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""" Parse CSS identifiers. More complicated than it sounds"""
from pyparsing import Word, Literal, Regex, Combine, Optional, White, oneOf, ZeroOrMore
import string
import re
class White(White):
""" Customize whitespace to match the CSS spec values"""
def __init__(self, ws=" \t\r\n\f", min=1, max=0, exact=0):
super(White, self).__init__(ws, min, max, exact)
escaped = (
Literal("\\").suppress() +
#chr(20)-chr(126) + chr(128)-unichr(sys.maxunicode)
Regex(u"[\u0020-\u007e\u0080-\uffff]", re.IGNORECASE)
)
def convertToUnicode(t):
return unichr(int(t[0], 16))
hex_unicode = (
Literal("\\").suppress() +
Regex("[0-9a-f]{1,6}", re.IGNORECASE) +
Optional(White(exact=1)).suppress()
).setParseAction(convertToUnicode)
escape = hex_unicode | escaped
#any unicode literal outside the 0-127 ascii range
nonascii = Regex(u"[^\u0000-\u007f]")
#single character for starting an identifier.
nmstart = Regex(u"[A-Z]", re.IGNORECASE) | nonascii | escape
nmchar = Regex(u"[0-9A-Z-]", re.IGNORECASE) | nonascii | escape
identifier = Combine(nmstart + ZeroOrMore(nmchar))
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