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) {
    "use strict";
  
    var Pos = CodeMirror.Pos;
    function posEq(a, b) { return a.line == b.line && a.ch == b.ch; }
  
    // Kill 'ring'
  
    var killRing = [];
    function addToRing(str) {
      killRing.push(str);
      if (killRing.length > 50) killRing.shift();
    }
    function growRingTop(str) {
      if (!killRing.length) return addToRing(str);
      killRing[killRing.length - 1] += str;
    }
    function getFromRing(n) { return killRing[killRing.length - (n ? Math.min(n, 1) : 1)] || ""; }
    function popFromRing() { if (killRing.length > 1) killRing.pop(); return getFromRing(); }
  
    var lastKill = null;
  
    function kill(cm, from, to, mayGrow, text) {
      if (text == null) text = cm.getRange(from, to);
  
      if (mayGrow && lastKill && lastKill.cm == cm && posEq(from, lastKill.pos) && cm.isClean(lastKill.gen))
        growRingTop(text);
      else
        addToRing(text);
      cm.replaceRange("", from, to, "+delete");
  
      if (mayGrow) lastKill = {cm: cm, pos: from, gen: cm.changeGeneration()};
      else lastKill = null;
    }
  
    // Boundaries of various units
  
    function byChar(cm, pos, dir) {
      return cm.findPosH(pos, dir, "char", true);
    }
  
    function byWord(cm, pos, dir) {
      return cm.findPosH(pos, dir, "word", true);
    }
  
    function byLine(cm, pos, dir) {
      return cm.findPosV(pos, dir, "line", cm.doc.sel.goalColumn);
    }
  
    function byPage(cm, pos, dir) {
      return cm.findPosV(pos, dir, "page", cm.doc.sel.goalColumn);
    }
  
    function byParagraph(cm, pos, dir) {
      var no = pos.line, line = cm.getLine(no);
      var sawText = /\S/.test(dir < 0 ? line.slice(0, pos.ch) : line.slice(pos.ch));
      var fst = cm.firstLine(), lst = cm.lastLine();
      for (;;) {
        no += dir;
        if (no < fst || no > lst)
          return cm.clipPos(Pos(no - dir, dir < 0 ? 0 : null));
        line = cm.getLine(no);
        var hasText = /\S/.test(line);
        if (hasText) sawText = true;
        else if (sawText) return Pos(no, 0);
      }
    }
  
    function bySentence(cm, pos, dir) {
      var line = pos.line, ch = pos.ch;
      var text = cm.getLine(pos.line), sawWord = false;
      for (;;) {
        var next = text.charAt(ch + (dir < 0 ? -1 : 0));
        if (!next) { // End/beginning of line reached
          if (line == (dir < 0 ? cm.firstLine() : cm.lastLine())) return Pos(line, ch);
          text = cm.getLine(line + dir);
          if (!/\S/.test(text)) return Pos(line, ch);
          line += dir;
          ch = dir < 0 ? text.length : 0;
          continue;
        }
        if (sawWord && /[!?.]/.test(next)) return Pos(line, ch + (dir > 0 ? 1 : 0));
        if (!sawWord) sawWord = /\w/.test(next);
        ch += dir;
      }
    }
  
    function byExpr(cm, pos, dir) {
      var wrap;
      if (cm.findMatchingBracket && (wrap = cm.findMatchingBracket(pos, {strict: true}))
          && wrap.match && (wrap.forward ? 1 : -1) == dir)
        return dir > 0 ? Pos(wrap.to.line, wrap.to.ch + 1) : wrap.to;
  
      for (var first = true;; first = false) {
        var token = cm.getTokenAt(pos);
        var after = Pos(pos.line, dir < 0 ? token.start : token.end);
        if (first && dir > 0 && token.end == pos.ch || !/\w/.test(token.string)) {
          var newPos = cm.findPosH(after, dir, "char");
          if (posEq(after, newPos)) return pos;
          else pos = newPos;
        } else {
          return after;
        }
      }
    }
  
