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Versions: 29
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Contents
class ImageOptim
class BinResolver
# Allows to externalize conditions for an instance of Comparable to use in
# case statemens
#
# is = ComparableCondition.is
# case rand(100)
# when is < 10 then # ...
# when is.between?(13, 23) then # ...
# when is >= 90 then # ...
# end
class ComparableCondition
# Helper class for creating conditions using ComparableCondition.is
class Builder
Comparable.instance_methods.each do |method|
define_method method do |*args|
ComparableCondition.new(method, *args)
end
end
end
def self.is
Builder.new
end
attr_reader :method, :args
def initialize(method, *args)
@method, @args = method.to_sym, args
case @method
when :between?
@args.length == 2 || argument_error!("`between?' expects 2 arguments")
when :<, :<=, :==, :>, :>=
@args.length == 1 || argument_error!("`#{method}' expects 1 argument")
else
argument_error! "Unknown method `#{method}'"
end
end
def ===(other)
other.send(@method, *@args)
end
alias_method :match, :===
def to_s
if @method == :between?
@args.join('..')
else
"#{@method} #{@args.first}"
end
end
private
def argument_error!(message)
fail ArgumentError, message
end
end
end
end
Version data entries
29 entries across 29 versions & 3 rubygems