16030aeec8
This commit reworks mechanism how context chain is built at each point. The goal was to make entire chain be dependent on format version number. This would allow for example to use yaql 1.0 legacy mode context for MuranoPL/1.0 and not to use it for 2.0. Not the entire chain is built on demand up to the root instead of attaching to existed parent context as it was before. DSL host (engine) is no more required to have custom MuranoDslExecutor implementation but a new ContextManager interface that is used to control contexts on each layer. Engine uses this interface to register system classes and engine level yaql functions. Also a ContextManager is a foundation for method mocking because now all MuranoPL methods are yaql functions stored in context and with ContextManager it is possible to inject/replace function in each scope ( global, package, class, object) Partially implements: blueprint murano-versioning Change-Id: I0a553e8044061fe780a83bc04d70b8f80580988f
70 lines
2.5 KiB
Python
70 lines
2.5 KiB
Python
# Copyright (c) 2015 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from yaql.language import contexts
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from yaql.language import utils
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class LinkedContext(contexts.ContextBase):
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"""Context that is as a proxy to another context but has its own parent."""
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def __init__(self, parent_context, linked_context, convention=None):
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self.linked_context = linked_context
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if linked_context.parent:
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super(LinkedContext, self).__init__(
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LinkedContext(parent_context, linked_context.parent,
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convention), convention)
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else:
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super(LinkedContext, self).__init__(parent_context, convention)
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def register_function(self, spec, *args, **kwargs):
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return self.linked_context.register_function(spec, *args, **kwargs)
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def keys(self):
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return self.linked_context.keys()
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def get_data(self, name, default=None, ask_parent=True):
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result = self.linked_context.get_data(
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name, default=utils.NO_VALUE, ask_parent=False)
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if result is utils.NO_VALUE:
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if not ask_parent or not self.parent:
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return default
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return self.parent.get_data(name, default=default, ask_parent=True)
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return result
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def get_functions(self, name, predicate=None, use_convention=False):
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return self.linked_context.get_functions(
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name, predicate=predicate, use_convention=use_convention)
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def delete_function(self, spec):
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return self.linked_context.delete_function(spec)
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def __contains__(self, item):
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return item in self.linked_context
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def __delitem__(self, name):
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del self.linked_context[name]
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def __setitem__(self, name, value):
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self.linked_context[name] = value
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def create_child_context(self):
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return type(self.linked_context)(self)
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def link(parent_context, context):
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if not context:
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return parent_context
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return LinkedContext(parent_context, context)
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