/* Copyright (C) 2009 Luke Shumaker
   
   This file is part of rvs.
   
   rvs 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.
   
   rvs 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 rvs; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef FILE_plugin_parse_c_SEEN
#define FILE_plugin_parse_c_SEEN

#include <stdio.h>

/* these 2 are only used in _plugin_parse_escape */
#include <stdlib.h>
#include <error.h>

#include "rvs.h"
#include "plugin.h"

void
_plugin_parse_comment (FILE *file)
{
	char c;
	while ( (c=getc(file)) != EOF ) {
		if ( c == '\n' ) {
			ungetc (c, file);
			break;
		}
	}
}

char
_plugin_parse_escape(FILE *file)
{
	char c=getc(file);
	switch (c) {
		case 'n':
			c = '\n';
		case '\\':
		case '#':
		case ':':
			break;
		default:
			error(EXIT_FAILURE,0,"syntax error");
			break;
	}
	return c;
}

char *
_plugin_parse_depend (FILE *file)
{
	size_t nbytes = 10;
	char *string = (char *)xmalloc(nbytes);
	string[0]='\0';
	
	char c[2] = " \0";
	char *cs = (char *)&c;
	while ( (c[0]=getc(file)) != EOF ) {
		if (c[0] == '\n') {
			ungetc (c[0], file);
			break;
		} else {
			switch (c[0]) {
				case '\\':
					c[0]=_plugin_parse_escape(file);
					stradds(&nbytes,&string,cs);
					break;
				case '#':
					_plugin_parse_comment(file);
					break;
				default:
					stradds(&nbytes,&string,cs);
					break;
			}
		}
	}
	return string;
}

struct plugin_command *
_plugin_parse (FILE *file)
{
	struct plugin_command *command=mkcommand();
	
	size_t nbytes = 10;
	char *string = (char *)xmalloc(nbytes);
	string[0]='\0';
	
	char c[2] = " \0";
	char *cs = (char *)&c;
	
	if ( (c[0]=getc(file)) == EOF )
		return NULL;
	else
		ungetc (c[0], file);
	
	while ( (c[0]=getc(file)) != EOF ) {
		if (c[0] == '\n') {
			if (strlen(string)==0) {
				xfree(command);
				xfree(string);
				command=_plugin_parse(file);
			} else {
				command->name=string;
				command->next=_plugin_parse(file);
			}
			break;
		} else {
			switch (c[0]) {
				case '\\':
					c[0]=_plugin_parse_escape(file);
					stradds(&nbytes,&string,cs);
					break;
				case '#':
					_plugin_parse_comment(file);
					break;
				case ':':
					command->depends=_plugin_parse_depend(
						file);
					break;
				default:
					stradds(&nbytes,&string,cs);
					break;
			}
		}
	}
	return command;
}

#endif