What is the need for Interpreter Pattern
in C# (C Sharp)?

• Define grammar for that language
• Define interpreter to interpret the statements available in that language
o Fetch tokens by parsing the symbols available in the language
o Use tokens to decide on appropriate actions.
o Execute the decided actions.

Advantage of using interpreter pattern is its flexibility. Using interpreter pattern, each of the parsing scenarios will be considered as a different object and the objects will be connected using a parse tree. When there is a necessity to change any of the parsing scenarios, you can easily change it in the parse tree without any consequences and with less coding change.

However there are certain consequences in using interpreter pattern.

They are:

• User interface has to be provided for the User to feed in commands for the language
• Considerable effort for defining and building parsing techniques
• Extensive checking of error occurrences due to grammatical elements that are misplaced or misspelled
• If the grammar associated with the language becomes complex, your code might not be easily maintainable

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