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maciejsmolinski/toy-lang
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An adventure with hand crafted parsing in an attempt to create a tiny, Turing incomplete toy language.
Function definitions and function calls
funaverage(a, b){return(a + b) /2}average(3.14,2)
and that's it for now!
Open and run the project via gitpod.io:
https://gitpod.io/#https://github.com/maciejsmolinski/toy-lang/blob/main/index.ts
Clone the repository, check out the directory and install dependencies
git clone git@github.com:maciejsmolinski/toy-lang.gitcd toy-lang&& npm install
Run the code and watch for file changes
npm run watch
The output printed on the screen
[INPUT] fun average(a, b) {return (a + b) / 2 } average(3.14, 2)[TOKENIZE:OUTPUT]{ type:'identifier', value:'fun' }{ type:'identifier', value:'average' }{ type:'leftParen' }{ type:'identifier', value:'a' }{ type:'comma' }{ type:'identifier', value:'b' }{ type:'rightParen' }{ type:'leftBrace' }{ type:'return' }{ type:'leftParen' }{ type:'identifier', value:'a' }{ type:'operator', value:'+' }{ type:'identifier', value:'b' }{ type:'rightParen' }{ type:'operator', value:'/' }{ type:'number', value: 2 }{ type:'rightBrace' }{ type:'identifier', value:'average' }{ type:'leftParen' }{ type:'number', value: 3.14 }{ type:'comma' }{ type:'number', value: 2 }{ type:'rightParen' }[PARSE:OUTPUT]{"type":"Program","body": [ {"type":"FunctionDeclaration","name": {"type":"Identifier","name":"average" },"params": [ {"type":"Identifier","name":"a" }, {"type":"Identifier","name":"b" } ],"body": {"type":"BlockStatement","body": [ {"type":"ReturnStatement","expr": {"type":"BinaryExpression","left": {"type":"BinaryExpression","left": {"type":"Identifier","name":"a" },"operator":"+","right": {"type":"Identifier","name":"b" } },"operator":"/","right": {"type":"NumericLiteral","value": 2 } } } ] } }, {"type":"FunctionCall","name": {"type":"Identifier","name":"average" },"args": [ {"type":"NumericLiteral","value": 3.14 }, {"type":"NumericLiteral","value": 2 } ] } ]}