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""" Miscellaneous utilities. """
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import re
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# ---------------------------------------------------------------------
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def parse_page_numbers( val, offset=0 ):
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"""Parse a list of page numbers.
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We recognize a list of page numbers, and/or ranges e.g. 1,2,5-9,13.
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"""
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vals = set()
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if val:
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for v in val.split( "," ):
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mo = re.search( r"^(\d+)-(\d+)$", v )
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if mo:
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vals.update( range( int(mo.group(1)), int(mo.group(2))+1 ) )
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else:
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vals.add( int(v) )
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return [ v+offset for v in vals ]
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