зеркало из https://github.com/mozilla/pjs.git
276 строки
9.3 KiB
C++
276 строки
9.3 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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* Daniel Glazman <glazman@netscape.com>
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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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/*
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* representation of a declaration block (or style attribute) in a CSS
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* stylesheet
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*/
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#ifndef mozilla_css_Declaration_h
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#define mozilla_css_Declaration_h
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// This header is in EXPORTS because it's used in several places in content/,
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// but it's not really a public interface.
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#ifndef _IMPL_NS_LAYOUT
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#error "This file should only be included within the layout library"
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#endif
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#include "nsCSSDataBlock.h"
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#include "nsCSSProperty.h"
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#include "nsCSSProps.h"
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#include "nsStringFwd.h"
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#include "nsTArray.h"
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#include <stdio.h>
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namespace mozilla {
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namespace css {
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// Declaration objects have unusual lifetime rules. Every declaration
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// begins life in an invalid state which ends when InitializeEmpty or
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// CompressFrom is called upon it. After that, it can be attached to
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// exactly one style rule, and will be destroyed when that style rule
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// is destroyed. A declaration becomes immutable when its style rule's
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// |RuleMatched| method is called; after that, it must be copied before
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// it can be modified, which is taken care of by |EnsureMutable|.
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class Declaration {
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public:
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/**
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* Construct an |Declaration| that is in an invalid state (null
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* |mData|) and cannot be used until its |CompressFrom| method or
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* |InitializeEmpty| method is called.
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*/
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Declaration();
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Declaration(const Declaration& aCopy);
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~Declaration();
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/**
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* |ValueAppended| must be called to maintain this declaration's
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* |mOrder| whenever a property is parsed into an expanded data block
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* for this declaration. aProperty must not be a shorthand.
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*/
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void ValueAppended(nsCSSProperty aProperty);
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void RemoveProperty(nsCSSProperty aProperty);
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PRBool HasProperty(nsCSSProperty aProperty) const;
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void GetValue(nsCSSProperty aProperty, nsAString& aValue) const;
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PRBool HasImportantData() const { return mImportantData != nsnull; }
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PRBool GetValueIsImportant(nsCSSProperty aProperty) const;
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PRBool GetValueIsImportant(const nsAString& aProperty) const;
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PRUint32 Count() const {
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return mOrder.Length();
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}
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void GetNthProperty(PRUint32 aIndex, nsAString& aReturn) const;
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void ToString(nsAString& aString) const;
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nsCSSCompressedDataBlock* GetNormalBlock() const { return mData; }
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nsCSSCompressedDataBlock* GetImportantBlock() const { return mImportantData; }
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/**
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* Initialize this declaration as holding no data. Cannot fail.
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*/
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void InitializeEmpty();
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/**
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* Transfer all of the state from |aExpandedData| into this declaration.
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* After calling, |aExpandedData| should be in its initial state.
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*/
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void CompressFrom(nsCSSExpandedDataBlock *aExpandedData) {
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NS_ABORT_IF_FALSE(!mData, "oops");
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NS_ABORT_IF_FALSE(!mImportantData, "oops");
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aExpandedData->Compress(getter_Transfers(mData),
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getter_Transfers(mImportantData));
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aExpandedData->AssertInitialState();
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}
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/**
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* Transfer all of the state from this declaration into
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* |aExpandedData| and put this declaration temporarily into an
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* invalid state (ended by |CompressFrom| or |InitializeEmpty|) that
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* should last only during parsing. During this time only
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* |ValueAppended| should be called.
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*/
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void ExpandTo(nsCSSExpandedDataBlock *aExpandedData) {
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AssertMutable();
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aExpandedData->AssertInitialState();
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NS_ABORT_IF_FALSE(mData, "oops");
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aExpandedData->Expand(mData.forget(), mImportantData.forget());
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}
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/**
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* Do what |nsIStyleRule::MapRuleInfoInto| needs to do for a style
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* rule using this declaration for storage.
