1 #!/usr/bin/env python 2 3 import ihooks # for the import machinery 4 import os, glob # for getting suitably-named files 5 from imp import PY_SOURCE, PKG_DIRECTORY, C_BUILTIN # import machinery magic 6 import classfile, bytecode # Java class support 7 import zipfile # for Java archive inspection 8 9 # NOTE: Arbitrary constants pulled from thin air. 10 11 JAVA_PACKAGE = 20041113 12 JAVA_CLASS = 20041114 13 JAVA_ARCHIVE = 20041115 14 15 class ClassHooks(ihooks.Hooks): 16 17 "A filesystem hooks class providing information about supported files." 18 19 def get_suffixes(self): 20 21 "Return the recognised suffixes." 22 23 return [("", "", JAVA_PACKAGE), (os.extsep + "jar", "r", JAVA_ARCHIVE)] + ihooks.Hooks.get_suffixes(self) 24 25 def path_isdir(self, x, archive=None): 26 27 "Return whether 'x' is a directory in the given 'archive'." 28 29 if archive is None: 30 return ihooks.Hooks.path_isdir(self, x) 31 32 return self._get_dirname(x) in archive.namelist() 33 34 def _get_dirname(self, x): 35 36 """ 37 Return the directory name for 'x'. 38 In zip files, the presence of "/" seems to indicate a directory. 39 """ 40 41 if x.endswith("/"): 42 return x 43 else: 44 return x + "/" 45 46 def listdir(self, x, archive=None): 47 48 "Return the contents of the directory 'x' in the given 'archive'." 49 50 if archive is None: 51 return ihooks.Hooks.listdir(self, x) 52 53 x = self._get_dirname(x) 54 l = [] 55 for path in archive.namelist(): 56 57 # Find out if the path is within the given directory. 58 59 if path != x and path.startswith(x): 60 61 # Get the path below the given directory. 62 63 subpath = path[len(x):] 64 65 # Find out whether the path is an object in the current directory. 66 67 if subpath.count("/") == 0 or subpath.count("/") == 1 and subpath.endswith("/"): 68 l.append(subpath) 69 70 return l 71 72 def matching(self, dir, extension, archive=None): 73 74 """ 75 Return the matching files in the given directory 'dir' having the given 76 'extension' within the given 'archive'. Produce a list containing full 77 paths as opposed to simple filenames. 78 """ 79 80 if archive is None: 81 return glob.glob(self.path_join(dir, "*" + extension)) 82 83 dir = self._get_dirname(dir) 84 l = [] 85 for path in self.listdir(dir, archive): 86 if path.endswith(extension): 87 l.append(self.path_join(dir, path)) 88 return l 89 90 def read(self, filename, archive=None): 91 92 """ 93 Return the contents of the file with the given 'filename' in the given 94 'archive'. 95 """ 96 97 if archive is None: 98 f = open(filename, "rb") 99 s = f.read() 100 f.close() 101 return s 102 return archive.read(filename) 103 104 class ClassLoader(ihooks.ModuleLoader): 105 106 "A class providing support for searching directories for supported files." 107 108 def find_module_in_dir(self, name, dir, allow_packages=1): 109 110 """ 111 Find the module with the given 'name' in the given directory 'dir'. 112 Since Java packages/modules are directories containing class files, 113 return the required information tuple only when the path constructed 114 from 'dir' and 'name' refers to a directory containing class files. 115 """ 116 117 result = ihooks.ModuleLoader.find_module_in_dir(self, name, dir, allow_packages) 118 if result is not None: 119 return result 120 121 # An archive may be opened. 122 123 archive = None 124 125 # Provide a special name for the current directory. 126 127 if name == "__this__": 128 path = "." 129 130 # Where no directory is given, return failure immediately. 131 132 elif dir is None: 133 return None 134 135 # Detect archives. 136 137 else: 138 archive, archive_path, path = self._get_archive_and_path(dir, name) 139 140 print "Processing name", name, "in", dir, "producing", path, "within archive", archive 141 142 if self._find_module_at_path(path, archive): 143 if archive is not None: 144 return (archive, archive_path + ":" + path, (os.extsep + "jar", "r", JAVA_ARCHIVE)) 145 else: 146 return (None, path, ("", "", JAVA_PACKAGE)) 147 else: 148 return None 149 150 def _get_archive_and_path(self, dir, name): 151 parts = dir.split(":") 152 archive_path = parts[0] 153 154 # Archives may include an internal path, but will in any case have 155 # a primary part ending in .jar. 156 157 if archive_path.endswith(os.extsep + "jar"): 158 archive = zipfile.ZipFile(archive_path, "r") 159 path = self.hooks.path_join(":".join(parts[1:]), name) 160 161 # Otherwise, produce a filesystem-based path. 162 163 else: 164 archive = None 165 path = self.hooks.path_join(dir, name) 166 167 return archive, archive_path, path 168 169 def _get_path_in_archive(self, path): 170 parts = path.split(":") 171 if len(parts) == 1: 172 return parts[0] 173 else: 174 return ":".join(parts[1:]) 175 176 def _find_module_at_path(self, path, archive): 177 if self.hooks.path_isdir(path, archive): 178 print "Looking in", path, "using archive", archive 179 180 # Look for classes in the directory. 