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Groovy example source code file (ResolveVisitor.java)
This example Groovy source code file (ResolveVisitor.java) is included in the DevDaily.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.
The Groovy ResolveVisitor.java source code
/*
* Copyright 2003-2010 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.codehaus.groovy.control;
import groovy.lang.GroovyClassLoader;
import org.codehaus.groovy.ast.*;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.CatchStatement;
import org.codehaus.groovy.ast.stmt.ForStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.classgen.Verifier;
import org.codehaus.groovy.control.messages.ExceptionMessage;
import org.codehaus.groovy.syntax.Types;
import org.codehaus.groovy.GroovyBugError;
import org.objectweb.asm.Opcodes;
import java.io.File;
import java.io.IOException;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Modifier;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.*;
/**
* Visitor to resolve Types and convert VariableExpression to
* ClassExpressions if needed. The ResolveVisitor will try to
* find the Class for a ClassExpression and prints an error if
* it fails to do so. Constructions like C[], foo as C, (C) foo
* will force creation of a ClassExpression for C
* <p/>
* Note: the method to start the resolving is startResolving(ClassNode, SourceUnit).
*
* @author Jochen Theodorou
* @author Roshan Dawrani
* @author Alex Tkachman
*/
public class ResolveVisitor extends ClassCodeExpressionTransformer {
private ClassNode currentClass;
// note: BigInteger and BigDecimal are also imported by default
public static final String[] DEFAULT_IMPORTS = {"java.lang.", "java.io.", "java.net.", "java.util.", "groovy.lang.", "groovy.util."};
private CompilationUnit compilationUnit;
private Map cachedClasses = new HashMap();
private static final Object NO_CLASS = new Object();
private SourceUnit source;
private VariableScope currentScope;
private boolean isTopLevelProperty = true;
private boolean inPropertyExpression = false;
private boolean inClosure = false;
private Map<String, GenericsType> genericParameterNames = new HashMap();
private Set<FieldNode> fieldTypesChecked = new HashSet();
private boolean checkingVariableTypeInDeclaration = false;
private ImportNode currImportNode = null;
private MethodNode currentMethod;
/**
* we use ConstructedClassWithPackage to limit the resolving the compiler
* does when combining package names and class names. The idea
* that if we use a package, then we do not want to replace the
* '.' with a '$' for the package part, only for the class name
* part. There is also the case of a imported class, so this logic
* can't be done in these cases...
*/
private static class ConstructedClassWithPackage extends ClassNode {
String prefix;
String className;
public ConstructedClassWithPackage(String pkg, String name) {
super(pkg+name, Opcodes.ACC_PUBLIC,ClassHelper.OBJECT_TYPE);
isPrimaryNode = false;
this.prefix = pkg;
this.className = name;
}
public String getName() {
if (redirect()!=this) return super.getName();
return prefix+className;
}
public boolean hasPackageName() {
if (redirect()!=this) return super.hasPackageName();
return className.indexOf('.')!=-1;
}
public String setName(String name) {
if (redirect()!=this) {
return super.setName(name);
} else {
throw new GroovyBugError("ConstructedClassWithPackage#setName should not be called");
}
}
}
/**
* we use LowerCaseClass to limit the resolving the compiler
* does for vanilla names starting with a lower case letter. The idea
* that if we use a vanilla name with a lower case letter, that this
* is in most cases no class. If it is a class the class needs to be
* imported explicitly. The efffect is that in an expression like
* "def foo = bar" we do not have to use a loadClass call to check the
* name foo and bar for being classes. Instead we will ask the module
* for an alias for this name which is much faster.
*/
private static class LowerCaseClass extends ClassNode {
String className;
public LowerCaseClass(String name) {
super(name, Opcodes.ACC_PUBLIC,ClassHelper.OBJECT_TYPE);
isPrimaryNode = false;
this.className = name;
}
public String getName() {
if (redirect()!=this) return super.getName();
return className;
}
public boolean hasPackageName() {
if (redirect()!=this) return super.hasPackageName();
return false;
}
public String setName(String name) {
if (redirect()!=this) {
return super.setName(name);
} else {
throw new GroovyBugError("ConstructedClassWithPackage#setName should not be called");
}
}
}
public ResolveVisitor(CompilationUnit cu) {
compilationUnit = cu;
}
public void startResolving(ClassNode node, SourceUnit source) {
this.source = source;
visitClass(node);
}
protected void visitConstructorOrMethod(MethodNode node, boolean isConstructor) {
VariableScope oldScope = currentScope;
currentScope = node.getVariableScope();
Map<String, GenericsType> oldPNames = genericParameterNames;
genericParameterNames = new HashMap<String, GenericsType>(genericParameterNames);
resolveGenericsHeader(node.getGenericsTypes());
Parameter[] paras = node.getParameters();
for (Parameter p : paras) {
p.setInitialExpression(transform(p.getInitialExpression()));
resolveOrFail(p.getType(), p.getType());
visitAnnotations(p);
}
ClassNode[] exceptions = node.getExceptions();
for (ClassNode t : exceptions) {
resolveOrFail(t, node);
}
resolveOrFail(node.getReturnType(), node);
MethodNode oldCurrentMethod = currentMethod;
currentMethod = node;
super.visitConstructorOrMethod(node, isConstructor);
currentMethod = oldCurrentMethod;
genericParameterNames = oldPNames;
currentScope = oldScope;
}
public void visitField(FieldNode node) {
ClassNode t = node.getType();
if(!fieldTypesChecked.contains(node)) {
resolveOrFail(t, node);
}
super.visitField(node);
}
public void visitProperty(PropertyNode node) {
ClassNode t = node.getType();
resolveOrFail(t, node);
super.visitProperty(node);
fieldTypesChecked.add(node.getField());
}
private boolean resolveToInner (ClassNode type) {
// we do not do our name mangling to find an inner class
// if the type is a ConstructedClassWithPackage, because in this case we
