var MyLexicon = [
  new Parsing.BinaryOrUnaryOp({name: 'plus',
                               match: '+',
                               leftBindingPower: 60}),

  new Parsing.BinaryOrUnaryOp({name: 'minus',
                               match: '-',
                               leftBindingPower: 60}),

  new Parsing.Symbol({name: 'left parenthesis',
                      match: '(',
                      nullDenotation: function(parser) {
                        var contents = parser.expression(0);
                        parser.advance('right parenthesis');
                        return contents;
                      }}),

  new Parsing.Symbol({name: 'right parenthesis',
                      match: ')'}),

  new Parsing.BinaryOp({name: 'multiply',
                        match: '*',
                        leftBindingPower: 70}),

  new Parsing.BinaryOp({name: 'divide',
                        match: '/',
                        leftBindingPower: 70}),

  new Parsing.Symbol({name: 'number',
                      match: /^[0-9]+/,
                      nullDenotation: function() {
                        return this;
                      },
                      toString: function() {
                        return this.value;
                      }}),

  new Parsing.Symbol({name: 'whitespace',
                      match: /^\s+/,
                      ignore: true})
];

$(window).ready(
  function() {
    function print(text) {
      var node = document.createTextNode(text.toString() + '\n');
      $('.output').append(node);
    }

    var code = $('.input').text();
    var tokens = Parsing.tokenize({lexicon: MyLexicon,
                                   text: code});

    function printTokens(tokens) {
      tokens.forEach(
        function(token) {
          var repr = token.name;
          if (token.value)
            repr += ":" + token.value;
          repr += " @L" + token.lineNo + ":" + token.charNo;
          print(repr);
        });
    }

    printTokens(tokens);
    var parser = new Parsing.Parser(tokens);
    print(parser.parse());
  });