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106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* a class that walks the lexicographic tree of rule nodes as style
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* rules are matched
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*/
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#ifndef nsRuleWalker_h_
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#define nsRuleWalker_h_
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#include "nsRuleNode.h"
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#include "nsIStyleRule.h"
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#include "StyleRule.h"
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class nsRuleWalker {
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public:
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nsRuleNode* CurrentNode() { return mCurrent; }
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void SetCurrentNode(nsRuleNode* aNode) {
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NS_ASSERTION(aNode, "Must have node here!");
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mCurrent = aNode;
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}
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protected:
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void DoForward(nsIStyleRule* aRule) {
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mCurrent = mCurrent->Transition(aRule, mLevel, mImportance);
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NS_POSTCONDITION(mCurrent, "Transition messed up");
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}
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public:
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void Forward(nsIStyleRule* aRule) {
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NS_PRECONDITION(!nsRefPtr<mozilla::css::StyleRule>(do_QueryObject(aRule)),
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"Calling the wrong Forward() overload");
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DoForward(aRule);
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}
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void Forward(mozilla::css::StyleRule* aRule) {
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DoForward(aRule);
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mCheckForImportantRules =
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mCheckForImportantRules && !aRule->GetImportantRule();
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}
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// ForwardOnPossiblyCSSRule should only be used by callers that have
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// an explicit list of rules they need to walk, with the list
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// already containing any important rules they care about.
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void ForwardOnPossiblyCSSRule(nsIStyleRule* aRule) {
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DoForward(aRule);
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}
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void Reset() { mCurrent = mRoot; }
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bool AtRoot() { return mCurrent == mRoot; }
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void SetLevel(uint8_t aLevel, bool aImportance,
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bool aCheckForImportantRules) {
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NS_ASSERTION(!aCheckForImportantRules || !aImportance,
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"Shouldn't be checking for important rules while walking "
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"important rules");
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mLevel = aLevel;
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mImportance = aImportance;
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mCheckForImportantRules = aCheckForImportantRules;
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}
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uint8_t GetLevel() const { return mLevel; }
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bool GetImportance() const { return mImportance; }
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bool GetCheckForImportantRules() const { return mCheckForImportantRules; }
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bool AuthorStyleDisabled() const { return mAuthorStyleDisabled; }
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// We define the visited-relevant link to be the link that is the
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// nearest self-or-ancestor to the node being matched.
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enum VisitedHandlingType {
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// Do rule matching as though all links are unvisited.
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eRelevantLinkUnvisited,
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// Do rule matching as though the relevant link is visited and all
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// other links are unvisited.
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eRelevantLinkVisited,
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// Do rule matching as though a rule should match if it would match
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// given any set of visitedness states. (used by users other than
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// nsRuleWalker)
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eLinksVisitedOrUnvisited
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};
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private:
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nsRuleNode* mCurrent; // Our current position. Never null.
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nsRuleNode* mRoot; // The root of the tree we're walking.
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uint8_t mLevel; // an nsStyleSet::sheetType
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bool mImportance;
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bool mCheckForImportantRules; // If true, check for important rules as
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// we walk and set to false if we find
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// one.
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bool mAuthorStyleDisabled;
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public:
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nsRuleWalker(nsRuleNode* aRoot, bool aAuthorStyleDisabled)
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: mCurrent(aRoot)
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, mRoot(aRoot)
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, mAuthorStyleDisabled(aAuthorStyleDisabled)
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{
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NS_ASSERTION(mCurrent, "Caller screwed up and gave us null node");
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MOZ_COUNT_CTOR(nsRuleWalker);
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}
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~nsRuleWalker() { MOZ_COUNT_DTOR(nsRuleWalker); }
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};
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#endif /* !defined(nsRuleWalker_h_) */
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