Function applyTextInput

src/codemirror.js:1104–1149

(cm, inserted, deleted, sel, origin)

  var lastCopied = null;

  function applyTextInput(cm, inserted, deleted, sel, origin) {
    var doc = cm.doc;
    cm.display.shift = false;
    if (!sel) sel = doc.sel;

    var paste = cm.state.pasteIncoming || origin == "paste";
    var textLines = doc.splitLines(inserted), multiPaste = null
    // When pasing N lines into N selections, insert one line per selection
    if (paste && sel.ranges.length > 1) {
      if (lastCopied && lastCopied.text.join("\n") == inserted) {
        if (sel.ranges.length % lastCopied.text.length == 0) {
          multiPaste = [];
          for (var i = 0; i < lastCopied.text.length; i++)
            multiPaste.push(doc.splitLines(lastCopied.text[i]));
        }
      } else if (textLines.length == sel.ranges.length) {
        multiPaste = map(textLines, function(l) { return [l]; });
      }
    }

    // Normal behavior is to insert the new text into every selection
    for (var i = sel.ranges.length - 1; i >= 0; i--) {
      var range = sel.ranges[i];
      var from = range.from(), to = range.to();
      if (range.empty()) {
        if (deleted && deleted > 0) // Handle deletion
          from = Pos(from.line, from.ch - deleted);
        else if (cm.state.overwrite && !paste) // Handle overwrite
          to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
        else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
          from = to = Pos(from.line, 0)
      }
      var updateInput = cm.curOp.updateInput;
      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i % multiPaste.length] : textLines,
                         origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")};
      makeChange(cm.doc, changeEvent);
      signalLater(cm, "inputRead", cm, changeEvent);
    }
    if (inserted && !paste)
      triggerElectric(cm, inserted);

    ensureCursorVisible(cm);
    cm.curOp.updateInput = updateInput;
    cm.curOp.typing = true;
    cm.state.pasteIncoming = cm.state.cutIncoming = false;
  }

  function handlePaste(e, cm) {
    var pasted = e.clipboardData && e.clipboardData.getData("text/plain");