MnemonicChecker.java

package jetbrains.mps.lang.plugin.typesystem;

/*Generated by MPS */

import org.jetbrains.annotations.Nullable;

public class MnemonicChecker {
  @Nullable
  public static String check(String caption, String character) {
    assert character.length() == 1;
    if (!(Character.isLetter(character.charAt(0))) || caption.indexOf(character) == -1) {
      return "mnemonic should be a letter contained in caption";
    }
    return null;
  }
}