IntelliJ13.java

/*
 * Copyright 2011-present Greg Shrago
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.intellij.grammar;

import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.Nullable;

import java.util.regex.Pattern;

/**
 * @author gregsh
 */
public class IntelliJ13 {
  @Contract("_, !null->!null")
  public static Pattern compileSafe(String pattern, Pattern def) {
    try {
      return Pattern.compile(pattern);
    }
    catch (Exception e) {
      return def;
    }
  }

  @Contract(value = "null -> null; !null -> !null", pure = true)
  public static String trim(@Nullable String s) {
    return s == null ? null : s.trim();
  }

  @Contract("null -> null;!null -> !null")
  public static IElementType getElementType(@Nullable ASTNode node) {
    return node == null ? null : node.getElementType();
  }

  @Contract("null -> null;!null -> !null")
  public static IElementType getElementType(@Nullable PsiElement element) {
    return element == null ? null : getElementType(element.getNode());
  }
}