/* GNU gettext - internationalization aids
   Copyright (C) 1995, 1996 Free Software Foundation, Inc.

   This file was written by Peter Miller <pmiller@agso.gov.au>

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 <ctype.h>
#include <stdio.h>

#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif

#include "po.h"
#include "po-hash.h"
#include "system.h"

/* Prototypes for local functions.  */
static void po_parse_brief PARAMS ((po_ty *__pop));
static void po_parse_debrief PARAMS ((po_ty *__pop));

/* Methods used indirectly by po_scan.  */
static void po_directive_domain PARAMS ((po_ty *__pop, char *__name));
static void po_directive_message PARAMS ((po_ty *__pop, char *__msgid,
					  lex_pos_ty *__msgid_pos,
					  char *__msgstr,
					  lex_pos_ty *__msgstr_pos));
static void po_comment PARAMS ((po_ty *__pop, const char *__s));
static void po_comment_dot PARAMS ((po_ty *__pop, const char *__s));
static void po_comment_filepos PARAMS ((po_ty *__pop, const char *__name,
					int __line));
static void po_comment_special PARAMS ((po_ty *pop, const char *s));

/* Local variables.  */
static po_ty *callback_arg;


po_ty *
po_alloc (pomp)
     po_method_ty *pomp;
{
  po_ty *pop;

  pop = xmalloc (pomp->size);
  pop->method = pomp;
  if (pomp->constructor)
    pomp->constructor (pop);
  return pop;
}


void
po_free (pop)
     po_ty *pop;
{
  if (pop->method->destructor)
    pop->method->destructor (pop);
  free (pop);
}


void
po_scan (pop, filename)
     po_ty *pop;
     const char *filename;
{
  extern int po_gram_parse PARAMS ((void));

  /* The parse will call the po_callback_... functions (see below)
     when the various directive are recognised.  The callback_arg
     variable is used to tell these functions which instance is to
     have the relevant method invoked.  */
  callback_arg = pop;

  /* Open the file and parse it.  */
  lex_open (filename);
  po_parse_brief (pop);
  po_gram_parse ();
  po_parse_debrief (pop);
  lex_close ();
  callback_arg = 0;
}


static void
po_parse_brief (pop)
     po_ty *pop;
{
  if (pop->method->parse_brief)
    pop->method->parse_brief (pop);
}


static void
po_parse_debrief (pop)
     po_ty *pop;
{
  if (pop->method->parse_debrief)
    pop->method->parse_debrief (pop);
}


static void
po_directive_domain (pop, name)
     po_ty *pop;
     char *name;
{
  if (pop->method->directive_domain)
    pop->method->directive_domain (pop, name);
}


void
po_callback_domain (name)
     char *name;
{
  /* assert(callback_arg); */
  po_directive_domain (callback_arg, name);
}


static void
po_directive_message (pop, msgid, msgid_pos, msgstr, msgstr_pos)
     po_ty *pop;
     char *msgid;
     lex_pos_ty *msgid_pos;
     char *msgstr;
     lex_pos_ty *msgstr_pos;
{
  if (pop->method->directive_message)
    pop->method->directive_message (pop, msgid, msgid_pos, msgstr, msgstr_pos);
}


void
po_callback_message (msgid, msgid_pos, msgstr, msgstr_pos)
     char *msgid;
     lex_pos_ty *msgid_pos;
     char *msgstr;
     lex_pos_ty *msgstr_pos;
{
  /* assert(callback_arg); */
  po_directive_message (callback_arg, msgid, msgid_pos, msgstr, msgstr_pos);
}


static void
po_comment_special (pop, s)
     po_ty *pop;
     const char *s;
{
  if (pop->method->comment_special != NULL)
    pop->method->comment_special (pop, s);
}


static void
po_comment (pop, s)
     po_ty *pop;
     const char *s;
{
  if (pop->method->comment != NULL)
    pop->method->comment (pop, s);
}


static void
po_comment_dot (pop, s)
     po_ty *pop;
     const char *s;
{
  if (pop->method->comment_dot != NULL)
    pop->method->comment_dot (pop, s);
}


/* This function is called by po_gram_lex() whenever a comment is
   seen.  It analyzes the comment to see what sort it is, and then
   dispatces it to the appropriate method.  */
void
po_callback_comment (s)
     const char *s;
{
  /* assert(callback_arg); */
  if (*s == '.')
    po_comment_dot (callback_arg, s + 1);
  else if (*s == ':')
    {
      /* Parse the file location string.  If the parse succeeds, the
	 appropriate callback will be invoked.  If the parse fails,
	 the po_hash_parse function will return non-zero - so pretend
	 it was a normal comment.  */
      if (po_hash (s + 1) == 0)
	/* Do nothing, it is a GNU-style file pos line.  */ ;
      else
	po_comment (callback_arg, s + 1);
    }
  else if (*s == ',' || *s == '!')
    /* Get all entries in the special comment line.  */
    po_comment_special (callback_arg, s + 1);
  else
    {
      /* It looks like a plain vanilla comment, but Solaris-style file
	 position lines do, too.  Rather than parse the lot, only look
	 at lines that could start with "# File..." This minimizes
	 memory leaks on failed parses.  If the parse succeeds, the
	 appropriate callback will be invoked.  */
      if (s[0] == ' ' && (s[1] == 'F' || s[1] == 'f') && s[2] == 'i'
	  && po_hash (s) == 0)
	/* Do nothing, it is a Sun-style file pos line.  */ ;
      else
	po_comment (callback_arg, s);
    }
}


static void
po_comment_filepos (pop, name, line)
     po_ty *pop;
     const char *name;
     int line;
{
  if (pop->method->comment_filepos)
    pop->method->comment_filepos (pop, name, line);
}


void
po_callback_comment_filepos (name, line)
     const char *name;
     int line;
{
  /* assert(callback_arg); */
  po_comment_filepos (callback_arg, name, line);
}
