The Tor Browser: layout/style/CSSVariableValues.h@925c144e1f1f

     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/. */

     6 /* computed CSS Variable values */

     8 #ifndef mozilla_CSSVariableValues_h

     9 #define mozilla_CSSVariableValues_h

    11 #include "nsCSSScanner.h"

    12 #include "nsDataHashtable.h"

    13 #include "nsTArray.h"

    15 namespace mozilla {

    17 class CSSVariableResolver;

    19 class CSSVariableValues

    20 {

    21 public:

    22   CSSVariableValues();

    23   CSSVariableValues(const CSSVariableValues& aOther);

    24 #ifdef DEBUG

    25   ~CSSVariableValues();

    26 #endif

    27   CSSVariableValues& operator=(const CSSVariableValues& aOther);

    29   bool operator==(const CSSVariableValues& aOther) const;

    30   bool operator!=(const CSSVariableValues& aOther) const

    31     { return !(*this == aOther); }

    33   /**

    34    * Gets the value of a variable in this set of computed variables.

    35    *

    36    * @param aName The variable name (not including any "--" prefix that would

    37    *   be part of the custom property name).

    38    * @param aValue Out parameter into which the value of the variable will

    39    *   be stored.

    40    * @return Whether a variable with the given name was found.  When false

    41    *   is returned, aValue will not be modified.

    42    */

    43   bool Get(const nsAString& aName, nsString& aValue) const;

    45   /**

    46    * Gets the value of a variable in this set of computed variables, along

    47    * with information on the types of tokens that appear at the start and

    48    * end of the token stream.

    49    *

    50    * @param aName The variable name (not including any "--" prefix that would

    51    *   be part of the custom property name).

    52    * @param aValue Out parameter into which the value of the variable will

    53    *   be stored.

    54    * @param aFirstToken The type of token at the start of the variable value.

    55    * @param aLastToken The type of token at the en of the variable value.

    56    * @return Whether a variable with the given name was found.  When false

    57    *   is returned, aValue, aFirstToken and aLastToken will not be modified.

    58    */

    59   bool Get(const nsAString& aName,

    60            nsString& aValue,

    61            nsCSSTokenSerializationType& aFirstToken,

    62            nsCSSTokenSerializationType& aLastToken) const;

    64   /**

    65    * Gets the name of the variable at the given index.

    66    *

    67    * Variables on this object are ordered, and that order is just determined

    68    * based on the order that they are added to the object.  A consistent

    69    * ordering is required for CSSDeclaration objects in the DOM.

    70    * CSSDeclarations expose property names as indexed properties, which need to

    71    * be stable.

    72    *

    73    * @param aIndex The index of the variable to get.

    74    * @param aName Out parameter into which the name of the variable will be

    75    *   stored.

    76    */

    77   void GetVariableAt(size_t aIndex, nsAString& aName) const;

    79   /**

    80    * Gets the number of variables stored on this object.

    81    */

    82   size_t Count() const;

    84   /**

    85    * Adds or modifies an existing entry in this set of variable values.

    86    *

    87    * @param aName The variable name (not including any "--" prefix that would

    88    *   be part of the custom property name) whose value is to be set.

    89    * @param aValue The variable value.

    90    * @param aFirstToken The type of token at the start of the variable value.

    91    * @param aLastToken The type of token at the en of the variable value.

    92    */

    93   void Put(const nsAString& aName,

    94            nsString aValue,

    95            nsCSSTokenSerializationType aFirstToken,

    96            nsCSSTokenSerializationType aLastToken);

    98   /**

    99    * Copies the variables from this object into aResolver, marking them as

   100    * computed, inherited values.

   101    */

   102   void AddVariablesToResolver(CSSVariableResolver* aResolver) const;

   104 private:

   105   struct Variable

   106   {

   107     Variable()

   108       : mFirstToken(eCSSTokenSerialization_Nothing)

   109       , mLastToken(eCSSTokenSerialization_Nothing)

   110     {}

   112     Variable(const nsAString& aVariableName,

   113              nsString aValue,

   114              nsCSSTokenSerializationType aFirstToken,

   115              nsCSSTokenSerializationType aLastToken)

   116       : mVariableName(aVariableName)

   117       , mValue(aValue)

   118       , mFirstToken(aFirstToken)

   119       , mLastToken(aLastToken)

   120     {}

   122     nsString mVariableName;

   123     nsString mValue;

   124     nsCSSTokenSerializationType mFirstToken;

   125     nsCSSTokenSerializationType mLastToken;

   126   };

   128   /**

   129    * Adds all the variables from aOther into this object.

   130    */

   131   void CopyVariablesFrom(const CSSVariableValues& aOther);

   133   /**

   134    * Map of variable names to IDs.  Variable IDs are indexes into

   135    * mVariables.

   136    */

   137   nsDataHashtable<nsStringHashKey, size_t> mVariableIDs;

   139   /**

   140    * Array of variables, indexed by variable ID.

   141    */

   142   nsTArray<Variable> mVariables;

   143 };

   145 } // namespace mozilla

   147 #endif

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