std/path/is_glob.ts

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.

/**
 * Test whether the given string is a glob.
 *
 * @example Usage
 * ```ts
 * import { isGlob } from "@std/path/is-glob";
 * import { assert } from "@std/assert";
 *
 * assert(!isGlob("foo/bar/../baz"));
 * assert(isGlob("foo/*ar/../baz"));
 * ```
 *
 * @param str String to test.
 * @returns `true` if the given string is a glob, otherwise `false`
 */
export function isGlob(str: string): boolean {
  const chars: Record<string, string> = { "{": "}", "(": ")", "[": "]" };
  const regex =
    /\\(.)|(^!|\*|\?|[\].+)]\?|\[[^\\\]]+\]|\{[^\\}]+\}|\(\?[:!=][^\\)]+\)|\([^|]+\|[^\\)]+\))/;

  if (str === "") {
    return false;
  }

  let match: RegExpExecArray | null;

  while ((match = regex.exec(str))) {
    if (match[2]) return true;
    let idx = match.index + match[0].length;

    // if an open bracket/brace/paren is escaped,
    // set the index to the next closing character
    const open = match[1];
    const close = open ? chars[open] : null;
    if (open && close) {
      const n = str.indexOf(close, idx);
      if (n !== -1) {
        idx = n + 1;
      }
    }

    str = str.slice(idx);
  }

  return false;
}