def _makeTryExceptSingleHandlerNode(provider, public_exc, tried,
exception_name, handler_body, source_ref):
# No need to create this in the first place if nothing is tried.
if tried is None:
return None
if public_exc:
preserver_id = provider.allocatePreserverId()
handling = [
StatementPreserveFrameException(preserver_id=preserver_id,
source_ref=source_ref),
StatementPublishException(source_ref=source_ref),
]
else:
handling = []
if not handler_body.isStatementsSequence():
handler_body = makeStatementsSequenceFromStatement(
statement=handler_body)
if not tried.isStatementsSequence():
tried = makeStatementsSequenceFromStatement(statement=tried)
handling.append(
makeStatementConditional(
condition=ExpressionComparisonExceptionMatch(
left=ExpressionCaughtExceptionTypeRef(source_ref=source_ref),
right=ExpressionBuiltinExceptionRef(
exception_name=exception_name, source_ref=source_ref),
source_ref=source_ref,
),
yes_branch=handler_body,
no_branch=makeReraiseExceptionStatement(source_ref=source_ref),
source_ref=source_ref,
))
if python_version >= 0x300 and public_exc:
handling = (makeTryFinallyStatement(
provider=provider,
tried=handling,
final=StatementRestoreFrameException(
preserver_id=preserver_id, source_ref=source_ref.atInternal()),
source_ref=source_ref.atInternal(),
), )
handling = makeStatementsSequenceFromStatements(*handling)
return StatementTry(
tried=tried,
except_handler=handling,
break_handler=None,
continue_handler=None,
return_handler=None,
source_ref=source_ref,
)
def makeTryExceptSingleHandlerNode(tried, exception_name, handler_body,
public_exc, source_ref):
if public_exc:
statements = [
StatementPreserveFrameException(
source_ref = source_ref.atInternal()
),
StatementPublishException(
source_ref = source_ref.atInternal()
)
]
else:
statements = []
statements.append(
StatementConditional(
condition = ExpressionComparisonExceptionMatch(
left = ExpressionCaughtExceptionTypeRef(
source_ref = source_ref
),
right = ExpressionBuiltinExceptionRef(
exception_name = exception_name,
source_ref = source_ref
),
source_ref = source_ref
),
yes_branch = handler_body,
no_branch = makeReraiseExceptionStatement(
source_ref = source_ref
),
source_ref = source_ref
)
)
if Utils.python_version >= 300 and public_exc:
statements = [
makeTryFinallyStatement(
tried = statements,
final = StatementRestoreFrameException(
source_ref = source_ref.atInternal()
),
source_ref = source_ref.atInternal()
)
]
return StatementTryExcept(
tried = tried,
handling = StatementsSequence(
statements = statements,
source_ref = source_ref
),
public_exc = public_exc,
source_ref = source_ref
)
def buildTryExceptionNode(provider, node, source_ref):
# Try/except nodes. Re-formulated as described in the developer
# manual. Exception handlers made the assignment to variables explicit. Same
# for the "del" as done for Python3. Also catches always work a tuple of
# exception types and hides away that they may be built or not.
# Many variables and branches, due to the re-formulation that is going on
# here, which just has the complexity, pylint: disable=R0912,R0914
tried = buildStatementsNode(
provider = provider,
nodes = node.body,
source_ref = source_ref
)
handlers = []
for handler in node.handlers:
exception_expression, exception_assign, exception_block = (
handler.type,
handler.name,
handler.body
)
if exception_assign is None:
statements = [
buildStatementsNode(
provider = provider,
nodes = exception_block,
source_ref = source_ref
)
]
elif Utils.python_version < 300:
statements = [
buildAssignmentStatements(
provider = provider,
node = exception_assign,
source = ExpressionCaughtExceptionValueRef(
source_ref = source_ref.atInternal()
),
source_ref = source_ref.atInternal()
),
buildStatementsNode(
provider = provider,
nodes = exception_block,
source_ref = source_ref
)
]
else:
target_info = decodeAssignTarget(
provider = provider,
node = exception_assign,
source_ref = source_ref,
)
# We didn't allow None, therefore it cannot be None, and
# the unpack is safe: pylint: disable=W0633
kind, detail = target_info
assert kind == "Name", kind
kind = "Name_Exception"
statements = [
buildAssignmentStatements(
provider = provider,
node = exception_assign,
source = ExpressionCaughtExceptionValueRef(
source_ref = source_ref.atInternal()
),
source_ref = source_ref.atInternal()
),
makeTryFinallyStatement(
tried = buildStatementsNode(
provider = provider,
nodes = exception_block,
source_ref = source_ref
),
final = buildDeleteStatementFromDecoded(
kind = kind,
detail = detail,
source_ref = source_ref
),
source_ref = source_ref
)
]
handler_body = makeStatementsSequence(
statements = statements,
allow_none = True,
source_ref = source_ref
)
exception_types = buildNode(
provider = provider,
node = exception_expression,
source_ref = source_ref,
allow_none = True
)
