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256 lines
8.5 KiB
256 lines
8.5 KiB
/**
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\page kconfig_compiler The KDE Configuration Compiler
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kconfig_compiler generates C++ source code from an XML file containing
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information about configuration options (.kcfg) and a file that provides
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the code generation options (.kcfgc) The generated class is based on
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KConfigSkeleton and provides an API for the application to access its
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configuration data.
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<h2>XML description of the configuration options</h2>
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The structure of the .kcfg file is described by its DTD kcfg.dtd.
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The \<kcfgfile\> tag tqcontains the name of the configuration file described.
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Omitting the name will make the generated class use the default configuration
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file ("<appname>rc").
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The \<include\> tags are optional and may contain C++ header files that
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are needed to compile the code needed to compute default values.
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The remaining entries in the XML file are grouped by the tag \<group\>
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which describes the corresponding group in the configuration file.
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The individual entries must have at least a name or a key. The name is used to
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create accessor and modifier functions. It's also used as the key in the config
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file. If \<key\> is given, but not \<name\>, the name is constructed by removing
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all spaces from \<key\>.
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An entry must also have a type. The list of allowable types is
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specified in the DTD and loosely follows the list of types supported
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by the QVariant with exception of the clearly binary types
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(e.g. Pixmap, Image...) which are not supported. Besides those basic
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type the following special types are supported:
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- Path This is a string that is specially treated as a file-path.
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In particular paths in the home directory are prefixed with $HOME in
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when being stored in the configuration file.
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- Enum This indicates an enumeration. The possible enum values should
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be provided via the \<choices\> tag. Enum values are accessed as integers
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by the application but stored as string in the configuration file. This
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makes it possible to add more values at a later date without breaking
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compatibility.
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- IntList This indicates a list of integers. This information is provided
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to the application as QValueList<int>. Useful for storing QSplitter
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geometries.
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An entry can optionally have a default value which is used as default when
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the value isn't specified in any config file. Default values are interpreted
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as literal constant values. If a default value needs to be computed
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or if it needs to be obtained from a function call, the \<default\> tag
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should contain the code="true" attribute. The contents of the \<default\>
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tag is then considered to be a C++ expression. Note that in this case you
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might have to add an \<include\> tag as described above so that the code
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which computes the default value can be compiled.
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Additional code for computing default values can be provided via
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the \<code\> tag. The contents of the \<code\> tag is inserted as-is. A
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typical use for this is to compute a common default value which can
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then be referenced by multiple entries that follow.
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<h2>Code generation options</h2>
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The options for generating the C++ sources are read from the file with the
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extension .kcfgc. To generate a class add the corresponding kcfgc file to the
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SOURCES line in the Makefile.am.
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The following options are read from the kcfgc file:
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<table>
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<tr>
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<td><b><i>Name</i></b></td>
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<td><b><i>Type</i></b></td>
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<td><b><i>Default</i></b></td>
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<td><b><i>Description</i></b></td>
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</tr>
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<tr>
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<td><b>File</b></td>
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<td>string</td>
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<td>programname.kcfg</td>
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<td>Name of kcfg file containing the options the class is generated for</td>
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</tr>
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<tr>
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<td><b>NameSpace</b></td>
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<td>string</td>
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<td>-</td>
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<td>Optional namespace for generated class</td>
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</tr>
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<tr>
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<td><b>ClassName</b></td>
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<td>string</td>
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<td>-</td>
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<td>Name of generated class (required)</td>
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</tr>
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<tr>
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<td><b>Inherits</b></td>
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<td>string</td>
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<td>KConfigSkeleton</td>
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<td>Class the generated class inherits from. This class must inherit
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KConfigSkeleton.</td>
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</tr>
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<tr>
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<td><b>Visibility</b></td>
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<td>string</td>
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<td>-</td>
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<td>Inserts visibility directive (for example KDE_EXPORT) between "class" keyword and class
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name in header file</td>
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</tr>
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<tr>
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<td><b>Singleton</b></td>
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<td>bool</td>
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<td>false</td>
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<td>Generated class is a singleton.</td>
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</tr>
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<tr>
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<td><b>CustomAdditions</b></td>
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<td>bool</td>
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<td>-</td>
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<td></td>
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</tr>
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<tr>
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<td><b>MemberVariables</b></td>
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<td>string: public|protected|private</td>
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<td>private</td>
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<td>C++ access modifier used for memeber variables holding the configuration
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valuse</td>
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</tr>
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<tr>
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<td><b>IncludeFiles</b></td>
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<td>comma separated list of strings</td>
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<td>-</td>
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<td>Names of files to be included in the header of the generated class</td>
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</tr>
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<tr>
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<td><b>Mutators</b></td>
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<td>true, false or a comma seperated list of options</td>
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<td>-</td>
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<td>If true, mutator functions for all configuration options are generated.
