Ruud
385 lines
12 KiB
Python
385 lines
12 KiB
Python
from math import pi
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import re
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# ------------------------------------------------------------------------------
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# Built-in CSS color names
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# See: http://www.w3.org/TR/css3-color/#svg-color
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COLOR_NAMES = {
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'aliceblue': (240, 248, 255, 1),
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'antiquewhite': (250, 235, 215, 1),
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'aqua': (0, 255, 255, 1),
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'aquamarine': (127, 255, 212, 1),
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'azure': (240, 255, 255, 1),
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'beige': (245, 245, 220, 1),
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'bisque': (255, 228, 196, 1),
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'black': (0, 0, 0, 1),
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'blanchedalmond': (255, 235, 205, 1),
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'blue': (0, 0, 255, 1),
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'blueviolet': (138, 43, 226, 1),
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'brown': (165, 42, 42, 1),
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'burlywood': (222, 184, 135, 1),
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'cadetblue': (95, 158, 160, 1),
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'chartreuse': (127, 255, 0, 1),
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'chocolate': (210, 105, 30, 1),
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'coral': (255, 127, 80, 1),
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'cornflowerblue': (100, 149, 237, 1),
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'cornsilk': (255, 248, 220, 1),
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'crimson': (220, 20, 60, 1),
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'cyan': (0, 255, 255, 1),
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'darkblue': (0, 0, 139, 1),
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'darkcyan': (0, 139, 139, 1),
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'darkgoldenrod': (184, 134, 11, 1),
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'darkgray': (169, 169, 169, 1),
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'darkgreen': (0, 100, 0, 1),
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'darkkhaki': (189, 183, 107, 1),
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'darkmagenta': (139, 0, 139, 1),
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'darkolivegreen': (85, 107, 47, 1),
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'darkorange': (255, 140, 0, 1),
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'darkorchid': (153, 50, 204, 1),
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'darkred': (139, 0, 0, 1),
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'darksalmon': (233, 150, 122, 1),
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'darkseagreen': (143, 188, 143, 1),
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'darkslateblue': (72, 61, 139, 1),
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'darkslategray': (47, 79, 79, 1),
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'darkturquoise': (0, 206, 209, 1),
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'darkviolet': (148, 0, 211, 1),
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'deeppink': (255, 20, 147, 1),
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'deepskyblue': (0, 191, 255, 1),
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'dimgray': (105, 105, 105, 1),
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'dodgerblue': (30, 144, 255, 1),
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'firebrick': (178, 34, 34, 1),
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'floralwhite': (255, 250, 240, 1),
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'forestgreen': (34, 139, 34, 1),
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'fuchsia': (255, 0, 255, 1),
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'gainsboro': (220, 220, 220, 1),
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'ghostwhite': (248, 248, 255, 1),
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'gold': (255, 215, 0, 1),
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'goldenrod': (218, 165, 32, 1),
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'gray': (128, 128, 128, 1),
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'green': (0, 128, 0, 1),
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'greenyellow': (173, 255, 47, 1),
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'honeydew': (240, 255, 240, 1),
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'hotpink': (255, 105, 180, 1),
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'indianred': (205, 92, 92, 1),
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'indigo': (75, 0, 130, 1),
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'ivory': (255, 255, 240, 1),
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'khaki': (240, 230, 140, 1),
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'lavender': (230, 230, 250, 1),
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'lavenderblush': (255, 240, 245, 1),
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'lawngreen': (124, 252, 0, 1),
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'lemonchiffon': (255, 250, 205, 1),
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'lightblue': (173, 216, 230, 1),
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'lightcoral': (240, 128, 128, 1),
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'lightcyan': (224, 255, 255, 1),
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'lightgoldenrodyellow': (250, 250, 210, 1),
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'lightgreen': (144, 238, 144, 1),
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'lightgrey': (211, 211, 211, 1),
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'lightpink': (255, 182, 193, 1),
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'lightsalmon': (255, 160, 122, 1),
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'lightseagreen': (32, 178, 170, 1),
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'lightskyblue': (135, 206, 250, 1),
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'lightslategray': (119, 136, 153, 1),
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'lightsteelblue': (176, 196, 222, 1),
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'lightyellow': (255, 255, 224, 1),
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'lime': (0, 255, 0, 1),
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'limegreen': (50, 205, 50, 1),
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'linen': (250, 240, 230, 1),
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'magenta': (255, 0, 255, 1),
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'maroon': (128, 0, 0, 1),
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'mediumaquamarine': (102, 205, 170, 1),
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'mediumblue': (0, 0, 205, 1),
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'mediumorchid': (186, 85, 211, 1),
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'mediumpurple': (147, 112, 219, 1),
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'mediumseagreen': (60, 179, 113, 1),
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'mediumslateblue': (123, 104, 238, 1),
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'mediumspringgreen': (0, 250, 154, 1),
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'mediumturquoise': (72, 209, 204, 1),
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'mediumvioletred': (199, 21, 133, 1),
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'midnightblue': (25, 25, 112, 1),
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'mintcream': (245, 255, 250, 1),
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'mistyrose': (255, 228, 225, 1),
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'moccasin': (255, 228, 181, 1),
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'navajowhite': (255, 222, 173, 1),
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'navy': (0, 0, 128, 1),
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'oldlace': (253, 245, 230, 1),
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'olive': (128, 128, 0, 1),
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'olivedrab': (107, 142, 35, 1),
