def buildLambdaNode(provider, node, source_ref): assert getKind(node) == "Lambda" parameters = buildParameterSpec(provider, "<lambda>", node, source_ref) function_body = ExpressionFunctionBody( provider=provider, name="<lambda>", doc=None, parameters=parameters, source_ref=source_ref, ) defaults = buildNodeList(provider, node.args.defaults, source_ref) kw_defaults = buildParameterKwDefaults(provider=provider, node=node, function_body=function_body, source_ref=source_ref) body = buildNode( provider=function_body, node=node.body, source_ref=source_ref, ) if function_body.isGenerator(): if Utils.python_version < 270: tmp_return_value = function_body.allocateTempVariable( temp_scope=None, name="yield_return") statements = (StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_return_value, source_ref=source_ref, ), source=body, source_ref=source_ref), StatementConditional( condition=ExpressionComparisonIsNOT( left=ExpressionTempVariableRef( variable=tmp_return_value, source_ref=source_ref, ), right=ExpressionConstantRef( constant=None, source_ref=source_ref), source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( statement=StatementExpressionOnly( expression=ExpressionYield( expression=ExpressionTempVariableRef( variable=tmp_return_value, source_ref=source_ref, ), source_ref=source_ref), source_ref=source_ref)), no_branch=None, source_ref=source_ref)) body = makeTryFinallyStatement(tried=statements, final=StatementReleaseVariable( variable=tmp_return_value, tolerant=True, source_ref=source_ref), source_ref=source_ref) else: body = StatementExpressionOnly(expression=body, source_ref=source_ref) else: body = StatementReturn(expression=body, source_ref=source_ref) body = StatementsFrame( statements=mergeStatements((body, )), guard_mode="generator" if function_body.isGenerator() else "full", var_names=parameters.getCoArgNames(), arg_count=parameters.getArgumentCount(), kw_only_count=parameters.getKwOnlyParameterCount(), has_starlist=parameters.getStarListArgumentName() is not None, has_stardict=parameters.getStarDictArgumentName() is not None, code_name="<lambda>", source_ref=body.getSourceReference()) body = makeStatementsSequenceFromStatement(statement=body, ) function_body.setBody(body) annotations = buildParameterAnnotations(provider, node, source_ref) return ExpressionFunctionCreation(function_ref=ExpressionFunctionRef( function_body=function_body, source_ref=source_ref), defaults=defaults, kw_defaults=kw_defaults, annotations=annotations, source_ref=source_ref)
def buildParseTree(provider, source_code, source_ref, is_module, is_main): # There are a bunch of branches here, mostly to deal with version # differences for module default variables. pylint: disable=R0912 # Workaround: ast.parse cannot cope with some situations where a file is not # terminated by a new line. if not source_code.endswith('\n'): source_code = source_code + '\n' try: body = ast.parse(source_code, source_ref.getFilename()) except SyntaxError as e: _makeSyntaxErrorCompatible(e) raise e assert getKind(body) == "Module" line_offset = source_ref.getLineNumber() - 1 if line_offset > 0: for created_node in ast.walk(body): if hasattr(created_node, "lineno"): created_node.lineno += line_offset body, doc = extractDocFromBody(body) result = buildStatementsNode( provider = provider, nodes = body, source_ref = source_ref ) checkFutureImportsOnlyAtStart(body) internal_source_ref = source_ref.atInternal() statements = [] if is_module: # Add import of "site" module of main programs visibly in the node tree, # so recursion and optimization can pick it up, checking its effects. if is_main and not sys.flags.no_site: statements.append( StatementExpressionOnly( expression = ExpressionImportModule( module_name = "site", import_list = (), level = 0, source_ref = source_ref, ), source_ref = source_ref ) ) statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__doc__", source_ref = internal_source_ref ), source = ExpressionConstantRef( constant = doc, source_ref = internal_source_ref, user_provided = True ), source_ref = internal_source_ref ) ) statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__file__", source_ref = internal_source_ref ), source = ExpressionModuleFileAttributeRef( source_ref = internal_source_ref, ), source_ref = internal_source_ref ) ) if provider.isPythonPackage(): # This assigns "__path__" value. statements.append( createPathAssignment(internal_source_ref) ) if Utils.python_version >= 300: statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__cached__", source_ref = internal_source_ref ), source = ExpressionConstantRef( constant = None, source_ref = internal_source_ref, user_provided = True ), source_ref = internal_source_ref ) ) if Utils.python_version >= 330: # For Python3.3, it's set for both packages and non-packages. statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__package__", source_ref = internal_source_ref ), source = ExpressionConstantRef( constant = provider.getFullName() if provider.isPythonPackage() else provider.getPackage(), source_ref = internal_source_ref, user_provided = True ), source_ref = internal_source_ref ) ) needs__initializing__ = not provider.isMainModule() and \ (Utils.python_version >= 330 and Utils.python_version < 340) if needs__initializing__: # Set "__initializing__" at the beginning to True statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__initializing__", source_ref = internal_source_ref ), source = ExpressionConstantRef( constant = True, source_ref = internal_source_ref, user_provided = True ), source_ref = internal_source_ref ) ) # Now the module body if there is any at all. if result is not None: statements.extend( result.getStatements() ) if needs__initializing__: # Set "__initializing__" at the end to False statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__initializing__", source_ref = internal_source_ref ), source = ExpressionConstantRef( constant = False, source_ref = internal_source_ref, user_provided = True ), source_ref = internal_source_ref ) ) if is_module: result = makeModuleFrame( module = provider, statements = statements, source_ref = source_ref ) applyLaterWrappers() return result else: assert False
def buildListContractionNode(provider, node, source_ref): # List contractions are dealt with by general code. if Utils.python_version < 300: temp_scope = provider.allocateTempScope("listcontr") outer_iter_var = provider.allocateTempVariable(temp_scope=temp_scope, name="listcontr_iter") outer_iter_ref = ExpressionTempVariableRef( variable=outer_iter_var.makeReference(provider), source_ref=source_ref) container_tmp = provider.allocateTempVariable(temp_scope=temp_scope, name="listcontr_result") statements, del_statements = _buildContractionBodyNode( provider=provider, node=node, emit_class=ExpressionListOperationAppend, start_value=ExpressionConstantRef(constant=[], source_ref=source_ref), outer_iter_ref=outer_iter_ref, container_tmp=container_tmp, temp_scope=temp_scope, assign_provider=True, source_ref=source_ref, function_body=provider) statements.insert( 0, StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=outer_iter_var.makeReference(provider), source_ref=source_ref), source=ExpressionBuiltinIter1(value=buildNode( provider=provider, node=node.generators[0].iter, source_ref=source_ref), source_ref=source_ref), source_ref=source_ref)) result = makeTryFinallyExpression(expression=ExpressionTempVariableRef( variable=container_tmp.makeReference(provider), source_ref=source_ref), tried=statements, final=del_statements, source_ref=source_ref) final = StatementsSequence(statements=( StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=container_tmp.makeReference(provider), source_ref=source_ref), tolerant=True, source_ref=source_ref), StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=outer_iter_var.makeReference(provider), source_ref=source_ref), tolerant=True, source_ref=source_ref), ), source_ref=source_ref) wrapTryFinallyLater(node=result, final=final) return result return _buildContractionNode( provider=provider, node=node, name="<listcontraction>", emit_class=ExpressionListOperationAppend, start_value=ExpressionConstantRef(constant=[], source_ref=source_ref), # Note: For Python3, the list contractions no longer assign to the outer # scope. assign_provider=Utils.python_version < 300, source_ref=source_ref)
def makeTryExceptNoRaise(provider, temp_scope, tried, handling, no_raise, public_exc, source_ref): # This helper executes the core re-formulation of "no_raise" blocks, which # are the "else" blocks of "try"/"except" statements. In order to limit the # execution, we use an indicator variable instead, which will signal that # the tried block executed up to the end. And then we make the else block be # a conditional statement checking that. assert no_raise is not None tmp_handler_indicator_variable = provider.allocateTempVariable( temp_scope = temp_scope, name = "unhandled_indicator" ) statements = mergeStatements( ( StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_handler_indicator_variable, source_ref = source_ref.atInternal() ), source = ExpressionConstantRef( constant = False, source_ref = source_ref ), source_ref = no_raise.getSourceReference().atInternal() ), handling ), allow_none = True ) handling = StatementsSequence( statements = statements, source_ref = source_ref ) tried = ( StatementTryExcept( tried = tried, handling = handling, public_exc = public_exc, source_ref = source_ref ), StatementConditional( condition = ExpressionComparisonIs( left = ExpressionTempVariableRef( variable = tmp_handler_indicator_variable, source_ref = source_ref ), right = ExpressionConstantRef( constant = True, source_ref = source_ref ), source_ref = source_ref ), yes_branch = no_raise, no_branch = None, source_ref = source_ref ) ) final = StatementReleaseVariable( variable = tmp_handler_indicator_variable, tolerant = False, source_ref = source_ref.atInternal() ), return StatementsSequence( statements = ( StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_handler_indicator_variable, source_ref = source_ref.atInternal() ), source = ExpressionConstantRef( constant = True, source_ref = source_ref ), source_ref = source_ref.atInternal() ), makeTryFinallyStatement( tried = tried, final = final, source_ref = source_ref ) ), source_ref = source_ref )
def buildImportModulesNode(provider, node, source_ref): # Import modules statement. As described in the developer manual, these # statements can be treated as several ones. import_names = [ ( import_desc.name, import_desc.asname ) for import_desc in node.names ] import_nodes = [] for import_desc in import_names: module_name, local_name = import_desc module_topname = module_name.split('.')[0] # Note: The "level" of import is influenced by the future absolute # imports. level = 0 if source_ref.getFutureSpec().isAbsoluteImport() else -1 if local_name: # If is gets a local name, the real name must be used as a # temporary value only, being looked up recursively. import_node = ExpressionImportModule( module_name = module_name, import_list = None, level = level, source_ref = source_ref ) for import_name in module_name.split('.')[1:]: import_node = ExpressionImportName( module = import_node, import_name = import_name, source_ref = source_ref ) else: import_node = ExpressionImportModule( module_name = module_name, import_list = None, level = level, source_ref = source_ref ) # If a name was given, use the one provided, otherwise the import gives # the top level package name given for assignment of the imported # module. import_nodes.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = mangleName( local_name if local_name is not None else module_topname, provider ), source_ref = source_ref ), source = import_node, source_ref = source_ref ) ) # Note: Each import is sequential. It will potentially succeed, and the # failure of a later one is not changing that one bit . We can therefore # have a sequence of imports that only import one thing therefore. return makeStatementsSequenceOrStatement( statements = import_nodes, source_ref = source_ref )
