// ==UserScript==
// @name        <pre> to <textarea>
// @namespace   https://ateraimemo.com/
// @include     http://*
// @include     https://*
// @exclude     http://*.google.*
// @exclude     https://*.google.*
// @grant       none
// @description pre <-> textarea
// @version     1.0.10
// _==/UserScript==
// Double Click <PRE>, open <TEXTAREA>
// Test: Clipboard API and events
// Fork of <pre> to <textarea> http://userscripts.org/scripts/show/11438
// original author is Sybian http://d.hatena.ne.jp/Sybian/
// _@name        <pre> to <textarea>
// _@namespace   http://d.hatena.ne.jp/Sybian/
// _@include     http://*
// _@description pre <-> textarea
// _@version     1.0.2
// Ctrl+Click <PRE>, become <TEXTAREA>
// ESC or Ctrl+[ or Ctrl+Shift+Click in <TEXTAREA>, restore <PRE>
(function () {
  window.URL = window.URL || window.webkitURL;
  function makeDownloadLink(text, mimeType, fileName) {
    var blob = new Blob([text], {
      type: mimeType + ';charset=UTF-8'
    }),
    a = document.createElement('a'); //,
    //dndlistener = function(e) {
    //  switch(e.type) {
    //  case 'dragstart':
    //    e.dataTransfer.setData("DownloadURL", [mimeType,fileName,this.href].join(':'));
    //    break;
    //  case 'dragend':
    //    window.URL.revokeObjectURL(this.href);
    //    this.parentNode.removeChild(this);
    //  }
    //};
    //a.addEventListener("dragstart", dndlistener, false);
    //a.addEventListener('dragend',   dndlistener, false);
    a.innerHTML = 'Download: ' + fileName;
    a.setAttribute('download', fileName);
    //a.href = "javascript:void(0)";
    //a.setAttribute("onclick", "window.saveAs(blob, 'tempfile.java');");
    a.href = window.URL.createObjectURL(blob);
    //if(window.createObjectURL) {
    //  a.href = window.createObjectURL(blob);
    //}else if(window.createBlobURL) {
    //  a.href = window.createBlobURL(blob);
    //}else if(window.URL && window.URL.createObjectURL) {
    //  a.href = window.URL.createObjectURL(blob);
    //}else if(window.webkitURL && window.webkitURL.createObjectURL) {
    //  a.href = window.webkitURL.createObjectURL(blob);
    //}
    return a;
  }
  function getFileName(code) {
    var r = code.match(/public(?:\s|final)+(?:class|interface|enum)\s+([^<{\s]+)/m);
    return (r ? r[1] : 'Unknown') + '.java';
  }
  function pre2text(pre) {
    var div = document.createElement('div'); //dummy div
    div.innerHTML = pre.innerHTML.replace(/<br[ \/]*>/gi, '\n').replace(/<.*?>/gm, '');
    return div.childNodes[0].nodeValue.replace(/\xA0/g, ' '); //replace &nbsp;
  }
  function cleanup(tx) {
    var a = tx.downloadLink;
    tx.parentNode.replaceChild(tx.originalPre, tx);
    if (a != null && a.parentNode) {
      window.URL.revokeObjectURL(a.href);
      a.parentNode.removeChild(a);
    }
  }
  var listener = function (e) {
    var closeListener = function (e) {
      switch (e.type) {
          //case 'copy':
          //case 'cut':
          //  var dataTransfer = e.clipboardData;
          //  dataTransfer.items.add(this.innerText, 'text/plain');
          //  cleanup(this);
          //  e.preventDefault();
          //  break;
        case 'keydown':
          if (e.keyCode == '27') { // ESC
            cleanup(this);
          }
          break;
        case 'dblclick':
          cleanup(this);
      }
    },
    rect = this.getBoundingClientRect(),
    tx = document.createElement('textarea');
    //tx.addEventListener('copy',     closeListener, false);
    //tx.addEventListener('cut',      closeListener, false);
    tx.addEventListener('keydown', closeListener, false);
    tx.addEventListener('dblclick', closeListener, false);
    //parseInt(getComputedStyle(this,"").width).toString()+"px";
    tx.style.width = rect.width + 'px';
    tx.style.height = (rect.height > 240 ? 240 : rect.height) + 'px';
    tx.originalPre = this;
    tx.value = pre2text(this);
    this.tx = tx;
    this.parentNode.replaceChild(this.tx, this);
    this.tx.focus();
    this.tx.select();
    //chrome ext???
    //alert(document.execCommand("copy", false, null));
    //name = getFileName(tx.value),
    //name = ((ret = prompt("FileName", name))!=null) ? ret : name;
    tx.downloadLink = makeDownloadLink(tx.value, 'text/plain', getFileName(tx.value));
    tx.parentNode.insertBefore(tx.downloadLink, tx.nextSibling);
    tx.downloadLink.click();
  },
  pre = document.getElementsByTagName('pre'),
  i = 0,
  len = pre.length;
  for (; i < len; i++) {
    pre[i].addEventListener('dblclick', listener, false);
  }
}());