// are resolving the name at a different place already
if (type instanceof ConstructedClassWithPackage) return false;
String name = type.getName();
String saved = name;
while (true) {
int len = name.lastIndexOf('.');
if (len == -1) break;
name = name.substring(0,len) + "$" + name.substring(len+1);
type.setName(name);
if (resolve(type)) return true;
}
if(resolveToInnerEnum (type)) return true;
type.setName(saved);
return false;
}
private boolean resolveToInnerEnum (ClassNode type) {
// GROOVY-3110: It may be an inner enum defined by this class itself, in which case it does not need to be
// explicitly qualified by the currentClass name
String name = type.getName();
if(currentClass != type && !name.contains(".") && type.getClass().equals(ClassNode.class)) {
type.setName(currentClass.getName() + "$" + name);
if (resolve(type)) return true;
}
return false;
}
private void resolveOrFail(ClassNode type, String msg, ASTNode node) {
if (resolve(type)) return;
if (resolveToInner(type)) return;
addError("unable to resolve class " + type.getName() + " " + msg, node);
}
private void resolveOrFail(ClassNode type, ASTNode node, boolean prefereImports) {
resolveGenericsTypes(type.getGenericsTypes());
if (prefereImports && resolveAliasFromModule(type)) return;
resolveOrFail(type, node);
}
private void resolveOrFail(ClassNode type, ASTNode node) {
resolveOrFail(type, "", node);
}
private boolean resolve(ClassNode type) {
return resolve(type, true, true, true);
}
private boolean resolve(ClassNode type, boolean testModuleImports, boolean testDefaultImports, boolean testStaticInnerClasses) {
resolveGenericsTypes(type.getGenericsTypes());
if (type.isResolved() || type.isPrimaryClassNode()) return true;
if (type.isArray()) {
ClassNode element = type.getComponentType();
boolean resolved = resolve(element, testModuleImports, testDefaultImports, testStaticInnerClasses);
if (resolved) {
ClassNode cn = element.makeArray();
type.setRedirect(cn);
}
return resolved;
}
// test if vanilla name is current class name
if (currentClass == type) return true;
if (genericParameterNames.get(type.getName()) != null) {
GenericsType gt = genericParameterNames.get(type.getName());
type.setRedirect(gt.getType());
type.setGenericsTypes(new GenericsType[]{gt});
type.setGenericsPlaceHolder(true);
return true;
}
if (currentClass.getNameWithoutPackage().equals(type.getName())) {
type.setRedirect(currentClass);
return true;
}
return resolveNestedClass(type) ||
resolveFromModule(type, testModuleImports) ||
resolveFromCompileUnit(type) ||
resolveFromDefaultImports(type, testDefaultImports) ||
resolveFromStaticInnerClasses(type, testStaticInnerClasses) ||
resolveToClass(type);
}
private boolean resolveNestedClass(ClassNode type) {
// we have for example a class name A, are in class X
// and there is a nested class A$X. we want to be able
// to access that class directly, so A becomes a valid
// name in X.
// GROOVY-4043: Do this check up the hierarchy, if needed
Map<String, ClassNode> hierClasses = new LinkedHashMap();
ClassNode val;
String name;
for(ClassNode classToCheck = currentClass; classToCheck != ClassHelper.OBJECT_TYPE;
classToCheck = classToCheck.getSuperClass()) {
if(classToCheck == null || hierClasses.containsKey(classToCheck.getName())) break;
hierClasses.put(classToCheck.getName(), classToCheck);
}
for (ClassNode classToCheck : hierClasses.values()) {
name = classToCheck.getName()+"$"+type.getName();
val = ClassHelper.make(name);
if (resolveFromCompileUnit(val)) {
type.setRedirect(val);
return true;
}
}
// another case we want to check here is if we are in a
// nested class A$B$C and want to access B without
// qualifying it by A.B. A alone will work, since that
// is the qualified (minus package) name of that class
// anyway.
// That means if the current class is not an InnerClassNode
// there is nothing to be done.
if (!(currentClass instanceof InnerClassNode)) return false;
// since we have B and want to get A we start with the most
// outer class, put them together and then see if that does
// already exist. In case of B from within A$B we are done
// after the first step already. In case of for example
// A.B.C.D.E.F and accessing E from F we test A$E=failed,
// A$B$E=failed, A$B$C$E=fail, A$B$C$D$E=success
LinkedList<ClassNode> outerClasses = new LinkedList();
ClassNode outer = currentClass.getOuterClass();
while (outer!=null) {
outerClasses.addFirst(outer);
outer = outer.getOuterClass();
}
// most outer class is now element 0
for (ClassNode testNode : outerClasses) {
name = testNode.getName()+"$"+type.getName();
val = ClassHelper.make(name);
if (resolveFromCompileUnit(val)) {
type.setRedirect(val);
return true;
}
}
return false;
}
// NOTE: copied from GroovyClassLoader
private long getTimeStamp(Class cls) {
return Verifier.getTimestamp(cls);
}
// NOTE: copied from GroovyClassLoader
private boolean isSourceNewer(URL source, Class cls) {
try {
long lastMod;
// Special handling for file:// protocol, as getLastModified() often reports
// incorrect results (-1)
if (source.getProtocol().equals("file")) {
// Coerce the file URL to a File
String path = source.getPath().replace('/', File.separatorChar).replace('|', ':');
File file = new File(path);
lastMod = file.lastModified();
} else {
URLConnection conn = source.openConnection();
lastMod = conn.getLastModified();
conn.getInputStream().close();
}
return lastMod > getTimeStamp(cls);
} catch (IOException e) {
// if the stream can't be opened, let's keep the old reference
return false;
}
}
private boolean resolveToScript(ClassNode type) {
String name = type.getName();
if (name.startsWith("java.")) return type.isResolved();
//TODO: don't ignore inner static classes completely
if (name.indexOf('$') != -1) return type.isResolved();
ModuleNode module = currentClass.getModule();
if (module.hasPackageName() && name.indexOf('.') == -1) return type.isResolved();
// try to find a script from classpath
GroovyClassLoader gcl = compilationUnit.getClassLoader();
URL url = null;
try {
url = gcl.getResourceLoader().loadGroovySource(name);
} catch (MalformedURLException e) {
// fall through and let the URL be null
}
