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#include "function.h"
#include "narrowing_visitor.h"
#include <library/cpp/iterator/enumerate.h>
namespace NSQLComplete {
namespace {
class TVisitor: public TSQLv1NarrowingVisitor {
public:
TVisitor(const TParsedInput& input)
: TSQLv1NarrowingVisitor(input)
{
}
std::any visit(antlr4::tree::ParseTree* tree) override {
if (IsEnclosing(tree)) {
return TSQLv1NarrowingVisitor::visit(tree);
}
return {};
}
std::any visitTable_ref(SQLv1::Table_refContext* ctx) override {
auto* function = ctx->an_id_expr();
auto* lparen = ctx->TOKEN_LPAREN();
if (function == nullptr || lparen == nullptr) {
return {};
}
if (CursorPosition() <= TextInterval(lparen).b) {
return {};
}
return TFunctionContext{
.Name = function->getText(),
.ArgumentNumber = ArgumentNumber(ctx).GetOrElse(0),
};
}
private:
TMaybe<size_t> ArgumentNumber(SQLv1::Table_refContext* ctx) {
for (auto [i, arg] : Enumerate(ctx->table_arg())) {
if (IsEnclosing(arg)) {
return i;
}
}
return Nothing();
}
};
} // namespace
TMaybe<TFunctionContext> EnclosingFunction(TParsedInput input) {
std::any result = TVisitor(input).visit(input.SqlQuery);
if (!result.has_value()) {
return Nothing();
}
return std::any_cast<TFunctionContext>(result);
}
} // namespace NSQLComplete
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