mirror of
https://github.com/python/cpython
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314 lines
11 KiB
Python
314 lines
11 KiB
Python
"""Parse a Python module and describe its classes and functions.
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Parse enough of a Python file to recognize imports and class and
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function definitions, and to find out the superclasses of a class.
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The interface consists of a single function:
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readmodule_ex(module, path=None)
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where module is the name of a Python module, and path is an optional
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list of directories where the module is to be searched. If present,
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path is prepended to the system search path sys.path. The return value
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is a dictionary. The keys of the dictionary are the names of the
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classes and functions defined in the module (including classes that are
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defined via the from XXX import YYY construct). The values are
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instances of classes Class and Function. One special key/value pair is
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present for packages: the key '__path__' has a list as its value which
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contains the package search path.
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Classes and Functions have a common superclass: _Object. Every instance
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has the following attributes:
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module -- name of the module;
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name -- name of the object;
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file -- file in which the object is defined;
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lineno -- line in the file where the object's definition starts;
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end_lineno -- line in the file where the object's definition ends;
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parent -- parent of this object, if any;
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children -- nested objects contained in this object.
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The 'children' attribute is a dictionary mapping names to objects.
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Instances of Function describe functions with the attributes from _Object,
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plus the following:
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is_async -- if a function is defined with an 'async' prefix
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Instances of Class describe classes with the attributes from _Object,
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plus the following:
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super -- list of super classes (Class instances if possible);
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methods -- mapping of method names to beginning line numbers.
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If the name of a super class is not recognized, the corresponding
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entry in the list of super classes is not a class instance but a
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string giving the name of the super class. Since import statements
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are recognized and imported modules are scanned as well, this
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shouldn't happen often.
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"""
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import ast
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import sys
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import importlib.util
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__all__ = ["readmodule", "readmodule_ex", "Class", "Function"]
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_modules = {} # Initialize cache of modules we've seen.
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class _Object:
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"Information about Python class or function."
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def __init__(self, module, name, file, lineno, end_lineno, parent):
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self.module = module
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self.name = name
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self.file = file
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self.lineno = lineno
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self.end_lineno = end_lineno
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self.parent = parent
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self.children = {}
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if parent is not None:
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parent.children[name] = self
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# Odd Function and Class signatures are for back-compatibility.
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class Function(_Object):
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"Information about a Python function, including methods."
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def __init__(self, module, name, file, lineno,
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parent=None, is_async=False, *, end_lineno=None):
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super().__init__(module, name, file, lineno, end_lineno, parent)
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self.is_async = is_async
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if isinstance(parent, Class):
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parent.methods[name] = lineno
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class Class(_Object):
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"Information about a Python class."
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def __init__(self, module, name, super_, file, lineno,
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parent=None, *, end_lineno=None):
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super().__init__(module, name, file, lineno, end_lineno, parent)
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self.super = super_ or []
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self.methods = {}
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# These 2 functions are used in these tests
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# Lib/test/test_pyclbr, Lib/idlelib/idle_test/test_browser.py
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def _nest_function(ob, func_name, lineno, end_lineno, is_async=False):
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"Return a Function after nesting within ob."
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return Function(ob.module, func_name, ob.file, lineno,
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parent=ob, is_async=is_async, end_lineno=end_lineno)
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def _nest_class(ob, class_name, lineno, end_lineno, super=None):
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"Return a Class after nesting within ob."
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return Class(ob.module, class_name, super, ob.file, lineno,
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parent=ob, end_lineno=end_lineno)
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def readmodule(module, path=None):
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"""Return Class objects for the top-level classes in module.
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This is the original interface, before Functions were added.
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"""
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res = {}
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for key, value in _readmodule(module, path or []).items():
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if isinstance(value, Class):
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res[key] = value
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return res
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def readmodule_ex(module, path=None):
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"""Return a dictionary with all functions and classes in module.
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Search for module in PATH + sys.path.
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If possible, include imported superclasses.
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Do this by reading source, without importing (and executing) it.
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"""
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return _readmodule(module, path or [])
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def _readmodule(module, path, inpackage=None):
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"""Do the hard work for readmodule[_ex].
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If inpackage is given, it must be the dotted name of the package in
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which we are searching for a submodule, and then PATH must be the
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package search path; otherwise, we are searching for a top-level
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module, and path is combined with sys.path.
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"""
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# Compute the full module name (prepending inpackage if set).
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if inpackage is not None:
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fullmodule = "%s.%s" % (inpackage, module)
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else:
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fullmodule = module
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# Check in the cache.
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if fullmodule in _modules:
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return _modules[fullmodule]
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# Initialize the dict for this module's contents.
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tree = {}
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# Check if it is a built-in module; we don't do much for these.
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if module in sys.builtin_module_names and inpackage is None:
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_modules[module] = tree
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return tree
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# Check for a dotted module name.
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i = module.rfind('.')
