| paul@0 | 1 | #!/usr/bin/env python |
| paul@0 | 2 | |
| paul@0 | 3 | """ |
| paul@0 | 4 | Common functions. |
| paul@0 | 5 | |
| paul@0 | 6 | Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013, |
| paul@508 | 7 | 2014, 2015, 2016, 2017 Paul Boddie <paul@boddie.org.uk> |
| paul@0 | 8 | |
| paul@0 | 9 | This program is free software; you can redistribute it and/or modify it under |
| paul@0 | 10 | the terms of the GNU General Public License as published by the Free Software |
| paul@0 | 11 | Foundation; either version 3 of the License, or (at your option) any later |
| paul@0 | 12 | version. |
| paul@0 | 13 | |
| paul@0 | 14 | This program is distributed in the hope that it will be useful, but WITHOUT |
| paul@0 | 15 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| paul@0 | 16 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| paul@0 | 17 | details. |
| paul@0 | 18 | |
| paul@0 | 19 | You should have received a copy of the GNU General Public License along with |
| paul@0 | 20 | this program. If not, see <http://www.gnu.org/licenses/>. |
| paul@0 | 21 | """ |
| paul@0 | 22 | |
| paul@512 | 23 | from compiler.transformer import Transformer |
| paul@430 | 24 | from errors import InspectError |
| paul@0 | 25 | from os import listdir, makedirs, remove |
| paul@609 | 26 | from os.path import exists, getmtime, isdir, join, split |
| paul@11 | 27 | from results import ConstantValueRef, LiteralSequenceRef, NameRef |
| paul@405 | 28 | import compiler.ast |
| paul@0 | 29 | |
| paul@0 | 30 | class CommonOutput: |
| paul@0 | 31 | |
| paul@0 | 32 | "Common output functionality." |
| paul@0 | 33 | |
| paul@617 | 34 | def check_output(self, options=None): |
| paul@0 | 35 | |
| paul@0 | 36 | "Check the existing output and remove it if irrelevant." |
| paul@0 | 37 | |
| paul@0 | 38 | if not exists(self.output): |
| paul@0 | 39 | makedirs(self.output) |
| paul@0 | 40 | |
| paul@0 | 41 | details = self.importer.get_cache_details() |
| paul@0 | 42 | recorded_details = self.get_output_details() |
| paul@0 | 43 | |
| paul@617 | 44 | # Combine cache details with any options. |
| paul@617 | 45 | |
| paul@617 | 46 | full_details = options and (details + " " + options) or details |
| paul@617 | 47 | |
| paul@617 | 48 | if recorded_details != full_details: |
| paul@0 | 49 | self.remove_output() |
| paul@0 | 50 | |
| paul@617 | 51 | writefile(self.get_output_details_filename(), full_details) |
| paul@0 | 52 | |
| paul@0 | 53 | def get_output_details_filename(self): |
| paul@0 | 54 | |
| paul@0 | 55 | "Return the output details filename." |
| paul@0 | 56 | |
| paul@0 | 57 | return join(self.output, "$details") |
| paul@0 | 58 | |
| paul@0 | 59 | def get_output_details(self): |
| paul@0 | 60 | |
| paul@0 | 61 | "Return details of the existing output." |
| paul@0 | 62 | |
| paul@0 | 63 | details_filename = self.get_output_details_filename() |
| paul@0 | 64 | |
| paul@0 | 65 | if not exists(details_filename): |
| paul@0 | 66 | return None |
| paul@0 | 67 | else: |
| paul@0 | 68 | return readfile(details_filename) |
| paul@0 | 69 | |
| paul@0 | 70 | def remove_output(self, dirname=None): |
| paul@0 | 71 | |
| paul@0 | 72 | "Remove the output." |
| paul@0 | 73 | |
| paul@0 | 74 | dirname = dirname or self.output |
| paul@0 | 75 | |
| paul@0 | 76 | for filename in listdir(dirname): |
| paul@0 | 77 | path = join(dirname, filename) |
| paul@0 | 78 | if isdir(path): |
| paul@0 | 79 | self.remove_output(path) |
| paul@0 | 80 | else: |
| paul@0 | 81 | remove(path) |
| paul@0 | 82 | |
| paul@609 | 83 | def copy(source, target, only_if_newer=True): |
| paul@609 | 84 | |
| paul@609 | 85 | "Copy a text file from 'source' to 'target'." |
| paul@609 | 86 | |
| paul@609 | 87 | if isdir(target): |
| paul@609 | 88 | target = join(target, split(source)[-1]) |
| paul@609 | 89 | |
| paul@609 | 90 | if only_if_newer and not is_newer(source, target): |
| paul@609 | 91 | return |
| paul@609 | 92 | |
| paul@609 | 93 | infile = open(source) |
| paul@609 | 94 | outfile = open(target, "w") |
| paul@609 | 95 | |
| paul@609 | 96 | try: |
| paul@609 | 97 | outfile.write(infile.read()) |
| paul@609 | 98 | finally: |
| paul@609 | 99 | outfile.close() |
| paul@609 | 100 | infile.close() |
| paul@609 | 101 | |
| paul@609 | 102 | def is_newer(source, target): |
| paul@609 | 103 | |
| paul@609 | 104 | "Return whether 'source' is newer than 'target'." |
| paul@609 | 105 | |
| paul@609 | 106 | if exists(target): |
| paul@609 | 107 | target_mtime = getmtime(target) |
| paul@609 | 108 | source_mtime = getmtime(source) |
| paul@609 | 109 | return source_mtime > target_mtime |
| paul@609 | 110 | |
| paul@609 | 111 | return True |
| paul@609 | 112 | |
| paul@0 | 113 | class CommonModule: |
| paul@0 | 114 | |
| paul@0 | 115 | "A common module representation." |
| paul@0 | 116 | |
| paul@0 | 117 | def __init__(self, name, importer): |
| paul@0 | 118 | |
| paul@0 | 119 | """ |
| paul@0 | 120 | Initialise this module with the given 'name' and an 'importer' which is |
| paul@0 | 121 | used to provide access to other modules when required. |
| paul@0 | 122 | """ |
| paul@0 | 123 | |
| paul@0 | 124 | self.name = name |
| paul@0 | 125 | self.importer = importer |
| paul@0 | 126 | self.filename = None |
| paul@0 | 127 | |
| paul@0 | 128 | # Inspection-related attributes. |
| paul@0 | 129 | |
| paul@0 | 130 | self.astnode = None |
| paul@405 | 131 | self.encoding = None |
| paul@0 | 132 | self.iterators = {} |
| paul@0 | 133 | self.temp = {} |
| paul@0 | 134 | self.lambdas = {} |
| paul@0 | 135 | |
| paul@0 | 136 | # Constants, literals and values. |
| paul@0 | 137 | |
| paul@0 | 138 | self.constants = {} |
| paul@0 | 139 | self.constant_values = {} |
| paul@0 | 140 | self.literals = {} |
| paul@0 | 141 | self.literal_types = {} |
| paul@0 | 142 | |
| paul@0 | 143 | # Nested namespaces. |
| paul@0 | 144 | |
| paul@0 | 145 | self.namespace_path = [] |
| paul@0 | 146 | self.in_function = False |
| paul@0 | 147 | |
| paul@124 | 148 | # Retain the assignment value expression and track invocations. |
| paul@124 | 149 | |
| paul@124 | 150 | self.in_assignment = None |
| paul@553 | 151 | self.in_invocation = None |
| paul@124 | 152 | |
| paul@124 | 153 | # Attribute chain state management. |
| paul@0 | 154 | |
| paul@0 | 155 | self.attrs = [] |
| paul@124 | 156 | self.chain_assignment = [] |
| paul@124 | 157 | self.chain_invocation = [] |
| paul@0 | 158 | |
| paul@0 | 159 | def __repr__(self): |
| paul@0 | 160 | return "CommonModule(%r, %r)" % (self.name, self.importer) |
| paul@0 | 161 | |
| paul@0 | 162 | def parse_file(self, filename): |
| paul@0 | 163 | |
| paul@0 | 164 | "Parse the file with the given 'filename', initialising attributes." |
| paul@0 | 165 | |
| paul@0 | 166 | self.filename = filename |
| paul@405 | 167 | |
| paul@405 | 168 | # Use the Transformer directly to obtain encoding information. |
| paul@405 | 169 | |
| paul@405 | 170 | t = Transformer() |
| paul@405 | 171 | f = open(filename) |
| paul@405 | 172 | |
| paul@405 | 173 | try: |
| paul@405 | 174 | self.astnode = t.parsesuite(f.read() + "\n") |
| paul@405 | 175 | self.encoding = t.encoding |
| paul@405 | 176 | finally: |
| paul@405 | 177 | f.close() |
| paul@0 | 178 | |
| paul@0 | 179 | # Module-relative naming. |
| paul@0 | 180 | |
| paul@0 | 181 | def get_global_path(self, name): |
| paul@0 | 182 | return "%s.%s" % (self.name, name) |
| paul@0 | 183 | |
| paul@0 | 184 | def get_namespace_path(self): |
| paul@0 | 185 | return ".".join([self.name] + self.namespace_path) |
| paul@0 | 186 | |
| paul@0 | 187 | def get_object_path(self, name): |
| paul@0 | 188 | return ".".join([self.name] + self.namespace_path + [name]) |
| paul@0 | 189 | |
| paul@0 | 190 | def get_parent_path(self): |
| paul@0 | 191 | return ".".join([self.name] + self.namespace_path[:-1]) |
| paul@0 | 192 | |
| paul@0 | 193 | # Namespace management. |
| paul@0 | 194 | |
| paul@0 | 195 | def enter_namespace(self, name): |
| paul@0 | 196 | |
| paul@0 | 197 | "Enter the namespace having the given 'name'." |
| paul@0 | 198 | |
| paul@0 | 199 | self.namespace_path.append(name) |
| paul@0 | 200 | |
| paul@0 | 201 | def exit_namespace(self): |
| paul@0 | 202 | |
| paul@0 | 203 | "Exit the current namespace." |
| paul@0 | 204 | |
| paul@0 | 205 | self.namespace_path.pop() |
| paul@0 | 206 | |
| paul@0 | 207 | # Constant reference naming. |
| paul@0 | 208 | |
| paul@406 | 209 | def get_constant_name(self, value, value_type, encoding=None): |
| paul@0 | 210 | |
| paul@397 | 211 | """ |
| paul@397 | 212 | Add a new constant to the current namespace for 'value' with |
| paul@397 | 213 | 'value_type'. |
| paul@397 | 214 | """ |
| paul@0 | 215 | |
| paul@0 | 216 | path = self.get_namespace_path() |
| paul@0 | 217 | init_item(self.constants, path, dict) |
| paul@406 | 218 | return "$c%d" % add_counter_item(self.constants[path], (value, value_type, encoding)) |
| paul@0 | 219 | |
| paul@0 | 220 | # Literal reference naming. |
| paul@0 | 221 | |
| paul@0 | 222 | def get_literal_name(self): |
| paul@0 | 223 | |
| paul@0 | 224 | "Add a new literal to the current namespace." |
| paul@0 | 225 | |
| paul@0 | 226 | path = self.get_namespace_path() |
| paul@0 | 227 | init_item(self.literals, path, lambda: 0) |
| paul@0 | 228 | return "$C%d" % self.literals[path] |
| paul@0 | 229 | |
| paul@0 | 230 | def next_literal(self): |
| paul@0 | 231 | self.literals[self.get_namespace_path()] += 1 |
| paul@0 | 232 | |
| paul@0 | 233 | # Temporary iterator naming. |
| paul@0 | 234 | |
| paul@0 | 235 | def get_iterator_path(self): |
| paul@0 | 236 | return self.in_function and self.get_namespace_path() or self.name |
| paul@0 | 237 | |
| paul@0 | 238 | def get_iterator_name(self): |
| paul@0 | 239 | path = self.get_iterator_path() |
| paul@0 | 240 | init_item(self.iterators, path, lambda: 0) |
| paul@0 | 241 | return "$i%d" % self.iterators[path] |
| paul@0 | 242 | |
| paul@0 | 243 | def next_iterator(self): |
| paul@0 | 244 | self.iterators[self.get_iterator_path()] += 1 |
| paul@0 | 245 | |
| paul@0 | 246 | # Temporary variable naming. |
| paul@0 | 247 | |
| paul@0 | 248 | def get_temporary_name(self): |
| paul@0 | 249 | path = self.get_namespace_path() |
| paul@0 | 250 | init_item(self.temp, path, lambda: 0) |
| paul@0 | 251 | return "$t%d" % self.temp[path] |
| paul@0 | 252 | |
| paul@0 | 253 | def next_temporary(self): |
| paul@0 | 254 | self.temp[self.get_namespace_path()] += 1 |
| paul@0 | 255 | |
| paul@0 | 256 | # Arbitrary function naming. |
| paul@0 | 257 | |
| paul@0 | 258 | def get_lambda_name(self): |
| paul@0 | 259 | path = self.get_namespace_path() |
| paul@0 | 260 | init_item(self.lambdas, path, lambda: 0) |
| paul@0 | 261 | name = "$l%d" % self.lambdas[path] |
| paul@0 | 262 | self.lambdas[path] += 1 |
| paul@0 | 263 | return name |
| paul@0 | 264 | |
| paul@0 | 265 | def reset_lambdas(self): |
| paul@0 | 266 | self.lambdas = {} |
| paul@0 | 267 | |
| paul@0 | 268 | # Constant and literal recording. |
| paul@0 | 269 | |
| paul@537 | 270 | def get_constant_value(self, value, literals=None): |
| paul@394 | 271 | |
| paul@406 | 272 | """ |
| paul@406 | 273 | Encode the 'value' if appropriate, returning a value, a typename and any |
| paul@406 | 274 | encoding. |
| paul@406 | 275 | """ |
| paul@394 | 276 | |
| paul@394 | 277 | if isinstance(value, unicode): |
| paul@406 | 278 | return value.encode("utf-8"), "unicode", self.encoding |
| paul@405 | 279 | |
| paul@405 | 280 | # Attempt to convert plain strings to text. |
| paul@405 | 281 | |
| paul@405 | 282 | elif isinstance(value, str) and self.encoding: |
| paul@513 | 283 | try: |
| paul@537 | 284 | return get_string_details(literals, self.encoding) |
| paul@513 | 285 | except UnicodeDecodeError: |
| paul@513 | 286 | pass |
| paul@405 | 287 | |
| paul@406 | 288 | return value, value.__class__.__name__, None |
| paul@394 | 289 | |
| paul@406 | 290 | def get_constant_reference(self, ref, value, encoding=None): |
| paul@0 | 291 | |
| paul@406 | 292 | """ |
| paul@406 | 293 | Return a constant reference for the given 'ref' type and 'value', with |
| paul@406 | 294 | the optional 'encoding' applying to text values. |
| paul@406 | 295 | """ |
| paul@0 | 296 | |
| paul@406 | 297 | constant_name = self.get_constant_name(value, ref.get_origin(), encoding) |
| paul@0 | 298 | |
| paul@0 | 299 | # Return a reference for the constant. |
| paul@0 | 300 | |
| paul@0 | 301 | objpath = self.get_object_path(constant_name) |
| paul@338 | 302 | name_ref = ConstantValueRef(constant_name, ref.instance_of(objpath), value) |
| paul@0 | 303 | |
| paul@0 | 304 | # Record the value and type for the constant. |
| paul@0 | 305 | |
| paul@406 | 306 | self._reserve_constant(objpath, name_ref.value, name_ref.get_origin(), encoding) |
| paul@0 | 307 | return name_ref |
| paul@0 | 308 | |
| paul@406 | 309 | def reserve_constant(self, objpath, value, origin, encoding=None): |
| paul@251 | 310 | |
| paul@251 | 311 | """ |
| paul@251 | 312 | Reserve a constant within 'objpath' with the given 'value' and having a |
| paul@406 | 313 | type with the given 'origin', with the optional 'encoding' applying to |
| paul@406 | 314 | text values. |
| paul@251 | 315 | """ |
| paul@251 | 316 | |
| paul@397 | 317 | constant_name = self.get_constant_name(value, origin) |
| paul@251 | 318 | objpath = self.get_object_path(constant_name) |
| paul@406 | 319 | self._reserve_constant(objpath, value, origin, encoding) |
| paul@251 | 320 | |
| paul@406 | 321 | def _reserve_constant(self, objpath, value, origin, encoding): |
| paul@251 | 322 | |
| paul@406 | 323 | """ |
| paul@406 | 324 | Store a constant for 'objpath' with the given 'value' and 'origin', with |
| paul@406 | 325 | the optional 'encoding' applying to text values. |
| paul@406 | 326 | """ |
| paul@251 | 327 | |
| paul@406 | 328 | self.constant_values[objpath] = value, origin, encoding |
| paul@251 | 329 | |
| paul@0 | 330 | def get_literal_reference(self, name, ref, items, cls): |
| paul@0 | 331 | |
| paul@11 | 332 | """ |
| paul@11 | 333 | Return a literal reference for the given type 'name', literal 'ref', |
| paul@11 | 334 | node 'items' and employing the given 'cls' as the class of the returned |
| paul@11 | 335 | reference object. |
| paul@11 | 336 | """ |
| paul@11 | 337 | |
| paul@0 | 338 | # Construct an invocation using the items as arguments. |
| paul@0 | 339 | |
| paul@0 | 340 | typename = "$L%s" % name |
| paul@0 | 341 | |
| paul@0 | 342 | invocation = compiler.ast.CallFunc( |
| paul@0 | 343 | compiler.ast.Name(typename), |
| paul@0 | 344 | items |
| paul@0 | 345 | ) |
| paul@0 | 346 | |
| paul@0 | 347 | # Get a name for the actual literal. |
| paul@0 | 348 | |
| paul@0 | 349 | instname = self.get_literal_name() |
