gistfile1.txt
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| class Lexer { | |
| get patterns() { | |
| return { | |
| "whitespace": "\\s+", | |
| "type": "int", | |
| "assign": "=", | |
| "identity": "[a-z]+", | |
| "value": "[0-9]+" | |
| }; | |
| } | |
| analyse(code = "") { | |
| let tokens = []; | |
| while(true) { | |
| let length = code.length; | |
| for (let key in this.patterns) { | |
| let pattern = new RegExp( | |
| "^(" + this.patterns[key] + ")" | |
| ); | |
| let matches = code.match(pattern); | |
| if (matches) { | |
| tokens.push([ | |
| key, matches[1] | |
| ]); | |
| code = code.substring(matches[1].length); | |
| } | |
| } | |
| if (length == code.length) { | |
| break; | |
| } | |
| } | |
| return { | |
| tokens, | |
| code, | |
| }; | |
| } | |
| } | |
| let lexer = new Lexer(); | |
| let result = lexer.analyse("int minutes = 90"); | |
| console.log(result); |
