Node parser combinator


Immutable monadic parser combinator for node javascript.

Example

``javascript
const parsec = require('happy-parser');

const sum = (x, y) => x + y,
rest = (x, y) => x - y

const
termOperations = parsec.Parser.operations([ parsec.char('+'), sum ], [ parsec.char('-'), rest ]).trim(),
factorOperations = parsec.Parser.operations([ parsec.char('^'), Math.pow.bind() ]).trim()

const factor = parsec.lazy(() =>
parsec.int.or(expr.between(parsec.char('('), parsec.char(')'))).trim()
),
term = parsec.lazy(() => factor.chainRight(factorOperations)),
expr = term.chain(termOperations).trim()

console.log(expr.parse(' 3^2 + (4 - 7) '))
``

Check also the documentation and tests