import warnings
from rope.base import pyobjects,exceptions,change,evaluate,codeanalyze
from rope.refactor import sourceutils,occurrences,rename
class MethodObject(object):
def __init__(self, project, resource, offset):
self.pycore = project.pycore
this_pymodule = self.pycore.resource_to_pyobject(resource)
pyname = evaluate.eval_location(this_pymodule, offset)
if pyname is None or not isinstance(pyname.get_object(),
pyobjects.PyFunction):
raise exceptions.RefactoringError(
'Replace method with method object refactoring should be '
'performed on a function.')
self.pyfunction = pyname.get_object()
self.pymodule = self.pyfunction.get_module()
self.resource = self.pymodule.get_resource()
def get_new_class(self, name):
body = sourceutils.fix_indentation(
self._get_body(), sourceutils.get_indent(self.pycore) * 2)
return 'class %s(object):\n\n%s%sdef __call__(self):\n%s' % \
(name, self._get_init(),
' ' * sourceutils.get_indent(self.pycore), body)
def get_changes(self, classname=None, new_class_name=None):
if new_class_name is not None:
warnings.warn(
'new_class_name parameter is deprecated; use classname',
DeprecationWarning, stacklevel=2)
classname = new_class_name
collector = codeanalyze.ChangeCollector(self.pymodule.source_code)
start, end = sourceutils.get_body_region(self.pyfunction)
indents = sourceutils.get_indents(
self.pymodule.lines, self.pyfunction.get_scope().get_start()) + \
sourceutils.get_indent(self.pycore)
new_contents = ' ' * indents + 'return %s(%s)()\n' % \
(classname, ', '.join(self._get_parameter_names()))
collector.add_change(start, end, new_contents)
insertion = self._get_class_insertion_point()
collector.add_change(insertion, insertion,
'\n\n' + self.get_new_class(classname))
changes = change.ChangeSet('Replace method with method object refactoring')
changes.add_change(change.ChangeContents(self.resource,
collector.get_changed()))
return changes
def _get_class_insertion_point(self):
current = self.pyfunction
while current.parent != self.pymodule:
current = current.parent
end = self.pymodule.lines.get_line_end(current.get_scope().get_end())
return min(end + 1, len(self.pymodule.source_code))
def _get_body(self):
body = sourceutils.get_body(self.pyfunction)
for param in self._get_parameter_names():
body = param + ' = None\n' + body
pymod = self.pycore.get_string_module(body, self.resource)
pyname = pymod[param]
finder = occurrences.create_finder(self.pycore, param, pyname)
result = rename.rename_in_module(finder, 'self.' + param,
pymodule=pymod)
body = result[result.index('\n') + 1:]
return body
def _get_init(self):
params = self._get_parameter_names()
indents = ' ' * sourceutils.get_indent(self.pycore)
if not params:
return ''
header = indents + 'def __init__(self'
body = ''
for arg in params:
new_name = arg
if arg == 'self':
new_name = 'host'
header += ', %s' % new_name
body += indents * 2 + 'self.%s = %s\n' % (arg, new_name)
header += '):'
return '%s\n%s\n' % (header, body)
def _get_parameter_names(self):
return self.pyfunction.get_param_names()
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