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#include "column.h"
#include "narrowing_visitor.h"
#include <yql/essentials/sql/v1/complete/syntax/format.h>
namespace NSQLComplete {
namespace {
// TODO: Extract it to `identifier.cpp` and reuse it also at `use.cpp`
// and replace `GetId` at `parse_tree.cpp`.
class TIdentifierVisitor: public SQLv1Antlr4BaseVisitor {
public:
std::any visitCluster_expr(SQLv1::Cluster_exprContext* ctx) override {
if (auto* x = ctx->pure_column_or_named()) {
return visit(x);
}
return {};
}
std::any visitTable_key(SQLv1::Table_keyContext* ctx) override {
if (auto* x = ctx->id_table_or_type()) {
return visit(x);
}
return {};
}
std::any visitTerminal(antlr4::tree::TerminalNode* node) override {
TString text = GetText(node);
switch (node->getSymbol()->getType()) {
case SQLv1::TOKEN_ID_QUOTED: {
text = Unquoted(std::move(text));
} break;
}
return text;
}
private:
TString GetText(antlr4::tree::ParseTree* tree) const {
return TString(tree->getText());
}
};
TMaybe<TString> GetId(antlr4::ParserRuleContext* ctx) {
if (ctx == nullptr) {
return Nothing();
}
std::any result = TIdentifierVisitor().visit(ctx);
if (!result.has_value()) {
return Nothing();
}
return std::any_cast<TString>(result);
}
class TInferenceVisitor: public SQLv1Antlr4BaseVisitor {
public:
std::any visitNamed_single_source(SQLv1::Named_single_sourceContext* ctx) override {
SQLv1::Single_sourceContext* singleSource = ctx->single_source();
if (singleSource == nullptr) {
return {};
}
std::any any = visit(singleSource);
if (!any.has_value()) {
return {};
}
TColumnContext context = std::move(std::any_cast<TColumnContext>(any));
TMaybe<TString> alias = GetAlias(ctx);
if (alias.Empty()) {
return context;
}
return Renamed(std::move(context), *alias);
}
std::any visitTable_ref(SQLv1::Table_refContext* ctx) override {
TString cluster = GetId(ctx->cluster_expr()).GetOrElse("");
TMaybe<TString> path = GetId(ctx->table_key());
if (path.Empty()) {
return {};
}
return TColumnContext{
.Tables = {
TTableId{std::move(cluster), std::move(*path)},
},
};
}
private:
TMaybe<TString> GetAlias(SQLv1::Named_single_sourceContext* ctx) const {
TMaybe<TString> alias = GetId(ctx->an_id());
alias = alias.Defined() ? alias : GetId(ctx->an_id_as_compat());
return alias;
}
TColumnContext Renamed(TColumnContext context, TString alias) {
Y_ENSURE(!alias.empty());
for (TAliased<TTableId>& table : context.Tables) {
table.Alias = alias;
}
return context;
}
};
class TVisitor: public TSQLv1NarrowingVisitor {
public:
TVisitor(antlr4::TokenStream* tokens, size_t cursorPosition)
: TSQLv1NarrowingVisitor(tokens, cursorPosition)
{
}
std::any visitSql_stmt_core(SQLv1::Sql_stmt_coreContext* ctx) override {
if (IsEnclosing(ctx)) {
return visitChildren(ctx);
}
return {};
}
std::any visitSelect_core(SQLv1::Select_coreContext* ctx) override {
SQLv1::Join_sourceContext* source = ctx->join_source(0);
if (source == nullptr) {
source = ctx->join_source(1);
}
if (source == nullptr) {
return {};
}
return TInferenceVisitor().visit(ctx);
}
};
} // namespace
TMaybe<TColumnContext> InferColumnContext(
SQLv1::Sql_queryContext* ctx,
antlr4::TokenStream* tokens,
size_t cursorPosition) {
// TODO: add utility `auto ToMaybe<T>(std::any any) -> TMaybe<T>`
std::any result = TVisitor(tokens, cursorPosition).visit(ctx);
if (!result.has_value()) {
return Nothing();
}
return std::any_cast<TColumnContext>(result);
}
} // namespace NSQLComplete
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