Function selectBlock

src/codemirror.js:12108–12144

(cm, selectionEnd)

    // Width of the block:
    // Distance between selectionEnd.ch and any(first considered here) selection.ch
    function selectBlock(cm, selectionEnd) {
      var selections = [], ranges = cm.listSelections();
      var head = copyCursor(cm.clipPos(selectionEnd));
      var isClipped = !cursorEqual(selectionEnd, head);
      var curHead = cm.getCursor('head');
      var primIndex = getIndex(ranges, curHead);
      var wasClipped = cursorEqual(ranges[primIndex].head, ranges[primIndex].anchor);
      var max = ranges.length - 1;
      var index = max - primIndex > primIndex ? max : 0;
      var base = ranges[index].anchor;

      var firstLine = Math.min(base.line, head.line);
      var lastLine = Math.max(base.line, head.line);
      var baseCh = base.ch, headCh = head.ch;

      var dir = ranges[index].head.ch - baseCh;
      var newDir = headCh - baseCh;
      if (dir > 0 && newDir <= 0) {
        baseCh++;
        if (!isClipped) { headCh--; }
      } else if (dir < 0 && newDir >= 0) {
        baseCh--;
        if (!wasClipped) { headCh++; }
      } else if (dir < 0 && newDir == -1) {
        baseCh--;
        headCh++;
      }
      for (var line = firstLine; line <= lastLine; line++) {
        var range = {anchor: new Pos(line, baseCh), head: new Pos(line, headCh)};
        selections.push(range);
      }
      primIndex = head.line == lastLine ? selections.length - 1 : 0;
      cm.setSelections(selections);
      selectionEnd.ch = headCh;
      base.ch = baseCh;
      return base;
    }
    function selectForInsert(cm, head, height) {
      var sel = [];
      for (var i = 0; i < height; i++) {