# The exception types should be a tuple, so as to be most general.
if exception_types is None:
if handler is not node.handlers[-1]:
SyntaxErrors.raiseSyntaxError(
reason = "default 'except:' must be last",
source_ref = source_ref.atLineNumber(
handler.lineno-1
if Options.isFullCompat() else
handler.lineno
)
)
handlers.append(
(
exception_types,
handler_body,
)
)
# Reraise by default
exception_handling = makeReraiseExceptionStatement(
source_ref = source_ref
)
for exception_type, handler in reversed(handlers):
if exception_type is None:
# A default handler was given, so use that indead.
exception_handling = handler
else:
exception_handling = StatementsSequence(
statements = (
StatementConditional(
condition = ExpressionComparisonExceptionMatch(
left = ExpressionCaughtExceptionTypeRef(
source_ref = exception_type.source_ref
),
right = exception_type,
source_ref = exception_type.source_ref
),
yes_branch = handler,
no_branch = exception_handling,
source_ref = exception_type.source_ref
),
),
source_ref = exception_type.source_ref
)
prelude = (
StatementPreserveFrameException(
source_ref = source_ref.atInternal()
),
StatementPublishException(
source_ref = source_ref.atInternal()
)
)
if exception_handling is None:
# For Python3, we need not publish at all, if all we do is to revert
# that immediately. For Python2, the publish may release previously
# published exception, which has side effects potentially.
if Utils.python_version < 300:
exception_handling = StatementsSequence(
statements = prelude,
source_ref = source_ref.atInternal()
)
public_exc = True
else:
public_exc = False
else:
public_exc = True
if Utils.python_version < 300:
exception_handling.setStatements(
prelude + exception_handling.getStatements()
)
else:
exception_handling = StatementsSequence(
statements = prelude + (
makeTryFinallyStatement(
tried = exception_handling,
final = StatementRestoreFrameException(
source_ref = source_ref.atInternal()
),
source_ref = source_ref
),
),
source_ref = source_ref.atInternal()
)
no_raise = buildStatementsNode(
provider = provider,
nodes = node.orelse,
source_ref = source_ref
)
if no_raise is None:
return StatementTryExcept(
tried = tried,
handling = exception_handling,
public_exc = public_exc,
source_ref = source_ref
)
else:
return makeTryExceptNoRaise(
provider = provider,
temp_scope = provider.allocateTempScope("try_except"),
handling = exception_handling,
tried = tried,
public_exc = public_exc,
no_raise = no_raise,
source_ref = source_ref
)
def buildTryExceptionNode(provider, node, source_ref):
