Function buildVimKeyMap

static/js/codemirror/keymap/vim.js:2497–2559

()

    // Register Vim with CodeMirror
    function buildVimKeyMap() {
      /**
       * Handle the raw key event from CodeMirror. Translate the
       * Shift + key modifier to the resulting letter, while preserving other
       * modifers.
       */
      // TODO: Figure out a way to catch capslock.
      function handleKeyEvent_(cm, key, modifier) {
        if (isUpperCase(key)) {
          // Convert to lower case if shift is not the modifier since the key
          // we get from CodeMirror is always upper case.
          if (modifier == 'Shift') {
            modifier = null;
          }
          else {
            key = key.toLowerCase();
          }
        }
        if (modifier) {
          // Vim will parse modifier+key combination as a single key.
          key = modifier + '-' + key;
        }
        vim.handleKey(cm, key);
      }

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

      var modifiers = ['Shift', 'Ctrl'];
      var keyMap = {
        'nofallthrough': true,
        'style': 'fat-cursor'
      };
      function bindKeys(keys, modifier) {
        for (var i = 0; i < keys.length; i++) {
          var key = keys[i];
          if (!modifier && inArray(key, specialSymbols)) {
            // Wrap special symbols with '' because that's how CodeMirror binds
            // them.
            key = "'" + key + "'";
          }
          if (modifier) {
            keyMap[modifier + '-' + key] = keyMapper(keys[i], modifier);
          } else {
            keyMap[key] = keyMapper(keys[i]);
          }
        }
      }
      bindKeys(upperCaseAlphabet);
      bindKeys(upperCaseAlphabet, 'Shift');
      bindKeys(upperCaseAlphabet, 'Ctrl');
      bindKeys(specialSymbols);
      bindKeys(specialSymbols, 'Ctrl');
      bindKeys(numbers);