def buildClassNode3(provider, node, source_ref): # Many variables, due to the huge re-formulation that is going on here, # which just has the complexity and optimization checks: # pylint: disable=I0021,too-many-branches,too-many-locals,too-many-statements # This function is the Python3 special case with special re-formulation as # according to developer manual. class_statement_nodes, class_doc = extractDocFromBody(node) # We need a scope for the temporary variables, and they might be closured. temp_scope = provider.allocateTempScope(name="class_creation") tmp_class_decl_dict = provider.allocateTempVariable( temp_scope=temp_scope, name="class_decl_dict" ) tmp_metaclass = provider.allocateTempVariable( temp_scope=temp_scope, name="metaclass" ) tmp_prepared = provider.allocateTempVariable(temp_scope=temp_scope, name="prepared") class_creation_function = ExpressionClassBody( provider=provider, name=node.name, doc=class_doc, source_ref=source_ref ) class_variable = class_creation_function.getVariableForAssignment("__class__") class_variable_ref = ExpressionVariableRef( variable=class_variable, source_ref=source_ref ) parent_module = provider.getParentModule() code_object = CodeObjectSpec( co_name=node.name, co_kind="Class", co_varnames=(), co_argcount=0, co_posonlyargcount=0, co_kwonlyargcount=0, co_has_starlist=False, co_has_stardict=False, co_filename=parent_module.getRunTimeFilename(), co_lineno=source_ref.getLineNumber(), future_spec=parent_module.getFutureSpec(), ) body = buildFrameNode( provider=class_creation_function, nodes=class_statement_nodes, code_object=code_object, source_ref=source_ref, ) source_ref_orig = source_ref if body is not None: # The frame guard has nothing to tell its line number to. body.source_ref = source_ref locals_scope = class_creation_function.getFunctionLocalsScope() statements = [ StatementSetLocals( locals_scope=locals_scope, new_locals=ExpressionTempVariableRef( variable=tmp_prepared, source_ref=source_ref ), source_ref=source_ref, ), StatementAssignmentVariableName( provider=class_creation_function, variable_name="__module__", source=ExpressionModuleAttributeNameRef( variable=provider.getParentModule().getVariableForReference("__name__"), source_ref=source_ref, ), source_ref=source_ref, ), ] if class_doc is not None: statements.append( StatementAssignmentVariableName( provider=class_creation_function, variable_name="__doc__", source=makeConstantRefNode( constant=class_doc, source_ref=source_ref, user_provided=True ), source_ref=source_ref, ) ) # The "__qualname__" attribute is new in Python 3.3. if python_version >= 300: qualname = class_creation_function.getFunctionQualname() if python_version < 340: qualname_ref = makeConstantRefNode( constant=qualname, source_ref=source_ref, user_provided=True ) else: qualname_ref = ExpressionFunctionQualnameRef( function_body=class_creation_function, source_ref=source_ref ) statements.append( StatementLocalsDictOperationSet( locals_scope=locals_scope, variable_name="__qualname__", value=qualname_ref, source_ref=source_ref, ) ) if python_version >= 340: qualname_assign = statements[-1] if python_version >= 360 and class_creation_function.needsAnnotationsDictionary(): statements.append( StatementLocalsDictOperationSet( locals_scope=locals_scope, variable_name="__annotations__", value=makeConstantRefNode( constant={}, source_ref=source_ref, user_provided=True ), source_ref=source_ref, ) ) statements.append(body) if node.bases: tmp_bases = provider.allocateTempVariable(temp_scope=temp_scope, name="bases") if python_version >= 370: tmp_bases_orig = provider.allocateTempVariable( temp_scope=temp_scope, name="bases_orig" ) def makeBasesRef(): return ExpressionTempVariableRef(variable=tmp_bases, source_ref=source_ref) else: def makeBasesRef(): return makeConstantRefNode(constant=(), source_ref=source_ref) if python_version >= 370 and node.bases: statements.append( makeStatementConditional( condition=makeComparisonExpression( comparator="NotEq", left=ExpressionTempVariableRef( variable=tmp_bases, source_ref=source_ref ), right=ExpressionTempVariableRef( variable=tmp_bases_orig, source_ref=source_ref ), source_ref=source_ref, ), yes_branch=StatementLocalsDictOperationSet( locals_scope=locals_scope, variable_name="__orig_bases__", value=ExpressionTempVariableRef( variable=tmp_bases_orig, source_ref=source_ref ), source_ref=source_ref, ), no_branch=None, source_ref=source_ref, ) ) statements += ( StatementAssignmentVariable( variable=class_variable, source=makeExpressionCall( called=ExpressionTempVariableRef( variable=tmp_metaclass, source_ref=source_ref ), args=makeSequenceCreationOrConstant( sequence_kind="tuple", elements=( makeConstantRefNode( constant=node.name, source_ref=source_ref, user_provided=True, ), makeBasesRef(), ExpressionBuiltinLocalsRef( locals_scope=locals_scope, source_ref=source_ref ), ), source_ref=source_ref, ), kw=ExpressionTempVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), source_ref=source_ref, ), source_ref=source_ref, ), StatementReturn(expression=class_variable_ref, source_ref=source_ref), ) body = makeStatementsSequenceFromStatement( statement=makeTryFinallyStatement( provider=class_creation_function, tried=mergeStatements(statements, True), final=StatementReleaseLocals( locals_scope=locals_scope, source_ref=source_ref ), source_ref=source_ref, ) ) # The class body is basically a function that implicitly, at the end # returns its locals and cannot have other return statements contained. class_creation_function.setBody(body) # The class body is basically a function that implicitly, at the end # returns its created class and cannot have other return statements # contained. decorated_body = class_creation_function for decorator in buildNodeList(provider, reversed(node.decorator_list), source_ref): decorated_body = makeExpressionCall( called=decorator, args=ExpressionMakeTuple(elements=(decorated_body,), source_ref=source_ref), kw=None, source_ref=decorator.getSourceReference(), ) if node.keywords and node.keywords[-1].arg is None: keywords = node.keywords[:-1] else: keywords = node.keywords statements = [] if node.bases: statements.append( StatementAssignmentVariable( variable=tmp_bases if python_version < 370 else tmp_bases_orig, source=buildTupleCreationNode( provider=provider, elements=node.bases, source_ref=source_ref ), source_ref=source_ref, ) ) if python_version >= 370: bases_conversion = ExpressionFunctionCall( function=ExpressionFunctionCreation( function_ref=ExpressionFunctionRef( function_body=getClassBasesMroConversionHelper(), source_ref=source_ref, ), defaults=(), kw_defaults=None, annotations=None, source_ref=source_ref, ), values=( ExpressionTempVariableRef( variable=tmp_bases_orig, source_ref=source_ref ), ), source_ref=source_ref, ) statements.append( StatementAssignmentVariable( variable=tmp_bases, source=bases_conversion, source_ref=source_ref ) ) statements.append( StatementAssignmentVariable( variable=tmp_class_decl_dict, source=makeDictCreationOrConstant2( keys=[keyword.arg for keyword in keywords], values=[ buildNode(provider, keyword.value, source_ref) for keyword in keywords ], source_ref=source_ref, ), source_ref=source_ref, ) ) if node.keywords and node.keywords[-1].arg is None: statements.append( StatementDictOperationUpdate( dict_arg=ExpressionVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), value=buildNode(provider, node.keywords[-1].value, source_ref), source_ref=source_ref, ) ) # Check if there are bases, and if there are, go with the type of the # first base class as a metaclass unless it was specified in the class # decl dict of course. if node.bases: unspecified_metaclass_expression = ExpressionBuiltinType1( value=ExpressionSubscriptLookup( expression=ExpressionTempVariableRef( variable=tmp_bases, source_ref=source_ref ), subscript=makeConstantRefNode( constant=0, source_ref=source_ref, user_provided=True ), source_ref=source_ref, ), source_ref=source_ref, ) # Might become empty behind our back during conversion, therefore make the # check at run time for 3.7 or higher. if python_version >= 370: unspecified_metaclass_expression = ExpressionConditional( condition=ExpressionTempVariableRef( variable=tmp_bases, source_ref=source_ref ), expression_yes=unspecified_metaclass_expression, expression_no=makeExpressionBuiltinRef( builtin_name="type", source_ref=source_ref ), source_ref=source_ref, ) else: unspecified_metaclass_expression = makeExpressionBuiltinRef( builtin_name="type", source_ref=source_ref ) call_prepare = StatementAssignmentVariable( variable=tmp_prepared, source=makeExpressionCall( called=ExpressionAttributeLookup( expression=ExpressionTempVariableRef( variable=tmp_metaclass, source_ref=source_ref ), attribute_name="__prepare__", source_ref=source_ref, ), args=ExpressionMakeTuple( elements=( makeConstantRefNode( constant=node.name, source_ref=source_ref, user_provided=True ), makeBasesRef(), ), source_ref=source_ref, ), kw=ExpressionTempVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), source_ref=source_ref, ), source_ref=source_ref, ) if python_version >= 364: call_prepare = makeStatementsSequenceFromStatements( call_prepare, makeStatementConditional( condition=ExpressionAttributeCheck( object_arg=ExpressionTempVariableRef( variable=tmp_prepared, source_ref=source_ref ), attribute_name="__getitem__", source_ref=source_ref, ), yes_branch=None, no_branch=makeRaiseExceptionExpressionFromTemplate( exception_type="TypeError", template="%s.__prepare__() must return a mapping, not %s", template_args=( ExpressionBuiltinGetattr( object_arg=ExpressionTempVariableRef( variable=tmp_metaclass, source_ref=source_ref ), name=makeConstantRefNode( constant="__name__", source_ref=source_ref ), default=makeConstantRefNode( constant="<metaclass>", source_ref=source_ref ), source_ref=source_ref, ), ExpressionAttributeLookup( expression=ExpressionBuiltinType1( value=ExpressionTempVariableRef( variable=tmp_prepared, source_ref=source_ref ), source_ref=source_ref, ), attribute_name="__name__", source_ref=source_ref, ), ), source_ref=source_ref, ).asStatement(), source_ref=source_ref, ), ) statements += ( StatementAssignmentVariable( variable=tmp_metaclass, source=ExpressionSelectMetaclass( metaclass=ExpressionConditional( condition=ExpressionDictOperationIn( key=makeConstantRefNode( constant="metaclass", source_ref=source_ref, user_provided=True, ), dict_arg=ExpressionTempVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), source_ref=source_ref, ), expression_yes=ExpressionDictOperationGet( dict_arg=ExpressionTempVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), key=makeConstantRefNode( constant="metaclass", source_ref=source_ref, user_provided=True, ), source_ref=source_ref, ), expression_no=unspecified_metaclass_expression, source_ref=source_ref, ), bases=makeBasesRef(), source_ref=source_ref, ), source_ref=source_ref_orig, ), makeStatementConditional( condition=ExpressionDictOperationIn( key=makeConstantRefNode( constant="metaclass", source_ref=source_ref, user_provided=True ), dict_arg=ExpressionTempVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), source_ref=source_ref, ), no_branch=None, yes_branch=StatementDictOperationRemove( dict_arg=ExpressionTempVariableRef( variable=tmp_class_decl_dict, source_ref=source_ref ), key=makeConstantRefNode( constant="metaclass", source_ref=source_ref, user_provided=True ), source_ref=source_ref, ), source_ref=source_ref, ), makeStatementConditional( condition=ExpressionAttributeCheck( object_arg=ExpressionTempVariableRef( variable=tmp_metaclass, source_ref=source_ref ), attribute_name="__prepare__", source_ref=source_ref, ), yes_branch=call_prepare, no_branch=StatementAssignmentVariable( variable=tmp_prepared, source=makeConstantRefNode( constant={}, source_ref=source_ref, user_provided=True ), source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentVariableName( provider=provider, variable_name=mangleName(node.name, provider), source=decorated_body, source_ref=source_ref, ), ) if python_version >= 340: class_creation_function.qualname_setup = node.name, qualname_assign final = [tmp_class_decl_dict, tmp_metaclass, tmp_prepared] if node.bases: final.insert(0, tmp_bases) if python_version >= 370: final.insert(0, tmp_bases_orig) return makeTryFinallyStatement( provider=provider, tried=statements, final=tuple( StatementReleaseVariable(variable=variable, source_ref=source_ref) for variable in final ), source_ref=source_ref, )
def buildPrintNode(provider, node, source_ref): # "print" statements, should only occur with Python2. if node.dest is not None: temp_scope = provider.allocateTempScope("print") tmp_target_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="target") target_default_statement = StatementAssignmentVariable( variable=tmp_target_variable, source=makeExpressionImportModuleNameHard(module_name="sys", import_name="stdout", source_ref=source_ref), source_ref=source_ref, ) statements = [ StatementAssignmentVariable( variable=tmp_target_variable, source=buildNode(provider=provider, node=node.dest, source_ref=source_ref), source_ref=source_ref, ), makeStatementConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef( variable=tmp_target_variable, source_ref=source_ref), right=ExpressionConstantNoneRef(source_ref=source_ref), source_ref=source_ref, ), yes_branch=target_default_statement, no_branch=None, source_ref=source_ref, ), ] values = buildNodeList(provider=provider, nodes=node.values, source_ref=source_ref) if node.dest is not None: print_statements = [ StatementPrintValue( dest=ExpressionTempVariableRef(variable=tmp_target_variable, source_ref=source_ref), value=value, source_ref=source_ref, ) for value in values ] if node.nl: print_statements.append( StatementPrintNewline( dest=ExpressionTempVariableRef( variable=tmp_target_variable, source_ref=source_ref), source_ref=source_ref, )) statements.append( makeTryFinallyStatement( provider=provider, tried=print_statements, final=StatementReleaseVariable(variable=tmp_target_variable, source_ref=source_ref), source_ref=source_ref, )) else: statements = [ StatementPrintValue(dest=None, value=value, source_ref=source_ref) for value in values ] if node.nl: statements.append( StatementPrintNewline(dest=None, source_ref=source_ref)) return makeStatementsSequenceFromStatements(*statements)
def buildCallNode(provider, node, source_ref): called = buildNode(provider, node.func, source_ref) if python_version >= 0x350: list_star_arg = None dict_star_arg = None positional_args = [] # For Python3.5 compatibility, the error handling with star argument last # is the old one, only with a starred argument before that, things use the # new unpacking code. for node_arg in node.args[:-1]: if getKind(node_arg) == "Starred": assert python_version >= 0x350 list_star_arg = buildListUnpacking(provider, node.args, source_ref) positional_args = [] break else: if node.args and getKind(node.args[-1]) == "Starred": assert python_version >= 0x350 list_star_arg = buildNode(provider, node.args[-1].value, source_ref) positional_args = buildNodeList(provider, node.args[:-1], source_ref) else: positional_args = buildNodeList(provider, node.args, source_ref) # Only the values of keyword pairs have a real source ref, and those only # really matter, so that makes sense. keys = [] values = [] for keyword in node.keywords[:-1]: if keyword.arg is None: assert python_version >= 0x350 outline_body = ExpressionOutlineBody( provider=provider, name="dict_unpacking_call", source_ref=source_ref ) tmp_called = outline_body.allocateTempVariable( temp_scope=None, name="called" ) helper_args = [ ExpressionTempVariableRef(variable=tmp_called, source_ref=source_ref), makeExpressionMakeTuple( elements=buildDictionaryUnpackingArgs( provider=provider, keys=(keyword.arg for keyword in node.keywords), values=(keyword.value for keyword in node.keywords), source_ref=source_ref, ), source_ref=source_ref, ), ] dict_star_arg = ExpressionFunctionCall( function=ExpressionFunctionCreation( function_ref=ExpressionFunctionRef( function_body=getFunctionCallHelperDictionaryUnpacking(), source_ref=source_ref, ), defaults=(), kw_defaults=None, annotations=None, source_ref=source_ref, ), values=helper_args, source_ref=source_ref, ) outline_body.setChild( "body", makeStatementsSequenceFromStatements( StatementAssignmentVariable( variable=tmp_called, source=called, source_ref=source_ref ), StatementReturn( expression=_makeCallNode( called=ExpressionTempVariableRef( variable=tmp_called, source_ref=source_ref ), positional_args=positional_args, keys=keys, values=values, list_star_arg=list_star_arg, dict_star_arg=dict_star_arg, source_ref=source_ref, ), source_ref=source_ref, ), ), ) return outline_body # For Python3.5 compatibility, the error handling with star argument last # is the old one, only with a starred argument before that, things use the # new unpacking code. if node.keywords and node.keywords[-1].arg is None: assert python_version >= 0x350 dict_star_arg = buildNode(provider, node.keywords[-1].value, source_ref) keywords = node.keywords[:-1] else: keywords = node.keywords for keyword in keywords: keys.append( makeConstantRefNode( constant=keyword.arg, source_ref=source_ref, user_provided=True ) ) values.append(buildNode(provider, keyword.value, source_ref)) if python_version < 0x350: list_star_arg = buildNode(provider, node.starargs, source_ref, True) dict_star_arg = buildNode(provider, node.kwargs, source_ref, True) return _makeCallNode( called=called, positional_args=positional_args, keys=keys, values=values, list_star_arg=list_star_arg, dict_star_arg=dict_star_arg, source_ref=source_ref, )