| paul@0 | 350 | self.next_literal() |
| paul@0 | 351 | |
| paul@0 | 352 | # Record the type for the literal. |
| paul@0 | 353 | |
| paul@0 | 354 | objpath = self.get_object_path(instname) |
| paul@0 | 355 | self.literal_types[objpath] = ref.get_origin() |
| paul@0 | 356 | |
| paul@0 | 357 | # Return a wrapper for the invocation exposing the items. |
| paul@0 | 358 | |
| paul@0 | 359 | return cls( |
| paul@0 | 360 | instname, |
| paul@0 | 361 | ref.instance_of(), |
| paul@0 | 362 | self.process_structure_node(invocation), |
| paul@0 | 363 | invocation.args |
| paul@0 | 364 | ) |
| paul@0 | 365 | |
| paul@0 | 366 | # Node handling. |
| paul@0 | 367 | |
| paul@0 | 368 | def process_structure(self, node): |
| paul@0 | 369 | |
| paul@0 | 370 | """ |
| paul@0 | 371 | Within the given 'node', process the program structure. |
| paul@0 | 372 | |
| paul@0 | 373 | During inspection, this will process global declarations, adjusting the |
| paul@0 | 374 | module namespace, and import statements, building a module dependency |
| paul@0 | 375 | hierarchy. |
| paul@0 | 376 | |
| paul@0 | 377 | During translation, this will consult deduced program information and |
| paul@0 | 378 | output translated code. |
| paul@0 | 379 | """ |
| paul@0 | 380 | |
| paul@0 | 381 | l = [] |
| paul@0 | 382 | for n in node.getChildNodes(): |
| paul@0 | 383 | l.append(self.process_structure_node(n)) |
| paul@0 | 384 | return l |
| paul@0 | 385 | |
| paul@0 | 386 | def process_augassign_node(self, n): |
| paul@0 | 387 | |
| paul@0 | 388 | "Process the given augmented assignment node 'n'." |
| paul@0 | 389 | |
| paul@0 | 390 | op = operator_functions[n.op] |
| paul@0 | 391 | |
| paul@0 | 392 | if isinstance(n.node, compiler.ast.Getattr): |
| paul@0 | 393 | target = compiler.ast.AssAttr(n.node.expr, n.node.attrname, "OP_ASSIGN") |
| paul@0 | 394 | elif isinstance(n.node, compiler.ast.Name): |
| paul@0 | 395 | target = compiler.ast.AssName(n.node.name, "OP_ASSIGN") |
| paul@0 | 396 | else: |
| paul@0 | 397 | target = n.node |
| paul@0 | 398 | |
| paul@0 | 399 | assignment = compiler.ast.Assign( |
| paul@0 | 400 | [target], |
| paul@0 | 401 | compiler.ast.CallFunc( |
| paul@0 | 402 | compiler.ast.Name("$op%s" % op), |
| paul@0 | 403 | [n.node, n.expr])) |
| paul@0 | 404 | |
| paul@0 | 405 | return self.process_structure_node(assignment) |
| paul@0 | 406 | |
| paul@320 | 407 | def process_assignment_for_object(self, original_name, source): |
| paul@0 | 408 | |
| paul@0 | 409 | """ |
| paul@0 | 410 | Return an assignment operation making 'original_name' refer to the given |
| paul@196 | 411 | 'source'. |
| paul@0 | 412 | """ |
| paul@0 | 413 | |
| paul@0 | 414 | assignment = compiler.ast.Assign( |
| paul@0 | 415 | [compiler.ast.AssName(original_name, "OP_ASSIGN")], |
| paul@196 | 416 | source |
| paul@0 | 417 | ) |
| paul@0 | 418 | |
| paul@0 | 419 | return self.process_structure_node(assignment) |
| paul@0 | 420 | |
| paul@0 | 421 | def process_assignment_node_items(self, n, expr): |
| paul@0 | 422 | |
| paul@0 | 423 | """ |
| paul@0 | 424 | Process the given assignment node 'n' whose children are to be assigned |
| paul@0 | 425 | items of 'expr'. |
| paul@0 | 426 | """ |
| paul@0 | 427 | |
| paul@0 | 428 | name_ref = self.process_structure_node(expr) |
| paul@0 | 429 | |
| paul@509 | 430 | # Either unpack the items and present them directly to each assignment |
| paul@509 | 431 | # node. |
| paul@509 | 432 | |
| paul@509 | 433 | if isinstance(name_ref, LiteralSequenceRef) and \ |
| paul@509 | 434 | self.process_literal_sequence_items(n, name_ref): |
| paul@0 | 435 | |
| paul@509 | 436 | pass |
| paul@509 | 437 | |
| paul@509 | 438 | # Or have the assignment nodes access each item via the sequence API. |
| paul@509 | 439 | |
| paul@509 | 440 | else: |
| paul@509 | 441 | self.process_assignment_node_items_by_position(n, expr, name_ref) |
| paul@0 | 442 | |
| paul@0 | 443 | def process_assignment_node_items_by_position(self, n, expr, name_ref): |
| paul@0 | 444 | |
| paul@0 | 445 | """ |
| paul@0 | 446 | Process the given sequence assignment node 'n', converting the node to |
| paul@0 | 447 | the separate assignment of each target using positional access on a |
| paul@0 | 448 | temporary variable representing the sequence. Use 'expr' as the assigned |
| paul@0 | 449 | value and 'name_ref' as the reference providing any existing temporary |
| paul@0 | 450 | variable. |
| paul@0 | 451 | """ |
| paul@0 | 452 | |
| paul@0 | 453 | assignments = [] |
| paul@0 | 454 | |
| paul@508 | 455 | # Employ existing names to access the sequence. |
| paul@508 | 456 | # Literal sequences do not provide names of accessible objects. |
| paul@508 | 457 | |
| paul@508 | 458 | if isinstance(name_ref, NameRef) and not isinstance(name_ref, LiteralSequenceRef): |
| paul@0 | 459 | temp = name_ref.name |
| paul@508 | 460 | |
| paul@508 | 461 | # For other expressions, create a temporary name to reference the items. |
| paul@508 | 462 | |
| paul@0 | 463 | else: |
| paul@0 | 464 | temp = self.get_temporary_name() |
| paul@0 | 465 | self.next_temporary() |
| paul@0 | 466 | |
| paul@0 | 467 | assignments.append( |
| paul@0 | 468 | compiler.ast.Assign([compiler.ast.AssName(temp, "OP_ASSIGN")], expr) |
| paul@0 | 469 | ) |
| paul@0 | 470 | |
| paul@508 | 471 | # Assign the items to the target nodes. |
| paul@508 | 472 | |
| paul@0 | 473 | for i, node in enumerate(n.nodes): |
| paul@0 | 474 | assignments.append( |
| paul@0 | 475 | compiler.ast.Assign([node], compiler.ast.Subscript( |
| paul@395 | 476 | compiler.ast.Name(temp), "OP_APPLY", [compiler.ast.Const(i, str(i))])) |
| paul@0 | 477 | ) |
| paul@0 | 478 | |
| paul@0 | 479 | return self.process_structure_node(compiler.ast.Stmt(assignments)) |
| paul@0 | 480 | |
| paul@0 | 481 | def process_literal_sequence_items(self, n, name_ref): |
| paul@0 | 482 | |
| paul@0 | 483 | """ |
| paul@0 | 484 | Process the given assignment node 'n', obtaining from the given |
| paul@0 | 485 | 'name_ref' the items to be assigned to the assignment targets. |
| paul@509 | 486 | |
| paul@509 | 487 | Return whether this method was able to process the assignment node as |
| paul@509 | 488 | a sequence of direct assignments. |
| paul@0 | 489 | """ |
| paul@0 | 490 | |
| paul@0 | 491 | if len(n.nodes) == len(name_ref.items): |
| paul@509 | 492 | assigned_names, count = get_names_from_nodes(n.nodes) |
| paul@509 | 493 | accessed_names, _count = get_names_from_nodes(name_ref.items) |
| paul@509 | 494 | |
| paul@509 | 495 | # Only assign directly between items if all assigned names are |
| paul@509 | 496 | # plain names (not attribute assignments), and if the assigned names |
| paul@509 | 497 | # do not appear in the accessed names. |
| paul@509 | 498 | |
| paul@509 | 499 | if len(assigned_names) == count and \ |
| paul@509 | 500 | not assigned_names.intersection(accessed_names): |
| paul@509 | 501 | |
| paul@509 | 502 | for node, item in zip(n.nodes, name_ref.items): |
| paul@509 | 503 | self.process_assignment_node(node, item) |
| paul@509 | 504 | |
| paul@509 | 505 | return True |
| paul@509 | 506 | |
| paul@509 | 507 | # Otherwise, use the position-based mechanism to obtain values. |
| paul@509 | 508 | |
| paul@509 | 509 | else: |
| paul@509 | 510 | return False |
| paul@0 | 511 | else: |
