org.codehaus.groovy.transform.ToStringASTTransformation Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of groovy Show documentation
Show all versions of groovy Show documentation
Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.codehaus.groovy.transform;
import groovy.transform.ToString;
import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.AnnotatedNode;
import org.codehaus.groovy.ast.AnnotationNode;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.PropertyNode;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.expr.VariableExpression;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.control.CompilePhase;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.runtime.InvokerHelper;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import static org.codehaus.groovy.ast.ClassHelper.make;
import static org.codehaus.groovy.ast.tools.GeneralUtils.*;
/**
* Handles generation of code for the @ToString annotation.
*
* @author Paul King
* @author Andre Steingress
*/
@GroovyASTTransformation(phase = CompilePhase.CANONICALIZATION)
public class ToStringASTTransformation extends AbstractASTTransformation {
static final Class MY_CLASS = ToString.class;
static final ClassNode MY_TYPE = make(MY_CLASS);
static final String MY_TYPE_NAME = "@" + MY_TYPE.getNameWithoutPackage();
private static final ClassNode STRINGBUILDER_TYPE = make(StringBuilder.class);
private static final ClassNode INVOKER_TYPE = make(InvokerHelper.class);
public void visit(ASTNode[] nodes, SourceUnit source) {
init(nodes, source);
AnnotatedNode parent = (AnnotatedNode) nodes[1];
AnnotationNode anno = (AnnotationNode) nodes[0];
if (!MY_TYPE.equals(anno.getClassNode())) return;
if (parent instanceof ClassNode) {
ClassNode cNode = (ClassNode) parent;
if (!checkNotInterface(cNode, MY_TYPE_NAME)) return;
boolean includeSuper = memberHasValue(anno, "includeSuper", true);
boolean includeSuperProperties = memberHasValue(anno, "includeSuperProperties", true);
boolean cacheToString = memberHasValue(anno, "cache", true);
if (includeSuper && cNode.getSuperClass().getName().equals("java.lang.Object")) {
addError("Error during " + MY_TYPE_NAME + " processing: includeSuper=true but '" + cNode.getName() + "' has no super class.", anno);
}
boolean includeNames = memberHasValue(anno, "includeNames", true);
boolean includeFields = memberHasValue(anno, "includeFields", true);
List excludes = getMemberList(anno, "excludes");
List includes = getMemberList(anno, "includes");
boolean ignoreNulls = memberHasValue(anno, "ignoreNulls", true);
boolean includePackage = !memberHasValue(anno, "includePackage", false);
if (hasAnnotation(cNode, CanonicalASTTransformation.MY_TYPE)) {
AnnotationNode canonical = cNode.getAnnotations(CanonicalASTTransformation.MY_TYPE).get(0);
if (excludes == null || excludes.isEmpty()) excludes = getMemberList(canonical, "excludes");
if (includes == null || includes.isEmpty()) includes = getMemberList(canonical, "includes");
}
if (!checkIncludeExclude(anno, excludes, includes, MY_TYPE_NAME)) return;
createToString(cNode, includeSuper, includeFields, excludes, includes, includeNames, ignoreNulls, includePackage, cacheToString, includeSuperProperties);
}
}
public static void createToString(ClassNode cNode, boolean includeSuper, boolean includeFields, List excludes, List includes, boolean includeNames) {
createToString(cNode, includeSuper, includeFields, excludes, includes, includeNames, false);
}
public static void createToString(ClassNode cNode, boolean includeSuper, boolean includeFields, List excludes, List includes, boolean includeNames, boolean ignoreNulls) {
createToString(cNode, includeSuper, includeFields, excludes, includes, includeNames, ignoreNulls, true);
}
public static void createToString(ClassNode cNode, boolean includeSuper, boolean includeFields, List excludes, List includes, boolean includeNames, boolean ignoreNulls, boolean includePackage) {
createToString(cNode, includeSuper, includeFields, excludes, includes, includeNames, ignoreNulls, includePackage, false);
}
public static void createToString(ClassNode cNode, boolean includeSuper, boolean includeFields, List excludes, List includes, boolean includeNames, boolean ignoreNulls, boolean includePackage, boolean cache) {
createToString(cNode, includeSuper, includeFields, excludes, includes, includeNames, ignoreNulls, includePackage, false, false);
}
public static void createToString(ClassNode cNode, boolean includeSuper, boolean includeFields, List excludes, List includes, boolean includeNames, boolean ignoreNulls, boolean includePackage, boolean cache, boolean includeSuperProperties) {
