Incs/codemirror/keymap/emacs.js

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://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, ring, text) {
    if (text == null) text = cm.getRange(from, to);

    if (ring == "grow" && lastKill && lastKill.cm == cm && posEq(from, lastKill.pos) && cm.isClean(lastKill.gen))
      growRingTop(text);
    else if (ring !== false)
      addToRing(text);
    cm.replaceRange("", from, to, "+delete");

    if (ring == "grow") 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) {