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296 lines
11 KiB
Python
296 lines
11 KiB
Python
"""Parse a Python file and retrieve classes and methods.
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Parse enough of a Python file to recognize class and method
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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[, inpackage]])
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module is the name of a Python module, path is an optional list of
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directories where the module is to be searched. If present, path is
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prepended to the system search path sys.path. (inpackage is used
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internally to search for a submodule of a package.)
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The return value is a dictionary. The keys of the dictionary are
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the names of the classes defined in the module (including classes
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that are defined via the from XXX import YYY construct). The values
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are class instances of the class Class defined here.
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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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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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XXX describe the Function class.
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BUGS
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- Nested classes and functions can confuse it.
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PACKAGE RELATED BUGS
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- If you have a package and a module inside that or another package
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with the same name, module caching doesn't work properly since the
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key is the base name of the module/package.
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- The only entry that is returned when you readmodule a package is a
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__path__ whose value is a list which confuses certain class browsers.
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- When code does:
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from package import subpackage
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class MyClass(subpackage.SuperClass):
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...
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It can't locate the parent. It probably needs to have the same
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hairy logic that the import locator already does. (This logic
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exists coded in Python in the freeze package.)
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"""
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import sys
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import imp
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import tokenize # Python tokenizer
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from token import NAME
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__all__ = ["readmodule"]
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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(Class):
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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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Class.__init__(self, module, name, None, file, lineno)
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def _addmethod(self, name, lineno):
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assert 0, "Function._addmethod() shouldn't be called"
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def readmodule(module, path=[], inpackage=False):
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'''Backwards compatible interface.
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Like readmodule_ex() but strips Function objects from the
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resulting dictionary.'''
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dict = readmodule_ex(module, path, inpackage)
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res = {}
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for key, value in dict.items():
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if not isinstance(value, Function):
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res[key] = value
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return res
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def readmodule_ex(module, path=[], inpackage=False):
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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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dict = {}
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i = module.rfind('.')
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if i >= 0:
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# Dotted module name
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package = module[:i].strip()
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submodule = module[i+1:].strip()
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parent = readmodule_ex(package, path, inpackage)
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child = readmodule_ex(submodule, parent['__path__'], True)
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return child
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if module in _modules:
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# we've seen this module before...
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return _modules[module]
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if module in sys.builtin_module_names:
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# this is a built-in module
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_modules[module] = dict
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return dict
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# search the path for the module
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f = None
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if inpackage:
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try:
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f, file, (suff, mode, type) = \
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imp.find_module(module, path)
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except ImportError:
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f = None
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if f is None:
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fullpath = list(path) + sys.path
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f, file, (suff, mode, type) = imp.find_module(module, fullpath)
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if type == imp.PKG_DIRECTORY:
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dict['__path__'] = [file]
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_modules[module] = dict
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path = [file] + path
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f, file, (suff, mode, type) = \
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imp.find_module('__init__', [file])
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if type != 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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_modules[module] = dict
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return dict
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_modules[module] = dict
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classstack = [] # 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 token == 'def':
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lineno, thisindent = start
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tokentype, meth_name, start, end, line = g.next()
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if tokentype != NAME:
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continue # Syntax error
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# close all classes indented at least as much
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while classstack and \
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classstack[-1][1] >= thisindent:
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del classstack[-1]
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if classstack:
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# it's a class method
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cur_class = classstack[-1][0]
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cur_class._addmethod(meth_name, lineno)
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else:
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# it's a function
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dict[meth_name] = Function(module, meth_name, file, lineno)
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elif token == 'class':
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lineno, thisindent = start
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tokentype, class_name, start, end, line = g.next()
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if tokentype != NAME:
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continue # Syntax error
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# close all classes indented at least as much
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while classstack and \
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classstack[-1][1] >= thisindent:
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del classstack[-1]
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# parse what follows the class name
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tokentype, token, start, end, line = g.next()
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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, end, line = g.next()
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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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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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else:
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super.append(token)
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inherit = names
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cur_class = Class(module, class_name, inherit, file, lineno)
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dict[class_name] = cur_class
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classstack.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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readmodule_ex(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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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_ex(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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# only add a name if not already there (to mimic
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# what Python does internally) also don't add
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# names that start with _
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for n in d:
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if n[0] != '_' and not n in dict:
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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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tokentype, token, start, end, line = g.next()
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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, start, end, line = g.next()
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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, start, end, line = g.next()
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if token != '.':
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break
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tokentype, token, start, end, line = g.next()
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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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