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Added names colours and refactored parseColorString()

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Zeno- authored and kwolekr committed Oct 29, 2014
1 parent 1cb6ea6 commit 813c088c1c66df45731c9015248b22d55e694c76
Showing with 269 additions and 57 deletions.
  1. +6 −0 doc/lua_api.txt
  2. +261 −50 src/util/string.cpp
  3. +2 −7 src/util/string.h
@@ -1265,6 +1265,12 @@ ColorString
#RRGGBBAA
^ defines a color in hexadecimal format and alpha channel

Named colors are also supported and are equivalent to "CSS Color Module Level 4"
(http://dev.w3.org/csswg/css-color/#named-colors). To specify the value of the
alpha channel, append #AA to the end of the color name (e.g. colorname#08). For
named colors the hexadecimal string representing the alpha value must (always)
be two hexadecimal digits.

Vector helpers
---------------
vector.new([x[, y, z]]) -> vector
@@ -24,12 +24,16 @@ with this program; if not, write to the Free Software Foundation, Inc.,

#include <sstream>
#include <iomanip>
#include <map>

#include "../sha1.h"
#include "../base64.h"
#include "../hex.h"
#include "../porting.h"

static bool parseHexColorString(const std::string &value, video::SColor &color);
static bool parseNamedColorString(const std::string &value, video::SColor &color);

#ifdef __ANDROID__
const wchar_t* wide_chars =
L" !\"#$%&'()*+,-./0123456789:;<=>?@"
@@ -307,62 +311,269 @@ u64 read_seed(const char *str)

bool parseColorString(const std::string &value, video::SColor &color, bool quiet)
{
const char *hexpattern = NULL;
video::SColor outcolor(255, 255, 255, 255);

if (value[0] == '#') {
if (value.size() == 9)
hexpattern = "#RRGGBBAA";
else if (value.size() == 7)
hexpattern = "#RRGGBB";
else if (value.size() == 5)
hexpattern = "#RGBA";
else if (value.size() == 4)
hexpattern = "#RGB";
}
bool success;

if (!hexpattern)
goto fail;
if (value[0] == '#')
success = parseHexColorString(value, color);
else
success = parseNamedColorString(value, color);

assert(strlen(hexpattern) == value.size());
for (size_t pos = 0; pos < value.size(); ++pos) {
// '#' in the pattern means skip that character
if (hexpattern[pos] == '#')
continue;
if (!success && !quiet)
errorstream << "Invalid color: \"" << value << "\"" << std::endl;

return success;
}

static bool parseHexColorString(const std::string &value, video::SColor &color)
{
unsigned char components[] = { 0x00, 0x00, 0x00, 0xff }; // R,G,B,A

// Else assume hexpattern[pos] is one of 'R' 'G' 'B' 'A'
// Read one or two digits, depending on hexpattern
unsigned char c1, c2;
if (hexpattern[pos+1] == hexpattern[pos]) {
// Two digits, e.g. hexpattern == "#RRGGBB"
if (!hex_digit_decode(value[pos], c1) ||
!hex_digit_decode(value[pos+1], c2))
goto fail;
++pos;
if (value[0] != '#')
return false;

size_t len = value.size();
bool short_form;

if (len == 9 || len == 7) // #RRGGBBAA or #RRGGBB
short_form = false;
else if (len == 5 || len == 4) // #RGBA or #RGB
short_form = true;
else
return false;

bool success = true;

for (size_t pos = 1, cc = 0; pos < len; pos++, cc++) {
assert(cc < sizeof components / sizeof components[0]);
if (short_form) {
unsigned char d;
if (!hex_digit_decode(value[pos], d)) {
success = false;
break;
}
components[cc] = (d & 0xf) << 4 | (d & 0xf);
} else {
// One digit, e.g. hexpattern == "#RGB"
if (!hex_digit_decode(value[pos], c1))
goto fail;
c2 = c1;
unsigned char d1, d2;
if (!hex_digit_decode(value[pos], d1) ||
!hex_digit_decode(value[pos+1], d2)) {
success = false;
break;
}
components[cc] = (d1 & 0xf) << 4 | (d2 & 0xf);
pos++; // skip the second digit -- it's already used
}
u32 colorpart = ((c1 & 0x0f) << 4) | (c2 & 0x0f);

