Prism.languages.groovy = Prism.languages.extend('clike', {
  string: [
    {
      // https://groovy-lang.org/syntax.html#_dollar_slashy_string
      pattern:
        /("""|''')(?:[^\\]|\\[\s\S])*?\1|\$\/(?:[^/$]|\$(?:[/$]|(?![/$]))|\/(?!\$))*\/\$/,
      greedy: true,
    },
    {
      // TODO: Slash strings (e.g. /foo/) can contain line breaks but this will cause a lot of trouble with
      // simple division (see JS regex), so find a fix maybe?
      pattern: /(["'/])(?:\\.|(?!\1)[^\\\r\n])*\1/,
      greedy: true,
    },
  ],
  keyword:
    /\b(?:abstract|as|assert|boolean|break|byte|case|catch|char|class|const|continue|def|default|do|double|else|enum|extends|final|finally|float|for|goto|if|implements|import|in|instanceof|int|interface|long|native|new|package|private|protected|public|return|short|static|strictfp|super|switch|synchronized|this|throw|throws|trait|transient|try|void|volatile|while)\b/,
  number:
    /\b(?:0b[01_]+|0x[\da-f_]+(?:\.[\da-f_p\-]+)?|[\d_]+(?:\.[\d_]+)?(?:e[+-]?\d+)?)[glidf]?\b/i,
  operator: {
    pattern:
      /(^|[^.])(?:~|==?~?|\?[.:]?|\*(?:[.=]|\*=?)?|\.[@&]|\.\.<|\.\.(?!\.)|-[-=>]?|\+[+=]?|!=?|<(?:<=?|=>?)?|>(?:>>?=?|=)?|&[&=]?|\|[|=]?|\/=?|\^=?|%=?)/,
    lookbehind: true,
  },
  punctuation: /\.+|[{}[\];(),:$]/,
});

Prism.languages.insertBefore('groovy', 'string', {
  shebang: {
    pattern: /#!.+/,
    alias: 'comment',
  },
});

Prism.languages.insertBefore('groovy', 'punctuation', {
  'spock-block': /\b(?:and|cleanup|expect|given|setup|then|when|where):/,
});

Prism.languages.insertBefore('groovy', 'function', {
  annotation: {
    pattern: /(^|[^.])@\w+/,
    lookbehind: true,
    alias: 'punctuation',
  },
});

// Handle string interpolation
Prism.hooks.add('wrap', function (env) {
  if (env.language === 'groovy' && env.type === 'string') {
    var delimiter = env.content[0];

    if (delimiter != "'") {
      var pattern = /([^\\])(?:\$(?:\{.*?\}|[\w.]+))/;
      if (delimiter === '$') {
        pattern = /([^\$])(?:\$(?:\{.*?\}|[\w.]+))/;
      }

      // To prevent double HTML-encoding we have to decode env.content first
      env.content = env.content.replace(/&lt;/g, '<').replace(/&amp;/g, '&');

      env.content = Prism.highlight(env.content, {
        expression: {
          pattern: pattern,
          lookbehind: true,
          inside: Prism.languages.groovy,
        },
      });

      env.classes.push(delimiter === '/' ? 'regex' : 'gstring');
    }
  }
});