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comparison: UtilitiesPython2/Pep8NamingCheckerPy2.py
UtilitiesPython2/Pep8NamingCheckerPy2.py
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2013 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a checker for PEP-8 naming conventions for Python2. | |
| 8 """ | |
| 9 | |
| 10 import collections | |
| 11 import ast | |
| 12 import re | |
| 13 import os | |
| 14 | |
| 15 | |
| 16 class Pep8NamingChecker(object): | |
| 17 """ | |
| 18 Class implementing a checker for PEP-8 naming conventions for Python2. | |
| 19 """ | |
| 20 LowercaseRegex = re.compile(r"[_a-z][_a-z0-9]*$") | |
| 21 UppercaseRegexp = re.compile(r"[_A-Z][_A-Z0-9]*$") | |
| 22 CamelcaseRegexp = re.compile(r"_?[A-Z][a-zA-Z0-9]*$") | |
| 23 MixedcaseRegexp = re.compile(r"_?[a-z][a-zA-Z0-9]*$") | |
| 24 | |
| 25 Codes = [ | |
| 26 "N801", "N802", "N803", "N804", "N805", "N806", "N807", "N808", | |
| 27 "N811", "N812", "N813", "N814", "N821", "N831" | |
| 28 ] | |
| 29 | |
| 30 def __init__(self, tree, filename): | |
| 31 """ | |
| 32 Constructor (according to pep8.py API) | |
| 33 | |
| 34 @param tree AST tree of the source file | |
| 35 @param filename name of the source file (string) | |
| 36 """ | |
| 37 self.__parents = collections.deque() | |
| 38 self.__tree = tree | |
| 39 self.__filename = filename | |
| 40 | |
| 41 self.__checkers = { | |
| 42 "classdef": [self.__checkClassName], | |
| 43 "functiondef": [self.__checkFuntionName, | |
| 44 self.__checkFunctionArgumentNames, | |
| 45 ], | |
| 46 "assign": [self.__checkVariablesInFunction], | |
| 47 "importfrom": [self.__checkImportAs], | |
| 48 "module": [self.__checkModule], | |
| 49 } | |
| 50 | |
| 51 def run(self): | |
| 52 """ | |
| 53 Public method run by the pep8.py checker. | |
| 54 | |
| 55 @return tuple giving line number, offset within line, code and | |
| 56 checker function | |
| 57 """ | |
| 58 if self.__tree: | |
| 59 return self.__visitTree(self.__tree) | |
| 60 else: | |
| 61 return () | |
| 62 | |
| 63 def __visitTree(self, node): | |
| 64 """ | |
| 65 Private method to scan the given AST tree. | |
| 66 | |
| 67 @param node AST tree node to scan | |
| 68 @return tuple giving line number, offset within line, code and | |
| 69 checker function | |
| 70 """ | |
| 71 for error in self.__visitNode(node): | |
| 72 yield error | |
| 73 self.__parents.append(node) | |
| 74 for child in ast.iter_child_nodes(node): | |
| 75 for error in self.__visitTree(child): | |
| 76 yield error | |
| 77 self.__parents.pop() | |
| 78 | |
| 79 def __visitNode(self, node): | |
| 80 """ | |
| 81 Private method to inspect the given AST node. | |
| 82 | |
| 83 @param node AST tree node to inspect | |
| 84 @return tuple giving line number, offset within line, code and | |
| 85 checker function | |
| 86 """ | |
| 87 if isinstance(node, ast.ClassDef): | |
| 88 self.__tagClassFunctions(node) | |
| 89 elif isinstance(node, ast.FunctionDef): | |
| 90 self.__findGlobalDefs(node) | |
| 91 | |
| 92 checkerName = node.__class__.__name__.lower() | |
| 93 if checkerName in self.__checkers: | |
| 94 for checker in self.__checkers[checkerName]: | |
| 95 for error in checker(node, self.__parents): | |
| 96 yield error + (self.__checkers[checkerName],) | |
| 97 | |
| 98 def __tagClassFunctions(self, classNode): | |
| 99 """ | |
| 100 Private method to tag functions if they are methods, class methods or | |
| 101 static methods. | |
| 102 | |
| 103 @param classNode AST tree node to tag | |
| 104 """ | |