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*/
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void MapNormalRuleInfoInto(nsRuleData *aRuleData) const {
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NS_ABORT_IF_FALSE(mData, "called while expanded");
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mData->MapRuleInfoInto(aRuleData);
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}
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void MapImportantRuleInfoInto(nsRuleData *aRuleData) const {
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NS_ABORT_IF_FALSE(mData, "called while expanded");
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NS_ABORT_IF_FALSE(mImportantData, "must have important data");
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mImportantData->MapRuleInfoInto(aRuleData);
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}
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/**
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* Attempt to replace the value for |aProperty| stored in this
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* declaration with the matching value from |aFromBlock|.
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* This method may only be called on a mutable declaration.
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* It will fail (returning PR_FALSE) if |aProperty| is shorthand,
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* is not already in this declaration, or does not have the indicated
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* importance level. If it returns PR_TRUE, it erases the value in
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* |aFromBlock|. |aChanged| is set to PR_TRUE if the declaration
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* changed as a result of the call, and to PR_FALSE otherwise.
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*/
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PRBool TryReplaceValue(nsCSSProperty aProperty, PRBool aIsImportant,
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nsCSSExpandedDataBlock& aFromBlock,
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PRBool* aChanged)
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{
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AssertMutable();
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NS_ABORT_IF_FALSE(mData, "called while expanded");
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if (nsCSSProps::IsShorthand(aProperty)) {
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*aChanged = PR_FALSE;
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return PR_FALSE;
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}
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nsCSSCompressedDataBlock *block = aIsImportant ? mImportantData : mData;
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// mImportantData might be null
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if (!block) {
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*aChanged = PR_FALSE;
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return PR_FALSE;
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}
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#ifdef DEBUG
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{
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nsCSSCompressedDataBlock *other = aIsImportant ? mData : mImportantData;
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NS_ABORT_IF_FALSE(!other || !other->ValueFor(aProperty) ||
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!block->ValueFor(aProperty),
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"Property both important and not?");
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}
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#endif
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return block->TryReplaceValue(aProperty, aFromBlock, aChanged);
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}
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PRBool HasNonImportantValueFor(nsCSSProperty aProperty) const {
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty), "must be longhand");
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return !!mData->ValueFor(aProperty);
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}
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/**
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* Return whether |this| may be modified.
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*/
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bool IsMutable() const {
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return !mImmutable;
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}
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/**
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* Copy |this|, if necessary to ensure that it can be modified.
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*/
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Declaration* EnsureMutable();
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/**
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* Crash if |this| cannot be modified.
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*/
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void AssertMutable() const {
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NS_ABORT_IF_FALSE(IsMutable(), "someone forgot to call EnsureMutable");
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}
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/**
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* Mark this declaration as unmodifiable. It's 'const' so it can
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* be called from ToString.
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*/
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void SetImmutable() const { mImmutable = PR_TRUE; }
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/**
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* Clear the data, in preparation for its replacement with entirely
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* new data by a call to |CompressFrom|.
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*/
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void ClearData() {
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AssertMutable();
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mData = nsnull;
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mImportantData = nsnull;
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mOrder.Clear();
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}
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#ifdef DEBUG
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void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
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#endif
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private:
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// Not implemented, and not supported.
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Declaration& operator=(const Declaration& aCopy);
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PRBool operator==(const Declaration& aCopy) const;
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static void AppendImportanceToString(PRBool aIsImportant, nsAString& aString);
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// return whether there was a value in |aValue| (i.e., it had a non-null unit)
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PRBool AppendValueToString(nsCSSProperty aProperty, nsAString& aResult) const;
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// Helper for ToString with strange semantics regarding aValue.
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void AppendPropertyAndValueToString(nsCSSProperty aProperty,
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nsAutoString& aValue,
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nsAString& aResult) const;
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nsCSSProperty OrderValueAt(PRUint32 aValue) const {
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return nsCSSProperty(mOrder.ElementAt(aValue));
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}
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nsAutoTArray<PRUint8, 8> mOrder;
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// never null, except while expanded, or before the first call to
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// InitializeEmpty or CompressFrom.
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nsAutoPtr<nsCSSCompressedDataBlock> mData;
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// may be null
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nsAutoPtr<nsCSSCompressedDataBlock> mImportantData;
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// set by style rules when |RuleMatched| is called;
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// also by ToString (hence the 'mutable').
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mutable PRPackedBool mImmutable;
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};
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} // namespace css
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} // namespace mozilla
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#endif /* mozilla_css_Declaration_h */
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