- Added DocTestParser.parse(), which parses a docstring into Examples
and intervening text strings. - Removed DocTestParser.get_program(): use script_from_examples() instead. - Fixed bug in DocTestParser._INDENT_RE - Fixed bug in DocTestParser._min_indent - Moved _want_comment() to the utility function section
This commit is contained in:
Edward Loper
parent
57d88e5abd
commit
00f8da77e7
221
Lib/doctest.py
221
Lib/doctest.py
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@ -433,6 +433,14 @@ def _ellipsis_match(want, got):
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return True
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def _comment_line(line):
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"Return a commented form of the given line"
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line = line.rstrip()
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if line:
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return '# '+line
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else:
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return '#'
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######################################################################
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## 2. Example & DocTest
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######################################################################
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@ -606,6 +614,45 @@ class DocTestParser:
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# or contains a single comment.
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_IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match
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def parse(self, string, name='<string>'):
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"""
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Divide the given string into examples and intervening text,
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and return them as a list of alternating Examples and strings.
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Line numbers for the Examples are 0-based. The optional
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argument `name` is a name identifying this string, and is only
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used for error messages.
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"""
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string = string.expandtabs()
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# If all lines begin with the same indentation, then strip it.
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min_indent = self._min_indent(string)
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if min_indent > 0:
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string = '\n'.join([l[min_indent:] for l in string.split('\n')])
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output = []
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charno, lineno = 0, 0
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# Find all doctest examples in the string:
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for m in self._EXAMPLE_RE.finditer(string.expandtabs()):
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# Add the pre-example text to `output`.
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output.append(string[charno:m.start()])
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# Update lineno (lines before this example)
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lineno += string.count('\n', charno, m.start())
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# Extract info from the regexp match.
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(source, options, want, exc_msg) = \
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self._parse_example(m, name, lineno)
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# Create an Example, and add it to the list.
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if not self._IS_BLANK_OR_COMMENT(source):
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output.append( Example(source, want, exc_msg,
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lineno=lineno,
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indent=min_indent+len(m.group('indent')),
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options=options) )
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# Update lineno (lines inside this example)
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lineno += string.count('\n', m.start(), m.end())
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# Update charno.
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charno = m.end()
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# Add any remaining post-example text to `output`.
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output.append(string[charno:])
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return output
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def get_doctest(self, string, globs, name, filename, lineno):
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"""
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Extract all doctest examples from the given string, and
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@ -628,124 +675,9 @@ class DocTestParser:
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The optional argument `name` is a name identifying this
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string, and is only used for error messages.
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>>> text = '''
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... >>> x, y = 2, 3 # no output expected
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... >>> if 1:
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... ... print x
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... ... print y
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... 2
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... 3
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...
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... Some text.
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... >>> x+y
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... 5
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... '''
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>>> for x in DocTestParser().get_examples(text):
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... print (x.source, x.want, x.lineno)
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('x, y = 2, 3 # no output expected\\n', '', 1)
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('if 1:\\n print x\\n print y\\n', '2\\n3\\n', 2)
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('x+y\\n', '5\\n', 9)
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"""
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examples = []
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charno, lineno = 0, 0
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# Find all doctest examples in the string:
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for m in self._EXAMPLE_RE.finditer(string.expandtabs()):
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# Update lineno (lines before this example)
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lineno += string.count('\n', charno, m.start())
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# Extract source/want from the regexp match.
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(source, want, exc_msg) = self._parse_example(m, name, lineno)
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# Extract extra options from the source.
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options = self._find_options(source, name, lineno)
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# Create an Example, and add it to the list.
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if not self._IS_BLANK_OR_COMMENT(source):
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examples.append( Example(source, want, exc_msg,
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lineno=lineno,
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indent=len(m.group('indent')),
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options=options) )
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# Update lineno (lines inside this example)
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lineno += string.count('\n', m.start(), m.end())
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# Update charno.
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charno = m.end()
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return examples
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def get_program(self, string, name="<string>"):
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"""
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Return an executable program from the given string, as a string.
