README.md

AST parser

Javascript AST parser for 'simple' expressions.

Install

npm install -g karma-cli
npm install

Run tests

karma start

Usage

var tree = Tokenize('1 + foo');

console.log(tree);

Supported expressions

• Numbers (1, 1.23)
• Strings ('foo')
• BinaryExpression (+-%/*)
• LogicalExpression (|| &&)
• Identifier (foo)
• Objects (foo.bar, foo['bar'])
• Arrays (foo[0])
• Functions (foo(), foo('bar'))
• Nested expressions (a || b && c)
• Literals (true, false, null)
• ConditionalExpressions (foo ? true : false)
• Unary Expression (!foo, --bar)
• Assignment Expression (foo = 'bar')

Roadmap

• Performance
• More operators
• Compile AST to callable
• Throw error when string could not be parsed

var tree = Tokenize('1 + foo');
var callable = Compile();  

callable({foo: 2}); // Outputs '3'

• Better and more usefull errors

Add support for

• foo++
• foo--
• !activeTab || activeTab === 'intern'
• !foo || bar
• foo.bar.baz['a']['b']

Todo tests

foo['a'].bar.baz
// fails, outputs. property should be type: identifier with value: baz
{
	"type": "Object",
	"object": {
		"type": "Object",
		"object": {
			"type": "Identifier",
			"value": "foo"
		},
		"property": {
			"type": "String",
			"value": "a"
		}
	},
	"property": {
		"type": "Object",
		"object": {
			"type": "Identifier",
			"value": "bar"
		},
		"property": {
			"type": "Identifier",
			"value": "baz"
		}
	}
}

Add parser errors