# Try/except nodes. Re-formulated as described in the developer
# manual. Exception handlers made the assignment to variables explicit. Same
# for the "del" as done for Python3. Also catches always work a tuple of
# exception types and hides away that they may be built or not.
# Many variables and branches, due to the re-formulation that is going on
# here, which just has the complexity, pylint: disable=too-many-branches,too-many-locals
tried = buildStatementsNode(provider=provider,
nodes=node.body,
source_ref=source_ref)
handlers = []
for handler in node.handlers:
exception_expression, exception_assign, exception_block = (
handler.type,
handler.name,
handler.body,
)
if exception_assign is None:
statements = [
buildStatementsNode(provider=provider,
nodes=exception_block,
source_ref=source_ref)
]
elif python_version < 0x300:
statements = [
buildAssignmentStatements(
provider=provider,
node=exception_assign,
source=ExpressionCaughtExceptionValueRef(
source_ref=source_ref.atInternal()),
source_ref=source_ref.atInternal(),
),
buildStatementsNode(provider=provider,
nodes=exception_block,
source_ref=source_ref),
]
else:
# Python3 requires temporary assignment of exception assignment.
target_info = decodeAssignTarget(provider=provider,
node=exception_assign,
source_ref=source_ref)
kind, detail = target_info
assert kind == "Name", kind
kind = "Name_Exception"
statements = [
buildAssignmentStatements(
provider=provider,
node=exception_assign,
source=ExpressionCaughtExceptionValueRef(
source_ref=source_ref.atInternal()),
source_ref=source_ref.atInternal(),
),
makeTryFinallyStatement(
provider=provider,
tried=buildStatementsNode(provider=provider,
nodes=exception_block,
source_ref=source_ref),
final=buildDeleteStatementFromDecoded(
provider=provider,
kind=kind,
detail=detail,
source_ref=source_ref,
),
source_ref=source_ref,
),
]
handler_body = makeStatementsSequence(statements=statements,
allow_none=True,
source_ref=source_ref)
exception_types = buildNode(
provider=provider,
node=exception_expression,
source_ref=source_ref,
allow_none=True,
)
# The exception types should be a tuple, so as to be most general.
if exception_types is None:
if handler is not node.handlers[-1]:
raiseSyntaxError(
"default 'except:' must be last",
source_ref.atLineNumber(handler.lineno).atColumnNumber(
handler.col_offset),
)
handlers.append((exception_types, handler_body))
# Re-raise by default
exception_handling = makeReraiseExceptionStatement(source_ref=source_ref)
for exception_type, handler in reversed(handlers):
if exception_type is None:
# A default handler was given, so use that indeed.
exception_handling = handler
else:
exception_handling = StatementsSequence(
statements=(makeStatementConditional(
condition=ExpressionComparisonExceptionMatch(
left=ExpressionCaughtExceptionTypeRef(
source_ref=exception_type.source_ref),
right=exception_type,
source_ref=exception_type.source_ref,
),
yes_branch=handler,
no_branch=exception_handling,
source_ref=exception_type.source_ref,
), ),
source_ref=exception_type.source_ref,
)
if exception_handling is None:
# For Python3, we need not publish at all, if all we do is to revert
# that immediately. For Python2, the publish may release previously
# published exception, which has side effects potentially.
if python_version < 0x300:
exception_handling = StatementsSequence(
statements=(
StatementPreserveFrameException(
preserver_id=0, # unused with Python2
source_ref=source_ref.atInternal(),
),
StatementPublishException(
source_ref=source_ref.atInternal()),
),
source_ref=source_ref.atInternal(),
)
else:
if python_version < 0x300:
exception_handling.setChild(
"statements",
(
StatementPreserveFrameException(
preserver_id=0, # unused with Python2
source_ref=source_ref.atInternal(),
),
StatementPublishException(
source_ref=source_ref.atInternal()),
) + exception_handling.subnode_statements,
)
else:
preserver_id = provider.allocatePreserverId()
exception_handling = makeStatementsSequenceFromStatements(
StatementPreserveFrameException(
preserver_id=preserver_id,
source_ref=source_ref.atInternal()),
StatementPublishException(source_ref=source_ref.atInternal()),
makeTryFinallyStatement(
provider=provider,
tried=exception_handling,
final=StatementRestoreFrameException(
preserver_id=preserver_id,
source_ref=source_ref.atInternal()),
source_ref=source_ref,
),
)
no_raise = buildStatementsNode(provider=provider,
nodes=node.orelse,
source_ref=source_ref)
if no_raise is None:
if tried is None:
return None
return StatementTry(
tried=tried,
except_handler=exception_handling,
break_handler=None,
continue_handler=None,
return_handler=None,
source_ref=source_ref,
)
else:
if tried is None:
return no_raise
return makeTryExceptNoRaise(
provider=provider,
temp_scope=provider.allocateTempScope("try_except"),
handling=exception_handling,
tried=tried,
no_raise=no_raise,
source_ref=source_ref,
)