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#include "local.h"
#include "ansi.h"
#include "parser_call_stack.h"
#include "grammar.h"
#include <yql/essentials/sql/v1/complete/antlr4/c3i.h>
#include <yql/essentials/sql/v1/complete/antlr4/c3t.h>
#include <yql/essentials/core/issue/yql_issue.h>
#include <util/generic/algorithm.h>
#include <util/stream/output.h>
#ifdef TOKEN_QUERY // Conflict with the winnt.h
#undef TOKEN_QUERY
#endif
#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>
namespace NSQLComplete {
template <bool IsAnsiLexer>
class TSpecializedLocalSyntaxAnalysis: public ILocalSyntaxAnalysis {
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 TSpecializedLocalSyntaxAnalysis(TLexerSupplier lexer)
: Grammar(&GetSqlGrammar())
, Lexer_(lexer(/* ansi = */ IsAnsiLexer))
, C3(ComputeC3Config())
{
}
TLocalSyntaxContext Analyze(TCompletionInput input) override {
TStringBuf prefix;
if (!GetC3Prefix(input, &prefix)) {
return {};
}
auto candidates = C3.Complete(prefix);
return {
.Keywords = SiftedKeywords(candidates),
.IsTypeName = IsTypeNameMatched(candidates),
.IsFunctionName = IsFunctionNameMatched(candidates),
};
}
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);
}
for (auto punctuationToken : Grammar->GetPunctuationTokens()) {
ignoredTokens.erase(punctuationToken);
}
return ignoredTokens;
}
std::unordered_set<TRuleId> ComputePreferredRules() {
return GetC3PreferredRules();
}
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 TC3Candidates& candidates) {
const auto& vocabulary = Grammar->GetVocabulary();
const auto& keywordTokens = Grammar->GetKeywordTokens();
TVector<TString> keywords;
for (const auto& token : candidates.Tokens) {
if (keywordTokens.contains(token.Number)) {
keywords.emplace_back(Display(vocabulary, token.Number));
for (auto following : token.Following) {
if (keywordTokens.contains(following)) {
keywords.back() += " ";
}
keywords.back() += Display(vocabulary, following);
}
}
}
return keywords;
}
std::string Display(const antlr4::dfa::Vocabulary& vocabulary, TTokenId tokenType) {
auto name = vocabulary.getDisplayName(tokenType);
if (2 <= name.length() && name.starts_with('\'') && name.ends_with('\'')) {
name.erase(static_cast<std::string::size_type>(0), 1);
name.pop_back();
}
return name;
}
bool IsTypeNameMatched(const TC3Candidates& candidates) {
return AnyOf(candidates.Rules, [&](const TMatchedRule& rule) {
return IsLikelyTypeStack(rule.ParserCallStack);
});
}
bool IsFunctionNameMatched(const TC3Candidates& candidates) {
return AnyOf(candidates.Rules, [&](const TMatchedRule& rule) {
return IsLikelyFunctionStack(rule.ParserCallStack);
});
}
const ISqlGrammar* Grammar;
NSQLTranslation::ILexer::TPtr Lexer_;
TC3Engine<G> C3;
};
class TLocalSyntaxAnalysis: public ILocalSyntaxAnalysis {
public:
explicit TLocalSyntaxAnalysis(TLexerSupplier lexer)
: DefaultEngine(lexer)
, AnsiEngine(lexer)
{
}
TLocalSyntaxContext Analyze(TCompletionInput input) override {
auto isAnsiLexer = IsAnsiQuery(TString(input.Text));
auto& engine = GetSpecializedEngine(isAnsiLexer);
return engine.Analyze(std::move(input));
}
private:
ILocalSyntaxAnalysis& GetSpecializedEngine(bool isAnsiLexer) {
if (isAnsiLexer) {
return AnsiEngine;
}
return DefaultEngine;
}
TSpecializedLocalSyntaxAnalysis</* IsAnsiLexer = */ false> DefaultEngine;
TSpecializedLocalSyntaxAnalysis</* IsAnsiLexer = */ true> AnsiEngine;
};
ILocalSyntaxAnalysis::TPtr MakeLocalSyntaxAnalysis(TLexerSupplier lexer) {
return TLocalSyntaxAnalysis::TPtr(new TLocalSyntaxAnalysis(lexer));
}
} // namespace NSQLComplete
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