181 182 if len(self.hooks.matching(path, os.extsep + "class", archive)) != 0: 183 return 1 184 185 # Otherwise permit importing where directories containing classes exist. 186 187 print "Filenames are", self.hooks.listdir(path, archive) 188 for filename in self.hooks.listdir(path, archive): 189 pathname = self.hooks.path_join(path, filename) 190 result = self._find_module_at_path(pathname, archive) 191 if result is not None: 192 return result 193 194 return 0 195 196 def load_module(self, name, stuff): 197 198 """ 199 Load the module with the given 'name', whose 'stuff' which describes the 200 location of the module is a tuple of the form (file, filename, (suffix, 201 mode, data type)). Return a module object or raise an ImportError if a 202 problem occurred in the import operation. 203 """ 204 205 # Just go into the directory and find the class files. 206 207 archive, filename, info = stuff 208 suffix, mode, datatype = info 209 if datatype not in (JAVA_PACKAGE, JAVA_ARCHIVE): 210 return ihooks.ModuleLoader.load_module(self, name, stuff) 211 212 print "Loading", archive, filename, info 213 214 # Set up the module. 215 216 module = self.hooks.add_module(name) 217 module.__path__ = [filename] 218 219 # Prepare a dictionary of globals. 220 221 global_names = module.__dict__ 222 global_names["__builtins__"] = __builtins__ 223 224 # Process each class file, producing a genuine Python class. 225 226 class_files = [] 227 classes = [] 228 229 # Get the real filename. 230 231 filename = self._get_path_in_archive(filename) 232 print "Real filename", filename 233 234 # Load the class files. 235 236 class_files = {} 237 for class_filename in self.hooks.matching(filename, os.extsep + "class", archive): 238 print "Loading class", class_filename 239 s = self.hooks.read(class_filename, archive) 240 class_file = classfile.ClassFile(s) 241 class_files[str(class_file.this_class.get_name())] = class_file 242 243 # Get an index of the class files. 244 245 class_file_index = class_files.keys() 246 247 # NOTE: Unnecessary sorting for test purposes. 248 249 class_file_index.sort() 250 251 # Now go through the classes arranging them in a safe loading order. 252 253 position = 0 254 while position < len(class_file_index): 255 class_name = class_file_index[position] 256 super_class_name = str(class_files[class_name].super_class.get_name()) 257 258 # Discover whether the superclass appears later. 259 260 try: 261 super_class_position = class_file_index.index(super_class_name) 262 if super_class_position > position: 263 264 # If the superclass appears later, swap this class and the 265 # superclass, then process the superclass. 266 267 class_file_index[position] = super_class_name 268 class_file_index[super_class_position] = class_name 269 continue 270 271 except ValueError: 272 pass 273 274 position += 1 275 276 class_files = [class_files[class_name] for class_name in class_file_index] 277 278 for class_file in class_files: 279 translator = bytecode.ClassTranslator(class_file) 280 cls, external_names = translator.process(global_names) 281 module.__dict__[cls.__name__] = cls 282 classes.append((cls, class_file)) 283 284 # Import the local names. 285 286 for external_name in external_names: 287 external_name_parts = external_name.split(".") 288 if len(external_name_parts) > 1: 289 external_module_name = ".".join(external_name_parts[:-1]) 290 print "* Importing", external_module_name 291 obj = __import__(external_module_name, global_names, {}, []) 292 global_names[external_name_parts[0]] = obj 293 294 # Finally, call __clinit__ methods for all relevant classes. 295 296 for cls, class_file in classes: 297 print "**", cls, class_file 298 if hasattr(cls, "__clinit__"): 299 eval(cls.__clinit__.func_code, global_names) 300 301 return module 302 303 ihooks.ModuleImporter(loader=ClassLoader(hooks=ClassHooks())).install() 304 305 # vim: tabstop=4 expandtab shiftwidth=4