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Increase test coverage. Remove some epsilon reductionsa

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rocky
2017-12-14 16:02:48 -05:00
parent 52f2b9341a
commit 6a1e8295b1
5 changed files with 13 additions and 4 deletions
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15
uncompyle6/parser.py
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@@ -46,14 +46,18 @@ class PythonParser(GenericASTBuilder):
]
self.collect = frozenset(nt_list)
# For these items we need to keep the 1st epslion reduction since
# the nonterminal name is used in a semantic action.
self.keep_epsilon = frozenset(('kvlist_n', 'kvlist'))
# ??? Do we need a debug option to skip eliding singleton reductions?
# Time will tell if it if useful in debugging
# FIXME: optional_nt is a misnomer. It's really about there being a
# singleton reduction that we can simplify. It also happens to be optional
# in its other derivation
self.optional_nt |= frozenset(['come_froms', 'suite_stmts', 'l_stmts_opt',
'c_stmts_opt'])
self.optional_nt |= frozenset(('come_froms', 'suite_stmts', 'l_stmts_opt',
'c_stmts_opt'))
# Reduce singleton reductions in these nonterminals:
# FIXME: would love to do expr, sstmts, stmts and
@@ -196,7 +200,12 @@ class PythonParser(GenericASTBuilder):
else:
rv = args[0]
pass
rv.append(args[1])
# In a list-like entity where the first item goes to epsilon,
# drop that and save the 2nd item as the first one
if len(rv) == 0 and nt not in self.keep_epsilon:
rv = args[1]
else:
rv.append(args[1])
elif n == 1 and args[0] in self.singleton:
rv = GenericASTBuilder.nonterminal(self, nt, args[0])
del args[0] # save memory