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#include "ast.h"
#include <util/generic/stack.h>
#include <utility>
namespace NSQLFormat {
namespace {
bool IsUnstable(const NYql::TAstNode* x) {
return x->IsAtom() && (x->GetFlags() & NYql::TAstNodeFlags::UnstableFormat) != 0;
}
} // namespace
TMaybe<bool> AreAstEqual(const NYql::TAstNode* lhs, const NYql::TAstNode* rhs) {
bool isUnstable = false;
TStack<std::pair<const NYql::TAstNode*, const NYql::TAstNode*>> stack;
stack.emplace(lhs, rhs);
while (!stack.empty()) {
const auto [lhs, rhs] = std::move(stack.top());
stack.pop();
if (IsUnstable(lhs) && IsUnstable(rhs)) {
isUnstable = true;
continue;
}
if (lhs->GetType() != rhs->GetType()) {
return false;
}
switch (lhs->GetType()) {
case NYql::TAstNode::EType::Atom: {
if (lhs->GetFlags() != rhs->GetFlags()) {
return false;
}
if (lhs->GetContent() != rhs->GetContent()) {
return false;
}
break;
}
case NYql::TAstNode::EType::List: {
if (lhs->GetChildrenCount() != rhs->GetChildrenCount()) {
return false;
}
for (size_t i = 0; i < lhs->GetChildrenCount(); ++i) {
stack.emplace(lhs->GetChild(i), rhs->GetChild(i));
}
break;
}
}
}
if (isUnstable) {
return Nothing();
}
return true;
}
} // namespace NSQLFormat
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