diff2html/src/utils.ts

const specials = [
  // Order matters for these
  '-',
  '[',
  ']',
  // Order doesn't matter for any of these
  '/',
  '{',
  '}',
  '(',
  ')',
  '*',
  '+',
  '?',
  '.',
  '\\',
  '^',
  '$',
  '|',
];

// All characters will be escaped with '\'
// even though only some strictly require it when inside of []
const regex = RegExp('[' + specials.join('\\') + ']', 'g');

/**
 * Escapes all required characters for safe usage inside a RegExp
 */
export function escapeForRegExp(str: string): string {
  return str.replace(regex, '\\$&');
}

/**
 * Converts all '\' in @path to unix style '/'
 */
export function unifyPath(path: string): string {
  return path ? path.replace(/\\/g, '/') : path;
}

/**
 * Create unique number identifier for @text
 */
export function hashCode(text: string): number {
  let i, chr, len;
  let hash = 0;

  for (i = 0, len = text.length; i < len; i++) {
    chr = text.charCodeAt(i);
    hash = (hash << 5) - hash + chr;
    hash |= 0; // Convert to 32bit integer
  }

  return hash;
}