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'orange': (255, 165, 0, 1),
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'orangered': (255, 69, 0, 1),
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'orchid': (218, 112, 214, 1),
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'palegoldenrod': (238, 232, 170, 1),
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'palegreen': (152, 251, 152, 1),
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'paleturquoise': (175, 238, 238, 1),
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'palevioletred': (219, 112, 147, 1),
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'papayawhip': (255, 239, 213, 1),
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'peachpuff': (255, 218, 185, 1),
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'peru': (205, 133, 63, 1),
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'pink': (255, 192, 203, 1),
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'plum': (221, 160, 221, 1),
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'powderblue': (176, 224, 230, 1),
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'purple': (128, 0, 128, 1),
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'red': (255, 0, 0, 1),
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'rosybrown': (188, 143, 143, 1),
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'royalblue': (65, 105, 225, 1),
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'saddlebrown': (139, 69, 19, 1),
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'salmon': (250, 128, 114, 1),
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'sandybrown': (244, 164, 96, 1),
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'seagreen': (46, 139, 87, 1),
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'seashell': (255, 245, 238, 1),
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'sienna': (160, 82, 45, 1),
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'silver': (192, 192, 192, 1),
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'skyblue': (135, 206, 235, 1),
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'slateblue': (106, 90, 205, 1),
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'slategray': (112, 128, 144, 1),
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'snow': (255, 250, 250, 1),
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'springgreen': (0, 255, 127, 1),
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'steelblue': (70, 130, 180, 1),
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'tan': (210, 180, 140, 1),
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'teal': (0, 128, 128, 1),
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'thistle': (216, 191, 216, 1),
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'tomato': (255, 99, 71, 1),
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'transparent': (0, 0, 0, 0),
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'turquoise': (64, 224, 208, 1),
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'violet': (238, 130, 238, 1),
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'wheat': (245, 222, 179, 1),
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'white': (255, 255, 255, 1),
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'whitesmoke': (245, 245, 245, 1),
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'yellow': (255, 255, 0, 1),
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'yellowgreen': (154, 205, 50, 1),
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}
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COLOR_LOOKUP = dict((v, k) for (k, v) in COLOR_NAMES.items())
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# ------------------------------------------------------------------------------
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# Built-in CSS units
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# See: http://www.w3.org/TR/2013/CR-css3-values-20130730/#numeric-types
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# Maps units to a set of common units per type, with conversion factors
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BASE_UNIT_CONVERSIONS = {
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# Lengths
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'mm': (1, 'mm'),
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'cm': (10, 'mm'),
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'in': (25.4, 'mm'),
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'px': (25.4 / 96, 'mm'),
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'pt': (25.4 / 72, 'mm'),
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'pc': (25.4 / 6, 'mm'),
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# Angles
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'deg': (1 / 360, 'turn'),
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'grad': (1 / 400, 'turn'),
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'rad': (pi / 2, 'turn'),
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'turn': (1, 'turn'),
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# Times
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'ms': (1, 'ms'),
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's': (1000, 'ms'),
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# Frequencies
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'hz': (1, 'hz'),
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'khz': (1000, 'hz'),
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# Resolutions
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'dpi': (1, 'dpi'),
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'dpcm': (2.54, 'dpi'),
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'dppx': (96, 'dpi'),
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}
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def get_conversion_factor(unit):
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"""Look up the "base" unit for this unit and the factor for converting to
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it.
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Returns a 2-tuple of `factor, base_unit`.
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"""
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if unit in BASE_UNIT_CONVERSIONS:
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return BASE_UNIT_CONVERSIONS[unit]
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else:
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return 1, unit
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def convert_units_to_base_units(units):
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"""Convert a set of units into a set of "base" units.
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Returns a 2-tuple of `factor, new_units`.
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"""
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total_factor = 1
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new_units = []
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for unit in units:
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if unit not in BASE_UNIT_CONVERSIONS:
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continue
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factor, new_unit = BASE_UNIT_CONVERSIONS[unit]
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total_factor *= factor
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new_units.append(new_unit)
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new_units.sort()
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return total_factor, tuple(new_units)
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def count_base_units(units):
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"""Returns a dict mapping names of base units to how many times they
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appear in the given iterable of units. Effectively this counts how
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many length units you have, how many time units, and so forth.
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"""
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ret = {}
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for unit in units:
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factor, base_unit = get_conversion_factor(unit)
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ret.setdefault(base_unit, 0)
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ret[base_unit] += 1
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return ret
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def cancel_base_units(units, to_remove):
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"""Given a list of units, remove a specified number of each base unit.
