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import { pipe } from 'fp-ts/function'
import { chain, orElse, right } from 'fp-ts/lib/Either'
import {
delimited,
many1,
mapTo,
optional,
or,
Parser,
ParserResult,
symbol,
tuple3,
} from './utils'
import { Expr } from '../types'
export const start = mapTo(symbol('^'), () => Expr.Start(null))
export const end = mapTo(symbol('$'), () => Expr.End(null))
export const anyItem = mapTo(symbol('.'), () => Expr.AnyItem(null))
export const nextItem = mapTo(symbol(','), () => Expr.NextItem(null))
export const anyString = mapTo(symbol('\\s'), () => Expr.AnyString(null))
export const anyNumber = mapTo(symbol('\\n'), () => Expr.AnyNumber(null))
export const anyBool = mapTo(symbol('\\b'), () => Expr.AnyBool(null))
export const truthy = mapTo(symbol('\\T'), () => Expr.Truthy(null))
export const falsey = mapTo(symbol('\\F'), () => Expr.Falsey(null))
export const wrapQuantifiers: (e: ParserResult<Expr>) => ParserResult<Expr> =
chain(([expr, input]) =>
pipe(
input,
or([
mapTo(symbol('*'), () => Expr.ZeroOrMore({ expr })),
mapTo(symbol('+'), () => Expr.OneOrMore({ expr })),
mapTo(symbol('?'), () => Expr.Optional({ expr })),
]),
orElse(() => right([expr, input]))
)
)
export const expressionP: Parser<Expr> = (input: string) =>
pipe(
input,
or([
mapTo(delimited(symbol('('), many1(expressionP), symbol(')')), (exprs) =>
Expr.Group({ exprs })
),
nextItem,
anyItem,
anyString,
anyNumber,
anyBool,
truthy,
falsey,
]),
wrapQuantifiers
)
export const parser = tuple3(optional(start), many1(expressionP), optional(end))
/*
{3,6} => 3 to 6 instances
(> 5) => number greater than
(< 5) => number less than
[name x] => apply x on property `name`
| => or
/x/ => match regular expression (string values in list)
*/
|
