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#include "use.h"
namespace NSQLComplete {
namespace {
class TVisitor: public SQLv1Antlr4BaseVisitor {
public:
TVisitor(antlr4::TokenStream* tokens, size_t cursorPosition)
: Tokens_(tokens)
, CursorPosition_(cursorPosition)
{
}
std::any visitSql_stmt_core(SQLv1::Sql_stmt_coreContext* ctx) override {
if (ctx->use_stmt() || IsEnclosing(ctx)) {
return visitChildren(ctx);
}
return {};
}
std::any visitUse_stmt(SQLv1::Use_stmtContext* ctx) override {
SQLv1::Cluster_exprContext* expr = ctx->cluster_expr();
if (!expr) {
return {};
}
std::string provider;
std::string cluster;
if (SQLv1::An_idContext* ctx = expr->an_id()) {
provider = ctx->getText();
}
if (SQLv1::Pure_column_or_namedContext* ctx = expr->pure_column_or_named()) {
cluster = ctx->getText();
}
if (cluster.empty()) {
return {};
}
return TUseContext{
.Provider = std::move(provider),
.Cluster = std::move(cluster),
};
}
std::any aggregateResult(std::any aggregate, std::any nextResult) override {
if (nextResult.has_value()) {
return nextResult;
}
return aggregate;
}
bool shouldVisitNextChild(antlr4::tree::ParseTree* node, const std::any& /*currentResult*/) override {
return TextInterval(node).a < static_cast<ssize_t>(CursorPosition_);
}
private:
bool IsEnclosing(antlr4::tree::ParseTree* tree) const {
return TextInterval(tree).properlyContains(CursorInterval());
}
antlr4::misc::Interval TextInterval(antlr4::tree::ParseTree* tree) const {
auto tokens = tree->getSourceInterval();
if (tokens.b == -1) {
tokens.b = tokens.a;
}
return antlr4::misc::Interval(
Tokens_->get(tokens.a)->getStartIndex(),
Tokens_->get(tokens.b)->getStopIndex());
}
antlr4::misc::Interval CursorInterval() const {
return antlr4::misc::Interval(CursorPosition_, CursorPosition_);
}
antlr4::TokenStream* Tokens_;
size_t CursorPosition_;
};
} // namespace
TMaybe<TUseContext> FindUseStatement(
SQLv1::Sql_queryContext* ctx,
antlr4::TokenStream* tokens,
size_t cursorPosition) {
std::any result = TVisitor(tokens, cursorPosition).visit(ctx);
if (!result.has_value()) {
return Nothing();
}
return std::any_cast<TUseContext>(result);
}
} // namespace NSQLComplete
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