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import { flow, pipe } from 'fp-ts/function'
import { chain, map as mapE, left, orElse, right } from 'fp-ts/lib/Either'
import {
delimited,
digits,
many0,
many1,
mapTo,
matchChar,
oneOf,
optional,
or,
pair,
Parser,
ParserResult,
prefixed,
satifyChar,
sepBy1,
suffixed,
symbol,
tuple3,
whitespaces0,
} from './utils'
import { Expr, ListExpr, Literal } from '../types'
import {getOrElse, map} from 'fp-ts/lib/Option'
import {mapFst, snd} from 'fp-ts/lib/Tuple'
const start = mapTo(symbol('^'), _ => Expr.Start())
const end = mapTo(symbol('$'), _ => Expr.End())
const anyItem = mapTo(symbol('.'), _ => Expr.AnyItem())
const anyString = mapTo(symbol('\\s'), _ => Expr.AnyString())
const anyNumber = mapTo(symbol('\\n'), _ => Expr.AnyNumber())
const anyBool = mapTo(symbol('\\b'), _ => Expr.AnyBool())
const truthy = mapTo(symbol('\\T'), _ => Expr.Truthy())
const falsey = mapTo(symbol('\\F'), _ => Expr.Falsey())
const wrapQuantifiers: (e: ParserResult<Expr>) => ParserResult<Expr> = chain(
([expr, input]) =>
pipe(
input,
or([
mapTo(symbol('*'), _ => Expr.ZeroOrMore({ expr })),
mapTo(symbol('+'), _ => Expr.OneOrMore({ expr })),
mapTo(symbol('?'), _ => Expr.Optional({ expr })),
]),
orElse(_ => right([expr, input])),
),
)
const propRegex = /^[A-Za-z0-9_-]$/
export const propertyName: Parser<string> = pipe(
satifyChar(c => propRegex.test(c)),
many1,
p => mapTo(p, xs => xs.join('')),
p => suffixed(p, whitespaces0),
)
const objectProperty = (input: string) =>
pipe(
input,
mapTo(
delimited(
symbol('['),
pair(propertyName, many0(expressionP)),
symbol(']'),
),
([name, exprs]) => Expr.PropertyMatch({ name, expr: exprsToGroup(exprs) }),
),
)
const unsignedNum: Parser<number> = mapTo(pair(digits, optional(pair(matchChar('.'), digits))), ([int, decimal]) =>
pipe(
decimal,
map(snd),
getOrElse(() => '0'),
n => parseFloat(`${int}.${n}`),
)
)
const numberLiteral: Parser<Literal> = mapTo(
pair(optional(oneOf(['+', '-'])), unsignedNum),
([signO, n]) =>
pipe(
signO,
getOrElse(() => '+'),
sign => (sign === '-' ? -1 : 1) * n,
Literal.Number,
)
,
)
const booleanLiteral: Parser<Literal> = mapTo(oneOf(['true', 'false']), b =>
Literal.Boolean(b === 'true' ? true : false),
)
const literalP: Parser<Literal> = delimited(
whitespaces0,
or([booleanLiteral, numberLiteral]),
whitespaces0,
)
const infixOp = (op: Parser<any>): Parser<Expr[]> => (input: string) => pipe(
input,
sepBy1(op, groupP),
chain(([exprs, nextInput]) => exprs.length === 1
? left(['Infix operator parsing error', input])
: right([exprs, nextInput])),
)
const altP: Parser<Expr> = mapTo(infixOp(symbol('|')), exprs => Expr.Or({ exprs }))
const sequenceP: Parser<Expr> = mapTo(infixOp(symbol(',')), exprs => Expr.Sequence({ exprs }))
const expressionP: Parser<Expr> = (input: string) => or([ altP, sequenceP, groupP ])(input)
const atomP: Parser<Expr> = (input: string) =>
pipe(
input,
or([
mapTo(delimited(symbol('('), many1(expressionP), symbol(')')), exprsToGroup),
objectProperty,
anyItem,
anyString,
anyNumber,
anyBool,
truthy,
falsey,
mapTo(literalP, Expr.Literal),
]),
wrapQuantifiers,
)
const exprsToGroup = (exprs: Expr[]) => exprs.length === 1 ? exprs[0] : Expr.Group({ exprs })
const groupP: Parser<Expr> = mapTo(many1(atomP), exprsToGroup)
export const parser: Parser<ListExpr> = tuple3(
optional(start),
expressionP,
optional(end),
)
/*
{3,6} => 3 to 6 instances
(> 5) => number greater than
(< 5) => number less than
/x/ => match regular expression (string values in list)
*/
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