| 105 # try to find all 'old style decorators' like | |
| 106 # m = staticmethod(m) | |
| 107 lateDecoration = {} | |
| 108 for node in ast.iter_child_nodes(classNode): | |
| 109 if not (isinstance(node, ast.Assign) and | |
| 110 isinstance(node.value, ast.Call) and | |
| 111 isinstance(node.value.func, ast.Name)): | |
| 112 continue | |
| 113 funcName = node.value.func.id | |
| 114 if funcName in ("classmethod", "staticmethod"): | |
| 115 meth = (len(node.value.args) == 1 and node.value.args[0]) | |
| 116 if isinstance(meth, ast.Name): | |
| 117 lateDecoration[meth.id] = funcName | |
| 118 | |
| 119 # iterate over all functions and tag them | |
| 120 for node in ast.iter_child_nodes(classNode): | |
| 121 if not isinstance(node, ast.FunctionDef): | |
| 122 continue | |
| 123 | |
| 124 node.function_type = 'method' | |
| 125 if node.name == "__new__": | |
| 126 node.function_type = "classmethod" | |
| 127 | |
| 128 if node.name in lateDecoration: | |
| 129 node.function_type = lateDecoration[node.name] | |
| 130 elif node.decorator_list: | |
| 131 names = [d.id for d in node.decorator_list | |
| 132 if isinstance(d, ast.Name) and | |
| 133 d.id in ("classmethod", "staticmethod")] | |
| 134 if names: | |
| 135 node.function_type = names[0] | |
| 136 | |
| 137 def __findGlobalDefs(self, functionNode): | |
| 138 """ | |
| 139 Private method amend a node with global definitions information. | |
| 140 | |
| 141 @param functionNode AST tree node to amend | |
| 142 """ | |
| 143 globalNames = set() | |
| 144 nodesToCheck = collections.deque(ast.iter_child_nodes(functionNode)) | |
| 145 while nodesToCheck: | |
| 146 node = nodesToCheck.pop() | |
| 147 if isinstance(node, ast.Global): | |
| 148 globalNames.update(node.names) | |
| 149 | |
| 150 if not isinstance(node, (ast.FunctionDef, ast.ClassDef)): | |
| 151 nodesToCheck.extend(ast.iter_child_nodes(node)) | |
| 152 functionNode.global_names = globalNames | |
| 153 | |
| 154 def __getArgNames(self, node): | |
| 155 """ | |
| 156 Private method to get the argument names of a function node. | |
| 157 | |
| 158 @param node AST node to extract arguments names from | |
| 159 @return list of argument names (list of string) | |
| 160 """ | |
| 161 def unpackArgs(args): | |
| 162 """ | |
| 163 Local helper function to unpack function argument names. | |
| 164 | |
| 165 @param args list of AST node arguments | |
| 166 @return list of argument names (list of string) | |
| 167 """ | |
| 168 ret = [] | |
| 169 for arg in args: | |
| 170 if isinstance(arg, ast.Tuple): | |
| 171 ret.extend(unpackArgs(arg.elts)) | |
| 172 else: | |
| 173 ret.append(arg.id) | |
| 174 return ret | |
| 175 | |
| 176 return unpackArgs(node.args.args) | |
| 177 | |
| 178 def __error(self, node, code): | |
| 179 """ | |
| 180 Private method to build the error information | |
| 181 | |
| 182 @param node AST node to report an error for | |
| 183 @param code error code to report (string) | |
| 184 @return tuple giving line number, offset within line and error code | |
| 185 (integer, integer, string) | |
| 186 """ | |
| 187 if isinstance(node, ast.Module): | |
| 188 lineno = 0 | |
| 189 offset = 0 | |
| 190 else: | |
| 191 lineno = node.lineno | |
| 192 offset = node.col_offset | |
| 193 if isinstance(node, ast.ClassDef): | |
| 194 lineno += len(node.decorator_list) | |
| 195 offset += 6 | |
| 196 elif isinstance(node, ast.FunctionDef): | |
| 197 lineno += len(node.decorator_list) | |
| 198 offset += 4 | |
| 199 return (lineno, offset, code) | |
| 200 | |
| 201 def __isNameToBeAvoided(self, name): | |
| 202 """ | |
| 203 Private method to check, if the given name should be avoided. | |
| 204 | |
| 205 @param name name to be checked (string) | |
| 206 @return flag indicating to avoid it (boolen) | |
| 207 """ | |
| 208 return name in ("l", "O", "I") | |
| 209 | |
| 210 def __checkClassName(self, node, parents): | |
| 211 """ | |
| 212 Private class to check the given node for class name | |
| 213 conventions (N801, N831). | |
| 214 | |
| 215 Almost without exception, class names use the CapWords convention. | |
| 216 Classes for internal use have a leading underscore in addition. | |
| 217 | |
| 218 @param node AST note to check | |
| 219 @return tuple giving line number, offset within line and error code | |
| 220 (integer, integer, string) | |
| 221 """ | |
| 222 if self.__isNameToBeAvoided(node.name): | |
| 223 yield self.__error(node, "N831") | |
| 224 return | |
| 225 | |
| 226 if not self.CamelcaseRegexp.match(node.name): | |
| 227 yield self.__error(node, "N801") | |
| 228 | |
| 229 def __checkFuntionName(self, node, parents): | |
| 230 """ | |
| 231 Private class to check the given node for function name | |
| 232 conventions (N802, N831). | |
| 233 | |
| 234 Function names should be lowercase, with words separated by underscores | |
| 235 as necessary to improve readability. Functions <b>not</b> being | |
| 236 methods '__' in front and back are not allowed. Mixed case is allowed | |
| 237 only in contexts where that's already the prevailing style | |
| 238 (e.g. threading.py), to retain backwards compatibility. | |
| 239 | |
| 240 @param node AST note to check | |
| 241 @return tuple giving line number, offset within line and error code | |
| 242 (integer, integer, string) | |
| 243 """ | |
| 244 functionType = getattr(node, "function_type", "function") | |
| 245 name = node.name | |
| 246 if self.__isNameToBeAvoided(name): | |
| 247 yield self.__error(node, "N831") | |
| 248 return | |
| 249 | |
| 250 if (functionType == "function" and "__" in (name[:2], name[-2:])) or \ | |
| 251 not self.LowercaseRegex.match(name): | |
| 252 yield self.__error(node, "N802") | |
| 253 | |
| 254 def __checkFunctionArgumentNames(self, node, parents): | |
| 255 """ | |
| 256 Private class to check the argument names of functions | |
| 257 (N803, N804, N805, N806, N831). | |
| 258 | |
| 259 The argument names of a function should be lowercase, with words | |
| 260 separated by underscores. A class method should have 'cls' as the | |
| 261 first argument. A method should have 'self' as the first argument. | |
| 262 | |
| 263 @param node AST note to check | |
| 264 @return tuple giving line number, offset within line and error code | |
| 265 (integer, integer, string) | |
| 266 """ | |
| 267 if node.args.kwarg is not None: | |
| 268 if not self.LowercaseRegex.match(node.args.kwarg): | |
| 269 yield self.__error(node, "N803") | |
| 270 return | |
| 271 | |
| 272 if node.args.vararg is not None: | |
| 273 if not self.LowercaseRegex.match(node.args.vararg): | |
| 274 yield self.__error(node, "N803") | |
| 275 return | |
| 276 | |
| 277 argNames = self.__getArgNames(node) | |
| 278 functionType = getattr(node, "function_type", "function") | |
| 279 | |
| 280 if not argNames: | |
| 281 if functionType == "method": | |
| 282 yield self.__error(node, "N805") | |
| 283 elif functionType == "classmethod": | |
| 284 yield self.__error(node, "N804") | |
| 285 return | |
| 286 | |
| 287 if functionType == "method": | |
