GPQAPP

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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  CodeMirror.defineOption("placeholder", "", function(cm, val, old) {
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    var prev = old && old != CodeMirror.Init;
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    if (val && !prev) {
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      cm.on("blur", onBlur);
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      cm.on("change", onChange);
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      cm.on("swapDoc", onChange);
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      CodeMirror.on(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose = function() { onComposition(cm) })
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      onChange(cm);
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    } else if (!val && prev) {
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      cm.off("blur", onBlur);
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      cm.off("change", onChange);
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      cm.off("swapDoc", onChange);
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      CodeMirror.off(cm.getInputField(), "compositionupdate", cm.state.placeholderCompose)
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      clearPlaceholder(cm);
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      var wrapper = cm.getWrapperElement();
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      wrapper.className = wrapper.className.replace(" CodeMirror-empty", "");
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    }
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    if (val && !cm.hasFocus()) onBlur(cm);
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  });
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  function clearPlaceholder(cm) {
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    if (cm.state.placeholder) {
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      cm.state.placeholder.parentNode.removeChild(cm.state.placeholder);
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      cm.state.placeholder = null;
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    }
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  }
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  function setPlaceholder(cm) {
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    clearPlaceholder(cm);
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    var elt = cm.state.placeholder = document.createElement("pre");
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    elt.style.cssText = "height: 0; overflow: visible";
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    elt.style.direction = cm.getOption("direction");
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    elt.className = "CodeMirror-placeholder CodeMirror-line-like";
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    var placeHolder = cm.getOption("placeholder")
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    if (typeof placeHolder == "string") placeHolder = document.createTextNode(placeHolder)
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    elt.appendChild(placeHolder)
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    cm.display.lineSpace.insertBefore(elt, cm.display.lineSpace.firstChild);
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  }
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  function onComposition(cm) {
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    setTimeout(function() {
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      var empty = false
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      if (cm.lineCount() == 1) {
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        var input = cm.getInputField()
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        empty = input.nodeName == "TEXTAREA" ? !cm.getLine(0).length
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          : !/[^\u200b]/.test(input.querySelector(".CodeMirror-line").textContent)
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      }
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      if (empty) setPlaceholder(cm)
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      else clearPlaceholder(cm)
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    }, 20)
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  }
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  function onBlur(cm) {
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    if (isEmpty(cm)) setPlaceholder(cm);
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  }
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  function onChange(cm) {
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    var wrapper = cm.getWrapperElement(), empty = isEmpty(cm);
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    wrapper.className = wrapper.className.replace(" CodeMirror-empty", "") + (empty ? " CodeMirror-empty" : "");
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    if (empty) setPlaceholder(cm);
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    else clearPlaceholder(cm);
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  }
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  function isEmpty(cm) {
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    return (cm.lineCount() === 1) && (cm.getLine(0) === "");
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  }
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});
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