def buildExecNode(provider, node, source_ref): # "exec" statements, should only occur with Python2. exec_globals = node.globals exec_locals = node.locals body = node.body orig_globals = exec_globals # Handle exec(a,b,c) to be same as exec a, b, c if exec_locals is None and exec_globals is None and \ getKind(body) == "Tuple": parts = body.elts body = parts[0] if len(parts) > 1: exec_globals = parts[1] if len(parts) > 2: exec_locals = parts[2] else: return StatementRaiseException( exception_type=ExpressionBuiltinExceptionRef( exception_name="TypeError", source_ref=source_ref), exception_value=ExpressionConstantRef(constant="""\ exec: arg 1 must be a string, file, or code object""", source_ref=source_ref), exception_trace=None, exception_cause=None, source_ref=source_ref) if provider.isExpressionFunctionBody(): provider.markAsExecContaining() if orig_globals is None: provider.markAsUnqualifiedExecContaining(source_ref) temp_scope = provider.allocateTempScope("exec") globals_ref, locals_ref, tried, final = wrapEvalGlobalsAndLocals( provider=provider, globals_node=buildNode(provider, exec_globals, source_ref, True), locals_node=buildNode(provider, exec_locals, source_ref, True), temp_scope=temp_scope, source_ref=source_ref) source_code = buildNode(provider, body, source_ref) source_variable = provider.allocateTempVariable(temp_scope=temp_scope, name="source") # Source needs some special treatment for eval, if it's a string, it # must be stripped. file_fixup = [ StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=source_variable.makeReference(provider), source_ref=source_ref), source=ExpressionCallEmpty(called=ExpressionAttributeLookup( expression=ExpressionTempVariableRef( variable=source_variable.makeReference(provider), source_ref=source_ref), attribute_name="read", source_ref=source_ref), source_ref=source_ref), source_ref=source_ref) ] statements = (StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=source_variable.makeReference(provider), source_ref=source_ref), source=source_code, source_ref=source_ref, ), StatementConditional(condition=ExpressionBuiltinIsinstance( cls=ExpressionBuiltinAnonymousRef( builtin_name="file", source_ref=source_ref, ), instance=ExpressionTempVariableRef( variable=source_variable.makeReference(provider), source_ref=source_ref), source_ref=source_ref), yes_branch=StatementsSequence( statements=file_fixup, source_ref=source_ref), no_branch=None, source_ref=source_ref), StatementExec(source_code=ExpressionTempVariableRef( variable=source_variable.makeReference(provider), source_ref=source_ref), globals_arg=globals_ref, locals_arg=locals_ref, source_ref=source_ref)) tried.setChild("statements", tried.getStatements() + statements) final.setStatements(final.getStatements() + ( StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=source_variable.makeReference(provider), source_ref=source_ref), tolerant=True, source_ref=source_ref), )) return StatementTryFinally(tried=tried, final=final, public_exc=False, source_ref=source_ref)
def _buildContractionBodyNode(provider, node, emit_class, start_value, container_tmp, iter_tmp, temp_scope, assign_provider, function_body, source_ref): # This uses lots of variables and branches. There is no good way # around that, and we deal with many cases, due to having generator # expressions sharing this code, pylint: disable=too-many-branches,too-many-locals # Note: The assign_provider is only to cover Python2 list contractions, # assigning one of the loop variables to the outside scope. tmp_variables = [] if emit_class is not ExpressionYield: tmp_variables.append(iter_tmp) if container_tmp is not None: tmp_variables.append(container_tmp) # First assign the iterator if we are an outline. if assign_provider: statements = [ StatementAssignmentVariable(variable=iter_tmp, source=_makeIteratorCreation( provider, node.generators[0], source_ref), source_ref=source_ref.atInternal()) ] else: statements = [] if start_value is not None: statements.append( StatementAssignmentVariable(variable=container_tmp, source=makeConstantRefNode( constant=start_value, source_ref=source_ref), source_ref=source_ref.atInternal())) if hasattr(node, "elt"): if start_value is not None: current_body = emit_class( ExpressionTempVariableRef(variable=container_tmp, source_ref=source_ref), buildNode(provider=function_body if not assign_provider else provider, node=node.elt, source_ref=source_ref), source_ref=source_ref) else: assert emit_class is ExpressionYield current_body = emit_class(buildNode(provider=function_body, node=node.elt, source_ref=source_ref), source_ref=source_ref) else: assert emit_class is StatementDictOperationSet current_body = StatementDictOperationSet( dict_arg=ExpressionTempVariableRef(variable=container_tmp, source_ref=source_ref), key=buildNode( provider=function_body if not assign_provider else provider, node=node.key, source_ref=source_ref, ), value=buildNode( provider=function_body if not assign_provider else provider, node=node.value, source_ref=source_ref, ), source_ref=source_ref) if current_body.isExpression(): current_body = StatementExpressionOnly(expression=current_body, source_ref=source_ref) for count, qual in enumerate(reversed(node.generators)): tmp_value_variable = function_body.allocateTempVariable( temp_scope=temp_scope, name="iter_value_%d" % count) tmp_variables.append(tmp_value_variable) # The first iterated value is to be calculated outside of the function # and will be given as a parameter "_iterated", the others are built # inside the function. if qual is node.generators[0]: iterator_ref = makeVariableRefNode(variable=iter_tmp, source_ref=source_ref) tmp_iter_variable = None nested_statements = [] else: # First create the iterator and store it, next should be loop body value_iterator = _makeIteratorCreation( provider=provider if assign_provider else function_body, qual=qual, source_ref=source_ref) tmp_iter_variable = function_body.allocateTempVariable( temp_scope=temp_scope, name="contraction_iter_%d" % count) tmp_variables.append(tmp_iter_variable) nested_statements = [ StatementAssignmentVariable(variable=tmp_iter_variable, source=value_iterator, source_ref=source_ref) ] iterator_ref = ExpressionTempVariableRef( variable=tmp_iter_variable, source_ref=source_ref) loop_statements = [ makeTryExceptSingleHandlerNode( tried=StatementAssignmentVariable( variable=tmp_value_variable, source=_makeIteratorNext(iterator_ref=iterator_ref, qual=qual, source_ref=source_ref), source_ref=source_ref), exception_name=_getStopIterationName(qual), handler_body=StatementLoopBreak(source_ref=source_ref), source_ref=source_ref), buildAssignmentStatements( provider=provider if assign_provider else function_body, temp_provider=function_body, node=qual.target, source=ExpressionTempVariableRef(variable=tmp_value_variable, source_ref=source_ref), source_ref=source_ref) ] conditions = buildNodeList( provider=provider if assign_provider else function_body, nodes=qual.ifs, source_ref=source_ref) if len(conditions) >= 1: loop_statements.append( makeStatementConditional(condition=buildAndNode( values=conditions, source_ref=source_ref), yes_branch=current_body, no_branch=None, source_ref=source_ref)) else: loop_statements.append(current_body) nested_statements.append( StatementLoop(body=StatementsSequence( statements=mergeStatements(loop_statements), source_ref=source_ref), source_ref=source_ref)) if tmp_iter_variable is not None: nested_statements.append( StatementReleaseVariable(variable=tmp_iter_variable, source_ref=source_ref)) current_body = StatementsSequence(statements=mergeStatements( nested_statements, False), source_ref=source_ref) statements.append(current_body) statements = mergeStatements(statements) release_statements = [ StatementReleaseVariable(variable=tmp_variable, source_ref=source_ref) for tmp_variable in tmp_variables ] return statements, release_statements
def _buildContractionNode(provider, node, name, emit_class, start_value, source_ref): # The contraction nodes are reformulated to function bodies, with loops as # described in the developer manual. They use a lot of temporary names, # nested blocks, etc. and so a lot of variable names. function_body = ExpressionOutlineFunction(provider=provider, name=intern(name[1:-1]), source_ref=source_ref) iter_tmp = function_body.allocateTempVariable(temp_scope=None, name=".0") container_tmp = function_body.allocateTempVariable(temp_scope=None, name="contraction") statements, release_statements = _buildContractionBodyNode( function_body=function_body, provider=provider, node=node, emit_class=emit_class, iter_tmp=iter_tmp, temp_scope=None, start_value=start_value, container_tmp=container_tmp, assign_provider=False, source_ref=source_ref, ) assign_iter_statement = StatementAssignmentVariable( source=_makeIteratorCreation(provider, node.generators[0], source_ref), variable=iter_tmp, source_ref=source_ref) statements.append( StatementReturn(expression=ExpressionTempVariableRef( variable=container_tmp, source_ref=source_ref), source_ref=source_ref)) statements = (makeTryFinallyStatement( provider=function_body, tried=statements, final=release_statements, source_ref=source_ref.atInternal()), ) if python_version < 300: body = makeStatementsSequenceFromStatements(assign_iter_statement, statements) else: parent_module = provider.getParentModule() code_object = CodeObjectSpec( co_name=name, co_kind="Function", co_varnames=(), co_argcount=1, co_kwonlyargcount=0, co_has_starlist=False, co_has_stardict=False, co_filename=parent_module.getRunTimeFilename(), co_lineno=source_ref.getLineNumber(), future_spec=parent_module.getFutureSpec()) body = makeStatementsSequenceFromStatements( assign_iter_statement, StatementsFrameFunction(statements=mergeStatements( statements, False), code_object=code_object, source_ref=source_ref)) function_body.setBody(body) return function_body
def buildGeneratorExpressionNode(provider, node, source_ref): # Generator expressions are dealt with by general code. assert getKind(node) == "GeneratorExp" function_body = ExpressionOutlineBody(provider=provider, name="genexpr", source_ref=source_ref) iter_tmp = function_body.allocateTempVariable(temp_scope=None, name=".0") parent_module = provider.getParentModule() code_object = CodeObjectSpec( co_name="<genexpr>", co_kind="Generator", co_varnames=(".0", ), co_argcount=1, co_kwonlyargcount=0, co_has_starlist=False, co_has_stardict=False, co_filename=parent_module.getRunTimeFilename(), co_lineno=source_ref.getLineNumber(), future_spec=parent_module.getFutureSpec()) if python_version < 370: is_async = any( getattr(qual, "is_async", 0) for qual in node.generators) else: is_async = detectFunctionBodyKind(nodes=[node])[0] in ("Asyncgen", "Coroutine") if is_async: code_body = ExpressionAsyncgenObjectBody(provider=provider, name="<genexpr>", code_object=code_object, flags=set(), source_ref=source_ref) maker_class = ExpressionMakeAsyncgenObject else: code_body = ExpressionGeneratorObjectBody(provider=provider, name="<genexpr>", code_object=code_object, flags=set(), source_ref=source_ref) maker_class = ExpressionMakeGeneratorObject function_body.setBody( makeStatementsSequenceFromStatements( StatementAssignmentVariable(variable=iter_tmp, source=_makeIteratorCreation( provider, node.generators[0], source_ref), source_ref=source_ref), makeTryFinallyStatement( provider=function_body, tried=StatementReturn(expression=maker_class( ExpressionFunctionRef(function_body=code_body, source_ref=source_ref), source_ref=source_ref), source_ref=source_ref), final=StatementReleaseVariable(variable=iter_tmp, source_ref=source_ref), source_ref=source_ref))) statements, release_statements = _buildContractionBodyNode( function_body=code_body, provider=provider, node=node, emit_class=ExpressionYield, iter_tmp=iter_tmp, temp_scope=None, start_value=None, container_tmp=None, assign_provider=False, source_ref=source_ref, ) if is_async: statements.append(StatementGeneratorReturnNone(source_ref=source_ref)) statements = (makeTryFinallyStatement( provider=function_body, tried=statements, final=release_statements, source_ref=source_ref.atInternal()), ) code_body.setBody( makeStatementsSequenceFromStatement(statement=StatementsFrameGenerator( statements=mergeStatements(statements, False), code_object=code_object, source_ref=source_ref))) return function_body