// Update outcolor with newly read color part
if (hexpattern[pos] == 'R')
outcolor.setRed(colorpart);
else if (hexpattern[pos] == 'G')
outcolor.setGreen(colorpart);
else if (hexpattern[pos] == 'B')
outcolor.setBlue(colorpart);
else if (hexpattern[pos] == 'A')
outcolor.setAlpha(colorpart);
}

color = outcolor;
return true;
if (success) {
color.setRed(components[0]);
color.setGreen(components[1]);
color.setBlue(components[2]);
color.setAlpha(components[3]);
}

fail:
if (!quiet)
errorstream << "Invalid color: \"" << value << "\"" << std::endl;
return false;
return success;
}

struct ColorContainer {
ColorContainer();
std::map<const std::string, u32> colors;
};

ColorContainer::ColorContainer()
{
colors["aliceblue"] = 0xf0f8ff;
colors["antiquewhite"] = 0xfaebd7;
colors["aqua"] = 0x00ffff;
colors["aquamarine"] = 0x7fffd4;
colors["azure"] = 0xf0ffff;
colors["beige"] = 0xf5f5dc;
colors["bisque"] = 0xffe4c4;
colors["black"] = 00000000;
colors["blanchedalmond"] = 0xffebcd;
colors["blue"] = 0x0000ff;
colors["blueviolet"] = 0x8a2be2;
colors["brown"] = 0xa52a2a;
colors["burlywood"] = 0xdeb887;
colors["cadetblue"] = 0x5f9ea0;
colors["chartreuse"] = 0x7fff00;
colors["chocolate"] = 0xd2691e;
colors["coral"] = 0xff7f50;
colors["cornflowerblue"] = 0x6495ed;
colors["cornsilk"] = 0xfff8dc;
colors["crimson"] = 0xdc143c;
colors["cyan"] = 0x00ffff;
colors["darkblue"] = 0x00008b;
colors["darkcyan"] = 0x008b8b;
colors["darkgoldenrod"] = 0xb8860b;
colors["darkgray"] = 0xa9a9a9;
colors["darkgreen"] = 0x006400;
colors["darkkhaki"] = 0xbdb76b;
colors["darkmagenta"] = 0x8b008b;
colors["darkolivegreen"] = 0x556b2f;
colors["darkorange"] = 0xff8c00;
colors["darkorchid"] = 0x9932cc;
colors["darkred"] = 0x8b0000;
colors["darksalmon"] = 0xe9967a;
colors["darkseagreen"] = 0x8fbc8f;
colors["darkslateblue"] = 0x483d8b;
colors["darkslategray"] = 0x2f4f4f;
colors["darkturquoise"] = 0x00ced1;
colors["darkviolet"] = 0x9400d3;
colors["deeppink"] = 0xff1493;
colors["deepskyblue"] = 0x00bfff;
colors["dimgray"] = 0x696969;
colors["dodgerblue"] = 0x1e90ff;
colors["firebrick"] = 0xb22222;
colors["floralwhite"] = 0xfffaf0;
colors["forestgreen"] = 0x228b22;
colors["fuchsia"] = 0xff00ff;
colors["gainsboro"] = 0xdcdcdc;
colors["ghostwhite"] = 0xf8f8ff;
colors["gold"] = 0xffd700;
colors["goldenrod"] = 0xdaa520;
colors["gray"] = 0x808080;
colors["green"] = 0x008000;
colors["greenyellow"] = 0xadff2f;
colors["honeydew"] = 0xf0fff0;
colors["hotpink"] = 0xff69b4;
colors["indianred "] = 0xcd5c5c;
colors["indigo "] = 0x4b0082;
colors["ivory"] = 0xfffff0;
colors["khaki"] = 0xf0e68c;
colors["lavender"] = 0xe6e6fa;
colors["lavenderblush"] = 0xfff0f5;
colors["lawngreen"] = 0x7cfc00;
colors["lemonchiffon"] = 0xfffacd;
colors["lightblue"] = 0xadd8e6;
colors["lightcoral"] = 0xf08080;
colors["lightcyan"] = 0xe0ffff;
colors["lightgoldenrodyellow"] = 0xfafad2;
colors["lightgray"] = 0xd3d3d3;
colors["lightgreen"] = 0x90ee90;
colors["lightpink"] = 0xffb6c1;
colors["lightsalmon"] = 0xffa07a;
colors["lightseagreen"] = 0x20b2aa;
colors["lightskyblue"] = 0x87cefa;
colors["lightslategray"] = 0x778899;
colors["lightsteelblue"] = 0xb0c4de;
colors["lightyellow"] = 0xffffe0;
colors["lime"] = 0x00ff00;
colors["limegreen"] = 0x32cd32;
colors["linen"] = 0xfaf0e6;
colors["magenta"] = 0xff00ff;
colors["maroon"] = 0x800000;
colors["mediumaquamarine"] = 0x66cdaa;
colors["mediumblue"] = 0x0000cd;
colors["mediumorchid"] = 0xba55d3;
colors["mediumpurple"] = 0x9370db;
colors["mediumseagreen"] = 0x3cb371;
colors["mediumslateblue"] = 0x7b68ee;
colors["mediumspringgreen"] = 0x00fa9a;
colors["mediumturquoise"] = 0x48d1cc;
colors["mediumvioletred"] = 0xc71585;
colors["midnightblue"] = 0x191970;
colors["mintcream"] = 0xf5fffa;
colors["mistyrose"] = 0xffe4e1;
colors["moccasin"] = 0xffe4b5;
colors["navajowhite"] = 0xffdead;
colors["navy"] = 0x000080;
colors["oldlace"] = 0xfdf5e6;
colors["olive"] = 0x808000;
colors["olivedrab"] = 0x6b8e23;
colors["orange"] = 0xffa500;
colors["orangered"] = 0xff4500;
colors["orchid"] = 0xda70d6;
colors["palegoldenrod"] = 0xeee8aa;
colors["palegreen"] = 0x98fb98;
colors["paleturquoise"] = 0xafeeee;
colors["palevioletred"] = 0xdb7093;
colors["papayawhip"] = 0xffefd5;
colors["peachpuff"] = 0xffdab9;
colors["peru"] = 0xcd853f;
colors["pink"] = 0xffc0cb;
colors["plum"] = 0xdda0dd;
colors["powderblue"] = 0xb0e0e6;
colors["purple"] = 0x800080;
colors["red"] = 0xff0000;
colors["rosybrown"] = 0xbc8f8f;
colors["royalblue"] = 0x4169e1;
colors["saddlebrown"] = 0x8b4513;
colors["salmon"] = 0xfa8072;
colors["sandybrown"] = 0xf4a460;
colors["seagreen"] = 0x2e8b57;
colors["seashell"] = 0xfff5ee;
colors["sienna"] = 0xa0522d;
colors["silver"] = 0xc0c0c0;
colors["skyblue"] = 0x87ceeb;
colors["slateblue"] = 0x6a5acd;
colors["slategray"] = 0x708090;
colors["snow"] = 0xfffafa;
colors["springgreen"] = 0x00ff7f;
colors["steelblue"] = 0x4682b4;
colors["tan"] = 0xd2b48c;
colors["teal"] = 0x008080;
colors["thistle"] = 0xd8bfd8;
colors["tomato"] = 0xff6347;
colors["turquoise"] = 0x40e0d0;
colors["violet"] = 0xee82ee;
colors["wheat"] = 0xf5deb3;
colors["white"] = 0xffffff;
colors["whitesmoke"] = 0xf5f5f5;
colors["yellow"] = 0xffff00;
colors["yellowgreen"] = 0x9acd32;

