var module = {exports: {}};
var console = {log: function(text){}};
var PEG;

var file = null;
var argtype = 'normal';
var includes = ['.'];
var basedir = '';
var debugmode = false;
var backend = 'C';
var macroonly = false;
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;
		case '-m':
			macroonly = 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 + 'mquery.js');
	load(basedir + 'peg.js');
	PEG = module.exports;
	load(basedir + 'parser.js');
	load(basedir + 'compiler.js');
  load(basedir + 'interp.js');
	if (backend == 'C') {
		load(basedir + 'cbackend.js');
	} else if (backend == 'IL') {
		load(basedir + 'ilbackend.js');
	} else {
		load(basedir + 'jsbackend.js');
	}

	var parsed = parseFile(filename);
	if (debugmode) {
		debugprint = print;
	}
	var top = new topenv(includes);
  parsed = parsed.macroexpand(top);
	if (macroonly) {
		print(''+parsed);
	} else {
		toplevel = new topsymbols(includes, top);
		switch(backend)
		{
		case 'C':
			var c = parsed.toCModule();
			break;
		case 'IL':
			var c = parsed.toILModule();
		case 'JS':
			var c = makeJSProg(parsed);
			break;
		default:
			print('Backend', backend, ' not recognized');
			quit(1);
		}
		print(c);
	}
}