Prism.languages.squirrel = Prism.languages.extend('clike', {
  comment: [
    Prism.languages.clike['comment'][0],
    {
      pattern: /(^|[^\\:])(?:\/\/|#).*/,
      lookbehind: true,
      greedy: true,
    },
  ],
  string: {
    pattern: /(^|[^\\"'@])(?:@"(?:[^"]|"")*"(?!")|"(?:[^\\\r\n"]|\\.)*")/,
    lookbehind: true,
    greedy: true,
  },

  'class-name': {
    pattern: /(\b(?:class|enum|extends|instanceof)\s+)\w+(?:\.\w+)*/,
    lookbehind: true,
    inside: {
      punctuation: /\./,
    },
  },
  keyword:
    /\b(?:__FILE__|__LINE__|base|break|case|catch|class|clone|const|constructor|continue|default|delete|else|enum|extends|for|foreach|function|if|in|instanceof|local|null|resume|return|static|switch|this|throw|try|typeof|while|yield)\b/,

  number: /\b(?:0x[0-9a-fA-F]+|\d+(?:\.(?:\d+|[eE][+-]?\d+))?)\b/,
  operator: /\+\+|--|<=>|<[-<]|>>>?|&&?|\|\|?|[-+*/%!=<>]=?|[~^]|::?/,
  punctuation: /[(){}\[\],;.]/,
});

Prism.languages.insertBefore('squirrel', 'string', {
  char: {
    pattern: /(^|[^\\"'])'(?:[^\\']|\\(?:[xuU][0-9a-fA-F]{0,8}|[\s\S]))'/,
    lookbehind: true,
    greedy: true,
  },
});

Prism.languages.insertBefore('squirrel', 'operator', {
  'attribute-punctuation': {
    pattern: /<\/|\/>/,
    alias: 'important',
  },
  lambda: {
    pattern: /@(?=\()/,
    alias: 'operator',
  },
});