text: // 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) {
  
    CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
  
      var prev = old && old != CodeMirror.Init;
  
      if (val && !prev) {
  
        cm.on("blur", onBlur);
  
        cm.on("change", onChange);
  
        onChange(cm);
  
      } else if (!val && prev) {
  
        cm.off("blur", onBlur);
  
        cm.off("change", onChange);
  
        clearPlaceholder(cm);
  
        var wrapper = cm.getWrapperElement();
  
        wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
  
      }
  
  
  
      if (val && !cm.hasFocus()) onBlur(cm);
  
    });
  
  
  
    function clearPlaceholder(cm) {
  
      if (cm.state.placeholder) {
  
        cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
  
        cm.state.placeholder = null;
  
      }
  
    }
  
    function setPlaceholder(cm) {
  
      clearPlaceholder(cm);
  
      var elt = cm.state.placeholder = document.createElement("pre");
  
      elt.style.cssText = "height: 0; overflow: visible";
  
      elt.className = "CodeMirror-placeholder";
  
      elt.appendChild(document.createTextNode(cm.getOption("placeholder")));
  
      cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
  
    }
  
  
  
    function onBlur(cm) {
  
      if (isEmpty(cm)) setPlaceholder(cm);
  
    }
  
    function onChange(cm) {
  
      var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
  
      wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
  
  
  
      if (empty) setPlaceholder(cm);
  
      else clearPlaceholder(cm);
  
    }
  
  
  
    function isEmpty(cm) {
  
      return (cm.lineCount() === 1) && (cm.getLine(0) === "");
  
    }
  
  });
  
  