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Contents
# frozen_string_literal: true
require 'set'
require_relative 'base_detector'
module Reek
module SmellDetectors
#
# Class variables form part of the global runtime state, and as such make
# it easy for one part of the system to accidentally or inadvertently
# depend on another part of the system. So the system becomes more prone to
# problems where changing something over here breaks something over there.
# In particular, class variables can make it hard to set up tests (because
# the context of the test includes all global state).
#
# See {file:docs/Class-Variable.md} for details.
class ClassVariable < BaseDetector
def self.contexts # :nodoc:
[:class, :module]
end
#
# Checks whether the given class or module declares any class variables.
#
# @return [Array<SmellWarning>]
#
def sniff
class_variables_in_context.map do |variable, occurrences|
lines = occurrences.map(&:line)
smell_warning(
lines: lines,
message: "declares the class variable '#{variable}'",
parameters: { name: variable.to_s })
end
end
#
# Collects the names of the class variables declared and/or used
# in the given module.
#
def class_variables_in_context
context.local_nodes([:cvar, :cvasgn, :cvdecl]).group_by(&:name)
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems