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"""Context |
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A class to group occurrences and contextualize them. |
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https://github.com/rochars/trade |
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License: MIT |
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Copyright (c) 2015-2018 Rafael da Silva Rocha |
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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""" |
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from __future__ import absolute_import |
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from __future__ import division |
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import copy |
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class Context(object): |
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"""A class to group occurrences and contextualize them. |
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To contextualize a group of occurrences could be: |
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- To identify daytrades and separate them into different occurrences |
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for taxation purposes |
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- Group occurrences with the same subject into one occurrence |
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- Apply costs and other deductions to the value to the occurrences |
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- Calculate taxes based on the occurrences in the context |
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Objects from this class are created with both a list of occurrences and a |
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list of functions (called "context tasks"). |
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The context tasks are run by calling Context.apply(). Context tasks |
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run in the order they are listed. |
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Every context task function receives one argument: the context itself. It |
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is then free to manipulate the raw occurrence data stored in the |
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Context.occurrences list. |
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The contextualized occurrence data is then stored in the |
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Context.contextualized list. |
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The occurrences in Context.contextualized should be informed to a Holder |
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as regular occurrences. |
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The original Occurrence list is not modified. |
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""" |
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def __init__(self, occurrences, tasks): |
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self.occurrences = occurrences |
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self.tasks = tasks |
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self.contextualized = [] |
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def apply(self): |
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"""Apply the rules of the context to its occurrences. |
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This method executes all the functions defined in |
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self.tasks in the order they are listed. |
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Every function that acts as a context task receives the |
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Context object itself as its only argument. |
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The contextualized occurrences are then stored in |
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Context.contextualized. |
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The original Occurrence instances are not modified. |
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""" |
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raw_operations = copy.deepcopy(self.occurrences) |
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for task in self.tasks: |
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task(self) |
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self.occurrences = raw_operations |
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rochars /
trade
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