| paul@0 | 512 | raise InspectError("In %s, item assignment needing %d items is given %d items." % ( |
| paul@0 | 513 | self.get_namespace_path(), len(n.nodes), len(name_ref.items))) |
| paul@0 | 514 | |
| paul@0 | 515 | def process_compare_node(self, n): |
| paul@0 | 516 | |
| paul@0 | 517 | """ |
| paul@0 | 518 | Process the given comparison node 'n', converting an operator sequence |
| paul@0 | 519 | from... |
| paul@0 | 520 | |
| paul@0 | 521 | <expr1> <op1> <expr2> <op2> <expr3> |
| paul@0 | 522 | |
| paul@0 | 523 | ...to... |
| paul@0 | 524 | |
| paul@0 | 525 | <op1>(<expr1>, <expr2>) and <op2>(<expr2>, <expr3>) |
| paul@0 | 526 | """ |
| paul@0 | 527 | |
| paul@0 | 528 | invocations = [] |
| paul@0 | 529 | last = n.expr |
| paul@0 | 530 | |
| paul@0 | 531 | for op, op_node in n.ops: |
| paul@0 | 532 | op = operator_functions.get(op) |
| paul@0 | 533 | |
| paul@0 | 534 | invocations.append(compiler.ast.CallFunc( |
| paul@0 | 535 | compiler.ast.Name("$op%s" % op), |
| paul@0 | 536 | [last, op_node])) |
| paul@0 | 537 | |
| paul@0 | 538 | last = op_node |
| paul@0 | 539 | |
| paul@0 | 540 | if len(invocations) > 1: |
| paul@0 | 541 | result = compiler.ast.And(invocations) |
| paul@0 | 542 | else: |
| paul@0 | 543 | result = invocations[0] |
| paul@0 | 544 | |
| paul@0 | 545 | return self.process_structure_node(result) |
| paul@0 | 546 | |
| paul@0 | 547 | def process_dict_node(self, node): |
| paul@0 | 548 | |
| paul@0 | 549 | """ |
| paul@0 | 550 | Process the given dictionary 'node', returning a list of (key, value) |
| paul@0 | 551 | tuples. |
| paul@0 | 552 | """ |
| paul@0 | 553 | |
| paul@0 | 554 | l = [] |
| paul@0 | 555 | for key, value in node.items: |
| paul@0 | 556 | l.append(( |
| paul@0 | 557 | self.process_structure_node(key), |
| paul@0 | 558 | self.process_structure_node(value))) |
| paul@0 | 559 | return l |
| paul@0 | 560 | |
| paul@0 | 561 | def process_for_node(self, n): |
| paul@0 | 562 | |
| paul@0 | 563 | """ |
| paul@0 | 564 | Generate attribute accesses for {n.list}.__iter__ and the next method on |
| paul@0 | 565 | the iterator, producing a replacement node for the original. |
| paul@0 | 566 | """ |
| paul@0 | 567 | |
| paul@0 | 568 | node = compiler.ast.Stmt([ |
| paul@0 | 569 | |
| paul@533 | 570 | # <next> = {n.list}.__iter__().next |
| paul@0 | 571 | |
| paul@0 | 572 | compiler.ast.Assign( |
| paul@0 | 573 | [compiler.ast.AssName(self.get_iterator_name(), "OP_ASSIGN")], |
| paul@533 | 574 | compiler.ast.Getattr( |
| paul@533 | 575 | compiler.ast.CallFunc( |
| paul@533 | 576 | compiler.ast.Getattr(n.list, "__iter__"), |
| paul@533 | 577 | [] |
| paul@533 | 578 | ), "next")), |
| paul@0 | 579 | |
| paul@0 | 580 | # try: |
| paul@0 | 581 | # while True: |
| paul@533 | 582 | # <var>... = <next>() |
| paul@0 | 583 | # ... |
| paul@0 | 584 | # except StopIteration: |
| paul@0 | 585 | # pass |
| paul@0 | 586 | |
| paul@0 | 587 | compiler.ast.TryExcept( |
| paul@0 | 588 | compiler.ast.While( |
| paul@0 | 589 | compiler.ast.Name("True"), |
| paul@0 | 590 | compiler.ast.Stmt([ |
| paul@0 | 591 | compiler.ast.Assign( |
| paul@0 | 592 | [n.assign], |
| paul@0 | 593 | compiler.ast.CallFunc( |
| paul@533 | 594 | compiler.ast.Name(self.get_iterator_name()), |
| paul@0 | 595 | [] |
| paul@0 | 596 | )), |
| paul@0 | 597 | n.body]), |
| paul@0 | 598 | None), |
| paul@0 | 599 | [(compiler.ast.Name("StopIteration"), None, compiler.ast.Stmt([compiler.ast.Pass()]))], |
| paul@0 | 600 | None) |
| paul@0 | 601 | ]) |
| paul@0 | 602 | |
| paul@0 | 603 | self.next_iterator() |
| paul@0 | 604 | self.process_structure_node(node) |
| paul@0 | 605 | |
| paul@0 | 606 | def process_literal_sequence_node(self, n, name, ref, cls): |
| paul@0 | 607 | |
| paul@0 | 608 | """ |
| paul@0 | 609 | Process the given literal sequence node 'n' as a function invocation, |
| paul@0 | 610 | with 'name' indicating the type of the sequence, and 'ref' being a |
| paul@0 | 611 | reference to the type. The 'cls' is used to instantiate a suitable name |
| paul@0 | 612 | reference. |
| paul@0 | 613 | """ |
| paul@0 | 614 | |
| paul@0 | 615 | if name == "dict": |
| paul@0 | 616 | items = [] |
| paul@0 | 617 | for key, value in n.items: |
| paul@0 | 618 | items.append(compiler.ast.Tuple([key, value])) |
| paul@0 | 619 | else: # name in ("list", "tuple"): |
| paul@0 | 620 | items = n.nodes |
| paul@0 | 621 | |
| paul@0 | 622 | return self.get_literal_reference(name, ref, items, cls) |
| paul@0 | 623 | |
| paul@0 | 624 | def process_operator_node(self, n): |
| paul@0 | 625 | |
| paul@0 | 626 | """ |
| paul@0 | 627 | Process the given operator node 'n' as an operator function invocation. |
| paul@0 | 628 | """ |
| paul@0 | 629 | |
| paul@0 | 630 | op = operator_functions[n.__class__.__name__] |
| paul@0 | 631 | invocation = compiler.ast.CallFunc( |
| paul@0 | 632 | compiler.ast.Name("$op%s" % op), |
| paul@0 | 633 | list(n.getChildNodes()) |
| paul@0 | 634 | ) |
| paul@0 | 635 | return self.process_structure_node(invocation) |
| paul@0 | 636 | |
| paul@173 | 637 | def process_print_node(self, n): |
| paul@173 | 638 | |
| paul@173 | 639 | """ |
| paul@173 | 640 | Process the given print node 'n' as an invocation on a stream of the |
| paul@173 | 641 | form... |
| paul@173 | 642 | |
| paul@173 | 643 | $print(dest, args, nl) |
| paul@173 | 644 | |
| paul@173 | 645 | The special function name will be translated elsewhere. |
| paul@173 | 646 | """ |
| paul@173 | 647 | |
| paul@173 | 648 | nl = isinstance(n, compiler.ast.Printnl) |
| paul@173 | 649 | invocation = compiler.ast.CallFunc( |
| paul@173 | 650 | compiler.ast.Name("$print"), |
| paul@173 | 651 | [n.dest or compiler.ast.Name("None"), |
| paul@173 | 652 | compiler.ast.List(list(n.nodes)), |
| paul@359 | 653 | nl and compiler.ast.Name("True") or compiler.ast.Name("False")] |
| paul@173 | 654 | ) |
| paul@173 | 655 | return self.process_structure_node(invocation) |
| paul@173 | 656 | |
| paul@0 | 657 | def process_slice_node(self, n, expr=None): |
| paul@0 | 658 | |
| paul@0 | 659 | """ |
| paul@0 | 660 | Process the given slice node 'n' as an operator function invocation. |
| paul@0 | 661 | """ |
| paul@0 | 662 | |
| paul@548 | 663 | if n.flags == "OP_ASSIGN": op = "setslice" |
| paul@548 | 664 | elif n.flags == "OP_DELETE": op = "delslice" |
| paul@548 | 665 | else: op = "getslice" |
| paul@548 | 666 | |
| paul@0 | 667 | invocation = compiler.ast.CallFunc( |
| paul@0 | 668 | compiler.ast.Name("$op%s" % op), |
| paul@0 | 669 | [n.expr, n.lower or compiler.ast.Name("None"), n.upper or compiler.ast.Name("None")] + |
| paul@0 | 670 | (expr and [expr] or []) |
| paul@0 | 671 | ) |
| paul@548 | 672 | |
| paul@548 | 673 | # Fix parse tree structure. |
| paul@548 | 674 | |
| paul@548 | 675 | if op == "delslice": |
| paul@548 | 676 | invocation = compiler.ast.Discard(invocation) |
| paul@548 | 677 | |
| paul@0 | 678 | return self.process_structure_node(invocation) |
| paul@0 | 679 | |
| paul@0 | 680 | def process_sliceobj_node(self, n): |
| paul@0 | 681 | |
| paul@0 | 682 | """ |
| paul@0 | 683 | Process the given slice object node 'n' as a slice constructor. |
| paul@0 | 684 | """ |
| paul@0 | 685 | |
| paul@0 | 686 | op = "slice" |
| paul@0 | 687 | invocation = compiler.ast.CallFunc( |
| paul@0 | 688 | compiler.ast.Name("$op%s" % op), |
| paul@0 | 689 | n.nodes |
| paul@0 | 690 | ) |
| paul@0 | 691 | return self.process_structure_node(invocation) |
