In this project you can learn how you can create your own computer language.
npm ci
npm start
- node^18.0.0
Code execution consists of several steps: Lexical analysis (Lexer), Syntactic analysis (or parsing), Execution
Lexer takes raw text and outputs array of tokens. Token examples:
| token name | token values | decription |
|---|---|---|
| identifier | x, color, UP |
names the programmer chooses |
| keyword | if, while, return |
names already in the programming language |
| separator | }, (, ; |
punctuation characters and paired-delimiters |
| operator | +, <, = |
symbols that operate on arguments and produce results |
| literal | true, 6.02e23, "music" |
numeric, logical, textual, reference literals |
| comment | // some comment |
comments |
Execution example:
Lexer('x = 5') => [{ type: identifier, value: 'x' }, { type: operator, value: '=' }, { type: literal, value: 5 }]
During Syntactic analysis parser validates that the tokens form an allowable expression, e.g. after ( exists ).