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Rewrite rgb color parsing

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This commit is contained in:
Maxime Coste 2015-04-02 21:27:41 +01:00
parent ee5283a9b1
commit 762f60f9fd
1 changed files with 16 additions and 9 deletions
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25
src/color.cc
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@ -32,16 +32,23 @@ Color str_to_color(StringView color)
if (it != std::end(color_names)) if (it != std::end(color_names))
return static_cast<Colors>(it - color_names); return static_cast<Colors>(it - color_names);
static const Regex rgb_regex{"rgb:[0-9a-fA-F]{6}"}; auto hval = [&color](char c) -> int
if (regex_match(color.begin(), color.end(), rgb_regex))
{ {
unsigned l; if (c >= 'A' and c <= 'F')
sscanf(color.zstr() + 4, "%x", &l); return 10 + c - 'A';
return { (unsigned char)((l >> 16) & 0xFF), else if (c >= 'a' and c <= 'f')
(unsigned char)((l >> 8) & 0xFF), return 10 + c - 'a';
(unsigned char)(l & 0xFF) }; else if (c >= '0' and c <= '9')
} return c - '0';
throw runtime_error("Unable to parse color '" + color + "'"); throw runtime_error(format("invalid digit '{}' in '{}'", c, color));
};
if (color.length() == 10 and color.substr(0_byte, 4_byte) == "rgb:")
return { (unsigned char)(hval(color[4]) * 16 + hval(color[5])),
(unsigned char)(hval(color[6]) * 16 + hval(color[7])),
(unsigned char)(hval(color[8]) * 16 + hval(color[9])) };
throw runtime_error(format("Unable to parse color '{}'", color));
return Colors::Default; return Colors::Default;
} }