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/*
* Copyright 2008 The Closure Compiler Authors.
*
* 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.javascript.jscomp;
/**
* Tests for {@link AliasKeywords}.
*
*/
public class AliasKeywordsTest extends CompilerTestCase {
private static final int ENOUGH_TO_ALIAS_LITERAL
= AliasKeywords.MIN_OCCURRENCES_REQUIRED_TO_ALIAS_LITERAL;
private static final int TOO_FEW_TO_ALIAS_LITERAL
= ENOUGH_TO_ALIAS_LITERAL - 1;
private static final int ENOUGH_TO_ALIAS_THROW
= AliasKeywords.MIN_OCCURRENCES_REQUIRED_TO_ALIAS_THROW;
private static final int TOO_FEW_TO_ALIAS_THROW
= ENOUGH_TO_ALIAS_THROW - 1;
@Override
public void setUp() {
super.enableLineNumberCheck(false);
super.enableNormalize();
}
@Override
public CompilerPass getProcessor(Compiler compiler) {
return new AliasKeywords(compiler);
}
@Override
protected int getNumRepetitions() {
return 1;
}
/**
* Generate code of the form 'if (<keyword>);' repeated numReps
* times, with prepend prepended.
*
* For example, generateCode("true", 2, "var a=b;") generates
* <code>var a=b;if (true);if (true);</code>
*/
private static String generateCode(
String keyword, int numReps, String prepend) {
StringBuilder sb = new StringBuilder(prepend);
for (int i = 0; i < numReps; i++) {
sb.append("if (");
sb.append(keyword);
sb.append(");");
}
return sb.toString();
}
private static String generateCode(String keyword, int numReps) {
return generateCode(keyword, numReps, "");
}
private static String generatePreProcessThrowCode(int repititions,
String whatToThrow) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < repititions; i++) {
sb.append("throw ");
sb.append(whatToThrow);
sb.append(";");
}
return sb.toString();
}
private static String generatePostProcessThrowCode(
int repetitions, String code, String whatToThrow) {
StringBuilder sb = new StringBuilder();
sb.append("function ");
sb.append(AliasKeywords.ALIAS_THROW);
sb.append("(jscomp_throw_param){throw jscomp_throw_param;}");
sb.append(code);
for (int i = 0; i < repetitions; i++) {
sb.append(AliasKeywords.ALIAS_THROW);
sb.append("(");
sb.append(whatToThrow);
sb.append(");");
}
return sb.toString();
}
/**
* Don't generate aliases if the keyword is not referenced enough.
*/
public void testDontAlias() {
testSame(generateCode("true", TOO_FEW_TO_ALIAS_LITERAL));
testSame(generateCode("false", TOO_FEW_TO_ALIAS_LITERAL));
testSame(generateCode("null", TOO_FEW_TO_ALIAS_LITERAL));
testSame(generateCode("void 0", TOO_FEW_TO_ALIAS_LITERAL));
testSame(generatePreProcessThrowCode(TOO_FEW_TO_ALIAS_THROW, "1"));
// Don't alias void nodes other than "void 0".
testSame(generateCode("void 1", ENOUGH_TO_ALIAS_LITERAL));
testSame(generateCode("void x", ENOUGH_TO_ALIAS_LITERAL));
testSame(generateCode("void f()", ENOUGH_TO_ALIAS_LITERAL));
}
/**
* Generate aliases if the keyword is referenced >= ENOUGH_TO_ALIAS
* times.
*/
public void testAlias() {
test(generateCode("true", ENOUGH_TO_ALIAS_LITERAL),
generateCode(AliasKeywords.ALIAS_TRUE, ENOUGH_TO_ALIAS_LITERAL,
"var JSCompiler_alias_TRUE=true;"));
test(generateCode("false", ENOUGH_TO_ALIAS_LITERAL),
generateCode(AliasKeywords.ALIAS_FALSE, ENOUGH_TO_ALIAS_LITERAL,
"var JSCompiler_alias_FALSE=false;"));
test(generateCode("null", ENOUGH_TO_ALIAS_LITERAL),
generateCode(AliasKeywords.ALIAS_NULL, ENOUGH_TO_ALIAS_LITERAL,
"var JSCompiler_alias_NULL=null;"));
test(generateCode("void 0", ENOUGH_TO_ALIAS_LITERAL),
generateCode(AliasKeywords.ALIAS_VOID, ENOUGH_TO_ALIAS_LITERAL,
"var JSCompiler_alias_VOID=void 0;"));
test(generatePreProcessThrowCode(ENOUGH_TO_ALIAS_THROW, "1"),
generatePostProcessThrowCode(ENOUGH_TO_ALIAS_THROW, "", "1"));
}
public void testAliasTrueFalseNull() {
StringBuilder actual = new StringBuilder();
actual.append(generateCode("true", ENOUGH_TO_ALIAS_LITERAL));
actual.append(generateCode("false", ENOUGH_TO_ALIAS_LITERAL));
actual.append(generateCode("null", ENOUGH_TO_ALIAS_LITERAL));
actual.append(generateCode("void 0", ENOUGH_TO_ALIAS_LITERAL));
StringBuilder expected = new StringBuilder();
expected.append(
"var JSCompiler_alias_VOID=void 0;" +
"var JSCompiler_alias_TRUE=true;" +
"var JSCompiler_alias_NULL=null;" +
"var JSCompiler_alias_FALSE=false;");
expected.append(
generateCode(AliasKeywords.ALIAS_TRUE, ENOUGH_TO_ALIAS_LITERAL));
expected.append(
generateCode(AliasKeywords.ALIAS_FALSE, ENOUGH_TO_ALIAS_LITERAL));
expected.append(
generateCode(AliasKeywords.ALIAS_NULL, ENOUGH_TO_ALIAS_LITERAL));
expected.append(
generateCode(AliasKeywords.ALIAS_VOID, ENOUGH_TO_ALIAS_LITERAL));
test(actual.toString(), expected.toString());
}
public void testAliasThrowKeywordLiteral() {
int repitions = Math.max(ENOUGH_TO_ALIAS_THROW, ENOUGH_TO_ALIAS_LITERAL);
String afterCode = generatePostProcessThrowCode(
repitions, "var JSCompiler_alias_TRUE=true;",
AliasKeywords.ALIAS_TRUE);
test(generatePreProcessThrowCode(repitions, "true"), afterCode);
}
public void testExistingAliasDefinitionFails() {
try {
testSame("var JSCompiler_alias_TRUE='foo';");
fail();
} catch (RuntimeException expected) {
// expected exception
assertTrue(-1 != expected.getMessage().indexOf(
"Existing alias definition"));
}
}
public void testWithNoInputs() {
testSame(new String[] {});
}
}
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