--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/frontends/src/tools/css_color.py	Sun Sep 25 15:41:43 2016 +0200
@@ -0,0 +1,239 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+# CSS color parsing
+# Copyright (C) 2009-2016 Jérome-Poisson
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from sat.core.log import getLogger
+log = getLogger(__name__)
+
+
+CSS_COLORS = {
+    u"black": u"000000",
+    u"silver": u"c0c0c0",
+    u"gray": u"808080",
+    u"white": u"ffffff",
+    u"maroon": u"800000",
+    u"red": u"ff0000",
+    u"purple": u"800080",
+    u"fuchsia": u"ff00ff",
+    u"green": u"008000",
+    u"lime": u"00ff00",
+    u"olive": u"808000",
+    u"yellow": u"ffff00",
+    u"navy": u"000080",
+    u"blue": u"0000ff",
+    u"teal": u"008080",
+    u"aqua": u"00ffff",
+    u"orange": u"ffa500",
+    u"aliceblue": u"f0f8ff",
+    u"antiquewhite": u"faebd7",
+    u"aquamarine": u"7fffd4",
+    u"azure": u"f0ffff",
+    u"beige": u"f5f5dc",
+    u"bisque": u"ffe4c4",
+    u"blanchedalmond": u"ffebcd",
+    u"blueviolet": u"8a2be2",
+    u"brown": u"a52a2a",
+    u"burlywood": u"deb887",
+    u"cadetblue": u"5f9ea0",
+    u"chartreuse": u"7fff00",
+    u"chocolate": u"d2691e",
+    u"coral": u"ff7f50",
+    u"cornflowerblue": u"6495ed",
+    u"cornsilk": u"fff8dc",
+    u"crimson": u"dc143c",
+    u"darkblue": u"00008b",
+    u"darkcyan": u"008b8b",
+    u"darkgoldenrod": u"b8860b",
+    u"darkgray": u"a9a9a9",
+    u"darkgreen": u"006400",
+    u"darkgrey": u"a9a9a9",
+    u"darkkhaki": u"bdb76b",
+    u"darkmagenta": u"8b008b",
+    u"darkolivegreen": u"556b2f",
+    u"darkorange": u"ff8c00",
+    u"darkorchid": u"9932cc",
+    u"darkred": u"8b0000",
+    u"darksalmon": u"e9967a",
+    u"darkseagreen": u"8fbc8f",
+    u"darkslateblue": u"483d8b",
+    u"darkslategray": u"2f4f4f",
+    u"darkslategrey": u"2f4f4f",
+    u"darkturquoise": u"00ced1",
+    u"darkviolet": u"9400d3",
+    u"deeppink": u"ff1493",
+    u"deepskyblue": u"00bfff",
+    u"dimgray": u"696969",
+    u"dimgrey": u"696969",
+    u"dodgerblue": u"1e90ff",
+    u"firebrick": u"b22222",
+    u"floralwhite": u"fffaf0",
+    u"forestgreen": u"228b22",
+    u"gainsboro": u"dcdcdc",
+    u"ghostwhite": u"f8f8ff",
+    u"gold": u"ffd700",
+    u"goldenrod": u"daa520",
+    u"greenyellow": u"adff2f",
+    u"grey": u"808080",
+    u"honeydew": u"f0fff0",
+    u"hotpink": u"ff69b4",
+    u"indianred": u"cd5c5c",
+    u"indigo": u"4b0082",
+    u"ivory": u"fffff0",
+    u"khaki": u"f0e68c",
+    u"lavender": u"e6e6fa",
+    u"lavenderblush": u"fff0f5",
+    u"lawngreen": u"7cfc00",
+    u"lemonchiffon": u"fffacd",
+    u"lightblue": u"add8e6",
+    u"lightcoral": u"f08080",
+    u"lightcyan": u"e0ffff",
+    u"lightgoldenrodyellow": u"fafad2",
+    u"lightgray": u"d3d3d3",
+    u"lightgreen": u"90ee90",
+    u"lightgrey": u"d3d3d3",
+    u"lightpink": u"ffb6c1",
+    u"lightsalmon": u"ffa07a",
+    u"lightseagreen": u"20b2aa",
+    u"lightskyblue": u"87cefa",
+    u"lightslategray": u"778899",
+    u"lightslategrey": u"778899",
+    u"lightsteelblue": u"b0c4de",
+    u"lightyellow": u"ffffe0",
+    u"limegreen": u"32cd32",
+    u"linen": u"faf0e6",
+    u"mediumaquamarine": u"66cdaa",
+    u"mediumblue": u"0000cd",
+    u"mediumorchid": u"ba55d3",
+    u"mediumpurple": u"9370db",
+    u"mediumseagreen": u"3cb371",
+    u"mediumslateblue": u"7b68ee",
+    u"mediumspringgreen": u"00fa9a",
+    u"mediumturquoise": u"48d1cc",
+    u"mediumvioletred": u"c71585",
+    u"midnightblue": u"191970",
+    u"mintcream": u"f5fffa",
+    u"mistyrose": u"ffe4e1",
+    u"moccasin": u"ffe4b5",
+    u"navajowhite": u"ffdead",
+    u"oldlace": u"fdf5e6",
+    u"olivedrab": u"6b8e23",
+    u"orangered": u"ff4500",
+    u"orchid": u"da70d6",
+    u"palegoldenrod": u"eee8aa",
+    u"palegreen": u"98fb98",
