main.js

'use strict';

var fs = require('fs'),
    path = require('path'),
    argv = require('minimist')(process.argv.slice(2)),
    Scanner = require('./scanner.js'),
    Syntax = require('./syntax.js'),
    SymbolTable = require('./symbol-table.js'),
    filename = (argv._[0]) ? path.join(process.cwd(), argv._[0]) : null,
    _callbacks = [];

if (!filename || argv.h || argv.help) {
  var helpText = path.join(__dirname, 'help.txt');
  console.log(fs.readFileSync(helpText).toString());
  return;
}

GLOBAL.DEBUG = !!(argv.d || argv.debug);

/* jshint latedef: false */
function _then(cb) {
  if (!cb) {
    return {
      then: _then
    };
  }

  if (typeof cb === 'string') {
    _callbacks.push(runPass.bind(null, cb));
  } else {
    _callbacks.push(cb);
  }
  return {
    then: _then
  };
}

function runPass(passName) {
  Scanner.init(filename, function() {
    try {
      SymbolTable().startPass();
      Syntax.pass(passName);
    } catch(e) {
      var token = Scanner.currentToken;
      e.message = 'Pass: ' + passName + '\nLine ' + token.lineNumber + ': ' + e.message;
      if (GLOBAL.DEBUG) {
        throw e;
      } else {
        console.log(e.message);
        process.exit(1);
      }
    }

    if (_callbacks.length > 0) {
      _callbacks.shift()();
    }
  });

  return {
    then: _then
  };
}
/* jshint latedef: true */

runPass('syntax')
.then('type inference')
.then('semantics')
.then(function() {
  var target = argv.t || argv.target || 'uvu',
      ICode = require('./icode.js'),
      TCode = require('./target/' + target + '.js'),
      outputICode = argv.i || argv.icode,
      outputTCode = argv.o || argv.output,
      icode = '',
      targetCode;

  if (outputICode) {
    icode = ICode.createCode();

    if (typeof outputICode === 'string') {
      fs.writeFileSync(path.join(process.cwd(), outputICode), icode);
    } else {
      console.log(icode);
    }
  }

  if (outputTCode) {
    targetCode = TCode.compile(ICode.quads);
    if (typeof outputTCode === 'string') {
      fs.writeFileSync(path.join(process.cwd(), outputTCode), targetCode);
    } else {
      console.log(targetCode);
    }
  }

  if (argv.s || argv.symbol) {
    SymbolTable().print();
  }
});