    // Prefixes (only crudely supported)
  
    function getPrefix(cm, precise) {
      var digits = cm.state.emacsPrefix;
      if (!digits) return precise ? null : 1;
      clearPrefix(cm);
      return digits == "-" ? -1 : Number(digits);
    }
  
    function repeated(cmd) {
      var f = typeof cmd == "string" ? function(cm) { cm.execCommand(cmd); } : cmd;
      return function(cm) {
        var prefix = getPrefix(cm);
        f(cm);
        for (var i = 1; i < prefix; ++i) f(cm);
      };
    }
  
    function findEnd(cm, pos, by, dir) {
      var prefix = getPrefix(cm);
      if (prefix < 0) { dir = -dir; prefix = -prefix; }
      for (var i = 0; i < prefix; ++i) {
        var newPos = by(cm, pos, dir);
        if (posEq(newPos, pos)) break;
        pos = newPos;
      }
      return pos;
    }
  
    function move(by, dir) {
      var f = function(cm) {
        cm.extendSelection(findEnd(cm, cm.getCursor(), by, dir));
      };
      f.motion = true;
      return f;
    }
  
    function killTo(cm, by, dir) {
      var selections = cm.listSelections(), cursor;
      var i = selections.length;
      while (i--) {
        cursor = selections[i].head;
        kill(cm, cursor, findEnd(cm, cursor, by, dir), true);
      }
    }
  
    function killRegion(cm) {
      if (cm.somethingSelected()) {
        var selections = cm.listSelections(), selection;
        var i = selections.length;
        while (i--) {
          selection = selections[i];
          kill(cm, selection.anchor, selection.head);
        }
        return true;
      }
    }
  
    function addPrefix(cm, digit) {
      if (cm.state.emacsPrefix) {
        if (digit != "-") cm.state.emacsPrefix += digit;
        return;
      }
      // Not active yet
      cm.state.emacsPrefix = digit;
      cm.on("keyHandled", maybeClearPrefix);
      cm.on("inputRead", maybeDuplicateInput);
    }
  
    var prefixPreservingKeys = {"Alt-G": true, "Ctrl-X": true, "Ctrl-Q": true, "Ctrl-U": true};
  
    function maybeClearPrefix(cm, arg) {
      if (!cm.state.emacsPrefixMap && !prefixPreservingKeys.hasOwnProperty(arg))
        clearPrefix(cm);
    }
  
    function clearPrefix(cm) {
      cm.state.emacsPrefix = null;
      cm.off("keyHandled", maybeClearPrefix);
      cm.off("inputRead", maybeDuplicateInput);
    }
  
    function maybeDuplicateInput(cm, event) {
      var dup = getPrefix(cm);
      if (dup > 1 && event.origin == "+input") {
        var one = event.text.join("\n"), txt = "";
        for (var i = 1; i < dup; ++i) txt += one;
        cm.replaceSelection(txt);
      }
    }
  
    function addPrefixMap(cm) {
      cm.state.emacsPrefixMap = true;
      cm.addKeyMap(prefixMap);
      cm.on("keyHandled", maybeRemovePrefixMap);
      cm.on("inputRead", maybeRemovePrefixMap);
    }
  
    function maybeRemovePrefixMap(cm, arg) {
      if (typeof arg == "string" && (/^\d$/.test(arg) || arg == "Ctrl-U")) return;
      cm.removeKeyMap(prefixMap);
      cm.state.emacsPrefixMap = false;
      cm.off("keyHandled", maybeRemovePrefixMap);
      cm.off("inputRead", maybeRemovePrefixMap);
    }
  
    // Utilities
  
    function setMark(cm) {
      cm.setCursor(cm.getCursor());
      cm.setExtending(!cm.getExtending());
      cm.on("change", function() { cm.setExtending(false); });
    }
  
    function clearMark(cm) {
      cm.setExtending(false);
      cm.setCursor(cm.getCursor());
    }
  
    function getInput(cm, msg, f) {
      if (cm.openDialog)
        cm.openDialog(msg + ": <input type=\"text\" style=\"width: 10em\"/>", f, {bottom: true});
      else
        f(prompt(msg, ""));
    }
  
    function operateOnWord(cm, op) {
      var start = cm.getCursor(), end = cm.findPosH(start, 1, "word");
      cm.replaceRange(op(cm.getRange(start, end)), start, end);
      cm.setCursor(end);
    }
  
