/*
* 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.
*/
package org.apache.el;
import java.io.File;
import java.lang.reflect.Method;
import java.util.Date;
import javax.el.ELException;
import javax.el.FunctionMapper;
import javax.el.ValueExpression;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import org.junit.Test;
import org.apache.el.lang.ELSupport;
import org.apache.jasper.el.ELContextImpl;
/**
* Tests the EL engine directly. Similar tests may be found in
* {@link org.apache.jasper.compiler.TestAttributeParser} and
* {@link TestELInJsp}.
*/
public class TestELEvaluation {
/**
* Test use of spaces in ternary expressions. This was primarily an EL
* parser bug.
*/
@Test
public void testBug42565() {
assertEquals("false", evaluateExpression("${false?true:false}"));
assertEquals("false", evaluateExpression("${false?true: false}"));
assertEquals("false", evaluateExpression("${false?true :false}"));
assertEquals("false", evaluateExpression("${false?true : false}"));
assertEquals("false", evaluateExpression("${false? true:false}"));
assertEquals("false", evaluateExpression("${false? true: false}"));
assertEquals("false", evaluateExpression("${false? true :false}"));
assertEquals("false", evaluateExpression("${false? true : false}"));
assertEquals("false", evaluateExpression("${false ?true:false}"));
assertEquals("false", evaluateExpression("${false ?true: false}"));
assertEquals("false", evaluateExpression("${false ?true :false}"));
assertEquals("false", evaluateExpression("${false ?true : false}"));
assertEquals("false", evaluateExpression("${false ? true:false}"));
assertEquals("false", evaluateExpression("${false ? true: false}"));
assertEquals("false", evaluateExpression("${false ? true :false}"));
assertEquals("false", evaluateExpression("${false ? true : false}"));
}
/**
* Test use nested ternary expressions. This was primarily an EL parser bug.
*/
@Test
public void testBug44994() {
assertEquals("none", evaluateExpression(
"${0 lt 0 ? 1 lt 0 ? 'many': 'one': 'none'}"));
assertEquals("one", evaluateExpression(
"${0 lt 1 ? 1 lt 1 ? 'many': 'one': 'none'}"));
assertEquals("many", evaluateExpression(
"${0 lt 2 ? 1 lt 2 ? 'many': 'one': 'none'}"));
}
@Test
public void testParserBug45511() {
// Test cases provided by OP
assertEquals("true", evaluateExpression("${empty ('')}"));
assertEquals("true", evaluateExpression("${empty('')}"));
assertEquals("false", evaluateExpression("${(true) and (false)}"));
assertEquals("false", evaluateExpression("${(true)and(false)}"));
}
@Test
public void testBug48112() {
// bug 48112
assertEquals("{world}", evaluateExpression("${fn:trim('{world}')}"));
}
@Test
public void testParserLiteralExpression() {
// Inspired by work on bug 45451, comments from kkolinko on the dev
// list and looking at the spec to find some edge cases
// '\' is only an escape character inside a StringLiteral
assertEquals("\\\\", evaluateExpression("\\\\"));
/*
* LiteralExpresions can only contain ${ or #{ if escaped with \
* \ is not an escape character in any other circumstances including \\
*/
assertEquals("\\", evaluateExpression("\\"));
assertEquals("$", evaluateExpression("$"));
assertEquals("#", evaluateExpression("#"));
assertEquals("\\$", evaluateExpression("\\$"));
assertEquals("\\#", evaluateExpression("\\#"));
assertEquals("\\\\$", evaluateExpression("\\\\$"));
assertEquals("\\\\#", evaluateExpression("\\\\#"));
assertEquals("${", evaluateExpression("\\${"));
assertEquals("#{", evaluateExpression("\\#{"));
assertEquals("\\${", evaluateExpression("\\\\${"));
assertEquals("\\#{", evaluateExpression("\\\\#{"));
}
@Test
public void testParserStringLiteral() {
// Inspired by work on bug 45451, comments from kkolinko on the dev
// list and looking at the spec to find some edge cases
// The only characters that can be escaped inside a String literal
// are \ " and '. # and $ are not escaped inside a String literal.
assertEquals("\\", evaluateExpression("${'\\\\'}"));
assertEquals("\\", evaluateExpression("${\"\\\\\"}"));
assertEquals("\\\"'$#", evaluateExpression("${'\\\\\\\"\\'$#'}"));
assertEquals("\\\"'$#", evaluateExpression("${\"\\\\\\\"\\'$#\"}"));
// Trying to quote # or $ should throw an error
Exception e = null;
try {
evaluateExpression("${'\\$'}");
} catch (ELException el) {
e = el;
}
assertNotNull(e);
assertEquals("\\$", evaluateExpression("${'\\\\$'}"));
assertEquals("\\\\$", evaluateExpression("${'\\\\\\\\$'}"));
// Can use ''' inside '"' when quoting with '"' and vice versa without
// escaping
assertEquals("\\\"", evaluateExpression("${'\\\\\"'}"));
assertEquals("\"\\", evaluateExpression("${'\"\\\\'}"));
assertEquals("\\'", evaluateExpression("${'\\\\\\''}"));
assertEquals("'\\", evaluateExpression("${'\\'\\\\'}"));
assertEquals("\\'", evaluateExpression("${\"\\\\'\"}"));
assertEquals("'\\", evaluateExpression("${\"'\\\\\"}"));
assertEquals("\\\"", evaluateExpression("${\"\\\\\\\"\"}"));
assertEquals("\"\\", evaluateExpression("${\"\\\"\\\\\"}"));
}
private void compareBoth(String msg, int expected, Object o1, Object o2){
int i1 = ELSupport.compare(o1, o2);
int i2 = ELSupport.compare(o2, o1);
assertEquals(msg,expected, i1);
assertEquals(msg,expected, -i2);
}
@Test
public void testElSupportCompare(){
compareBoth("Nulls should compare equal", 0, null, null);
compareBoth("Null should compare equal to \"\"", 0, "", null);
compareBoth("Null should be less than File()",-1, null, new File(""));
compareBoth("Null should be less than Date()",-1, null, new Date());
compareBoth("Date(0) should be less than Date(1)",-1, new Date(0), new Date(1));
try {
compareBoth("Should not compare",0, new Date(), new File(""));
fail("Expecting ClassCastException");
} catch (ClassCastException expected) {
// Expected
}
assertTrue(null == null);
}
/**
* Test mixing ${...} and #{...} in the same expression.
*/
@Test
public void testMixedTypes() {
// Mixing types should throw an error
Exception e = null;
try {
evaluateExpression("${1+1}#{1+1}");
} catch (ELException el) {
e = el;
}
assertNotNull(e);
}
// ************************************************************************
private String evaluateExpression(String expression) {
ELContextImpl ctx = new ELContextImpl();
ctx.setFunctionMapper(new FMapper());
ExpressionFactoryImpl exprFactory = new ExpressionFactoryImpl();
ValueExpression ve = exprFactory.createValueExpression(ctx, expression,
String.class);
return (String) ve.getValue(ctx);
}
public static class FMapper extends FunctionMapper {
@Override
public Method resolveFunction(String prefix, String localName) {
if ("trim".equals(localName)) {
Method m;
try {
m = TesterFunctions.class.getMethod("trim", String.class);
return m;
} catch (SecurityException e) {
// Ignore
} catch (NoSuchMethodException e) {
// Ignore
}
}
return null;
}
}
}