| 288 if argNames[0] != "self": | |
| 289 yield self.__error(node, "N805") | |
| 290 elif functionType == "classmethod": | |
| 291 if argNames[0] != "cls": | |
| 292 yield self.__error(node, "N804") | |
| 293 elif functionType == "staticmethod": | |
| 294 if argNames[0] in ("cls", "self"): | |
| 295 yield self.__error(node, "N806") | |
| 296 for arg in argNames: | |
| 297 if self.__isNameToBeAvoided(arg): | |
| 298 yield self.__error(node, "N831") | |
| 299 return | |
| 300 | |
| 301 if not self.LowercaseRegex.match(arg): | |
| 302 yield self.__error(node, "N803") | |
| 303 return | |
| 304 | |
| 305 def __checkVariablesInFunction(self, node, parents): | |
| 306 """ | |
| 307 Private method to check local variables in functions (N821, N831). | |
| 308 | |
| 309 Local variables in functions should be lowercase. | |
| 310 | |
| 311 @param node AST note to check | |
| 312 @return tuple giving line number, offset within line and error code | |
| 313 (integer, integer, string) | |
| 314 """ | |
| 315 for parentFunc in reversed(parents): | |
| 316 if isinstance(parentFunc, ast.ClassDef): | |
| 317 return | |
| 318 if isinstance(parentFunc, ast.FunctionDef): | |
| 319 break | |
| 320 else: | |
| 321 return | |
| 322 for target in node.targets: | |
| 323 name = isinstance(target, ast.Name) and target.id | |
| 324 if not name or name in parentFunc.global_names: | |
| 325 return | |
| 326 | |
| 327 if self.__isNameToBeAvoided(name): | |
| 328 yield self.__error(node, "N831") | |
| 329 return | |
| 330 | |
| 331 if not self.LowercaseRegex.match(name) and name[:1] != '_': | |
| 332 yield self.__error(target, "N821") | |
| 333 | |
| 334 def __checkModule(self, node, parents): | |
| 335 """ | |
| 336 Private method to check module naming conventions (N807, N808). | |
| 337 | |
| 338 Module and package names should be lowercase. | |
| 339 | |
| 340 @param node AST note to check | |
| 341 @return tuple giving line number, offset within line and error code | |
| 342 (integer, integer, string) | |
| 343 """ | |
| 344 if self.__filename: | |
| 345 moduleName = os.path.splitext(os.path.basename(self.__filename))[0] | |
| 346 if moduleName.lower() != moduleName: | |
| 347 yield self.__error(node, "N807") | |
| 348 | |
| 349 if moduleName == "__init__": | |
| 350 # we got a package | |
| 351 packageName = \ | |
| 352 os.path.split(os.path.dirname(self.__filename))[1] | |
| 353 if packageName.lower != packageName: | |
| 354 yield self.__error(node, "N808") | |
| 355 | |
| 356 def __checkImportAs(self, node, parents): | |
| 357 """ | |
| 358 Private method to check that imports don't change the | |
| 359 naming convention (N811, N812, N813, N814). | |
| 360 | |
| 361 @param node AST note to check | |
| 362 @return tuple giving line number, offset within line and error code | |
| 363 (integer, integer, string) | |
| 364 """ | |
| 365 for name in node.names: | |
| 366 if not name.asname: | |
| 367 continue | |
| 368 | |
| 369 if self.UppercaseRegexp.match(name.name): | |
| 370 if not self.UppercaseRegexp.match(name.asname): | |
| 371 yield self.__error(node, "N811") | |
| 372 elif self.LowercaseRegex.match(name.name): | |
| 373 if not self.LowercaseRegex.match(name.asname): | |
| 374 yield self.__error(node, "N812") | |
| 375 elif self.LowercaseRegex.match(name.asname): | |
| 376 yield self.__error(node, "N813") | |
| 377 elif self.UppercaseRegexp.match(name.asname): | |
| 378 yield self.__error(node, "N814") | |
| 379 | |
| 380 # | |
| 381 # eflag: FileType = Python2 |
