DeCarabas/lrparsers
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Ok, one more bit of documentation.

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John Doty 2016-12-09 06:45:44 -08:00
parent 95b01a627d
commit 8d0726b3a4
1 changed files with 7 additions and 1 deletions
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8
parser.py
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@ -372,7 +372,13 @@ class GenerateSLR1(GenerateLR0):
return result return result
def gen_follow(self, symbol): def gen_follow(self, symbol):
"""Generate the follow set for the given nonterminal.""" """Generate the follow set for the given nonterminal.
The follow set for a nonterminal is the set of terminals that can
follow the nonterminal in a valid sentence. The resulting set never
contains epsilon and is never empty, since we should always at least
ground out at '$', which is the end-of-stream marker.
"""
if symbol == '__start': if symbol == '__start':
return tuple('$') return tuple('$')