glib/docs/reference/gobject/glib-mkenums.xml

<refentry id="glib-mkenums" lang="en">

<refentryinfo>
  <title>gdbus</title>
  <productname>GObject</productname>
  <authorgroup>
    <author>
      <contrib>Developer</contrib>
      <firstname>Owen</firstname>
      <surname>Taylor</surname>
    </author>
  </authorgroup>
</refentryinfo>

<refmeta>
<refentrytitle>glib-mkenums</refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo class="manual">User Commands</refmiscinfo>
</refmeta>

<refnamediv>
<refname>glib-mkenums</refname>
<refpurpose>C language enum description generation utility</refpurpose>
</refnamediv>

<refsynopsisdiv>
<cmdsynopsis>
<command>glib-mkenums</command>
<arg choice="opt" rep="repeat">OPTION</arg>
<arg choice="opt" rep="repeat">FILE</arg>
</cmdsynopsis>
</refsynopsisdiv>

<refsect1><title>Description</title>
<para><command>glib-mkenums</command> is a small perl-script utility that
parses C code to extract enum definitions and produces enum descriptions based
on text templates specified by the user. Most frequently this script is used to
produce C code that contains enum values as strings so programs can provide
value name strings for introspection.
</para>

<para><command>glib-mkenums</command> takes a list of valid C code files as
input. The options specified control the text that is output, certain
substitutions are performed on the text templates for keywords enclosed
in @ characters.
</para>

<refsect2><title>Production text substitutions</title>
<para>
Certain keywords enclosed in @ characters will be substituted in the
emitted text. For the substitution examples of the keywords below,
the following example enum definition is assumed:
<informalexample><programlisting>
typedef enum
{
  PREFIX_THE_XVALUE    = 1 &lt;&lt; 3,
  PREFIX_ANOTHER_VALUE = 1 &lt;&lt; 4
} PrefixTheXEnum;
</programlisting></informalexample>
<variablelist>
<varlistentry>
<term>@EnumName@</term>
<listitem><para>
The name of the enum currently being processed, enum names are assumed to be
properly namespaced and to use mixed capitalization to separate
words (e.g. PrefixTheXEnum).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@enum_name@</term>
<listitem><para>
The enum name with words lowercase and word-separated by underscores
(e.g. prefix_the_xenum).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@ENUMNAME@</term>
<listitem><para>
The enum name with words uppercase and word-separated by underscores
(e.g. PREFIX_THE_XENUM).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@ENUMSHORT@</term>
<listitem><para>
The enum name with words uppercase and word-separated by underscores,
prefix stripped (e.g. THE_XENUM).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@ENUMPREFIX@</term>
<listitem><para>
The prefix of the enum name (e.g. PREFIX).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@VALUENAME@</term>
<listitem><para>
The enum value name currently being processed with words uppercase and
word-separated by underscores,
this is the assumed literal notation of enum values in the C sources
(e.g. PREFIX_THE_XVALUE).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@valuenick@</term>
<listitem><para>
A nick name for the enum value currently being processed, this is usually
generated by stripping common prefix words of all the enum values of the
current enum, the words are lowercase and underscores are substituted by a
minus (e.g. the-xvalue).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@valuenum@</term>
<listitem><para>
The integer value for the enum value currently being processed.  This is
calculated by using <command>perl</command> to attempt to evaluate the
expression as it appears in the C source code.  If evaluation fails then
<command>glib-mkenums</command> will exit with an error status, but this
only happens if <literal>@valuenum@</literal> appears in your value
production template.  (Since: 2.26)
</para></listitem>
</varlistentry>

<varlistentry>
<term>@type@</term>
<listitem><para>
This is substituted either by "enum" or "flags", depending on whether the
enum value definitions contained bit-shift operators or not (e.g. flags).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@Type@</term>
<listitem><para>
The same as <literal>@type@</literal> with the first letter capitalized (e.g. Flags).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@TYPE@</term>
<listitem><para>
The same as <literal>@type@</literal> with all letters uppercased (e.g. FLAGS).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@filename@</term>
<listitem><para>
The name of the input file currently being processed (e.g. foo.h).
</para></listitem>
</varlistentry>