if (url != null) {
if (type.isResolved()) {
Class cls = type.getTypeClass();
// if the file is not newer we don't want to recompile
if (!isSourceNewer(url, cls)) return true;
// since we came to this, we want to recompile
cachedClasses.remove(type.getName());
type.setRedirect(null);
}
SourceUnit su = compilationUnit.addSource(url);
currentClass.getCompileUnit().addClassNodeToCompile(type, su);
return true;
}
// type may be resolved through the classloader before
return type.isResolved();
}
private String replaceLastPoint(String name) {
int lastPoint = name.lastIndexOf('.');
name = new StringBuffer()
.append(name.substring(0, lastPoint))
.append("$")
.append(name.substring(lastPoint + 1))
.toString();
return name;
}
private boolean resolveFromStaticInnerClasses(ClassNode type, boolean testStaticInnerClasses) {
// a class consisting of a vanilla name can never be
// a static inner class, because at least one dot is
// required for this. Example: foo.bar -> foo$bar
if (type instanceof LowerCaseClass) return false;
// try to resolve a public static inner class' name
testStaticInnerClasses &= type.hasPackageName();
if (testStaticInnerClasses) {
if (type instanceof ConstructedClassWithPackage) {
// we replace '.' only in the className part
// with '$' to find an inner class. The case that
// the package is really a class is handled elsewhere
ConstructedClassWithPackage tmp = (ConstructedClassWithPackage) type;
String savedName = tmp.className;
tmp.className = replaceLastPoint(savedName);
if (resolve(tmp, false, true, true)) {
type.setRedirect(tmp.redirect());
return true;
}
tmp.className = savedName;
} else {
String savedName = type.getName();
String replacedPointType = replaceLastPoint(savedName);
type.setName(replacedPointType);
if (resolve(type, false, true, true)) return true;
type.setName(savedName);
}
}
return false;
}
private boolean resolveFromDefaultImports(ClassNode type, boolean testDefaultImports) {
// test default imports
testDefaultImports &= !type.hasPackageName();
// we do not resolve a vanilla name starting with a lower case letter
// try to resolve against a default import, because we know that the
// default packages do not contain classes like these
testDefaultImports &= !(type instanceof LowerCaseClass);
if (testDefaultImports) {
for (int i = 0, size = DEFAULT_IMPORTS.length; i < size; i++) {
String packagePrefix = DEFAULT_IMPORTS[i];
String name = type.getName();
// We limit the inner class lookups here by using ConstructedClassWithPackage.
// This way only the name will change, the packagePrefix will
// not be included in the lookup. The case where the
// packagePrefix is really a class is handled elsewhere.
// WARNING: This code does not expect a class that has a static
// inner class in DEFAULT_IMPORTS
ConstructedClassWithPackage tmp = new ConstructedClassWithPackage(packagePrefix,name);
if (resolve(tmp, false, false, false)) {
type.setRedirect(tmp.redirect());
return true;
}
}
String name = type.getName();
if (name.equals("BigInteger")) {
type.setRedirect(ClassHelper.BigInteger_TYPE);
return true;
} else if (name.equals("BigDecimal")) {
type.setRedirect(ClassHelper.BigDecimal_TYPE);
return true;
}
}
return false;
}
private boolean resolveFromCompileUnit(ClassNode type) {
// look into the compile unit if there is a class with that name
CompileUnit compileUnit = currentClass.getCompileUnit();
if (compileUnit == null) return false;
ClassNode cuClass = compileUnit.getClass(type.getName());
if (cuClass != null) {
if (type != cuClass) type.setRedirect(cuClass);
return true;
}
return false;
}
private void ambiguousClass(ClassNode type, ClassNode iType, String name) {
if (type.getName().equals(iType.getName())) {
addError("reference to " + name + " is ambiguous, both class " + type.getName() + " and " + iType.getName() + " match", type);
} else {
type.setRedirect(iType);
}
}
private boolean resolveAliasFromModule(ClassNode type) {
// In case of getting a ConstructedClassWithPackage here we do not do checks for partial
// matches with imported classes. The ConstructedClassWithPackage is already a constructed
// node and any subclass resolving will then take place elsewhere
if (type instanceof ConstructedClassWithPackage) return false;
ModuleNode module = currentClass.getModule();
if (module == null) return false;
String name = type.getName();
// check module node imports aliases
// the while loop enables a check for inner classes which are not fully imported,
// but visible as the surrounding class is imported and the inner class is public/protected static
String pname = name;
int index = name.length();
/*
* we have a name foo.bar and an import foo.foo. This means foo.bar is possibly
* foo.foo.bar rather than foo.bar. This means to cut at the dot in foo.bar and
* foo for import
*/
while (true) {
pname = name.substring(0, index);
ClassNode aliasedNode = null;
ImportNode importNode = module.getImport(pname);
if (importNode != null && importNode != currImportNode) {
aliasedNode = importNode.getType();
}
if (aliasedNode == null) {
importNode = module.getStaticImports().get(pname);
if (importNode != null && importNode != currImportNode) {
// static alias only for inner classes and must be at end of chain
ClassNode tmp = ClassHelper.make(importNode.getType().getName() + "$" + importNode.getFieldName());
if (resolve(tmp, false, false, true)) {
if ((tmp.getModifiers() & Opcodes.ACC_STATIC) != 0) {
type.setRedirect(tmp.redirect());
return true;
}
}
}
}
if (aliasedNode != null) {
if (pname.length() == name.length()) {
// full match
// We can compare here by length, because pname is always
// a substring of name, so same length means they are equal.
type.setRedirect(aliasedNode);
return true;
} else {
//partial match
// At this point we know that we have a match for pname. This may
// mean, that name[pname.length()..<-1] is a static inner class.
// For this the rest of the name does not need any dots in its name.
// It is either completely a inner static class or it is not.
// Since we do not want to have useless lookups we create the name
// completely and use a ConstructedClassWithPackage to prevent lookups against the package.
