зеркало из https://github.com/mozilla/pjs.git
428 строки
13 KiB
C++
428 строки
13 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* IBM Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2003
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* IBM Corporation. All Rights Reserved.
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*
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* Contributor(s):
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* IBM Corporation
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsString.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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typedef unsigned long PtrBits;
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class nsAString;
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class nsIAtom;
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class nsICSSStyleRule;
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class nsISVGValue;
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class nsIDocument;
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template<class E> class nsCOMArray;
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template<class E> class nsTPtrArray;
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#define NS_ATTRVALUE_MAX_STRINGLENGTH_ATOM 12
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#define NS_ATTRVALUE_BASETYPE_MASK (PtrBits(3))
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#define NS_ATTRVALUE_POINTERVALUE_MASK (~NS_ATTRVALUE_BASETYPE_MASK)
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#define NS_ATTRVALUE_INTEGERTYPE_BITS 5
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#define NS_ATTRVALUE_INTEGERTYPE_MASK (PtrBits((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_ENUMTABLEINDEX_MAXVALUE ((1 << NS_ATTRVALUE_ENUMTABLEINDEX_BITS) - 1)
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#define NS_ATTRVALUE_ENUMTABLEINDEX_MASK (PtrBits((1 << NS_ATTRVALUE_ENUMTABLEINDEX_BITS) - 1))
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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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class nsCheapString : public nsString {
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public:
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nsCheapString(nsStringBuffer* aBuf)
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{
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if (aBuf)
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aBuf->ToString(aBuf->StorageSize()/2 - 1, *this);
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}
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};
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class nsAttrValue {
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public:
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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(nsICSSStyleRule* aValue);
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#ifdef MOZ_SVG
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explicit nsAttrValue(nsISVGValue* aValue);
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#endif
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~nsAttrValue();
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static nsresult Init();
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static void Shutdown();
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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, // 00011
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eColor = 0x07, // 00111
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eProportional = 0x0B, // 01011
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eEnum = 0x0F, // 01111 This should eventually die
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ePercent = 0x13, // 10011
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// Values below here won't matter, they'll be stored in the 'misc' struct
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// anyway
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eCSSStyleRule = 0x14,
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eAtomArray = 0x15
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#ifdef MOZ_SVG
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,eSVGValue = 0x16
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#endif
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};
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ValueType Type() 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(PRInt16 aInt);
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void SetTo(nsICSSStyleRule* aValue);
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#ifdef MOZ_SVG
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void SetTo(nsISVGValue* aValue);
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#endif
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void SwapValueWith(nsAttrValue& aOther);
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void ToString(nsAString& aResult) 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 PRBool IsEmptyString() const;
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const nsCheapString GetStringValue() const;
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inline nsIAtom* GetAtomValue() const;
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inline PRInt32 GetIntegerValue() const;
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PRBool GetColorValue(nscolor& aColor) const;
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inline PRInt32 GetProportionalValue() const;
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inline PRInt16 GetEnumValue() const;
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inline float GetPercentValue() const;
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inline nsCOMArray<nsIAtom>* GetAtomArrayValue() const;
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inline nsICSSStyleRule* GetCSSStyleRuleValue() const;
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#ifdef MOZ_SVG
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inline nsISVGValue* GetSVGValue() const;
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#endif
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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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PRInt32 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(PRInt32 aIndex) const;
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PRUint32 HashValue() const;
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PRBool Equals(const nsAttrValue& aOther) const;
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PRBool Equals(const nsAString& aValue, nsCaseTreatment aCaseSensitive) const;
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PRBool Equals(nsIAtom* aValue, nsCaseTreatment aCaseSensitive) 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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PRBool Contains(nsIAtom* aValue, nsCaseTreatment aCaseSensitive) 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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PRInt16 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 aResult the enum mapping [OUT]
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* @return whether the enum value was found or not
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*/
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PRBool ParseEnumValue(const nsAString& aValue,
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const EnumTable* aTable,
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PRBool aCaseSensitive = PR_FALSE);
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/**
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* Parse a string into an integer. Can optionally parse percent (n%) and
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* proportional (n*). This method explicitly sets a lower bound of zero on
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* the element, whether it be proportional or percent or raw integer.
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*
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* @param aString the string to parse
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* @param aCanBePercent PR_TRUE if it can be a percent value (%)
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* @param aCanBeProportional PR_TRUE if it can be a proportional value (*)
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* @return whether the value could be parsed
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*/
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PRBool ParseSpecialIntValue(const nsAString& aString,
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PRBool aCanBePercent,
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PRBool aCanBeProportional);
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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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PRBool ParseIntValue(const nsAString& aString) {
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return ParseIntWithBounds(aString, NS_ATTRVALUE_INTEGERTYPE_MINVALUE,
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NS_ATTRVALUE_INTEGERTYPE_MAXVALUE);
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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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PRBool ParseIntWithBounds(const nsAString& aString, PRInt32 aMin,
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PRInt32 aMax = NS_ATTRVALUE_INTEGERTYPE_MAXVALUE);
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/**
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* Parse a string into a color.