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The format of this isn't rigidly defined. In general, doctest
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examples become the executable statements in the result, and
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their expected outputs become comments, preceded by an \"#Expected:\"
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comment. Everything else (text, comments, everything not part of
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a doctest test) is also placed in comments.
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The optional argument `name` is a name identifying this
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string, and is only used for error messages.
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>>> text = '''
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... >>> x, y = 2, 3 # no output expected
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... >>> if 1:
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... ... print x
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... ... print y
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... 2
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... 3
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...
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... Some text.
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... >>> x+y
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... 5
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... '''
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>>> print DocTestParser().get_program(text)
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x, y = 2, 3 # no output expected
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if 1:
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print x
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print y
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# Expected:
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## 2
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## 3
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#
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# Some text.
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x+y
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# Expected:
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## 5
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"""
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string = string.expandtabs()
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# If all lines begin with the same indentation, then strip it.
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min_indent = self._min_indent(string)
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if min_indent > 0:
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string = '\n'.join([l[min_indent:] for l in string.split('\n')])
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output = []
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charnum, lineno = 0, 0
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# Find all doctest examples in the string:
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for m in self._EXAMPLE_RE.finditer(string.expandtabs()):
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# Add any text before this example, as a comment.
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if m.start() > charnum:
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lines = string[charnum:m.start()-1].split('\n')
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output.extend([self._comment_line(l) for l in lines])
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lineno += len(lines)
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# Extract source/want from the regexp match.
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(source, want, exc_msg) = self._parse_example(m, name, lineno)
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# Display the source
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output.append(source)
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# Display the expected output, if any
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if want:
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output.append('# Expected:')
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output.extend(['## '+l for l in want.split('\n')])
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# Update the line number & char number.
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lineno += string.count('\n', m.start(), m.end())
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charnum = m.end()
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# Add any remaining text, as comments.
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output.extend([self._comment_line(l)
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for l in string[charnum:].split('\n')])
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# Trim junk on both ends.
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while output and output[-1] == '#':
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output.pop()
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while output and output[0] == '#':
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output.pop(0)
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# Combine the output, and return it.
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return '\n'.join(output)
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return [x for x in self.parse(string, name)
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if isinstance(x, Example)]
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def _parse_example(self, m, name, lineno):
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"""
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@ -786,7 +718,10 @@ class DocTestParser:
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else:
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exc_msg = None
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return source, want, exc_msg
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# Extract options from the source.
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options = self._find_options(source, name, lineno)
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return source, options, want, exc_msg
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# This regular expression looks for option directives in the
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# source code of an example. Option directives are comments
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@ -826,19 +761,15 @@ class DocTestParser:
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# This regular expression finds the indentation of every non-blank
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# line in a string.
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_INDENT_RE = re.compile('^([ ]+)(?=\S)', re.MULTILINE)
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_INDENT_RE = re.compile('^([ ]*)(?=\S)', re.MULTILINE)
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def _min_indent(self, s):
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"Return the minimum indentation of any non-blank line in `s`"
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return min([len(indent) for indent in self._INDENT_RE.findall(s)])
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def _comment_line(self, line):
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"Return a commented form of the given line"
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line = line.rstrip()
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if line:
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return '# '+line
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indents = [len(indent) for indent in self._INDENT_RE.findall(s)]
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if len(indents) > 0:
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return min(indents)
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else:
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return '#'
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return 0
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def _check_prompt_blank(self, lines, indent, name, lineno):
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"""
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@ -2319,25 +2250,31 @@ def script_from_examples(s):
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if 0:
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blah
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blah
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<BLANKLINE>
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#
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# Ho hum
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"""
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output = []
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for piece in DocTestParser().parse(s):
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if isinstance(piece, Example):
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# Add the example's source code (strip trailing NL)
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output.append(piece.source[:-1])
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# Add the expected output:
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want = piece.want
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if want:
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output.append('# Expected:')
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output += ['## '+l for l in want.split('\n')[:-1]]
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else:
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# Add non-example text.
