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GeezerVison is showing github.com — cpython/Lib/doctest.py at main · python/cpython Expand file tree/ Copy pathdoctest.pyMore file actions 3019 lines (2543 loc) · 111 KB / Copy pathdoctest.pyFile metadata and controls3019 lines (2543 loc) · 111 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 # Module doctest. # Released to the public domain 16-Jan-2001, by Tim Peters ([email protected]). # Major enhancements and refactoring by: # Jim Fulton # Edward Loper # Provided as-is; use at your own risk; no warranty; no promises; enjoy! r"""Module doctest -- a framework for running examples in docstrings. In simplest use, end each module M to be tested with: def _test(): import doctest doctest.testmod() if __name__ == "__main__": _test() Then running the module as a script will cause the examples in the docstrings to get executed and verified: python M.py This won't display anything unless an example fails, in which case the failing example(s) and the cause(s) of the failure(s) are printed to stdout (why not stderr? because stderr is a lame hack <0.2 wink>), and the final line of output is "Test failed.". Run it with the -v switch instead: python M.py -v and a detailed report of all examples tried is printed to stdout, along with assorted summaries at the end. You can force verbose mode by passing "verbose=True" to testmod, or prohibit it by passing "verbose=False". In either of those cases, sys.argv is not examined by testmod. There are a variety of other ways to run doctests, including integration with the unittest framework, and support for running non-Python text files containing doctests. There are also many ways to override parts of doctest's default behaviors. See the Library Reference Manual for details. """ __docformat__ = 'reStructuredText en' __all__ = [ # 0, Option Flags 'register_optionflag', 'DONT_ACCEPT_TRUE_FOR_1', 'DONT_ACCEPT_BLANKLINE', 'NORMALIZE_WHITESPACE', 'ELLIPSIS', 'SKIP', 'IGNORE_EXCEPTION_DETAIL', 'COMPARISON_FLAGS', 'REPORT_UDIFF', 'REPORT_CDIFF', 'REPORT_NDIFF', 'REPORT_ONLY_FIRST_FAILURE', 'REPORTING_FLAGS', 'FAIL_FAST', # 1. Utility Functions # 2. Example & DocTest 'Example', 'DocTest', # 3. Doctest Parser 'DocTestParser', # 4. Doctest Finder 'DocTestFinder', # 5. Doctest Runner 'DocTestRunner', 'OutputChecker', 'DocTestFailure', 'UnexpectedException', 'DebugRunner', # 6. Test Functions 'testmod', 'testfile', 'run_docstring_examples', # 7. Unittest Support 'DocTestSuite', 'DocFileSuite', 'set_unittest_reportflags', # 8. Debugging Support 'script_from_examples', 'testsource', 'debug_src', 'debug', ] import __future__ import difflib import functools import inspect import linecache import os import pdb import re import sys import traceback import types import unittest from io import StringIO, TextIOWrapper, BytesIO from collections import namedtuple lazy import _colorize # Used in doctests lazy from _colorize import ANSIColors, can_colorize class TestResults(namedtuple('TestResults', 'failed attempted')): def __new__(cls, failed, attempted, *, skipped=0): results = super().__new__(cls, failed, attempted) results.skipped = skipped return results def __repr__(self): if self.skipped: return (f'TestResults(failed={self.failed}, ' f'attempted={self.attempted}, ' f'skipped={self.skipped})') else: # Leave the repr() unchanged for backward compatibility # if skipped is zero return super().__repr__() # There are 4 basic classes: # - Example: a <source, want> pair, plus an intra-docstring line number. # - DocTest: a collection of examples, parsed from a docstring, plus # info about where the docstring came from (name, filename, lineno). # - DocTestFinder: extracts DocTests from a given object's docstring and # its contained objects' docstrings. # - DocTestRunner: runs DocTest cases, and accumulates statistics. # # So the basic picture is: # # list of: # +------+ +---------+ +-------+ # |object| --DocTestFinder-> | DocTest | --DocTestRunner-> |results| # +------+ +---------+ +-------+ # | Example | # | ... | # | Example | # +---------+ # Option constants. OPTIONFLAGS_BY_NAME = {} def register_optionflag(name): # Create a new flag unless `name` is already known. return OPTIONFLAGS_BY_NAME.setdefault(name, 1 << len(OPTIONFLAGS_BY_NAME)) DONT_ACCEPT_TRUE_FOR_1 = register_optionflag('DONT_ACCEPT_TRUE_FOR_1') DONT_ACCEPT_BLANKLINE = register_optionflag('DONT_ACCEPT_BLANKLINE') NORMALIZE_WHITESPACE = register_optionflag('NORMALIZE_WHITESPACE') ELLIPSIS = register_optionflag('ELLIPSIS') SKIP = register_optionflag('SKIP') IGNORE_EXCEPTION_DETAIL = register_optionflag('IGNORE_EXCEPTION_DETAIL') COMPARISON_FLAGS = (DONT_ACCEPT_TRUE_FOR_1 | DONT_ACCEPT_BLANKLINE | NORMALIZE_WHITESPACE | ELLIPSIS | SKIP | IGNORE_EXCEPTION_DETAIL) REPORT_UDIFF = register_optionflag('REPORT_UDIFF') REPORT_CDIFF = register_optionflag('REPORT_CDIFF') REPORT_NDIFF = register_optionflag('REPORT_NDIFF') REPORT_ONLY_FIRST_FAILURE = register_optionflag('REPORT_ONLY_FIRST_FAILURE') FAIL_FAST = register_optionflag('FAIL_FAST') REPORTING_FLAGS = (REPORT_UDIFF | REPORT_CDIFF | REPORT_NDIFF | REPORT_ONLY_FIRST_FAILURE | FAIL_FAST) # Special string markers for use in `want` strings: BLANKLINE_MARKER = '<BLANKLINE>' ELLIPSIS_MARKER = '...' ###################################################################### ## Table of Contents ###################################################################### # 1. Utility Functions # 2. Example & DocTest -- store test cases # 3. DocTest Parser -- extracts examples from strings # 4. DocTest Finder -- extracts test cases from objects # 5. DocTest Runner -- runs test cases # 6. Test Functions -- convenient wrappers for testing # 7. Unittest Support # 8. Debugging Support # 9. Example Usage ###################################################################### ## 1. Utility Functions ###################################################################### def _extract_future_flags(globs): """ Return the compiler-flags associated with the future features that have been imported into the given namespace (globs). """ flags = 0 for fname in __future__.all_feature_names: feature = globs.get(fname, None) if feature is getattr(__future__, fname): flags |= feature.compiler_flag return flags def _normalize_module(module, depth=2): """ Return the module specified by `module`. In particular: - If `module` is a module, then return module. - If `module` is a string, then import and return the module with that name. - If `module` is None, then return the calling module. The calling module is assumed to be the module of the stack frame at the given depth in the call stack. """ if inspect.ismodule(module): return module elif isinstance(module, str): return __import__(module, globals(), locals(), ["*"]) elif module is None: try: try: return sys.modules[sys._getframemodulename(depth)] except AttributeError: return sys.modules[sys._getframe(depth).f_globals['__name__']] except KeyError: pass else: raise TypeError("Expected a module, string, or None") def _load_testfile(filename, package, module_relative, encoding): if module_relative: package = _normalize_module(package, 3) filename = _module_relative_path(package, filename) if (loader := getattr(package, '__loader__', None)) is None: try: loader = package.__spec__.loader except AttributeError: pass if hasattr(loader, 'get_data'): file_contents = loader.get_data(filename) # get_data() opens files as 'rb', so one must do the equivalent # conversion as universal newlines would do. return TextIOWrapper(BytesIO(file_contents), encoding=encoding, newline=None).read(), filename with open(filename, encoding=encoding) as f: return f.read(), filename def _indent(s, indent=4): """ Add the given number of space characters to the beginning of every non-blank line in `s`, and return the result. """ # This regexp matches the start of non-blank lines: return re.sub('(?m)^(?!$)', indent*' ', s) def _exception_traceback(exc_info): """ Return a string containing a traceback message for the given exc_info tuple (as returned by sys.exc_info()). """ # Get a traceback message. excout = StringIO() exc_type, exc_val, exc_tb = exc_info traceback.print_exception(exc_type, exc_val, exc_tb, file=excout) return excout.getvalue() # Override some StringIO methods. class _SpoofOut(StringIO): def getvalue(self): result = StringIO.getvalue(self) # If anything at all was written, make sure there's a trailing # newline. There's no way for the expected output to indicate # that a trailing newline is missing. if result and not result.endswith("\n"): result += "\n" return result def truncate(self, size=None): if size is not None: self.seek(size) StringIO.truncate(self) # Worst-case linear-time ellipsis matching. def _ellipsis_match(want, got): """ Essentially the only subtle case: >>> _ellipsis_match('aa...aa', 'aaa') False """ if ELLIPSIS_MARKER not in want: return want == got # Find "the real" strings. ws = want.split(ELLIPSIS_MARKER) assert len(ws) >= 2 # Deal with exact matches possibly needed at one or both ends. startpos, endpos = 0, len(got) w = ws[0] if w: # starts with exact match if got.startswith(w): startpos = len(w) del ws[0] else: return False w = ws[-1] if w: # ends with exact match