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if i >= 0:
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package = module[:i]
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submodule = module[i+1:]
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parent = _readmodule(package, path, inpackage)
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if inpackage is not None:
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package = "%s.%s" % (inpackage, package)
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if not '__path__' in parent:
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raise ImportError('No package named {}'.format(package))
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return _readmodule(submodule, parent['__path__'], package)
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# Search the path for the module.
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f = None
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if inpackage is not None:
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search_path = path
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else:
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search_path = path + sys.path
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spec = importlib.util._find_spec_from_path(fullmodule, search_path)
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if spec is None:
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raise ModuleNotFoundError(f"no module named {fullmodule!r}", name=fullmodule)
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_modules[fullmodule] = tree
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# Is module a package?
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if spec.submodule_search_locations is not None:
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tree['__path__'] = spec.submodule_search_locations
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try:
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source = spec.loader.get_source(fullmodule)
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except (AttributeError, ImportError):
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# If module is not Python source, we cannot do anything.
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return tree
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else:
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if source is None:
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return tree
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fname = spec.loader.get_filename(fullmodule)
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return _create_tree(fullmodule, path, fname, source, tree, inpackage)
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class _ModuleBrowser(ast.NodeVisitor):
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def __init__(self, module, path, file, tree, inpackage):
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self.path = path
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self.tree = tree
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self.file = file
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self.module = module
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self.inpackage = inpackage
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self.stack = []
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def visit_ClassDef(self, node):
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bases = []
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for base in node.bases:
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name = ast.unparse(base)
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if name in self.tree:
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# We know this super class.
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bases.append(self.tree[name])
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elif len(names := name.split(".")) > 1:
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# Super class form is module.class:
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# look in module for class.
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*_, module, class_ = names
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if module in _modules:
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bases.append(_modules[module].get(class_, name))
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else:
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bases.append(name)
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parent = self.stack[-1] if self.stack else None
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class_ = Class(self.module, node.name, bases, self.file, node.lineno,
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parent=parent, end_lineno=node.end_lineno)
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if parent is None:
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self.tree[node.name] = class_
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self.stack.append(class_)
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self.generic_visit(node)
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self.stack.pop()
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def visit_FunctionDef(self, node, *, is_async=False):
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parent = self.stack[-1] if self.stack else None
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function = Function(self.module, node.name, self.file, node.lineno,
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parent, is_async, end_lineno=node.end_lineno)
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if parent is None:
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self.tree[node.name] = function
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self.stack.append(function)
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self.generic_visit(node)
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self.stack.pop()
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def visit_AsyncFunctionDef(self, node):
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self.visit_FunctionDef(node, is_async=True)
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def visit_Import(self, node):
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if node.col_offset != 0:
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return
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for module in node.names:
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try:
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try:
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_readmodule(module.name, self.path, self.inpackage)
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except ImportError:
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_readmodule(module.name, [])
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except (ImportError, SyntaxError):
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# If we can't find or parse the imported module,
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# too bad -- don't die here.
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continue
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def visit_ImportFrom(self, node):
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if node.col_offset != 0:
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return
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try:
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module = "." * node.level
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if node.module:
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module += node.module
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module = _readmodule(module, self.path, self.inpackage)
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except (ImportError, SyntaxError):
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return
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for name in node.names:
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if name.name in module:
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self.tree[name.asname or name.name] = module[name.name]
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elif name.name == "*":
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for import_name, import_value in module.items():
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if import_name.startswith("_"):
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continue
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self.tree[import_name] = import_value
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def _create_tree(fullmodule, path, fname, source, tree, inpackage):
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mbrowser = _ModuleBrowser(fullmodule, path, fname, tree, inpackage)
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mbrowser.visit(ast.parse(source))
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return mbrowser.tree
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def _main():
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"Print module output (default this file) for quick visual check."
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import os
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try:
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mod = sys.argv[1]
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except:
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mod = __file__
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if os.path.exists(mod):
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path = [os.path.dirname(mod)]
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mod = os.path.basename(mod)
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if mod.lower().endswith(".py"):
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mod = mod[:-3]
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else:
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path = []
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tree = readmodule_ex(mod, path)
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lineno_key = lambda a: getattr(a, 'lineno', 0)
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objs = sorted(tree.values(), key=lineno_key, reverse=True)
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indent_level = 2
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while objs:
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obj = objs.pop()
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if isinstance(obj, list):
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# Value is a __path__ key.
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continue
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if not hasattr(obj, 'indent'):
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obj.indent = 0
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if isinstance(obj, _Object):
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new_objs = sorted(obj.children.values(),
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key=lineno_key, reverse=True)
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for ob in new_objs:
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ob.indent = obj.indent + indent_level
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objs.extend(new_objs)
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if isinstance(obj, Class):
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print("{}class {} {} {}"
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.format(' ' * obj.indent, obj.name, obj.super, obj.lineno))
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elif isinstance(obj, Function):
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print("{}def {} {}".format(' ' * obj.indent, obj.name, obj.lineno))
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if __name__ == "__main__":
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_main()
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