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345 lines
13 KiB
345 lines
13 KiB
5 years ago
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"""Parse a Python module and describe its classes and methods.
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Parse enough of a Python file to recognize imports and class and
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method 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])
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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
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value is a dictionary. The keys of the dictionary are the names of
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the classes defined in the module (including classes that are defined
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via the from XXX import YYY construct). The values are class
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instances of the class Class defined here. One special key/value pair
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is present for packages: the key '__path__' has a list as its value
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which contains the package search path.
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A class is described by the class Class in this module. Instances
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of this class have the following instance variables:
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module -- the module name
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name -- the name of the class
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super -- a list of super classes (Class instances)
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methods -- a dictionary of methods
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file -- the file in which the class was defined
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lineno -- the line in the file on which the class statement occurred
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The dictionary of methods uses the method names as keys and the line
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numbers on which the method was defined as values.
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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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A function is described by the class Function in this module.
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Instances of this class have the following instance variables:
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module -- the module name
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name -- the name of the class
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file -- the file in which the class was defined
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lineno -- the line in the file on which the class statement occurred
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"""
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import sys
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import imp
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import tokenize
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from token import NAME, DEDENT, OP
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from operator import itemgetter
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__all__ = ["readmodule", "readmodule_ex", "Class", "Function"]
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_modules = {} # cache of modules we've seen
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# each Python class is represented by an instance of this class
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class Class:
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'''Class to represent a Python class.'''
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def __init__(self, module, name, super, file, lineno):
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self.module = module
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self.name = name
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if super is None:
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super = []
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self.super = super
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self.methods = {}
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self.file = file
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self.lineno = lineno
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def _addmethod(self, name, lineno):
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self.methods[name] = lineno
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class Function:
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'''Class to represent a top-level Python function'''
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def __init__(self, module, name, file, lineno):
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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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def readmodule(module, path=None):
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'''Backwards compatible interface.
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Call readmodule_ex() and then only keep Class objects from the
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resulting dictionary.'''
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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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'''Read a module file and return a dictionary of classes.
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Search for MODULE in PATH and sys.path, read and parse the
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module and return a dictionary with one entry for each class
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found in the module.
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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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dict = {}
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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] = dict
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return dict
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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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f, fname, (_s, _m, ty) = imp.find_module(module, path)
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else:
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f, fname, (_s, _m, ty) = imp.find_module(module, path + sys.path)
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if ty == imp.PKG_DIRECTORY:
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dict['__path__'] = [fname]
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path = [fname] + path
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f, fname, (_s, _m, ty) = imp.find_module('__init__', [fname])
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_modules[fullmodule] = dict
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if ty != imp.PY_SOURCE:
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# not Python source, can't do anything with this module
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f.close()
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return dict
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stack = [] # stack of (class, indent) pairs
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g = tokenize.generate_tokens(f.readline)
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try:
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for tokentype, token, start, _end, _line in g:
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if tokentype == DEDENT:
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lineno, thisindent = start
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# close nested classes and defs
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while stack and stack[-1][1] >= thisindent:
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del stack[-1]
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elif token == 'def':
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lineno, thisindent = start
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# close previous nested classes and defs
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while stack and stack[-1][1] >= thisindent:
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del stack[-1]
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tokentype, meth_name, start = g.next()[0:3]
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if tokentype != NAME:
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continue # Syntax error
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if stack:
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cur_class = stack[-1][0]
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if isinstance(cur_class, Class):
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# it's a method
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cur_class._addmethod(meth_name, lineno)
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# else it's a nested def
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else:
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# it's a function
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dict[meth_name] = Function(fullmodule, meth_name,
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fname, lineno)
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stack.append((None, thisindent)) # Marker for nested fns
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elif token == 'class':
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lineno, thisindent = start
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# close previous nested classes and defs
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while stack and stack[-1][1] >= thisindent:
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del stack[-1]
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tokentype, class_name, start = g.next()[0:3]
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if tokentype != NAME:
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continue # Syntax error
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# parse what follows the class name
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tokentype, token, start = g.next()[0:3]
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inherit = None
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if token == '(':
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names = [] # List of superclasses
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# there's a list of superclasses
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level = 1
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super = [] # Tokens making up current superclass
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while True:
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tokentype, token, start = g.next()[0:3]
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if token in (')', ',') and level == 1:
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n = "".join(super)
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if n in dict:
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# we know this super class
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n = dict[n]
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else:
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c = n.split('.')
