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faster: report multiple ambiguities

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This commit is contained in:
John Doty 2024-04-13 13:53:41 -07:00
parent 066ad1e982
commit d60566c5a4
1 changed files with 13 additions and 2 deletions
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15
parser_faster.py
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@ -164,6 +164,7 @@ class GenerateLR0(object):
if rule[0] == config.next
)
@functools.cache
def gen_closure(self, seeds):
"""Compute the closure for the specified configs. We have replaced a
recursive version with an iterative one."""
@ -180,6 +181,7 @@ class GenerateLR0(object):
return tuple(closure) # TODO: Why tuple?
@functools.cache
def gen_successor(self, config_set, symbol):
"""Compute the successor state for the given config set and the
given symbol.
@ -219,6 +221,7 @@ class GenerateLR0(object):
config_set = pending.pop()
if config_set in F:
continue
# print(f"pending: {len(pending)} F: {len(F)}")
F[config_set] = len(F)
for successor in self.gen_all_successors(config_set):
@ -278,6 +281,7 @@ class GenerateLR0(object):
Anything missing from the row indicates an error.
"""
errors = []
action_table = []
config_sets = self.gen_all_sets()
for config_set in config_sets:
@ -289,6 +293,7 @@ class GenerateLR0(object):
if config.name != '__start':
for a in self.gen_reduce_set(config):
self.set_table_action(
errors,
actions,
a,
('reduce', config.name, len(config.symbols)),
@ -296,6 +301,7 @@ class GenerateLR0(object):
)
else:
self.set_table_action(
errors,
actions,
'$',
('accept',),
@ -307,6 +313,7 @@ class GenerateLR0(object):
successor = self.gen_successor(config_set, config.next)
index = self.find_set_index(config_sets, successor)
self.set_table_action(
errors,
actions,
config.next,
('shift', index),
@ -319,6 +326,7 @@ class GenerateLR0(object):
index = self.find_set_index(config_sets, successor)
if index is not None:
self.set_table_action(
errors,
actions,
symbol,
('goto', index),
@ -331,9 +339,12 @@ class GenerateLR0(object):
actions = {k: self.get_table_action(actions, k) for k in actions}
action_table.append(actions)
if len(errors) > 0:
raise ValueError("\n\n".join(errors))
return action_table
def set_table_action(self, row, symbol, action, config):
def set_table_action(self, errors, row, symbol, action, config):
"""Set the action for 'symbol' in the table row to 'action'.
This is destructive; it changes the table. It raises an error if
@ -356,7 +367,7 @@ class GenerateLR0(object):
symbol=symbol,
)
)
raise ValueError(error)
errors.append(error)
row[symbol] = (action, config)
def get_table_action(self, row, symbol):