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Contents
module Alf
module Types
class Selector
extend Domain::Reuse.new(Object)
coercions do |c|
c.coercion(Symbol){|v,_|
Selector.new(AttrName.coerce(v))
}
c.coercion(String){|v,_|
v =~ /\./ ? c.coerce(v.split('.')) : c.coerce(v.to_sym)
}
c.coercion(Array){|v,_|
Selector.new(v.map{|v| AttrName.coerce(v) })
}
end
def simple?
reused_instance.is_a?(Symbol)
end
def composite?
!simple?
end
def outcoerce
reused_instance
end
def select(tuple)
return tuple[reused_instance] unless reused_instance.is_a?(Array)
reused_instance.inject(tuple){|t,a| t && t[a] }
end
def dive(attr)
components = to_a
return nil unless (components.first == attr) && components.size > 1
rest = components[1..-1]
Selector.new(rest.size == 1 ? rest.first : rest)
end
def to_a
Array(reused_instance)
end
def to_lispy
Support.to_ruby_literal(reused_instance)
end
def to_ruby_literal
"Alf::Selector[#{Support.to_ruby_literal(reused_instance)}]"
end
alias :to_s :to_ruby_literal
alias :inspect :to_ruby_literal
end # class Selector
end # module Types
end # module Alf
Version data entries
6 entries across 6 versions & 1 rubygems