Easyparse - A parser combinator library for Nim

Easyparse is a parser combinator library written for Nim. It comes with a very flexible parser class which is suitable for parsing a sequence of elements of any type, provided that some primitive parsers are available for that type. Standard parsers for single characters are already included.

Nim generated documentation is available on GitLab Pages. All available combinators are commented with their action and consulting the documentation is warmly suggested.

Quickstart

nimble install https://gitlab.com/trenta3/easyparse

Then in your .nimble file insert:

require "https://gitlab.com/trenta3/easyparse@#master"

Examples

Parsing an integer

Let's see how simple it is to automatically parse a signed integer and convert it to a real integer.

import sugar
import strutils
import easyparse

let sign: Parser[char, seq[char]] = toSeq(ch('-') <|> ch('+') <|> pure('+'))
let concat: (seq[char], seq[char]) -> seq[char] = `&`
let integer: Parser[char, int] = fmap(parseInt,
    liftA2(concat, sign, many1(digit)),
)

echo $integer.parseOrRaise("-82")