/usr/lib/x86_64-linux-gnu/gstreamermm-1.0/gen/m4/plugingen_base.m4 is in libgstreamermm-1.0-dev 1.4.3+dfsg-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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divert(-1)
dnl
dnl Macros to translate from C to C++ types.
dnl
dnl __HASH variable borrowed form glibmm's convert_base.m4 file
define(`__HASH',`__`'translit(`$*',`ABCDEFGHIJKLMNOPQRSTUVWXYZ<>[]&*, ',`abcdefghijklmnopqrstuvwxyzVBNMRSC_')`'')
dnl _CAMEL_TO_UNDERSCORE(GtkWidget) -> gtk_widget. Adapted from glibmm's
dnl _GET_TYPE_FUNC() macro (see glibmm's convert_base.m4 file for docs).
define(`_CAMEL_TO_UNDERSCORE',`dnl
translit(substr(patsubst(patsubst(`$1',`[A-Z][A-Z]+',`_\&'),`[A-Z][a-z]',`_\&'),1),`[A-Z]',`[a-z]')`'dnl
')
dnl _GET_TYPE_FUNC(GtkWidget) -> gtk_widget_get_type(). Borrowed from glibmm's convert_base.m4 file (see glibmm's m4 file for docs).
define(`_GET_TYPE_FUNC',`dnl
_CAMEL_TO_UNDERSCORE($1)_get_type()`'dnl
')
dnl Macro to insert left quote
define(`_LQ',`changequote(<,>)`dnl'
changequote`'')
dnl Macro to insert right quote
define(`_RQ',`changequote(<,>)dnl`
'changequote`'')
dnl _TRANSLATION(ctype, cpptype, param cpptype, return cpptype, cppinclude)
dnl
dnl Records a translation from a C type to a C++ type. If a return cpptype is
dnl not given, it is assumed to be the same as the param cpptype. A cpp
dnl include need not be specified (the <> or "" are required though). If an
dnl include is specified, a C++ include directive may be generated with the
dnl _TRANSLATION_INCLUDE macro.
dnl
define(`_TRANSLATION',`dnl
define(`TFT'__HASH(`$1'),`$2')dnl
define(`TFP'__HASH(`$1'),`$3')dnl
ifelse(`$4',,`dnl
define(`TFR'__HASH(`$1'),`$3')',`dnl
define(`TFR'__HASH(`$1'),`$4')dnl
')`'dnl
ifelse(`$5',,,`define(`IF'__HASH(`$1'),`$5')')`'dnl
')dnl
dnl _TRANSLATION_INCLUDE(ctype)
dnl
dnl Produces a C++ include direcive of the C++ header for the ctype if a
dnl translation has been defined and an include parameter was included. Only
dnl one directive will be generated for multiple calls (i.e. none but the first
dnl call produces anything).
dnl
define(`_TRANSLATION_INCLUDE',`dnl
ifdef(`IFC'__HASH(`$1'),,`dnl
ifdef(`IF'__HASH(`$1'),`dnl
#include indir(`IF'__HASH(`$1'))
dnl
define(`IFC'__HASH(`$1'))dnl
')`'dnl
')`'dnl
')dnl
dnl _TRANSLATE(ctype, translation type)
dnl
dnl Translates from a specified C type to a C++ type, param or return type.
dnl `translation type' may be:
dnl `type' - For a C to C++ type translation.
dnl `param' - For a C to C++ parameter translation.
dnl `return' - For a C to C++ return translation.
dnl
define(`_TRANSLATE',`dnl
ifelse(dnl
`$2',`type',`dnl
ifdef(`TFT'__HASH(`$1'), `indir(`TFT'__HASH(`$1'))',`dnl
errprint(`No C++ type translation from $1 is defined.
')`'dnl
m4exit(1)`'dnl
')',dnl
`$2',`param',`dnl
ifdef(`TFP'__HASH(`$1'), `indir(`TFP'__HASH(`$1'))',`dnl
errprint(`No C++ parameter translation from $1 is defined.
')`'dnl
m4exit(1)`'dnl
')',dnl
`$2',`return',`dnl
ifdef(`TFR'__HASH(`$1'), `indir(`TFR'__HASH(`$1'))',`dnl
ifdef(`TFP'__HASH(`$1'), `indir(`TFP'__HASH(`$1'))',`dnl
errprint(`No C++ return translation from $1 is defined.
