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elpranselprans
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-396
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17 files changed

+632
-396
lines changed

‎.flake8‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,3 @@
11
[flake8]
2-
ignore = E121,E126,E127,E226,W504
2+
ignore = E203,W503
33
exclude = .git,__pycache__,build,dist,.eggs,.tox

‎parsing/__init__.py‎

Lines changed: 113 additions & 60 deletions
Original file line numberDiff line numberDiff line change
@@ -121,17 +121,38 @@
121121
122122
123123
"""
124-
__all__ = ["SpecError", "UnexpectedToken", "Nonterm",
125-
"Precedence", "Spec", "Token", "Lr", "Glr",
126-
"ModuleSpecSource"]
127-
128-
from parsing.errors import (ParsingError, SpecError, # noqa
129-
UnexpectedToken, AnyException) # noqa
130-
from parsing.grammar import (Precedence, Production, SymbolSpec, # noqa
131-
NontermSpec, TokenSpec, EndOfInput, # noqa
132-
Epsilon, epsilon, NontermStart, # noqa
133-
ShiftAction, ReduceAction)
134-
from parsing.ast import Symbol, Nonterm, Token # noqa
124+
__all__ = [
125+
"SpecError",
126+
"UnexpectedToken",
127+
"Nonterm",
128+
"Precedence",
129+
"Spec",
130+
"Token",
131+
"Lr",
132+
"Glr",
133+
"ModuleSpecSource",
134+
]
135+
136+
from parsing.errors import ( # noqa: F401
137+
ParsingError,
138+
SpecError,
139+
UnexpectedToken,
140+
AnyException,
141+
)
142+
from parsing.grammar import ( # noqa: F401
143+
Precedence,
144+
Production,
145+
SymbolSpec,
146+
NontermSpec,
147+
TokenSpec,
148+
EndOfInput,
149+
Epsilon,
150+
epsilon,
151+
NontermStart,
152+
ShiftAction,
153+
ReduceAction,
154+
)
155+
from parsing.ast import Symbol, Nonterm, Token # noqa: F401
135156
from parsing.automaton import Spec
136157
from parsing.module_spec import ModuleSpecSource
137158

@@ -185,7 +206,8 @@ def __setStart(self, start):
185206
A list of parsing results. For LR parsing, there is only ever one
186207
result, but for compatibility with the Glr interface, start is a
187208
list.
188-
""")
209+
""",
210+
)
189211

190212
def __getVerbose(self):
191213
return self._verbose
@@ -246,15 +268,20 @@ def _act(self, sym, symSpec):
246268
self._printStack()
247269

248270
def _printStack(self):
249-
print("STACK:", end=' ')
271+
print("STACK:", end=" ")
250272
for node in self._stack:
251-
print("%r" % node[0], end=' ')
273+
print("%r" % node[0], end=" ")
252274
print()
253-
print(" ", end=' ')
275+
print(" ", end=" ")
254276
for node in self._stack:
255-
print("%r%s" % (
256-
node[1], (" " * (len("%r" % node[0]) - len("%r" % node[1])))),
257-
end=' ')
277+
print(
278+
"%r%s"
279+
% (
280+
node[1],
281+
(" " * (len("%r" % node[0]) - len("%r" % node[1]))),
282+
),
283+
end=" ",
284+
)
258285
print()
259286

260287
def _reduce(self, production):
@@ -284,6 +311,7 @@ def _production(self, production, rhs):
284311

285312
return r
286313

314+
287315
# ===========================================================================
288316
# Begin graph-structured stack (GSS) classes.
289317
#
@@ -310,8 +338,7 @@ def __repr__(self):
310338
return "{%r}" % self.value
311339

312340
def __eq__(self, other):
313-
if self.node != other.node \
314-
or self.value != other.value:
341+
if self.node != other.node or self.value != other.value:
315342
return False
316343
return True
317344

@@ -378,17 +405,17 @@ def _pathsRecurse(self, pathLen, path):
378405
path.pop(0)
379406
path.pop(0)
380407

408+
381409
#
382410
# End graph-structured stack (GSS) classes.
383411
# ========================================================================
384412

