/**
 * Original by Scott Helme.
 *
 * Reference: https://scotthelme.co.uk/csp-cheat-sheet/
 *
 * Supports the following:
 *  - https://www.w3.org/TR/CSP1/
 *  - https://www.w3.org/TR/CSP2/
 *  - https://www.w3.org/TR/CSP3/
 */

(function (Prism) {
  /**
   * @param {string} source
   * @returns {RegExp}
   */
  function value(source) {
    return RegExp(
      /([ \t])/.source + '(?:' + source + ')' + /(?=[\s;]|$)/.source,
      'i'
    );
  }

  Prism.languages.csp = {
    directive: {
      pattern:
        /(^|[\s;])(?:base-uri|block-all-mixed-content|(?:child|connect|default|font|frame|img|manifest|media|object|prefetch|script|style|worker)-src|disown-opener|form-action|frame-(?:ancestors|options)|input-protection(?:-(?:clip|selectors))?|navigate-to|plugin-types|policy-uri|referrer|reflected-xss|report-(?:to|uri)|require-sri-for|sandbox|(?:script|style)-src-(?:attr|elem)|upgrade-insecure-requests)(?=[\s;]|$)/i,
      lookbehind: true,
      alias: 'property',
    },
    scheme: {
      pattern: value(/[a-z][a-z0-9.+-]*:/.source),
      lookbehind: true,
    },
    none: {
      pattern: value(/'none'/.source),
      lookbehind: true,
      alias: 'keyword',
    },
    nonce: {
      pattern: value(/'nonce-[-+/\w=]+'/.source),
      lookbehind: true,
      alias: 'number',
    },
    hash: {
      pattern: value(/'sha(?:256|384|512)-[-+/\w=]+'/.source),
      lookbehind: true,
      alias: 'number',
    },
    host: {
      pattern: value(
        /[a-z][a-z0-9.+-]*:\/\/[^\s;,']*/.source +
          '|' +
          /\*[^\s;,']*/.source +
          '|' +
          /[a-z0-9-]+(?:\.[a-z0-9-]+)+(?::[\d*]+)?(?:\/[^\s;,']*)?/.source
      ),
      lookbehind: true,
      alias: 'url',
      inside: {
        important: /\*/,
      },
    },
    keyword: [
      {
        pattern: value(/'unsafe-[a-z-]+'/.source),
        lookbehind: true,
        alias: 'unsafe',
      },
      {
        pattern: value(/'[a-z-]+'/.source),
        lookbehind: true,
        alias: 'safe',
      },
    ],
    punctuation: /;/,
  };
})(Prism);