// make a public method if none exists otherwise try a private method with leading underscore
boolean hasExistingToString = hasDeclaredMethod(cNode, "toString", 0);
if (hasExistingToString && hasDeclaredMethod(cNode, "_toString", 0)) return;
final BlockStatement body = new BlockStatement();
Expression tempToString;
if (cache) {
final FieldNode cacheField = cNode.addField("$to$string", ACC_PRIVATE | ACC_SYNTHETIC, ClassHelper.STRING_TYPE, null);
final Expression savedToString = varX(cacheField);
body.addStatement(ifS(
equalsNullX(savedToString),
assignS(savedToString, calculateToStringStatements(cNode, includeSuper, includeFields, excludes, includes, includeNames, ignoreNulls, includePackage, includeSuperProperties, body))
));
tempToString = savedToString;
} else {
tempToString = calculateToStringStatements(cNode, includeSuper, includeFields, excludes, includes, includeNames, ignoreNulls, includePackage, includeSuperProperties, body);
}
body.addStatement(returnS(tempToString));
cNode.addMethod(new MethodNode(hasExistingToString ? "_toString" : "toString", hasExistingToString ? ACC_PRIVATE : ACC_PUBLIC,
ClassHelper.STRING_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, body));
}
private static Expression calculateToStringStatements(ClassNode cNode, boolean includeSuper, boolean includeFields, List excludes, List includes, boolean includeNames, boolean ignoreNulls, boolean includePackage, boolean includeSuperProperties, BlockStatement body) {
// def _result = new StringBuilder()
final Expression result = varX("_result");
body.addStatement(declS(result, ctorX(STRINGBUILDER_TYPE)));
// def $toStringFirst = true
final VariableExpression first = varX("$toStringFirst");
body.addStatement(declS(first, constX(Boolean.TRUE)));
// (
String className = (includePackage) ? cNode.getName() : cNode.getNameWithoutPackage();
body.addStatement(appendS(result, constX(className + "(")));
// append properties
List pList;
if (includeSuperProperties) {
pList = getAllProperties(cNode);
Iterator pIterator = pList.iterator();
while (pIterator.hasNext()) {
if (pIterator.next().isStatic()) {
pIterator.remove();
}
}
} else {
pList = getInstanceProperties(cNode);
}
for (PropertyNode pNode : pList) {
if (shouldSkip(pNode.getName(), excludes, includes)) continue;
Expression getter = getterX(cNode, pNode);
appendValue(body, result, first, getter, pNode.getName(), includeNames, ignoreNulls);
}
// append fields if needed
if (includeFields) {
List fList = new ArrayList();
fList.addAll(getInstanceNonPropertyFields(cNode));
for (FieldNode fNode : fList) {
if (shouldSkip(fNode.getName(), excludes, includes)) continue;
appendValue(body, result, first, varX(fNode), fNode.getName(), includeNames, ignoreNulls);
}
}
// append super if needed
if (includeSuper) {
appendCommaIfNotFirst(body, result, first);
appendPrefix(body, result, "super", includeNames);
// not through MOP to avoid infinite recursion
body.addStatement(appendS(result, callSuperX("toString")));
}
// wrap up
body.addStatement(appendS(result, constX(")")));
MethodCallExpression toString = callX(result, "toString");
toString.setImplicitThis(false);
return toString;
}
private static void appendValue(BlockStatement body, Expression result, VariableExpression first, Expression value, String name, boolean includeNames, boolean ignoreNulls) {
final BlockStatement thenBlock = new BlockStatement();
final Statement appendValue = ignoreNulls ? ifS(notNullX(value), thenBlock) : thenBlock;
appendCommaIfNotFirst(thenBlock, result, first);
appendPrefix(thenBlock, result, name, includeNames);
thenBlock.addStatement(ifElseS(
sameX(value, new VariableExpression("this")),
appendS(result, constX("(this)")),
appendS(result, callX(INVOKER_TYPE, "toString", value))));
body.addStatement(appendValue);
}
private static void appendCommaIfNotFirst(BlockStatement body, Expression result, VariableExpression first) {
// if ($toStringFirst) $toStringFirst = false else result.append(", ")
body.addStatement(ifElseS(
first,
assignS(first, ConstantExpression.FALSE),
appendS(result, constX(", "))));
}
private static void appendPrefix(BlockStatement body, Expression result, String name, boolean includeNames) {
if (includeNames) body.addStatement(toStringPropertyName(result, name));
}
private static Statement toStringPropertyName(Expression result, String fName) {
final BlockStatement body = new BlockStatement();
body.addStatement(appendS(result, constX(fName + ":")));
return body;
}
private static Statement appendS(Expression result, Expression expr) {
MethodCallExpression append = callX(result, "append", expr);
append.setImplicitThis(false);
return stmt(append);
}
}