String className = aliasedNode.getNameWithoutPackage() + '$' +
name.substring(pname.length() + 1).replace('.', '$');
ConstructedClassWithPackage tmp = new ConstructedClassWithPackage(aliasedNode.getPackageName()+".", className);
if (resolve(tmp, true, true, false)) {
type.setRedirect(tmp.redirect());
return true;
}
}
}
index = pname.lastIndexOf('.');
if (index == -1) break;
}
return false;
}
private boolean resolveFromModule(ClassNode type, boolean testModuleImports) {
// we decided if we have a vanilla name starting with a lower case
// letter that we will not try to resolve this name against .*
// imports. Instead a full import is needed for these.
// resolveAliasFromModule will do this check for us. This method
// does also check the module contains a class in the same package
// of this name. This check is not done for vanilla names starting
// with a lower case letter anymore
if (type instanceof LowerCaseClass) {
return resolveAliasFromModule(type);
}
String name = type.getName();
ModuleNode module = currentClass.getModule();
if (module == null) return false;
boolean newNameUsed = false;
// we add a package if there is none yet and the module has one. But we
// do not add that if the type is a ConstructedClassWithPackage. The code in ConstructedClassWithPackage
// hasPackageName() will return true if ConstructedClassWithPackage#className has no dots.
// but since the prefix may have them and the code there does ignore that
// fact. We check here for ConstructedClassWithPackage.
if (!type.hasPackageName() && module.hasPackageName() && !(type instanceof ConstructedClassWithPackage)) {
type.setName(module.getPackageName() + name);
newNameUsed = true;
}
// look into the module node if there is a class with that name
List<ClassNode> moduleClasses = module.getClasses();
for (ClassNode mClass : moduleClasses) {
if (mClass.getName().equals(type.getName())) {
if (mClass != type) type.setRedirect(mClass);
return true;
}
}
if (newNameUsed) type.setName(name);
if (testModuleImports) {
if (resolveAliasFromModule(type)) return true;
if (module.hasPackageName()) {
// check package this class is defined in. The usage of ConstructedClassWithPackage here
// means, that the module package will not be involved when the
// compiler tries to find an inner class.
ConstructedClassWithPackage tmp = new ConstructedClassWithPackage(module.getPackageName(), name);
if (resolve(tmp, false, false, false)) {
ambiguousClass(type, tmp, name);
type.setRedirect(tmp.redirect());
return true;
}
}
// check module static imports (for static inner classes)
for (ImportNode importNode : module.getStaticImports().values()) {
if (importNode.getFieldName().equals(name)) {
ClassNode tmp = ClassHelper.make(importNode.getType().getName() + "$" + name);
if (resolve(tmp, false, false, true)) {
if ((tmp.getModifiers() & Opcodes.ACC_STATIC) != 0) {
type.setRedirect(tmp.redirect());
return true;
}
}
}
}
// check module node import packages
for (ImportNode importNode : module.getStarImports()) {
String packagePrefix = importNode.getPackageName();
// We limit the inner class lookups here by using ConstructedClassWithPackage.
// This way only the name will change, the packagePrefix will
// not be included in the lookup. The case where the
// packagePrefix is really a class is handled elsewhere.
ConstructedClassWithPackage tmp = new ConstructedClassWithPackage(packagePrefix, name);
if (resolve(tmp, false, false, true)) {
ambiguousClass(type, tmp, name);
type.setRedirect(tmp.redirect());
return true;
}
}
// check for star imports (import static pkg.Outer.*) matching static inner classes
for (ImportNode importNode : module.getStaticStarImports().values()) {
ClassNode tmp = ClassHelper.make(importNode.getClassName() + "$" + name);
if (resolve(tmp, false, false, true)) {
if ((tmp.getModifiers() & Opcodes.ACC_STATIC) != 0) {
ambiguousClass(type, tmp, name);
type.setRedirect(tmp.redirect());
return true;
}
}
}
}
return false;
}
private boolean resolveToClass(ClassNode type) {
String name = type.getName();
// We use here the class cache cachedClasses to prevent
// calls to ClassLoader#loadClass. disabling this cache will
// cause a major performance hit. Unlike at the end of this
// method we do not return true or false depending on if we
// want to recompile or not. If the class was cached, then
// we do not want to recompile, recompilation is already
// scheduled then
Object cached = cachedClasses.get(name);
if (cached == NO_CLASS)
return false;
if (cached != null) {
// cached == SCRIPT should not happen here!
type.setRedirect((ClassNode) cached);
return true;
}
// We do not need to check instances of LowerCaseClass
// to be a Class, because unless there was an import for
// for this we do not lookup these cases. This was a decision
// made on the mailing list. To ensure we will not visit this
// method again we set a NO_CLASS for this name
if (type instanceof LowerCaseClass) {
cachedClasses.put(name,NO_CLASS);
return false;
}
if (currentClass.getModule().hasPackageName() && name.indexOf('.') == -1) return false;
GroovyClassLoader loader = compilationUnit.getClassLoader();
Class cls;
try {
// NOTE: it's important to do no lookup against script files
// here since the GroovyClassLoader would create a new CompilationUnit
cls = loader.loadClass(name, false, true);
} catch (ClassNotFoundException cnfe) {
cachedClasses.put(name, NO_CLASS);
return resolveToScript(type);
} catch (CompilationFailedException cfe) {
compilationUnit.getErrorCollector().addErrorAndContinue(new ExceptionMessage(cfe, true, source));
return resolveToScript(type);
}
//TODO: the case of a NoClassDefFoundError needs a bit more research
// a simple recompilation is not possible it seems. The current class
// we are searching for is there, so we should mark that somehow.
// Basically the missing class needs to be completely compiled before
// we can again search for the current name.