if got.endswith(w): endpos -= len(w) del ws[-1] else: return False if startpos > endpos: # Exact end matches required more characters than we have, as in # _ellipsis_match('aa...aa', 'aaa') return False # For the rest, we only need to find the leftmost non-overlapping # match for each piece. If there's no overall match that way alone, # there's no overall match period. for w in ws: # w may be '' at times, if there are consecutive ellipses, or # due to an ellipsis at the start or end of `want`. That's OK. # Search for an empty string succeeds, and doesn't change startpos. startpos = got.find(w, startpos, endpos) if startpos < 0: return False startpos += len(w) return True def _comment_line(line): "Return a commented form of the given line" line = line.rstrip() if line: return '# '+line else: return '#' def _strip_exception_details(msg): # Support for IGNORE_EXCEPTION_DETAIL. # Get rid of everything except the exception name; in particular, drop # the possibly dotted module path (if any) and the exception message (if # any). We assume that a colon is never part of a dotted name, or of an # exception name. # E.g., given # "foo.bar.MyError: la di da" # return "MyError" # Or for "abc.def" or "abc.def:\n" return "def". start, end = 0, len(msg) # The exception name must appear on the first line. i = msg.find("\n") if i >= 0: end = i # retain up to the first colon (if any) i = msg.find(':', 0, end) if i >= 0: end = i # retain just the exception name i = msg.rfind('.', 0, end) if i >= 0: start = i+1 return msg[start: end] class _OutputRedirectingPdb(pdb.Pdb): """ A specialized version of the python debugger that redirects stdout to a given stream when interacting with the user. Stdout is *not* redirected when traced code is executed. """ def __init__(self, out): self.__out = out self.__debugger_used = False # do not play signal games in the pdb super().__init__(stdout=out, nosigint=True) # still use input() to get user input self.use_rawinput = 1 def set_trace(self, frame=None, *, commands=None): self.__debugger_used = True if frame is None: frame = sys._getframe().f_back pdb.Pdb.set_trace(self, frame, commands=commands) def set_continue(self): # Calling set_continue unconditionally would break unit test # coverage reporting, as Bdb.set_continue calls sys.settrace(None). if self.__debugger_used: pdb.Pdb.set_continue(self) def trace_dispatch(self, *args): # Redirect stdout to the given stream. save_stdout = sys.stdout sys.stdout = self.__out # Call Pdb's trace dispatch method. try: return pdb.Pdb.trace_dispatch(self, *args) finally: sys.stdout = save_stdout # [XX] Normalize with respect to os.path.pardir? def _module_relative_path(module, test_path): if not inspect.ismodule(module): raise TypeError('Expected a module: %r' % module) if test_path.startswith('/'): raise ValueError('Module-relative files may not have absolute paths') # Normalize the path. On Windows, replace "/" with "\". test_path = os.path.join(*(test_path.split('/'))) # Find the base directory for the path. if hasattr(module, '__file__'): # A normal module/package basedir = os.path.split(module.__file__)[0] elif module.__name__ == '__main__': # An interactive session. if len(sys.argv)>0 and sys.argv[0] != '': basedir = os.path.split(sys.argv[0])[0] else: basedir = os.curdir else: if hasattr(module, '__path__'): for directory in module.__path__: fullpath = os.path.join(directory, test_path) if os.path.exists(fullpath): return fullpath # A module w/o __file__ (this includes builtins) raise ValueError("Can't resolve paths relative to the module " "%r (it has no __file__)" % module.__name__) # Combine the base directory and the test path. return os.path.join(basedir, test_path) ###################################################################### ## 2. Example & DocTest ###################################################################### ## - An "example" is a <source, want> pair, where "source" is a ## fragment of source code, and "want" is the expected output for ## "source." The Example class also includes information about ## where the example was extracted from. ## ## - A "doctest" is a collection of examples, typically extracted from ## a string (such as an object's docstring). The DocTest class also ## includes information about where the string was extracted from. class Example: """ A single doctest example, consisting of source code and expected output. `Example` defines the following attributes: - source: A single Python statement, always ending with a newline. The constructor adds a newline if needed. - want: The expected output from running the source code (either from stdout, or a traceback in case of exception). `want` ends with a newline unless it's empty, in which case it's an empty string. The constructor adds a newline if needed. - exc_msg: The exception message generated by the example, if the example is expected to generate an exception; or `None` if it is not expected to generate an exception. This exception message is compared against the return value of `traceback.format_exception_only()`. `exc_msg` ends with a newline unless it's `None`. The constructor adds a newline if needed. - lineno: The line number within the DocTest string containing this Example where the Example begins. This line number is zero-based, with respect to the beginning of the DocTest. - indent: The example's indentation in the DocTest string. I.e., the number of space characters that precede the example's first prompt. - options: A dictionary mapping from option flags to True or False, which is used to override default options for this example. Any option flags not contained in this dictionary are left at their default value (as specified by the DocTestRunner's optionflags). By default, no options are set. """ def __init__(self, source, want, exc_msg=None, lineno=0, indent=0, options=None): # Normalize inputs. if not source.endswith('\n'): source += '\n' if want and not want.endswith('\n'): want += '\n' if exc_msg is not None and not exc_msg.endswith('\n'): exc_msg += '\n' # Store properties. self.source = source self.want = want self.lineno = lineno self.indent = indent if options is None: options = {} self.options = options self.exc_msg = exc_msg def __eq__(self, other): if type(self) is not type(other): return NotImplemented return self.source == other.source and \ self.want == other.want and \ self.lineno == other.lineno and \ self.indent == other.indent and \ self.options == other.options and \ self.exc_msg == other.exc_msg def __hash__(self): return hash((self.source, self.want, self.lineno, self.indent, self.exc_msg)) class DocTest: """ A collection of doctest examples that should be run in a single namespace. Each `DocTest` defines the following attributes: - examples: the list of examples. - globs: The namespace (aka globals) that the examples should be run in. - name: A name identifying the DocTest (typically, the name of the object whose docstring this DocTest was extracted from). - filename: The name of the file that this DocTest was extracted from, or `None` if the filename is unknown. - lineno: The line number within filename where this DocTest begins, or `None` if the line number is unavailable. This line number is zero-based, with respect to the beginning of the file. - docstring: The string that the examples were extracted from, or `None` if the string is unavailable. """ def __init__(self, examples, globs, name, filename, lineno, docstring): """ Create a new DocTest containing the given examples. The DocTest's globals are initialized with a copy of `globs`. """ assert not isinstance(examples, str), \ "DocTest no longer accepts str; use DocTestParser instead" self.examples = examples self.docstring = docstring self.globs = globs.copy() self.name = name self.filename = filename self.lineno = lineno def __repr__(self): if len(self.examples) == 0: examples = 'no examples' elif len(self.examples) == 1: examples = '1 example' else: examples = '%d examples' % len(self.examples) return ('<%s %s from %s:%s (%s)>' % (self.__class__.__name__, self.name, self.filename, self.lineno, examples)) def __eq__(self, other): if type(self) is not type(other): return NotImplemented return self.examples == other.examples and \ self.docstring == other.docstring and \ self.globs == other.globs and \ self.name == other.name and \ self.filename == other.filename and \ self.lineno == other.lineno def __hash__(self): return hash((self.docstring, self.name, self.filename, self.lineno)) # This lets us sort tests by name: def __lt__(self, other): if not isinstance(other, DocTest): return NotImplemented self_lno = self.lineno if self.lineno is not None else -1 other_lno = other.lineno if other.lineno is not None else -1 return ((self.name, self.filename, self_lno, id(self)) < (other.name, other.filename, other_lno, id(other))) ###################################################################### ## 3. DocTestParser ###################################################################### class DocTestParser: """ A class used to parse strings containing doctest examples. """ # This regular expression is used to find doctest examples in a # string. It defines three groups: `source` is the source code # (including leading indentation and prompts); `indent` is the # indentation of the first (PS1) line of the source code; and # `want` is the expected output (including leading indentation). _EXAMPLE_RE = re.compile(r''' # Source consists of a PS1 line followed by zero or more PS2 lines. (?P<source> (?:^(?P<indent> [ ]*) >>> .