Mercurial > hgrepos > Python > libs > ConfigMix

comparison configmix/variables.py @ 305:f529ca46dd50

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Implemented the "ref" namespace to get configuration tree references. BUGS: - Tests should be done more thoroughly and extensively - Interaction of tree references and variable substitution should be tested more properly - Documentation is missing yet
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 26 Apr 2021 09:42:42 +0200
parents eed16a1ec8f3
children d7daec119383
comparison
equal deleted inserted replaced
304:d8361dd70d2d 305:f529ca46dd50
1 # -*- coding: utf-8 -*- 1 # -*- coding: utf-8 -*-
2 # :- 2 # :-
3 # :Copyright: (c) 2015-2020, Franz Glasner. All rights reserved. 3 # :Copyright: (c) 2015-2021, Franz Glasner. All rights reserved.
4 # :License: BSD-3-Clause. See LICENSE.txt for details. 4 # :License: BSD-3-Clause. See LICENSE.txt for details.
5 # :- 5 # :-
6 """Variable interpolation: implementation of namespaces and filters 6 """Variable interpolation: implementation of namespaces and filters
7 7
8 """ 8 """
16 import os 16 import os
17 import platform 17 import platform
18 from functools import wraps 18 from functools import wraps
19 19
20 from .compat import PY2, native_os_str_to_text, u 20 from .compat import PY2, native_os_str_to_text, u
21 from .constants import REF_NAMESPACE
21 22
22 23
23 _MARKER = object() 24 _MARKER = object()
24 25
25 26
72 73
73 def add_varns(name, fn): 74 def add_varns(name, fn):
74 """Register a new variable namespace `name` and it's implementing 75 """Register a new variable namespace `name` and it's implementing
75 function `fn` 76 function `fn`
76 77
77 """ 78 ..note:: This function checks that `name` is not the special
79 namespace :data:`~configmix.constants.REF_NAMESPACE`.
80
81 """
82 if name == REF_NAMESPACE:
83 raise ValueError(
84 "the special namespace `%s' is not allowed here" % REF_NAMESPACE)
78 _varns_registry[name] = fn 85 _varns_registry[name] = fn
79 86
80 87
81 def lookup_varns(name): 88 def lookup_varns(name):
82 """Lookup the variable namespace `name` and return it's implementing 89 """Lookup the variable namespace `name` and return it's implementing
84 91
85 :param str name: the namespace name 92 :param str name: the namespace name
86 :returns: the implementing function 93 :returns: the implementing function
87 :exception KeyError: if the namespace `name` doesn't exist 94 :exception KeyError: if the namespace `name` doesn't exist
88 95
89 """ 96 ..note:: This function checks that `name` is not the special
97 namespace :data:`~configmix.constants.REF_NAMESPACE`.
98
99 """
100 if name == REF_NAMESPACE:
101 raise ValueError(
102 "the special namespace `%s' is not allowed here" % REF_NAMESPACE)
90 return _varns_registry[_normalized(name)] 103 return _varns_registry[_normalized(name)]
91 104
92 105
93 _filter_registry = {} 106 _filter_registry = {}
94 """Filter registry""" 107 """Filter registry"""