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add Interpreter pattern

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Jakub Vojvoda
2016-09-23 00:04:37 +02:00
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## Interpreter
Given a language, the pattern defines a represention for its grammar along with an
interpreter that uses the representation to interpret sentences in the language.
The Interpreter pattern has behavioral purpose and applies to the classes.
### When to use
* when the grammar is simple (in case of complex grammars, there are better alternatives)
* efficiency is not a critical concern