Function keyMapper

static/js/codemirror/keymap/vim.js:2523–2527

(key, modifier)

      // Closure to bind CodeMirror, key, modifier.
      function keyMapper(key, modifier) {
        return function(cm) {
          handleKeyEvent_(cm, key, modifier);
        };
      }

      var modifiers = ['Shift', 'Ctrl'];
      var keyMap = {