ClickHouse/dbms/src/Parsers/CommonParsers.cpp

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