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ExtUtils::Typemaps(3pm)Perl Programmers Reference GuideExtUtils::Typemaps(3pm)




NAME

       ExtUtils::Typemaps - Read/Write/Modify Perl/XS typemap files


SYNOPSIS

         # read/create file
         my $typemap = ExtUtils::Typemaps->new(file => 'typemap');
         # alternatively create an in-memory typemap
         # $typemap = ExtUtils::Typemaps->new();
         # alternatively create an in-memory typemap by parsing a string
         # $typemap = ExtUtils::Typemaps->new(string => $sometypemap);

         # add a mapping
         $typemap->add_typemap(ctype => 'NV', xstype => 'T_NV');
         $typemap->add_inputmap(
            xstype => 'T_NV', code => '$var = ($type)SvNV($arg);'
         );
         $typemap->add_outputmap(
            xstype => 'T_NV', code => 'sv_setnv($arg, (NV)$var);'
         );
         $typemap->add_string(string => $typemapstring);
                                                  # will be parsed and merged

         # remove a mapping (same for remove_typemap and remove_outputmap...)
         $typemap->remove_inputmap(xstype => 'SomeType');

         # save a typemap to a file
         $typemap->write(file => 'anotherfile.map');

         # merge the other typemap into this one
         $typemap->merge(typemap => $another_typemap);


DESCRIPTION

       This module can read, modify, create and write Perl XS typemap files.
       If you don't know what a typemap is, please confer the perlxstut and
       perlxs manuals.

       The module is not entirely round-trip safe: For example it currently
       simply strips all comments.  The order of entries in the maps is,
       however, preserved.

       We check for duplicate entries in the typemap, but do not check for
       missing "TYPEMAP" entries for "INPUTMAP" or "OUTPUTMAP" entries since
       these might be hidden in a different typemap.


METHODS

   new
       Returns a new typemap object. Takes an optional "file" parameter.  If
       set, the given file will be read. If the file doesn't exist, an empty
       typemap is returned.

       Alternatively, if the "string" parameter is given, the supplied string
       will be parsed instead of a file.

   file
       Get/set the file that the typemap is written to when the "write" method
       is called.

   add_typemap
       Add a "TYPEMAP" entry to the typemap.

       Required named arguments: The "ctype" (e.g. "ctype => 'double'") and
       the "xstype" (e.g. "xstype => 'T_NV'").

       Optional named arguments: "replace => 1" forces removal/replacement of
       existing "TYPEMAP" entries of the same "ctype". "skip => 1" triggers a
       "first come first serve" logic by which new entries that conflict with
       existing entries are silently ignored.

       As an alternative to the named parameters usage, you may pass in an
       "ExtUtils::Typemaps::Type" object as first argument, a copy of which
       will be added to the typemap. In that case, only the "replace" or
       "skip" named parameters may be used after the object. Example:

         $map->add_typemap($type_obj, replace => 1);

   add_inputmap
       Add an "INPUT" entry to the typemap.

       Required named arguments: The "xstype" (e.g. "xstype => 'T_NV'") and
       the "code" to associate with it for input.

       Optional named arguments: "replace => 1" forces removal/replacement of
       existing "INPUT" entries of the same "xstype". "skip => 1" triggers a
       "first come first serve" logic by which new entries that conflict with
       existing entries are silently ignored.

       As an alternative to the named parameters usage, you may pass in an
       "ExtUtils::Typemaps::InputMap" object as first argument, a copy of
       which will be added to the typemap. In that case, only the "replace" or
       "skip" named parameters may be used after the object. Example:

         $map->add_inputmap($type_obj, replace => 1);

   add_outputmap
       Add an "OUTPUT" entry to the typemap.  Works exactly the same as
       "add_inputmap".

   add_string
       Parses a string as a typemap and merge it into the typemap object.

       Required named argument: "string" to specify the string to parse.

   remove_typemap
       Removes a "TYPEMAP" entry from the typemap.

       Required named argument: "ctype" to specify the entry to remove from
       the typemap.

       Alternatively, you may pass a single "ExtUtils::Typemaps::Type" object.

   remove_inputmap
       Removes an "INPUT" entry from the typemap.

       Required named argument: "xstype" to specify the entry to remove from
       the typemap.

       Alternatively, you may pass a single "ExtUtils::Typemaps::InputMap"
       object.

   remove_inputmap
       Removes an "OUTPUT" entry from the typemap.

       Required named argument: "xstype" to specify the entry to remove from
       the typemap.

       Alternatively, you may pass a single "ExtUtils::Typemaps::OutputMap"
       object.

   get_typemap
       Fetches an entry of the TYPEMAP section of the typemap.

       Mandatory named arguments: The "ctype" of the entry.

       Returns the "ExtUtils::Typemaps::Type" object for the entry if found.

   get_inputmap
       Fetches an entry of the INPUT section of the typemap.

