@prismicio/types-internal/src/validators/TrimmedString.ts

Prismic types for Custom Types and Prismic Data

import { chain } from "fp-ts/Either"
import { pipe } from "fp-ts/function"
import * as t from "io-ts"

export type TrimmedStringC = t.Type<string, string, unknown>

function trimScalaStyle(s: string): string {
	let startAt = 0
	/* eslint-disable  @typescript-eslint/no-non-null-assertion */
	while (startAt < s.length && s[startAt]! <= " ") {
		startAt++
	}
	let endAt = s.length
	/* eslint-disable  @typescript-eslint/no-non-null-assertion */
	while (startAt < endAt && s[endAt - 1]! <= " ") {
		endAt--
	}
	return s.substring(startAt, endAt)
}

/** A codec that validates a Boolean and convert it as a string */
export default new t.Type<string, string, unknown>(
	"TrimmedString",
	t.string.is,
	(u, c) =>
		pipe(
			t.string.validate(u, c),
			chain((s) => {
				return t.success(trimScalaStyle(s))
			}),
		),
	(i) => i,
)