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56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
#include <Common/StringUtils.h>
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#include <Parsers/CommonParsers.h>
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#include <common/find_first_symbols.h>
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#include <string.h> /// strncmp, strncasecmp
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namespace DB
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{
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ParserKeyword::ParserKeyword(const char * s_) : s(s_)
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{
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}
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const char * ParserKeyword::getName() const
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{
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return s;
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}
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bool ParserKeyword::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
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{
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const char * current_word = s;
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size_t s_length = strlen(s);
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if (!s_length)
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throw Exception("Logical error: keyword cannot be empty string", ErrorCodes::LOGICAL_ERROR);
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const char * s_end = s + s_length;
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while (true)
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{
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const char * next_whitespace = find_first_symbols<' ', '\0'>(current_word, s_end);
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size_t word_length = next_whitespace - current_word;
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if (static_cast<ptrdiff_t>(word_length) > pos->size())
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return false;
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if (strncasecmp(pos->begin, current_word, word_length))
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return false;
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++pos;
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if (!*next_whitespace)
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break;
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current_word = next_whitespace + 1;
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}
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return true;
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}
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}
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