/* Oort
 * Copyright 2007, Soren Sandmann Pedersen
 *
 * 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 of the License, 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "ast.h"

ast_t *
compile (const char *input, gboolean do_optimize, gboolean debug_spew)
{
    token_t *tokens;
    ast_t *ast;

    if (!(tokens = scan (input)))
	return NULL;

    if (!(ast = parse (tokens)))
	return NULL;

    if (debug_spew)
	dump_program (&ast->program);

    if (!prepare (ast))
	return NULL;

    if (!symbol (ast))
	return NULL;

    if (!type_check (ast))
	return NULL;

    if (!mark_constants (ast))
	return NULL;

    if (!switch_check (ast))
	return NULL;

    if (!graph (ast))
	return NULL;
    
    if (debug_spew)
	dump_graph (&ast->program);

    if (!init_check (ast))
	return NULL;

    if (!return_check (ast))
	return NULL;

    if (!levels (ast))
	return NULL;

    if (do_optimize)
    {
	if (!optimize (ast))
	    return NULL;

	if (debug_spew)
	{
	    g_print ("-=-=-=-=- Graph after optimization -=-=-=-=-=- \n");
	    dump_graph (&ast->program);
	}
    }

    if (!offsets (ast))
	return NULL;

    return ast;
}

static void
usage (const char *arg0)
{
    g_print ("Usage: %s [-O] [-d] filename\n", arg0);
    g_print ("\n");
    g_print ("-O: Optimize\n");
    g_print ("-d: Print debug spew\n");
    exit (1);
}

int
main (int argc, char **argv)
{
    gboolean optimize = FALSE;
    gboolean debug_spew = FALSE;
    gboolean run_tests = FALSE;
    const char *filename = NULL;
    char *contents;
    size_t size;
    int i;
    
    for (i = 1; i < argc; ++i)
    {
	char *arg = argv[i];

	if (strcmp (arg, "-O") == 0)
	{
	    optimize = TRUE;
	}
	else if (strcmp (arg, "-t") == 0)
	{
	    run_tests = TRUE;
	}
	else if (strcmp (arg, "-d") == 0)
	{
	    debug_spew = TRUE;
	}
	else if (!filename)
	{
	    filename = arg;
	}
	else
	{
	    usage (argv[0]);
	}
    }

    if (run_tests)
	run_internal_tests ();
    else if (!filename)
	usage (argv[0]);

    if (!g_file_get_contents (filename, &contents, &size, NULL))
    {
	g_print ("Could not read %s\n", filename);
	return 0;
    }
    else
    {
	ast_t *ast;

	if ((ast = compile (contents, optimize, debug_spew)))
	{
	    interpret (ast);
	}
    }

    return 0;
}