/*catch (NoClassDefFoundError ncdfe) {
cachedClasses.put(name,SCRIPT);
return false;
}*/
if (cls == null) return false;
ClassNode cn = ClassHelper.make(cls);
cachedClasses.put(name, cn);
type.setRedirect(cn);
//NOTE: we might return false here even if we found a class,
// because we want to give a possible script a chance to
// recompile. This can only be done if the loader was not
// the instance defining the class.
return cls.getClassLoader() == loader || resolveToScript(type);
}
public Expression transform(Expression exp) {
if (exp == null) return null;
Expression ret = null;
if (exp instanceof VariableExpression) {
ret = transformVariableExpression((VariableExpression) exp);
} else if (exp.getClass() == PropertyExpression.class) {
ret = transformPropertyExpression((PropertyExpression) exp);
} else if (exp instanceof DeclarationExpression) {
ret = transformDeclarationExpression((DeclarationExpression) exp);
} else if (exp instanceof BinaryExpression) {
ret = transformBinaryExpression((BinaryExpression) exp);
} else if (exp instanceof MethodCallExpression) {
ret = transformMethodCallExpression((MethodCallExpression) exp);
} else if (exp instanceof ClosureExpression) {
ret = transformClosureExpression((ClosureExpression) exp);
} else if (exp instanceof ConstructorCallExpression) {
ret = transformConstructorCallExpression((ConstructorCallExpression) exp);
} else if (exp instanceof AnnotationConstantExpression) {
ret = transformAnnotationConstantExpression((AnnotationConstantExpression) exp);
} else {
resolveOrFail(exp.getType(), exp);
ret = exp.transformExpression(this);
}
if (ret!=null && ret!=exp) ret.setSourcePosition(exp);
return ret;
}
private String lookupClassName(PropertyExpression pe) {
boolean doInitialClassTest=true;
String name = "";
// this loop builds a name from right to left each name part
// separated by "."
for (Expression it = pe; it != null; it = ((PropertyExpression) it).getObjectExpression()) {
if (it instanceof VariableExpression) {
VariableExpression ve = (VariableExpression) it;
// stop at super and this
if (ve.isSuperExpression() || ve.isThisExpression()) {
return null;
}
String varName = ve.getName();
if (doInitialClassTest) {
// we are at the first name part. This is the right most part.
// If this part is in lower case, then we do not need a class
// check. other parts of the property expression will be tested
// by a different method call to this method, so foo.Bar.bar
// can still be resolved to the class foo.Bar and the static
// field bar.
if (!testVanillaNameForClass(varName)) return null;
doInitialClassTest = false;
name = varName;
} else {
name = varName + "." + name;
}
break;
}
// anything other than PropertyExpressions or
// VariableExpressions will stop resolving
else if (it.getClass() != PropertyExpression.class) {
return null;
} else {
PropertyExpression current = (PropertyExpression) it;
String propertyPart = current.getPropertyAsString();
// the class property stops resolving, dynamic property names too
if (propertyPart == null || propertyPart.equals("class")) {
return null;
}
if (doInitialClassTest) {
// we are at the first name part. This is the right most part.
// If this part is in lower case, then we do not need a class
// check. other parts of the property expression will be tested
// by a different method call to this method, so foo.Bar.bar
// can still be resolved to the class foo.Bar and the static
// field bar.
if (!testVanillaNameForClass(propertyPart)) return null;
doInitialClassTest= false;
name = propertyPart;
} else {
name = propertyPart + "." + name;
}
}
}
if (name.length() == 0) return null;
return name;
}
// iterate from the inner most to the outer and check for classes
// this check will ignore a .class property, for Example Integer.class will be
// a PropertyExpression with the ClassExpression of Integer as objectExpression
// and class as property
private Expression correctClassClassChain(PropertyExpression pe) {
LinkedList<Expression> stack = new LinkedList();
ClassExpression found = null;
for (Expression it = pe; it != null; it = ((PropertyExpression) it).getObjectExpression()) {
if (it instanceof ClassExpression) {
found = (ClassExpression) it;
break;
} else if (!(it.getClass() == PropertyExpression.class)) {
return pe;
}
stack.addFirst(it);
}
if (found == null) return pe;
if (stack.isEmpty()) return pe;
Object stackElement = stack.removeFirst();
if (!(stackElement.getClass() == PropertyExpression.class)) return pe;
PropertyExpression classPropertyExpression = (PropertyExpression) stackElement;
String propertyNamePart = classPropertyExpression.getPropertyAsString();
if (propertyNamePart == null || !propertyNamePart.equals("class")) return pe;
found.setSourcePosition(classPropertyExpression);
if (stack.isEmpty()) return found;
stackElement = stack.removeFirst();
if (!(stackElement.getClass() == PropertyExpression.class)) return pe;
PropertyExpression classPropertyExpressionContainer = (PropertyExpression) stackElement;
classPropertyExpressionContainer.setObjectExpression(found);
return pe;
}
protected Expression transformPropertyExpression(PropertyExpression pe) {
boolean itlp = isTopLevelProperty;
boolean ipe = inPropertyExpression;
Expression objectExpression = pe.getObjectExpression();
inPropertyExpression = true;
isTopLevelProperty = (objectExpression.getClass() != PropertyExpression.class);
objectExpression = transform(objectExpression);
// we handle the property part as if it were not part of the property
inPropertyExpression = false;
Expression property = transform(pe.getProperty());
isTopLevelProperty = itlp;
inPropertyExpression = ipe;
boolean spreadSafe = pe.isSpreadSafe();
PropertyExpression old = pe;
pe = new PropertyExpression(objectExpression, property, pe.isSafe());
pe.setSpreadSafe(spreadSafe);
pe.setSourcePosition(old);
String className = lookupClassName(pe);
if (className != null) {
ClassNode type = ClassHelper.make(className);
if (resolve(type)) {
Expression ret = new ClassExpression(type);
ret.setSourcePosition(pe);
return ret;
}
}
if (objectExpression instanceof ClassExpression && pe.getPropertyAsString() != null) {
// possibly an inner class
ClassExpression ce = (ClassExpression) objectExpression;
ClassNode type = ClassHelper.make(ce.getType().getName() + "$" + pe.getPropertyAsString());
if (resolve(type, false, false, false)) {
Expression ret = new ClassExpression(type);
ret.setSourcePosition(ce);
return ret;
}
}
Expression ret = pe;
checkThisAndSuperAsPropertyAccess(pe);
if (isTopLevelProperty) ret = correctClassClassChain(pe);
return ret;
}
private void checkThisAndSuperAsPropertyAccess(PropertyExpression expression) {
if (expression.isImplicitThis()) return;
String prop = expression.getPropertyAsString();
if (prop == null) return;
if (!prop.equals("this") && !prop.equals("super")) return;
if (expression.getObjectExpression() instanceof ClassExpression) {
if (!(currentClass instanceof InnerClassNode)) {
addError("The usage of 'Class.this' and 'Class.super' is only allowed in nested/inner classes.", expression);
return;
}
ClassNode type = expression.getObjectExpression().getType();
ClassNode iterType = currentClass;
while (iterType != null) {
if (iterType.equals(type)) break;
iterType = iterType.getOuterClass();
}
if (iterType == null) {
addError("The class '" + type.getName() + "' needs to be an outer class of '" +
currentClass.getName() + "' when using '.this' or '.super'.", expression);
}
if ((currentClass.getModifiers() & Opcodes.ACC_STATIC) == 0) return;
if (!currentScope.isInStaticContext()) return;
addError("The usage of 'Class.this' and 'Class.super' within static nested class '" +
currentClass.getName() + "' is not allowed in a static context.", expression);
}
}
protected Expression transformVariableExpression(VariableExpression ve) {
visitAnnotations(ve);
Variable v = ve.getAccessedVariable();
if(!(v instanceof DynamicVariable) && !checkingVariableTypeInDeclaration) {
/*
* GROOVY-4009: when a normal variable is simply being used, there is no need to try to
* resolve its type. Variable type resolve should proceed only if the variable is being declared.
