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# -*- coding: utf-8 -*-
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"""Support for wildcard pattern matching in object inspection.
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Authors
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-------
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- Jörgen Stenarson <jorgen.stenarson@bostream.nu>
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- Thomas Kluyver
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"""
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#*****************************************************************************
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# Copyright (C) 2005 Jörgen Stenarson <jorgen.stenarson@bostream.nu>
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#*****************************************************************************
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import re
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import types
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from IPython.utils.dir2 import dir2
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def create_typestr2type_dicts(dont_include_in_type2typestr=["lambda"]):
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"""Return dictionaries mapping lower case typename (e.g. 'tuple') to type
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objects from the types package, and vice versa."""
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typenamelist = [tname for tname in dir(types) if tname.endswith("Type")]
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typestr2type, type2typestr = {}, {}
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for tname in typenamelist:
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name = tname[:-4].lower() # Cut 'Type' off the end of the name
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obj = getattr(types, tname)
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typestr2type[name] = obj
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if name not in dont_include_in_type2typestr:
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type2typestr[obj] = name
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return typestr2type, type2typestr
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typestr2type, type2typestr = create_typestr2type_dicts()
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def is_type(obj, typestr_or_type):
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"""is_type(obj, typestr_or_type) verifies if obj is of a certain type. It
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can take strings or actual python types for the second argument, i.e.
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'tuple'<->TupleType. 'all' matches all types.
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TODO: Should be extended for choosing more than one type."""
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if typestr_or_type == "all":
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return True
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if type(typestr_or_type) == type:
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test_type = typestr_or_type
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else:
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test_type = typestr2type.get(typestr_or_type, False)
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if test_type:
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return isinstance(obj, test_type)
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return False
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def show_hidden(str, show_all=False):
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"""Return true for strings starting with single _ if show_all is true."""
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return show_all or str.startswith("__") or not str.startswith("_")
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def dict_dir(obj):
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"""Produce a dictionary of an object's attributes. Builds on dir2 by
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checking that a getattr() call actually succeeds."""
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ns = {}
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for key in dir2(obj):
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# This seemingly unnecessary try/except is actually needed
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# because there is code out there with metaclasses that
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# create 'write only' attributes, where a getattr() call
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# will fail even if the attribute appears listed in the
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# object's dictionary. Properties can actually do the same
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# thing. In particular, Traits use this pattern
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try:
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ns[key] = getattr(obj, key)
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except AttributeError:
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pass
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return ns
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def filter_ns(ns, name_pattern="*", type_pattern="all", ignore_case=True,
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show_all=True):
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"""Filter a namespace dictionary by name pattern and item type."""
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pattern = name_pattern.replace("*",".*").replace("?",".")
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if ignore_case:
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reg = re.compile(pattern+"$", re.I)
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else:
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reg = re.compile(pattern+"$")
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# Check each one matches regex; shouldn't be hidden; of correct type.
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return dict((key,obj) for key, obj in ns.items() if reg.match(key) \
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and show_hidden(key, show_all) \
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and is_type(obj, type_pattern) )
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def list_namespace(namespace, type_pattern, filter, ignore_case=False, show_all=False):
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"""Return dictionary of all objects in a namespace dictionary that match
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type_pattern and filter."""
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pattern_list=filter.split(".")
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if len(pattern_list) == 1:
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return filter_ns(namespace, name_pattern=pattern_list[0],
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type_pattern=type_pattern,
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ignore_case=ignore_case, show_all=show_all)
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else:
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# This is where we can change if all objects should be searched or
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# only modules. Just change the type_pattern to module to search only
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# modules
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filtered = filter_ns(namespace, name_pattern=pattern_list[0],
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type_pattern="all",
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ignore_case=ignore_case, show_all=show_all)
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results = {}
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for name, obj in filtered.items():
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ns = list_namespace(dict_dir(obj), type_pattern,
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".".join(pattern_list[1:]),
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ignore_case=ignore_case, show_all=show_all)
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for inner_name, inner_obj in ns.items():
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results["%s.%s"%(name,inner_name)] = inner_obj
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return results
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