| paul@0 | 692 | |
| paul@0 | 693 | def process_subscript_node(self, n, expr=None): |
| paul@0 | 694 | |
| paul@0 | 695 | """ |
| paul@0 | 696 | Process the given subscript node 'n' as an operator function invocation. |
| paul@0 | 697 | """ |
| paul@0 | 698 | |
| paul@548 | 699 | if n.flags == "OP_ASSIGN": op = "setitem" |
| paul@548 | 700 | elif n.flags == "OP_DELETE": op = "delitem" |
| paul@548 | 701 | else: op = "getitem" |
| paul@548 | 702 | |
| paul@0 | 703 | invocation = compiler.ast.CallFunc( |
| paul@0 | 704 | compiler.ast.Name("$op%s" % op), |
| paul@0 | 705 | [n.expr] + list(n.subs) + (expr and [expr] or []) |
| paul@0 | 706 | ) |
| paul@548 | 707 | |
| paul@548 | 708 | # Fix parse tree structure. |
| paul@548 | 709 | |
| paul@548 | 710 | if op == "delitem": |
| paul@548 | 711 | invocation = compiler.ast.Discard(invocation) |
| paul@548 | 712 | |
| paul@0 | 713 | return self.process_structure_node(invocation) |
| paul@0 | 714 | |
| paul@0 | 715 | def process_attribute_chain(self, n): |
| paul@0 | 716 | |
| paul@0 | 717 | """ |
| paul@0 | 718 | Process the given attribute access node 'n'. Return a reference |
| paul@0 | 719 | describing the expression. |
| paul@0 | 720 | """ |
| paul@0 | 721 | |
| paul@0 | 722 | # AssAttr/Getattr are nested with the outermost access being the last |
| paul@0 | 723 | # access in any chain. |
| paul@0 | 724 | |
| paul@0 | 725 | self.attrs.insert(0, n.attrname) |
| paul@0 | 726 | attrs = self.attrs |
| paul@0 | 727 | |
| paul@0 | 728 | # Break attribute chains where non-access nodes are found. |
| paul@0 | 729 | |
| paul@0 | 730 | if not self.have_access_expression(n): |
| paul@110 | 731 | self.reset_attribute_chain() |
| paul@0 | 732 | |
| paul@0 | 733 | # Descend into the expression, extending backwards any existing chain, |
| paul@0 | 734 | # or building another for the expression. |
| paul@0 | 735 | |
| paul@0 | 736 | name_ref = self.process_structure_node(n.expr) |
| paul@0 | 737 | |
| paul@0 | 738 | # Restore chain information applying to this node. |
| paul@0 | 739 | |
| paul@110 | 740 | if not self.have_access_expression(n): |
| paul@110 | 741 | self.restore_attribute_chain(attrs) |
| paul@0 | 742 | |
| paul@0 | 743 | # Return immediately if the expression was another access and thus a |
| paul@0 | 744 | # continuation backwards along the chain. The above processing will |
| paul@0 | 745 | # have followed the chain all the way to its conclusion. |
| paul@0 | 746 | |
| paul@0 | 747 | if self.have_access_expression(n): |
| paul@0 | 748 | del self.attrs[0] |
| paul@0 | 749 | |
| paul@0 | 750 | return name_ref |
| paul@0 | 751 | |
| paul@124 | 752 | # Attribute chain handling. |
| paul@124 | 753 | |
| paul@110 | 754 | def reset_attribute_chain(self): |
| paul@110 | 755 | |
| paul@110 | 756 | "Reset the attribute chain for a subexpression of an attribute access." |
| paul@110 | 757 | |
| paul@110 | 758 | self.attrs = [] |
| paul@124 | 759 | self.chain_assignment.append(self.in_assignment) |
| paul@124 | 760 | self.chain_invocation.append(self.in_invocation) |
| paul@124 | 761 | self.in_assignment = None |
| paul@553 | 762 | self.in_invocation = None |
| paul@110 | 763 | |
| paul@110 | 764 | def restore_attribute_chain(self, attrs): |
| paul@110 | 765 | |
| paul@110 | 766 | "Restore the attribute chain for an attribute access." |
| paul@110 | 767 | |
| paul@110 | 768 | self.attrs = attrs |
| paul@124 | 769 | self.in_assignment = self.chain_assignment.pop() |
| paul@124 | 770 | self.in_invocation = self.chain_invocation.pop() |
| paul@110 | 771 | |
| paul@0 | 772 | def have_access_expression(self, node): |
| paul@0 | 773 | |
| paul@0 | 774 | "Return whether the expression associated with 'node' is Getattr." |
| paul@0 | 775 | |
| paul@0 | 776 | return isinstance(node.expr, compiler.ast.Getattr) |
| paul@0 | 777 | |
| paul@603 | 778 | def get_name_for_tracking(self, name, name_ref=None): |
| paul@0 | 779 | |
| paul@0 | 780 | """ |
| paul@0 | 781 | Return the name to be used for attribute usage observations involving |
| paul@603 | 782 | the given 'name' in the current namespace. |
| paul@603 | 783 | |
| paul@603 | 784 | If the name is being used outside a function, and if 'name_ref' is |
| paul@603 | 785 | given, a path featuring the name in the global namespace is returned |
| paul@605 | 786 | where 'name_ref' indicates a global. Otherwise, a path computed using |
| paul@603 | 787 | the current namespace and the given name is returned. |
| paul@0 | 788 | |
| paul@0 | 789 | The intention of this method is to provide a suitably-qualified name |
| paul@0 | 790 | that can be tracked across namespaces. Where globals are being |
| paul@0 | 791 | referenced in class namespaces, they should be referenced using their |
| paul@0 | 792 | path within the module, not using a path within each class. |
| paul@0 | 793 | |
| paul@0 | 794 | It may not be possible to identify a global within a function at the |
| paul@0 | 795 | time of inspection (since a global may appear later in a file). |
| paul@0 | 796 | Consequently, globals are identified by their local name rather than |
| paul@0 | 797 | their module-qualified path. |
| paul@0 | 798 | """ |
| paul@0 | 799 | |
| paul@0 | 800 | # For functions, use the appropriate local names. |
| paul@0 | 801 | |
| paul@0 | 802 | if self.in_function: |
| paul@0 | 803 | return name |
| paul@0 | 804 | |
| paul@603 | 805 | # For global names outside functions, use a global name. |
| paul@597 | 806 | |
| paul@603 | 807 | elif name_ref and name_ref.is_global_name(): |
| paul@603 | 808 | return self.get_global_path(name) |
| paul@0 | 809 | |
| paul@152 | 810 | # Otherwise, establish a name in the current namespace. |
| paul@0 | 811 | |
| paul@0 | 812 | else: |
| paul@0 | 813 | return self.get_object_path(name) |
| paul@0 | 814 | |
| paul@0 | 815 | def get_path_for_access(self): |
| paul@0 | 816 | |
| paul@0 | 817 | "Outside functions, register accesses at the module level." |
| paul@0 | 818 | |
| paul@0 | 819 | if not self.in_function: |
| paul@0 | 820 | return self.name |
| paul@0 | 821 | else: |
| paul@0 | 822 | return self.get_namespace_path() |
| paul@0 | 823 | |
| paul@0 | 824 | def get_module_name(self, node): |
| paul@0 | 825 | |
| paul@0 | 826 | """ |
| paul@0 | 827 | Using the given From 'node' in this module, calculate any relative import |
| paul@0 | 828 | information, returning a tuple containing a module to import along with any |
| paul@0 | 829 | names to import based on the node's name information. |
| paul@0 | 830 | |
| paul@0 | 831 | Where the returned module is given as None, whole module imports should |
| paul@0 | 832 | be performed for the returned modules using the returned names. |
| paul@0 | 833 | """ |
| paul@0 | 834 | |
| paul@0 | 835 | # Absolute import. |
| paul@0 | 836 | |
| paul@0 | 837 | if node.level == 0: |
| paul@0 | 838 | return node.modname, node.names |
| paul@0 | 839 | |
| paul@0 | 840 | # Relative to an ancestor of this module. |
| paul@0 | 841 | |
| paul@0 | 842 | else: |
| paul@0 | 843 | path = self.name.split(".") |
| paul@0 | 844 | level = node.level |
| paul@0 | 845 | |
| paul@0 | 846 | # Relative imports treat package roots as submodules. |
| paul@0 | 847 | |
| paul@0 | 848 | if split(self.filename)[-1] == "__init__.py": |
| paul@0 | 849 | level -= 1 |
| paul@0 | 850 | |
