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package processing.mode.java;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ASTVisitor;
import org.eclipse.jdt.core.dom.ClassInstanceCreation;
import org.eclipse.jdt.core.dom.IBinding;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.Name;
import org.eclipse.jdt.core.dom.NodeFinder;
import org.eclipse.jdt.core.dom.SimpleName;
import org.eclipse.jdt.core.dom.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.IntStream;
import processing.app.Messages;
public class ASTUtils {
public static ASTNode getASTNodeAt(ASTNode root, int startJavaOffset, int stopJavaOffset) {
Messages.log("* getASTNodeAt");
int length = stopJavaOffset - startJavaOffset;
NodeFinder f = new NodeFinder(root, startJavaOffset, length);
ASTNode node = f.getCoveredNode();
if (node == null) {
node = f.getCoveringNode();
}
if (node == null) {
Messages.log("no node found");
} else {
Messages.log("found " + node.getClass().getSimpleName());
}
return node;
}
public static SimpleName getSimpleNameAt(ASTNode root, int startJavaOffset, int stopJavaOffset) {
Messages.log("* getSimpleNameAt");
// Find node at offset
ASTNode node = getASTNodeAt(root, startJavaOffset, stopJavaOffset);
SimpleName result = null;
if (node != null) {
if (node.getNodeType() == ASTNode.SIMPLE_NAME) {
result = (SimpleName) node;
} else {
// Return SimpleName with highest coverage
List<SimpleName> simpleNames = getSimpleNameChildren(node);
if (!simpleNames.isEmpty()) {
// Compute coverage <selection x node>
int[] coverages = simpleNames.stream()
.mapToInt(name -> {
int start = name.getStartPosition();
int stop = start + name.getLength();
return Math.min(stop, stopJavaOffset) -
Math.max(startJavaOffset, start);
})
.toArray();
// Select node with highest coverage
int maxIndex = IntStream.range(0, simpleNames.size())
.filter(i -> coverages[i] >= 0)
.reduce((i, j) -> coverages[i] > coverages[j] ? i : j)
.orElse(-1);
if (maxIndex == -1) return null;
result = simpleNames.get(maxIndex);
}
}
}
if (result == null) {
Messages.log("no simple name found");
} else {
Messages.log("found " + node);
}
return result;
}
public static List<SimpleName> getSimpleNameChildren(ASTNode node) {
List<SimpleName> simpleNames = new ArrayList<>();
node.accept(new ASTVisitor() {
@Override
public boolean visit(SimpleName simpleName) {
simpleNames.add(simpleName);
return super.visit(simpleName);
}
});
return simpleNames;
}
public static IBinding resolveBinding(SimpleName node) {
IBinding binding = node.resolveBinding();
if (binding == null) return null;
// Fix constructor call/declaration being resolved as type
if (binding.getKind() == IBinding.TYPE) {
ASTNode context = node;
// Go up until we find non Name or Type node
// stop if context is type argument (parent is also Name/Type, but unrelated)
while (isNameOrType(context) &&
!context.getLocationInParent().getId().equals("typeArguments")) {
context = context.getParent();
}
switch (context.getNodeType()) {
case ASTNode.METHOD_DECLARATION:
MethodDeclaration decl = (MethodDeclaration) context;
if (decl.isConstructor()) {
binding = decl.resolveBinding();
}
break;
case ASTNode.CLASS_INSTANCE_CREATION:
ClassInstanceCreation cic = (ClassInstanceCreation) context;
binding = cic.resolveConstructorBinding();
break;
}
}
if (binding == null) return null;
// Normalize parametrized and raw bindings into generic bindings
switch (binding.getKind()) {
case IBinding.TYPE:
ITypeBinding type = (ITypeBinding) binding;
if (type.isParameterizedType() || type.isRawType()) {
binding = type.getErasure();
}
break;
case IBinding.METHOD:
IMethodBinding method = (IMethodBinding) binding;
ITypeBinding declaringClass = method.getDeclaringClass();
if (declaringClass.isParameterizedType() ||
declaringClass.isRawType()) {
IMethodBinding[] methods = declaringClass.getErasure().getDeclaredMethods();
IMethodBinding generic = Arrays.stream(methods)
.filter(method::overrides)
.findAny().orElse(null);
if (generic != null) method = generic;
}
if (method.isParameterizedMethod() || method.isRawMethod()) {
method = method.getMethodDeclaration();
}
binding = method;
break;
}
return binding;
}
public static boolean isNameOrType(ASTNode node) {
return node instanceof Name || node instanceof Type;
}
public static List<SimpleName> findAllOccurrences(ASTNode root,
String bindingKey
) {
List<SimpleName> occurrences = new ArrayList<>();
root.getRoot().accept(new ASTVisitor() {
@Override
public boolean visit(SimpleName name) {
IBinding binding = resolveBinding(name);
if (binding != null && bindingKey.equals(binding.getKey())) {
occurrences.add(name);
}
return super.visit(name);
}
});
return occurrences;
}
}