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if len(c) > 1:
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# super class is of the form
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# module.class: look in module for
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# class
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m = c[-2]
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c = c[-1]
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if m in _modules:
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d = _modules[m]
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if c in d:
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n = d[c]
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names.append(n)
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super = []
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if token == '(':
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level += 1
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elif token == ')':
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level -= 1
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if level == 0:
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break
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elif token == ',' and level == 1:
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pass
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# only use NAME and OP (== dot) tokens for type name
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elif tokentype in (NAME, OP) and level == 1:
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super.append(token)
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# expressions in the base list are not supported
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inherit = names
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cur_class = Class(fullmodule, class_name, inherit,
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fname, lineno)
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if not stack:
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dict[class_name] = cur_class
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stack.append((cur_class, thisindent))
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elif token == 'import' and start[1] == 0:
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modules = _getnamelist(g)
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for mod, _mod2 in modules:
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try:
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# Recursively read the imported module
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if inpackage is None:
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_readmodule(mod, path)
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else:
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try:
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_readmodule(mod, path, inpackage)
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except ImportError:
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_readmodule(mod, [])
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except:
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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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pass
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elif token == 'from' and start[1] == 0:
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mod, token = _getname(g)
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if not mod or token != "import":
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continue
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names = _getnamelist(g)
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try:
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# Recursively read the imported module
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d = _readmodule(mod, path, inpackage)
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except:
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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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# add any classes that were defined in the imported module
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# to our name space if they were mentioned in the list
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for n, n2 in names:
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if n in d:
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dict[n2 or n] = d[n]
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elif n == '*':
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# don't add names that start with _
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for n in d:
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if n[0] != '_':
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dict[n] = d[n]
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except StopIteration:
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pass
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f.close()
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return dict
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def _getnamelist(g):
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# Helper to get a comma-separated list of dotted names plus 'as'
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# clauses. Return a list of pairs (name, name2) where name2 is
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# the 'as' name, or None if there is no 'as' clause.
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names = []
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while True:
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name, token = _getname(g)
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if not name:
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break
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if token == 'as':
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name2, token = _getname(g)
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else:
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name2 = None
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names.append((name, name2))
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while token != "," and "\n" not in token:
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token = g.next()[1]
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if token != ",":
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break
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return names
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def _getname(g):
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# Helper to get a dotted name, return a pair (name, token) where
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# name is the dotted name, or None if there was no dotted name,
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# and token is the next input token.
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parts = []
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tokentype, token = g.next()[0:2]
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if tokentype != NAME and token != '*':
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return (None, token)
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parts.append(token)
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while True:
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tokentype, token = g.next()[0:2]
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if token != '.':
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break
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tokentype, token = g.next()[0:2]
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if tokentype != NAME:
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break
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parts.append(token)
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return (".".join(parts), token)
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def _main():
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# Main program for testing.
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import os
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mod = sys.argv[1]
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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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dict = readmodule_ex(mod, path)
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objs = dict.values()
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objs.sort(lambda a, b: cmp(getattr(a, 'lineno', 0),
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getattr(b, 'lineno', 0)))
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for obj in objs:
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if isinstance(obj, Class):
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print "class", obj.name, obj.super, obj.lineno
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methods = sorted(obj.methods.iteritems(), key=itemgetter(1))
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for name, lineno in methods:
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if name != "__path__":
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print " def", name, lineno
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elif isinstance(obj, Function):
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print "def", obj.name, obj.lineno
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if __name__ == "__main__":
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_main()
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