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#include "sql_context.h"
#include "c3_engine.h"
#include "sql_syntax.h"
#include <yql/essentials/core/issue/yql_issue.h>
#include <yql/essentials/parser/antlr_ast/gen/v1_antlr4/SQLv1Antlr4Lexer.h>
#include <yql/essentials/parser/antlr_ast/gen/v1_antlr4/SQLv1Antlr4Parser.h>
#include <yql/essentials/parser/antlr_ast/gen/v1_ansi_antlr4/SQLv1Antlr4Lexer.h>
#include <yql/essentials/parser/antlr_ast/gen/v1_ansi_antlr4/SQLv1Antlr4Parser.h>
#include <util/generic/algorithm.h>
#include <util/stream/output.h>
namespace NSQLComplete {
template <bool IsAnsiLexer>
class TSpecializedSqlContextInference: public ISqlContextInference {
private:
using TDefaultYQLGrammar = TAntlrGrammar<
NALADefaultAntlr4::SQLv1Antlr4Lexer,
NALADefaultAntlr4::SQLv1Antlr4Parser>;
using TAnsiYQLGrammar = TAntlrGrammar<
NALAAnsiAntlr4::SQLv1Antlr4Lexer,
NALAAnsiAntlr4::SQLv1Antlr4Parser>;
using G = std::conditional_t<
IsAnsiLexer,
TAnsiYQLGrammar,
TDefaultYQLGrammar>;
public:
explicit TSpecializedSqlContextInference(TLexerSupplier lexer)
: Grammar(&GetSqlGrammar(IsAnsiLexer))
, Lexer_(lexer(/* ansi = */ IsAnsiLexer))
, C3(ComputeC3Config())
{
}
TCompletionContext Analyze(TCompletionInput input) override {
TStringBuf prefix;
if (!GetC3Prefix(input, &prefix)) {
return {};
}
auto tokens = C3.Complete(prefix);
return {
.Keywords = SiftedKeywords(tokens),
};
}
private:
IC3Engine::TConfig ComputeC3Config() {
return {
.IgnoredTokens = ComputeIgnoredTokens(),
.PreferredRules = ComputePreferredRules(),
};
}
std::unordered_set<TTokenId> ComputeIgnoredTokens() {
auto ignoredTokens = Grammar->GetAllTokens();
for (auto keywordToken : Grammar->GetKeywordTokens()) {
ignoredTokens.erase(keywordToken);
}
return ignoredTokens;
}
std::unordered_set<TRuleId> ComputePreferredRules() {
const auto& keywordRules = Grammar->GetKeywordRules();
std::unordered_set<TRuleId> preferredRules;
// Excludes tokens obtained from keyword rules
preferredRules.insert(std::begin(keywordRules), std::end(keywordRules));
return preferredRules;
}
bool GetC3Prefix(TCompletionInput input, TStringBuf* prefix) {
*prefix = input.Text.Head(input.CursorPosition);
TVector<TString> statements;
NYql::TIssues issues;
if (!NSQLTranslationV1::SplitQueryToStatements(
TString(*prefix) + (prefix->EndsWith(';') ? ";" : ""), Lexer_,
statements, issues, /* file = */ "",
/* areBlankSkipped = */ false)) {
return false;
}
if (statements.empty()) {
return true;
}
*prefix = prefix->Last(statements.back().size());
return true;
}
TVector<TString> SiftedKeywords(const TVector<TSuggestedToken>& tokens) {
const auto& vocabulary = Grammar->GetVocabulary();
const auto& keywordTokens = Grammar->GetKeywordTokens();
TVector<TString> keywords;
for (const auto& token : tokens) {
if (keywordTokens.contains(token.Number)) {
keywords.emplace_back(vocabulary.getDisplayName(token.Number));
}
}
return keywords;
}
const ISqlGrammar* Grammar;
NSQLTranslation::ILexer::TPtr Lexer_;
TC3Engine<G> C3;
};
class TSqlContextInference: public ISqlContextInference {
public:
explicit TSqlContextInference(TLexerSupplier lexer)
: DefaultEngine(lexer)
, AnsiEngine(lexer)
{
}
TCompletionContext Analyze(TCompletionInput input) override {
auto isAnsiLexer = IsAnsiQuery(TString(input.Text));
auto& engine = GetSpecializedEngine(isAnsiLexer);
return engine.Analyze(std::move(input));
}
private:
ISqlContextInference& GetSpecializedEngine(bool isAnsiLexer) {
if (isAnsiLexer) {
return AnsiEngine;
}
return DefaultEngine;
}
TSpecializedSqlContextInference</* IsAnsiLexer = */ false> DefaultEngine;
TSpecializedSqlContextInference</* IsAnsiLexer = */ true> AnsiEngine;
};
ISqlContextInference::TPtr MakeSqlContextInference(TLexerSupplier lexer) {
return TSqlContextInference::TPtr(new TSqlContextInference(lexer));
}
} // namespace NSQLComplete
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