The Tor Browser / file comparison
comparison: layout/style/nsRuleWalker.h
layout/style/nsRuleWalker.h
- branch
- TOR_BUG_3246
- changeset 6
- 8bccb770b82d
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| -1:000000000000 | 0:60cbb680a112 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* | |
| 7 * a class that walks the lexicographic tree of rule nodes as style | |
| 8 * rules are matched | |
| 9 */ | |
| 10 | |
| 11 #ifndef nsRuleWalker_h_ | |
| 12 #define nsRuleWalker_h_ | |
| 13 | |
| 14 #include "nsRuleNode.h" | |
| 15 #include "nsIStyleRule.h" | |
| 16 #include "StyleRule.h" | |
| 17 | |
| 18 class nsRuleWalker { | |
| 19 public: | |
| 20 nsRuleNode* CurrentNode() { return mCurrent; } | |
| 21 void SetCurrentNode(nsRuleNode* aNode) { | |
| 22 NS_ASSERTION(aNode, "Must have node here!"); | |
| 23 mCurrent = aNode; | |
| 24 } | |
| 25 | |
| 26 protected: | |
| 27 void DoForward(nsIStyleRule* aRule) { | |
| 28 mCurrent = mCurrent->Transition(aRule, mLevel, mImportance); | |
| 29 NS_POSTCONDITION(mCurrent, "Transition messed up"); | |
| 30 } | |
| 31 | |
| 32 public: | |
| 33 void Forward(nsIStyleRule* aRule) { | |
| 34 NS_PRECONDITION(!nsRefPtr<mozilla::css::StyleRule>(do_QueryObject(aRule)), | |
| 35 "Calling the wrong Forward() overload"); | |
| 36 DoForward(aRule); | |
| 37 } | |
| 38 void Forward(mozilla::css::StyleRule* aRule) { | |
| 39 DoForward(aRule); | |
| 40 mCheckForImportantRules = | |
| 41 mCheckForImportantRules && !aRule->GetImportantRule(); | |
| 42 } | |
| 43 // ForwardOnPossiblyCSSRule should only be used by callers that have | |
| 44 // an explicit list of rules they need to walk, with the list | |
| 45 // already containing any important rules they care about. | |
| 46 void ForwardOnPossiblyCSSRule(nsIStyleRule* aRule) { | |
| 47 DoForward(aRule); | |
| 48 } | |
| 49 | |
| 50 void Reset() { mCurrent = mRoot; } | |
| 51 | |
| 52 bool AtRoot() { return mCurrent == mRoot; } | |
| 53 | |
| 54 void SetLevel(uint8_t aLevel, bool aImportance, | |
| 55 bool aCheckForImportantRules) { | |
| 56 NS_ASSERTION(!aCheckForImportantRules || !aImportance, | |
| 57 "Shouldn't be checking for important rules while walking " | |
| 58 "important rules"); | |
| 59 mLevel = aLevel; | |
| 60 mImportance = aImportance; | |
| 61 mCheckForImportantRules = aCheckForImportantRules; | |
| 62 } | |
| 63 uint8_t GetLevel() const { return mLevel; } | |
| 64 bool GetImportance() const { return mImportance; } | |
| 65 bool GetCheckForImportantRules() const { return mCheckForImportantRules; } | |
| 66 | |
| 67 bool AuthorStyleDisabled() const { return mAuthorStyleDisabled; } | |
| 68 | |
| 69 // We define the visited-relevant link to be the link that is the | |
| 70 // nearest self-or-ancestor to the node being matched. | |
| 71 enum VisitedHandlingType { | |
| 72 // Do rule matching as though all links are unvisited. | |
| 73 eRelevantLinkUnvisited, | |
| 74 // Do rule matching as though the relevant link is visited and all | |
| 75 // other links are unvisited. | |
| 76 eRelevantLinkVisited, | |
| 77 // Do rule matching as though a rule should match if it would match | |
| 78 // given any set of visitedness states. (used by users other than | |
| 79 // nsRuleWalker) | |
| 80 eLinksVisitedOrUnvisited | |
| 81 }; | |
| 82 | |
| 83 private: | |
| 84 nsRuleNode* mCurrent; // Our current position. Never null. | |
| 85 nsRuleNode* mRoot; // The root of the tree we're walking. | |
| 86 uint8_t mLevel; // an nsStyleSet::sheetType | |
| 87 bool mImportance; | |
| 88 bool mCheckForImportantRules; // If true, check for important rules as | |
| 89 // we walk and set to false if we find | |
| 90 // one. | |
| 91 bool mAuthorStyleDisabled; | |
| 92 | |
| 93 public: | |
| 94 nsRuleWalker(nsRuleNode* aRoot, bool aAuthorStyleDisabled) | |
| 95 : mCurrent(aRoot) | |
| 96 , mRoot(aRoot) | |
| 97 , mAuthorStyleDisabled(aAuthorStyleDisabled) | |
| 98 { | |
| 99 NS_ASSERTION(mCurrent, "Caller screwed up and gave us null node"); | |
| 100 MOZ_COUNT_CTOR(nsRuleWalker); | |
| 101 } | |
| 102 ~nsRuleWalker() { MOZ_COUNT_DTOR(nsRuleWalker); } | |
| 103 }; | |
| 104 | |
| 105 #endif /* !defined(nsRuleWalker_h_) */ |
