enterInsertMode: function()

in lib/ace/keyboard/vim.js [3164:3237]
72 lines of code
26 McCabe index (conditional complexity)

      enterInsertMode: function(cm, actionArgs, vim) {
        if (cm.getOption('readOnly')) { return; }
        vim.insertMode = true;
        vim.insertModeRepeat = actionArgs && actionArgs.repeat || 1;
        var insertAt = (actionArgs) ? actionArgs.insertAt : null;
        var sel = vim.sel;
        var head = actionArgs.head || cm.getCursor('head');
        var height = cm.listSelections().length;
        if (insertAt == 'eol') {
          head = Pos(head.line, lineLength(cm, head.line));
        } else if (insertAt == 'bol') {
          head = Pos(head.line, 0);
        } else if (insertAt == 'charAfter') {
          head = offsetCursor(head, 0, 1);
        } else if (insertAt == 'firstNonBlank') {
          head = motions.moveToFirstNonWhiteSpaceCharacter(cm, head);
        } else if (insertAt == 'startOfSelectedArea') {
          if (!vim.visualMode)
              return;
          if (!vim.visualBlock) {
            if (sel.head.line < sel.anchor.line) {
              head = sel.head;
            } else {
              head = Pos(sel.anchor.line, 0);
            }
          } else {
            head = Pos(
                Math.min(sel.head.line, sel.anchor.line),
                Math.min(sel.head.ch, sel.anchor.ch));
            height = Math.abs(sel.head.line - sel.anchor.line) + 1;
          }
        } else if (insertAt == 'endOfSelectedArea') {
            if (!vim.visualMode)
              return;
          if (!vim.visualBlock) {
            if (sel.head.line >= sel.anchor.line) {
              head = offsetCursor(sel.head, 0, 1);
            } else {
              head = Pos(sel.anchor.line, 0);
            }
          } else {
            head = Pos(
                Math.min(sel.head.line, sel.anchor.line),
                Math.max(sel.head.ch + 1, sel.anchor.ch));
            height = Math.abs(sel.head.line - sel.anchor.line) + 1;
          }
        } else if (insertAt == 'inplace') {
          if (vim.visualMode){
            return;
          }
        } else if (insertAt == 'lastEdit') {
          head = getLastEditPos(cm) || head;
        }
        cm.setOption('disableInput', false);
        if (actionArgs && actionArgs.replace) {
          // Handle Replace-mode as a special case of insert mode.
          cm.toggleOverwrite(true);
          cm.setOption('keyMap', 'vim-replace');
          CodeMirror.signal(cm, "vim-mode-change", {mode: "replace"});
        } else {
          cm.toggleOverwrite(false);
          cm.setOption('keyMap', 'vim-insert');
          CodeMirror.signal(cm, "vim-mode-change", {mode: "insert"});
        }
        if (!vimGlobalState.macroModeState.isPlaying) {
          // Only record if not replaying.
          cm.on('change', onChange);
          CodeMirror.on(cm.getInputField(), 'keydown', onKeyEventTargetKeyDown);
        }
        if (vim.visualMode) {
          exitVisualMode(cm);
        }
        selectForInsert(cm, head, height);
      },