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One instance of symbol -> terminal

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Dave Halter
2018-06-17 18:12:13 +02:00
parent b6cbf306d7
commit 640f544af9
1 changed files with 6 additions and 5 deletions
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11
parso/pgen2/pgen.py
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@@ -139,14 +139,15 @@ class ParserGenerator(object):
# It's a string. We have finally found a possible first token.
totalset.add(nonterminal_or_string)
overlapcheck[nonterminal_or_string] = set([nonterminal_or_string])
inverse = {}
for nonterminal_or_string, itsfirst in overlapcheck.items():
for symbol in itsfirst:
if symbol in inverse:
for nonterminal_or_string, first_set in overlapcheck.items():
for terminal in first_set:
if terminal in inverse:
raise ValueError("rule %s is ambiguous; %s is in the"
" first sets of %s as well as %s" %
(name, symbol, nonterminal_or_string, inverse[symbol]))
inverse[symbol] = nonterminal_or_string
(name, terminal, nonterminal_or_string, inverse[terminal]))
inverse[terminal] = nonterminal_or_string
self._first_terminals[name] = totalset