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output += [_comment_line(l)
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for l in piece.split('\n')[:-1]]
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return DocTestParser().get_program(s)
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def _want_comment(example):
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"""
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Return a comment containing the expected output for the given example.
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"""
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# Return the expected output, if any
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want = example.want
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if want:
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if want[-1] == '\n':
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want = want[:-1]
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want = "\n# ".join(want.split("\n"))
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want = "\n# Expected:\n# %s" % want
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return want
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# Trim junk on both ends.
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while output and output[-1] == '#':
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output.pop()
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while output and output[0] == '#':
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output.pop(0)
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# Combine the output, and return it.
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return '\n'.join(output)
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def testsource(module, name):
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"""Extract the test sources from a doctest docstring as a script.
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@ -283,7 +283,7 @@ expected output of an example, then `DocTest` will raise a ValueError:
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... '''
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>>> parser.get_doctest(docstring, globs, 'some_test', 'filename', 0)
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Traceback (most recent call last):
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ValueError: line 4 of the docstring for some_test has inconsistent leading whitespace: ' indentation'
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ValueError: line 4 of the docstring for some_test has inconsistent leading whitespace: 'indentation'
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If the docstring contains inconsistent leading whitespace on
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continuation lines, then `DocTest` will raise a ValueError:
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@ -295,7 +295,7 @@ continuation lines, then `DocTest` will raise a ValueError:
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... '''
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>>> parser.get_doctest(docstring, globs, 'some_test', 'filename', 0)
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Traceback (most recent call last):
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ValueError: line 2 of the docstring for some_test has inconsistent leading whitespace: ' ... 2)'
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ValueError: line 2 of the docstring for some_test has inconsistent leading whitespace: '... 2)'
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If there's no blank space after a PS1 prompt ('>>>'), then `DocTest`
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will raise a ValueError:
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@ -553,6 +553,61 @@ DocTestFinder finds the line number of each example:
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[1, 9, 12]
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"""
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def test_DocTestParser(): r"""
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Unit tests for the `DocTestParser` class.
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DocTestParser is used to parse docstrings containing doctest examples.
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The `parse` method divides a docstring into examples and intervening
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text:
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>>> s = '''
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... >>> x, y = 2, 3 # no output expected
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... >>> if 1:
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... ... print x
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... ... print y
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... 2
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... 3
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...
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... Some text.
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... >>> x+y
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... 5
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... '''
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>>> parser = doctest.DocTestParser()
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>>> for piece in parser.parse(s):
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... if isinstance(piece, doctest.Example):
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... print 'Example:', (piece.source, piece.want, piece.lineno)
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... else:
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... print ' Text:', `piece`
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Text: '\n'
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Example: ('x, y = 2, 3 # no output expected\n', '', 1)
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Text: ''
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Example: ('if 1:\n print x\n print y\n', '2\n3\n', 2)
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Text: '\nSome text.\n'
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Example: ('x+y\n', '5\n', 9)
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Text: ''
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The `get_examples` method returns just the examples:
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>>> for piece in parser.get_examples(s):
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... print (piece.source, piece.want, piece.lineno)
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('x, y = 2, 3 # no output expected\n', '', 1)
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('if 1:\n print x\n print y\n', '2\n3\n', 2)
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('x+y\n', '5\n', 9)
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The `get_doctest` method creates a Test from the examples, along with the
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given arguments:
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>>> test = parser.get_doctest(s, {}, 'name', 'filename', lineno=5)
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>>> (test.name, test.filename, test.lineno)
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('name', 'filename', 5)
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>>> for piece in test.examples:
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... print (piece.source, piece.want, piece.lineno)
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('x, y = 2, 3 # no output expected\n', '', 1)
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('if 1:\n print x\n print y\n', '2\n3\n', 2)
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('x+y\n', '5\n', 9)
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"""
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class test_DocTestRunner:
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def basics(): r"""
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Unit tests for the `DocTestRunner` class.
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