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import { identity, pipe } from 'fp-ts/function'
import { filter, takeLeftWhile, zip, zipWith } from 'fp-ts/lib/Array'
import {
chain,
getOrElseW,
isSome,
map,
none,
Option,
some,
} from 'fp-ts/lib/Option'
import { Expr, ListExpr, Literal } from '../types'
import { jlog, match } from '../utils'
export interface MatchGroupIndexed<T = any> {
value: T
index: number
}
export interface MatchGroupResult {
groups: MatchGroupIndexed[]
}
const group = <T>(value: T, index: number): MatchGroupIndexed<T> => ({
value,
index,
})
type index = number
const accumulateSkip = () => {
const skipIndexes = [] as index[]
return {
localSkip:
(i: index) =>
<T>(x: T): T => (skipIndexes.push(i), x),
getSkips: () => skipIndexes,
}
}
const checkExpr = <T>(
expr: Expr,
item: T,
list: T[],
index: number,
skip: (
n: index,
) => (m: MatchGroupIndexed<any>[]) => MatchGroupIndexed<any>[] = _ =>
identity,
): MatchGroupIndexed<any>[] => {
return pipe(
expr,
match<MatchGroupIndexed<any>[], Expr>({
AnyItem: _ => pipe([group(item, index)], skip(1)),
AnyNumber: _ =>
pipe(typeof item === 'number' ? [group(item, index)] : [], skip(1)),
AnyString: _ =>
pipe(typeof item === 'string' ? [group(item, index)] : [], skip(1)),
AnyBool: _ =>
pipe(typeof item === 'boolean' ? [group(item, index)] : [], skip(1)),
Truthy: _ => pipe(!!item ? [group(item, index)] : [], skip(1)),
Falsey: _ => pipe(!item ? [group(item, index)] : [], skip(1)),
Literal: literal =>
pipe(
(literal.value as any) === item ? [group(item, index)] : [],
skip(1),
),
Group: ({ exprs }) => {
const [head, ...tail] = exprs
const { getSkips, localSkip } = accumulateSkip()
const matches = tail.reduce(
(acc, exp) =>
pipe(
acc,
chain(ac =>
pipe(
checkExpr(exp, item, list, index, localSkip),
zip(ac),
z => z.map(([res, _cur]) => res),
z => (z.length === 0 ? none : some(z)),
),
),
),
some(checkExpr(head, item, list, index, localSkip)),
)
return pipe(
matches,
getOrElseW(() => []),
skip(Math.max(...getSkips()) || 1),
)
},
Or: ({ exprs }) => {
const match = exprs.find(
expr => checkExpr(expr, item, list, index).length > 0,
)
return pipe(match ? [group(item, index)] : [], skip(1))
},
PropertyMatch: ({ name, expr }) =>
pipe(
Object.prototype.hasOwnProperty.call(item ?? {}, name)
? checkExpr(expr, item[name], list, index)
: [],
res => (res.length > 0 ? [group(item, index)] : []), // FIXME: doesn't allow nested matching
skip(1),
),
OneOrMore: ({ expr }) => {
// TODO: Nested quantified expression
const matches = pipe(
list,
takeLeftWhile(a => checkExpr(expr, a, list, index).length > 0),
)
return pipe(
matches.length > 0 ? [group(matches, index)] : [],
skip(matches.length || 1),
)
},
Sequence: ({ exprs }) => {
const { getSkips, localSkip } = accumulateSkip()
const getGroups = () => {
if (exprs.length > list.length) return []
const indexed = <T>(ls: T[]): Array<[number, T]> =>
ls.map((x, i) => [i, x])
const result = pipe(
zipWith(exprs, indexed(list), (expr, [i, val]) =>
checkExpr(expr, val, list.slice(i), index + i, localSkip),
),
filter(matches => !!matches.length),
)
if (result.length !== exprs.length) return []
return [group(result, index)]
}
const groups = getGroups()
const skips = Math.max(1, getSkips().reduce((a, b) => a + b, -1))
return pipe(groups, skip(skips))
},
_: _ => {
throw new Error(`TODO: ${expr.tag} not implemented for match`)
},
}),
)
}
export const matchAll = <T>(
[startO, expr, endO]: ListExpr,
list: T[],
): MatchGroupResult => {
const check = (index: number, ls: T[], expr: Expr): MatchGroupIndexed[] => {
if (ls.length === 0) return []
const [item] = ls
const next =
(i: number = 1) =>
(curMatch: MatchGroupIndexed[]) =>
[...curMatch, ...check(index + i, ls.slice(i), expr)]
return checkExpr(expr, item, ls, index, next)
}
return {
groups: check(0, list, expr),
}
}
export const find = <T>([startO, expr, endO]: ListExpr, list: T[]): any => {
const check =
(expr: Expr) =>
<T>(x: T, i: number, ls: T[]): boolean => {
return pipe(
expr,
match<boolean, Expr>({
AnyItem: _ => true,
AnyNumber: _ => typeof x === 'number',
AnyString: _ => typeof x === 'string',
AnyBool: _ => typeof x === 'boolean',
Truthy: _ => !!x,
Falsey: _ => !x,
Group: ({ exprs }) => exprs.every(e => check(e)(x, i, ls)),
PropertyMatch: ({ name, expr }) =>
name in x && check(expr)(x[name], i, ls),
OneOrMore: ({ expr }) => {
// TODO: Nested quantified expression
const x = pipe(
list.slice(i),
takeLeftWhile(x => check(expr)(x, i, list)),
)
return true
},
_: _ => false,
}),
)
}
return list.filter((x, i, ls) => check(expr)(x, i, ls))
}
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