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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

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Arash Partow
2014-12-30 15:58:51 +11:00
parent c8657e95a2
commit c0d3c3b364
3 changed files with 78 additions and 4 deletions
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66
exprtk.hpp
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@ -192,6 +192,45 @@ namespace exprtk
return result;
}
inline bool is_hex_digit(const std::string::value_type digit)
{
return (('0' <= digit) && (digit <= '9')) ||
(('A' <= digit) && (digit <= 'F')) ||
(('a' <= digit) && (digit <= 'f')) ;
}
inline unsigned char hex_to_bin(unsigned char h)
{
if (('0' <= h) && (h <= '9'))
return (h - '0');
else
return (std::toupper(h) - 'A');
}
template <typename Iterator>
inline void parse_hex(Iterator& itr, Iterator end, std::string::value_type& result)
{
if (
(end != (itr )) &&
(end != (itr + 1)) &&
(end != (itr + 2)) &&
(end != (itr + 3)) &&
('0' == *(itr )) &&
(
('x' == *(itr + 1)) ||
('X' == *(itr + 1))
) &&
(is_hex_digit(*(itr + 2))) &&
(is_hex_digit(*(itr + 3)))
)
{
result = hex_to_bin(*(itr + 2)) << 4 | hex_to_bin(*(itr + 3));
itr += 3;
}
else
result = '\0';
}
inline void cleanup_escapes(std::string& s)
{
std::string::iterator itr1 = s.begin();
@ -214,6 +253,9 @@ namespace exprtk
case 'n' : (*itr1) = '\n'; break;
case 'r' : (*itr1) = '\r'; break;
case 't' : (*itr1) = '\t'; break;
case '0' : parse_hex(itr1,end,(*itr1));
removal_count += 3;
break;
}
continue;
@ -2362,7 +2404,31 @@ namespace exprtk
break;
}
else if (escaped)
{
if (!is_end(s_itr_) && ('0' == *(s_itr_)))
{
if (
is_end(s_itr_ + 1) ||
is_end(s_itr_ + 2) ||
is_end(s_itr_ + 3) ||
(
('x' != *(s_itr_ + 1)) &&
('X' != *(s_itr_ + 1))
) ||
(!details::is_hex_digit(*(s_itr_ + 2))) ||
(!details::is_hex_digit(*(s_itr_ + 3)))
)
{
t.set_error(token::e_err_string,initial_itr,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
else
s_itr_ += 3;
}
escaped = false;
}
++s_itr_;
}