}

static const ColorContainer named_colors;

static bool parseNamedColorString(const std::string &value, video::SColor &color)
{
std::string color_name;
std::string alpha_string;

/* If the string has a # in it, assume this is the start of a specified
* alpha value (if it isn't the string is invalid and the error will be
* caught later on, either because the color name won't be found or the
* alpha value will fail conversion)
*/
size_t alpha_pos = value.find('#');
if (alpha_pos != std::string::npos) {
color_name = value.substr(0, alpha_pos);
alpha_string = value.substr(alpha_pos + 1);
} else {
color_name = value;
}

color_name = lowercase(value);

std::map<const std::string, unsigned>::const_iterator it;
it = named_colors.colors.find(color_name);
if (it == named_colors.colors.end())
return false;

u32 color_temp = it->second;

/* An empty string for alpha is ok (none of the color table entries
* have an alpha value either). Color strings without an alpha specified
* are interpreted as fully opaque
*
* For named colors the supplied alpha string (representing a hex value)
* must be exactly two digits. For example: colorname#08
*/
if (!alpha_string.empty()) {
if (alpha_string.length() != 2)
return false;

unsigned char d1, d2;
if (!hex_digit_decode(alpha_string.at(0), d1)
|| !hex_digit_decode(alpha_string.at(1), d2))
return false;
color_temp |= ((d1 & 0xf) << 4 | (d2 & 0xf)) << 24;
} else {
color_temp |= 0xff << 24; // Fully opaque
}

color = video::SColor(color_temp);

return true;
}
@@ -126,13 +126,8 @@ inline std::vector<std::string> str_split(const std::string &str, char delimiter
inline std::string lowercase(const std::string &s)
{
std::string s2;
for(size_t i=0; i<s.size(); i++)
{
char c = s[i];
if(c >= 'A' && c <= 'Z')
c -= 'A' - 'a';
s2 += c;
}
for(size_t i = 0; i < s.size(); i++)
s2[i] = tolower(s.at(i));
return s2;
}

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