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support of unimplemented std::regex

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This commit is contained in:
Jinhao 2015-02-25 22:15:02 +08:00
parent c2cb89f024
commit e721cfa51f
1 changed files with 141 additions and 0 deletions
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141
source/basic_types.cpp
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@ -11,7 +11,11 @@
*/
#include <nana/basic_types.hpp>
#if defined(USE_STD_REGEX)
#include <regex>
#else
#include <vector>
#endif
#include <algorithm>
namespace nana
@ -60,10 +64,46 @@ namespace nana
a_ = 1.0;
}
#if !defined(USE_STD_REGEX)
std::string read_number(std::string& str, std::size_t& pos)
{
pos = str.find_first_of("0123456789", pos);
if (pos == str.npos)
return{};
auto end = str.find_first_not_of("0123456789", pos + 1);
//integer part
if (end == str.npos)
{
pos = end;
return str.substr(pos);
}
if (str[end] == '.')
{
auto decimal_end = str.find_first_not_of("0123456789", end + 1);
if ((decimal_end == str.npos) || (decimal_end == end + 1)) //Because of missing %
return{};
end = decimal_end;
}
auto ch = str[end];
if (ch == '%' || ch == ' ' || ch == ',' || ch == ')')
{
auto start = pos;
pos = end + (ch == '%' ? 1 : 0);
return str.substr(start, pos - start);
}
return{};
}
#endif
//Initializes the color with a CSS-like string
//contributor: BigDave(mortis2007 at hotmail co uk)
//date: February 3, 2015
//maintainor: Jinhao, extended the support of CSS-spec
color::color(std::string css_color)
: a_(1.0)
{
@ -135,6 +175,7 @@ namespace nana
has_alpha = true;
}
#if defined(USE_STD_REGEX)
std::regex pat;
std::regex_iterator<std::string::iterator> i, end;
auto type_name = css_color.substr(pos, 3);
@ -222,6 +263,106 @@ namespace nana
throw std::invalid_argument(excpt_what); //invalid alpha value
a_ = ::nana::stod(i->str());
}
#else
auto type_name = css_color.substr(pos, 3);
pos = css_color.find_first_not_of(' ', type_end);
if (pos == css_color.npos || css_color[pos] != '(')
throw std::invalid_argument(excpt_what);
auto str = read_number(css_color, ++pos);
if (str.empty())
throw std::invalid_argument(excpt_what);
if ("rgb" == type_name)
{
std::vector<std::string> rgb;
rgb.emplace_back(std::move(str));
const bool is_real = (rgb.back().back() == '%');
for (int i = 0; i < 2; ++i)
{
pos = css_color.find_first_not_of(' ', pos);
if (pos == css_color.npos || css_color[pos] != ',')
throw std::invalid_argument(excpt_what);
str = read_number(css_color, ++pos);
if (str.empty())
throw std::invalid_argument(excpt_what);
rgb.emplace_back(std::move(str));
if (rgb.size() == 3)
break;
}
if (rgb.size() != 3)
throw std::invalid_argument(excpt_what);
if (is_real)
{
auto pr = ::nana::stod(rgb[0].substr(0, rgb[0].size() - 1));
r_ = (pr > 100 ? 255.0 : 2.55 * pr);
pr = ::nana::stod(rgb[1].substr(0, rgb[1].size() - 1));
g_ = (pr > 100 ? 255.0 : 2.55 * pr);
pr = ::nana::stod(rgb[2].substr(0, rgb[2].size() - 1));
b_ = (pr > 100 ? 255.0 : 2.55 * pr);
}
else
{
r_ = ::nana::stod(rgb[0]);
if (r_ > 255.0) r_ = 255;
g_ = ::nana::stod(rgb[1]);
if (g_ > 255.0) g_ = 255;
b_ = ::nana::stod(rgb[2]);
if (b_ > 255.0) b_ = 255;
}
}
else if ("hsl" == type_name)
{
if (str.back() == '%')
throw std::invalid_argument(excpt_what);
auto h = ::nana::stod(str);
pos = css_color.find_first_not_of(' ', pos);
if (pos == css_color.npos || css_color[pos] != ',')
throw std::invalid_argument(excpt_what);
str = read_number(css_color, ++pos);
if (str.empty() || str.back() != '%')
throw std::invalid_argument(excpt_what);
auto s = ::nana::stod(str.substr(0, str.size() - 1));
pos = css_color.find_first_not_of(' ', pos);
if (pos == css_color.npos || css_color[pos] != ',')
throw std::invalid_argument(excpt_what);
str = read_number(css_color, ++pos);
if (str.empty() || str.back() != '%')
throw std::invalid_argument(excpt_what);
auto l = ::nana::stod(str.substr(0, str.size() - 1));
from_hsl(h, s / 100, l / 100);
}
else
throw std::invalid_argument(excpt_what); //invalid color type
if (has_alpha)
{
str = read_number(css_color, ++pos);
if (str.empty() || str.back() == '%')
throw std::invalid_argument(excpt_what); //invalid alpha value
a_ = ::nana::stod(str);
}
#endif
}
color& color::from_rgb(unsigned red, unsigned green, unsigned blue)