273 lines
8.1 KiB
Python
273 lines
8.1 KiB
Python
''' Utilities to allow inserting docstring fragments for common
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parameters into function and method docstrings'''
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import sys
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__all__ = ['docformat', 'inherit_docstring_from', 'indentcount_lines',
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'filldoc', 'unindent_dict', 'unindent_string', 'doc_replace']
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def docformat(docstring, docdict=None):
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''' Fill a function docstring from variables in dictionary
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Adapt the indent of the inserted docs
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Parameters
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----------
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docstring : string
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docstring from function, possibly with dict formatting strings
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docdict : dict, optional
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dictionary with keys that match the dict formatting strings
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and values that are docstring fragments to be inserted. The
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indentation of the inserted docstrings is set to match the
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minimum indentation of the ``docstring`` by adding this
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indentation to all lines of the inserted string, except the
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first.
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Returns
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-------
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outstring : string
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string with requested ``docdict`` strings inserted
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Examples
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--------
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>>> docformat(' Test string with %(value)s', {'value':'inserted value'})
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' Test string with inserted value'
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>>> docstring = 'First line\\n Second line\\n %(value)s'
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>>> inserted_string = "indented\\nstring"
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>>> docdict = {'value': inserted_string}
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>>> docformat(docstring, docdict)
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'First line\\n Second line\\n indented\\n string'
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'''
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if not docstring:
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return docstring
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if docdict is None:
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docdict = {}
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if not docdict:
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return docstring
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lines = docstring.expandtabs().splitlines()
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# Find the minimum indent of the main docstring, after first line
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if len(lines) < 2:
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icount = 0
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else:
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icount = indentcount_lines(lines[1:])
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indent = ' ' * icount
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# Insert this indent to dictionary docstrings
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indented = {}
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for name, dstr in docdict.items():
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lines = dstr.expandtabs().splitlines()
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try:
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newlines = [lines[0]]
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for line in lines[1:]:
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newlines.append(indent+line)
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indented[name] = '\n'.join(newlines)
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except IndexError:
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indented[name] = dstr
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return docstring % indented
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def inherit_docstring_from(cls):
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"""
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This decorator modifies the decorated function's docstring by
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replacing occurrences of '%(super)s' with the docstring of the
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method of the same name from the class `cls`.
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If the decorated method has no docstring, it is simply given the
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docstring of `cls`s method.
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Parameters
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----------
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cls : Python class or instance
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A class with a method with the same name as the decorated method.
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The docstring of the method in this class replaces '%(super)s' in the
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docstring of the decorated method.
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Returns
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-------
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f : function
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The decorator function that modifies the __doc__ attribute
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of its argument.
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Examples
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--------
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In the following, the docstring for Bar.func created using the
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docstring of `Foo.func`.
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>>> class Foo(object):
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... def func(self):
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... '''Do something useful.'''
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... return
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...
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>>> class Bar(Foo):
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... @inherit_docstring_from(Foo)
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... def func(self):
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... '''%(super)s
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... Do it fast.
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... '''
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... return
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...
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>>> b = Bar()
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>>> b.func.__doc__
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'Do something useful.\n Do it fast.\n '
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"""
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def _doc(func):
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cls_docstring = getattr(cls, func.__name__).__doc__
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func_docstring = func.__doc__
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if func_docstring is None:
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func.__doc__ = cls_docstring
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else:
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new_docstring = func_docstring % dict(super=cls_docstring)
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func.__doc__ = new_docstring
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return func
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return _doc
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def extend_notes_in_docstring(cls, notes):
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"""
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This decorator replaces the decorated function's docstring
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with the docstring from corresponding method in `cls`.
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It extends the 'Notes' section of that docstring to include
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the given `notes`.
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"""
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def _doc(func):
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cls_docstring = getattr(cls, func.__name__).__doc__
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# If python is called with -OO option,
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# there is no docstring
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if cls_docstring is None:
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return func
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end_of_notes = cls_docstring.find(' References\n')
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if end_of_notes == -1:
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end_of_notes = cls_docstring.find(' Examples\n')
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if end_of_notes == -1:
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end_of_notes = len(cls_docstring)
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func.__doc__ = (cls_docstring[:end_of_notes] + notes +
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cls_docstring[end_of_notes:])
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return func
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return _doc
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def replace_notes_in_docstring(cls, notes):
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"""
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This decorator replaces the decorated function's docstring
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with the docstring from corresponding method in `cls`.
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It replaces the 'Notes' section of that docstring with
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the given `notes`.
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"""
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def _doc(func):
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cls_docstring = getattr(cls, func.__name__).__doc__
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notes_header = ' Notes\n -----\n'
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# If python is called with -OO option,
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# there is no docstring
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if cls_docstring is None:
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return func
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start_of_notes = cls_docstring.find(notes_header)
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end_of_notes = cls_docstring.find(' References\n')
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if end_of_notes == -1:
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end_of_notes = cls_docstring.find(' Examples\n')
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if end_of_notes == -1:
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end_of_notes = len(cls_docstring)
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func.__doc__ = (cls_docstring[:start_of_notes + len(notes_header)] +
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notes +
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cls_docstring[end_of_notes:])
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return func
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return _doc
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def indentcount_lines(lines):
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''' Minimum indent for all lines in line list
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>>> lines = [' one', ' two', ' three']
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>>> indentcount_lines(lines)
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1
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>>> lines = []
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>>> indentcount_lines(lines)
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0
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>>> lines = [' one']
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>>> indentcount_lines(lines)
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1
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>>> indentcount_lines([' '])
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0
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'''
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indentno = sys.maxsize
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for line in lines:
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stripped = line.lstrip()
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if stripped:
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indentno = min(indentno, len(line) - len(stripped))
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if indentno == sys.maxsize:
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return 0
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return indentno
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def filldoc(docdict, unindent_params=True):
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''' Return docstring decorator using docdict variable dictionary
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Parameters
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----------
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docdict : dictionary
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dictionary containing name, docstring fragment pairs
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unindent_params : {False, True}, boolean, optional
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If True, strip common indentation from all parameters in
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docdict
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Returns
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-------
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decfunc : function
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decorator that applies dictionary to input function docstring
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'''
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if unindent_params:
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docdict = unindent_dict(docdict)
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def decorate(f):
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f.__doc__ = docformat(f.__doc__, docdict)
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return f
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return decorate
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def unindent_dict(docdict):
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''' Unindent all strings in a docdict '''
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can_dict = {}
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for name, dstr in docdict.items():
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can_dict[name] = unindent_string(dstr)
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return can_dict
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def unindent_string(docstring):
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''' Set docstring to minimum indent for all lines, including first
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>>> unindent_string(' two')
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'two'
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>>> unindent_string(' two\\n three')
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'two\\n three'
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'''
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lines = docstring.expandtabs().splitlines()
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icount = indentcount_lines(lines)
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if icount == 0:
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return docstring
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return '\n'.join([line[icount:] for line in lines])
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def doc_replace(obj, oldval, newval):
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"""Decorator to take the docstring from obj, with oldval replaced by newval
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Equivalent to ``func.__doc__ = obj.__doc__.replace(oldval, newval)``
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Parameters
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----------
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obj: object
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The object to take the docstring from.
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oldval: string
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The string to replace from the original docstring.
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newval: string
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The string to replace ``oldval`` with.
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"""
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# __doc__ may be None for optimized Python (-OO)
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doc = (obj.__doc__ or '').replace(oldval, newval)
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def inner(func):
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func.__doc__ = doc
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return func
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return inner
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