Mercurial > jsparser

comparison parser-demo.js @ 10:8de776b8ed31

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made the demo work on the web instead of the command line.
author Atul Varma <varmaa@toolness.com>
date Sat, 30 May 2009 16:08:25 -0700
parents
children 49145e1db3e5
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9:bc6f30e0f948 10:8de776b8ed31
1 var MyLexicon = [
2 new Parsing.BinaryOrUnaryOp({name: 'plus',
3 match: '+',
4 leftBindingPower: 60}),
5
6 new Parsing.BinaryOrUnaryOp({name: 'minus',
7 match: '-',
8 leftBindingPower: 60}),
9
10 new Parsing.Symbol({name: 'left parenthesis',
11 match: '(',
12 nullDenotation: function(parser) {
13 var contents = parser.expression(0);
14 parser.advance('right parenthesis');
15 return contents;
16 }}),
17
18 new Parsing.Symbol({name: 'right parenthesis',
19 match: ')'}),
20
21 new Parsing.BinaryOp({name: 'multiply',
22 match: '*',
23 leftBindingPower: 70}),
24
25 new Parsing.BinaryOp({name: 'divide',
26 match: '/',
27 leftBindingPower: 70}),
28
29 new Parsing.Symbol({name: 'number',
30 match: /^[0-9]+/,
31 nullDenotation: function() {
32 return this;
33 },
34 toString: function() {
35 return this.value;
36 }}),
37
38 new Parsing.Symbol({name: 'whitespace',
39 match: /^\s+/,
40 ignore: true})
41 ];
42
43 $(window).ready(
44 function() {
45 function print(text) {
46 var node = document.createTextNode(text.toString() + '\n');
47 $('.output').append(node);
48 }
49
50 var code = $('.input').text();
51 var tokens = Parsing.tokenize({lexicon: MyLexicon,
52 text: code});
53
54 function printTokens(tokens) {
55 tokens.forEach(
56 function(token) {
57 var repr = token.name;
58 if (token.value)
59 repr += ":" + token.value;
60 repr += " @L" + token.lineNo + ":" + token.charNo;
61 print(repr);
62 });
63 }
64
65 printTokens(tokens);
66 var parser = new Parsing.Parser(tokens);
67 print(parser.parse());
68 });