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Try removing more singleton rules

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rocky
2017-12-14 05:25:46 -05:00
parent 3ce5e0ab0e
commit cde12cde03
2 changed files with 19 additions and 2 deletions
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19
uncompyle6/parser.py
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@@ -46,6 +46,15 @@ class PythonParser(GenericASTBuilder):
]
self.collect = frozenset(nt_list)
# ??? 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'])
# Reduce singleton reductions in these nonterminals:
# FIXME: would love to do expr, sstmts, stmts and
# so on but that would require major changes to the
@@ -180,11 +189,19 @@ class PythonParser(GenericASTBuilder):
# stmts -> stmts stmt -> stmts stmt -> ...
# stmms -> stmt stmt ...
#
rv = args[0]
if not hasattr(args[0], 'append'):
# Was in self.optional_nt as a single item, but we find we have
# more than one now...
rv = GenericASTBuilder.nonterminal(self, nt, [args[0]])
else:
rv = args[0]
pass
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
elif n == 1 and nt in self.optional_nt:
rv = args[0]
else:
rv = GenericASTBuilder.nonterminal(self, nt, args)
return rv