зеркало из https://github.com/mozilla/gecko-dev.git
520 строки
19 KiB
C++
520 строки
19 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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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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/* representation of simple property values within CSS declarations */
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#ifndef nsCSSValue_h___
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#define nsCSSValue_h___
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#include "nsColor.h"
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#include "nsString.h"
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#include "nsCoord.h"
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#include "nsCSSProperty.h"
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#include "nsIURI.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsCRTGlue.h"
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#include "nsStringBuffer.h"
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class imgIRequest;
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class nsIDocument;
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class nsIPrincipal;
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// Deletes a linked list iteratively to avoid blowing up the stack (bug 456196).
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#define NS_CSS_DELETE_LIST_MEMBER(type_, ptr_, member_) \
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{ \
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type_ *cur = (ptr_)->member_; \
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(ptr_)->member_ = nsnull; \
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while (cur) { \
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type_ *next = cur->member_; \
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cur->member_ = nsnull; \
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delete cur; \
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cur = next; \
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} \
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}
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// Clones a linked list iteratively to avoid blowing up the stack.
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// If it fails to clone the entire list then 'to_' is deleted and
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// we return null.
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#define NS_CSS_CLONE_LIST_MEMBER(type_, from_, member_, to_, args_) \
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{ \
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type_ *dest = (to_); \
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(to_)->member_ = nsnull; \
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for (const type_ *src = (from_)->member_; src; src = src->member_) { \
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type_ *clone = src->Clone args_; \
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if (!clone) { \
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delete (to_); \
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return nsnull; \
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} \
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dest->member_ = clone; \
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dest = clone; \
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} \
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}
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enum nsCSSUnit {
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eCSSUnit_Null = 0, // (n/a) null unit, value is not specified
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eCSSUnit_Auto = 1, // (n/a) value is algorithmic
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eCSSUnit_Inherit = 2, // (n/a) value is inherited
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eCSSUnit_Initial = 3, // (n/a) value is default UA value
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eCSSUnit_None = 4, // (n/a) value is none
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eCSSUnit_Normal = 5, // (n/a) value is normal (algorithmic, different than auto)
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eCSSUnit_System_Font = 6, // (n/a) value is -moz-use-system-font
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eCSSUnit_Dummy = 7, // (n/a) a fake but specified value, used
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// only in temporary values
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eCSSUnit_DummyInherit = 8, // (n/a) a fake but specified value, used
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// only in temporary values
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eCSSUnit_RectIsAuto = 9, // (n/a) 'auto' for an entire rect()
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eCSSUnit_String = 10, // (PRUnichar*) a string value
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eCSSUnit_Attr = 11, // (PRUnichar*) a attr(string) value
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eCSSUnit_Local_Font = 12, // (PRUnichar*) a local font name
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eCSSUnit_Font_Format = 13, // (PRUnichar*) a font format name
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eCSSUnit_Array = 20, // (nsCSSValue::Array*) a list of values
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eCSSUnit_Counter = 21, // (nsCSSValue::Array*) a counter(string,[string]) value
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eCSSUnit_Counters = 22, // (nsCSSValue::Array*) a counters(string,string[,string]) value
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eCSSUnit_Function = 23, // (nsCSSValue::Array*) a function with parameters. First elem of array is name,
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// the rest of the values are arguments.