| paul@0 | 851 | if level > len(path): |
| paul@0 | 852 | raise InspectError("Relative import %r involves too many levels up from module %r" % ( |
| paul@0 | 853 | ("%s%s" % ("." * node.level, node.modname or "")), self.name)) |
| paul@0 | 854 | |
| paul@0 | 855 | basename = ".".join(path[:len(path)-level]) |
| paul@0 | 856 | |
| paul@0 | 857 | # Name imports from a module. |
| paul@0 | 858 | |
| paul@0 | 859 | if node.modname: |
| paul@0 | 860 | return "%s.%s" % (basename, node.modname), node.names |
| paul@0 | 861 | |
| paul@0 | 862 | # Relative whole module imports. |
| paul@0 | 863 | |
| paul@0 | 864 | else: |
| paul@0 | 865 | return basename, node.names |
| paul@0 | 866 | |
| paul@0 | 867 | def get_argnames(args): |
| paul@0 | 868 | |
| paul@0 | 869 | """ |
| paul@0 | 870 | Return a list of all names provided by 'args'. Since tuples may be |
| paul@0 | 871 | employed, the arguments are traversed depth-first. |
| paul@0 | 872 | """ |
| paul@0 | 873 | |
| paul@0 | 874 | l = [] |
| paul@0 | 875 | for arg in args: |
| paul@0 | 876 | if isinstance(arg, tuple): |
| paul@0 | 877 | l += get_argnames(arg) |
| paul@0 | 878 | else: |
| paul@0 | 879 | l.append(arg) |
| paul@0 | 880 | return l |
| paul@0 | 881 | |
| paul@509 | 882 | def get_names_from_nodes(nodes): |
| paul@509 | 883 | |
| paul@509 | 884 | """ |
| paul@509 | 885 | Return the names employed in the given 'nodes' along with the number of |
| paul@509 | 886 | nodes excluding sequences. |
| paul@509 | 887 | """ |
| paul@509 | 888 | |
| paul@509 | 889 | names = set() |
| paul@509 | 890 | count = 0 |
| paul@509 | 891 | |
| paul@509 | 892 | for node in nodes: |
| paul@509 | 893 | |
| paul@509 | 894 | # Add names and count them. |
| paul@509 | 895 | |
| paul@509 | 896 | if isinstance(node, (compiler.ast.AssName, compiler.ast.Name)): |
| paul@509 | 897 | names.add(node.name) |
| paul@509 | 898 | count += 1 |
| paul@509 | 899 | |
| paul@509 | 900 | # Add names from sequences and incorporate their counts. |
| paul@509 | 901 | |
| paul@509 | 902 | elif isinstance(node, (compiler.ast.AssList, compiler.ast.AssTuple, |
| paul@509 | 903 | compiler.ast.List, compiler.ast.Set, |
| paul@509 | 904 | compiler.ast.Tuple)): |
| paul@509 | 905 | _names, _count = get_names_from_nodes(node.nodes) |
| paul@509 | 906 | names.update(_names) |
| paul@509 | 907 | count += _count |
| paul@509 | 908 | |
| paul@509 | 909 | # Count non-name, non-sequence nodes. |
| paul@509 | 910 | |
| paul@509 | 911 | else: |
| paul@509 | 912 | count += 1 |
| paul@509 | 913 | |
| paul@509 | 914 | return names, count |
| paul@509 | 915 | |
| paul@491 | 916 | # Result classes. |
| paul@491 | 917 | |
| paul@491 | 918 | class InstructionSequence: |
| paul@491 | 919 | |
| paul@491 | 920 | "A generic sequence of instructions." |
| paul@491 | 921 | |
| paul@491 | 922 | def __init__(self, instructions): |
| paul@491 | 923 | self.instructions = instructions |
| paul@491 | 924 | |
| paul@491 | 925 | def get_value_instruction(self): |
| paul@491 | 926 | return self.instructions[-1] |
| paul@491 | 927 | |
| paul@491 | 928 | def get_init_instructions(self): |
| paul@491 | 929 | return self.instructions[:-1] |
| paul@491 | 930 | |
| paul@0 | 931 | # Dictionary utilities. |
| paul@0 | 932 | |
| paul@0 | 933 | def init_item(d, key, fn): |
| paul@0 | 934 | |
| paul@0 | 935 | """ |
| paul@0 | 936 | Add to 'd' an entry for 'key' using the callable 'fn' to make an initial |
| paul@0 | 937 | value where no entry already exists. |
| paul@0 | 938 | """ |
| paul@0 | 939 | |
| paul@0 | 940 | if not d.has_key(key): |
| paul@0 | 941 | d[key] = fn() |
| paul@0 | 942 | return d[key] |
| paul@0 | 943 | |
| paul@0 | 944 | def dict_for_keys(d, keys): |
| paul@0 | 945 | |
| paul@0 | 946 | "Return a new dictionary containing entries from 'd' for the given 'keys'." |
| paul@0 | 947 | |
| paul@0 | 948 | nd = {} |
| paul@0 | 949 | for key in keys: |
| paul@0 | 950 | if d.has_key(key): |
| paul@0 | 951 | nd[key] = d[key] |
| paul@0 | 952 | return nd |
| paul@0 | 953 | |
| paul@0 | 954 | def make_key(s): |
| paul@0 | 955 | |
| paul@0 | 956 | "Make sequence 's' into a tuple-based key, first sorting its contents." |
| paul@0 | 957 | |
| paul@0 | 958 | l = list(s) |
| paul@0 | 959 | l.sort() |
| paul@0 | 960 | return tuple(l) |
| paul@0 | 961 | |
| paul@0 | 962 | def add_counter_item(d, key): |
| paul@0 | 963 | |
| paul@0 | 964 | """ |
| paul@0 | 965 | Make a mapping in 'd' for 'key' to the number of keys added before it, thus |
| paul@0 | 966 | maintaining a mapping of keys to their order of insertion. |
| paul@0 | 967 | """ |
| paul@0 | 968 | |
| paul@0 | 969 | if not d.has_key(key): |
| paul@0 | 970 | d[key] = len(d.keys()) |
| paul@0 | 971 | return d[key] |
| paul@0 | 972 | |
| paul@0 | 973 | def remove_items(d1, d2): |
| paul@0 | 974 | |
| paul@0 | 975 | "Remove from 'd1' all items from 'd2'." |
| paul@0 | 976 | |
| paul@0 | 977 | for key in d2.keys(): |
| paul@0 | 978 | if d1.has_key(key): |
| paul@0 | 979 | del d1[key] |
| paul@0 | 980 | |
| paul@0 | 981 | # Set utilities. |
| paul@0 | 982 | |
| paul@0 | 983 | def first(s): |
| paul@0 | 984 | return list(s)[0] |
| paul@0 | 985 | |
| paul@0 | 986 | def same(s1, s2): |
| paul@0 | 987 | return set(s1) == set(s2) |
| paul@0 | 988 | |
| paul@0 | 989 | # General input/output. |
| paul@0 | 990 | |
| paul@0 | 991 | def readfile(filename): |
| paul@0 | 992 | |
| paul@0 | 993 | "Return the contents of 'filename'." |
| paul@0 | 994 | |
| paul@0 | 995 | f = open(filename) |
| paul@0 | 996 | try: |
| paul@0 | 997 | return f.read() |
| paul@0 | 998 | finally: |
| paul@0 | 999 | f.close() |
| paul@0 | 1000 | |
| paul@0 | 1001 | def writefile(filename, s): |
| paul@0 | 1002 | |
| paul@0 | 1003 | "Write to 'filename' the string 's'." |
| paul@0 | 1004 | |
| paul@0 | 1005 | f = open(filename, "w") |
| paul@0 | 1006 | try: |
| paul@0 | 1007 | f.write(s) |
| paul@0 | 1008 | finally: |
| paul@0 | 1009 | f.close() |
| paul@0 | 1010 | |
| paul@0 | 1011 | # General encoding. |
| paul@0 | 1012 | |
| paul@0 | 1013 | def sorted_output(x): |
| paul@0 | 1014 | |
| paul@0 | 1015 | "Sort sequence 'x' and return a string with commas separating the values." |
| paul@0 | 1016 | |
| paul@0 | 1017 | x = map(str, x) |
| paul@0 | 1018 | x.sort() |
| paul@0 | 1019 | return ", ".join(x) |
| paul@0 | 1020 | |
| paul@537 | 1021 | def get_string_details(literals, encoding): |
| paul@512 | 1022 | |
| paul@512 | 1023 | """ |
| paul@537 | 1024 | Determine whether 'literals' represent Unicode strings or byte strings, |
| paul@537 | 1025 | using 'encoding' to reproduce byte sequences. |
| paul@537 | 1026 | |
| paul@537 | 1027 | Each literal is the full program representation including prefix and quotes |
| paul@537 | 1028 | recoded by the parser to UTF-8. Thus, any literal found to represent a byte |
| paul@537 | 1029 | string needs to be translated back to its original encoding. |
| paul@537 | 1030 | |
| paul@537 | 1031 | Return a single encoded literal value, a type name, and the original |
| paul@537 | 1032 | encoding as a tuple. |
| paul@537 | 1033 | """ |
| paul@537 | 1034 | |
| paul@537 | 1035 | typename = "unicode" |
| paul@537 | 1036 | |
| paul@537 | 1037 | l = [] |
| paul@537 | 1038 | |
| paul@537 | 1039 | for s in literals: |
| paul@537 | 1040 | out, _typename = get_literal_details(s) |
| paul@537 | 1041 | if _typename == "str": |
