src/main/webapp/plugins/editor.md/lib/codemirror/mode/spreadsheet/spreadsheet.js

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

  CodeMirror.defineMode("spreadsheet", function () {
    return {
      startState: function () {
        return {
          stringType: null,
          stack: []
        };
      },
      token: function (stream, state) {
        if (!stream) return;

        //check for state changes
        if (state.stack.length === 0) {
          //strings
          if ((stream.peek() == '"') || (stream.peek() == "'")) {
            state.stringType = stream.peek();
            stream.next(); // Skip quote
            state.stack.unshift("string");
          }
        }

        //return state
        //stack has
        switch (state.stack[0]) {
        case "string":
          while (state.stack[0] === "string" && !stream.eol()) {
            if (stream.peek() === state.stringType) {
              stream.next(); // Skip quote
              state.stack.shift(); // Clear flag
            } else if (stream.peek() === "\\") {
              stream.next();
              stream.next();
            } else {
              stream.match(/^.[^\\\"\']*/);
            }
          }
          return "string";

        case "characterClass":
          while (state.stack[0] === "characterClass" && !stream.eol()) {
            if (!(stream.match(/^[^\]\\]+/) || stream.match(/^\\./)))
              state.stack.shift();
          }
          return "operator";
        }

        var peek = stream.peek();