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#include "sql_complete.h"
#include <yql/essentials/sql/v1/complete/text/word.h>
#include <yql/essentials/sql/v1/complete/name/static/name_service.h>
#include <yql/essentials/sql/v1/complete/syntax/local.h>
// FIXME(YQL-19747): unwanted dependency on a lexer implementation
#include <yql/essentials/sql/v1/lexer/antlr4_pure/lexer.h>
#include <yql/essentials/sql/v1/lexer/antlr4_pure_ansi/lexer.h>
#include <util/generic/algorithm.h>
#include <util/charset/utf8.h>
namespace NSQLComplete {
class TSqlCompletionEngine: public ISqlCompletionEngine {
public:
explicit TSqlCompletionEngine(
TLexerSupplier lexer,
INameService::TPtr names,
ISqlCompletionEngine::TConfiguration configuration)
: Configuration(std::move(configuration))
, SyntaxAnalysis(MakeLocalSyntaxAnalysis(lexer))
, Names(std::move(names))
{
}
TCompletion Complete(TCompletionInput input) {
auto prefix = input.Text.Head(input.CursorPosition);
auto completedToken = GetCompletedToken(prefix);
auto context = SyntaxAnalysis->Analyze(input);
TVector<TCandidate> candidates;
EnrichWithKeywords(candidates, std::move(context.Keywords), completedToken);
EnrichWithNames(candidates, context, completedToken);
return {
.CompletedToken = std::move(completedToken),
.Candidates = std::move(candidates),
};
}
private:
TCompletedToken GetCompletedToken(TStringBuf prefix) {
return {
.Content = LastWord(prefix),
.SourcePosition = LastWordIndex(prefix),
};
}
void EnrichWithKeywords(
TVector<TCandidate>& candidates,
TVector<TString> keywords,
const TCompletedToken& prefix) {
for (auto keyword : keywords) {
candidates.push_back({
.Kind = ECandidateKind::Keyword,
.Content = std::move(keyword),
});
}
FilterByContent(candidates, prefix.Content);
candidates.crop(Configuration.Limit);
}
void EnrichWithNames(
TVector<TCandidate>& candidates,
const TLocalSyntaxContext& context,
const TCompletedToken& prefix) {
if (candidates.size() == Configuration.Limit) {
return;
}
TNameRequest request = {
.Prefix = TString(prefix.Content),
.Limit = Configuration.Limit - candidates.size(),
};
if (context.IsTypeName) {
request.Constraints.TypeName = TTypeName::TConstraints();
}
if (context.IsFunctionName) {
request.Constraints.Function = TFunctionName::TConstraints();
}
if (request.IsEmpty()) {
return;
}
// User should prepare a robust INameService
TNameResponse response = Names->Lookup(std::move(request)).ExtractValueSync();
EnrichWithNames(candidates, std::move(response.RankedNames));
}
void EnrichWithNames(TVector<TCandidate>& candidates, TVector<TGenericName> names) {
for (auto& name : names) {
candidates.emplace_back(std::visit([](auto&& name) -> TCandidate {
using T = std::decay_t<decltype(name)>;
if constexpr (std::is_base_of_v<TTypeName, T>) {
return {ECandidateKind::TypeName, std::move(name.Indentifier)};
}
if constexpr (std::is_base_of_v<TFunctionName, T>) {
name.Indentifier += "(";
return {ECandidateKind::FunctionName, std::move(name.Indentifier)};
}
}, std::move(name)));
}
}
void FilterByContent(TVector<TCandidate>& candidates, TStringBuf prefix) {
const auto lowerPrefix = ToLowerUTF8(prefix);
auto removed = std::ranges::remove_if(candidates, [&](const auto& candidate) {
return !ToLowerUTF8(candidate.Content).StartsWith(lowerPrefix);
});
candidates.erase(std::begin(removed), std::end(removed));
}
TConfiguration Configuration;
ILocalSyntaxAnalysis::TPtr SyntaxAnalysis;
INameService::TPtr Names;
};
// FIXME(YQL-19747): unwanted dependency on a lexer implementation
ISqlCompletionEngine::TPtr MakeSqlCompletionEngine() {
NSQLTranslationV1::TLexers lexers;
lexers.Antlr4Pure = NSQLTranslationV1::MakeAntlr4PureLexerFactory();
lexers.Antlr4PureAnsi = NSQLTranslationV1::MakeAntlr4PureAnsiLexerFactory();
INameService::TPtr names = MakeStaticNameService(MakeDefaultNameSet(), MakeDefaultRanking());
return MakeSqlCompletionEngine([lexers = std::move(lexers)](bool ansi) {
return NSQLTranslationV1::MakeLexer(
lexers, ansi, /* antlr4 = */ true,
NSQLTranslationV1::ELexerFlavor::Pure);
}, std::move(names));
}
ISqlCompletionEngine::TPtr MakeSqlCompletionEngine(
TLexerSupplier lexer,
INameService::TPtr names,
ISqlCompletionEngine::TConfiguration configuration) {
return ISqlCompletionEngine::TPtr(
new TSqlCompletionEngine(lexer, std::move(names), std::move(configuration)));
}
} // namespace NSQLComplete
template <>
void Out<NSQLComplete::ECandidateKind>(IOutputStream& out, NSQLComplete::ECandidateKind kind) {
switch (kind) {
case NSQLComplete::ECandidateKind::Keyword:
out << "Keyword";
break;
case NSQLComplete::ECandidateKind::TypeName:
out << "TypeName";
break;
case NSQLComplete::ECandidateKind::FunctionName:
out << "FunctionName";
break;
}
}
template <>
void Out<NSQLComplete::TCandidate>(IOutputStream& out, const NSQLComplete::TCandidate& candidate) {
out << "{" << candidate.Kind << ", \"" << candidate.Content << "\"}";
}
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