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/*
* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8188225 8204674
* @summary Check that variables of type var have a consistent model
* @modules jdk.compiler/com.sun.tools.javac.api
*/
import com.sun.source.tree.CompilationUnitTree;
import com.sun.tools.javac.api.JavacTaskImpl;
import java.io.IOException;
import java.net.URI;
import java.util.Arrays;
import java.util.List;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;
import com.sun.source.tree.VariableTree;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TreeScanner;
import com.sun.source.util.Trees;
public class VarTree {
private final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
public static void main(String... args) throws Exception {
VarTree test = new VarTree();
test.run("|var testVar = 0;| ",
"int testVar = 0");
test.run("|var testVar = 0;| undef undef;",
"int testVar = 0");
test.run("|final var testVar = 0;| ",
"final int testVar = 0");
test.run("for (|var testVar| : java.util.Arrays.asList(0, 1)) {}",
"java.lang.Integer testVar");
test.run("for (|final var testVar| : java.util.Arrays.asList(0, 1)) {}",
"final java.lang.Integer testVar");
test.run("java.util.function.Consumer<String> c = |testVar| -> {};",
"java.lang.String testVar");
test.run("java.util.function.Consumer<String> c = (|testVar|) -> {};",
"java.lang.String testVar");
test.run("java.util.function.Consumer<String> c = (|var testVar|) -> {};",
"java.lang.String testVar");
}
void run(String code, String expected) throws IOException {
String[] parts = code.split("\\|");
if (parts.length != 3) {
throw new IllegalStateException("Incorrect number of markers.");
}
String prefix = "public class Test { void test() { ";
String src = prefix + parts[0] + parts[1] + parts[2] + " } }";
JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, d -> {},
List.of("--should-stop=at=FLOW"),
null, Arrays.asList(new MyFileObject(src)));
Iterable<? extends CompilationUnitTree> units = ct.parse();
runSpanCheck(ct, units, src, prefix.length() + parts[0].length(), prefix.length() + parts[0].length() + parts[1].length());
ct.analyze();
runSpanCheck(ct, units, src, prefix.length() + parts[0].length(), prefix.length() + parts[0].length() + parts[1].length());
for (CompilationUnitTree cut : units) {
new TreeScanner<Void, Void>() {
@Override
public Void visitVariable(VariableTree node, Void p) {
if (node.getName().contentEquals("testVar")) {
if (!expected.equals(node.toString())) {
throw new AssertionError("Unexpected tree: " + node.toString());
}
}
if (String.valueOf(node.getType()).equals("testType")) {
if (!expected.equals(node.toString())) {
throw new AssertionError("Unexpected tree: " + node.toString());
}
}
return super.visitVariable(node, p);
}
}.scan(cut, null);
}
}
private void runSpanCheck(JavacTask ct, Iterable<? extends CompilationUnitTree> units, String src, int spanStart, int spanEnd) {
Trees trees = Trees.instance(ct);
boolean[] found = new boolean[1];
for (CompilationUnitTree cut : units) {
new TreeScanner<Void, Void>() {
@Override
public Void visitVariable(VariableTree node, Void p) {
if (node.getName().contentEquals("testVar")) {
int start = (int) trees.getSourcePositions().getStartPosition(cut, node);
int end = (int) trees.getSourcePositions().getEndPosition(cut, node);
String snip = src.substring(start, end);
if (start != spanStart || end != spanEnd) {
throw new AssertionError("Unexpected span: " + snip);
}
int typeStart = (int) trees.getSourcePositions().getStartPosition(cut, node.getType());
int typeEnd = (int) trees.getSourcePositions().getEndPosition(cut, node.getType());
if (typeStart != (-1) && typeEnd != (-1)) {
throw new AssertionError("Unexpected type position: " + typeStart + ", " + typeEnd);
}
found[0] = true;
}
if (String.valueOf(node.getType()).equals("testType")) {
int start = (int) trees.getSourcePositions().getStartPosition(cut, node);
int end = (int) trees.getSourcePositions().getEndPosition(cut, node);
String snip = src.substring(start, end);
if (start != spanStart || end != spanEnd) {
throw new AssertionError("Unexpected span: " + snip);
}
found[0] = true;
}
return super.visitVariable(node, p);
}
}.scan(cut, null);
}
if (!found[0]) {
throw new AssertionError("Didn't find the test variable.");
}
}
class MyFileObject extends SimpleJavaFileObject {
private String text;
public MyFileObject(String text) {
super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
this.text = text;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return text;
}
}
}
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