// https://wren.io/

Prism.languages.wren = {
  // Multiline comments in Wren can have nested multiline comments
  // Comments: // and /* */
  comment: [
    {
      // support 3 levels of nesting
      // regex: \/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|<self>)*\*\/
      pattern:
        /\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*))*\*\/)*\*\/)*\*\//,
      greedy: true,
    },
    {
      pattern: /(^|[^\\:])\/\/.*/,
      lookbehind: true,
      greedy: true,
    },
  ],

  // Triple quoted strings are multiline but cannot have interpolation (raw strings)
  // Based on prism-python.js
  'triple-quoted-string': {
    pattern: /"""[\s\S]*?"""/,
    greedy: true,
    alias: 'string',
  },

  // see below
  'string-literal': null,

  // #!/usr/bin/env wren on the first line
  hashbang: {
    pattern: /^#!\/.+/,
    greedy: true,
    alias: 'comment',
  },

  // Attributes are special keywords to add meta data to classes
  attribute: {
    // #! attributes are stored in class properties
    // #!myvar = true
    // #attributes are not stored and dismissed at compilation
    pattern: /#!?[ \t\u3000]*\w+/,
    alias: 'keyword',
  },
  'class-name': [
    {
      // class definition
      // class Meta {}
      pattern: /(\bclass\s+)\w+/,
      lookbehind: true,
    },
    // A class must always start with an uppercase.
    // File.read
    /\b[A-Z][a-z\d_]*\b/,
  ],

  // A constant can be a variable, class, property or method. Just named in all uppercase letters
  constant: /\b[A-Z][A-Z\d_]*\b/,

  null: {
    pattern: /\bnull\b/,
    alias: 'keyword',
  },
  keyword:
    /\b(?:as|break|class|construct|continue|else|for|foreign|if|import|in|is|return|static|super|this|var|while)\b/,
  boolean: /\b(?:false|true)\b/,
  number: /\b(?:0x[\da-f]+|\d+(?:\.\d+)?(?:e[+-]?\d+)?)\b/i,

  // Functions can be Class.method()
  function: /\b[a-z_]\w*(?=\s*[({])/i,

  operator: /<<|>>|[=!<>]=?|&&|\|\||[-+*/%~^&|?:]|\.{2,3}/,
  punctuation: /[\[\](){}.,;]/,
};

Prism.languages.wren['string-literal'] = {
  // A single quote string is multiline and can have interpolation (similar to JS backticks ``)
  pattern:
    /(^|[^\\"])"(?:[^\\"%]|\\[\s\S]|%(?!\()|%\((?:[^()]|\((?:[^()]|\([^)]*\))*\))*\))*"/,
  lookbehind: true,
  greedy: true,
  inside: {
    interpolation: {
      // "%(interpolation)"
      pattern:
        /((?:^|[^\\])(?:\\{2})*)%\((?:[^()]|\((?:[^()]|\([^)]*\))*\))*\)/,
      lookbehind: true,
      inside: {
        expression: {
          pattern: /^(%\()[\s\S]+(?=\)$)/,
          lookbehind: true,
          inside: Prism.languages.wren,
        },
        'interpolation-punctuation': {
          pattern: /^%\(|\)$/,
          alias: 'punctuation',
        },
      },
    },
    string: /[\s\S]+/,
  },
};