Source code for enable.savage.svg.css.values

# (C) Copyright 2005-2022 Enthought, Inc., Austin, TX
# All rights reserved.
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
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""" Parser for various kinds of CSS values as per CSS2 spec section 4.3
from pyparsing import Combine, Literal, Optional, StringEnd, Word, oneOf

[docs]def asInt(s, l, t): return int(t[0])
[docs]def asFloat(s, l, t): return float(t[0])
[docs]def asFloatOrInt(s, l, t): """ Return an int if possible, otherwise a float""" v = t[0] try: return int(v) except ValueError: return float(v)
integer = Word("0123456789").setParseAction(asInt) number = Combine( Optional(Word("0123456789")) + Literal(".") + Word("01234567890") | integer ) number.setName("number") sign = oneOf("+ -") signedNumber = Combine(Optional(sign) + number).setParseAction(asFloat) lengthValue = Combine(Optional(sign) + number).setParseAction(asFloatOrInt) lengthValue.setName("lengthValue") lengthUnit = oneOf( ["em", "ex", "px", "pt", "in", "cm", "mm", "pc", "%"], caseless=True ) # the spec says that the unit is only optional for a 0 length, but # there are just too many places where a default is permitted. # TODO: Maybe should use a ctor like optional to let clients declare it? length = lengthValue + Optional(lengthUnit, default=None) + StringEnd() length.leaveWhitespace() # set the parse action aftward so it doesn't "infect" the parsers that build # on it number.setParseAction(asFloat)