*/
return ve;
}
if (v instanceof DynamicVariable){
String name = ve.getName();
ClassNode t = ClassHelper.make(name);
// asking isResolved here allows to check if a primitive
// type name like "int" was used to make t. In such a case
// we have nothing left to do.
boolean isClass = t.isResolved();
if (!isClass) {
// It was no primitive type, so next we see if the name,
// which is a vanilla name, starts with a lower case letter.
// In that case we change it to a LowerCaseClass to let the
// compiler skip the resolving at several places in this class.
if (Character.isLowerCase(name.charAt(0))) {
t = new LowerCaseClass(name);
}
isClass = resolve(t);
if(!isClass) isClass = resolveToInnerEnum(t);
}
if (isClass) {
// the name is a type so remove it from the scoping
// as it is only a classvariable, it is only in
// referencedClassVariables, but must be removed
// for each parentscope too
for (VariableScope scope = currentScope; scope != null && !scope.isRoot(); scope = scope.getParent()) {
if (scope.isRoot()) break;
if (scope.removeReferencedClassVariable(ve.getName()) == null) break;
}
ClassExpression ce = new ClassExpression(t);
ce.setSourcePosition(ve);
return ce;
}
}
resolveOrFail(ve.getType(), ve);
return ve;
}
private boolean testVanillaNameForClass(String name) {
if (name==null || name.length()==0) return false;
return !Character.isLowerCase(name.charAt(0));
}
protected Expression transformBinaryExpression(BinaryExpression be) {
Expression left = transform(be.getLeftExpression());
int type = be.getOperation().getType();
if ((type == Types.ASSIGNMENT_OPERATOR || type == Types.EQUAL) &&
left instanceof ClassExpression) {
ClassExpression ce = (ClassExpression) left;
String error = "you tried to assign a value to the class '" + ce.getType().getName() + "'";
if (ce.getType().isScript()) {
error += ". Do you have a script with this name?";
}
addError(error, be.getLeftExpression());
return be;
}
if (left instanceof ClassExpression) {
if (be.getRightExpression() instanceof ListExpression) {
ListExpression list = (ListExpression) be.getRightExpression();
if (list.getExpressions().isEmpty()) {
// we have C[] if the list is empty -> should be an array then!
final ClassExpression ce = new ClassExpression(left.getType().makeArray());
ce.setSourcePosition(be);
return ce;
}
else {
// may be we have C[k1:v1, k2:v2] -> should become (C)([k1:v1, k2:v2])
boolean map = true;
for (Expression expression : list.getExpressions()) {
if(!(expression instanceof MapEntryExpression)) {
map = false;
break;
}
}
if (map) {
final MapExpression me = new MapExpression();
for (Expression expression : list.getExpressions()) {
me.addMapEntryExpression((MapEntryExpression) transform(expression));
}
me.setSourcePosition(list);
final CastExpression ce = new CastExpression(left.getType(), me);
ce.setSourcePosition(be);
return ce;
}
}
}
if (be.getRightExpression() instanceof MapEntryExpression) {
// may be we have C[k1:v1] -> should become (C)([k1:v1])
final MapExpression me = new MapExpression();
me.addMapEntryExpression((MapEntryExpression) transform(be.getRightExpression()));
me.setSourcePosition(be.getRightExpression());
final CastExpression ce = new CastExpression(left.getType(), me);
ce.setSourcePosition(be);
return ce;
}
}
Expression right = transform(be.getRightExpression());
be.setLeftExpression(left);
be.setRightExpression(right);
return be;
}
protected Expression transformClosureExpression(ClosureExpression ce) {
boolean oldInClosure = inClosure;
inClosure = true;
Parameter[] paras = ce.getParameters();
if (paras != null) {
for (Parameter para : paras) {
ClassNode t = para.getType();
resolveOrFail(t, ce);
visitAnnotations(para);
if (para.hasInitialExpression()) {
Object initialVal = para.getInitialExpression();
if (initialVal instanceof Expression) {
para.setInitialExpression(transform((Expression) initialVal));
}
}
visitAnnotations(para);
}
}
Statement code = ce.getCode();
if (code != null) code.visit(this);
inClosure = oldInClosure;
return ce;
}
protected Expression transformConstructorCallExpression(ConstructorCallExpression cce) {
ClassNode type = cce.getType();
resolveOrFail(type, cce);
if (Modifier.isAbstract(type.getModifiers())) {
addError("You cannot create an instance from the abstract " + getDescription(type) + ".", cce);
}
Expression ret = cce.transformExpression(this);
return ret;
}
private String getDescription(ClassNode node) {
return (node.isInterface() ? "interface" : "class") + " '" + node.getName() + "'";
}
protected Expression transformMethodCallExpression(MethodCallExpression mce) {
Expression args = transform(mce.getArguments());
Expression method = transform(mce.getMethod());
Expression object = transform(mce.getObjectExpression());
resolveGenericsTypes(mce.getGenericsTypes());
MethodCallExpression result = new MethodCallExpression(object, method, args);
result.setSafe(mce.isSafe());
result.setImplicitThis(mce.isImplicitThis());
result.setSpreadSafe(mce.isSpreadSafe());
result.setSourcePosition(mce);
result.setGenericsTypes(mce.getGenericsTypes());
result.setMethodTarget(mce.getMethodTarget());
return result;
}
protected Expression transformDeclarationExpression(DeclarationExpression de) {
visitAnnotations(de);
Expression oldLeft = de.getLeftExpression();
checkingVariableTypeInDeclaration = true;
