/*
* Copyright 2009 the original author or 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 org.gradle.groovy.scripts.internal;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.ImportNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.ModuleNode;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.control.CompilationFailedException;
import org.codehaus.groovy.control.Phases;
import org.codehaus.groovy.control.SourceUnit;
import org.gradle.api.specs.Spec;
import org.gradle.api.specs.Specs;
import org.gradle.groovy.scripts.Transformer;
import org.gradle.internal.UncheckedException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
/**
* Excludes everything from a script except statements that are satisfied by a given predicate, and imports for accessible classes. <p> *All* other kinds of constructs are filtered, including:
* classes, methods etc.
*/
public class StatementExtractingScriptTransformer extends AbstractScriptTransformer {
private final String id;
private final StatementTransformer transformer;
public StatementExtractingScriptTransformer(String id, StatementTransformer transformer) {
this.id = id;
this.transformer = transformer;
}
public String getId() {
return id;
}
protected int getPhase() {
return Phases.CONVERSION;
}
public void call(SourceUnit source) throws CompilationFailedException {
AstUtils.filterAndTransformStatements(source, transformer);
// Filter imported classes which are not available yet
Iterator<ImportNode> iter = source.getAST().getImports().iterator();
while (iter.hasNext()) {
ImportNode importedClass = iter.next();
if (!AstUtils.isVisible(source, importedClass.getClassName())) {
try {
Field field = ModuleNode.class.getDeclaredField("imports");
field.setAccessible(true);
Map value = (Map) field.get(source.getAST());
value.remove(importedClass.getAlias());
} catch (Exception e) {
throw UncheckedException.throwAsUncheckedException(e);
}
}
}
iter = source.getAST().getStaticImports().values().iterator();
while (iter.hasNext()) {
ImportNode importedClass = iter.next();
if (!AstUtils.isVisible(source, importedClass.getClassName())) {
iter.remove();
}
}
iter = source.getAST().getStaticStarImports().values().iterator();
while (iter.hasNext()) {
ImportNode importedClass = iter.next();
if (!AstUtils.isVisible(source, importedClass.getClassName())) {
iter.remove();
}
}
ClassNode scriptClass = AstUtils.getScriptClass(source);
// Remove all the classes other than the main class
Iterator<ClassNode> classes = source.getAST().getClasses().iterator();
while (classes.hasNext()) {
ClassNode classNode = classes.next();
if (classNode != scriptClass) {
classes.remove();
}
}
// Remove all the methods from the main class
if (scriptClass != null) {
for (MethodNode methodNode : new ArrayList<MethodNode>(scriptClass.getMethods())) {
if (!methodNode.getName().equals("run")) {
AstUtils.removeMethod(scriptClass, methodNode);
}
}
}
source.getAST().getMethods().clear();
}
public Transformer invert() {
return new Inverse("no_" + StatementExtractingScriptTransformer.this.getId(), Specs.not(transformer.getSpec()));
}
private static class Inverse extends AbstractScriptTransformer {
private final String id;
private final Spec<? super Statement> spec;
private Inverse(String id, Spec<? super Statement> spec) {
this.id = id;
this.spec = spec;
}
protected int getPhase() {
return Phases.CANONICALIZATION;
}
public String getId() {
return id;
}
@Override
public void call(SourceUnit source) throws CompilationFailedException {
AstUtils.filterAndTransformStatements(source, new FilteringStatementTransformer(spec));
}
}
}