385413

386414
class Glr(Lr):
387415
"""
388-
GLR parser. The Glr class uses a Spec instance in order to parse input
389-
that is fed to it via the token() method, and terminated via the eoi()
390-
method.
391-
"""
416+
GLR parser. The Glr class uses a Spec instance in order to parse input
417+
that is fed to it via the token() method, and terminated via the eoi()
418+
method."""
392419

393420
def __init__(self, spec):
394421
Lr.__init__(self, spec)
@@ -405,8 +432,7 @@ def reset(self):
405432

406433
def token(self, token):
407434
"""
408-
Feed a token to the parser.
409-
"""
435+
Feed a token to the parser."""
410436
if self._verbose:
411437
print("%s" % ("-" * 80))
412438
print("INPUT: %r" % token)
@@ -417,8 +443,7 @@ def token(self, token):
417443

418444
def eoi(self):
419445
"""
420-
Signal end-of-input to the parser.
421-
"""
446+
Signal end-of-input to the parser."""
422447
token = EndOfInput(self)
423448
self.token(token)
424449

@@ -468,33 +493,41 @@ def _reductions(self, sym, symSpec):
468493
if type(action) == ReduceAction:
469494
if len(action.production.rhs) == 0:
470495
if action.production not in epsilons:
471-
assert len(
472-
[path for path in top.paths(0)]) == 1
496+
assert (
497+
len([path for path in top.paths(0)]) == 1
498+
)
473499
path = [p for p in top.paths(0)][0]
474500
epsilons[action.production] = [top]
475501
workQ.append((path, action.production))
476502
if self._verbose:
477-
print(" --> enqueue(a) %r" %
478-
action.production)
503+
print(
504+
" --> enqueue(a) %r"
505+
% action.production
506+
)
479507
print(" %r" % path)
480508
elif top not in epsilons[action.production]:
481-
assert len(
482-
[path for path in top.paths(0)]) == 1
509+
assert (
510+
len([path for path in top.paths(0)]) == 1
511+
)
483512
path = [p for p in top.paths(0)][0]
484513
epsilons[action.production].append(top)
485514
workQ.append((path, action.production))
486515
if self._verbose:
487-
print(" --> enqueue(b) %r" %
488-
action.production)
516+
print(
517+
" --> enqueue(b) %r"
518+
% action.production
519+
)
489520
print(" %r" % path)
490521
else:
491522
# Iterate over all reduction paths through stack
492523
# and enqueue them.
493524
for path in top.paths(len(action.production.rhs)):
494525
workQ.append((path, action.production))
495526
if self._verbose:
496-
print(" --> enqueue(c) %r" %
497-
action.production)
527+
print(
528+
" --> enqueue(c) %r"
529+
% action.production
530+
)
498531
print(" %r" % path)
499532
i += 1
500533

@@ -526,8 +559,10 @@ def _reduce(self, workQ, epsilons, path, production, symSpec):
526559
below = path[0]
527560
done = False
528561
for top in self._gss:
529-
if top.nextState == \
530-
self._spec._goto[below.nextState][production.lhs]:
562+
if (
563+
top.nextState
564+
== self._spec._goto[below.nextState][production.lhs]
565+
):
531566
# top is compatible with the reduction result we want to add to
532567
# the set of stack tops.
533568
for edge in top.edges():
@@ -539,12 +574,18 @@ def _reduce(self, workQ, epsilons, path, production, symSpec):
539574
value = production.lhs.nontermType.merge(edge.value, r)
540575
if self._verbose:
541576
if value == edge.value:
542-
print(" %s" %
543-
("-" * len("%r" % edge.value)))
577+
print(
578+
" %s"
579+
% ("-" * len("%r" % edge.value))
580+
)
544581
else:
545-
print(" %s %s" %
546-
((" " * len("%r" % edge.value)),
547-
"-" * len("%r" % r)))
582+
print(
583+
" %s %s"
584+
% (
585+
(" " * len("%r" % edge.value)),
586+
"-" * len("%r" % r),
587+
)
588+
)
548589
edge.value = value
549590
done = True
550591
break
@@ -557,17 +598,21 @@ def _reduce(self, workQ, epsilons, path, production, symSpec):
557598
# Enqueue reduction paths that were created as a result of
558599
# the new link.
559600
self._enqueueLimitedReductions(
560-
workQ, epsilons, edge, symSpec)
601+
workQ, epsilons, edge, symSpec
602+
)
561603
done = True
562604
break
563605
if not done:
564606
# There is no compatible stack top, so create a new one.
565607
top = Gssn(
566-
below, r, self._spec._goto[below.nextState][production.lhs])
608+
below, r, self._spec._goto[below.nextState][production.lhs]
609+
)
567610
self._gss.append(top)
568611
if self._verbose:
569-
print(" --> shift(c) %r" %
570-
self._spec._goto[below.nextState][production.lhs])
612+
print(
613+
" --> shift(c) %r"
614+
% self._spec._goto[below.nextState][production.lhs]
615+
)
571616
self._enqueueLimitedReductions(workQ, epsilons, top.edge, symSpec)
572617