    function toEnclosingExpr(cm) {
      var pos = cm.getCursor(), line = pos.line, ch = pos.ch;
      var stack = [];
      while (line >= cm.firstLine()) {
        var text = cm.getLine(line);
        for (var i = ch == null ? text.length : ch; i > 0;) {
          var ch = text.charAt(--i);
          if (ch == ")")
            stack.push("(");
          else if (ch == "]")
            stack.push("[");
          else if (ch == "}")
            stack.push("{");
          else if (/[\(\{\[]/.test(ch) && (!stack.length || stack.pop() != ch))
            return cm.extendSelection(Pos(line, i));
        }
        --line; ch = null;
      }
    }
  
    function quit(cm) {
      cm.execCommand("clearSearch");
      clearMark(cm);
    }
  
    CodeMirror.emacs = {kill: kill, killRegion: killRegion, repeated: repeated};
  
    // Actual keymap
  
    var keyMap = CodeMirror.keyMap.emacs = CodeMirror.normalizeKeyMap({
      "Ctrl-W": function(cm) {kill(cm, cm.getCursor("start"), cm.getCursor("end"));},
      "Ctrl-K": repeated(function(cm) {
        var start = cm.getCursor(), end = cm.clipPos(Pos(start.line));
        var text = cm.getRange(start, end);
        if (!/\S/.test(text)) {
          text += "\n";
          end = Pos(start.line + 1, 0);
        }
        kill(cm, start, end, true, text);
      }),
      "Alt-W": function(cm) {
        addToRing(cm.getSelection());
        clearMark(cm);
      },
      "Ctrl-Y": function(cm) {
        var start = cm.getCursor();
        cm.replaceRange(getFromRing(getPrefix(cm)), start, start, "paste");
        cm.setSelection(start, cm.getCursor());
      },
      "Alt-Y": function(cm) {cm.replaceSelection(popFromRing(), "around", "paste");},
  
      "Ctrl-Space": setMark, "Ctrl-Shift-2": setMark,
  
      "Ctrl-F": move(byChar, 1), "Ctrl-B": move(byChar, -1),
      "Right": move(byChar, 1), "Left": move(byChar, -1),
      "Ctrl-D": function(cm) { killTo(cm, byChar, 1); },
      "Delete": function(cm) { killRegion(cm) || killTo(cm, byChar, 1); },
      "Ctrl-H": function(cm) { killTo(cm, byChar, -1); },
      "Backspace": function(cm) { killRegion(cm) || killTo(cm, byChar, -1); },
  
      "Alt-F": move(byWord, 1), "Alt-B": move(byWord, -1),
      "Alt-D": function(cm) { killTo(cm, byWord, 1); },
      "Alt-Backspace": function(cm) { killTo(cm, byWord, -1); },
  
      "Ctrl-N": move(byLine, 1), "Ctrl-P": move(byLine, -1),
      "Down": move(byLine, 1), "Up": move(byLine, -1),
      "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
      "End": "goLineEnd", "Home": "goLineStart",
  
      "Alt-V": move(byPage, -1), "Ctrl-V": move(byPage, 1),
      "PageUp": move(byPage, -1), "PageDown": move(byPage, 1),
  
      "Ctrl-Up": move(byParagraph, -1), "Ctrl-Down": move(byParagraph, 1),
  
      "Alt-A": move(bySentence, -1), "Alt-E": move(bySentence, 1),
      "Alt-K": function(cm) { killTo(cm, bySentence, 1); },
  
      "Ctrl-Alt-K": function(cm) { killTo(cm, byExpr, 1); },
      "Ctrl-Alt-Backspace": function(cm) { killTo(cm, byExpr, -1); },
      "Ctrl-Alt-F": move(byExpr, 1), "Ctrl-Alt-B": move(byExpr, -1),
  