*) # PS1 line (?:\n [ ]* \.\.\. .*)*) # PS2 lines \n? # Want consists of any non-blank lines that do not start with PS1. (?P<want> (?:(?![ ]*$) # Not a blank line (?![ ]*>>>) # Not a line starting with PS1 .+$\n? # But any other line )*) ''', re.MULTILINE | re.VERBOSE) # A regular expression for handling `want` strings that contain # expected exceptions. It divides `want` into three pieces: # - the traceback header line (`hdr`) # - the traceback stack (`stack`) # - the exception message (`msg`), as generated by # traceback.format_exception_only() # `msg` may have multiple lines. We assume/require that the # exception message is the first non-indented line starting with a word # character following the traceback header line. _EXCEPTION_RE = re.compile(r""" # Grab the traceback header. Different versions of Python have # said different things on the first traceback line. ^(?P<hdr> Traceback\ \( (?: most\ recent\ call\ last | innermost\ last ) \) : ) \s* $ # toss trailing whitespace on the header. (?P<stack> .*?) # don't blink: absorb stuff until... ^ (?P<msg> \w+ .*) # a line *starts* with alphanum. """, re.VERBOSE | re.MULTILINE | re.DOTALL) # A callable returning a true value iff its argument is a blank line # or contains a single comment. _IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match def parse(self, string, name='<string>'): """ Divide the given string into examples and intervening text, and return them as a list of alternating Examples and strings. Line numbers for the Examples are 0-based. The optional argument `name` is a name identifying this string, and is only used for error messages. """ string = string.expandtabs() # If all lines begin with the same indentation, then strip it. min_indent = self._min_indent(string) if min_indent > 0: string = '\n'.join([l[min_indent:] for l in string.split('\n')]) output = [] charno, lineno = 0, 0 # Find all doctest examples in the string: for m in self._EXAMPLE_RE.finditer(string): # Add the pre-example text to `output`. output.append(string[charno:m.start()]) # Update lineno (lines before this example) lineno += string.count('\n', charno, m.start()) # Extract info from the regexp match. (source, options, want, exc_msg) = \ self._parse_example(m, name, lineno) # Create an Example, and add it to the list. if not self._IS_BLANK_OR_COMMENT(source): output.append( Example(source, want, exc_msg, lineno=lineno, indent=min_indent+len(m.group('indent')), options=options) ) # Update lineno (lines inside this example) lineno += string.count('\n', m.start(), m.end()) # Update charno. charno = m.end() # Add any remaining post-example text to `output`. output.append(string[charno:]) return output def get_doctest(self, string, globs, name, filename, lineno): """ Extract all doctest examples from the given string, and collect them into a `DocTest` object. `globs`, `name`, `filename`, and `lineno` are attributes for the new `DocTest` object. See the documentation for `DocTest` for more information. """ return DocTest(self.get_examples(string, name), globs, name, filename, lineno, string) def get_examples(self, string, name='<string>'): """ Extract all doctest examples from the given string, and return them as a list of `Example` objects. Line numbers are 0-based, because it's most common in doctests that nothing interesting appears on the same line as opening triple-quote, and so the first interesting line is called \"line 1\" then. The optional argument `name` is a name identifying this string, and is only used for error messages. """ return [x for x in self.parse(string, name) if isinstance(x, Example)] def _parse_example(self, m, name, lineno): """ Given a regular expression match from `_EXAMPLE_RE` (`m`), return a pair `(source, want)`, where `source` is the matched example's source code (with prompts and indentation stripped); and `want` is the example's expected output (with indentation stripped). `name` is the string's name, and `lineno` is the line number where the example starts; both are used for error messages. """ # Get the example's indentation level. indent = len(m.group('indent')) # Divide source into lines; check that they're properly # indented; and then strip their indentation & prompts. source_lines = m.group('source').split('\n') self._check_prompt_blank(source_lines, indent, name, lineno) self._check_prefix(source_lines[1:], ' '*indent + '.', name, lineno) source = '\n'.join([sl[indent+4:] for sl in source_lines]) # Divide want into lines; check that it's properly indented; and # then strip the indentation. Spaces before the last newline should # be preserved, so plain rstrip() isn't good enough. want = m.group('want') want_lines = want.split('\n') if len(want_lines) > 1 and re.match(r' *$', want_lines[-1]): del want_lines[-1] # forget final newline & spaces after it self._check_prefix(want_lines, ' '*indent, name, lineno + len(source_lines)) want = '\n'.join([wl[indent:] for wl in want_lines]) # If `want` contains a traceback message, then extract it. m = self._EXCEPTION_RE.match(want) if m: exc_msg = m.group('msg') else: exc_msg = None # Extract options from the source. options = self._find_options(source, name, lineno) return source, options, want, exc_msg # This regular expression looks for option directives in the # source code of an example. Option directives are comments # starting with "doctest:". Warning: this may give false # positives for string-literals that contain the string # "#doctest:". Eliminating these false positives would require # actually parsing the string; but we limit them by ignoring any # line containing "#doctest:" that is *followed* by a quote mark. _OPTION_DIRECTIVE_RE = re.compile(r'#\s*doctest:\s*([^\n\'"]*)$', re.MULTILINE) def _find_options(self, source, name, lineno): """ Return a dictionary containing option overrides extracted from option directives in the given source string. `name` is the string's name, and `lineno` is the line number where the example starts; both are used for error messages. """ options = {} # (note: with the current regexp, this will match at most once:) for m in self._OPTION_DIRECTIVE_RE.finditer(source): option_strings = m.group(1).replace(',', ' ').split() for option in option_strings: if (option[0] not in '+-' or option[1:] not in OPTIONFLAGS_BY_NAME): raise ValueError('line %r of the doctest for %s ' 'has an invalid option: %r' % (lineno+1, name, option)) flag = OPTIONFLAGS_BY_NAME[option[1:]] options[flag] = (option[0] == '+') if options and self._IS_BLANK_OR_COMMENT(source): raise ValueError('line %r of the doctest for %s has an option ' 'directive on a line with no example: %r' % (lineno, name, source)) return options # This regular expression finds the indentation of every non-blank # line in a string. _INDENT_RE = re.compile(r'^([ ]*)(?=\S)', re.MULTILINE) def _min_indent(self, s): "Return the minimum indentation of any non-blank line in `s`" indents = [len(indent) for indent in self._INDENT_RE.findall(s)] if len(indents) > 0: return min(indents) else: return 0 def _check_prompt_blank(self, lines, indent, name, lineno): """ Given the lines of a source string (including prompts and leading indentation), check to make sure that every prompt is followed by a space character. If any line is not followed by a space character, then raise ValueError. """ for i, line in enumerate(lines): if len(line) >= indent+4 and line[indent+3] != ' ': raise ValueError('line %r of the docstring for %s ' 'lacks blank after %s: %r' % (lineno+i+1, name, line[indent:indent+3], line)) def _check_prefix(self, lines, prefix, name, lineno): """ Check that every line in the given list starts with the given prefix; if any line does not, then raise a ValueError. """ for i, line in enumerate(lines): if line and not line.startswith(prefix): raise ValueError('line %r of the docstring for %s has ' 'inconsistent leading whitespace: %r' % (lineno+i+1, name, line)) ###################################################################### ## 4. DocTest Finder ###################################################################### class DocTestFinder: """ A class used to extract the DocTests that are relevant to a given object, from its docstring and the docstrings of its contained objects. Doctests can currently be extracted from the following object types: modules, functions, classes, methods, staticmethods, classmethods, and properties. """ def __init__(self, verbose=False, parser=DocTestParser(), recurse=True, exclude_empty=True): """ Create a new doctest finder. The optional argument `parser` specifies a class or function that should be used to create new DocTest objects (or objects that implement the same interface as DocTest). The signature for this factory function should match the signature of the DocTest constructor. If the optional argument `recurse` is false, then `find` will only examine the given object, and not any contained objects. If the