Mercurial > jsparser

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