573618
# Enqueue paths that incorporate edge.
@@ -579,8 +624,10 @@ def _enqueueLimitedReductions(self, workQ, epsilons, edge, symSpec):
579624
for action in self._spec._action[top.nextState][symSpec]:
580625
if type(action) == ReduceAction:
581626
if len(action.production.rhs) == 0:
582-
if (gotos[top.nextState][action.production.lhs] ==
583-
top.nextState):
627+
if (
628+
gotos[top.nextState][action.production.lhs]
629+
== top.nextState
630+
):
584631
# Do nothing, since enqueueing a reduction
585632
# would result in performing the same reduction
586633
# twice.
@@ -590,16 +637,20 @@ def _enqueueLimitedReductions(self, workQ, epsilons, edge, symSpec):
590637
epsilons[action.production] = [top]
591638
workQ.append((path, action.production))
592639
if self._verbose:
593-
print(" --> enqueue(d) %r" %
594-
action.production)
640+
print(
641+
" --> enqueue(d) %r"
642+
% action.production
643+
)
595644
print(" %r" % path)
596645
elif top not in epsilons[action.production]:
597646
path = [top]
598647
epsilons[action.production].append(top)
599648
workQ.append((path, action.production))
600649
if self._verbose:
601-
print(" --> enqueue(e) %r" %
602-
action.production)
650+
print(
651+
" --> enqueue(e) %r"
652+
% action.production
653+
)
603654
print(" %r" % path)
604655
else:
605656
# Iterate over all reduction paths through stack
@@ -608,8 +659,10 @@ def _enqueueLimitedReductions(self, workQ, epsilons, edge, symSpec):
608659
if edge in path[1::2]:
609660
workQ.append((path, action.production))
610661
if self._verbose:
611-
print(" --> enqueue(f) %r" %
612-
action.production)
662+
print(
663+
" --> enqueue(f) %r"
664+
% action.production
665+
)
613666
print(" %r" % path)
614667

615668
def _shifts(self, sym, symSpec):
@@ -644,10 +697,10 @@ def _printStack(self):
644697
for top in self._gss:
645698
for path in top.paths():
646699
if i == 0:
647-
print("STK 0:", end=' ')
700+
print("STK 0:", end=" ")
648701
else:
649-
print(" %d:" % i, end=' ')
702+
print(" %d:" % i, end=" ")
650703
for elm in path:
651-
print("%r" % elm, end=' ')
704+
print("%r" % elm, end=" ")
652705
print()
653706
i += 1

‎parsing/ast.py‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -108,8 +108,8 @@ def merge(self, other):
108108
in merge().
109109
"""
110110
raise SyntaxError(
111-
"No merge() for %r; merging %r <--> %r" % (
112-
type(self), self, other))
111+
"No merge() for %r; merging %r <--> %r" % (type(self), self, other)
112+
)
113113

114114

115115
class Token(Symbol):
@@ -137,8 +137,7 @@ class rparen(Token):
137137
"%token [none]" # [none] not necessary, since it's the default.
138138
139139
class id(Token):
140-
"%token"
141-
"""
140+
"%token" """
142141

143142
def __init__(self, parser):
144143
assert is_parser(parser)

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