')`'dnl
m4exit(1)`'dnl
')`'dnl
')`'dnl
')`'dnl
')dnl
dnl _ENUM_IS_WRAPPED(CEnumType)
dnl
dnl Used to tell when an enum has been wrapped. When a _WRAP_PLUGIN_ENUM() is
dnl used to wrap enums used in plug-ins, the enum will be wrapped only if it
dnl hasn't been flagged as wrapped by this macro.
dnl
define(`_ENUM_IS_WRAPPED',`dnl
define(`EIW'__HASH(`$1'))dnl
')dnl
dnl _WRAP_PLUGIN_ENUM(prefix, CppEnumType)
dnl
dnl Attempts to generate a _WRAP_ENUM() and a _TRANSLATION() macro for an enum
dnl used by a plug-in. If the enum has been flagged as wrapped by the
dnl _ENUM_IS_WRAPPED() macro nothing will be generated.
define(`_WRAP_PLUGIN_ENUM',`dnl
ifdef(`EIW'__HASH(`$1$2'),,`dnl
_TRANSLATION(`$1$2',`$1::$2',`$1::$2')dnl
_WRAP_ENUM($2,$1$2)
_CONV_ENUM($1,$2)
_ENUM_IS_WRAPPED($1$2)dnl
')`'dnl
')dnl
dnl _PLUGIN_ENUM_GET_TYPE_FUNC(CEnumType)
dnl
dnl Attempts to generate a *_get_type() function for an enum specific to a
dnl plug-in. If the enum has been flagged as wrapped by the
dnl _ENUM_IS_WRAPPED() macro it is taken taken to be a non-plugin enum and
dnl nothing will be generated. Only one function is generated no matter how
dnl many times the macro is used.
define(`_PLUGIN_ENUM_GET_TYPE_FUNC',`dnl
ifdef(`EIW'__HASH(`$1'),,`dnl
ifdef(`EGTF'__HASH(`$1'),,`dnl
static GType _GET_TYPE_FUNC($1)
{
static GType const type = g_type_from_name("$1");
return type;
}
define(`EGTF'__HASH(`$1'))dnl
')`'dnl
')`'dnl
')dnl
dnl _C_ENUM_VALUES(CAPS_UNDERSCORE_C_ENUM_TYPE, nick1, val1, nick2, val2, ...)
dnl
dnl Generates the enum values of a C enum definition from the C enum type name
dnl and the list of nicknames and values of the enum. The enum type name must
dnl be converted from camel to caps/underscore format.
define(`_C_ENUM_VALUES',`dnl
ifelse(eval(`$# < 3'),`1',,eval(`$# == 3'),`1',`dnl
$1_`'translit(translit(`$2',`a-z',`A-Z'),`-',`_') = $3
',`dnl
$1_`'translit(translit(`$2',`a-z',`A-Z'),`-',`_') = $3,
_C_ENUM_VALUES(`$1',shift(shift(shift($@))))dnl
')`'dnl
')dnl
dnl _C_ENUM_DEFINITION(CEnumType, nick1, val1, nick2, val2, ...)
dnl
dnl Generates a C enum definition from the C enum type name and the list of
dnl nicknames and values of the enum if the enum has not been flagged as
dnl wrapped with the _ENUM_IS_WRAPPED() macro. Only one definition is
dnl generated per multiple calls.
define(`_C_ENUM_DEFINITION',`dnl
ifdef(`EIW'__HASH(`$1'),,`dnl
ifdef(`CED'__HASH(`$1'),,`dnl
enum $1
{
_C_ENUM_VALUES(translit(_CAMEL_TO_UNDERSCORE(`$1'),`a-z',`A-Z'),shift($@))dnl
};
define(`CED'__HASH(`$1'))dnl
')`'dnl
')`'dnl
')dnl
#Basic C to C++ translations
_TRANSLATION(`void',`void',`void')
_TRANSLATION(`gboolean',`bool',`bool')
_TRANSLATION(`gint',`int',`int')
_TRANSLATION(`guint',`guint',`guint')
_TRANSLATION(`gulong',`gulong',`gulong')
_TRANSLATION(`gint64',`gint64',`gint64')
_TRANSLATION(`guint64',`guint64',`guint64')
_TRANSLATION(`gfloat',`float',`float')
_TRANSLATION(`gdouble',`double',`double')
#String C to C++ translations
_TRANSLATION(`gchararray',`Glib::ustring',`const Glib::ustring&',`Glib::ustring')
include(plugingen.m4)
divert(0)dnl
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