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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
type Delimiter = string | [begin: string, end: string];
function getBeginToken(delimiter: Delimiter): string {  return Array.isArray(delimiter) ? delimiter[0] : delimiter;}
function getEndToken(delimiter: Delimiter): string {  return Array.isArray(delimiter) ? delimiter[1] : delimiter;}
function createRegExps(delimiters: Delimiter[]): [RegExp, RegExp] {  const beginPattern = "(" + delimiters.map(getBeginToken).join("|") + ")";  const pattern = "^(" +    "\\ufeff?" + // Maybe byte order mark    beginPattern +    "$([\\s\\S]+?)" +    "^(?:" + delimiters.map(getEndToken).join("|") + ")\\s*" +    "$" +    (globalThis?.Deno?.build?.os === "windows" ? "\\r?" : "") +    "(?:\\n)?)";
  return [    new RegExp("^" + beginPattern + "$", "im"),    new RegExp(pattern, "im"),  ];}
const [RECOGNIZE_YAML_REGEXP, EXTRACT_YAML_REGEXP] = createRegExps(  [    ["---yaml", "---"],    "= yaml =",    "---",  ],);const [RECOGNIZE_TOML_REGEXP, EXTRACT_TOML_REGEXP] = createRegExps(  [    ["---toml", "---"],    "\\+\\+\\+",    "= toml =",  ],);const [RECOGNIZE_JSON_REGEXP, EXTRACT_JSON_REGEXP] = createRegExps(  [    ["---json", "---"],    "= json =",  ],);
export const RECOGNIZE_REGEXP_MAP = {  yaml: RECOGNIZE_YAML_REGEXP,  toml: RECOGNIZE_TOML_REGEXP,  json: RECOGNIZE_JSON_REGEXP,} as const;
export const EXTRACT_REGEXP_MAP = {  yaml: EXTRACT_YAML_REGEXP,  toml: EXTRACT_TOML_REGEXP,  json: EXTRACT_JSON_REGEXP,} as const;