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Merge pull request #7080 from dscravag/nightly2
Nightly 2012-12-19
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| 'use strict'; | ||
|
|
||
| function Parser(input) { this.init(input); } | ||
| Parser.prototype = { | ||
| init: function(input) { | ||
| // No spaces. | ||
| input = input.replace(/[ \t\v\n]/g, ''); | ||
|
|
||
| // String to array: | ||
| this._chars = []; | ||
| for (var i = 0; i < input.length; ++i) | ||
| this._chars.push(input[i]); | ||
|
|
||
| this._tokens = []; | ||
| }, | ||
|
|
||
| // This method returns an array of objects with these properties: | ||
| // - number: true/false | ||
| // - value: the token value | ||
| parse: function() { | ||
|
|
||
| // The input must be a 'block' without any digit left. | ||
| if (!this._tokenizeBlock() || this._chars.length) | ||
| throw ({ type: 'error', msg: 'Wrong input'}); | ||
|
|
||
| return this._tokens; | ||
| }, | ||
|
|
||
| _tokenizeBlock: function() { | ||
| if (!this._chars.length) | ||
| return false; | ||
|
|
||
| // '(' + something + ')' | ||
| if (this._chars[0] == '(') { | ||
| this._tokens.push({number: false, value: this._chars[0]}); | ||
| this._chars.shift(); | ||
|
|
||
| if (!this._tokenizeBlock()) | ||
| return false; | ||
|
|
||
| if (!this._chars.length || this._chars[0] != ')') | ||
| return false; | ||
|
|
||
| this._chars.shift(); | ||
|
|
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| this._tokens.push({number: false, value: ')'}); | ||
| } else { | ||
| // number + ... | ||
| if (!this._tokenizeNumber()) | ||
| return false; | ||
| } | ||
|
|
||
| if (!this._chars.length || this._chars[0] == ')') | ||
| return true; | ||
|
|
||
| while(this._chars.length && this._chars[0] != ')') { | ||
| if (!this._tokenizeOther()) | ||
| return false; | ||
|
|
||
| if (!this._tokenizeBlock()) | ||
| return false; | ||
| } | ||
|
|
||
| return true; | ||
| }, | ||
|
|
||
| // This is a simple float parser. | ||
| _tokenizeNumber: function() { | ||
| if (!this._chars.length) | ||
| return false; | ||
|
|
||
| // {+,-}something | ||
| var number = []; | ||
| if (/[+-]/.test(this._chars[0])) { | ||
| number.push(this._chars.shift()); | ||
| } | ||
|
|
||
| var me = this; | ||
| function tokenizeNumberInternal() { | ||
| if (!me._chars.length || !/^[0-9.]/.test(me._chars[0])) | ||
| return false; | ||
|
|
||
| while (me._chars.length && /[0-9.]/.test(me._chars[0])) { | ||
| number.push(me._chars.shift()); | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| if (!tokenizeNumberInternal()) | ||
| return false; | ||
|
|
||
| // 123{e...} | ||
| if (!this._chars.length || this._chars[0] != 'e') { | ||
| this._tokens.push({number: true, value: number.join('')}); | ||
| return true; | ||
| } | ||
|
|
||
| number.push(this._chars.shift()); | ||
|
|
||
| // 123e{+,-} | ||
| if (/[+-]/.test(this._chars[0])) { | ||
| number.push(this._chars.shift()); | ||
| } | ||
|
|
||
| if (!this._chars.length) | ||
| return false; | ||
|
|
||
| // the number | ||
| if (!tokenizeNumberInternal()) | ||
| return false; | ||
|
|
||
| this._tokens.push({number: true, value: number.join('')}); | ||
| return true; | ||
| }, | ||
|
|
||
| _tokenizeOther: function() { | ||
| if (!this._chars.length) | ||
| return false; | ||
|
|
||
| if (['*', '/', '+', '-'].indexOf(this._chars[0]) != -1) { | ||
| this._tokens.push({number: false, value: this._chars.shift()}); | ||
| return true; | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
| }; |
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