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comparison: layout/style/CSSVariableResolver.h
layout/style/CSSVariableResolver.h
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| 1 /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ | |
| 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 /* object that resolves CSS variables using specified and inherited variable | |
| 7 * values | |
| 8 */ | |
| 9 | |
| 10 #ifndef mozilla_CSSVariableResolver_h | |
| 11 #define mozilla_CSSVariableResolver_h | |
| 12 | |
| 13 #include "mozilla/DebugOnly.h" | |
| 14 #include "nsCSSParser.h" | |
| 15 #include "nsCSSScanner.h" | |
| 16 #include "nsDataHashtable.h" | |
| 17 #include "nsTArray.h" | |
| 18 | |
| 19 namespace mozilla { | |
| 20 | |
| 21 class CSSVariableDeclarations; | |
| 22 class CSSVariableValues; | |
| 23 class EnumerateVariableReferencesData; | |
| 24 | |
| 25 class CSSVariableResolver | |
| 26 { | |
| 27 friend class CSSVariableDeclarations; | |
| 28 friend class CSSVariableValues; | |
| 29 friend class EnumerateVariableReferencesData; | |
| 30 public: | |
| 31 /** | |
| 32 * Creates a new CSSVariableResolver that will output a set of resolved, | |
| 33 * computed variables into aOutput. | |
| 34 */ | |
| 35 CSSVariableResolver(CSSVariableValues* aOutput) | |
| 36 : mOutput(aOutput) | |
| 37 , mResolved(false) | |
| 38 { | |
| 39 MOZ_ASSERT(aOutput); | |
| 40 } | |
| 41 | |
| 42 /** | |
| 43 * Resolves the set of inherited variables from aInherited and the | |
| 44 * set of specified variables from aSpecified. The resoled variables | |
| 45 * are written in to mOutput. | |
| 46 */ | |
| 47 void Resolve(const CSSVariableValues* aInherited, | |
| 48 const CSSVariableDeclarations* aSpecified); | |
| 49 | |
| 50 private: | |
| 51 struct Variable | |
| 52 { | |
| 53 Variable(const nsAString& aVariableName, | |
| 54 nsString aValue, | |
| 55 nsCSSTokenSerializationType aFirstToken, | |
| 56 nsCSSTokenSerializationType aLastToken, | |
| 57 bool aWasInherited) | |
| 58 : mVariableName(aVariableName) | |
| 59 , mValue(aValue) | |
| 60 , mFirstToken(aFirstToken) | |
| 61 , mLastToken(aLastToken) | |
| 62 , mWasInherited(aWasInherited) | |
| 63 , mResolved(false) | |
| 64 , mReferencesNonExistentVariable(false) | |
| 65 , mInStack(false) | |
| 66 , mIndex(0) | |
| 67 , mLowLink(0) { } | |
| 68 | |
| 69 nsString mVariableName; | |
| 70 nsString mValue; | |
| 71 nsCSSTokenSerializationType mFirstToken; | |
| 72 nsCSSTokenSerializationType mLastToken; | |
| 73 | |
| 74 // Whether this variable came from the set of inherited variables. | |
| 75 bool mWasInherited; | |
| 76 | |
| 77 // Whether this variable has been resolved yet. | |
| 78 bool mResolved; | |
| 79 | |
| 80 // Whether this variables includes any references to non-existent variables. | |
| 81 bool mReferencesNonExistentVariable; | |
| 82 | |
| 83 // Bookkeeping for the cycle remover algorithm. | |
| 84 bool mInStack; | |
| 85 size_t mIndex; | |
| 86 size_t mLowLink; | |
| 87 }; | |
| 88 | |
| 89 /** | |
| 90 * Adds or modifies an existing entry in the set of variables to be resolved. | |
| 91 * This is intended to be called by the AddVariablesToResolver functions on | |
| 92 * the CSSVariableDeclarations and CSSVariableValues objects passed in to | |
| 93 * Resolve. | |
| 94 * | |
| 95 * @param aName The variable name (not including any "--" prefix that would | |
| 96 * be part of the custom property name) whose value is to be set. | |
| 97 * @param aValue The variable value. | |
| 98 * @param aFirstToken The type of token at the start of the variable value. | |
| 99 * @param aLastToken The type of token at the en of the variable value. | |
| 100 * @param aWasInherited Whether this variable came from the set of inherited | |
| 101 * variables. | |
| 102 */ | |
| 103 void Put(const nsAString& aVariableName, | |
| 104 nsString aValue, | |
| 105 nsCSSTokenSerializationType aFirstToken, | |
| 106 nsCSSTokenSerializationType aLastToken, | |
| 107 bool aWasInherited); | |
| 108 | |
| 109 // Helper functions for Resolve. | |
| 110 void RemoveCycles(size_t aID); | |
| 111 void ResolveVariable(size_t aID); | |
| 112 | |
| 113 // A mapping of variable names to an ID that indexes into mVariables | |
| 114 // and mReferences. | |
| 115 nsDataHashtable<nsStringHashKey, size_t> mVariableIDs; | |
| 116 | |
| 117 // The set of variables. | |
| 118 nsTArray<Variable> mVariables; | |
| 119 | |
| 120 // The list of variables that each variable references. | |
| 121 nsTArray<nsTArray<size_t> > mReferences; | |
| 122 | |
| 123 // The next index to assign to a variable found during the cycle removing | |
| 124 // algorithm's traversal of the variable reference graph. | |
| 125 size_t mNextIndex; | |
| 126 | |
| 127 // Stack of variable IDs that we push to as we traverse the variable reference | |
| 128 // graph while looking for cycles. Variable::mInStack reflects whether a | |
| 129 // given variable has its ID in mStack. | |
| 130 nsTArray<size_t> mStack; | |
| 131 | |
| 132 // CSS parser to use for parsing property values with variable references. | |
| 133 nsCSSParser mParser; | |
| 134 | |
| 135 // The object to output the resolved variables into. | |
| 136 CSSVariableValues* mOutput; | |
| 137 | |
| 138 // Whether Resolve has been called. | |
| 139 DebugOnly<bool> mResolved; | |
| 140 }; | |
| 141 | |
| 142 } | |
| 143 | |
| 144 #endif |
