Parsing repeated characters

I'm new to parsing (obviously). I am using LEPL library to parse some markup language.

I have a problem with this code (I've omitted details for the sake of clarity).

from lepl import *

a = Literal('a')[0:,...] # 0 or more, join the result
b = Literal('b')

c = (a | b)[0:]

print c.parse("abaabaaab")

The last line should give me ['a','b','aa','b','aaa','b']

There is no error but it hangs (infinite recursion maybe?). Could anyone point me in the right direction?

Edit

I could do this like this

from lepl import *

a = Literal('a')
b = Literal('b')

c = (a | b)[0:]

print c.pa开发者_JAVA百科rse("abaabaaab")

But the a will not be grouped.

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I am pretty sure that, in your first example, you want

a = Literal('a')[1:]

With two [0:] repeats in your grammar, the parser will indeed run into effectively infinite backtracking.