Function readInput

docs/welcome/lib/executr/lib/CodeMirror/codemirror.js:1239–1262

(cm)

  // events that indicate IME taking place, but these are not widely
  // supported or compatible enough yet to rely on.)
  function readInput(cm) {
    var input = cm.display.input, prevInput = cm.display.prevInput, view = cm.view, sel = view.sel;
    if (!view.focused || hasSelection(input) || isReadOnly(cm)) return false;
    var text = input.value;
    if (text == prevInput && posEq(sel.from, sel.to)) return false;
    startOperation(cm);
    view.sel.shift = false;
    var same = 0, l = Math.min(prevInput.length, text.length);
    while (same < l && prevInput[same] == text[same]) ++same;
    var from = sel.from, to = sel.to;
    if (same < prevInput.length)
      from = {line: from.line, ch: from.ch - (prevInput.length - same)};
    else if (view.overwrite && posEq(from, to) && !cm.display.pasteIncoming)
      to = {line: to.line, ch: Math.min(getLine(cm.view.doc, to.line).text.length, to.ch + (text.length - same))};
    var updateInput = cm.curOp.updateInput;
    updateDoc(cm, from, to, splitLines(text.slice(same)), "end",
              cm.display.pasteIncoming ? "paste" : "input", {from: from, to: to});
    cm.curOp.updateInput = updateInput;
    if (text.length > 1000) input.value = cm.display.prevInput = "";
    else cm.display.prevInput = text;
    endOperation(cm);
    cm.display.pasteIncoming = false;
    return true;
  }

  function resetInput(cm, user) {
    var view = cm.view, minimal, selected;