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*
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* @param aString the string to parse
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* @param aDocument the document (to find out whether we're in quirks mode)
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* @return whether the value could be parsed
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*/
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PRBool ParseColor(const nsAString& aString, nsIDocument* aDocument);
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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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struct MiscContainer
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{
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ValueType mType;
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union {
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nscolor mColor;
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nsICSSStyleRule* mCSSStyleRule;
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nsCOMArray<nsIAtom>* mAtomArray;
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#ifdef MOZ_SVG
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nsISVGValue* mSVGValue;
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#endif
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};
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};
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inline ValueBaseType BaseType() const;
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inline void SetPtrValueAndType(void* aValue, ValueBaseType aType);
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inline void SetIntValueAndType(PRInt32 aValue, ValueType aType);
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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 PRInt32 GetIntInternal() const;
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PRBool EnsureEmptyMiscContainer();
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PRBool EnsureEmptyAtomArray();
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static nsTPtrArray<const EnumTable>* sEnumTableArray;
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PtrBits mBits;
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};
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/**
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* Implementation of inline methods
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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 PRInt32
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nsAttrValue::GetIntegerValue() const
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{
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NS_PRECONDITION(Type() == eInteger, "wrong type");
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return GetIntInternal();
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}
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inline PRInt32
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nsAttrValue::GetProportionalValue() const
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{
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NS_PRECONDITION(Type() == eProportional, "wrong type");
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return GetIntInternal();
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}
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inline PRInt16
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nsAttrValue::GetEnumValue() const
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{
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NS_PRECONDITION(Type() == eEnum, "wrong type");
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// We don't need to worry about sign extension here since we're
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// returning an PRInt16 which will cut away the top bits.
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return static_cast<PRInt16>
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(GetIntInternal() >> NS_ATTRVALUE_ENUMTABLEINDEX_BITS);
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}
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inline float
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nsAttrValue::GetPercentValue() const
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{
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NS_PRECONDITION(Type() == ePercent, "wrong type");
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return static_cast<float>(GetIntInternal()) /
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100.0f;
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}
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inline nsCOMArray<nsIAtom>*
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nsAttrValue::GetAtomArrayValue() const
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{
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NS_PRECONDITION(Type() == eAtomArray, "wrong type");
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return GetMiscContainer()->mAtomArray;
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}
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inline nsICSSStyleRule*
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nsAttrValue::GetCSSStyleRuleValue() const
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{
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NS_PRECONDITION(Type() == eCSSStyleRule, "wrong type");
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return GetMiscContainer()->mCSSStyleRule;
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}
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#ifdef MOZ_SVG
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inline nsISVGValue*
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nsAttrValue::GetSVGValue() const
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{
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NS_PRECONDITION(Type() == eSVGValue, "wrong type");
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return GetMiscContainer()->mSVGValue;
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}
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#endif
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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
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nsAttrValue::SetPtrValueAndType(void* aValue, ValueBaseType aType)
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{
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NS_ASSERTION(!(NS_PTR_TO_INT32(aValue) & ~NS_ATTRVALUE_POINTERVALUE_MASK),
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"pointer not properly aligned, this will crash");
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mBits = reinterpret_cast<PtrBits>(aValue) | aType;
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}
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inline void
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nsAttrValue::SetIntValueAndType(PRInt32 aValue, ValueType aType)
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{
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#ifdef DEBUG
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{
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PRInt32 tmp = aValue * NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER;
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NS_ASSERTION(tmp / NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER == aValue,
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"Integer too big to fit");
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}
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#endif
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mBits = (aValue * NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER) | aType;
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}
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inline void
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nsAttrValue::ResetIfSet()
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{
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if (mBits) {
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Reset();
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}
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}
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inline void*
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nsAttrValue::GetPtr() const
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{
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NS_ASSERTION(BaseType() != eIntegerBase,
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"getting pointer from non-pointer");
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return reinterpret_cast<void*>(mBits & NS_ATTRVALUE_POINTERVALUE_MASK);
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}
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inline nsAttrValue::MiscContainer*
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nsAttrValue::GetMiscContainer() const
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{
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NS_ASSERTION(BaseType() == eOtherBase, "wrong type");
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return static_cast<MiscContainer*>(GetPtr());
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}
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inline PRInt32
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nsAttrValue::GetIntInternal() const
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{
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NS_ASSERTION(BaseType() == eIntegerBase,
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"getting integer from non-integer");
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// Make sure we get a signed value.
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// Lets hope the optimizer optimizes this into a shift. Unfortunatly signed
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// bitshift right is implementaion dependant.
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return static_cast<PRInt32>(mBits & ~NS_ATTRVALUE_INTEGERTYPE_MASK) /
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NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER;
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}
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inline PRBool
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nsAttrValue::IsEmptyString() const
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{
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return !mBits;
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}
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#endif
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