Vadim Zaytsev aka @grammarware

GraSs: A Taxonomy of Grammar Smells

Organisation
global problems

Navigation
problems with navigating through the grammar

Structure
harmful relationships among grammar components

Proxy
indirect uses

Dependency
antipatterns in use

Complexity
metric-based smells

Chain
right hand side is a nonterminal

Throwaway
a nonterminal used only once

Weak
a nonterminal does not form a proper abstraction

Ghost
a subexpression that should have been a nonterminal

Multitool
a nonterminal that represents two or more concepts

Multitool Edit!

Related smells: God Class, God Class, Swiss Army Knife, Multifaceted Abstraction, Brother of the Bride, Multifaceted Abstraction

This smells takes place when a nonterminal violates the single responsibility principle, and represents several (hopefully related) abstractions.

The GraSs taxonomy is a joint effort maintained by Dr. Vadim Zaytsev a.k.a. @grammarware. Page last updated in March 2021.

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