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Arguments:
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units: an iterable of units
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to_remove: a mapping of base_unit => count, such as that returned from
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count_base_units
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Returns a 2-tuple of (factor, remaining_units).
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"""
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# Copy the dict since we're about to mutate it
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to_remove = to_remove.copy()
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remaining_units = []
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total_factor = 1
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for unit in units:
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factor, base_unit = get_conversion_factor(unit)
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if not to_remove.get(base_unit, 0):
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remaining_units.append(unit)
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continue
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total_factor *= factor
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to_remove[base_unit] -= 1
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return total_factor, remaining_units
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# A fixed set of units can be omitted when the value is 0
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# See: http://www.w3.org/TR/2013/CR-css3-values-20130730/#lengths
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ZEROABLE_UNITS = frozenset((
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# Relative lengths
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'em', 'ex', 'ch', 'rem',
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# Viewport
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'vw', 'vh', 'vmin', 'vmax',
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# Absolute lengths
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'cm', 'mm', 'in', 'px', 'pt', 'pc',
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))
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# ------------------------------------------------------------------------------
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# Built-in CSS function reference
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# Known function names
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BUILTIN_FUNCTIONS = frozenset([
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# CSS2
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'attr', 'counter', 'counters', 'url', 'rgb', 'rect',
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# CSS3 values: http://www.w3.org/TR/css3-values/
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'calc', 'min', 'max', 'cycle',
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# CSS3 colors: http://www.w3.org/TR/css3-color/
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'rgba', 'hsl', 'hsla',
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# CSS3 fonts: http://www.w3.org/TR/css3-fonts/
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'local', 'format',
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# CSS3 images: http://www.w3.org/TR/css3-images/
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'image', 'element',
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'linear-gradient', 'radial-gradient',
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'repeating-linear-gradient', 'repeating-radial-gradient',
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# CSS3 transforms: http://www.w3.org/TR/css3-transforms/
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'perspective',
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'matrix', 'matrix3d',
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'rotate', 'rotateX', 'rotateY', 'rotateZ', 'rotate3d',
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'translate', 'translateX', 'translateY', 'translateZ', 'translate3d',
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'scale', 'scaleX', 'scaleY', 'scaleZ', 'scale3d',
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'skew', 'skewX', 'skewY',
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# CSS3 transitions: http://www.w3.org/TR/css3-transitions/
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'cubic-bezier', 'steps',
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# CSS filter effects:
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# https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
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'grayscale', 'sepia', 'saturate', 'hue-rotate', 'invert', 'opacity',
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'brightness', 'contrast', 'blur', 'drop-shadow', 'custom',
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# CSS4 image module:
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# http://dev.w3.org/csswg/css-images/
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'image-set', 'cross-fade',
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'conic-gradient', 'repeating-conic-gradient',
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# Others
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'color-stop', # Older version of CSS3 gradients
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'mask', # ???
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'from', 'to', # Very old WebKit gradient syntax
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])
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def is_builtin_css_function(name):
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"""Returns whether the given `name` looks like the name of a builtin CSS
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function.
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Unrecognized functions not in this list produce warnings.
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"""
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name = name.replace('_', '-')
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if name in BUILTIN_FUNCTIONS:
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return True
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# Vendor-specific functions (-foo-bar) are always okay
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if name[0] == '-' and '-' in name[1:]:
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return True
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return False
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# ------------------------------------------------------------------------------
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# Bits and pieces of grammar, as regexen
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SEPARATOR = '\x00'
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_expr_glob_re = re.compile(r'''
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\#\{(.*?)\} # Global Interpolation only
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''', re.VERBOSE)
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# XXX these still need to be fixed; the //-in-functions thing is a chumpy hack
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_ml_comment_re = re.compile(r'\/\*(.*?)\*\/', re.DOTALL)
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_sl_comment_re = re.compile(r'(?<!\burl[(])(?<!\w{2}:)\/\/.*')
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_escape_chars_re = re.compile(r'([^-a-zA-Z0-9_])')
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_interpolate_re = re.compile(r'(#\{\s*)?(\$[-\w]+)(?(1)\s*\})')
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_spaces_re = re.compile(r'\s+')
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_expand_rules_space_re = re.compile(r'\s*{')
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_collapse_properties_space_re = re.compile(r'([:#])\s*{')
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_variable_re = re.compile('^\\$[-a-zA-Z0-9_]+$')
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_strings_re = re.compile(r'([\'"]).*?\1')
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_has_placeholder_re = re.compile(r'(?<!\w)([a-z]\w*)?%')
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_prop_split_re = re.compile(r'[:=]')
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_has_code_re = re.compile('''
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(?:^|(?<=[{;}])) # the character just before it should be a '{', a ';' or a '}'
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\s* # ...followed by any number of spaces
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(?:
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(?:
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\+
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| @include
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| @warn
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| @mixin
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| @function
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| @if
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| @else
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| @for
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| @each
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)
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(?![^(:;}]*['"])
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@import
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)
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''', re.VERBOSE)
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