45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
"""
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Parsers for specific attributes
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"""
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import urlparse
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from pyparsing import (Literal,
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Optional, oneOf, Group, StringEnd, Combine, Word, alphas, hexnums,
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CaselessLiteral, SkipTo
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)
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from css.colour import colourValue
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import string
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##Paint values
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none = CaselessLiteral("none").setParseAction(lambda t: ["NONE", ()])
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currentColor = CaselessLiteral("currentColor").setParseAction(lambda t: ["CURRENTCOLOR", ()])
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def parsePossibleURL(t):
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possibleURL, fallback = t[0]
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return [urlparse.urlsplit(possibleURL), fallback]
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#Normal color declaration
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colorDeclaration = none | currentColor | colourValue
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urlEnd = (
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Literal(")").suppress() +
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Optional(Group(colorDeclaration), default = ()) +
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StringEnd()
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)
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url = (
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CaselessLiteral("URL")
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+
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Literal("(").suppress()+
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Group(SkipTo(urlEnd, include = True).setParseAction(parsePossibleURL))
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)
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#paint value will parse into a (type, details) tuple.
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#For none and currentColor, the details tuple will be the empty tuple
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#for CSS color declarations, it will be (type, (R, G, B))
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#for URLs, it will be ("URL", ((url tuple), fallback))
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#The url tuple will be as returned by urlparse.urlsplit, and can be
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#an empty tuple if the parser has an error
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#The fallback will be another (type, details) tuple as a parsed
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#colorDeclaration, but may be the empty tuple if it is not present
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paintValue = url | colorDeclaration
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