Function compositionMode

node/input_methods/emojime/src/reducer/compositionMode.js:7–127

(request, preState)

let KEYCODE  = require('nime/lib/keyCodes');

function compositionMode(request, preState) {

  let {keyCode, charCode} = request;

  let {
    compositionString,
    compositionCursor,
    showCandidates
  } = preState;

  // ':' + space would fast input ': ' for typing
  if (keyCode == KEYCODE.VK_SPACE && compositionString == ':') {
    return Object.assign({}, preState, {
      action: 'COMMIT_STRING',
      compositionString: '',
      compositionCursor: 0,
      commitString: ': '
    });
  }

  // Show candidate list
  if (keyCode === KEYCODE.VK_DOWN) {

    // Must larger ':'.length
    if (compositionString.length > 1) {

      let candidateList = [];

      emojione.mapEmojioneList((unicode, shortname) => {
        if (shortname.indexOf(compositionString.slice(1)) >= 0 && candidateList.length < 9) {
          candidateList.push(`${emojione.convert(unicode)} ${shortname}`);
        }
      });

      if (candidateList.length > 0) {
        return Object.assign({}, preState, {
          action: 'SHOW_CANDIDATES',
          showCandidates: true,
          candidateList
        });
      }
    }
  }

  // Move cursor left
  if (keyCode === KEYCODE.VK_LEFT) {
    if (compositionCursor > 0) {
      return Object.assign({}, preState, {
        action: 'UPDATE_STRING',
        compositionCursor: compositionCursor - 1
      });
    }
    return Object.assign({}, preState, {action: ''});
  }

  // Move cursor right
  if (keyCode === KEYCODE.VK_RIGHT) {
    if (compositionCursor < compositionString.length) {