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If false, no mutator functions are generated. If a list is provided,
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mutator functions are generated for the options that are listed.</td>
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</tr>
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<tr>
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<td><b>ItemAccessors</b></td>
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<td>bool</td>
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<td>false</td>
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<td>Generate accessor functions for the KConfigSkeletonItem objects
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corresponding to the configuration options. If <b>SetUserTexts</b> is set,
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<b>ItemAccessors</b> also has to be set.</td>
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</tr>
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<tr>
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<td><b>SetUserTexts</b></td>
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<td>bool</td>
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<td>false</td>
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<td>Set the label and whatthis texts of the items from the kcfg file.If
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<b>SetUserTexts</b> is set, <b>ItemAccessors</b> also has to be set.</td>
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</tr>
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<tr>
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<td><b>GlobalEnums</b></td>
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<td>bool</td>
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<td>false</td>
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<td>If set to true all choices of Enum items will be created in the global
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scope of the generated class. If set to false, each Enum item will get an own
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namespace for its choices.</td>
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</tr>
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</table>
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<h2>Advanced options</h2>
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There are several possibilities to parameterize entries.
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- Parameterized entries
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An entry can be parameterized using a fixed range parameter specified with
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the \<parameter\> tag. Such parameter can either be an Enum or an int. An Enum
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parameter should specify the possible enumeration values with the \<choices\>
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tag. An int parameter should specify its maximum value. Its minimum value
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is always 0.
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A parameterized entry is expanded to a number of entries, one for each
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value in the parameter range. The name and key should contain a reference
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to the parameter in the form of $(parameter-name). When expanding the entries
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the $(parameter-name) part is tqreplaced with the value of the parameter.
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In the case of an Enum parameter it is tqreplaced with the name of the
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enumuration value. In the case of an int parameter it is tqreplaced with
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the numeric value of the parameter.
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Parameterized entries all share the same default value unless different
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default values have been specified for specific parameter values.
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This can be done with the param= attribute of the \<default\>. When a
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param attribute is specified the default value only applies to that
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particular parameter value.
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Example 1:
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\verbatim
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<entry name="Color$(ColorIndex)" type="Color" key="color_$(ColorIndex)">
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<parameter name="ColorIndex" type="Int" max="3"/>
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<default param="0">#ff0000</default>
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<default param="1">#00ff00</default>
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<default param="2">#0000ff</default>
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<default param="3">#ffff00</default>
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</entry>
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\endverbatim
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The above describes 4 color configuration entries with the following defaults:
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\verbatim
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color_0=#ff0000
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color_1=#00ff00
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color_2=#0000ff
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color_3=#ffff00
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\endverbatim
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The configuration options will be accessible to the application via
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a QColor color(int ColorIndex) and a
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void setColor(int ColorIndex, const QColor &v) function.
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Example 2:
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\verbatim
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<entry name="Sound$(SoundEvent)" type="String" key="sound_$(SoundEvent)">
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<parameter name="SoundEvent" type="Enum">
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<values>
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<value>Explosion</value>
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<value>Crash</value>
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<value>Missile</value>
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</values>
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</parameter>
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<default param="Explosion">boom.wav</default>
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<default param="Crash">crash.wav</default>
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<default param="Missile">missile.wav</default>
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</entry>
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\endverbatim
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The above describes 3 string configuration entries with the following defaults:
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sound_Explosion=boom.wav
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sound_Crash=crash.wav
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sound_Missile=missile.wav
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The configuration options will be accessible to the application via
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a QString sound(int SoundEvent) and a
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void setSound(int SoundEvent, const QString &v) function.
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- Parameterized groups
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...STILL TODO...
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If you have questions or comments please contact Cornelius Schumacher
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<schumacher@kde.org> or Waldo Bastian <bastian@kde.org>
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*/
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