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Prism.languages['excel-formula'] = {
  comment: {
    pattern: /(\bN\(\s*)"(?:[^"]|"")*"(?=\s*\))/i,
    lookbehind: true,
    greedy: true,
  },
  string: {
    pattern: /"(?:[^"]|"")*"(?!")/,
    greedy: true,
  },
  reference: {
    // https://www.ablebits.com/office-addins-blog/2015/12/08/excel-reference-another-sheet-workbook/

    // Sales!B2
    // 'Winter sales'!B2
    // [Sales.xlsx]Jan!B2:B5
    // D:\Reports\[Sales.xlsx]Jan!B2:B5
    // '[Sales.xlsx]Jan sales'!B2:B5
    // 'D:\Reports\[Sales.xlsx]Jan sales'!B2:B5

    pattern:
      /(?:'[^']*'|(?:[^\s()[\]{}<>*?"';,$&]*\[[^^\s()[\]{}<>*?"']+\])?\w+)!/,
    greedy: true,
    alias: 'string',
    inside: {
      operator: /!$/,
      punctuation: /'/,
      sheet: {
        pattern: /[^[\]]+$/,
        alias: 'function',
      },
      file: {
        pattern: /\[[^[\]]+\]$/,
        inside: {
          punctuation: /[[\]]/,
        },
      },
      path: /[\s\S]+/,
    },
  },
  'function-name': {
    pattern: /\b[A-Z]\w*(?=\()/i,
    alias: 'builtin',
  },
  range: {
    pattern:
      /\$?\b(?:[A-Z]+\$?\d+:\$?[A-Z]+\$?\d+|[A-Z]+:\$?[A-Z]+|\d+:\$?\d+)\b/i,
    alias: 'selector',
    inside: {
      operator: /:/,
      cell: /\$?[A-Z]+\$?\d+/i,
      column: /\$?[A-Z]+/i,
      row: /\$?\d+/,
    },
  },
  cell: {
    // Excel is case insensitive, so the string "foo1" could be either a variable or a cell.
    // To combat this, we match cells case insensitive, if the contain at least one "$", and case sensitive otherwise.
    pattern: /\b[A-Z]+\d+\b|\$[A-Za-z]+\$?\d+\b|\b[A-Za-z]+\$\d+\b/,
    alias: 'selector',
  },
  number: /(?:\b\d+(?:\.\d+)?|\B\.\d+)(?:e[+-]?\d+)?\b/i,
  boolean: /\b(?:FALSE|TRUE)\b/i,
  operator: /[-+*/^%=&,]|<[=>]?|>=?/,
  punctuation: /[[\]();{}|]/,
};

Prism.languages['xlsx'] = Prism.languages['xls'] =
  Prism.languages['excel-formula'];