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4b8c6eaf8b
*this* set of patches is Ka-Ping's final sweep: The attached patches update the standard library so that all modules have docstrings beginning with one-line summaries. A new docstring was added to formatter. The docstring for os.py was updated to mention nt, os2, ce in addition to posix, dos, mac.
337 lines
9.3 KiB
Python
337 lines
9.3 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(module, path)
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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.
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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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BUGS
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- Continuation lines are not dealt with at all.
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- While triple-quoted strings won't confuse it, lines that look like
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def, class, import or "from ... import" stmts inside backslash-continued
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single-quoted strings are treated like code. The expense of stopping
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that isn't worth it.
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- Code that doesn't pass tabnanny or python -t will confuse it, unless
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you set the module TABWIDTH vrbl (default 8) to the correct tab width
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for the file.
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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 os
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import sys
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import imp
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import re
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import string
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TABWIDTH = 8
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_getnext = re.compile(r"""
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(?P<String>
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\""" [^"\\]* (?:
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(?: \\. | "(?!"") )
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[^"\\]*
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)*
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\"""
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| ''' [^'\\]* (?:
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(?: \\. | '(?!'') )
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[^'\\]*
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)*
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'''
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)
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| (?P<Method>
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^
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(?P<MethodIndent> [ \t]* )
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def [ \t]+
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(?P<MethodName> [a-zA-Z_] \w* )
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[ \t]* \(
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)
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| (?P<Class>
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^
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(?P<ClassIndent> [ \t]* )
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class [ \t]+
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(?P<ClassName> [a-zA-Z_] \w* )
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[ \t]*
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(?P<ClassSupers> \( [^)\n]* \) )?
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[ \t]* :
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)
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| (?P<Import>
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^ import [ \t]+
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(?P<ImportList> [^#;\n]+ )
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)
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| (?P<ImportFrom>
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^ from [ \t]+
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(?P<ImportFromPath>
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[a-zA-Z_] \w*
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(?:
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[ \t]* \. [ \t]* [a-zA-Z_] \w*
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)*
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)
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[ \t]+
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import [ \t]+
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(?P<ImportFromList> [^#;\n]+ )
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)
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""", re.VERBOSE | re.DOTALL | re.MULTILINE).search
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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=0):
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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=0):
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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 = string.rfind(module, '.')
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if i >= 0:
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# Dotted module name
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package = string.strip(module[:i])
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submodule = string.strip(module[i+1:])
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parent = readmodule(package, path, inpackage)
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child = readmodule(submodule, parent['__path__'], 1)
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return child
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if _modules.has_key(module):
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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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imports = []
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classstack = [] # stack of (class, indent) pairs
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src = f.read()
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f.close()
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# To avoid having to stop the regexp at each newline, instead
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# when we need a line number we simply string.count the number of
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# newlines in the string since the last time we did this; i.e.,
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# lineno = lineno + \
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# string.count(src, '\n', last_lineno_pos, here)
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# last_lineno_pos = here
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countnl = string.count
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lineno, last_lineno_pos = 1, 0
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i = 0
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while 1:
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m = _getnext(src, i)
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if not m:
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break
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start, i = m.span()
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if m.start("Method") >= 0:
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# found a method definition or function
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thisindent = _indent(m.group("MethodIndent"))
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meth_name = m.group("MethodName")
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lineno = lineno + \
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countnl(src, '\n',
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last_lineno_pos, start)
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last_lineno_pos = start
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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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f = Function(module, meth_name,
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file, lineno)
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dict[meth_name] = f
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elif m.start("String") >= 0:
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pass
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elif m.start("Class") >= 0:
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# we found a class definition
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thisindent = _indent(m.group("ClassIndent"))
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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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lineno = lineno + \
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countnl(src, '\n', last_lineno_pos, start)
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last_lineno_pos = start
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class_name = m.group("ClassName")
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inherit = m.group("ClassSupers")
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if inherit:
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# the class inherits from other classes
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inherit = string.strip(inherit[1:-1])
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names = []
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for n in string.splitfields(inherit, ','):
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n = string.strip(n)
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if dict.has_key(n):
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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 = string.splitfields(n, '.')
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if len(c) > 1:
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# super class
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# is of the
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# form module.class:
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# look in
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# module for class
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m = c[-2]
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c = c[-1]
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if _modules.has_key(m):
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d = _modules[m]
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if d.has_key(c):
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n = d[c]
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names.append(n)
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inherit = names
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# remember this class
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cur_class = Class(module, class_name, inherit,
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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 m.start("Import") >= 0:
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# import module
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for n in string.split(m.group("ImportList"), ','):
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n = string.strip(n)
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try:
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# recursively read the imported module
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d = readmodule(n, path, inpackage)
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except:
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##print 'module', n, 'not found'
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pass
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elif m.start("ImportFrom") >= 0:
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# from module import stuff
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mod = m.group("ImportFromPath")
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names = string.split(m.group("ImportFromList"), ',')
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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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##print 'module', mod, 'not found'
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continue
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# add any classes that were defined in the
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# imported module to our name space if they
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# were mentioned in the list
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for n in names:
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n = string.strip(n)
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if d.has_key(n):
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dict[n] = d[n]
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elif n == '*':
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# only add a name if not
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# already there (to mimic what
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# Python does internally)
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# also don't add names that
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# start with _
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for n in d.keys():
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if n[0] != '_' and \
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not dict.has_key(n):
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dict[n] = d[n]
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else:
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assert 0, "regexp _getnext found something unexpected"
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return dict
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def _indent(ws, _expandtabs=string.expandtabs):
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return len(_expandtabs(ws, TABWIDTH))
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