var module = {exports: {}};
var PEG;

var file = null;
var argtype = 'normal';
var includes = ['.'];
var basedir = '';
var debugmode = false;
var backend = 'C';
for (var i = 0; i < arguments.length; i++) {
	switch (argtype) {
	case 'normal':
		switch (arguments[i]) {
		case '-basedir':
		case '-i':
		case '-backend':
			argtype = arguments[i];
			break;
		case '-compilerdebug':
			debugmode = true;
			break;
		default:
			if (arguments[i].charAt(0) == '-') {
				print("unrecognized switch", arguments[i]);
				quit(1);
			}
			file = arguments[i];
		}
		break;
	case '-basedir':
		if (basedir == '') {
			basedir = arguments[i];
			argtype = 'normal';
		} else {
			print("only one -basedir option allowed");
			quit(1);
		}
		break;
	case '-i':
		includes.push(arguments[i]);
		argtype = 'normal';
		break;
	case '-backend':
		backend = arguments[i];
		argtype = 'normal';
		break;
	}
}
if (argtype != 'normal') {
	print("switch", argtype, "expects a parameter");
	quit(1);
}

if (!file) {
	print('usage: d8 tpc.js -- filename');
	quit(1);
}
includes.push(basedir + 'modules');
compileFile(file, basedir, includes, debugmode, backend);


function parseFile(filename)
{
	debugprint('//parsing', filename);
	var text = read(filename);
	try {
		var parsed = parser.parse(text);	
	} catch (error) {
		print('SyntaxError on at', error.line, ',', error.column, ':', error.message);
		var lines = text.split('\n');
		print(lines[error.line-1]);
		var spacer = '';
		for (var i = 1; i < error.column; i++) {
			if (lines[error.line-1].charAt(i-1) == '\t') {
				spacer += '    ';
			} else {
				spacer += ' ';
			}
		}
		print(spacer + '^');
		quit(1);
	}
	return parsed;
}


function compileFile(filename, basedir, includes, debugmode, backend)
{
	
	load(basedir + 'peg.js');
	PEG = module.exports;
	load(basedir + 'parser.js');
	load(basedir + 'compiler.js');
	if (backend == 'C') {
		load(basedir + 'cbackend.js');
	} else {
		load(basedir + 'jsbackend.js');
	}
	
	var parsed = parseFile(filename);
	if (debugmode) {
		debugprint = print;
	}
	toplevel = new topsymbols(includes);
	switch(backend)
	{
	case 'C':
		var c = parsed.toCModule();
		break;
	case 'JS':
		var c = makeJSProg(parsed);
		break;
	default:
		print('Backend', backend, ' not recognized');
		quit(1);
	}
	print(c);
}