/* parser.c: -*- C -*-  Modify parser parameters. */

/*  Copyright (c) 1996 Brian J. Fox
    Author: Brian J. Fox (bfox@ai.mit.edu) Fri May  2 13:03:37 1997.

    This file is part of <Meta-HTML>(tm), a system for the rapid
    deployment of Internet and Intranet applications via the use of
    the Meta-HTML language.

    Copyright (c) 1995, 1996, Brian J. Fox (bfox@ai.mit.edu).
    Copyright (c) 1996, Universal Access Inc. (http://www.ua.com).

    Meta-HTML is free software; you can redistribute it and/or modify
    it under the terms of the UAI Free Software License as published
    by Universal Access Inc.; either version 1, or (at your option) any
    later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    UAI Free Software License for more details.

    You should have received a copy of the UAI Free Software License
    along with this program; if you have not, you may obtain one by
    writing to:

    Universal Access Inc.
    129 El Paseo Court
    Santa Barbara, CA
    93101  */

#include "language.h"

/* 0) #include any files that are specific to your module. */

/* 1) Declare the functions which implement the Meta-HTML functionality. */
static void pf_change_brackets (PFunArgs);

/* 2) Create a static table which associates function name, type, debug-flags,
      and address of code for each function. */
static PFunDesc functab[] = {
  /*   tag	     complex? debug_level	   code    */
  { "PARSER::CHANGE-BRACKETS", 	0,	 0,	pf_change_brackets },
  { (char *)NULL,	0,	 0,		(PFunHandler *)NULL }
};

/* 3) Write the function which installs the commands, and performs any other
      module specific initializations.  This function is called exactly once.*/
void
module_initialize (void)
{
  register int i;
  Symbol *sym;

  /* Install the names and pointers. */
  for (i = 0; functab[i].tag != (char *)NULL; i++)
    {
      sym = symbol_intern_in_package (mhtml_function_package, functab[i].tag);
      sym->type = symtype_FUNCTION;
      sym->values = (char **)(&functab[i]);
    }
}

void _init (void) { module_initialize (); }

/* 4) Write the actual code which implements your functionality. */

/* <parser::change-brackets "{}"> --> Allow new opener and closer. */
static void
pf_change_brackets (PFunArgs)
{
  char *brackets = mhtml_evaluate_string (get_positional_arg (vars, 0));

  if (!empty_string_p (brackets) && (brackets[0]) && (brackets[1]))
    {
      LEFT_BRACKET = brackets[0];
      RIGHT_BRACKET = brackets[1];
    }
  xfree (brackets);
}