Expression left = transform(oldLeft);
checkingVariableTypeInDeclaration = false;
if (left instanceof ClassExpression) {
ClassExpression ce = (ClassExpression) left;
addError("you tried to assign a value to the class " + ce.getType().getName(), oldLeft);
return de;
}
Expression right = transform(de.getRightExpression());
if (right == de.getRightExpression()) {
fixDeclaringClass(de);
return de;
}
DeclarationExpression newDeclExpr = new DeclarationExpression(left, de.getOperation(), right);
newDeclExpr.setDeclaringClass(de.getDeclaringClass());
fixDeclaringClass(newDeclExpr);
newDeclExpr.setSourcePosition(de);
newDeclExpr.addAnnotations(de.getAnnotations());
return newDeclExpr;
}
// TODO get normal resolving to set declaring class
private void fixDeclaringClass(DeclarationExpression newDeclExpr) {
if (newDeclExpr.getDeclaringClass() == null && currentMethod != null) {
newDeclExpr.setDeclaringClass(currentMethod.getDeclaringClass());
}
}
protected Expression transformAnnotationConstantExpression(AnnotationConstantExpression ace) {
AnnotationNode an = (AnnotationNode) ace.getValue();
ClassNode type = an.getClassNode();
resolveOrFail(type, ", unable to find class for annotation", an);
for (Map.Entry<String, Expression> member : an.getMembers().entrySet()) {
member.setValue(transform(member.getValue()));
}
return ace;
}
public void visitAnnotations(AnnotatedNode node) {
List<AnnotationNode> annotations = node.getAnnotations();
if (annotations.isEmpty()) return;
Map<String, AnnotationNode> tmpAnnotations = new HashMap();
ClassNode annType;
for (AnnotationNode an : annotations) {
// skip built-in properties
if (an.isBuiltIn()) continue;
annType = an.getClassNode();
resolveOrFail(annType, ", unable to find class for annotation", an);
for (Map.Entry<String, Expression> member : an.getMembers().entrySet()) {
Expression newValue = transform(member.getValue());
newValue = transformInlineConstants(newValue);
member.setValue(newValue);
checkAnnotationMemberValue(newValue);
}
if(annType.isResolved()) {
Class annTypeClass = annType.getTypeClass();
Retention retAnn = (Retention) annTypeClass.getAnnotation(Retention.class);
if (retAnn != null && retAnn.value().equals(RetentionPolicy.RUNTIME)) {
AnnotationNode anyPrevAnnNode = tmpAnnotations.put(annTypeClass.getName(), an);
if(anyPrevAnnNode != null) {
addError("Cannot specify duplicate annotation on the same member : " + annType.getName(), an);
}
}
}
}
}
// resolve constant-looking expressions statically (do here as gets transformed away later)
private Expression transformInlineConstants(Expression exp) {
if (exp instanceof PropertyExpression) {
PropertyExpression pe = (PropertyExpression) exp;
if (pe.getObjectExpression() instanceof ClassExpression) {
ClassExpression ce = (ClassExpression) pe.getObjectExpression();
ClassNode type = ce.getType();
if (type.isEnum())
return exp;
FieldNode fn = type.getField(pe.getPropertyAsString());
if (fn != null && !fn.isEnum() && fn.isStatic() && fn.isFinal()) {
if (fn.getInitialValueExpression() instanceof ConstantExpression) {
return fn.getInitialValueExpression();
}
}
}
} else if (exp instanceof ListExpression) {
ListExpression le = (ListExpression) exp;
ListExpression result = new ListExpression();
for (Expression e : le.getExpressions()) {
result.addExpression(transformInlineConstants(e));
}
return result;
} else if (exp instanceof AnnotationConstantExpression) {
ConstantExpression ce = (ConstantExpression) exp;
if (ce.getValue() instanceof AnnotationNode) {
// replicate a little bit of AnnotationVisitor here
// because we can't wait until later to do this
AnnotationNode an = (AnnotationNode) ce.getValue();
for (Map.Entry<String, Expression> member : an.getMembers().entrySet()) {
member.setValue(transformInlineConstants(member.getValue()));
}
}
}
return exp;
}
private void checkAnnotationMemberValue(Expression newValue) {
if (newValue instanceof PropertyExpression) {
PropertyExpression pe = (PropertyExpression) newValue;
if (!(pe.getObjectExpression() instanceof ClassExpression)) {
addError("unable to find class '" + pe.getText() + "' for annotation attribute constant", pe.getObjectExpression());
}
} else if (newValue instanceof ListExpression) {
ListExpression le = (ListExpression) newValue;
for (Expression e : le.getExpressions()) {
checkAnnotationMemberValue(e);
}
}
}
public void visitClass(ClassNode node) {
ClassNode oldNode = currentClass;
Map<String, GenericsType> oldPNames = genericParameterNames;
genericParameterNames = new HashMap<String, GenericsType>(genericParameterNames);
currentClass = node;
resolveGenericsHeader(node.getGenericsTypes());
ModuleNode module = node.getModule();
if (!module.hasImportsResolved()) {
for (ImportNode importNode : module.getImports()) {
currImportNode = importNode;
ClassNode type = importNode.getType();
if (resolve(type, false, false, true)) {
currImportNode = null;
continue;
}
currImportNode = null;
addError("unable to resolve class " + type.getName(), type);
}
for (ImportNode importNode : module.getStaticStarImports().values()) {
ClassNode type = importNode.getType();
if (resolve(type, false, false, true)) continue;
// Maybe this type belongs in the same package as the node that is doing the
// static import. In that case, the package may not have been explicitly specified.
