我正在尝试使用public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the fragment to show based on nav item clicked
Fragment fragment = null;
Class fragmentClass;
switch(menuItem.getItemId()) {
case R.id.nav_first_fragment:
fragmentClass = FirstFragment.class;
getSupportFragmentManager().beginTransaction().replace(R.id.flContent, new FirstFragment()).commit();
break;
case R.id.nav_second_fragment:
fragmentClass = SecondFragment.class;
getSupportFragmentManager().beginTransaction().replace(R.id.flContent, new SecondFragment()).commit();
break;
case R.id.nav_third_fragment:
fragmentClass = ThirdFragment.class;
getSupportFragmentManager().beginTransaction().replace(R.id.flContent, new ThirdFragment()).commit();
break;
default:
fragmentClass = FirstFragment.class;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
// Highlight the selected item has been done by NavigationView
menuItem.setChecked(true);
// Set action bar title
setTitle(menuItem.getTitle());
// Close the navigation drawer
mDrawer.closeDrawers();
}
// ...
从Javascript片段生成AST：
@babel/parser...产生的结果：
const parse = require('@babel/parser').parse;
const fragment = 'if (x > 3) {';
const ast = parse(fragment, {
allowImportExportEverywhere: true,
allowAwaitOutsideFunction: true,
allowReturnOutsideFunction: true,
allowSuperOutsideMethod: true,
sourceType: 'unambiguous',
plugins: ['jsx'],
});
...或引发的异常。
是否可以强制解析器接受这些片段？还是可以使用babel解析替代方案来解决此问题？
我意识到生成的AST也将无效，但这与我的用例无关。