| 1 | """Parse a Python module and describe its classes and methods.
|
|---|
| 2 |
|
|---|
| 3 | Parse enough of a Python file to recognize imports and class and
|
|---|
| 4 | method definitions, and to find out the superclasses of a class.
|
|---|
| 5 |
|
|---|
| 6 | The interface consists of a single function:
|
|---|
| 7 | readmodule_ex(module [, path])
|
|---|
| 8 | where module is the name of a Python module, and path is an optional
|
|---|
| 9 | list of directories where the module is to be searched. If present,
|
|---|
| 10 | path is prepended to the system search path sys.path. The return
|
|---|
| 11 | value is a dictionary. The keys of the dictionary are the names of
|
|---|
| 12 | the classes defined in the module (including classes that are defined
|
|---|
| 13 | via the from XXX import YYY construct). The values are class
|
|---|
| 14 | instances of the class Class defined here. One special key/value pair
|
|---|
| 15 | is present for packages: the key '__path__' has a list as its value
|
|---|
| 16 | which contains the package search path.
|
|---|
| 17 |
|
|---|
| 18 | A class is described by the class Class in this module. Instances
|
|---|
| 19 | of this class have the following instance variables:
|
|---|
| 20 | module -- the module name
|
|---|
| 21 | name -- the name of the class
|
|---|
| 22 | super -- a list of super classes (Class instances)
|
|---|
| 23 | methods -- a dictionary of methods
|
|---|
| 24 | file -- the file in which the class was defined
|
|---|
| 25 | lineno -- the line in the file on which the class statement occurred
|
|---|
| 26 | The dictionary of methods uses the method names as keys and the line
|
|---|
| 27 | numbers on which the method was defined as values.
|
|---|
| 28 | If the name of a super class is not recognized, the corresponding
|
|---|
| 29 | entry in the list of super classes is not a class instance but a
|
|---|
| 30 | string giving the name of the super class. Since import statements
|
|---|
| 31 | are recognized and imported modules are scanned as well, this
|
|---|
| 32 | shouldn't happen often.
|
|---|
| 33 |
|
|---|
| 34 | A function is described by the class Function in this module.
|
|---|
| 35 | Instances of this class have the following instance variables:
|
|---|
| 36 | module -- the module name
|
|---|
| 37 | name -- the name of the class
|
|---|
| 38 | file -- the file in which the class was defined
|
|---|
| 39 | lineno -- the line in the file on which the class statement occurred
|
|---|
| 40 | """
|
|---|
| 41 |
|
|---|
| 42 | import sys
|
|---|
| 43 | import imp
|
|---|
| 44 | import tokenize # Python tokenizer
|
|---|
| 45 | from token import NAME, DEDENT, NEWLINE, OP
|
|---|
| 46 | from operator import itemgetter
|
|---|
| 47 |
|
|---|
| 48 | __all__ = ["readmodule", "readmodule_ex", "Class", "Function"]
|
|---|
| 49 |
|
|---|
| 50 | _modules = {} # cache of modules we've seen
|
|---|
| 51 |
|
|---|
| 52 | # each Python class is represented by an instance of this class
|
|---|
| 53 | class Class:
|
|---|
| 54 | '''Class to represent a Python class.'''
|
|---|
| 55 | def __init__(self, module, name, super, file, lineno):
|
|---|
| 56 | self.module = module
|
|---|
| 57 | self.name = name
|
|---|
| 58 | if super is None:
|
|---|
| 59 | super = []
|
|---|
| 60 | self.super = super
|
|---|
| 61 | self.methods = {}
|
|---|
| 62 | self.file = file
|
|---|
| 63 | self.lineno = lineno
|
|---|
| 64 |
|
|---|
| 65 | def _addmethod(self, name, lineno):
|
|---|
| 66 | self.methods[name] = lineno
|
|---|
| 67 |
|
|---|
| 68 | class Function:
|
|---|
| 69 | '''Class to represent a top-level Python function'''
|
|---|
| 70 | def __init__(self, module, name, file, lineno):
|
|---|
| 71 | self.module = module
|
|---|
| 72 | self.name = name
|
|---|
| 73 | self.file = file
|
|---|
| 74 | self.lineno = lineno
|
|---|
| 75 |
|
|---|
| 76 | def readmodule(module, path=[]):
|
|---|
| 77 | '''Backwards compatible interface.