       Mandatory named arguments: The "xstype" of the entry or the "ctype" of
       the typemap that can be used to find the "xstype". To wit, the
       following pieces of code are equivalent:

         my $type = $typemap->get_typemap(ctype => $ctype)
         my $input_map = $typemap->get_inputmap(xstype => $type->xstype);

         my $input_map = $typemap->get_inputmap(ctype => $ctype);

       Returns the "ExtUtils::Typemaps::InputMap" object for the entry if
       found.

   get_outputmap
       Fetches an entry of the OUTPUT section of the typemap.

       Mandatory named arguments: The "xstype" of the entry or the "ctype" of
       the typemap that can be used to resolve the "xstype". (See above for an
       example.)

       Returns the "ExtUtils::Typemaps::InputMap" object for the entry if
       found.

   write
       Write the typemap to a file. Optionally takes a "file" argument. If
       given, the typemap will be written to the specified file. If not, the
       typemap is written to the currently stored file name (see "file" above,
       this defaults to the file it was read from if any).

   as_string
       Generates and returns the string form of the typemap.

   as_embedded_typemap
       Generates and returns the string form of the typemap with the
       appropriate prefix around it for verbatim inclusion into an XS file as
       an embedded typemap. This will return a string like

         TYPEMAP: <<END_OF_TYPEMAP
         ... typemap here (see as_string) ...
         END_OF_TYPEMAP

       The method takes care not to use a HERE-doc end marker that appears in
       the typemap string itself.

   merge
       Merges a given typemap into the object. Note that a failed merge
       operation leaves the object in an inconsistent state so clone it if
       necessary.

       Mandatory named arguments: Either "typemap => $another_typemap_obj" or
       "file => $path_to_typemap_file" but not both.

       Optional arguments: "replace => 1" to force replacement of existing
       typemap entries without warning or "skip => 1" to skip entries that
       exist already in the typemap.

   is_empty
       Returns a bool indicating whether this typemap is entirely empty.

   list_mapped_ctypes
       Returns a list of the C types that are mappable by this typemap object.

   _get_typemap_hash
       Returns a hash mapping the C types to the XS types:

         {
           'char **' => 'T_PACKEDARRAY',
           'bool_t' => 'T_IV',
           'AV *' => 'T_AVREF',
           'InputStream' => 'T_IN',
           'double' => 'T_DOUBLE',
           # ...
         }

       This is documented because it is used by "ExtUtils::ParseXS", but it's
       not intended for general consumption. May be removed at any time.

   _get_inputmap_hash
       Returns a hash mapping the XS types (identifiers) to the corresponding
       INPUT code:

         {
           'T_CALLBACK' => '   $var = make_perl_cb_$type($arg)
         ',
           'T_OUT' => '    $var = IoOFP(sv_2io($arg))
         ',
           'T_REF_IV_PTR' => '   if (sv_isa($arg, \\"${ntype}\\")) {
           # ...
         }

       This is documented because it is used by "ExtUtils::ParseXS", but it's
       not intended for general consumption. May be removed at any time.

   _get_outputmap_hash
       Returns a hash mapping the XS types (identifiers) to the corresponding
       OUTPUT code:

         {
           'T_CALLBACK' => '   sv_setpvn($arg, $var.context.value().chp(),
                       $var.context.value().size());
         ',
           'T_OUT' => '    {
                   GV *gv = newGVgen("$Package");
                   if ( do_open(gv, "+>&", 3, FALSE, 0, 0, $var) )
                       sv_setsv(
                         $arg,
                         sv_bless(newRV((SV*)gv), gv_stashpv("$Package",1))
                       );
                   else
                       $arg = &PL_sv_undef;
                }
         ',
           # ...
         }

       This is documented because it is used by "ExtUtils::ParseXS", but it's
       not intended for general consumption. May be removed at any time.

   _get_prototype_hash
       Returns a hash mapping the C types of the typemap to their
       corresponding prototypes.

         {
           'char **' => '$',
           'bool_t' => '$',
           'AV *' => '$',
           'InputStream' => '$',
           'double' => '$',
           # ...
         }

       This is documented because it is used by "ExtUtils::ParseXS", but it's
       not intended for general consumption. May be removed at any time.

   clone
       Creates and returns a clone of a full typemaps object.

       Takes named parameters: If "shallow" is true, the clone will share the
       actual individual type/input/outputmap objects, but not share their
       storage. Use with caution. Without "shallow", the clone will be fully
       independent.

   tidy_type
       Function to (heuristically) canonicalize a C type. Works to some degree
       with C++ types.

           $halfway_canonical_type = tidy_type($ctype);

       Moved from "ExtUtils::ParseXS".


CAVEATS

       Inherits some evil code from "ExtUtils::ParseXS".


SEE ALSO

       The parser is heavily inspired from the one in ExtUtils::ParseXS(3).

       For details on typemaps: perlxstut(1), perlxs(1).


AUTHOR

       Steffen Mueller "<smueller@cpan.org">


COPYRIGHT & LICENSE

       Copyright 2009, 2010, 2011, 2012, 2013 Steffen Mueller

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.



perl v5.26.1                      2017-07-18           ExtUtils::Typemaps(3pm)

perl 5.26.1 - Generated Sun Nov 5 09:06:49 CST 2017
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