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import { pipe } from 'fp-ts/function'
import * as Either from 'fp-ts/Either'
import {
delimited,
digits,
many0,
many1,
manyTill,
mapTo,
matchChar,
matchString,
oneOf,
optional,
or,
pair,
Parser,
ParserResult,
prefixed,
satisfyChar,
sepBy1,
suffixed,
symbol,
tuple3,
whitespaces0,
} from './utils'
import { Expr, index, ListExpr, Literal } from '../types'
import * as Option from 'fp-ts/Option'
import { snd } from 'fp-ts/Tuple'
const start = mapTo(symbol('^'), _ => Expr.Start())
const end = mapTo(symbol('$'), _ => Expr.End())
const anyItem = mapTo(symbol('.'), _ => Expr.AnyItem())
const anyString = mapTo(symbol('\\s'), _ => Expr.AnyString())
const anyNumber = mapTo(symbol('\\n'), _ => Expr.AnyNumber())
const anyBool = mapTo(symbol('\\b'), _ => Expr.AnyBool())
const truthy = mapTo(symbol('\\T'), _ => Expr.Truthy())
const falsey = mapTo(symbol('\\F'), _ => Expr.Falsey())
const parseQuantifier = (s: Option.Option<string>, def: index): index =>
pipe(
s,
Option.map(s => parseInt(s, 10)),
Option.getOrElse(() => def),
)
const wrapQuantifiers: (e: ParserResult<Expr>) => ParserResult<Expr> =
Either.chain(([expr, input]) =>
pipe(
input,
or([
mapTo(symbol('*'), _ => Expr.ZeroOrMore({ expr })),
mapTo(symbol('+'), _ => Expr.OneOrMore({ expr })),
mapTo(symbol('?'), _ => Expr.Optional({ expr })),
mapTo(
pair(
prefixed(symbol('{'), optional(digits)),
delimited(symbol(','), optional(digits), symbol('}')),
),
([min, max]) =>
Expr.MinMax({
expr,
min: parseQuantifier(min, 0),
max: parseQuantifier(max, Infinity),
}),
),
]),
Either.orElse(_ => Either.right([expr, input])),
),
)
const propRegex = /^[A-Za-z0-9_-]$/
export const propertyName: Parser<string> = pipe(
satisfyChar(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,
Option.map(snd),
Option.getOrElse(() => '0'),
n => parseFloat(`${int}.${n}`),
),
)
const numberLiteral: Parser<Literal> = mapTo(
pair(optional(matchChar('-')), unsignedNum),
([signO, n]) =>
pipe(
signO,
negative => (Option.isSome(negative) ? -1 : 1) * n,
Literal.Number,
),
)
const booleanLiteral: Parser<Literal> = mapTo(oneOf(['true', 'false']), b =>
Literal.Boolean(b === 'true' ? true : false),
)
const stringDelimiter = matchChar('"')
const stringLiteral: Parser<Literal> = mapTo(
prefixed(
stringDelimiter,
manyTill(
satisfyChar(_ => true),
stringDelimiter,
),
),
s => Literal.String(s.join('')),
)
const REGEX_FLAGS = ['m', 'g', 'i', 'd', 's', 'u', 'y']
const regexDelimiter = prefixed(optional(matchChar('\\')), matchChar('/'))
const regexLiteral: Parser<Literal> = mapTo(
prefixed(
regexDelimiter,
pair(
manyTill(satisfyChar(_ => true), regexDelimiter),
many0(satisfyChar(c => REGEX_FLAGS.includes(c)))
),
),
([rs, flags]) => Literal.RegExp(new RegExp(rs.join(''), flags.join(''))),
)
const literalP: Parser<Literal> = delimited(
whitespaces0,
or([booleanLiteral, numberLiteral, stringLiteral, regexLiteral]),
whitespaces0,
)
const infixOp =
(op: Parser<any>): Parser<Expr[]> =>
(input: string) =>
pipe(
input,
sepBy1(op, groupP),
Either.chain(([exprs, nextInput]) =>
exprs.length === 1
? Either.left(['Infix operator parsing error', input])
: Either.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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