+    u"paleturquoise": u"afeeee",
+    u"palevioletred": u"db7093",
+    u"papayawhip": u"ffefd5",
+    u"peachpuff": u"ffdab9",
+    u"peru": u"cd853f",
+    u"pink": u"ffc0cb",
+    u"plum": u"dda0dd",
+    u"powderblue": u"b0e0e6",
+    u"rosybrown": u"bc8f8f",
+    u"royalblue": u"4169e1",
+    u"saddlebrown": u"8b4513",
+    u"salmon": u"fa8072",
+    u"sandybrown": u"f4a460",
+    u"seagreen": u"2e8b57",
+    u"seashell": u"fff5ee",
+    u"sienna": u"a0522d",
+    u"skyblue": u"87ceeb",
+    u"slateblue": u"6a5acd",
+    u"slategray": u"708090",
+    u"slategrey": u"708090",
+    u"snow": u"fffafa",
+    u"springgreen": u"00ff7f",
+    u"steelblue": u"4682b4",
+    u"tan": u"d2b48c",
+    u"thistle": u"d8bfd8",
+    u"tomato": u"ff6347",
+    u"turquoise": u"40e0d0",
+    u"violet": u"ee82ee",
+    u"wheat": u"f5deb3",
+    u"whitesmoke": u"f5f5f5",
+    u"yellowgreen": u"9acd32",
+    u"rebeccapurple": u"663399"
+}
+DEFAULT = u"000000"
+
+
+def parse(raw_value, as_string=True):
+    """parse CSS color value and return normalised value
+
+    @param raw_value(unicode): CSS value
+    @param as_string(bool): if True return a string,
+        else return a tuple of int
+    @return (unicode, tuple): normalised value
+        if as_string is True, value is 3 or 4 hex words (e.g. u"ff00aabb")
+        else value is a 3 or 4 tuple of int (e.g.: (255, 0, 170, 187)).
+        If present, the 4th value is the alpha channel
+        If value can't be parsed, a warning message is logged, and DEFAULT is returned
+    """
+    raw_value = raw_value.strip().lower()
+    if raw_value.startswith(u'#'):
+        # we have a hexadecimal value
+        str_value = raw_value[1:]
+        if len(raw_value) in (3,4):
+            str_value = u''.join([2*v for v in str_value])
+    elif raw_value.startswith(u'rgb'):
+        left_p = raw_value.find(u'(')
+        right_p = raw_value.find(u')')
+        rgb_values = [v.strip() for v in raw_value[left_p+1:right_p].split(',')]
+        expected_len = 4 if raw_value.startswith(u'rgba') else 3
+        if len(rgb_values) != expected_len:
+            log.warning(u"incorrect value: {}".format(raw_value))
+            str_value = DEFAULT
+        else:
+            int_values = []
+            for rgb_v in rgb_values:
+                p_idx = rgb_v.find(u'%')
+                if p_idx == -1:
+                    # base 10 value
+                    try:
+                        int_v = int(rgb_v)
+                        if int_v > 255:
+                            raise ValueError(u"value exceed 255")
+                        int_values.append(int_v)
+                    except ValueError:
+                        log.warning(u"invalid int: {}".format(rgb_v))
+                        int_values.append(0)
+                else:
+                    # percentage
+                    try:
+                        int_v = int(int(rgb_v[:p_idx]) / 100.0 * 255)
+                        if int_v > 255:
+                            raise ValueError(u"value exceed 255")
+                        int_values.append(int_v)
+                    except ValueError:
+                        log.warning(u"invalid percent value: {}".format(rgb_v))
+                        int_values.append(0)
+            str_value = u''.join([u"{:02x}".format(v) for v in int_values])
+    elif raw_value.startswith(u'hsl'):
+        log.warning(u"hue-saturation-lightness not handled yet")  # TODO
+        str_value = DEFAULT
+    else:
+        try:
+            str_value = CSS_COLORS[raw_value]
+        except KeyError:
+            log.warning(u"unrecognised format: {}".format(raw_value))
+            str_value = DEFAULT
+
+    if as_string:
+        return str_value
+    else:
+        return tuple([int(str_value[i]+str_value[i+1], 16) for i in xrange(0, len(str_value), 2)])