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refine

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This commit is contained in:
unbyte 2022-07-14 18:24:39 +08:00
parent 7c208abc58
commit fb97f27c33
1 changed files with 20 additions and 34 deletions
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54
src/Parsers/ExpressionElementParsers.cpp
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@ -1667,36 +1667,24 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
Field res;
if (pos->type == TokenType::BareWord && pos->size() == 3)
/// NaN and Inf
if (pos->type == TokenType::BareWord)
{
const char * word = pos->begin;
/// Inf and NaN are considered as numbers
if ((word[0] == 'n' || word[0] == 'N') &&
(word[1] == 'a' || word[1] == 'A') &&
(word[2] == 'n' || word[2] == 'N'))
{
res = std::numeric_limits<Float64>::quiet_NaN();
auto literal = std::make_shared<ASTLiteral>(res);
literal->begin = literal_begin;
literal->end = ++pos;
node = literal;
return true;
}
else if ((word[0] == 'i' || word[0] == 'I') &&
(word[1] == 'n' || word[1] == 'N') &&
(word[2] == 'f' || word[2] == 'F'))
char * float_end = nullptr;
errno = 0; /// Functions strto* don't clear errno.
Float64 float_value = std::strtod(pos->begin, &float_end);
if (float_end == pos->begin + pos->size() && errno != ERANGE)
{
if (negative)
res = -std::numeric_limits<Float64>::infinity();
else
res = std::numeric_limits<Float64>::infinity();
float_value = -float_value;
res = float_value;
auto literal = std::make_shared<ASTLiteral>(res);
literal->begin = literal_begin;
literal->end = ++pos;
node = literal;
return true;
}
return false;
@ -1705,7 +1693,6 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
if (pos->type != TokenType::Number)
return false;
/** Maximum length of number. 319 symbols is enough to write maximum double in decimal form.
* Copy is needed to use strto* functions, which require 0-terminated string.
*/
@ -1727,7 +1714,9 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
buf[size] = 0;
if (size == MAX_LENGTH_OF_NUMBER && cur < end)
/// If there are remaining chars,
/// the length of original number is greater than the MAX_LENGTH_OF_NUMBER
if (cur < end)
{
expected.add(pos, "number");
return false;
@ -1738,15 +1727,12 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
if (*start_pos == '0')
{
++start_pos;
// shadowing buf size to ignore prefix length
size_t numeric_size = size - 1;
/// binary
if (*start_pos == 'b')
{
++start_pos;
--numeric_size;
if (parseNumber(start_pos, numeric_size, negative, 2, res))
if (parseNumber(start_pos, size - 2, negative, 2, res))
{
auto literal = std::make_shared<ASTLiteral>(res);
literal->begin = literal_begin;
@ -1763,8 +1749,7 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
if (*start_pos == 'x' || *start_pos == 'X')
{
++start_pos;
--numeric_size;
if (parseNumber(start_pos, numeric_size, negative, 16, res))
if (parseNumber(start_pos, size - 2, negative, 16, res))
{
auto literal = std::make_shared<ASTLiteral>(res);
literal->begin = literal_begin;
@ -1776,13 +1761,14 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
}
else
{
size_t real_size = size - 1;
/// possible leading zeroes in integer
while (*start_pos == '0')
{
++start_pos;
--numeric_size;
--real_size;
}
if (parseNumber(start_pos, numeric_size, negative, 10, res))
if (parseNumber(start_pos, real_size, negative, 10, res))
{
auto literal = std::make_shared<ASTLiteral>(res);
literal->begin = literal_begin;
@ -1804,9 +1790,9 @@ bool ParserNumber::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
}
char * pos_double = buf;
errno = 0; /// Functions strto* don't clear errno.
errno = 0; /// Functions strto* don't clear errno.
Float64 float_value = std::strtod(buf, &pos_double);
if (pos_double == buf + size && errno != ERANGE)
if (errno != ERANGE)
{
if (float_value < 0)
throw Exception("Logical error: token number cannot begin with minus, but parsed float number is less than zero.", ErrorCodes::LOGICAL_ERROR);