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#pragma once
#include "c3i.h"
#include <yql/essentials/sql/v1/complete/text/word.h>
#include <contrib/libs/antlr4_cpp_runtime/src/ANTLRInputStream.h>
#include <contrib/libs/antlr4_cpp_runtime/src/BufferedTokenStream.h>
#include <contrib/libs/antlr4_cpp_runtime/src/Vocabulary.h>
#include <contrib/libs/antlr4-c3/src/CodeCompletionCore.hpp>
#include <util/generic/fwd.h>
#include <util/generic/string.h>
#include <util/generic/vector.h>
namespace NSQLComplete {
template <class Lexer, class Parser>
struct TAntlrGrammar {
using TLexer = Lexer;
using TParser = Parser;
TAntlrGrammar() = delete;
};
template <class G>
class TC3Engine: public IC3Engine {
public:
explicit TC3Engine(TConfig config)
: Chars()
, Lexer(&Chars)
, Tokens(&Lexer)
, Parser(&Tokens)
, CompletionCore(&Parser)
{
Lexer.removeErrorListeners();
Parser.removeErrorListeners();
CompletionCore.ignoredTokens = std::move(config.IgnoredTokens);
CompletionCore.preferredRules = std::move(config.PreferredRules);
}
TC3Candidates Complete(TStringBuf prefix) override {
Assign(prefix);
const auto caretTokenIndex = CaretTokenIndex(prefix);
auto candidates = CompletionCore.collectCandidates(caretTokenIndex);
return Converted(std::move(candidates));
}
private:
void Assign(TStringBuf prefix) {
Chars.load(prefix.Data(), prefix.Size(), /* lenient = */ false);
Lexer.reset();
Tokens.setTokenSource(&Lexer);
Tokens.fill();
}
size_t CaretTokenIndex(TStringBuf prefix) {
const auto tokensCount = Tokens.size();
if (2 <= tokensCount && !LastWord(prefix).Empty()) {
return tokensCount - 2;
}
return tokensCount - 1;
}
static TC3Candidates Converted(c3::CandidatesCollection candidates) {
TC3Candidates converted;
for (auto& [token, following] : candidates.tokens) {
converted.Tokens.emplace_back(token, std::move(following));
}
for (auto& [rule, data] : candidates.rules) {
converted.Rules.emplace_back(rule, std::move(data.ruleList));
converted.Rules.back().ParserCallStack.emplace_back(rule);
}
return converted;
}
antlr4::ANTLRInputStream Chars;
G::TLexer Lexer;
antlr4::BufferedTokenStream Tokens;
G::TParser Parser;
c3::CodeCompletionCore CompletionCore;
};
} // namespace NSQLComplete
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