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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
type Delimiter = string | [begin: string, end: string];
const { isArray } = Array;
function getBeginToken(delimiter: Delimiter): string {  return isArray(delimiter) ? delimiter[0] : delimiter;}
function getEndToken(delimiter: Delimiter): string {  return isArray(delimiter) ? delimiter[1] : delimiter;}
function createRegExp(...dv: Delimiter[]): [RegExp, RegExp] {  const beginPattern = "(" + dv.map(getBeginToken).join("|") + ")";  const pattern = "^(" +    "\\ufeff?" + // Maybe byte order mark    beginPattern +    "$([\\s\\S]+?)" +    "^(?:" + dv.map(getEndToken).join("|") + ")\\s*" +    "$" +    (globalThis?.Deno?.build?.os === "windows" ? "\\r?" : "") +    "(?:\\n)?)";
  return [    new RegExp("^" + beginPattern + "$", "im"),    new RegExp(pattern, "im"),  ];}
const [RX_RECOGNIZE_YAML, RX_YAML] = createRegExp(  ["---yaml", "---"],  "= yaml =",  "---",);const [RX_RECOGNIZE_TOML, RX_TOML] = createRegExp(  ["---toml", "---"],  "\\+\\+\\+",  "= toml =",);const [RX_RECOGNIZE_JSON, RX_JSON] = createRegExp(  ["---json", "---"],  "= json =",);
export const MAP_FORMAT_TO_RECOGNIZER_RX = {  yaml: RX_RECOGNIZE_YAML,  toml: RX_RECOGNIZE_TOML,  json: RX_RECOGNIZE_JSON,} as const;
export const MAP_FORMAT_TO_EXTRACTOR_RX = {  yaml: RX_YAML,  toml: RX_TOML,  json: RX_JSON,} as const;