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eCSSUnit_URL = 30, // (nsCSSValue::URL*) value
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eCSSUnit_Image = 31, // (nsCSSValue::Image*) value
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eCSSUnit_Integer = 50, // (int) simple value
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eCSSUnit_Enumerated = 51, // (int) value has enumerated meaning
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eCSSUnit_EnumColor = 80, // (int) enumerated color (kColorKTable)
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eCSSUnit_Color = 81, // (nscolor) an RGBA value
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eCSSUnit_Percent = 90, // (float) 1.0 == 100%) value is percentage of something
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eCSSUnit_Number = 91, // (float) value is numeric (usually multiplier, different behavior that percent)
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// Length units - fixed
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// US English
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eCSSUnit_Inch = 100, // (float) 0.0254 meters
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eCSSUnit_Foot = 101, // (float) 12 inches
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eCSSUnit_Mile = 102, // (float) 5280 feet
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// Metric
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eCSSUnit_Millimeter = 207, // (float) 1/1000 meter
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eCSSUnit_Centimeter = 208, // (float) 1/100 meter
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eCSSUnit_Meter = 210, // (float) Standard length
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eCSSUnit_Kilometer = 213, // (float) 1000 meters
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// US Typographic
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eCSSUnit_Point = 300, // (float) 1/72 inch
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eCSSUnit_Pica = 301, // (float) 12 points == 1/6 inch
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// European Typographic
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eCSSUnit_Didot = 400, // (float) 15 didots == 16 points
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eCSSUnit_Cicero = 401, // (float) 12 didots
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// Length units - relative
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// Font relative measure
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eCSSUnit_EM = 800, // (float) == current font size
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eCSSUnit_XHeight = 801, // (float) distance from top of lower case x to baseline
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eCSSUnit_Char = 802, // (float) number of characters, used for width with monospace font
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eCSSUnit_RootEM = 803, // (float) == root element font size
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// Screen relative measure
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eCSSUnit_Pixel = 900, // (float) CSS pixel unit
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// Angular units
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eCSSUnit_Degree = 1000, // (float) 360 per circle
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eCSSUnit_Grad = 1001, // (float) 400 per circle
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eCSSUnit_Radian = 1002, // (float) 2*pi per circle
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// Frequency units
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eCSSUnit_Hertz = 2000, // (float) 1/seconds
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eCSSUnit_Kilohertz = 2001, // (float) 1000 Hertz
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// Time units
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eCSSUnit_Seconds = 3000, // (float) Standard time
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eCSSUnit_Milliseconds = 3001 // (float) 1/1000 second
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};
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class nsCSSValue {
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public:
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struct Array;
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friend struct Array;
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struct URL;
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friend struct URL;
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struct Image;
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friend struct Image;
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// for valueless units only (null, auto, inherit, none, normal)
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explicit nsCSSValue(nsCSSUnit aUnit = eCSSUnit_Null)
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: mUnit(aUnit)
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{
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NS_ASSERTION(aUnit <= eCSSUnit_RectIsAuto, "not a valueless unit");
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}
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nsCSSValue(PRInt32 aValue, nsCSSUnit aUnit) NS_HIDDEN;
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nsCSSValue(float aValue, nsCSSUnit aUnit) NS_HIDDEN;
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nsCSSValue(const nsString& aValue, nsCSSUnit aUnit) NS_HIDDEN;
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explicit nsCSSValue(nscolor aValue) NS_HIDDEN;
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nsCSSValue(Array* aArray, nsCSSUnit aUnit) NS_HIDDEN;
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explicit nsCSSValue(URL* aValue) NS_HIDDEN;
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explicit nsCSSValue(Image* aValue) NS_HIDDEN;
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nsCSSValue(const nsCSSValue& aCopy) NS_HIDDEN;
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~nsCSSValue() { Reset(); }
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NS_HIDDEN_(nsCSSValue&) operator=(const nsCSSValue& aCopy);
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NS_HIDDEN_(PRBool) operator==(const nsCSSValue& aOther) const;
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PRBool operator!=(const nsCSSValue& aOther) const
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{
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return !(*this == aOther);
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}
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nsCSSUnit GetUnit() const { return mUnit; }
