private static boolean isFirstUnboundRead(
@NotNull PyReferenceExpression node, @NotNull ScopeOwner owner) {
final String nodeName = node.getReferencedName();
final Scope scope = ControlFlowCache.getScope(owner);
final ControlFlow flow = ControlFlowCache.getControlFlow(owner);
final Instruction[] instructions = flow.getInstructions();
final int num = ControlFlowUtil.findInstructionNumberByElement(instructions, node);
if (num < 0) {
return true;
}
final Ref<Boolean> first = Ref.create(true);
ControlFlowUtil.iteratePrev(
num,
instructions,
new Function<Instruction, ControlFlowUtil.Operation>() {
@Override
public ControlFlowUtil.Operation fun(Instruction instruction) {
if (instruction instanceof ReadWriteInstruction) {
final ReadWriteInstruction rwInstruction = (ReadWriteInstruction) instruction;
final String name = rwInstruction.getName();
final PsiElement element = rwInstruction.getElement();
if (element != null
&& name != null
&& name.equals(nodeName)
&& instruction.num() != num) {
try {
if (scope.getDeclaredVariable(element, name) == null) {
final ReadWriteInstruction.ACCESS access = rwInstruction.getAccess();
if (access.isReadAccess()) {
first.set(false);
return ControlFlowUtil.Operation.BREAK;
}
}
} catch (DFALimitExceededException e) {
first.set(false);
}
return ControlFlowUtil.Operation.CONTINUE;
}
}
return ControlFlowUtil.Operation.NEXT;
}
});
return first.get();
}
private void processElement(@NotNull final PsiNameIdentifierOwner element) {
if (isConditional(element)) {
return;
}
final String name = element.getName();
final ScopeOwner owner = ScopeUtil.getScopeOwner(element);
if (owner != null && name != null) {
final Instruction[] instructions = ControlFlowCache.getControlFlow(owner).getInstructions();
PsiElement elementInControlFlow = element;
if (element instanceof PyTargetExpression) {
final PyImportStatement importStatement =
PsiTreeUtil.getParentOfType(element, PyImportStatement.class);
if (importStatement != null) {
elementInControlFlow = importStatement;
}
}
final int startInstruction =
ControlFlowUtil.findInstructionNumberByElement(instructions, elementInControlFlow);
if (startInstruction < 0) {
return;
}
final Ref<PsiElement> readElementRef = Ref.create(null);
final Ref<PsiElement> writeElementRef = Ref.create(null);
ControlFlowUtil.iteratePrev(
startInstruction,
instructions,
new Function<Instruction, ControlFlowUtil.Operation>() {
@Override
public ControlFlowUtil.Operation fun(Instruction instruction) {
if (instruction instanceof ReadWriteInstruction
&& instruction.num() != startInstruction) {
final ReadWriteInstruction rwInstruction = (ReadWriteInstruction) instruction;
if (name.equals(rwInstruction.getName())) {
final PsiElement originalElement = rwInstruction.getElement();
if (originalElement != null) {
if (rwInstruction.getAccess().isReadAccess()) {
readElementRef.set(originalElement);
}
if (rwInstruction.getAccess().isWriteAccess()) {
if (originalElement != element) {
writeElementRef.set(originalElement);
}
}
}
return ControlFlowUtil.Operation.CONTINUE;
}
}
return ControlFlowUtil.Operation.NEXT;
}
});
final PsiElement writeElement = writeElementRef.get();
if (writeElement != null && readElementRef.get() == null) {
final List<LocalQuickFix> quickFixes = new ArrayList<LocalQuickFix>();
if (suggestRename(element, writeElement)) {
quickFixes.add(new PyRenameElementQuickFix());
}
final PsiElement identifier = element.getNameIdentifier();
registerProblem(
identifier != null ? identifier : element,
PyBundle.message("INSP.redeclared.name", name),
ProblemHighlightType.GENERIC_ERROR_OR_WARNING,
null,
quickFixes.toArray(new LocalQuickFix[quickFixes.size()]));
}
}
}