<varlistentry>
<term>@basename@</term>
<listitem><para>
The base name of the input file currently being processed (e.g. foo.h). (Since: 2.22)
</para></listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2><title>Trigraph extensions</title>
<para>
Some C comments are treated specially in the parsed enum definitions,
such comments start out with the trigraph sequence <literal>/*&lt;</literal>
and end with the trigraph sequence <literal>&gt;*/</literal>.
Per enum definition, the options "skip" and "flags" can be specified, to
indicate this enum definition to be skipped, or for it to be treated as
a flags definition, or to specify the common prefix to be stripped from
all values to generate value nicknames, respectively. The "underscore_name"
option can be used to specify the word separation used in the *_get_type()
function. For instance, /*&lt; underscore_name=gnome_vfs_uri_hide_options &gt;*/.
</para>
<para>
Per value definition, the options "skip" and "nick" are supported.
The former causes the value to be skipped, and the latter can be used to
specify the otherwise auto-generated nickname.
Examples:
<informalexample><programlisting>
typedef enum /*&lt; skip &gt;*/
{
  PREFIX_FOO
} PrefixThisEnumWillBeSkipped;
typedef enum /*&lt; flags,prefix=PREFIX &gt;*/
{
  PREFIX_THE_ZEROTH_VALUE,	/*&lt; skip &gt;*/
  PREFIX_THE_FIRST_VALUE,
  PREFIX_THE_SECOND_VALUE,
  PREFIX_THE_THIRD_VALUE,	/*&lt; nick=the-last-value &gt;*/
} PrefixTheFlagsEnum;
</programlisting></informalexample>
</para>
</refsect2>
</refsect1>

<refsect1><title>Options</title>
<variablelist>

<varlistentry>
<term><option>--fhead</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> prior to processing input files.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--fprod</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> everytime a new input file
is being processed.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--ftail</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> after all input files have been
processed.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--eprod</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> everytime an enum is encountered
in the input files.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--vhead</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> before iterating over the set of
values of an enum.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--vprod</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> for every value of an enum.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--vtail</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Put out <replaceable>TEXT</replaceable> after iterating over all values
of an enum.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--comments</option> <replaceable>TEXT</replaceable></term>
<listitem><para>
Template for auto-generated comments, the default (for C code generations) is
<literal>"/* @comment@ */"</literal>.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--template</option> <replaceable>FILE</replaceable></term>
<listitem><para>
Read templates from the given file. The templates are enclosed in
specially-formatted C comments
<informalexample><programlisting>
/*** BEGIN section ***/
/*** END section ***/
</programlisting></informalexample>
where section may be <literal>file-header</literal>,
<literal>file-production</literal>, <literal>file-tail</literal>,
<literal>enumeration-production</literal>, <literal>value-header</literal>,
<literal>value-production</literal>, <literal>value-tail</literal> or
<literal>comment</literal>.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--identifier-prefix</option> <replaceable>PREFIX</replaceable></term>
<listitem><para>
Indicates what portion of the enum name should be intepreted as the
prefix (eg, the "<literal>Gtk</literal>" in
"<literal>GtkDirectionType</literal>"). Normally this will be figured
out automatically, but you may need to override the default if your
namespace is capitalized oddly.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--symbol-prefix</option> <replaceable>PREFIX</replaceable></term>
<listitem><para>
Indicates what prefix should be used to correspond to the identifier
prefix in related C function names (eg, the "<literal>gtk</literal>"
in "<literal>gtk_direction_type_get_type</literal>". Equivalently,
this is the lowercase version of the prefix component of the enum
value names (eg, the "<literal>GTK</literal>" in
"<literal>GTK_DIR_UP</literal>". The default value is the identifier
prefix, converted to lowercase.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--help</option></term>
<listitem><para>
Print brief help and exit.
</para></listitem>
</varlistentry>

<varlistentry>
<term><option>--version</option></term>
<listitem><para>
Print version and exit.
</para></listitem>
</varlistentry>

</variablelist>
</refsect1>

<refsect1><title>See also</title>
<para>
<citerefentry>
<refentrytitle>glib-genmarshal</refentrytitle>
<manvolnum>1</manvolnum>
</citerefentry>
</para>
</refsect1>
</refentry>