"""Parse a Python module and describe its classes and methods.
Parse enough of a Python file to recognize imports and class and
method definitions, and to find out the superclasses of a class.
The interface consists of a single function:
readmodule_ex(module [, path])
where module is the name of a Python module, and path is an optional
list of directories where the module is to be searched. If present,
path is prepended to the system search path sys.path. The return
value is a dictionary. The keys of the dictionary are the names of
the classes defined in the module (including classes that are defined
via the from XXX import YYY construct). The values are class
instances of the class Class defined here. One special key/value pair
is present for packages: the key '__path__' has a list as its value
which contains the package search path.
A class is described by the class Class in this module. Instances
of this class have the following instance variables:
module -- the module name
name -- the name of the class
super -- a list of super classes (Class instances)
methods -- a dictionary of methods
file -- the file in which the class was defined
lineno -- the line in the file on which the class statement occurred
The dictionary of methods uses the method names as keys and the line
numbers on which the method was defined as values.
If the name of a super class is not recognized, the corresponding
entry in the list of super classes is not a class instance but a
string giving the name of the super class. Since import statements
are recognized and imported modules are scanned as well, this
shouldn't happen often.
A function is described by the class Function in this module.
Instances of this class have the following instance variables:
module -- the module name
name -- the name of the class
file -- the file in which the class was defined
lineno -- the line in the file on which the class statement occurred
"""
import io
import sys
import importlib.util
import tokenize
from token import NAME, DEDENT, OP
__all__ = ["readmodule", "readmodule_ex", "Class", "Function"]
_modules = {} # cache of modules we've seen
# each Python class is represented by an instance of this class
class Class:
'''Class to represent a Python class.'''
def __init__(self, module, name, super, file, lineno):
self.module = module
self.name = name
if super is None:
super = []
self.super = super
self.methods = {}
self.file = file
self.lineno = lineno
def _addmethod(self, name, lineno):
self.methods[name] = lineno
class Function:
'''Class to represent a top-level Python function'''
def __init__(self, module, name, file, lineno):
self.module = module
self.name = name
self.file = file
self.lineno = lineno
def readmodule(module, path=None):
'''Backwards compatible interface.
Call readmodule_ex() and then only keep Class objects from the
resulting dictionary.'''
res = {}
for key, value in _readmodule(module, path or []).items():
if isinstance(value, Class):
res[key] = value
return res
def readmodule_ex(module, path=None):
'''Read a module file and return a dictionary of classes.
Search for MODULE in PATH and sys.path, read and parse the
module and return a dictionary with one entry for each class
found in the module.
'''
return _readmodule(module, path or [])
def _readmodule(module, path, inpackage=None):
'''Do the hard work for readmodule[_ex].
If INPACKAGE is given, it must be the dotted name of the package in
which we are searching for a submodule, and then PATH must be the
package search path; otherwise, we are searching for a top-level
module, and PATH is combined with sys.path.
'''
# Compute the full module name (prepending inpackage if set)
if inpackage is not None:
fullmodule = "%s.%s" % (inpackage, module)
else:
fullmodule = module
# Check in the cache
if fullmodule in _modules:
return _modules[fullmodule]
# Initialize the dict for this module's contents
dict = {}
# Check if it is a built-in module; we don't do much for these
if module in sys.builtin_module_names and inpackage is None:
_modules[module] = dict
return dict
# Check for a dotted module name
i = module.rfind('.')
if i >= 0:
package = module[:i]
submodule = module[i+1:]
parent = _readmodule(package, path, inpackage)
if inpackage is not None:
package = "%s.%s" % (inpackage, package)
if not '__path__' in parent:
raise ImportError('No package named {}'.format(package))
return _readmodule(submodule, parent['__path__'], package)
# Search the path for the module
f = None
if inpackage is not None:
search_path = path
else:
search_path = path + sys.path
# XXX This will change once issue19944 lands.
spec = importlib.util._find_spec_from_path(fullmodule, search_path)