| paul@537 | 1042 | typename = "str" |
| paul@537 | 1043 | l.append(out) |
| paul@537 | 1044 | |
| paul@537 | 1045 | out = "".join(l) |
| paul@537 | 1046 | |
| paul@537 | 1047 | # For Unicode values, convert to the UTF-8 program representation. |
| paul@537 | 1048 | |
| paul@537 | 1049 | if typename == "unicode": |
| paul@537 | 1050 | return out.encode("utf-8"), typename, encoding |
| paul@537 | 1051 | |
| paul@537 | 1052 | # For byte string values, convert back to the original encoding. |
| paul@537 | 1053 | |
| paul@537 | 1054 | else: |
| paul@537 | 1055 | return out.encode(encoding), typename, encoding |
| paul@537 | 1056 | |
| paul@537 | 1057 | def get_literal_details(s): |
| paul@537 | 1058 | |
| paul@537 | 1059 | """ |
| paul@537 | 1060 | Determine whether 's' represents a Unicode string or a byte string, where |
| paul@537 | 1061 | 's' contains the full program representation of a literal including prefix |
| paul@537 | 1062 | and quotes, recoded by the parser to UTF-8. |
| paul@512 | 1063 | |
| paul@512 | 1064 | Find and convert Unicode values starting with <backslash>u or <backslash>U, |
| paul@512 | 1065 | and byte or Unicode values starting with <backslash><octal digit> or |
| paul@512 | 1066 | <backslash>x. |
| paul@512 | 1067 | |
| paul@512 | 1068 | Literals prefixed with "u" cause <backslash><octal digit> and <backslash>x |
| paul@512 | 1069 | to be considered as Unicode values. Otherwise, they produce byte values and |
| paul@512 | 1070 | cause unprefixed strings to be considered as byte strings. |
| paul@512 | 1071 | |
| paul@512 | 1072 | Literals prefixed with "r" do not have their backslash-encoded values |
| paul@512 | 1073 | converted unless also prefixed with "u", in which case only the above value |
| paul@512 | 1074 | formats are converted, not any of the other special sequences for things |
| paul@512 | 1075 | like newlines. |
| paul@512 | 1076 | |
| paul@537 | 1077 | Return the literal value as a Unicode object together with the appropriate |
| paul@537 | 1078 | type name in a tuple. |
| paul@512 | 1079 | """ |
| paul@512 | 1080 | |
| paul@512 | 1081 | l = [] |
| paul@512 | 1082 | |
| paul@512 | 1083 | # Identify the quote character and use it to identify the prefix. |
| paul@512 | 1084 | |
| paul@512 | 1085 | quote_type = s[-1] |
| paul@512 | 1086 | prefix_end = s.find(quote_type) |
| paul@512 | 1087 | prefix = s[:prefix_end].lower() |
| paul@512 | 1088 | |
| paul@512 | 1089 | if prefix not in ("", "b", "br", "r", "u", "ur"): |
| paul@512 | 1090 | raise ValueError, "String literal does not have a supported prefix: %s" % s |
| paul@512 | 1091 | |
| paul@513 | 1092 | if "b" in prefix: |
| paul@513 | 1093 | typename = "str" |
| paul@513 | 1094 | else: |
| paul@513 | 1095 | typename = "unicode" |
| paul@513 | 1096 | |
| paul@512 | 1097 | # Identify triple quotes or single quotes. |
| paul@512 | 1098 | |
| paul@512 | 1099 | if len(s) >= 6 and s[-2] == quote_type and s[-3] == quote_type: |
| paul@512 | 1100 | quote = s[prefix_end:prefix_end+3] |
| paul@512 | 1101 | current = prefix_end + 3 |
| paul@512 | 1102 | end = len(s) - 3 |
| paul@512 | 1103 | else: |
| paul@512 | 1104 | quote = s[prefix_end] |
| paul@512 | 1105 | current = prefix_end + 1 |
| paul@512 | 1106 | end = len(s) - 1 |
| paul@512 | 1107 | |
| paul@512 | 1108 | # Conversions of some quoted values. |
| paul@512 | 1109 | |
| paul@512 | 1110 | searches = { |
| paul@512 | 1111 | "u" : (6, 16), |
| paul@512 | 1112 | "U" : (10, 16), |
| paul@512 | 1113 | "x" : (4, 16), |
| paul@512 | 1114 | } |
| paul@512 | 1115 | |
| paul@512 | 1116 | octal_digits = map(str, range(0, 8)) |
| paul@512 | 1117 | |
| paul@512 | 1118 | # Translations of some quoted values. |
| paul@512 | 1119 | |
| paul@512 | 1120 | escaped = { |
| paul@512 | 1121 | "\\" : "\\", "'" : "'", '"' : '"', |
| paul@512 | 1122 | "a" : "\a", "b" : "\b", "f" : "\f", |
| paul@512 | 1123 | "n" : "\n", "r" : "\r", "t" : "\t", |
| paul@512 | 1124 | } |
| paul@512 | 1125 | |
| paul@512 | 1126 | while current < end: |
| paul@512 | 1127 | |
| paul@512 | 1128 | # Look for quoted values. |
| paul@512 | 1129 | |
| paul@512 | 1130 | index = s.find("\\", current) |
| paul@512 | 1131 | if index == -1 or index + 1 == end: |
| paul@512 | 1132 | l.append(s[current:end]) |
| paul@512 | 1133 | break |
| paul@512 | 1134 | |
| paul@512 | 1135 | # Add the preceding text. |
| paul@512 | 1136 | |
| paul@512 | 1137 | l.append(s[current:index]) |
| paul@512 | 1138 | |
| paul@512 | 1139 | # Handle quoted text. |
| paul@512 | 1140 | |
| paul@512 | 1141 | term = s[index+1] |
| paul@512 | 1142 | |
| paul@512 | 1143 | # Add Unicode values. Where a string is u-prefixed, even \o and \x |
| paul@512 | 1144 | # produce Unicode values. |
| paul@512 | 1145 | |
| paul@513 | 1146 | if typename == "unicode" and ( |
| paul@513 | 1147 | term in ("u", "U") or |
| paul@513 | 1148 | "u" in prefix and (term == "x" or term in octal_digits)): |
| paul@512 | 1149 | |
| paul@512 | 1150 | needed, base = searches.get(term, (4, 8)) |
| paul@512 | 1151 | value = convert_quoted_value(s, index, needed, end, base, unichr) |
| paul@512 | 1152 | l.append(value) |
| paul@512 | 1153 | current = index + needed |
| paul@512 | 1154 | |
| paul@512 | 1155 | # Add raw byte values, changing the string type. |
| paul@512 | 1156 | |
| paul@512 | 1157 | elif "r" not in prefix and ( |
| paul@512 | 1158 | term == "x" or term in octal_digits): |
| paul@512 | 1159 | |
| paul@512 | 1160 | needed, base = searches.get(term, (4, 8)) |
| paul@512 | 1161 | value = convert_quoted_value(s, index, needed, end, base, chr) |
| paul@512 | 1162 | l.append(value) |
| paul@512 | 1163 | typename = "str" |
| paul@512 | 1164 | current = index + needed |
| paul@512 | 1165 | |
| paul@512 | 1166 | # Add other escaped values. |
| paul@512 | 1167 | |
| paul@512 | 1168 | elif "r" not in prefix and escaped.has_key(term): |
| paul@512 | 1169 | l.append(escaped[term]) |
| paul@512 | 1170 | current = index + 2 |
| paul@512 | 1171 | |
| paul@512 | 1172 | # Add other text as found. |
| paul@512 | 1173 | |
| paul@512 | 1174 | else: |
| paul@512 | 1175 | l.append(s[index:index+2]) |
| paul@512 | 1176 | current = index + 2 |
| paul@512 | 1177 | |
| paul@537 | 1178 | # Collect the components into a single Unicode object. Since the literal |
| paul@537 | 1179 | # text was already in UTF-8 form, interpret plain strings as UTF-8 |
| paul@537 | 1180 | # sequences. |
| paul@512 | 1181 | |
| paul@537 | 1182 | out = [] |
| paul@512 | 1183 | |
| paul@537 | 1184 | for value in l: |
| paul@537 | 1185 | if isinstance(value, unicode): |
| paul@537 | 1186 | out.append(value) |
| paul@537 | 1187 | else: |
| paul@537 | 1188 | out.append(unicode(value, "utf-8")) |
| paul@512 | 1189 | |
| paul@537 | 1190 | return "".join(out), typename |
| paul@512 | 1191 | |
| paul@512 | 1192 | def convert_quoted_value(s, index, needed, end, base, fn): |
| paul@512 | 1193 | |
| paul@512 | 1194 | """ |
| paul@512 | 1195 | Interpret a quoted value in 's' at 'index' with the given 'needed' number of |
| paul@512 | 1196 | positions, and with the given 'end' indicating the first position after the |
| paul@512 | 1197 | end of the actual string content. |
| paul@512 | 1198 | |
| paul@512 | 1199 | Use 'base' as the numerical base when interpreting the value, and use 'fn' |
