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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/sql/v1/complete/antlr4/vocabulary.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 <std::regular_invocable<TParserCallStack> StackPredicate>
std::regular_invocable<TMatchedRule> auto RuleAdapted(StackPredicate predicate) {
return [=](const TMatchedRule& rule) {
return predicate(rule.ParserCallStack);
};
}
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);
NSQLTranslation::TParsedTokenList tokens = Tokenized(prefix);
return {
.Keywords = SiftedKeywords(candidates),
.Pragma = PragmaMatch(tokens, candidates),
.IsTypeName = IsTypeNameMatched(candidates),
.Function = FunctionMatch(tokens, candidates),
.Hint = HintMatch(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;
}
TLocalSyntaxContext::TKeywords SiftedKeywords(const TC3Candidates& candidates) {
const auto& vocabulary = Grammar->GetVocabulary();
const auto& keywordTokens = Grammar->GetKeywordTokens();
TLocalSyntaxContext::TKeywords keywords;
for (const auto& token : candidates.Tokens) {
if (keywordTokens.contains(token.Number)) {
auto& following = keywords[Display(vocabulary, token.Number)];
for (auto next : token.Following) {
following.emplace_back(Display(vocabulary, next));
}
}
}
return keywords;
}
std::optional<TLocalSyntaxContext::TPragma> PragmaMatch(
const NSQLTranslation::TParsedTokenList& tokens, const TC3Candidates& candidates) {
if (!AnyOf(candidates.Rules, RuleAdapted(IsLikelyPragmaStack))) {
return std::nullopt;
}
TLocalSyntaxContext::TPragma pragma;
if (EndsWith(tokens, {"ID_PLAIN", "DOT"})) {
pragma.Namespace = tokens[tokens.size() - 2].Content;
} else if (EndsWith(tokens, {"ID_PLAIN", "DOT", ""})) {
pragma.Namespace = tokens[tokens.size() - 3].Content;
}
return pragma;
}
bool IsTypeNameMatched(const TC3Candidates& candidates) {
return AnyOf(candidates.Rules, RuleAdapted(IsLikelyTypeStack));
}
std::optional<TLocalSyntaxContext::TFunction> FunctionMatch(
const NSQLTranslation::TParsedTokenList& tokens, const TC3Candidates& candidates) {
if (!AnyOf(candidates.Rules, RuleAdapted(IsLikelyFunctionStack))) {
return std::nullopt;
}
TLocalSyntaxContext::TFunction function;
if (EndsWith(tokens, {"ID_PLAIN", "NAMESPACE"})) {
function.Namespace = tokens[tokens.size() - 2].Content;
} else if (EndsWith(tokens, {"ID_PLAIN", "NAMESPACE", ""})) {
function.Namespace = tokens[tokens.size() - 3].Content;
}
return function;
}
std::optional<TLocalSyntaxContext::THint> HintMatch(const TC3Candidates& candidates) {
// TODO(YQL-19747): detect local contexts with a single iteration through the candidates.Rules
auto rule = FindIf(candidates.Rules, RuleAdapted(IsLikelyHintStack));
if (rule == std::end(candidates.Rules)) {
return std::nullopt;
}
auto stmt = StatementKindOf(rule->ParserCallStack);
if (stmt == std::nullopt) {
return std::nullopt;
}
return TLocalSyntaxContext::THint{
.StatementKind = *stmt,
};
}
NSQLTranslation::TParsedTokenList Tokenized(const TStringBuf text) {
NSQLTranslation::TParsedTokenList tokens;
NYql::TIssues issues;
if (!NSQLTranslation::Tokenize(
*Lexer_, TString(text), /* queryName = */ "",
tokens, issues, /* maxErrors = */ 0)) {
return {};
}
Y_ENSURE(!tokens.empty() && tokens.back().Name == "EOF");
tokens.pop_back();
return tokens;
}
bool EndsWith(
const NSQLTranslation::TParsedTokenList& tokens,
const TVector<TStringBuf>& pattern) {
if (tokens.size() < pattern.size()) {
return false;
}
for (yssize_t i = tokens.ysize() - 1, j = pattern.ysize() - 1; 0 <= j; --i, --j) {
if (!pattern[j].empty() && tokens[i].Name != pattern[j]) {
return false;
}
}
return true;
}
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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