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/* mp4h-javascript -- a JavaScript extension to mp4h
Copyright 2001, Anders Dinsen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
*/
#define MP4H_MODULE
#include <mp4h.h>
#undef MP4H_MODULE
#include <js.h>
#include "mp4h-njs.h"
#define mp4h_macro_table njs_LTX_mp4h_macro_table
#define mp4h_init_module njs_LTX_mp4h_init_module
#define mp4h_finish_module njs_LTX_mp4h_finish_module
DECLARE(mp4m_javascript_njs); /* declare javascript as implementing a builtin */
#undef DECLARE
int output_func(void *, unsigned char *, unsigned int);
/* The table of builtins defined by this module - just one */
builtin mp4h_macro_table[] =
{
/* name container expand function
attributes */
{ "javascript", TRUE, TRUE, mp4m_javascript_njs },
{ 0, FALSE, FALSE, 0 },
};
static JSInterpPtr interp = NULL;
static JSInterpPtr
create_interp ()
{
JSInterpOptions options;
JSInterpPtr interp;
js_init_default_options (&options);
/* Use our own stdout handler (stderr and stdin are left
untouched. */
options.s_stdout = output_func;
/* XXX should stdin be /dev/null? */
interp = js_create_interp (&options);
if (interp == NULL) {
MP4HERROR ((warning_status, 0,
_("Warning:%s:%d: could'nt create interpreter\n%s"),
CURRENT_FILE_LINE));
return (NULL);
}
/* And finally, initialise the mp4h module. */
mp4h_MP4H(interp->vm);
return interp;
}
/* obs holds a pointer to the current obstack for output. It is
initialised from the argument to the javascript tag. */
static struct obstack *javascript_obs;
/* An output function that is put in place of the ordinary stdout
handler */
int
output_func(void *context, unsigned char *buffer, unsigned int amount)
{
obstack_grow(javascript_obs, buffer, amount);
return 0;
}
void
mp4h_init_module(struct obstack *obs)
{
if ( interp == NULL )
interp = create_interp();
}
void
mp4h_finish_module(void)
{
}
/* The functions for builtins can be static */
/* Execute the body of this tag in the JavaScript interpreter. */
static void
mp4m_javascript_njs (MP4H_BUILTIN_ARGS)
{
char *script;
javascript_obs = obs;
/* make quotes real quotes before handing the script to the
interpreter... */
script = xstrdup(ARGBODY);
remove_special_chars (script, TRUE);
if ( !js_eval (interp, script) ) {
MP4HERROR ((warning_status, 0,
_("Warning:%s:%d: execution of JavaScript failed:\n%s"),
CURRENT_FILE_LINE, js_error_message (interp)));
}
xfree ((voidstar) script);
}
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