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