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Move Tokens::operator and optimize the common path
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parent
96a1cb4a79
commit
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@ -4,6 +4,25 @@
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namespace DB
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namespace DB
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{
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{
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const Token & Tokens::operator[](size_t index)
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{
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if (likely(index < data.size()))
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return data[index];
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while (data.empty() || !data.back().isEnd())
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{
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Token token = lexer.nextToken();
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if (token.isSignificant())
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{
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data.emplace_back(std::move(token));
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if (index < data.size())
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return data[index];
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}
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}
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return data.back();
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}
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UnmatchedParentheses checkUnmatchedParentheses(TokenIterator begin)
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UnmatchedParentheses checkUnmatchedParentheses(TokenIterator begin)
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{
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{
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/// We have just two kind of parentheses: () and [].
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/// We have just two kind of parentheses: () and [].
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@ -25,22 +25,7 @@ private:
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public:
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public:
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Tokens(const char * begin, const char * end, size_t max_query_size = 0) : lexer(begin, end, max_query_size) {}
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Tokens(const char * begin, const char * end, size_t max_query_size = 0) : lexer(begin, end, max_query_size) {}
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const Token & operator[] (size_t index)
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const Token & operator[](size_t index);
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{
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while (true)
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{
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if (index < data.size())
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return data[index];
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if (!data.empty() && data.back().isEnd())
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return data.back();
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Token token = lexer.nextToken();
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if (token.isSignificant())
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data.emplace_back(token);
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}
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}
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const Token & max()
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const Token & max()
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{
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{
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