Function urlToRegex

valdi/vscode_debugger/src/common/urlUtils.ts:297–343

(aPath: string, escapeRegex = true)

 * Converts and escape the file URL to a regular expression.
 */
export function urlToRegex(aPath: string, escapeRegex = true) {
  const patterns: string[] = [];

  // aPath will often (always?) be provided as a file URI, or URL. Decode it
  // --we'll reencode it as we go--and also create a match for its absolute
  // path.
  //
  // This de- and re-encoding is important for special characters, since:
  //  - It comes in like "file:///c:/foo/%F0%9F%92%A9.js"
  //  - We decode it to file:///c:/foo/💩.js
  //  - For case insensitive systems, we generate a regex like [fF][oO][oO]/(?:💩|%F0%9F%92%A9).[jJ][sS]
  //  - If we didn't de-encode it, the percent would be case-insensitized as
  //    well and we would not include the original character in the regex
  for (const str of [decodeURI(aPath), fileUrlToAbsolutePath(aPath)]) {
    if (!str) {
      continue;
    }

    // Loop through each character of the string. Convert the char to a regex,
    // creating a group, and then appent that to the match.
    const chars = new Set<string>();
    let re = '';
    for (const char of str) {
      if (isCaseSensitive) {
        urlToRegexChar(char, chars, escapeRegex);
      } else {
        urlToRegexChar(char.toLowerCase(), chars, escapeRegex);
        urlToRegexChar(char.toUpperCase(), chars, escapeRegex);
      }

      re += createReGroup(chars);
      chars.clear();
    }

    // If we're on windows but not case sensitive (i.e. we didn't expand a
    // fancy regex above), replace `file:///c:/` or simple `c:/` patterns with
    // an insensitive drive letter.
    patterns.push(
      re.replace(
        /^(file:\\\/\\\/\\\/)?([a-z]):/i,
        (_, file = '', letter) => `${file}[${letter.toUpperCase()}${letter.toLowerCase()}]:`,
      ),
    );
  }

  return patterns.join('|');
}

/**
 * Opaque typed used to indicate strings that are file URLs.