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module Finitio
#
# The Seq type generator allows capturing sequences of values. For example,
# a (implicitely temporal) series of temperature measures could be written
# as:
#
# Measures = [Temperature]
#
# This class allows capturing those sequence types, e.g.:
#
# Temperature = BuiltinType.new(Float)
# Measures = SeqType.new(Temperature)
#
# An array of values is used as concrete representation for such sequences:
#
# R(Measures) = Array[R(Temperature)] = Array[Float]
#
# Accordingly, the `dress` transformation function has the signature below.
# It expects it's Alpha/Object argument to be a object responding to
# `each` (with the ruby idiomatic semantics that such a `each` returns
# an Enumerator when invoked without block).
#
# dress :: Alpha -> Measures throws TypeError
# dress :: Object -> Array[Float] throws TypeError
#
class SeqType < Type
include CollectionType
def representator
[elm_type]
end
def include?(value)
value.is_a?(::Array) and value.all?{|v| elm_type.include?(v) }
end
# Apply the element type's `dress` transformation to each element of
# `value` (expected to respond to `each`). Return converted values in a
# ruby Array.
def dress(value, handler = DressHelper.new)
handler.failed!(self, value) unless value.respond_to?(:each)
array = []
handler.iterate(value) do |elm, index|
array << elm_type.dress(elm, handler)
end
array
end
def default_name
"[#{elm_type.name}]"
end
end # class SeqType
end # module Finitio
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