|
|---|
| 78 |
|
|---|
| 79 | Call readmodule_ex() and then only keep Class objects from the
|
|---|
| 80 | resulting dictionary.'''
|
|---|
| 81 |
|
|---|
| 82 | dict = _readmodule(module, path)
|
|---|
| 83 | res = {}
|
|---|
| 84 | for key, value in dict.items():
|
|---|
| 85 | if isinstance(value, Class):
|
|---|
| 86 | res[key] = value
|
|---|
| 87 | return res
|
|---|
| 88 |
|
|---|
| 89 | def readmodule_ex(module, path=[]):
|
|---|
| 90 | '''Read a module file and return a dictionary of classes.
|
|---|
| 91 |
|
|---|
| 92 | Search for MODULE in PATH and sys.path, read and parse the
|
|---|
| 93 | module and return a dictionary with one entry for each class
|
|---|
| 94 | found in the module.
|
|---|
| 95 |
|
|---|
| 96 | If INPACKAGE is true, it must be the dotted name of the package in
|
|---|
| 97 | which we are searching for a submodule, and then PATH must be the
|
|---|
| 98 | package search path; otherwise, we are searching for a top-level
|
|---|
| 99 | module, and PATH is combined with sys.path.
|
|---|
| 100 | '''
|
|---|
| 101 | return _readmodule(module, path)
|
|---|
| 102 |
|
|---|
| 103 | def _readmodule(module, path, inpackage=None):
|
|---|
| 104 | '''Do the hard work for readmodule[_ex].'''
|
|---|
| 105 | # Compute the full module name (prepending inpackage if set)
|
|---|
| 106 | if inpackage:
|
|---|
| 107 | fullmodule = "%s.%s" % (inpackage, module)
|
|---|
| 108 | else:
|
|---|
| 109 | fullmodule = module
|
|---|
| 110 |
|
|---|
| 111 | # Check in the cache
|
|---|
| 112 | if fullmodule in _modules:
|
|---|
| 113 | return _modules[fullmodule]
|
|---|
| 114 |
|
|---|
| 115 | # Initialize the dict for this module's contents
|
|---|
| 116 | dict = {}
|
|---|
| 117 |
|
|---|
| 118 | # Check if it is a built-in module; we don't do much for these
|
|---|
| 119 | if module in sys.builtin_module_names and not inpackage:
|
|---|
| 120 | _modules[module] = dict
|
|---|
| 121 | return dict
|
|---|
| 122 |
|
|---|
| 123 | # Check for a dotted module name
|
|---|
| 124 | i = module.rfind('.')
|
|---|
| 125 | if i >= 0:
|
|---|
| 126 | package = module[:i]
|
|---|
| 127 | submodule = module[i+1:]
|
|---|
| 128 | parent = _readmodule(package, path, inpackage)
|
|---|
| 129 | if inpackage:
|
|---|
| 130 | package = "%s.%s" % (inpackage, package)
|
|---|
| 131 | return _readmodule(submodule, parent['__path__'], package)
|
|---|
| 132 |
|
|---|
| 133 | # Search the path for the module
|
|---|
| 134 | f = None
|
|---|
| 135 | if inpackage:
|
|---|
| 136 | f, file, (suff, mode, type) = imp.find_module(module, path)
|
|---|
| 137 | else:
|
|---|
| 138 | f, file, (suff, mode, type) = imp.find_module(module, path + sys.path)
|
|---|
| 139 | if type == imp.PKG_DIRECTORY:
|
|---|
| 140 | dict['__path__'] = [file]
|
|---|
| 141 | path = [file] + path
|
|---|
| 142 | f, file, (suff, mode, type) = imp.find_module('__init__', [file])
|
|---|
| 143 | _modules[fullmodule] = dict
|
|---|
| 144 | if type != imp.PY_SOURCE:
|
|---|
| 145 | # not Python source, can't do anything with this module
|
|---|
| 146 | f.close()
|
|---|
| 147 | return dict
|
|---|
| 148 |
|
|---|
| 149 | stack = [] # stack of (class, indent) pairs
|
|---|
| 150 |
|
|---|
| 151 | g = tokenize.generate_tokens(f.readline)
|
|---|
| 152 | try:
|
|---|
| 153 | for tokentype, token, start, end, line in g:
|
|---|
| 154 | if tokentype == DEDENT:
|
|---|
| 155 | lineno, thisindent = start
|
|---|
| 156 | # close nested classes and defs
|
|---|
| 157 | while stack and stack[-1][1] >= thisindent:
|
|---|
| 158 | del stack[-1]
|
|---|
| 159 | elif token == 'def':
|
|---|
| 160 | lineno, thisindent = start
|
|---|
| 161 | # close previous nested classes and defs
|
|---|
| 162 | while stack and stack[-1][1] >= thisindent:
|
|---|
| 163 | del stack[-1]
|
|---|
| 164 | tokentype, meth_name, start, end, line = g.next()
|
|---|
| 165 | if tokentype != NAME:
|
|---|
| 166 | continue # Syntax error
|
|---|
| 167 | if stack:
|
|---|
| 168 | cur_class = stack[-1][0]
|
|---|
| 169 | if isinstance(cur_class, Class):
|
|---|
| 170 | # it's a method
|
|---|
| 171 | cur_class._addmethod(meth_name, lineno)
|
|---|
| 172 | # else it's a nested def
|
|---|
| 173 | else:
|
|---|
| 174 | # it's a function
|
|---|
| 175 | dict[meth_name] = Function(module, meth_name, file, lineno)
|
|---|
| 176 | stack.append((None, thisindent)) # Marker for nested fns
|
|---|
| 177 | elif token == 'class':
|
|---|
| 178 | lineno, thisindent = start
|
|---|
| 179 | # close previous nested classes and defs
|
|---|
| 180 | while stack and stack[-1][1] >= thisindent:
|
|---|
| 181 | del stack[-1]
|
|---|
| 182 | tokentype, class_name, start, end, line = g.next()
|
|---|
| 183 | if tokentype != NAME:
|
|---|
| 184 | continue # Syntax error
|
|---|
| 185 | # parse what follows the class name
|
|---|
| 186 | tokentype, token, start, end, line = g.next()
|
|---|
| 187 | inherit = None
|
|---|
| 188 | if token == '(':
|
|---|
| 189 | names = [] # List of superclasses
|
|---|
| 190 | # there's a list of superclasses
|
|---|
| 191 | level = 1
|
|---|
| 192 | super = [] # Tokens making up current superclass
|
|---|
| 193 | while True:
|
|---|
| 194 | tokentype, token, start, end, line = g.next()
|
|---|
| 195 | if token in (')', ',') and level == 1:
|
|---|
| 196 | n = "".join(super)
|
|---|
| 197 | if n in dict:
|
|---|
| 198 | # we know this super class
|
|---|
| 199 | n = dict[n]
|
|---|
| 200 | else:
|
|---|
| 201 | c = n.split('.')
|
|---|
| 202 | if len(c) > 1:
|
|---|
| 203 | # super class is of the form
|
|---|
| 204 | # module.class: look in module for
|
|---|
| 205 | # class
|
|---|
| 206 | m = c[-2]
|
|---|
| 207 | c = c[-1]
|
|---|
| 208 | if m in _modules:
|
|---|
| 209 | d = _modules[m]
|
|---|
| 210 | if c in d:
|
|---|
| 211 | n = d[c]
|
|---|
| 212 | names.append(n)
|
|---|
| 213 | super = []
|
|---|
| 214 | if token == '(':
|
|---|
| 215 | level += 1
|
|---|
| 216 | elif token == ')':
|
|---|
| 217 | level -= 1
|
|---|
| 218 | if level == 0:
|
|---|
| 219 | break
|
|---|
| 220 | elif token == ',' and level == 1:
|
|---|
| 221 | pass
|
|---|
| 222 | # only use NAME and OP (== dot) tokens for type name
|
|---|
| 223 | elif tokentype in (NAME, OP) and level == 1:
|
|---|
| 224 | super.append(token)
|
|---|
| 225 | # expressions in the base list are not supported
|
|---|
| 226 | inherit = names
|
|---|
| 227 | cur_class = Class(fullmodule, class_name, inherit, file, lineno)
|
|---|
| 228 | if not stack:
|
|---|
| 229 | dict[class_name] = cur_class
|
|---|
| 230 | stack.append((cur_class, thisindent))
|
|---|
| 231 | elif token == 'import' and start[1] == 0:
|
|---|
| 232 | modules = _getnamelist(g)
|
|---|
| 233 | for mod, mod2 in modules:
|
|---|
| 234 | try:
|
|---|
|
|---|