      "Shift-Ctrl-Alt-2": function(cm) {
        var cursor = cm.getCursor();
        cm.setSelection(findEnd(cm, cursor, byExpr, 1), cursor);
      },
      "Ctrl-Alt-T": function(cm) {
        var leftStart = byExpr(cm, cm.getCursor(), -1), leftEnd = byExpr(cm, leftStart, 1);
        var rightEnd = byExpr(cm, leftEnd, 1), rightStart = byExpr(cm, rightEnd, -1);
        cm.replaceRange(cm.getRange(rightStart, rightEnd) + cm.getRange(leftEnd, rightStart) +
                        cm.getRange(leftStart, leftEnd), leftStart, rightEnd);
      },
      "Ctrl-Alt-U": repeated(toEnclosingExpr),
  
      "Alt-Space": function(cm) {
        var pos = cm.getCursor(), from = pos.ch, to = pos.ch, text = cm.getLine(pos.line);
        while (from && /\s/.test(text.charAt(from - 1))) --from;
        while (to < text.length && /\s/.test(text.charAt(to))) ++to;
        cm.replaceRange(" ", Pos(pos.line, from), Pos(pos.line, to));
      },
      "Ctrl-O": repeated(function(cm) { cm.replaceSelection("\n", "start"); }),
      "Ctrl-T": repeated(function(cm) {
        cm.execCommand("transposeChars");
      }),
  
      "Alt-C": repeated(function(cm) {
        operateOnWord(cm, function(w) {
          var letter = w.search(/\w/);
          if (letter == -1) return w;
          return w.slice(0, letter) + w.charAt(letter).toUpperCase() + w.slice(letter + 1).toLowerCase();
        });
      }),
      "Alt-U": repeated(function(cm) {
        operateOnWord(cm, function(w) { return w.toUpperCase(); });
      }),
      "Alt-L": repeated(function(cm) {
        operateOnWord(cm, function(w) { return w.toLowerCase(); });
      }),
  
      "Alt-;": "toggleComment",
  
      "Ctrl-/": repeated("undo"), "Shift-Ctrl--": repeated("undo"),
      "Ctrl-Z": repeated("undo"), "Cmd-Z": repeated("undo"),
      "Shift-Alt-,": "goDocStart", "Shift-Alt-.": "goDocEnd",
      "Ctrl-S": "findNext", "Ctrl-R": "findPrev", "Ctrl-G": quit, "Shift-Alt-5": "replace",
      "Alt-/": "autocomplete",
      "Enter": "newlineAndIndent",
      "Ctrl-J": repeated(function(cm) { cm.replaceSelection("\n", "end"); }),
      "Tab": "indentAuto",
  
      "Alt-G G": function(cm) {
        var prefix = getPrefix(cm, true);
        if (prefix != null && prefix > 0) return cm.setCursor(prefix - 1);
  
        getInput(cm, "Goto line", function(str) {
          var num;
          if (str && !isNaN(num = Number(str)) && num == (num|0) && num > 0)
            cm.setCursor(num - 1);
        });
      },
  
      "Ctrl-X Tab": function(cm) {
        cm.indentSelection(getPrefix(cm, true) || cm.getOption("indentUnit"));
      },
      "Ctrl-X Ctrl-X": function(cm) {
        cm.setSelection(cm.getCursor("head"), cm.getCursor("anchor"));
      },
      "Ctrl-X Ctrl-S": "save",
      "Ctrl-X Ctrl-W": "save",
      "Ctrl-X S": "saveAll",
      "Ctrl-X F": "open",
      "Ctrl-X U": repeated("undo"),
      "Ctrl-X K": "close",
      "Ctrl-X Delete": function(cm) { kill(cm, cm.getCursor(), bySentence(cm, cm.getCursor(), 1), true); },
      "Ctrl-X H": "selectAll",
  
      "Ctrl-Q Tab": repeated("insertTab"),
      "Ctrl-U": addPrefixMap
    });
  
    var prefixMap = {"Ctrl-G": clearPrefix};
    function regPrefix(d) {
      prefixMap[d] = function(cm) { addPrefix(cm, d); };
      keyMap["Ctrl-" + d] = function(cm) { addPrefix(cm, d); };
      prefixPreservingKeys["Ctrl-" + d] = true;
    }
    for (var i = 0; i < 10; ++i) regPrefix(String(i));
    regPrefix("-");
  });
  