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#include "function.h"
#include "evaluate.h"
#include "narrowing_visitor.h"
#include "use.h"
#include <library/cpp/iterator/enumerate.h>
namespace NSQLComplete {
namespace {
class TVisitor: public TSQLv1NarrowingVisitor {
public:
TVisitor(const TParsedInput& input, const TNamedNodes* nodes)
: TSQLv1NarrowingVisitor(input)
, Nodes_(nodes)
{
}
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 {};
}
TMaybe<TFunctionContext> context = GetFunction(ctx, *Nodes_);
if (!context) {
return {};
}
const size_t argN = ArgumentNumber(ctx).GetOrElse(0);
context->ArgumentNumber = argN;
context->Arg0 = (argN != 0) ? context->Arg0 : Nothing();
context->Arg1 = (argN != 1) ? context->Arg1 : Nothing();
return *context;
}
private:
TMaybe<size_t> ArgumentNumber(SQLv1::Table_refContext* ctx) const {
for (auto [i, arg] : Enumerate(ctx->table_arg())) {
if (IsEnclosing(arg)) {
return i;
}
}
return Nothing();
}
const TNamedNodes* Nodes_;
};
TMaybe<TString> GetArgument(size_t index, SQLv1::Table_refContext* ctx, const TNamedNodes& nodes) {
auto* table_arg = ctx->table_arg(index);
if (!table_arg) {
return Nothing();
}
auto* named_expr = table_arg->named_expr();
if (!named_expr) {
return Nothing();
}
return ToObjectRef(PartiallyEvaluate(named_expr, nodes));
}
TMaybe<TClusterContext> GetCluster(SQLv1::Table_refContext* ctx, const TNamedNodes& nodes) {
auto* cluster_expr = ctx->cluster_expr();
if (!cluster_expr) {
return Nothing();
}
return ParseClusterContext(cluster_expr, nodes);
}
} // namespace
TMaybe<TFunctionContext> EnclosingFunction(TParsedInput input, const TNamedNodes& nodes) {
std::any result = TVisitor(input, &nodes).visit(input.SqlQuery);
if (!result.has_value()) {
return Nothing();
}
return std::any_cast<TFunctionContext>(result);
}
TMaybe<TFunctionContext> GetFunction(SQLv1::Table_refContext* ctx, const TNamedNodes& nodes) {
auto* function = ctx->an_id_expr();
auto* lparen = ctx->TOKEN_LPAREN();
if (function == nullptr || lparen == nullptr) {
return Nothing();
}
return TFunctionContext{
.Name = function->getText(),
.ArgumentNumber = 0,
.Arg0 = GetArgument(0, ctx, nodes),
.Arg1 = GetArgument(1, ctx, nodes),
.Cluster = GetCluster(ctx, nodes),
};
}
} // namespace NSQLComplete
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