_modules[fullmodule] = dict
# is module a package?
if spec.submodule_search_locations is not None:
dict['__path__'] = spec.submodule_search_locations
try:
source = spec.loader.get_source(fullmodule)
if source is None:
return dict
except (AttributeError, ImportError):
# not Python source, can't do anything with this module
return dict
fname = spec.loader.get_filename(fullmodule)
f = io.StringIO(source)
stack = [] # stack of (class, indent) pairs
g = tokenize.generate_tokens(f.readline)
try:
for tokentype, token, start, _end, _line in g:
if tokentype == DEDENT:
lineno, thisindent = start
# close nested classes and defs
while stack and stack[-1][1] >= thisindent:
del stack[-1]
elif token == 'def':
lineno, thisindent = start
# close previous nested classes and defs
while stack and stack[-1][1] >= thisindent:
del stack[-1]
tokentype, meth_name, start = next(g)[0:3]
if tokentype != NAME:
continue # Syntax error
if stack:
cur_class = stack[-1][0]
if isinstance(cur_class, Class):
# it's a method
cur_class._addmethod(meth_name, lineno)
# else it's a nested def
else:
# it's a function
dict[meth_name] = Function(fullmodule, meth_name,
fname, lineno)
stack.append((None, thisindent)) # Marker for nested fns
elif token == 'class':
lineno, thisindent = start
# close previous nested classes and defs
while stack and stack[-1][1] >= thisindent:
del stack[-1]
tokentype, class_name, start = next(g)[0:3]
if tokentype != NAME:
continue # Syntax error
# parse what follows the class name
tokentype, token, start = next(g)[0:3]
inherit = None
if token == '(':
names = [] # List of superclasses
# there's a list of superclasses
level = 1
super = [] # Tokens making up current superclass
while True:
tokentype, token, start = next(g)[0:3]
if token in (')', ',') and level == 1:
n = "".join(super)
if n in dict:
# we know this super class
n = dict[n]
else:
c = n.split('.')
if len(c) > 1:
# super class is of the form
# module.class: look in module for
# class
m = c[-2]
c = c[-1]
if m in _modules:
d = _modules[m]
if c in d:
n = d[c]
names.append(n)
super = []
if token == '(':
level += 1
elif token == ')':
level -= 1
if level == 0:
break
elif token == ',' and level == 1:
pass
# only use NAME and OP (== dot) tokens for type name
elif tokentype in (NAME, OP) and level == 1:
super.append(token)
# expressions in the base list are not supported
inherit = names
cur_class = Class(fullmodule, class_name, inherit,
fname, lineno)
if not stack:
dict[class_name] = cur_class
stack.append((cur_class, thisindent))
elif token == 'import' and start[1] == 0:
modules = _getnamelist(g)
for mod, _mod2 in modules:
try:
# Recursively read the imported module
if inpackage is None:
_readmodule(mod, path)
else:
try:
_readmodule(mod, path, inpackage)
except ImportError:
_readmodule(mod, [])
except:
# If we can't find or parse the imported module,
# too bad -- don't die here.
pass
elif token == 'from' and start[1] == 0:
mod, token = _getname(g)
if not mod or token != "import":
continue
names = _getnamelist(g)
try:
# Recursively read the imported module
d = _readmodule(mod, path, inpackage)
except:
# If we can't find or parse the imported module,
# too bad -- don't die here.
continue
# add any classes that were defined in the imported module
# to our name space if they were mentioned in the list
for n, n2 in names:
if n in d:
dict[n2 or n] = d[n]
elif n == '*':
# don't add names that start with _
for n in d:
if n[0] != '_':
dict[n] = d[n]
except StopIteration:
pass
f.close()
return dict
def _getnamelist(g):
# Helper to get a comma-separated list of dotted names plus 'as'
# clauses. Return a list of pairs (name, name2) where name2 is
# the 'as' name, or None if there is no 'as' clause.
names = []
while True:
name, token = _getname(g)
if not name:
break
if token == 'as':
name2, token = _getname(g)
else:
name2 = None
names.append((name, name2))
while token != "," and "\n" not in token:
token = next(g)[1]
if token != ",":
break
return names
def _getname(g):
# Helper to get a dotted name, return a pair (name, token) where
# name is the dotted name, or None if there was no dotted name,
# and token is the next input token.
parts = []
tokentype, token = next(g)[0:2]
if tokentype != NAME and token != '*':
return (None, token)
parts.append(token)
while True:
tokentype, token = next(g)[0:2]
if token != '.':
break
tokentype, token = next(g)[0:2]
if tokentype != NAME:
break
parts.append(token)
return (".".join(parts), token)
def _main():
# Main program for testing.
import os
from operator import itemgetter
mod = sys.argv[1]
if os.path.exists(mod):
path = [os.path.dirname(mod)]
mod = os.path.basename(mod)
if mod.lower().endswith(".py"):
mod = mod[:-3]
else:
path = []
dict = readmodule_ex(mod, path)
objs = list(dict.values())
objs.sort(key=lambda a: getattr(a, 'lineno', 0))
for obj in objs:
if isinstance(obj, Class):
print("class", obj.name, obj.super, obj.lineno)
methods = sorted(obj.methods.items(), key=itemgetter(1))
for name, lineno in methods:
if name != "__path__":
print(" def", name, lineno)
elif isinstance(obj, Function):
print("def", obj.name, obj.lineno)
if __name__ == "__main__":
_main()
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