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Various usability improvements

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This commit is contained in:
David Beazley
2018-11-18 06:42:22 -06:00
parent 0ac3c1a0a3
commit 503fae9e18
2 changed files with 31 additions and 9 deletions
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19
sly/yacc.py
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@@ -152,10 +152,10 @@ class YaccProduction:
raise AttributeError(f'No symbol {name}. Must be one of {nameset}.')
def __setattr__(self, name, value):
if name[0:1] == '_' or name not in self._namemap:
if name[:1] == '_':
super().__setattr__(name, value)
else:
self._slice[self._namemap[name]].value = value
raise AttributeError(f"Can't reassign the value of attribute {name!r}")
# -----------------------------------------------------------------------------
# === Grammar Representation ===
@@ -1719,9 +1719,10 @@ class Parser(metaclass=ParserMeta):
for u in unreachable:
cls.log.warning('Symbol %r is unreachable', u)
infinite = grammar.infinite_cycles()
for inf in infinite:
errors += 'Infinite recursion detected for symbol %r\n' % inf
if len(undefined_symbols) == 0:
infinite = grammar.infinite_cycles()
for inf in infinite:
errors += 'Infinite recursion detected for symbol %r\n' % inf
unused_prec = grammar.unused_precedence()
for term, assoc in unused_prec:
@@ -1806,11 +1807,11 @@ class Parser(metaclass=ParserMeta):
if token:
lineno = getattr(token, 'lineno', 0)
if lineno:
sys.stderr.write(f'yacc: Syntax error at line {lineno}, token={token.type}\n')
sys.stderr.write(f'sly: Syntax error at line {lineno}, token={token.type}\n')
else:
sys.stderr.write(f'yacc: Syntax error, token={token.type}')
sys.stderr.write(f'sly: Syntax error, token={token.type}')
else:
sys.stderr.write('yacc: Parse error in input. EOF\n')
sys.stderr.write('sly: Parse error in input. EOF\n')
def errok(self):
'''
@@ -1995,4 +1996,4 @@ class Parser(metaclass=ParserMeta):
continue
# Call an error function here
raise RuntimeError('yacc: internal parser error!!!\n')
raise RuntimeError('sly: internal parser error!!!\n')