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// https://www.freedesktop.org/software/systemd/man/systemd.syntax.html

(function (Prism) {
  var comment = {
    pattern: /^[;#].*/m,
    greedy: true,
  };

  var quotesSource = /"(?:[^\r\n"\\]|\\(?:[^\r]|\r\n?))*"(?!\S)/.source;

  Prism.languages.systemd = {
    comment: comment,

    section: {
      pattern: /^\[[^\n\r\[\]]*\](?=[ \t]*$)/m,
      greedy: true,
      inside: {
        punctuation: /^\[|\]$/,
        'section-name': {
          pattern: /[\s\S]+/,
          alias: 'selector',
        },
      },
    },

    key: {
      pattern: /^[^\s=]+(?=[ \t]*=)/m,
      greedy: true,
      alias: 'attr-name',
    },
    value: {
      // This pattern is quite complex because of two properties:
      //  1) Quotes (strings) must be preceded by a space. Since we can't use lookbehinds, we have to "resolve"
      //     the lookbehind. You will see this in the main loop where spaces are handled separately.
      //  2) Line continuations.
      //     After line continuations, empty lines and comments are ignored so we have to consume them.
      pattern: RegExp(
        /(=[ \t]*(?!\s))/.source +
          // the value either starts with quotes or not
          '(?:' +
          quotesSource +
          '|(?=[^"\r\n]))' +
          // main loop
          '(?:' +
          (/[^\s\\]/.source +
            // handle spaces separately because of quotes
            '|' +
            '[ \t]+(?:(?![ \t"])|' +
            quotesSource +
            ')' +
            // line continuation
            '|' +
            /\\[\r\n]+(?:[#;].*[\r\n]+)*(?![#;])/.source) +
          ')*'
      ),
      lookbehind: true,
      greedy: true,
      alias: 'attr-value',
      inside: {
        comment: comment,
        quoted: {
          pattern: RegExp(/(^|\s)/.source + quotesSource),
          lookbehind: true,
          greedy: true,
        },
        punctuation: /\\$/m,

        boolean: {
          pattern: /^(?:false|no|off|on|true|yes)$/,
          greedy: true,
        },
      },
    },

    operator: /=/,
  };
})(Prism);