/*
* Copyright 2010 Google Inc.
*
* 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 com.google.gwt.dev.js;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.ConfigurationProperty;
import com.google.gwt.core.ext.DefaultSelectionProperty;
import com.google.gwt.core.ext.PropertyOracle;
import com.google.gwt.core.ext.SelectionProperty;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.dev.jjs.SourceOrigin;
import com.google.gwt.dev.js.ast.JsProgram;
import com.google.gwt.dev.js.ast.JsStatement;
import com.google.gwt.dev.js.ast.JsVisitor;
import com.google.gwt.dev.shell.FailErrorLogger;
import com.google.gwt.dev.util.DefaultTextOutput;
import com.google.gwt.dev.util.TextOutput;
import junit.framework.TestCase;
import java.io.StringReader;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* Test for {@link JsCoerceIntShift}.
*/
public class JsCoerceIntShiftTest extends TestCase {
/**
* Oracle that mocks the user.agent property.
*/
private static class MockOracle implements PropertyOracle {
private static SelectionProperty createSelectionProperty(String value) {
if (value == null) {
return null;
} else {
SortedSet<String> valueSet = new TreeSet<String>();
valueSet.add(value);
return new DefaultSelectionProperty(value, value, value, valueSet,
null /* fallbackValueMap */);
}
}
private final SelectionProperty userAgent;
/**
* @param userAgentName value of user.agent property, if null then the
* user.agent property is treated as if it doesn't exist.
*/
public MockOracle(String userAgentName) {
userAgent = createSelectionProperty(userAgentName);
}
@Override
public ConfigurationProperty getConfigurationProperty(String propertyName)
throws BadPropertyValueException {
throw new BadPropertyValueException("no config properties");
}
@Override
public SelectionProperty getSelectionProperty(TreeLogger logger,
String propertyName) throws BadPropertyValueException {
if (userAgent != null && "user.agent".equals(propertyName)) {
return userAgent;
}
throw new BadPropertyValueException("no property " + propertyName);
}
}
private PropertyOracle safariOracle = new MockOracle("safari");
private PropertyOracle firefoxOracle = new MockOracle("gecko1_8");
private PropertyOracle noAgentOracle = new MockOracle(null);
private TreeLogger logger = new FailErrorLogger();
public void testNonSafari() throws Exception {
assertNotRewritten(firefoxOracle);
}
public void testNoUserAgent() throws Exception {
assertRewritten(noAgentOracle);
assertRewritten(firefoxOracle, noAgentOracle);
}
public void testSafari() throws Exception {
assertRewritten(safariOracle);
assertRewritten(firefoxOracle, safariOracle);
}
/**
* Assert that the provided PropertyOracles do not cause a rewrite of
* right-shift operations.
*
* @param oracles
* @throws Exception
*/
private void assertNotRewritten(PropertyOracle... oracles) throws Exception {
assertEquals("a<<b;", process("a<<b;", oracles));
assertEquals("a>>b;", process("a>>b;", oracles));
assertEquals("a>>>b;", process("a>>>b;", oracles));
assertEquals("1+1>>2;", process("1+1>>2;", oracles));
}
/**
* Assert that the provided PropertyOracles do cause a rewrite of right-shift
* operations.
*
* @param oracles
* @throws Exception
*/
private void assertRewritten(PropertyOracle... oracles) throws Exception {
assertEquals("a<<b;", process("a<<b;", oracles));
assertEquals("~~a>>b;", process("a>>b;", oracles));
assertEquals("~~a>>>b;", process("a>>>b;", oracles));
assertEquals("~~(1+1)>>2;", process("1+1>>2;", oracles));
}
/**
* Process a JS program with the {@link JsCoerceIntShift} pass.
*
* @param js the source program
* @param oracles
* @return processed JS
*/
private String process(String js, PropertyOracle[] oracles)
throws Exception {
JsProgram program = new JsProgram();
List<JsStatement> expected = JsParser.parse(SourceOrigin.UNKNOWN,
program.getScope(), new StringReader(js));
program.getGlobalBlock().getStatements().addAll(expected);
JsCoerceIntShift.exec(program, logger, oracles);
TextOutput text = new DefaultTextOutput(true);
JsVisitor generator = new JsSourceGenerationVisitor(text);
generator.accept(program);
return text.toString();
}
}