| paul@512 | 1200 | to convert the value to an appropriate type. |
| paul@512 | 1201 | """ |
| paul@512 | 1202 | |
| paul@512 | 1203 | s = s[index:min(index+needed, end)] |
| paul@512 | 1204 | |
| paul@512 | 1205 | # Not a complete occurrence. |
| paul@512 | 1206 | |
| paul@512 | 1207 | if len(s) < needed: |
| paul@512 | 1208 | return s |
| paul@512 | 1209 | |
| paul@512 | 1210 | # Test for a well-formed value. |
| paul@512 | 1211 | |
| paul@512 | 1212 | try: |
| paul@512 | 1213 | first = base == 8 and 1 or 2 |
| paul@512 | 1214 | value = int(s[first:needed], base) |
| paul@512 | 1215 | except ValueError: |
| paul@512 | 1216 | return s |
| paul@512 | 1217 | else: |
| paul@512 | 1218 | return fn(value) |
| paul@512 | 1219 | |
| paul@0 | 1220 | # Attribute chain decoding. |
| paul@0 | 1221 | |
| paul@0 | 1222 | def get_attrnames(attrnames): |
| paul@11 | 1223 | |
| paul@11 | 1224 | """ |
| paul@11 | 1225 | Split the qualified attribute chain 'attrnames' into its components, |
| paul@11 | 1226 | handling special attributes starting with "#" that indicate type |
| paul@11 | 1227 | conformance. |
| paul@11 | 1228 | """ |
| paul@11 | 1229 | |
| paul@0 | 1230 | if attrnames.startswith("#"): |
| paul@0 | 1231 | return [attrnames] |
| paul@0 | 1232 | else: |
| paul@0 | 1233 | return attrnames.split(".") |
| paul@0 | 1234 | |
| paul@0 | 1235 | def get_attrname_from_location(location): |
| paul@11 | 1236 | |
| paul@11 | 1237 | """ |
| paul@11 | 1238 | Extract the first attribute from the attribute names employed in a |
| paul@11 | 1239 | 'location'. |
| paul@11 | 1240 | """ |
| paul@11 | 1241 | |
| paul@0 | 1242 | path, name, attrnames, access = location |
| paul@91 | 1243 | if not attrnames: |
| paul@91 | 1244 | return attrnames |
| paul@0 | 1245 | return get_attrnames(attrnames)[0] |
| paul@0 | 1246 | |
| paul@85 | 1247 | def get_name_path(path, name): |
| paul@85 | 1248 | |
| paul@85 | 1249 | "Return a suitable qualified name from the given 'path' and 'name'." |
| paul@85 | 1250 | |
| paul@85 | 1251 | if "." in name: |
| paul@85 | 1252 | return name |
| paul@85 | 1253 | else: |
| paul@85 | 1254 | return "%s.%s" % (path, name) |
| paul@85 | 1255 | |
| paul@90 | 1256 | # Usage-related functions. |
| paul@89 | 1257 | |
| paul@89 | 1258 | def get_types_for_usage(attrnames, objects): |
| paul@89 | 1259 | |
| paul@89 | 1260 | """ |
| paul@89 | 1261 | Identify the types that can support the given 'attrnames', using the |
| paul@89 | 1262 | given 'objects' as the catalogue of type details. |
| paul@89 | 1263 | """ |
| paul@89 | 1264 | |
| paul@89 | 1265 | types = [] |
| paul@89 | 1266 | for name, _attrnames in objects.items(): |
| paul@89 | 1267 | if set(attrnames).issubset(_attrnames): |
| paul@89 | 1268 | types.append(name) |
| paul@89 | 1269 | return types |
| paul@89 | 1270 | |
| paul@90 | 1271 | def get_invoked_attributes(usage): |
| paul@90 | 1272 | |
| paul@90 | 1273 | "Obtain invoked attribute from the given 'usage'." |
| paul@90 | 1274 | |
| paul@90 | 1275 | invoked = [] |
| paul@90 | 1276 | if usage: |
| paul@107 | 1277 | for attrname, invocation, assignment in usage: |
| paul@90 | 1278 | if invocation: |
| paul@90 | 1279 | invoked.append(attrname) |
| paul@90 | 1280 | return invoked |
| paul@90 | 1281 | |
| paul@107 | 1282 | def get_assigned_attributes(usage): |
| paul@107 | 1283 | |
| paul@107 | 1284 | "Obtain assigned attribute from the given 'usage'." |
| paul@107 | 1285 | |
| paul@107 | 1286 | assigned = [] |
| paul@107 | 1287 | if usage: |
| paul@107 | 1288 | for attrname, invocation, assignment in usage: |
| paul@107 | 1289 | if assignment: |
| paul@107 | 1290 | assigned.append(attrname) |
| paul@107 | 1291 | return assigned |
| paul@107 | 1292 | |
| paul@366 | 1293 | # Type and module functions. |
| paul@538 | 1294 | # NOTE: This makes assumptions about the __builtins__ structure. |
| paul@366 | 1295 | |
| paul@366 | 1296 | def get_builtin_module(name): |
| paul@366 | 1297 | |
| paul@366 | 1298 | "Return the module name containing the given type 'name'." |
| paul@366 | 1299 | |
| paul@394 | 1300 | if name == "string": |
| paul@538 | 1301 | modname = "str" |
| paul@394 | 1302 | elif name == "utf8string": |
| paul@538 | 1303 | modname = "unicode" |
| paul@394 | 1304 | elif name == "NoneType": |
| paul@538 | 1305 | modname = "none" |
| paul@394 | 1306 | else: |
| paul@538 | 1307 | modname = name |
| paul@538 | 1308 | |
| paul@538 | 1309 | return "__builtins__.%s" % modname |
| paul@366 | 1310 | |
| paul@366 | 1311 | def get_builtin_type(name): |
| paul@366 | 1312 | |
| paul@366 | 1313 | "Return the type name provided by the given Python value 'name'." |
| paul@366 | 1314 | |
| paul@394 | 1315 | if name == "str": |
| paul@394 | 1316 | return "string" |
| paul@394 | 1317 | elif name == "unicode": |
| paul@394 | 1318 | return "utf8string" |
| paul@394 | 1319 | else: |
| paul@394 | 1320 | return name |
| paul@366 | 1321 | |
| paul@538 | 1322 | def get_builtin_class(name): |
| paul@538 | 1323 | |
| paul@538 | 1324 | "Return the full name of the built-in class having the given 'name'." |
| paul@538 | 1325 | |
| paul@538 | 1326 | typename = get_builtin_type(name) |
| paul@538 | 1327 | module = get_builtin_module(typename) |
| paul@538 | 1328 | return "%s.%s" % (module, typename) |
| paul@538 | 1329 | |
| paul@0 | 1330 | # Useful data. |
| paul@0 | 1331 | |
| paul@11 | 1332 | predefined_constants = "False", "None", "NotImplemented", "True" |
| paul@0 | 1333 | |
| paul@0 | 1334 | operator_functions = { |
| paul@0 | 1335 | |
| paul@0 | 1336 | # Fundamental operations. |
| paul@0 | 1337 | |
| paul@0 | 1338 | "is" : "is_", |
| paul@0 | 1339 | "is not" : "is_not", |
| paul@0 | 1340 | |
| paul@0 | 1341 | # Binary operations. |
| paul@0 | 1342 | |
| paul@0 | 1343 | "in" : "in_", |
| paul@0 | 1344 | "not in" : "not_in", |
| paul@0 | 1345 | "Add" : "add", |
| paul@0 | 1346 | "Bitand" : "and_", |
| paul@0 | 1347 | "Bitor" : "or_", |
| paul@0 | 1348 | "Bitxor" : "xor", |
| paul@0 | 1349 | "Div" : "div", |
| paul@0 | 1350 | "FloorDiv" : "floordiv", |
| paul@0 | 1351 | "LeftShift" : "lshift", |
| paul@0 | 1352 | "Mod" : "mod", |
| paul@0 | 1353 | "Mul" : "mul", |
| paul@0 | 1354 | "Power" : "pow", |
| paul@0 | 1355 | "RightShift" : "rshift", |
| paul@0 | 1356 | "Sub" : "sub", |
| paul@0 | 1357 | |
| paul@0 | 1358 | # Unary operations. |
| paul@0 | 1359 | |
| paul@0 | 1360 | "Invert" : "invert", |
| paul@0 | 1361 | "UnaryAdd" : "pos", |
| paul@0 | 1362 | "UnarySub" : "neg", |
| paul@0 | 1363 | |
| paul@0 | 1364 | # Augmented assignment. |
| paul@0 | 1365 | |
| paul@0 | 1366 | "+=" : "iadd", |
| paul@0 | 1367 | "-=" : "isub", |
| paul@0 | 1368 | "*=" : "imul", |
| paul@0 | 1369 | "/=" : "idiv", |
| paul@0 | 1370 | "//=" : "ifloordiv", |
| paul@0 | 1371 | "%=" : "imod", |
| paul@0 | 1372 | "**=" : "ipow", |
| paul@0 | 1373 | "<<=" : "ilshift", |
| paul@0 | 1374 | ">>=" : "irshift", |
| paul@0 | 1375 | "&=" : "iand", |
| paul@0 | 1376 | "^=" : "ixor", |
| paul@0 | 1377 | "|=" : "ior", |
| paul@0 | 1378 | |
| paul@0 | 1379 | # Comparisons. |
| paul@0 | 1380 | |
| paul@0 | 1381 | "==" : "eq", |
| paul@0 | 1382 | "!=" : "ne", |
| paul@0 | 1383 | "<" : "lt", |
| paul@0 | 1384 | "<=" : "le", |
| paul@0 | 1385 | ">=" : "ge", |
| paul@0 | 1386 | ">" : "gt", |
| paul@0 | 1387 | } |
| paul@0 | 1388 | |
| paul@0 | 1389 | # vim: tabstop=4 expandtab shiftwidth=4 |