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PRBool IsLengthUnit() const
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{ return eCSSUnit_Inch <= mUnit && mUnit <= eCSSUnit_Pixel; }
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PRBool IsFixedLengthUnit() const
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{ return eCSSUnit_Inch <= mUnit && mUnit <= eCSSUnit_Cicero; }
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PRBool IsRelativeLengthUnit() const
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{ return eCSSUnit_EM <= mUnit && mUnit <= eCSSUnit_Pixel; }
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PRBool IsAngularUnit() const
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{ return eCSSUnit_Degree <= mUnit && mUnit <= eCSSUnit_Radian; }
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PRBool IsFrequencyUnit() const
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{ return eCSSUnit_Hertz <= mUnit && mUnit <= eCSSUnit_Kilohertz; }
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PRBool IsTimeUnit() const
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{ return eCSSUnit_Seconds <= mUnit && mUnit <= eCSSUnit_Milliseconds; }
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PRBool UnitHasStringValue() const
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{ return eCSSUnit_String <= mUnit && mUnit <= eCSSUnit_Font_Format; }
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PRInt32 GetIntValue() const
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{
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NS_ASSERTION(mUnit == eCSSUnit_Integer || mUnit == eCSSUnit_Enumerated ||
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mUnit == eCSSUnit_EnumColor,
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"not an int value");
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return mValue.mInt;
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}
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float GetPercentValue() const
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{
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NS_ASSERTION(mUnit == eCSSUnit_Percent, "not a percent value");
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return mValue.mFloat;
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}
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float GetFloatValue() const
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{
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NS_ASSERTION(eCSSUnit_Number <= mUnit, "not a float value");
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return mValue.mFloat;
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}
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nsAString& GetStringValue(nsAString& aBuffer) const
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{
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NS_ASSERTION(UnitHasStringValue(), "not a string value");
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aBuffer.Truncate();
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PRUint32 len = NS_strlen(GetBufferValue(mValue.mString));
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mValue.mString->ToString(len, aBuffer);
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return aBuffer;
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}
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const PRUnichar* GetStringBufferValue() const
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{
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NS_ASSERTION(UnitHasStringValue(), "not a string value");
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return GetBufferValue(mValue.mString);
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}
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nscolor GetColorValue() const
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{
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NS_ASSERTION((mUnit == eCSSUnit_Color), "not a color value");
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return mValue.mColor;
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}
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Array* GetArrayValue() const
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{
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NS_ASSERTION(eCSSUnit_Array <= mUnit && mUnit <= eCSSUnit_Function,
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"not an array value");
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return mValue.mArray;
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}
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nsIURI* GetURLValue() const
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{
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NS_ASSERTION(mUnit == eCSSUnit_URL || mUnit == eCSSUnit_Image,
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"not a URL value");
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return mUnit == eCSSUnit_URL ?
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mValue.mURL->mURI : mValue.mImage->mURI;
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}
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URL* GetURLStructValue() const
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{
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// Not allowing this for Image values, because if the caller takes
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// a ref to them they won't be able to delete them properly.
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NS_ASSERTION(mUnit == eCSSUnit_URL, "not a URL value");
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return mValue.mURL;
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}
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const PRUnichar* GetOriginalURLValue() const
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{
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NS_ASSERTION(mUnit == eCSSUnit_URL || mUnit == eCSSUnit_Image,
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"not a URL value");
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return GetBufferValue(mUnit == eCSSUnit_URL ?
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mValue.mURL->mString :
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mValue.mImage->mString);
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}
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// Not making this inline because that would force us to include
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// imgIRequest.h, which leads to REQUIRES hell, since this header is included
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// all over.