// Try with the node's package too. If still not found, revert to original type name.
if (type.getPackageName() == null && node.getPackageName() != null) {
String oldTypeName = type.getName();
type.setName(node.getPackageName() + "." + oldTypeName);
if (resolve(type, false, false, true)) continue;
type.setName(oldTypeName);
}
addError("unable to resolve class " + type.getName(), type);
}
for (ImportNode importNode : module.getStaticImports().values()) {
ClassNode type = importNode.getType();
if (resolve(type, true, true, true)) continue;
addError("unable to resolve class " + type.getName(), type);
}
for (ImportNode importNode : module.getStaticStarImports().values()) {
ClassNode type = importNode.getType();
if (resolve(type, true, true, true)) continue;
addError("unable to resolve class " + type.getName(), type);
}
module.setImportsResolved(true);
}
ClassNode sn = node.getUnresolvedSuperClass();
if (sn != null) resolveOrFail(sn, node, true);
for (ClassNode anInterface : node.getInterfaces()) {
resolveOrFail(anInterface, node, true);
}
checkCyclicInheritence(node, node.getUnresolvedSuperClass(), node.getInterfaces());
super.visitClass(node);
genericParameterNames = oldPNames;
currentClass = oldNode;
}
private void checkCyclicInheritence(ClassNode originalNode, ClassNode parentToCompare, ClassNode[] interfacesToCompare) {
if(!originalNode.isInterface()) {
if(parentToCompare == null) return;
if(originalNode == parentToCompare.redirect()) {
addError("Cyclic inheritance involving " + parentToCompare.getName() + " in class " + originalNode.getName(), originalNode);
return;
}
if(interfacesToCompare != null && interfacesToCompare.length > 0) {
for(ClassNode intfToCompare : interfacesToCompare) {
if(originalNode == intfToCompare.redirect()) {
addError("Cycle detected: the type " + originalNode.getName() + " cannot implement itself" , originalNode);
return;
}
}
}
if(parentToCompare == ClassHelper.OBJECT_TYPE) return;
checkCyclicInheritence(originalNode, parentToCompare.getUnresolvedSuperClass(), null);
} else {
if(interfacesToCompare != null && interfacesToCompare.length > 0) {
// check interfaces at this level first
for(ClassNode intfToCompare : interfacesToCompare) {
if(originalNode == intfToCompare.redirect()) {
addError("Cyclic inheritance involving " + intfToCompare.getName() + " in interface " + originalNode.getName(), originalNode);
return;
}
}
// check next level of interfaces
for(ClassNode intf : interfacesToCompare) {
checkCyclicInheritence(originalNode, null, intf.getInterfaces());
}
} else {
return;
}
}
}
public void visitCatchStatement(CatchStatement cs) {
resolveOrFail(cs.getExceptionType(), cs);
if (cs.getExceptionType() == ClassHelper.DYNAMIC_TYPE) {
cs.getVariable().setType(ClassHelper.make(Exception.class));
}
super.visitCatchStatement(cs);
}
public void visitForLoop(ForStatement forLoop) {
resolveOrFail(forLoop.getVariableType(), forLoop);
super.visitForLoop(forLoop);
}
public void visitBlockStatement(BlockStatement block) {
VariableScope oldScope = currentScope;
currentScope = block.getVariableScope();
super.visitBlockStatement(block);
currentScope = oldScope;
}
protected SourceUnit getSourceUnit() {
return source;
}
private void resolveGenericsTypes(GenericsType[] types) {
if (types == null) return;
currentClass.setUsingGenerics(true);
for (GenericsType type : types) {
resolveGenericsType(type);
}
}
private void resolveGenericsHeader(GenericsType[] types) {
if (types == null) return;
currentClass.setUsingGenerics(true);
for (GenericsType type : types) {
ClassNode classNode = type.getType();
String name = type.getName();
ClassNode[] bounds = type.getUpperBounds();
if (bounds != null) {
boolean nameAdded = false;
for (ClassNode upperBound : bounds) {
if (!nameAdded && upperBound != null || !resolve(classNode)) {
genericParameterNames.put(name, type);
type.setPlaceholder(true);
classNode.setRedirect(upperBound);
nameAdded = true;
}
resolveOrFail(upperBound, classNode);
}
} else {
genericParameterNames.put(name, type);
classNode.setRedirect(ClassHelper.OBJECT_TYPE);
type.setPlaceholder(true);
}
}
}
private void resolveGenericsType(GenericsType genericsType) {
if (genericsType.isResolved()) return;
currentClass.setUsingGenerics(true);
ClassNode type = genericsType.getType();
// save name before redirect
String name = type.getName();
ClassNode[] bounds = genericsType.getUpperBounds();
if (!genericParameterNames.containsKey(name)) {
if (bounds != null) {
for (ClassNode upperBound : bounds) {
resolveOrFail(upperBound, genericsType);
type.setRedirect(upperBound);
resolveGenericsTypes(upperBound.getGenericsTypes());
}
} else if (genericsType.isWildcard()) {
type.setRedirect(ClassHelper.OBJECT_TYPE);
} else {
resolveOrFail(type, genericsType);
}
} else {
GenericsType gt = genericParameterNames.get(name);
type.setRedirect(gt.getType());
genericsType.setPlaceholder(true);
}
if (genericsType.getLowerBound() != null) {
resolveOrFail(genericsType.getLowerBound(), genericsType);
}
resolveGenericsTypes(type.getGenericsTypes());
genericsType.setResolved(genericsType.getType().isResolved());
}
}
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