def buildLambdaNode(provider, node, source_ref): # Many details to deal with, pylint: disable=too-many-locals assert getKind(node) == "Lambda" function_kind, flags = detectFunctionBodyKind(nodes=(node.body, )) outer_body, function_body, code_object = buildFunctionWithParsing( provider=provider, function_kind=function_kind, name="<lambda>", function_doc=None, flags=flags, node=node, source_ref=source_ref, ) if function_kind == "Function": code_body = function_body else: code_body = ExpressionGeneratorObjectBody( provider=function_body, name="<lambda>", code_object=code_object, flags=set(), source_ref=source_ref, ) code_body.qualname_provider = provider if function_kind == "Generator": function_body.setBody( makeStatementsSequenceFromStatement(statement=StatementReturn( expression=ExpressionMakeGeneratorObject( generator_ref=ExpressionFunctionRef( function_body=code_body, source_ref=source_ref), source_ref=source_ref, ), source_ref=source_ref, ))) defaults = buildNodeList(provider, node.args.defaults, source_ref) kw_defaults = buildParameterKwDefaults(provider=provider, node=node, function_body=function_body, source_ref=source_ref) body = buildNode(provider=code_body, node=node.body, source_ref=source_ref) if function_kind == "Generator": if python_version < 270: tmp_return_value = code_body.allocateTempVariable( temp_scope=None, name="yield_return") statements = ( StatementAssignmentVariable(variable=tmp_return_value, source=body, source_ref=source_ref), makeStatementConditional( condition=ExpressionComparisonIsNOT( left=ExpressionTempVariableRef( variable=tmp_return_value, source_ref=source_ref), right=ExpressionConstantNoneRef(source_ref=source_ref), source_ref=source_ref, ), yes_branch=StatementExpressionOnly( expression=ExpressionYield( expression=ExpressionTempVariableRef( variable=tmp_return_value, source_ref=source_ref), source_ref=source_ref, ), source_ref=source_ref, ), no_branch=None, source_ref=source_ref, ), ) body = makeTryFinallyStatement( provider=provider, tried=statements, final=StatementReleaseVariable(variable=tmp_return_value, source_ref=source_ref), source_ref=source_ref, ) else: body = StatementExpressionOnly(expression=body, source_ref=source_ref) else: body = StatementReturn(expression=body, source_ref=source_ref) if function_kind == "Generator": frame_class = StatementsFrameGenerator else: frame_class = StatementsFrameFunction body = frame_class( statements=mergeStatements((body, )), code_object=code_object, source_ref=body.getSourceReference(), ) body = makeStatementsSequenceFromStatement(statement=body) code_body.setBody(body) annotations = buildParameterAnnotations(provider, node, source_ref) return ExpressionFunctionCreation( function_ref=ExpressionFunctionRef(function_body=outer_body, source_ref=source_ref), defaults=defaults, kw_defaults=kw_defaults, annotations=annotations, source_ref=source_ref, )
def buildTryFinallyNode(provider, build_tried, node, source_ref): if Utils.python_version < 300: # Prevent "continue" statements in the final blocks pushBuildContext("finally") final = buildStatementsNode(provider=provider, nodes=node.finalbody, source_ref=source_ref) popBuildContext() return StatementTryFinally( tried=build_tried(), final=final, public_exc=Utils.python_version >= 300, # TODO: Use below code source_ref=source_ref) else: temp_scope = provider.allocateTempScope("try_finally") tmp_indicator_var = provider.allocateTempVariable( temp_scope=temp_scope, name="unhandled_indicator") # This makes sure, we set the indicator variables for "break", # "continue" and "return" exits as well to true, so we can # know if an exception occurred or not. pushIndicatorVariable(tmp_indicator_var) statements = (StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_indicator_var, source_ref=source_ref.atInternal()), source=ExpressionConstantRef(constant=False, source_ref=source_ref), source_ref=source_ref.atInternal()), build_tried(), StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_indicator_var, source_ref=source_ref.atInternal()), source=ExpressionConstantRef( constant=True, source_ref=source_ref.atLineNumber(99)), source_ref=source_ref.atInternal())) # Prevent "continue" statements in the final blocks, these have to # become "SyntaxError". pushBuildContext("finally") final = buildStatementsNode(provider=provider, nodes=node.finalbody, source_ref=source_ref) popBuildContext() popIndicatorVariable() tried = StatementsSequence(statements=mergeStatements(statements, allow_none=True), source_ref=source_ref) prelude = StatementConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef( variable=tmp_indicator_var, source_ref=source_ref.atInternal()), right=ExpressionConstantRef(constant=False, source_ref=source_ref), source_ref=source_ref), yes_branch=StatementsSequence( statements=(StatementPreserveFrameException( source_ref=source_ref.atInternal()), StatementPublishException( source_ref=source_ref.atInternal())), source_ref=source_ref.atInternal()), no_branch=None, source_ref=source_ref.atInternal()) postlude = (StatementConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef( variable=tmp_indicator_var, source_ref=source_ref.atInternal()), right=ExpressionConstantRef(constant=False, source_ref=source_ref), source_ref=source_ref), yes_branch=StatementsSequence(statements=( StatementReleaseVariable(variable=tmp_indicator_var, tolerant=False, source_ref=source_ref.atInternal()), StatementReraiseFrameException( source_ref=source_ref.atInternal()), ), source_ref=source_ref.atInternal()), no_branch=StatementsSequence(statements=(StatementReleaseVariable( variable=tmp_indicator_var, tolerant=False, source_ref=source_ref.atInternal()), ), source_ref=source_ref.atInternal()), source_ref=source_ref.atInternal()), ) final = StatementsSequence(statements=mergeStatements(( prelude, makeTryFinallyStatement(tried=final, final=postlude, source_ref=source_ref.atInternal()), )), source_ref=source_ref.atInternal()) return StatementTryFinally(tried=tried, final=final, public_exc=True, source_ref=source_ref)
def onLeaveNode(self, node): if node.isStatementAssignmentVariableName(): variable_name = node.getVariableName() provider = node.provider # Classes always assign to locals dictionary except for closure # variables taken. if self._shouldUseLocalsDict(provider, variable_name): if node.subnode_source.isExpressionOperationInplace(): temp_scope = provider.allocateTempScope("class_inplace") tmp_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="value" ) statements = mergeStatements( statements=( StatementAssignmentVariable( variable=tmp_variable, source=node.subnode_source.getLeft(), source_ref=node.source_ref, ), makeTryFinallyStatement( provider=provider, tried=( StatementAssignmentVariable( variable=tmp_variable, source=makeExpressionOperationBinaryInplace( left=ExpressionTempVariableRef( variable=tmp_variable, source_ref=node.source_ref, ), right=node.subnode_source.getRight(), operator=node.subnode_source.getOperator(), source_ref=node.source_ref, ), source_ref=node.source_ref, ), StatementLocalsDictOperationSet( locals_scope=provider.getLocalsScope(), variable_name=variable_name, value=ExpressionTempVariableRef( variable=tmp_variable, source_ref=node.source_ref, ), source_ref=node.source_ref, ), ), final=StatementReleaseVariable( variable=tmp_variable, source_ref=node.source_ref ), source_ref=node.source_ref, ), ) ) node.parent.replaceStatement(node, statements) else: new_node = StatementLocalsDictOperationSet( locals_scope=provider.getLocalsScope(), variable_name=variable_name, value=node.subnode_source, source_ref=node.source_ref, ) node.parent.replaceChild(node, new_node) else: variable = provider.getVariableForAssignment( variable_name=variable_name ) new_node = StatementAssignmentVariable( variable=variable, source=node.subnode_source, source_ref=node.source_ref, ) variable.addVariableUser(provider) node.parent.replaceChild(node, new_node) del node.parent del node.provider elif node.isStatementDelVariableName(): variable_name = node.getVariableName() provider = node.provider if self._shouldUseLocalsDict(provider, variable_name): # Classes always assign to locals dictionary except for closure # variables taken. new_node = StatementLocalsDictOperationDel( locals_scope=provider.getLocalsScope(), variable_name=variable_name, tolerant=node.tolerant, source_ref=node.source_ref, ) else: variable = provider.getVariableForAssignment( variable_name=variable_name ) new_node = StatementDelVariable( variable=variable, tolerant=node.tolerant, source_ref=node.source_ref, ) variable.addVariableUser(provider) parent = node.parent node.finalize() parent.replaceChild(node, new_node)
def wrapEvalGlobalsAndLocals(provider, globals_node, locals_node, temp_scope, source_ref): """ Wrap the locals and globals arguments for eval and exec. For eval, this is called from the outside, and when the node tree already exists. """ globals_keeper_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="globals") locals_keeper_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="locals") if locals_node is None: locals_node = ExpressionConstantRef(constant=None, source_ref=source_ref) if globals_node is None: globals_node = ExpressionConstantRef(constant=None, source_ref=source_ref) post_statements = [ StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=globals_keeper_variable.makeReference(provider), source_ref=globals_node.getSourceReference()), tolerant=False, source_ref=source_ref), StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=locals_keeper_variable.makeReference(provider), source_ref=locals_node.getSourceReference()), tolerant=False, source_ref=source_ref) ] # The locals default is dependant on exec_mode, globals or locals. locals_default = ExpressionConditional( condition=ExpressionComparisonIs(left=ExpressionTempVariableRef( variable=globals_keeper_variable.makeReference(provider), source_ref=source_ref), right=ExpressionConstantRef( constant=None, source_ref=source_ref), source_ref=source_ref), no_expression=ExpressionTempVariableRef( variable=globals_keeper_variable.makeReference(provider), source_ref=source_ref), yes_expression=ExpressionBuiltinLocals(source_ref=source_ref), source_ref=source_ref) pre_statements = [ # First assign globals and locals temporary the values given. StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=globals_keeper_variable.makeReference(provider), source_ref=source_ref), source=globals_node, source_ref=source_ref, ), StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=locals_keeper_variable.makeReference(provider), source_ref=source_ref), source=locals_node, source_ref=source_ref, ), StatementConditional( condition=ExpressionComparisonIs(left=ExpressionTempVariableRef( variable=locals_keeper_variable.makeReference(provider), source_ref=source_ref), right=ExpressionConstantRef( constant=None, source_ref=source_ref), source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=locals_keeper_variable.makeReference( provider), source_ref=source_ref), source=locals_default, source_ref=source_ref, )), no_branch=None, source_ref=source_ref), StatementConditional( condition=ExpressionComparisonIs(left=ExpressionTempVariableRef( variable=globals_keeper_variable.makeReference(provider), source_ref=source_ref), right=ExpressionConstantRef( constant=None, source_ref=source_ref), source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=globals_keeper_variable.makeReference( provider), source_ref=source_ref), source=ExpressionBuiltinGlobals(source_ref=source_ref), source_ref=source_ref, )), no_branch=None, source_ref=source_ref) ] return (ExpressionTempVariableRef( variable=globals_keeper_variable.makeReference(provider), source_ref=source_ref if globals_node is None else globals_node.getSourceReference()), ExpressionTempVariableRef( variable=locals_keeper_variable.makeReference(provider), source_ref=source_ref if locals_node is None else locals_node.getSourceReference()), makeStatementsSequence(pre_statements, False, source_ref), makeStatementsSequence(post_statements, False, source_ref))
def _buildWithNode(provider, context_expr, assign_target, body, sync, source_ref): # Many details, pylint: disable=too-many-locals with_source = buildNode(provider, context_expr, source_ref) if python_version < 380 and Options.isFullCompat(): source_ref = with_source.getCompatibleSourceReference() temp_scope = provider.allocateTempScope("with") tmp_source_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="source" ) tmp_exit_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="exit" ) tmp_enter_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="enter" ) # Indicator variable, will end up with C bool type, and need not be released. tmp_indicator_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="indicator", temp_type="bool" ) statements = ( buildAssignmentStatements( provider=provider, node=assign_target, allow_none=True, source=ExpressionTempVariableRef( variable=tmp_enter_variable, source_ref=source_ref ), source_ref=source_ref, ), body, ) with_body = makeStatementsSequence( statements=statements, allow_none=True, source_ref=source_ref ) if body: deepest = body while deepest.getVisitableNodes(): deepest = deepest.getVisitableNodes()[-1] if python_version < 370: body_lineno = deepest.getCompatibleSourceReference().getLineNumber() else: body_lineno = deepest.getSourceReference().getLineNumber() with_exit_source_ref = source_ref.atLineNumber(body_lineno) else: with_exit_source_ref = source_ref # The "__enter__" and "__exit__" were normal attribute lookups under # CPython2.6, but that changed with CPython2.7. if python_version < 270: attribute_lookup_class = ExpressionAttributeLookup else: attribute_lookup_class = ExpressionAttributeLookupSpecial enter_value = ExpressionCallEmpty( called=attribute_lookup_class( expression=ExpressionTempVariableRef( variable=tmp_source_variable, source_ref=source_ref ), attribute_name="__enter__" if sync else "__aenter__", source_ref=source_ref, ), source_ref=source_ref, ) exit_value_exception = ExpressionCallNoKeywords( called=ExpressionTempVariableRef( variable=tmp_exit_variable, source_ref=with_exit_source_ref ), args=ExpressionMakeTuple( elements=( ExpressionCaughtExceptionTypeRef(source_ref=with_exit_source_ref), ExpressionCaughtExceptionValueRef(source_ref=with_exit_source_ref), ExpressionCaughtExceptionTracebackRef(source_ref=source_ref), ), source_ref=source_ref, ), source_ref=with_exit_source_ref, ) exit_value_no_exception = ExpressionCallNoKeywords( called=ExpressionTempVariableRef( variable=tmp_exit_variable, source_ref=source_ref ), args=makeConstantRefNode(constant=(None, None, None), source_ref=source_ref), source_ref=with_exit_source_ref, ) # For "async with", await the entered value and exit value must be awaited. if not sync: enter_value = ExpressionYieldFromWaitable( expression=ExpressionAsyncWaitEnter( expression=enter_value, source_ref=source_ref ), source_ref=source_ref, ) exit_value_exception = ExpressionYieldFromWaitable( expression=ExpressionAsyncWaitExit( expression=exit_value_exception, source_ref=source_ref ), source_ref=source_ref, ) exit_value_no_exception = ExpressionYieldFromWaitable( ExpressionAsyncWaitExit( expression=exit_value_no_exception, source_ref=source_ref ), source_ref=source_ref, ) statements = [ # First assign the with context to a temporary variable. StatementAssignmentVariable( variable=tmp_source_variable, source=with_source, source_ref=source_ref ) ] attribute_assignments = [ # Next, assign "__enter__" and "__exit__" attributes to temporary # variables. StatementAssignmentVariable( variable=tmp_exit_variable, source=attribute_lookup_class( expression=ExpressionTempVariableRef( variable=tmp_source_variable, source_ref=source_ref ), attribute_name="__exit__" if sync else "__aexit__", source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentVariable( variable=tmp_enter_variable, source=enter_value, source_ref=source_ref ), ] if python_version >= 360 and sync: attribute_assignments.reverse() statements += attribute_assignments statements.append( StatementAssignmentVariable( variable=tmp_indicator_variable, source=makeConstantRefNode(constant=True, source_ref=source_ref), source_ref=source_ref, ) ) statements += ( makeTryFinallyStatement( provider=provider, tried=makeTryExceptSingleHandlerNodeWithPublish( provider=provider, tried=with_body, exception_name="BaseException", handler_body=StatementsSequence( statements=( # Prevents final block from calling __exit__ as # well. StatementAssignmentVariable( variable=tmp_indicator_variable, source=makeConstantRefNode( constant=False, source_ref=source_ref ), source_ref=source_ref, ), makeStatementConditional( condition=exit_value_exception, no_branch=makeReraiseExceptionStatement( source_ref=with_exit_source_ref ), yes_branch=None, source_ref=with_exit_source_ref, ), ), source_ref=source_ref, ), public_exc=python_version >= 270, source_ref=source_ref, ), final=makeStatementConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef( variable=tmp_indicator_variable, source_ref=source_ref ), right=makeConstantRefNode(constant=True, source_ref=source_ref), source_ref=source_ref, ), yes_branch=StatementExpressionOnly( expression=exit_value_no_exception, source_ref=source_ref ), no_branch=None, source_ref=source_ref, ), source_ref=source_ref, ), ) return makeTryFinallyStatement( provider=provider, tried=statements, final=( StatementReleaseVariable( variable=tmp_source_variable, source_ref=with_exit_source_ref ), StatementReleaseVariable( variable=tmp_enter_variable, source_ref=with_exit_source_ref ), StatementReleaseVariable( variable=tmp_exit_variable, source_ref=with_exit_source_ref ), ), source_ref=source_ref, )
def _buildClassNode2(provider, node, source_ref): class_statements, class_doc = extractDocFromBody(node) # This function is the Python2 special case with special re-formulation as # according to developer manual. function_body = ExpressionFunctionBody( provider = provider, is_class = True, parameters = make_class_parameters, name = node.name, doc = class_doc, source_ref = source_ref ) body = buildStatementsNode( provider = function_body, nodes = class_statements, frame = True, source_ref = source_ref ) if body is not None: # The frame guard has nothing to tell its line number to. body.source_ref = source_ref.atInternal() # The class body is basically a function that implicitly, at the end # returns its locals and cannot have other return statements contained, and # starts out with a variables "__module__" and potentially "__doc__" set. statements = [ StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__module__", source_ref = source_ref ), source = ExpressionConstantRef( constant = provider.getParentModule().getFullName(), source_ref = source_ref, user_provided = True ), source_ref = source_ref.atInternal() ) ] if class_doc is not None: statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__doc__", source_ref = source_ref ), source = ExpressionConstantRef( constant = class_doc, source_ref = source_ref, user_provided = True ), source_ref = source_ref.atInternal() ) ) statements += [ body, StatementReturn( expression = ExpressionBuiltinLocals( source_ref = source_ref ), source_ref = source_ref.atInternal() ) ] body = makeStatementsSequence( statements = statements, allow_none = True, source_ref = source_ref ) # The class body is basically a function that implicitly, at the end # returns its locals and cannot have other return statements contained. function_body.setBody(body) temp_scope = provider.allocateTempScope("class_creation") tmp_bases = provider.allocateTempVariable(temp_scope, "bases") tmp_class_dict = provider.allocateTempVariable(temp_scope, "class_dict") tmp_metaclass = provider.allocateTempVariable(temp_scope, "metaclass") tmp_class = provider.allocateTempVariable(temp_scope, "class") statements = [ StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_bases, source_ref = source_ref ), source = makeSequenceCreationOrConstant( sequence_kind = "tuple", elements = buildNodeList( provider, node.bases, source_ref ), source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class_dict, source_ref = source_ref ), source = ExpressionFunctionCall( function = ExpressionFunctionCreation( function_ref = ExpressionFunctionRef( function_body = function_body, source_ref = source_ref ), defaults = (), kw_defaults = None, annotations = None, source_ref = source_ref ), values = (), source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), source = ExpressionConditional( condition = ExpressionComparison( comparator = "In", left = ExpressionConstantRef( constant = "__metaclass__", source_ref = source_ref, user_provided = True ), right = ExpressionTempVariableRef( variable = tmp_class_dict, source_ref = source_ref ), source_ref = source_ref ), yes_expression = ExpressionDictOperationGet( dicte = ExpressionTempVariableRef( variable = tmp_class_dict, source_ref = source_ref ), key = ExpressionConstantRef( constant = "__metaclass__", source_ref = source_ref, user_provided = True ), source_ref = source_ref ), no_expression = ExpressionSelectMetaclass( metaclass = None, bases = ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class, source_ref = source_ref ), source = ExpressionCallNoKeywords( called = ExpressionTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), args = ExpressionMakeTuple( elements = ( ExpressionConstantRef( constant = node.name, source_ref = source_ref, user_provided = True ), ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ), ExpressionTempVariableRef( variable = tmp_class_dict, source_ref = source_ref ) ), source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), ] for decorator in buildNodeList( provider, reversed(node.decorator_list), source_ref ): statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class, source_ref = source_ref ), source = ExpressionCallNoKeywords( called = decorator, args = ExpressionMakeTuple( elements = ( ExpressionTempVariableRef( variable = tmp_class, source_ref = source_ref ), ), source_ref = source_ref ), source_ref = decorator.getSourceReference() ), source_ref = decorator.getSourceReference() ) ) statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = node.name, source_ref = source_ref ), source = ExpressionTempVariableRef( variable = tmp_class, source_ref = source_ref ), source_ref = source_ref ) ) final = ( StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_bases, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class_dict, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), tolerant = True, source_ref = source_ref ) ) return makeTryFinallyStatement( tried = statements, final = final, source_ref = source_ref )
def getClassBasesMroConversionHelper(): helper_name = "_mro_entries_conversion" result = makeInternalHelperFunctionBody( name=helper_name, parameters=ParameterSpec( ps_name=helper_name, ps_normal_args=("bases",), ps_pos_only_args=(), ps_list_star_arg=None, ps_dict_star_arg=None, ps_default_count=0, ps_kw_only_args=(), ), ) temp_scope = None tmp_result_variable = result.allocateTempVariable(temp_scope, "list") tmp_iter_variable = result.allocateTempVariable(temp_scope, "iter") tmp_item_variable = result.allocateTempVariable(temp_scope, "base") args_variable = result.getVariableForAssignment(variable_name="bases") non_type_case = makeStatementConditional( condition=ExpressionAttributeCheck( object_arg=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref ), attribute_name="__mro_entries__", source_ref=internal_source_ref, ), yes_branch=StatementExpressionOnly( expression=ExpressionListOperationExtend( list_arg=ExpressionTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref ), value=makeExpressionCall( called=ExpressionAttributeLookup( expression=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref ), attribute_name="__mro_entries__", source_ref=internal_source_ref, ), args=ExpressionMakeTuple( elements=( ExpressionVariableRef( variable=args_variable, source_ref=internal_source_ref ), ), source_ref=internal_source_ref, ), kw=None, source_ref=internal_source_ref, ), source_ref=internal_source_ref, ), source_ref=internal_source_ref, ), no_branch=StatementListOperationAppend( list_arg=ExpressionTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref ), value=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref ), source_ref=internal_source_ref, ), source_ref=internal_source_ref, ) type_case = StatementListOperationAppend( list_arg=ExpressionTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref ), value=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref ), source_ref=internal_source_ref, ) loop_body = makeStatementsSequenceFromStatements( makeTryExceptSingleHandlerNode( tried=StatementAssignmentVariable( variable=tmp_item_variable, source=ExpressionBuiltinNext1( value=ExpressionTempVariableRef( variable=tmp_iter_variable, source_ref=internal_source_ref ), source_ref=internal_source_ref, ), source_ref=internal_source_ref, ), exception_name="StopIteration", handler_body=StatementLoopBreak(source_ref=internal_source_ref), source_ref=internal_source_ref, ), makeStatementConditional( condition=ExpressionBuiltinIsinstance( instance=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref ), classes=makeConstantRefNode( constant=type, source_ref=internal_source_ref ), source_ref=internal_source_ref, ), yes_branch=type_case, no_branch=non_type_case, source_ref=internal_source_ref, ), ) final = ( StatementReleaseVariable( variable=args_variable, source_ref=internal_source_ref ), StatementReleaseVariable( variable=tmp_result_variable, source_ref=internal_source_ref ), StatementReleaseVariable( variable=tmp_iter_variable, source_ref=internal_source_ref ), StatementReleaseVariable( variable=tmp_item_variable, source_ref=internal_source_ref ), ) tried = makeStatementsSequenceFromStatements( StatementAssignmentVariable( variable=tmp_iter_variable, source=ExpressionBuiltinIter1( value=ExpressionVariableRef( variable=args_variable, source_ref=internal_source_ref ), source_ref=internal_source_ref, ), source_ref=internal_source_ref, ), StatementAssignmentVariable( variable=tmp_result_variable, source=makeConstantRefNode(constant=[], source_ref=internal_source_ref), source_ref=internal_source_ref, ), StatementLoop(body=loop_body, source_ref=internal_source_ref), StatementReturn( expression=ExpressionBuiltinTuple( value=ExpressionTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref ), source_ref=internal_source_ref, ), source_ref=internal_source_ref, ), ) result.setBody( makeStatementsSequenceFromStatement( makeTryFinallyStatement( provider=result, tried=tried, final=final, source_ref=internal_source_ref, ) ) ) return result