optional argument `exclude_empty` is false, then `find` will include tests for objects with empty docstrings. """ self._parser = parser self._verbose = verbose self._recurse = recurse self._exclude_empty = exclude_empty def find(self, obj, name=None, module=None, globs=None, extraglobs=None): """ Return a list of the DocTests that are defined by the given object's docstring, or by any of its contained objects' docstrings. The optional parameter `module` is the module that contains the given object. If the module is not specified or is None, then the test finder will attempt to automatically determine the correct module. The object's module is used: - As a default namespace, if `globs` is not specified. - To prevent the DocTestFinder from extracting DocTests from objects that are imported from other modules. - To find the name of the file containing the object. - To help find the line number of the object within its file. Contained objects whose module does not match `module` are ignored. If `module` is False, no attempt to find the module will be made. This is obscure, of use mostly in tests: if `module` is False, or is None but cannot be found automatically, then all objects are considered to belong to the (non-existent) module, so all contained objects will (recursively) be searched for doctests. The globals for each DocTest is formed by combining `globs` and `extraglobs` (bindings in `extraglobs` override bindings in `globs`). A new copy of the globals dictionary is created for each DocTest. If `globs` is not specified, then it defaults to the module's `__dict__`, if specified, or {} otherwise. If `extraglobs` is not specified, then it defaults to {}. """ # If name was not specified, then extract it from the object. if name is None: name = getattr(obj, '__name__', None) if name is None: raise ValueError("DocTestFinder.find: name must be given " "when obj.__name__ doesn't exist: %r" % (type(obj),)) # Find the module that contains the given object (if obj is # a module, then module=obj.). Note: this may fail, in which # case module will be None. if module is False: module = None elif module is None: module = inspect.getmodule(obj) # Read the module's source code. This is used by # DocTestFinder._find_lineno to find the line number for a # given object's docstring. try: file = inspect.getsourcefile(obj) except (TypeError, OSError): source_lines = None else: if not file: # Check to see if it's one of our special internal "files" # (see __patched_linecache_getlines). file = inspect.getfile(obj) if not file[0]+file[-2:] == '<]>': file = None if file is None: source_lines = None else: if module is not None: # Supply the module globals in case the module was # originally loaded via a PEP 302 loader and # file is not a valid filesystem path source_lines = linecache.getlines(file, module.__dict__) else: # No access to a loader, so assume it's a normal # filesystem path source_lines = linecache.getlines(file) if not source_lines: source_lines = None # Initialize globals, and merge in extraglobs. if globs is None: if module is None: globs = {} else: globs = module.__dict__.copy() else: globs = globs.copy() if extraglobs is not None: globs.update(extraglobs) if '__name__' not in globs: globs['__name__'] = '__main__' # provide a default module name # Recursively explore `obj`, extracting DocTests. tests = [] self._find(tests, obj, name, module, source_lines, globs, {}) # Sort the tests by alpha order of names, for consistency in # verbose-mode output. This was a feature of doctest in Pythons # <= 2.3 that got lost by accident in 2.4. It was repaired in # 2.4.4 and 2.5. tests.sort() return tests def _from_module(self, module, object): """ Return true if the given object is defined in the given module. """ if module is None: return True elif inspect.getmodule(object) is not None: return module is inspect.getmodule(object) elif inspect.isfunction(object): return module.__dict__ is object.__globals__ elif (inspect.ismethoddescriptor(object) or inspect.ismethodwrapper(object)): if hasattr(object, '__objclass__'): obj_mod = object.__objclass__.__module__ elif hasattr(object, '__module__'): obj_mod = object.__module__ else: return True # [XX] no easy way to tell otherwise return module.__name__ == obj_mod elif inspect.isclass(object): return module.__name__ == object.__module__ elif hasattr(object, '__module__'): return module.__name__ == object.__module__ elif isinstance(object, property): return True # [XX] no way not be sure. else: raise ValueError("object must be a class or function") |
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