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NS_HIDDEN_(imgIRequest*) GetImageValue() const;
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NS_HIDDEN_(nscoord) GetLengthTwips() const;
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NS_HIDDEN_(void) Reset() // sets to null
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{
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if (mUnit != eCSSUnit_Null)
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DoReset();
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}
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private:
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NS_HIDDEN_(void) DoReset();
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public:
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NS_HIDDEN_(void) SetIntValue(PRInt32 aValue, nsCSSUnit aUnit);
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NS_HIDDEN_(void) SetPercentValue(float aValue);
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NS_HIDDEN_(void) SetFloatValue(float aValue, nsCSSUnit aUnit);
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NS_HIDDEN_(void) SetStringValue(const nsString& aValue, nsCSSUnit aUnit);
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NS_HIDDEN_(void) SetColorValue(nscolor aValue);
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NS_HIDDEN_(void) SetArrayValue(nsCSSValue::Array* aArray, nsCSSUnit aUnit);
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NS_HIDDEN_(void) SetURLValue(nsCSSValue::URL* aURI);
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NS_HIDDEN_(void) SetImageValue(nsCSSValue::Image* aImage);
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NS_HIDDEN_(void) SetAutoValue();
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NS_HIDDEN_(void) SetInheritValue();
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NS_HIDDEN_(void) SetInitialValue();
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NS_HIDDEN_(void) SetNoneValue();
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NS_HIDDEN_(void) SetNormalValue();
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NS_HIDDEN_(void) SetSystemFontValue();
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NS_HIDDEN_(void) SetDummyValue();
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NS_HIDDEN_(void) SetDummyInheritValue();
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NS_HIDDEN_(void) SetRectIsAutoValue();
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NS_HIDDEN_(void) StartImageLoad(nsIDocument* aDocument)
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const; // Not really const, but pretending
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// Returns an already addrefed buffer. Can return null on allocation
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// failure.
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static nsStringBuffer* BufferFromString(const nsString& aValue);
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struct URL {
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// Methods are not inline because using an nsIPrincipal means requiring
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// caps, which leads to REQUIRES hell, since this header is included all
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// over.
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// aString must not be null.
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// aOriginPrincipal must not be null.
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URL(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
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nsIPrincipal* aOriginPrincipal) NS_HIDDEN;
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~URL() NS_HIDDEN;
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NS_HIDDEN_(PRBool) operator==(const URL& aOther) const;
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// URIEquals only compares URIs and principals (unlike operator==, which
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// also compares the original strings). URIEquals also assumes that the
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// mURI member of both URL objects is non-null. Do NOT call this method
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// unless you're sure this is the case.
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NS_HIDDEN_(PRBool) URIEquals(const URL& aOther) const;
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nsCOMPtr<nsIURI> mURI; // null == invalid URL
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nsStringBuffer* mString; // Could use nsRefPtr, but it'd add useless
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// null-checks; this is never null.
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nsCOMPtr<nsIURI> mReferrer;
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nsCOMPtr<nsIPrincipal> mOriginPrincipal;
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void AddRef() {
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if (mRefCnt == PR_UINT32_MAX) {
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NS_WARNING("refcount overflow, leaking nsCSSValue::URL");
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return;
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}
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++mRefCnt;
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}
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void Release() {
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if (mRefCnt == PR_UINT32_MAX) {
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NS_WARNING("refcount overflow, leaking nsCSSValue::URL");
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return;
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}
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if (--mRefCnt == 0)
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delete this;
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}
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protected:
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nsrefcnt mRefCnt;
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};
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struct Image : public URL {
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// Not making the constructor and destructor inline because that would
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// force us to include imgIRequest.h, which leads to REQUIRES hell, since
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// this header is included all over.
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// aString must not be null.
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Image(nsIURI* aURI, nsStringBuffer* aString, nsIURI* aReferrer,
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nsIPrincipal* aOriginPrincipal, nsIDocument* aDocument) NS_HIDDEN;
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~Image() NS_HIDDEN;
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// Inherit operator== from nsCSSValue::URL
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nsCOMPtr<imgIRequest> mRequest; // null == image load blocked or somehow failed
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// Override Release so we delete correctly without a virtual destructor
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void Release() {
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if (mRefCnt == PR_UINT32_MAX) {
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NS_WARNING("refcount overflow, leaking nsCSSValue::Image");
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return;
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}
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if (--mRefCnt == 0)
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delete this;
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}
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};
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private:
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static const PRUnichar* GetBufferValue(nsStringBuffer* aBuffer) {
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return static_cast<PRUnichar*>(aBuffer->Data());
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}
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protected:
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nsCSSUnit mUnit;
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union {
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PRInt32 mInt;
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float mFloat;
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// Note: the capacity of the buffer may exceed the length of the string.