def _buildClassNode3(provider, node, source_ref): # Many variables, due to the huge re-formulation that is going on here, # which just has the complexity, pylint: disable=R0914 # This function is the Python3 special case with special re-formulation as # according to developer manual. class_statements, class_doc = extractDocFromBody(node) # We need a scope for the temporary variables, and they might be closured. temp_scope = provider.allocateTempScope( name = "class_creation", allow_closure = True ) tmp_bases = provider.allocateTempVariable( temp_scope = temp_scope, name = "bases" ) tmp_class_decl_dict = provider.allocateTempVariable( temp_scope = temp_scope, name = "class_decl_dict" ) tmp_metaclass = provider.allocateTempVariable( temp_scope = temp_scope, name = "metaclass" ) tmp_prepared = provider.allocateTempVariable( temp_scope = temp_scope, name = "prepared" ) class_creation_function = ExpressionFunctionBody( provider = provider, is_class = True, parameters = make_class_parameters, name = node.name, doc = class_doc, source_ref = source_ref ) # Hack: This allows some APIs to work although this is not yet officially a # child yet. class_creation_function.parent = provider body = buildStatementsNode( provider = class_creation_function, nodes = class_statements, frame = True, source_ref = source_ref ) source_ref_orig = source_ref if body is not None: # The frame guard has nothing to tell its line number to. body.source_ref = source_ref module_variable = class_creation_function.getVariableForAssignment( "__module__" ) statements = [ StatementSetLocals( new_locals = ExpressionTempVariableRef( variable = tmp_prepared, source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__module__", variable = module_variable, source_ref = source_ref ), source = ExpressionConstantRef( constant = provider.getParentModule().getFullName(), source_ref = source_ref, user_provided = True ), source_ref = source_ref ) ] if class_doc is not None: doc_variable = class_creation_function.getVariableForAssignment( "__doc__" ) statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__doc__", variable = doc_variable, source_ref = source_ref ), source = ExpressionConstantRef( constant = class_doc, source_ref = source_ref, user_provided = True ), source_ref = source_ref ) ) # The "__qualname__" attribute is new in Python 3.3. if Utils.python_version >= 330: qualname = class_creation_function.getFunctionQualname() qualname_variable = class_creation_function.getVariableForAssignment( "__qualname__" ) if Utils.python_version < 340: qualname_ref = ExpressionConstantRef( constant = qualname, source_ref = source_ref, user_provided = True ) else: qualname_ref = ExpressionFunctionQualnameRef( function_body = class_creation_function, source_ref = source_ref, ) statements.append( StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = "__qualname__", variable = qualname_variable, source_ref = source_ref ), source = qualname_ref, source_ref = source_ref ) ) if Utils.python_version >= 340: qualname_assign = statements[-1] if Utils.python_version >= 340 and False: # TODO: Temporarily reverted: tmp_class = class_creation_function.allocateTempVariable( temp_scope = None, name = "__class__" ) class_target_variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class, source_ref = source_ref ) class_variable_ref = ExpressionTempVariableRef( variable = tmp_class, source_ref = source_ref ) else: class_variable = class_creation_function.getVariableForAssignment( "__class__" ) class_target_variable_ref = ExpressionTargetVariableRef( variable_name = "__class__", variable = class_variable, source_ref = source_ref ) class_variable_ref = ExpressionVariableRef( variable_name = "__class__", variable = class_variable, source_ref = source_ref ) statements += [ body, StatementAssignmentVariable( variable_ref = class_target_variable_ref, source = ExpressionCall( called = ExpressionTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), args = makeSequenceCreationOrConstant( sequence_kind = "tuple", elements = ( ExpressionConstantRef( constant = node.name, source_ref = source_ref, user_provided = True ), ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ), ExpressionBuiltinLocals( source_ref = source_ref ) ), source_ref = source_ref ), kw = ExpressionTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), StatementReturn( expression = class_variable_ref, source_ref = source_ref ) ] body = makeStatementsSequence( statements = statements, allow_none = True, source_ref = source_ref ) # The class body is basically a function that implicitly, at the end # returns its locals and cannot have other return statements contained. class_creation_function.setBody(body) # The class body is basically a function that implicitly, at the end # returns its created class and cannot have other return statements # contained. decorated_body = ExpressionFunctionCall( function = ExpressionFunctionCreation( function_ref = ExpressionFunctionRef( function_body = class_creation_function, source_ref = source_ref ), defaults = (), kw_defaults = None, annotations = None, source_ref = source_ref ), values = (), source_ref = source_ref ) for decorator in buildNodeList( provider, reversed(node.decorator_list), source_ref ): decorated_body = ExpressionCallNoKeywords( called = decorator, args = ExpressionMakeTuple( elements = ( decorated_body, ), source_ref = source_ref ), source_ref = decorator.getSourceReference() ) statements = ( StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_bases, source_ref = source_ref ), source = makeSequenceCreationOrConstant( sequence_kind = "tuple", elements = buildNodeList( provider, node.bases, source_ref ), source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), source = makeDictCreationOrConstant( keys = [ ExpressionConstantRef( constant = keyword.arg, source_ref = source_ref, user_provided = True ) for keyword in node.keywords ], values = [ buildNode(provider, keyword.value, source_ref) for keyword in node.keywords ], lazy_order = False, source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), source = ExpressionSelectMetaclass( metaclass = ExpressionConditional( condition = ExpressionComparison( comparator = "In", left = ExpressionConstantRef( constant = "metaclass", source_ref = source_ref, user_provided = True ), right = ExpressionTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), source_ref = source_ref ), yes_expression = ExpressionDictOperationGet( dicte = ExpressionTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), key = ExpressionConstantRef( constant = "metaclass", source_ref = source_ref, user_provided = True ), source_ref = source_ref ), no_expression = ExpressionConditional( condition = ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ), no_expression = ExpressionBuiltinRef( builtin_name = "type", source_ref = source_ref ), yes_expression = ExpressionBuiltinType1( value = ExpressionSubscriptLookup( subscribed = ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ), subscript = ExpressionConstantRef( constant = 0, source_ref = source_ref, user_provided = True ), source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), bases = ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref_orig ), StatementConditional( condition = ExpressionComparison( comparator = "In", left = ExpressionConstantRef( constant = "metaclass", source_ref = source_ref, user_provided = True ), right = ExpressionTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), source_ref = source_ref ), no_branch = None, yes_branch = makeStatementsSequenceFromStatement( statement = StatementDictOperationRemove( dicte = ExpressionTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), key = ExpressionConstantRef( constant = "metaclass", source_ref = source_ref, user_provided = True ), source_ref = source_ref ) ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_prepared, source_ref = source_ref ), source = ExpressionConditional( condition = ExpressionBuiltinHasattr( object = ExpressionTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), name = ExpressionConstantRef( constant = "__prepare__", source_ref = source_ref, user_provided = True ), source_ref = source_ref ), no_expression = ExpressionConstantRef( constant = {}, source_ref = source_ref, user_provided = True ), yes_expression = ExpressionCall( called = ExpressionAttributeLookup( source = ExpressionTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), attribute_name = "__prepare__", source_ref = source_ref ), args = ExpressionMakeTuple( elements = ( ExpressionConstantRef( constant = node.name, source_ref = source_ref, user_provided = True ), ExpressionTempVariableRef( variable = tmp_bases, source_ref = source_ref ) ), source_ref = source_ref ), kw = ExpressionTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), source_ref = source_ref ), StatementAssignmentVariable( variable_ref = ExpressionTargetVariableRef( variable_name = node.name, source_ref = source_ref ), source = decorated_body, source_ref = source_ref ), ) if Utils.python_version >= 340: class_assign = statements[-1] # assert False, class_creation_function class_creation_function.qualname_setup = class_assign, qualname_assign final = ( StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_bases, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_class_decl_dict, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_metaclass, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_prepared, source_ref = source_ref ), tolerant = True, source_ref = source_ref ) ) return makeTryFinallyStatement( tried = statements, final = final, source_ref = source_ref )
def buildWhileLoopNode(provider, node, source_ref): # The while loop is re-formulated according to developer manual. The # condition becomes an early condition to break the loop. The else block is # taken if a while loop exits normally, i.e. because of condition not being # true. We do this by introducing an indicator variable. else_block = buildStatementsNode( provider=provider, nodes=node.orelse if node.orelse else None, source_ref=source_ref, ) if else_block is not None: temp_scope = provider.allocateTempScope("while_loop") tmp_break_indicator = provider.allocateTempVariable( temp_scope=temp_scope, name="break_indicator" ) statements = ( StatementAssignmentVariable( variable=tmp_break_indicator, source=makeConstantRefNode(constant=True, source_ref=source_ref), source_ref=source_ref, ), StatementLoopBreak(source_ref=source_ref), ) else: statements = (StatementLoopBreak(source_ref=source_ref),) pushBuildContext("loop_body") loop_statements = buildStatementsNode( provider=provider, nodes=node.body, source_ref=source_ref ) popBuildContext() # The loop body contains a conditional statement at the start that breaks # the loop if it fails. loop_body = makeStatementsSequence( statements=( makeStatementConditional( condition=ExpressionOperationNOT( operand=buildNode(provider, node.test, source_ref), source_ref=source_ref, ), yes_branch=StatementsSequence( statements=statements, source_ref=source_ref ), no_branch=None, source_ref=source_ref, ), loop_statements, ), allow_none=True, source_ref=source_ref, ) loop_statement = StatementLoop(body=loop_body, source_ref=source_ref) if else_block is None: return loop_statement else: statements = ( StatementAssignmentVariable( variable=tmp_break_indicator, source=makeConstantRefNode(constant=False, source_ref=source_ref), source_ref=source_ref, ), loop_statement, makeStatementConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef( variable=tmp_break_indicator, source_ref=source_ref ), right=makeConstantRefNode(constant=True, source_ref=source_ref), source_ref=source_ref, ), yes_branch=else_block, no_branch=None, source_ref=source_ref, ), ) statements = ( makeTryFinallyStatement( provider=provider, tried=statements, final=StatementReleaseVariable( variable=tmp_break_indicator, source_ref=source_ref ), source_ref=source_ref, ), ) return StatementsSequence( statements=mergeStatements(statements, False), source_ref=source_ref )
def buildAssignmentStatementsFromDecoded(provider, kind, detail, source, source_ref): # This is using many variable names on purpose, so as to give names to the # unpacked detail values, and has many branches due to the many cases # dealt with, pylint: disable=too-many-branches,too-many-locals,too-many-statements if kind == "Name": return StatementAssignmentVariableName( provider=provider, variable_name=detail, source=source, source_ref=source_ref, ) elif kind == "Attribute": lookup_source, attribute_name = detail return StatementAssignmentAttribute( expression=lookup_source, attribute_name=attribute_name, source=source, source_ref=source_ref, ) elif kind == "Subscript": subscribed, subscript = detail return StatementAssignmentSubscript( expression=subscribed, subscript=subscript, source=source, source_ref=source_ref, ) elif kind == "Slice": lookup_source, lower, upper = detail # For Python3 there is no slicing operation, this is always done # with subscript using a slice object. For Python2, it is only done # if no "step" is provided. use_sliceobj = python_version >= 300 if use_sliceobj: return StatementAssignmentSubscript( expression=lookup_source, source=source, subscript=ExpressionBuiltinSlice(start=lower, stop=upper, step=None, source_ref=source_ref), source_ref=source_ref, ) else: return StatementAssignmentSlice( expression=lookup_source, lower=lower, upper=upper, source=source, source_ref=source_ref, ) elif kind == "Tuple": temp_scope = provider.allocateTempScope("tuple_unpack") source_iter_var = provider.allocateTempVariable(temp_scope=temp_scope, name="source_iter") element_vars = [ provider.allocateTempVariable(temp_scope=temp_scope, name="element_%d" % (element_index + 1)) for element_index in range(len(detail)) ] starred_list_var = None starred_index = None statements = [] for element_index, element in enumerate(detail): if element[0] == "Starred": if starred_index is not None: raiseSyntaxError( "two starred expressions in assignment", source_ref.atColumnNumber(0), ) starred_index = element_index for element_index, element in enumerate(detail): element_var = element_vars[element_index] if starred_list_var is not None: statements.insert( starred_index + 1, StatementAssignmentVariable( variable=element_var, source=ExpressionListOperationPop( list_arg=ExpressionTempVariableRef( variable=starred_list_var, source_ref=source_ref), source_ref=source_ref, ), source_ref=source_ref, ), ) elif element[0] != "Starred": statements.append( StatementAssignmentVariable( variable=element_var, source=ExpressionSpecialUnpack( value=ExpressionTempVariableRef( variable=source_iter_var, source_ref=source_ref), count=element_index + 1, expected=starred_index or len(detail), starred=starred_index is not None, source_ref=source_ref, ), source_ref=source_ref, )) else: assert starred_index == element_index starred_list_var = element_var statements.append( StatementAssignmentVariable( variable=element_var, source=ExpressionBuiltinList( value=ExpressionTempVariableRef( variable=source_iter_var, source_ref=source_ref), source_ref=source_ref, ), source_ref=source_ref, )) if starred_list_var is None: statements.append( StatementSpecialUnpackCheck( iterator=ExpressionTempVariableRef( variable=source_iter_var, source_ref=source_ref), count=len(detail), source_ref=source_ref, )) else: statements.insert( starred_index + 1, makeStatementConditional( condition=makeComparisonExpression( comparator="Lt", left=ExpressionBuiltinLen( value=ExpressionTempVariableRef( variable=starred_list_var, source_ref=source_ref), source_ref=source_ref, ), right=makeConstantRefNode( constant=len(statements) - starred_index - 1, source_ref=source_ref, ), source_ref=source_ref, ), yes_branch=makeRaiseExceptionExpressionFromTemplate( exception_type="ValueError", template="""\ not enough values to unpack (expected at least %d, got %%d)""" % (len(statements) - 1), template_args=makeBinaryOperationNode( operator="Add", left=ExpressionBuiltinLen( value=ExpressionTempVariableRef( variable=starred_list_var, source_ref=source_ref), source_ref=source_ref, ), right=makeConstantRefNode(constant=starred_index, source_ref=source_ref), source_ref=source_ref, ), source_ref=source_ref, ).asStatement(), no_branch=None, source_ref=source_ref, ), ) if python_version >= 370: iter_creation_class = ExpressionBuiltinIterForUnpack else: iter_creation_class = ExpressionBuiltinIter1 statements = [ StatementAssignmentVariable( variable=source_iter_var, source=iter_creation_class(value=source, source_ref=source_ref), source_ref=source_ref, ), makeTryFinallyStatement( provider=provider, tried=statements, final=(StatementReleaseVariable(variable=source_iter_var, source_ref=source_ref), ), source_ref=source_ref, ), ] # When all is done, copy over to the actual assignment targets, starred # or not makes no difference here anymore. for element_index, element in enumerate(detail): if element[0] == "Starred": element = element[1] element_var = element_vars[element_index] statements.append( buildAssignmentStatementsFromDecoded( provider=provider, kind=element[0], detail=element[1], source=ExpressionTempVariableRef(variable=element_var, source_ref=source_ref), source_ref=source_ref, )) # Need to release temporary variables right after successful # usage. statements.append( StatementDelVariable(variable=element_var, tolerant=True, source_ref=source_ref)) final_statements = [] for element_var in element_vars: final_statements.append( StatementReleaseVariable(variable=element_var, source_ref=source_ref)) return makeTryFinallyStatement( provider=provider, tried=statements, final=final_statements, source_ref=source_ref, ) elif kind == "Starred": raiseSyntaxError( "starred assignment target must be in a list or tuple", source_ref.atColumnNumber(0), ) else: assert False, (kind, source_ref, detail)
