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RecoverableJsAstTest.java
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RecoverableJsAstTest.java
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/*
* Copyright 2010 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;
import static com.google.common.truth.Truth.assertThat;
import static com.google.javascript.rhino.testing.NodeSubject.assertNode;
import com.google.common.collect.ImmutableList;
import com.google.common.truth.Correspondence;
import com.google.javascript.jscomp.SourceFile.Generator;
import com.google.javascript.rhino.Node;
import java.util.List;
import java.util.Objects;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Unit tests for {@link RecoverableJsAst}.
*
*/
@RunWith(JUnit4.class)
public class RecoverableJsAstTest {
private String srcCode = "";
@Test
public void testSimple() {
setSourceCode("var a;");
SourceAst realAst = createRealAst();
// Note that here we do not test the caching of the tree between calls,
// since that is the responsibility of the JsAst class. Here we just test
// that proxying is successful and a copy is happening
// Initial compile.
RecoverableJsAst ast1 = new RecoverableJsAst(realAst, true);
checkCompile(realAst, makeDefensiveCopy(ast1), "var a;\n");
// Change in the file-system.
setSourceCode("var b;");
realAst.clearAst();
// The first RecoverableJsAst should continue to have the same value.
checkCompile(realAst, makeDefensiveCopy(ast1), "var a;\n");
// A newly created one from the source should have a different value.
RecoverableJsAst ast2 = new RecoverableJsAst(realAst, true);
checkCompile(realAst, makeDefensiveCopy(ast2), "var b;\n");
// Clearing the first AST should also pick up the new changes.
ast1.clearAst();
checkCompile(realAst, makeDefensiveCopy(ast1), "var b;\n");
}
@Test
public void testWarningReplay() {
setSourceCode("var f() = a;");
SourceAst realAst = createRealAst();
// Note that here we do not test the caching of the tree between calls,
// since that is the responsibility of the JsAst class. Here we just test
// that proxying is successful and a copy is happening
// Initial compile.
RecoverableJsAst ast1 = new RecoverableJsAst(realAst, true);
checkParseErrors(realAst, makeDefensiveCopy(ast1), "Parse error. Semi-colon expected");
// The first RecoverableJsAst should continue to have the same value.
checkParseErrors(realAst, makeDefensiveCopy(ast1), "Parse error. Semi-colon expected");
}
private RecoverableJsAst makeDefensiveCopy(SourceAst ast) {
// NOTE: We reuse RecoverableJsAst as a way of making tree clones, because
// compilation mutates the tree. This is unrelated to testing
// RecoverableJsAst.
return new RecoverableJsAst(ast, true);
}
private String getSourceCode() {
return srcCode;
}
private void setSourceCode(String code) {
srcCode = code;
}
private SourceAst createRealAst() {
SourceFile file = SourceFile.fromGenerator("tests.js", new Generator() {
@Override
public String getCode() {
return getSourceCode();
}
});
return new JsAst(file);
}
private static CompilerOptions createCompilerOptions() {
CompilerOptions options = new CompilerOptions();
options.setPrettyPrint(true);
return options;
}
private void checkParseErrors(SourceAst realAst, RecoverableJsAst ast, String... expectedErrors) {
checkCompile(realAst, ast, null, ImmutableList.copyOf(expectedErrors));
}
private void checkCompile(SourceAst realAst, RecoverableJsAst ast, String expected) {
checkCompile(realAst, ast, expected, ImmutableList.<String>of());
}
private void checkCompile(SourceAst realAst, RecoverableJsAst ast, String expected,
ImmutableList<String> expectedErrors) {
Compiler compiler = new Compiler();
// Keep this a "small" test. Don't use threads.
compiler.disableThreads();
JSModule module = new JSModule("m0");
module.add(new CompilerInput(ast));
compiler.compileModules(ImmutableList.<SourceFile>of(),
ImmutableList.of(module),
createCompilerOptions());
Node mainRoot = compiler.getRoot().getLastChild();
Node expectedRoot = null;
if (expected != null) {
expectedRoot = parseExpectedJs(ImmutableList.of(
SourceFile.fromCode("expected.js", expected)));
expectedRoot.detach();
}
if (expectedRoot == null) {
// We use null to signal a parse failure, which results in an empty sources root.
assertThat(mainRoot.isRoot()).isTrue();
assertThat(mainRoot.hasChildren()).isFalse();
} else {
assertNode(mainRoot)
.usingSerializer(compiler::toSource)
.isEqualIncludingJsDocTo(expectedRoot);
}
assertThat(compiler.getResult().errors)
.comparingElementsUsing(DESCRIPTION_EQUALITY)
.containsExactlyElementsIn(expectedErrors)
.inOrder();
assertThat(ast.getAstRoot(compiler)).isNotSameInstanceAs(realAst.getAstRoot(compiler));
}
/**
* Parses expected JS inputs and returns the root of the parse tree.
*/
protected Node parseExpectedJs(List<SourceFile> inputs) {
Compiler compiler = new Compiler();
compiler.init(ImmutableList.<SourceFile>of(), inputs, createCompilerOptions());
compiler.parse();
Node root = compiler.getRoot();
assertThat(root).isNotNull();
Node externsRoot = root.getFirstChild();
Node mainRoot = externsRoot.getNext();
return mainRoot;
}
private static final Correspondence<JSError, String> DESCRIPTION_EQUALITY =
Correspondence.from(
(error, description) -> Objects.equals(error.description, description),
"has description equal to");
}