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#include "evaluate.h"
#include <yql/essentials/sql/v1/complete/syntax/format.h>
#include <contrib/libs/re2/re2/re2.h>
#include <util/generic/hash_set.h>
#include <util/generic/scope.h>
namespace NSQLComplete {
namespace {
class TVisitor: public SQLv1Antlr4BaseVisitor {
public:
explicit TVisitor(const TNamedNodes* nodes)
: Nodes_(nodes)
{
}
std::any visitCluster_expr(SQLv1::Cluster_exprContext* ctx) override {
if (auto* x = ctx->pure_column_or_named()) {
return visit(x);
}
return defaultResult();
}
std::any visitTable_key(SQLv1::Table_keyContext* ctx) override {
if (auto* x = ctx->id_table_or_type()) {
return visit(x);
}
return defaultResult();
}
std::any visitUnary_casual_subexpr(SQLv1::Unary_casual_subexprContext* ctx) override {
TPartialValue prev;
if (auto* x = ctx->id_expr()) {
prev = std::any_cast<TPartialValue>(visit(x));
} else if (auto* x = ctx->atom_expr()) {
prev = std::any_cast<TPartialValue>(visit(x));
}
auto next = std::any_cast<TPartialValue>(visit(ctx->unary_subexpr_suffix()));
if (!IsDefined(next)) {
return prev;
}
return defaultResult();
}
std::any visitMul_subexpr(SQLv1::Mul_subexprContext* ctx) override {
auto args = ctx->con_subexpr();
Y_ENSURE(!args.empty());
if (args.size() == 1) {
return visit(args[0]);
}
NYT::TNode result;
for (auto* arg : args) {
if (!arg) {
return defaultResult();
}
auto value = std::any_cast<TPartialValue>(visit(arg));
if (!std::holds_alternative<NYT::TNode>(value)) {
return defaultResult();
}
auto node = std::get<NYT::TNode>(value);
auto maybe = Concat(std::move(result), std::move(node));
if (!maybe) {
return defaultResult();
}
result = std::move(*maybe);
}
return TPartialValue(std::move(result));
}
std::any visitTerminal(antlr4::tree::TerminalNode* node) override {
switch (node->getSymbol()->getType()) {
case SQLv1::TOKEN_ID_QUOTED:
return TPartialValue(TString(Unquoted(GetText(node))));
case SQLv1::TOKEN_ID_PLAIN:
return TPartialValue(GetText(node));
case SQLv1::TOKEN_STRING_VALUE:
if (auto content = GetContent(node)) {
return TPartialValue(NYT::TNode(std::move(*content)));
}
}
return defaultResult();
}
std::any visitBind_parameter(SQLv1::Bind_parameterContext* ctx) override {
TMaybe<std::string> id = GetName(ctx);
if (id.Empty()) {
return defaultResult();
}
return EvaluateNode(std::move(*id));
}
protected:
std::any defaultResult() override {
return TPartialValue(std::monostate());
}
private:
TPartialValue EvaluateNode(std::string name) {
const TNamedNode* node = Nodes_->FindPtr(name);
if (!node) {
return std::monostate();
}
if (std::holds_alternative<NYT::TNode>(*node)) {
return std::get<NYT::TNode>(*node);
}
if (std::holds_alternative<SQLv1::ExprContext*>(*node)) {
if (Resolving_.contains(name)) {
return std::monostate();
}
Resolving_.emplace(name);
Y_DEFER {
Resolving_.erase(name);
};
std::any any = visit(std::get<SQLv1::ExprContext*>(*node));
return std::any_cast<TPartialValue>(std::move(any));
}
return std::monostate();
}
TMaybe<NYT::TNode> Concat(NYT::TNode lhs, NYT::TNode rhs) {
if (!lhs.HasValue()) {
return rhs;
}
NYT::TNode::EType type = rhs.GetType();
if (type != lhs.GetType()) {
return Nothing();
}
switch (type) {
case NYT::TNode::String:
return lhs.AsString() + rhs.AsString();
case NYT::TNode::Int64:
case NYT::TNode::Uint64:
case NYT::TNode::Double:
case NYT::TNode::Bool:
case NYT::TNode::List:
case NYT::TNode::Map:
case NYT::TNode::Undefined:
case NYT::TNode::Null:
return Nothing();
}
}
TIdentifier GetText(antlr4::tree::ParseTree* tree) const {
return TIdentifier(tree->getText());
}
TMaybe<TString> GetContent(antlr4::tree::TerminalNode* node) const {
static RE2 regex(R"re(["']([^"'\\]*)["'])re");
TString text = GetText(node);
TString content;
if (!RE2::FullMatch(text, regex, &content)) {
return Nothing();
}
return content;
}
THashSet<std::string> Resolving_;
const TNamedNodes* Nodes_;
};
TPartialValue EvaluateG(antlr4::ParserRuleContext* ctx, const TNamedNodes& nodes) {
return std::any_cast<TPartialValue>(TVisitor(&nodes).visit(ctx));
}
} // namespace
bool IsDefined(const TPartialValue& value) {
return !std::holds_alternative<std::monostate>(value);
}
TMaybe<TString> ToObjectRef(const TPartialValue& value) {
return std::visit([](const auto& value) -> TMaybe<TString> {
using T = std::decay_t<decltype(value)>;
if constexpr (std::is_same_v<T, NYT::TNode>) {
if (!value.IsString()) {
return Nothing();
}
return value.AsString();
} else if constexpr (std::is_same_v<T, TIdentifier>) {
return value;
} else if constexpr (std::is_same_v<T, std::monostate>) {
return Nothing();
} else {
static_assert(false);
}
}, value);
}
NYT::TNode Evaluate(SQLv1::Bind_parameterContext* ctx, const TNamedNodes& nodes) {
TPartialValue value = EvaluateG(ctx, nodes);
if (std::holds_alternative<NYT::TNode>(value)) {
return std::get<NYT::TNode>(value);
}
return NYT::TNode();
}
TPartialValue PartiallyEvaluate(antlr4::ParserRuleContext* ctx, const TNamedNodes& nodes) {
return EvaluateG(ctx, nodes);
}
} // namespace NSQLComplete
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