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#include "cursor_token_context.h"
#include <yql/essentials/core/issue/yql_issue.h>
#include <yql/essentials/sql/v1/lexer/lexer.h>
namespace NSQLComplete {
namespace {
bool Tokenize(ILexer::TPtr& lexer, TCompletionInput input, TParsedTokenList& tokens) {
NYql::TIssues issues;
if (!NSQLTranslation::Tokenize(
*lexer, TString(input.Text), /* queryName = */ "",
tokens, issues, /* maxErrors = */ 1)) {
return false;
}
return true;
}
TCursor GetCursor(const TParsedTokenList& tokens, size_t cursorPosition) {
size_t current = 0;
for (size_t i = 0; i < tokens.size() && current < cursorPosition; ++i) {
const auto& content = tokens[i].Content;
current += content.size();
if (current < cursorPosition) {
continue;
}
TCursor cursor = {
.PrevTokenIndex = i,
.NextTokenIndex = i,
.Position = cursorPosition,
};
if (current == cursorPosition) {
cursor.NextTokenIndex += 1;
}
return cursor;
}
return {
.PrevTokenIndex = Nothing(),
.NextTokenIndex = 0,
.Position = cursorPosition,
};
}
TVector<size_t> GetTokenPositions(const TParsedTokenList& tokens) {
TVector<size_t> positions;
positions.reserve(tokens.size());
size_t pos = 0;
for (const auto& token : tokens) {
positions.emplace_back(pos);
pos += token.Content.size();
}
return positions;
}
} // namespace
bool TRichParsedToken::IsLiteral() const {
return Base->Name == "STRING_VALUE" ||
Base->Name == "DIGIGTS" ||
Base->Name == "INTEGER_VALUE" ||
Base->Name == "REAL";
}
TRichParsedToken TokenAt(const TCursorTokenContext& context, size_t index) {
return {
.Base = &context.Tokens.at(index),
.Index = index,
.Position = context.TokenPositions.at(index),
};
}
TMaybe<TRichParsedToken> TCursorTokenContext::Enclosing() const {
if (Tokens.size() == 1) {
Y_ENSURE(Tokens[0].Name == "EOF");
return Nothing();
}
if (Cursor.PrevTokenIndex.Empty()) {
return Nothing();
}
auto token = TokenAt(*this, *Cursor.PrevTokenIndex);
if (Cursor.PrevTokenIndex == Cursor.NextTokenIndex ||
!IsWordBoundary(token.Base->Content.back())) {
return token;
}
return Nothing();
}
TMaybe<TRichParsedToken> TCursorTokenContext::MatchCursorPrefix(const TVector<TStringBuf>& pattern) const {
const auto prefix = std::span{Tokens.begin(), Cursor.NextTokenIndex};
if (prefix.size() < pattern.size()) {
return Nothing();
}
ssize_t i = static_cast<ssize_t>(prefix.size()) - 1;
ssize_t j = static_cast<ssize_t>(pattern.size()) - 1;
for (; 0 <= j; --i, --j) {
if (!pattern[j].empty() && prefix[i].Name != pattern[j]) {
return Nothing();
}
}
return TokenAt(*this, prefix.size() - pattern.size());
}
bool GetStatement(
ILexer::TPtr& lexer,
const TMaterializedInput& input,
TCompletionInput& output,
size_t& output_position) {
TVector<TString> statements;
NYql::TIssues issues;
if (!NSQLTranslationV1::SplitQueryToStatements(
input.Text, lexer,
statements, issues, /* file = */ "",
/* areBlankSkipped = */ false)) {
return false;
}
size_t& cursor = output_position;
cursor = 0;
for (const auto& statement : statements) {
if (input.CursorPosition < cursor + statement.size()) {
output = {
.Text = TStringBuf(input.Text).SubStr(cursor, statement.size()),
.CursorPosition = input.CursorPosition - cursor,
};
return true;
}
cursor += statement.size();
}
output.Text = TStringBuf(input.Text);
output.CursorPosition = input.CursorPosition;
return true;
}
bool GetCursorTokenContext(ILexer::TPtr& lexer, TCompletionInput input, TCursorTokenContext& context) {
TParsedTokenList tokens;
if (!Tokenize(lexer, input, tokens)) {
return false;
}
TVector<size_t> positions = GetTokenPositions(tokens);
TCursor cursor = GetCursor(tokens, input.CursorPosition);
context = {
.Tokens = std::move(tokens),
.TokenPositions = std::move(positions),
.Cursor = cursor,
};
return true;
}
} // namespace NSQLComplete
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