[slang-users] Generating ruby bindings to s-lang using swig

["Jacob Grydholt Jensen" <grydholt@xxxxxxxxx>]

Hi,

I would like to make ruby bindings to s-lang with swig. I am a newbie
at both s-lang and swig and my C is rusty, so please point me to
appropriate documentation
if I haven't done my homework properly.

I have created a slang.i file with the following content:

  %module slang
   %{
   /* Includes the header in the wrapper code */
   #include "/usr/local/include/slang.h"
   %}

   /* Parse the header file to generate wrappers */
   %include "/usr/local/include/slang.h"

And I run it as:

  $ swig -ruby slang.i
  /usr/local/include/slang.h:422: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:438: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:449: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:459: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:469: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:480: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:491: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:514: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:523: Warning(314): 'next' is a ruby
keyword, and it will renamed as 'C_next'
  /usr/local/include/slang.h:539: Error: Syntax error in input(1).
  /usr/local/include/slang.h:1432: Warning(454): Setting a
pointer/reference variable may leak memory.

I notice that swig reports an error in line 539, but it still
generates a slang_wrap.c file, which I try to compile with:

  $ gcc slang_wrap.c -I/usr/local/include
-I/usr/local/lib/ruby/1.8/arm-openbsd3.9
  slang_wrap.c: In function `field_name_get':
  slang_wrap.c:7309: error: `field_name' undeclared (first use in this function)
  slang_wrap.c:7309: error: (Each undeclared identifier is reported only once
  slang_wrap.c:7309: error: for each function it appears in.)
  slang_wrap.c: In function `field_name_set':
  slang_wrap.c:7322: error: `field_name' undeclared (first use in this function)
  slang_wrap.c: In function `offset_get':
  slang_wrap.c:7339: error: `offset' undeclared (first use in this function)
  slang_wrap.c: In function `offset_set':
  slang_wrap.c:7352: error: `offset' undeclared (first use in this function)
  slang_wrap.c: In function `type_get':
  slang_wrap.c:7364: error: `type' undeclared (first use in this function)
  slang_wrap.c: In function `type_set':
  slang_wrap.c:7377: error: `type' undeclared (first use in this function)
  slang_wrap.c: In function `read_only_get':
  slang_wrap.c:7389: error: `read_only' undeclared (first use in this function)
  slang_wrap.c: In function `read_only_set':
  slang_wrap.c:7402: error: `read_only' undeclared (first use in this function)

So obviously something went wrong. I guess the errors are related so I
will concentrate on the first with field_name. The file slang_wrap.c
has the following content in lines 7305 - 7312:

  SWIGINTERN VALUE
  field_name_get(VALUE self) {
    VALUE _val;

    _val = SWIG_FromCharPtr(field_name);
    return _val;
  }

I am running the following versions:

  $swig -version
  SWIG Version 1.3.29

  Compiled with g++ [zaurus-unknown-openbsd3.9]
  Please see http://www.swig.org for reporting bugs and further information

  $slsh --version
  slsh version 0.7.5-0
  S-Lang Library Version: 2.0.6

  $ ruby --version
  ruby 1.8.4 (2005-12-24) [arm-openbsd3.9]

--
/grydholt

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