def wrapEvalBuiltin(source, globals_arg, locals_arg, source_ref): provider = node.getParentVariableProvider() outline_body = ExpressionOutlineBody( provider = node.getParentVariableProvider(), name = "eval_call", source_ref = source_ref ) globals_ref, locals_ref, tried, final = wrapEvalGlobalsAndLocals( provider = provider, globals_node = globals_arg, locals_node = locals_arg, temp_scope = outline_body.getOutlineTempScope(), source_ref = source_ref ) # The wrapping should not relocate to the "source_ref". assert globals_arg is None or \ globals_ref.getSourceReference() == \ globals_arg.getSourceReference() assert locals_arg is None or \ locals_ref.getSourceReference() == \ locals_arg.getSourceReference() source_variable = outline_body.allocateTempVariable( temp_scope = None, name = "source" ) final.setStatements( final.getStatements() + ( StatementDelVariable( variable_ref = ExpressionTargetTempVariableRef( variable = source_variable, source_ref = source_ref ), tolerant = True, source_ref = source_ref ), ) ) strip_choice = ExpressionConstantRef( constant = (" \t",), source_ref = source_ref ) if python_version >= 300: strip_choice = ExpressionConditional( condition = ExpressionComparisonIs( left = ExpressionBuiltinType1( value = ExpressionTempVariableRef( variable = source_variable, source_ref = source_ref ), source_ref = source_ref ), right = ExpressionBuiltinRef( builtin_name = "bytes", source_ref = source_ref ), source_ref = source_ref ), expression_yes = ExpressionConstantRef( constant = (b" \t",), source_ref = source_ref ), expression_no = strip_choice, source_ref = source_ref ) # Source needs some special treatment for eval, if it's a string, it # must be stripped. string_fixup = [ StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = source_variable, source_ref = source_ref ), source = ExpressionCallNoKeywords( called = ExpressionAttributeLookup( source = ExpressionTempVariableRef( variable = source_variable, source_ref = source_ref ), attribute_name = "strip", source_ref = source_ref ), args = strip_choice, source_ref = source_ref ), source_ref = source_ref ) ] statements = ( StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = source_variable, source_ref = source_ref ), source = source, source_ref = source_ref, ), StatementConditional( condition = ExpressionOperationNOT( operand = ExpressionBuiltinIsinstance( instance = ExpressionTempVariableRef( variable = source_variable, source_ref = source_ref ), classes = ExpressionBuiltinAnonymousRef( builtin_name = "code", source_ref = source_ref, ), source_ref = source_ref ), source_ref = source_ref ), yes_branch = StatementsSequence( statements = string_fixup, source_ref = source_ref ), no_branch = None, source_ref = source_ref ), StatementReturn( expression = ExpressionBuiltinEval( source_code = ExpressionTempVariableRef( variable = source_variable, source_ref = source_ref ), globals_arg = globals_ref, locals_arg = locals_ref, source_ref = source_ref ), source_ref = source_ref ) ) tried = makeStatementsSequence( statements = ( tried, ) + statements, allow_none = False, source_ref = source_ref ) outline_body.setBody( makeStatementsSequenceFromStatement( statement = makeTryFinallyStatement( provider = outline_body, tried = tried, final = final, source_ref = source_ref ) ) ) return outline_body
def _buildInplaceAssignSubscriptNode( provider, subscribed, subscript, tmp_variable1, tmp_variable2, tmp_variable3, operator, expression, source_ref, ): # First assign the subscribed value to a temporary variable. preserve_to_tmp1 = StatementAssignmentVariable(variable=tmp_variable1, source=subscribed, source_ref=source_ref) # Second assign the subscript value to a temporary variable statements = ( StatementAssignmentVariable(variable=tmp_variable2, source=subscript, source_ref=source_ref), StatementAssignmentVariable( variable=tmp_variable3, source=ExpressionSubscriptLookup( expression=ExpressionTempVariableRef(variable=tmp_variable1, source_ref=source_ref), subscript=ExpressionTempVariableRef(variable=tmp_variable2, source_ref=source_ref), source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentVariable( variable=tmp_variable3, source=makeExpressionOperationBinaryInplace( operator=operator, left=ExpressionTempVariableRef(variable=tmp_variable3, source_ref=source_ref), right=expression, source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentSubscript( expression=ExpressionTempVariableRef(variable=tmp_variable1, source_ref=source_ref), subscript=ExpressionTempVariableRef(variable=tmp_variable2, source_ref=source_ref), source=ExpressionTempVariableRef(variable=tmp_variable3, source_ref=source_ref), source_ref=source_ref, ), ) return ( preserve_to_tmp1, makeTryFinallyStatement( provider=provider, tried=statements, final=( StatementReleaseVariable(variable=tmp_variable1, source_ref=source_ref), StatementReleaseVariable(variable=tmp_variable2, source_ref=source_ref), StatementReleaseVariable(variable=tmp_variable3, source_ref=source_ref), ), source_ref=source_ref, ), )
def buildReturnNode(provider, node, source_ref): if not provider.isExpressionFunctionBody() or \ provider.isClassDictCreation(): SyntaxErrors.raiseSyntaxError( "'return' outside function", source_ref, None if Utils.python_version < 300 else ( node.col_offset if provider.isPythonModule() else node.col_offset+4 ) ) expression = buildNode(provider, node.value, source_ref, allow_none = True) if expression is None: expression = ExpressionConstantRef( constant = None, source_ref = source_ref, user_provided = True ) # Indicate exceptions to potentially try/finally structures. indicator_statements = makeTryFinallyIndicatorStatements( is_loop_exit = False, source_ref = source_ref ) if indicator_statements and expression.mayRaiseException(BaseException): tmp_variable = provider.allocateTempVariable( temp_scope = provider.allocateTempScope("return"), name = "value" ) statements = [ StatementAssignmentVariable( variable_ref = ExpressionTargetTempVariableRef( variable = tmp_variable, source_ref = expression.getSourceReference() ), source = expression, source_ref = source_ref ) ] + indicator_statements + [ StatementReturn( expression = ExpressionTempVariableRef( variable = tmp_variable, source_ref = expression.getSourceReference() ), source_ref = source_ref ) ] return makeTryFinallyStatement( tried = statements, final = StatementReleaseVariable( variable = tmp_variable, tolerant = True, source_ref = source_ref ), source_ref = source_ref ) else: return makeStatementsSequenceOrStatement( statements = indicator_statements + [ StatementReturn( expression = expression, source_ref = source_ref ) ], source_ref = source_ref )
def _buildInplaceAssignSliceNode( provider, lookup_source, lower, upper, tmp_variable1, tmp_variable2, tmp_variable3, tmp_variable4, operator, expression, source_ref, ): # Due to the 3 inputs, which we need to also put into temporary variables, # there are too many variables here, but they are needed. # pylint: disable=too-many-locals # First assign the target value, lower and upper to temporary variables. copy_to_tmp = StatementAssignmentVariable(variable=tmp_variable1, source=lookup_source, source_ref=source_ref) final_statements = [ StatementReleaseVariable(variable=tmp_variable1, source_ref=source_ref) ] statements = [] if lower is not None: statements.append( StatementAssignmentVariable(variable=tmp_variable2, source=lower, source_ref=source_ref)) final_statements.append( StatementReleaseVariable(variable=tmp_variable2, source_ref=source_ref)) lower_ref1 = ExpressionTempVariableRef(variable=tmp_variable2, source_ref=source_ref) lower_ref2 = ExpressionTempVariableRef(variable=tmp_variable2, source_ref=source_ref) else: assert tmp_variable2 is None lower_ref1 = lower_ref2 = None if upper is not None: statements.append( StatementAssignmentVariable(variable=tmp_variable3, source=upper, source_ref=source_ref)) final_statements.append( StatementReleaseVariable(variable=tmp_variable3, source_ref=source_ref)) upper_ref1 = ExpressionTempVariableRef(variable=tmp_variable3, source_ref=source_ref) upper_ref2 = ExpressionTempVariableRef(variable=tmp_variable3, source_ref=source_ref) else: assert tmp_variable3 is None upper_ref1 = upper_ref2 = None use_sliceobj = python_version >= 300 # Second assign the in-place result over the original value. if use_sliceobj: statements += ( StatementAssignmentVariable( variable=tmp_variable4, source=ExpressionSubscriptLookup( expression=ExpressionTempVariableRef( variable=tmp_variable1, source_ref=source_ref), subscript=ExpressionBuiltinSlice( start=lower_ref2, stop=upper_ref2, step=None, source_ref=source_ref, ), source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentVariable( variable=tmp_variable4, source=makeExpressionOperationBinaryInplace( operator=operator, left=ExpressionTempVariableRef(variable=tmp_variable4, source_ref=source_ref), right=expression, source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentSubscript( expression=ExpressionTempVariableRef(variable=tmp_variable1, source_ref=source_ref), subscript=ExpressionBuiltinSlice(start=lower_ref1, stop=upper_ref1, step=None, source_ref=source_ref), source=ExpressionTempVariableRef(variable=tmp_variable4, source_ref=source_ref), source_ref=source_ref, ), ) else: statements += ( StatementAssignmentVariable( variable=tmp_variable4, source=ExpressionSliceLookup( expression=ExpressionTempVariableRef( variable=tmp_variable1, source_ref=source_ref), lower=lower_ref2, upper=upper_ref2, source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentVariable( variable=tmp_variable4, source=makeExpressionOperationBinaryInplace( operator=operator, left=ExpressionTempVariableRef(variable=tmp_variable4, source_ref=source_ref), right=expression, source_ref=source_ref, ), source_ref=source_ref, ), StatementAssignmentSlice( expression=ExpressionTempVariableRef(variable=tmp_variable1, source_ref=source_ref), lower=lower_ref1, upper=upper_ref1, source=ExpressionTempVariableRef(variable=tmp_variable4, source_ref=source_ref), source_ref=source_ref, ), ) final_statements.append( StatementReleaseVariable(variable=tmp_variable4, source_ref=source_ref)) return ( copy_to_tmp, makeTryFinallyStatement( provider=provider, tried=statements, final=final_statements, source_ref=source_ref, ), )
def _buildContractionBodyNode(provider, node, emit_class, start_value, container_tmp, outer_iter_ref, temp_scope, assign_provider, source_ref, function_body): if start_value is not None: statements = [ StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=container_tmp.makeReference(function_body), source_ref=source_ref), source=start_value, source_ref=source_ref.atInternal()) ] if assign_provider: tmp_variables = [] else: tmp_variables = [container_tmp] else: statements = [] tmp_variables = [] if hasattr(node, "elt"): if start_value is not None: current_body = emit_class(ExpressionTempVariableRef( variable=container_tmp.makeReference(function_body), source_ref=source_ref), buildNode(provider=function_body, node=node.elt, source_ref=source_ref), source_ref=source_ref) else: assert emit_class is ExpressionYield function_body.markAsGenerator() current_body = emit_class(buildNode(provider=function_body, node=node.elt, source_ref=source_ref), source_ref=source_ref) else: assert emit_class is ExpressionDictOperationSet current_body = emit_class(ExpressionTempVariableRef( variable=container_tmp.makeReference(function_body), source_ref=source_ref), key=buildNode( provider=function_body, node=node.key, source_ref=source_ref, ), value=buildNode( provider=function_body, node=node.value, source_ref=source_ref, ), source_ref=source_ref) current_body = StatementExpressionOnly(expression=current_body, source_ref=source_ref) for count, qual in enumerate(reversed(node.generators)): tmp_value_variable = function_body.allocateTempVariable( temp_scope=temp_scope, name="iter_value_%d" % count) tmp_variables.append(tmp_value_variable) # The first iterated value is to be calculated outside of the function # and will be given as a parameter "_iterated", the others are built # inside the function. if qual is node.generators[0]: def makeIteratorRef(): return outer_iter_ref.makeCloneAt(source_ref) tmp_iter_variable = None nested_statements = [] else: # First create the iterator and store it, next should be loop body value_iterator = ExpressionBuiltinIter1(value=buildNode( provider=function_body, node=qual.iter, source_ref=source_ref), source_ref=source_ref) tmp_iter_variable = function_body.allocateTempVariable( temp_scope=temp_scope, name="contraction_iter_%d" % count) tmp_variables.append(tmp_iter_variable) nested_statements = [ StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_iter_variable.makeReference( function_body), source_ref=source_ref), source=value_iterator, source_ref=source_ref) ] def makeIteratorRef(): return ExpressionTempVariableRef( variable=tmp_iter_variable.makeReference(function_body), source_ref=source_ref) loop_statements = [ makeTryExceptSingleHandlerNode( tried=makeStatementsSequenceFromStatement( statement=StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_value_variable.makeReference( function_body), source_ref=source_ref), source=ExpressionBuiltinNext1(value=makeIteratorRef(), source_ref=source_ref), source_ref=source_ref)), exception_name="StopIteration", handler_body=makeStatementsSequenceFromStatement( statement=StatementBreakLoop( source_ref=source_ref.atInternal())), public_exc=False, source_ref=source_ref), buildAssignmentStatements( provider=provider if assign_provider else function_body, temp_provider=function_body, node=qual.target, source=ExpressionTempVariableRef( variable=tmp_value_variable.makeReference(function_body), source_ref=source_ref), source_ref=source_ref) ] conditions = buildNodeList(provider=function_body, nodes=qual.ifs, source_ref=source_ref) if len(conditions) == 1: loop_statements.append( StatementConditional( condition=conditions[0], yes_branch=makeStatementsSequenceFromStatement( statement=current_body), no_branch=None, source_ref=source_ref)) elif len(conditions) > 1: loop_statements.append( StatementConditional( condition=buildAndNode(provider=function_body, values=conditions, source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( statement=current_body), no_branch=None, source_ref=source_ref)) else: loop_statements.append(current_body) nested_statements.append( StatementLoop(body=StatementsSequence( statements=mergeStatements(loop_statements), source_ref=source_ref), source_ref=source_ref)) if tmp_iter_variable is not None: nested_statements.append( StatementDelVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_iter_variable.makeReference( function_body), source_ref=source_ref), tolerant=False, source_ref=source_ref)) current_body = StatementsSequence(statements=nested_statements, source_ref=source_ref) statements.append(current_body) statements = mergeStatements(statements) if emit_class is ExpressionYield: statements.insert(0, StatementGeneratorEntry(source_ref=source_ref)) del_statements = [] for tmp_variable in tmp_variables: del_statements.append( StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=tmp_variable.makeReference(function_body), source_ref=source_ref), tolerant=True, source_ref=source_ref.atInternal())) return statements, del_statements
def getDictUnpackingHelper(): helper_name = "_unpack_dict" result = ExpressionFunctionBody(provider=getInternalModule(), name=helper_name, doc=None, parameters=ParameterSpec( name=helper_name, normal_args=(), list_star_arg="args", dict_star_arg=None, default_count=0, kw_only_args=()), flags=set(), source_ref=internal_source_ref) temp_scope = None tmp_result_variable = result.allocateTempVariable(temp_scope, "dict") tmp_iter_variable = result.allocateTempVariable(temp_scope, "iter") tmp_item_variable = result.allocateTempVariable(temp_scope, "keys") loop_body = makeStatementsSequenceFromStatements( makeTryExceptSingleHandlerNode( tried=StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref), source=ExpressionBuiltinNext1(value=ExpressionTempVariableRef( variable=tmp_iter_variable, source_ref=internal_source_ref), source_ref=internal_source_ref), source_ref=internal_source_ref), exception_name="StopIteration", handler_body=StatementLoopBreak(source_ref=internal_source_ref), source_ref=internal_source_ref), makeTryExceptSingleHandlerNode( tried=StatementDictOperationUpdate( dict_arg=ExpressionTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref), value=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref), source_ref=internal_source_ref), exception_name="AttributeError", handler_body=StatementRaiseException( exception_type=ExpressionBuiltinMakeException( exception_name="TypeError", args=(ExpressionOperationBinary( operator="Mod", left=ExpressionConstantRef( constant="""\ '%s' object is not a mapping""", source_ref=internal_source_ref, user_provided=True), right=ExpressionMakeTuple( elements=(ExpressionAttributeLookup( source=ExpressionBuiltinType1( value=ExpressionTempVariableRef( variable=tmp_item_variable, source_ref=internal_source_ref), source_ref=internal_source_ref), attribute_name="__name__", source_ref=internal_source_ref), ), source_ref=internal_source_ref), source_ref=internal_source_ref), ), source_ref=internal_source_ref), exception_value=None, exception_trace=None, exception_cause=None, source_ref=internal_source_ref), source_ref=internal_source_ref)) args_variable = result.getVariableForAssignment(variable_name="args") final = ( StatementReleaseVariable(variable=tmp_result_variable, source_ref=internal_source_ref), StatementReleaseVariable(variable=tmp_iter_variable, source_ref=internal_source_ref), StatementReleaseVariable(variable=tmp_item_variable, source_ref=internal_source_ref), ) tried = makeStatementsSequenceFromStatements( StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_iter_variable, source_ref=internal_source_ref), source=ExpressionBuiltinIter1(value=ExpressionVariableRef( variable_name="args", variable=args_variable, source_ref=internal_source_ref), source_ref=internal_source_ref), source_ref=internal_source_ref), StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref), source=ExpressionConstantRef(constant={}, source_ref=internal_source_ref), source_ref=internal_source_ref), StatementLoop(body=loop_body, source_ref=internal_source_ref), StatementReturn(expression=ExpressionTempVariableRef( variable=tmp_result_variable, source_ref=internal_source_ref), source_ref=internal_source_ref)) result.setBody( makeStatementsSequenceFromStatement( makeTryFinallyStatement(provider=result, tried=tried, final=final, source_ref=internal_source_ref))) return result
def _buildWithNode(provider, context_expr, assign_target, body, source_ref): with_source = buildNode(provider, context_expr, source_ref) temp_scope = provider.allocateTempScope("with") tmp_source_variable = provider.allocateTempVariable(temp_scope=temp_scope, name="source") tmp_exit_variable = provider.allocateTempVariable(temp_scope=temp_scope, name="exit") tmp_enter_variable = provider.allocateTempVariable(temp_scope=temp_scope, name="enter") tmp_indicator_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="indicator") statements = (buildAssignmentStatements(provider=provider, node=assign_target, allow_none=True, source=ExpressionTempVariableRef( variable=tmp_enter_variable, source_ref=source_ref), source_ref=source_ref), body) with_body = makeStatementsSequence(statements=statements, allow_none=True, source_ref=source_ref) if Options.isFullCompat() and with_body is not None: with_exit_source_ref = with_body.getStatements()[-1].\ getSourceReference() else: with_exit_source_ref = source_ref # The "__enter__" and "__exit__" were normal attribute lookups under # CPython2.6, but that changed with CPython2.7. if Utils.python_version < 270: attribute_lookup_class = ExpressionAttributeLookup else: attribute_lookup_class = ExpressionSpecialAttributeLookup statements = [ # First assign the with context to a temporary variable. StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_source_variable, source_ref=source_ref), source=with_source, source_ref=source_ref), # Next, assign "__enter__" and "__exit__" attributes to temporary # variables. StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_exit_variable, source_ref=source_ref), source=attribute_lookup_class(source=ExpressionTempVariableRef( variable=tmp_source_variable, source_ref=source_ref), attribute_name="__exit__", source_ref=source_ref), source_ref=source_ref), StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_enter_variable, source_ref=source_ref), source=ExpressionCallEmpty(called=attribute_lookup_class( source=ExpressionTempVariableRef(variable=tmp_source_variable, source_ref=source_ref), attribute_name="__enter__", source_ref=source_ref), source_ref=source_ref), source_ref=source_ref), StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_indicator_variable, source_ref=source_ref), source=ExpressionConstantRef(constant=True, source_ref=source_ref), source_ref=source_ref), ] source_ref = source_ref.atInternal() statements += [ makeTryFinallyStatement( tried=makeTryExceptSingleHandlerNode( tried=with_body, exception_name="BaseException", handler_body=StatementsSequence( statements=( # Prevents final block from calling __exit__ as # well. StatementAssignmentVariable( variable_ref=ExpressionTargetTempVariableRef( variable=tmp_indicator_variable, source_ref=source_ref), source=ExpressionConstantRef( constant=False, source_ref=source_ref), source_ref=source_ref), StatementConditional( condition=ExpressionCallNoKeywords( called=ExpressionTempVariableRef( variable=tmp_exit_variable, source_ref=source_ref), args=ExpressionMakeTuple( elements=( ExpressionCaughtExceptionTypeRef( source_ref=source_ref), ExpressionCaughtExceptionValueRef( source_ref=source_ref), ExpressionCaughtExceptionTracebackRef( source_ref=source_ref), ), source_ref=source_ref), source_ref=source_ref), no_branch=makeStatementsSequenceFromStatement( statement=StatementRaiseException( exception_type=None, exception_value=None, exception_trace=None, exception_cause=None, source_ref=source_ref)), yes_branch=None, source_ref=source_ref), ), source_ref=source_ref), public_exc=Utils.python_version >= 270, source_ref=source_ref), final=StatementConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef( variable=tmp_indicator_variable, source_ref=source_ref), right=ExpressionConstantRef(constant=True, source_ref=source_ref), source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( statement=StatementExpressionOnly( expression=ExpressionCallNoKeywords( called=ExpressionTempVariableRef( variable=tmp_exit_variable, source_ref=source_ref), args=ExpressionConstantRef(constant=(None, None, None), source_ref=source_ref), source_ref=with_exit_source_ref), source_ref=source_ref)), no_branch=None, source_ref=source_ref), source_ref=source_ref) ] return makeTryFinallyStatement( tried=statements, final=( StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=tmp_source_variable, source_ref=source_ref), tolerant=True, source_ref=source_ref), StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=tmp_enter_variable, source_ref=source_ref), tolerant=True, source_ref=source_ref), StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=tmp_exit_variable, source_ref=source_ref), tolerant=True, source_ref=source_ref), StatementDelVariable(variable_ref=ExpressionTargetTempVariableRef( variable=tmp_indicator_variable, source_ref=source_ref), tolerant=True, source_ref=source_ref), ), source_ref=source_ref)
def wrapEvalGlobalsAndLocals(provider, globals_node, locals_node, temp_scope, source_ref): """ Wrap the locals and globals arguments for "eval". This is called from the outside, and when the node tree already exists. """ globals_keeper_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="globals") locals_keeper_variable = provider.allocateTempVariable( temp_scope=temp_scope, name="locals") if locals_node is None: locals_node = ExpressionConstantNoneRef(source_ref=source_ref) if globals_node is None: globals_node = ExpressionConstantNoneRef(source_ref=source_ref) post_statements = [] if provider.isExpressionClassBody(): post_statements.append( StatementLocalsDictSync(locals_arg=ExpressionTempVariableRef( variable=locals_keeper_variable, source_ref=source_ref, ), source_ref=source_ref.atInternal())) post_statements += [ StatementReleaseVariable(variable=globals_keeper_variable, source_ref=source_ref), StatementReleaseVariable(variable=locals_keeper_variable, source_ref=source_ref) ] # The locals default is dependent on exec_mode, globals or locals. locals_default = ExpressionConditional( condition=ExpressionComparisonIs( left=ExpressionTempVariableRef(variable=globals_keeper_variable, source_ref=source_ref), right=ExpressionConstantNoneRef(source_ref=source_ref), source_ref=source_ref), expression_no=ExpressionTempVariableRef( variable=globals_keeper_variable, source_ref=source_ref), expression_yes=makeExpressionBuiltinLocals(provider=provider, source_ref=source_ref), source_ref=source_ref) pre_statements = [ # First assign globals and locals temporary the values given. StatementAssignmentVariable( variable=globals_keeper_variable, source=globals_node, source_ref=source_ref, ), StatementAssignmentVariable( variable=locals_keeper_variable, source=locals_node, source_ref=source_ref, ), StatementConditional(condition=ExpressionComparisonIs( left=ExpressionTempVariableRef(variable=locals_keeper_variable, source_ref=source_ref), right=ExpressionConstantNoneRef(source_ref=source_ref), source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( StatementAssignmentVariable( variable=locals_keeper_variable, source=locals_default, source_ref=source_ref, )), no_branch=None, source_ref=source_ref), StatementConditional(condition=ExpressionComparisonIs( left=ExpressionTempVariableRef(variable=globals_keeper_variable, source_ref=source_ref), right=ExpressionConstantNoneRef(source_ref=source_ref), source_ref=source_ref), yes_branch=makeStatementsSequenceFromStatement( StatementAssignmentVariable( variable=globals_keeper_variable, source=ExpressionBuiltinGlobals( source_ref=source_ref), source_ref=source_ref, )), no_branch=None, source_ref=source_ref) ] return (ExpressionTempVariableRef( variable=globals_keeper_variable, source_ref=source_ref if globals_node is None else globals_node.getSourceReference()), ExpressionTempVariableRef( variable=locals_keeper_variable, source_ref=source_ref if locals_node is None else locals_node.getSourceReference()), makeStatementsSequence(pre_statements, False, source_ref), makeStatementsSequence(post_statements, False, source_ref))