInlineStyle* aElement);
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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private:
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// These have to be the same as in ValueType
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enum ValueBaseType {
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eStringBase = eString, // 00
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eOtherBase = 0x01, // 01
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eAtomBase = eAtom, // 10
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eIntegerBase = 0x03 // 11
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};
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inline ValueBaseType BaseType() const;
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inline bool IsSVGType(ValueType aType) const;
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/**
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* Get the index of an EnumTable in the sEnumTableArray.
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* If the EnumTable is not in the sEnumTableArray, it is added.
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*
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* @param aTable the EnumTable to get the index of.
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* @return the index of the EnumTable.
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*/
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int16_t GetEnumTableIndex(const EnumTable* aTable);
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inline void SetPtrValueAndType(void* aValue, ValueBaseType aType);
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void SetIntValueAndType(int32_t aValue, ValueType aType,
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const nsAString* aStringValue);
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void SetColorValue(nscolor aColor, const nsAString& aString);
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void SetMiscAtomOrString(const nsAString* aValue);
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void ResetMiscAtomOrString();
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void SetSVGType(ValueType aType, const void* aValue,
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const nsAString* aSerialized);
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inline void ResetIfSet();
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inline void* GetPtr() const;
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inline MiscContainer* GetMiscContainer() const;
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inline int32_t GetIntInternal() const;
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// Clears the current MiscContainer. This will return null if there is no
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// existing container.
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MiscContainer* ClearMiscContainer();
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// Like ClearMiscContainer, except allocates a new container if one does not
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// exist already.
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MiscContainer* EnsureEmptyMiscContainer();
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bool EnsureEmptyAtomArray();
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already_AddRefed<nsStringBuffer>
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GetStringBuffer(const nsAString& aValue) const;
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// Given an enum table and a particular entry in that table, return
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// the actual integer value we should store.
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int32_t EnumTableEntryToValue(const EnumTable* aEnumTable,
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const EnumTable* aTableEntry);
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static nsTArray<const EnumTable*>* sEnumTableArray;
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uintptr_t mBits;
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};
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inline const nsAttrValue&
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nsAttrValue::operator=(const nsAttrValue& aOther)
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{
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SetTo(aOther);
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return *this;
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}
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inline nsIAtom*
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nsAttrValue::GetAtomValue() const
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{
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NS_PRECONDITION(Type() == eAtom, "wrong type");
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return reinterpret_cast<nsIAtom*>(GetPtr());
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}
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inline nsAttrValue::ValueBaseType
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nsAttrValue::BaseType() const
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{
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return static_cast<ValueBaseType>(mBits & NS_ATTRVALUE_BASETYPE_MASK);
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}
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|
|
|
inline void*
|
|
nsAttrValue::GetPtr() const
|
|
{
|
|
NS_ASSERTION(BaseType() != eIntegerBase,
|
|
"getting pointer from non-pointer");
|
|
return reinterpret_cast<void*>(mBits & NS_ATTRVALUE_POINTERVALUE_MASK);
|
|
}
|
|
|
|
inline bool
|
|
nsAttrValue::IsEmptyString() const
|
|
{
|
|
return !mBits;
|
|
}
|
|
|
|
inline void
|
|
nsAttrValue::ToString(mozilla::dom::DOMString& aResult) const
|
|
{
|
|
switch (Type()) {
|
|
case eString:
|
|
{
|
|
nsStringBuffer* str = static_cast<nsStringBuffer*>(GetPtr());
|
|
if (str) {
|
|
aResult.SetStringBuffer(str, str->StorageSize()/sizeof(char16_t) - 1);
|
|
}
|
|
// else aResult is already empty
|
|
return;
|
|
}
|
|
case eAtom:
|
|
{
|
|
nsIAtom *atom = static_cast<nsIAtom*>(GetPtr());
|
|
aResult.SetStringBuffer(atom->GetStringBuffer(), atom->GetLength());
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
ToString(aResult.AsAString());
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|