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// If we're of a string type, mString is not null.
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nsStringBuffer* mString;
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nscolor mColor;
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Array* mArray;
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URL* mURL;
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Image* mImage;
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} mValue;
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};
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struct nsCSSValue::Array {
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// return |Array| with reference count of zero
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static Array* Create(PRUint16 aItemCount) {
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return new (aItemCount) Array(aItemCount);
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}
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nsCSSValue& operator[](PRUint16 aIndex) {
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NS_ASSERTION(aIndex < mCount, "out of range");
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return mArray[aIndex];
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}
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const nsCSSValue& operator[](PRUint16 aIndex) const {
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NS_ASSERTION(aIndex < mCount, "out of range");
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return mArray[aIndex];
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}
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nsCSSValue& Item(PRUint16 aIndex) { return (*this)[aIndex]; }
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const nsCSSValue& Item(PRUint16 aIndex) const { return (*this)[aIndex]; }
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PRUint16 Count() const { return mCount; }
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PRBool operator==(const Array& aOther) const
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{
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if (mCount != aOther.mCount)
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return PR_FALSE;
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for (PRUint16 i = 0; i < mCount; ++i)
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if ((*this)[i] != aOther[i])
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return PR_FALSE;
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return PR_TRUE;
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}
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void AddRef() {
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if (mRefCnt == PR_UINT16_MAX) {
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NS_WARNING("refcount overflow, leaking nsCSSValue::Array");
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return;
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}
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++mRefCnt;
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NS_LOG_ADDREF(this, mRefCnt, "nsCSSValue::Array", sizeof(*this));
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}
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void Release() {
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if (mRefCnt == PR_UINT16_MAX) {
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NS_WARNING("refcount overflow, leaking nsCSSValue::Array");
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return;
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}
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--mRefCnt;
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NS_LOG_RELEASE(this, mRefCnt, "nsCSSValue::Array");
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if (mRefCnt == 0)
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delete this;
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}
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private:
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PRUint16 mRefCnt;
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const PRUint16 mCount;
|
|
// This must be the last sub-object, since we extend this array to
|
|
// be of size mCount; it needs to be a sub-object so it gets proper
|
|
// alignment.
|
|
nsCSSValue mArray[1];
|
|
|
|
void* operator new(size_t aSelfSize, PRUint16 aItemCount) CPP_THROW_NEW {
|
|
NS_ABORT_IF_FALSE(aItemCount > 0, "cannot have a 0 item count");
|
|
return ::operator new(aSelfSize + sizeof(nsCSSValue) * (aItemCount - 1));
|
|
}
|
|
|
|
void operator delete(void* aPtr) { ::operator delete(aPtr); }
|
|
|
|
nsCSSValue* First() { return mArray; }
|
|
|
|
const nsCSSValue* First() const { return mArray; }
|
|
|
|
#define CSSVALUE_LIST_FOR_EXTRA_VALUES(var) \
|
|
for (nsCSSValue *var = First() + 1, *var##_end = First() + mCount; \
|
|
var != var##_end; ++var)
|
|
|
|
Array(PRUint16 aItemCount)
|
|
: mRefCnt(0)
|
|
, mCount(aItemCount)
|
|
{
|
|
MOZ_COUNT_CTOR(nsCSSValue::Array);
|
|
CSSVALUE_LIST_FOR_EXTRA_VALUES(val) {
|
|
new (val) nsCSSValue();
|
|
}
|
|
}
|
|
|
|
~Array()
|
|
{
|
|
MOZ_COUNT_DTOR(nsCSSValue::Array);
|
|
CSSVALUE_LIST_FOR_EXTRA_VALUES(val) {
|
|
val->~nsCSSValue();
|
|
}
|
|
}
|
|
|
|
#undef CSSVALUE_LIST_FOR_EXTRA_VALUES
|
|
|
|
private:
|
|
Array(const Array& aOther); // not to be implemented
|
|
};
|
|
|
|
#endif /* nsCSSValue_h___ */
|
|
|