/*
* 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.api.internal.artifacts.dsl;
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.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.ClosureExpression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
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.util.UncheckedException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
/**
* The classpath script transformer uses Groovy's AST support to implement a two-phase
* compilation of a script into a "class path script" and an "everything else script".
* The classpath script can then be executed and it's results taken into account (in
* particular, to update the classpath) before the remainder of the script is executed.
*/
public abstract class ClasspathScriptTransformer extends AbstractScriptTransformer {
protected abstract String getScriptMethodName();
protected int getPhase() {
return Phases.CONVERSION;
}
public void call(SourceUnit source) throws CompilationFailedException {
Spec<Statement> spec = isScriptBlock();
filterStatements(source, spec);
// Filter imported classes which are not available yet
Iterator<ImportNode> iter = source.getAST().getImports().iterator();
while (iter.hasNext()) {
ImportNode importedClass = iter.next();
if (!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.asUncheckedException(e);
}
}
}
iter = source.getAST().getStaticImports().values().iterator();
while (iter.hasNext()) {
ImportNode importedClass = iter.next();
if (!isVisible(source, importedClass.getClassName())) {
iter.remove();
}
}
iter = source.getAST().getStaticStarImports().values().iterator();
while (iter.hasNext()) {
ImportNode importedClass = iter.next();
if (!isVisible(source, importedClass.getClassName())) {
iter.remove();
}
}
ClassNode scriptClass = 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")) {
removeMethod(scriptClass, methodNode);
}
}
}
source.getAST().getMethods().clear();
}
private boolean isVisible(SourceUnit source, String className) {
try {
source.getClassLoader().loadClass(className);
return true;
} catch (ClassNotFoundException e) {
return false;
}
}
private void filterStatements(SourceUnit source, Spec<Statement> spec) {
Iterator statementIterator = source.getAST().getStatementBlock().getStatements().iterator();
while (statementIterator.hasNext()) {
Statement statement = (Statement) statementIterator.next();
if (!spec.isSatisfiedBy(statement)) {
statementIterator.remove();
}
}
}
public Transformer invert() {
return new AbstractScriptTransformer() {
protected int getPhase() {
return Phases.CANONICALIZATION;
}
public String getId() {
return "no_" + ClasspathScriptTransformer.this.getId();
}
@Override
public void call(SourceUnit source) throws CompilationFailedException {
Spec<Statement> spec = Specs.not(isScriptBlock());
filterStatements(source, spec);
}
};
}
public Spec<Statement> isScriptBlock() {
return new Spec<Statement>() {
public boolean isSatisfiedBy(Statement statement) {
if (!(statement instanceof ExpressionStatement)) {
return false;
}
ExpressionStatement expressionStatement = (ExpressionStatement) statement;
if (!(expressionStatement.getExpression() instanceof MethodCallExpression)) {
return false;
}
MethodCallExpression methodCall = (MethodCallExpression) expressionStatement.getExpression();
if (!isMethodOnThis(methodCall, getScriptMethodName())) {
return false;
}
if (!(methodCall.getArguments() instanceof ArgumentListExpression)) {
return false;
}
ArgumentListExpression args = (ArgumentListExpression) methodCall.getArguments();
return args.getExpressions().size() == 1 && args.getExpression(0) instanceof ClosureExpression;
}
};
}
}