package org.apache.velocity.test;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import org.apache.velocity.test.BaseTestCase;
import org.apache.velocity.runtime.parser.node.ASTStringLiteral;

/**
 * Test Case for <a href="https://issues.apache.org/jira/browse/VELTOOLS-520">Velocity Tools Issue 520</a>.
 */
public class UnicodeEscapeTestCase extends BaseTestCase
{
    public UnicodeEscapeTestCase(final String name) throws Exception
    {
        super(name);
    }

    public void testUnicodeEscape() throws Exception
    {
        assertEvalEquals("a", "#set($v = \"\\u0061\")$v");
    }

    private void assertUnescape(String expected, String escaped)
    {
        String unescaped = ASTStringLiteral.unescape(escaped);
        assertEquals(expected, unescaped);
        if (escaped.equals(expected))
        {
            // checking that no new string allocated, for perfomance
            assertSame(unescaped, escaped);
        }
    }

    public void testASTStringLiteralUnescape()
    {
        assertUnescape("", "");
        assertUnescape("bebe", "bebe");
        assertUnescape("as\\nsd", "as\\nsd");
        assertUnescape("a", "\\u0061");
        assertUnescape("abc", "\\u0061bc");
        assertUnescape("\u0061bc\u0064", "\\u0061bc\\u0064");
        assertUnescape("z\u0061bc\u0064f", "z\\u0061bc\\u0064f");
    }

}
