/* YCP and Smalltalk format strings.
   Copyright (C) 2001 Free Software Foundation, Inc.
   Written by Bruno Haible <haible@clisp.cons.org>, 2001.

   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.

   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
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdbool.h>
#include <stdlib.h>

#include "format.h"
#include "xmalloc.h"
#include "error.h"
#include "progname.h"
#include "gettext.h"

#define _(str) gettext (str)

/* YCP sformat strings are described in libycp documentation YCP-builtins.html.
   A directive starts with '%' and is followed by '%' or a nonzero digit ('1'
   to '9').
   GNU Smalltalk format strings are described in the CharArray documentation,
   methods 'bindWith:' and 'bindWithArguments:'. They have the same syntax.
 */

struct spec
{
  unsigned int directives;
  unsigned int arg_count;
  bool args_used[9];
};


/* Prototypes for local functions.  Needed to ensure compiler checking of
   function argument counts despite of K&R C function definition syntax.  */
static void *format_parse PARAMS ((const char *format));
static void format_free PARAMS ((void *descr));
static int format_get_number_of_directives PARAMS ((void *descr));
static bool format_check PARAMS ((const lex_pos_ty *pos,
				  void *msgid_descr, void *msgstr_descr,
				  bool equality,
				  bool noisy, const char *pretty_msgstr));


static void *
format_parse (format)
     const char *format;
{
  struct spec spec;
  struct spec *result;

  spec.directives = 0;
  spec.arg_count = 0;

  for (; *format != '\0';)
    if (*format++ == '%')
      {
	/* A directive.  */
	spec.directives++;

	if (*format == '%')
	  format++;
	else if (*format >= '1' && *format <= '9')
	  {
	    unsigned int number = *format - '1';

	    while (spec.arg_count <= number)
	      spec.args_used[spec.arg_count++] = false;
	    spec.args_used[number] = true;

	    format++;
	  }
	else
	  goto bad_format;
      }

  result = (struct spec *) xmalloc (sizeof (struct spec));
  *result = spec;
  return result;

 bad_format:
  return NULL;
}

static void
format_free (descr)
     void *descr;
{
  struct spec *spec = (struct spec *) descr;

  free (spec);
}

static int
format_get_number_of_directives (descr)
     void *descr;
{
  struct spec *spec = (struct spec *) descr;

  return spec->directives;
}

static bool
format_check (pos, msgid_descr, msgstr_descr, equality, noisy, pretty_msgstr)
     const lex_pos_ty *pos;
     void *msgid_descr;
     void *msgstr_descr;
     bool equality;
     bool noisy;
     const char *pretty_msgstr;
{
  struct spec *spec1 = (struct spec *) msgid_descr;
  struct spec *spec2 = (struct spec *) msgstr_descr;
  bool err = false;
  unsigned int i;

  for (i = 0; i < spec1->arg_count || i < spec2->arg_count; i++)
    {
      bool arg_used1 = (i < spec1->arg_count && spec1->args_used[i]);
      bool arg_used2 = (i < spec2->arg_count && spec2->args_used[i]);

      if (equality ? (arg_used1 != arg_used2) : (!arg_used1 && arg_used2))
	{
	  if (noisy)
	    {
	      error_with_progname = false;
	      error_at_line (0, 0, pos->file_name, pos->line_number,
			     arg_used1
			     ? _("a format specification for argument %u doesn't exist in '%s'")
			     : _("a format specification for argument %u, as in '%s', doesn't exist in 'msgid'"),
			     i + 1, pretty_msgstr);
	      error_with_progname = true;
	    }
	  err = true;
	  break;
	}
    }

  return err;
}


struct formatstring_parser formatstring_ycp =
{
  format_parse,
  format_free,
  format_get_number_of_directives,
  format_check
};


struct formatstring_parser formatstring_smalltalk =
{
  format_parse,
  format_free,
  format_get_number_of_directives,
  format_check
};


#ifdef TEST

/* Test program: Print the argument list specification returned by
   format_parse for strings read from standard input.  */

#include <stdio.h>
#include "getline.h"

static void
format_print (descr)
     void *descr;
{
  struct spec *spec = (struct spec *) descr;
  unsigned int i;

  if (spec == NULL)
    {
      printf ("INVALID");
      return;
    }

  printf ("(");
  for (i = 0; i < spec->arg_count; i++)
    {
      if (i > 0)
	printf (" ");
      if (spec->args_used[i])
	printf ("*");
      else
	printf ("_");
    }
  printf (")");
}

int
main ()
{
  for (;;)
    {
      char *line = NULL;
      size_t line_len = 0;
      void *descr;

      if (getline (&line, &line_len, stdin) < 0)
	break;

      descr = format_parse (line);

      format_print (descr);
      printf ("\n");

      free (line);
    }

  return 0;
}

/*
 * For Emacs M-x compile
 * Local Variables:
 * compile-command: "/bin/sh ../libtool --mode=link gcc -o a.out -static -O -g -Wall -I.. -I../lib -I../intl -DHAVE_CONFIG_H -DTEST format-ycp.c ../lib/libgettextlib.la"
 * End:
 */

#endif /* TEST */