Class: Plumb::Metadata

Inherits:
Object
  • Object
show all
Includes:
Composable
Defined in:
lib/plumb/metadata.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Composable

#&, #/, #>>, #[], #absorb_input, #absorb_output, #accepted_type, #as_node, #build, #check, #children, #defer, #fusable_step?, #fuse_with, #generate, #idempotent?, included, #invalid, #invoke, #match, #not, #pipeline, #policy, resolve_operand, #static, #subtype_identity, #to_json_schema, #to_mermaid, #to_plumb_type, #to_s, #transform, #value, #value_preserving?, #where, #with, wrap, #|

Methods included from Callable

#parse, #resolve

Constructor Details

#initialize(type, metadata) ⇒ Metadata

Returns a new instance of Metadata.



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# File 'lib/plumb/metadata.rb', line 9

def initialize(type, metadata)
  @type = type
  @metadata = type.metadata.merge(metadata)
  freeze
end

Instance Attribute Details

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/plumb/metadata.rb', line 7

def type
  @type
end

Instance Method Details

#==(other) ⇒ Boolean

Metadata nodes include their wrapped type in equality; otherwise unrelated types carrying the same metadata could collapse during subtype reductions.

Parameters:

  • other (Object)

Returns:

  • (Boolean) 


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# File 'lib/plumb/metadata.rb', line 19

def ==(other)
  other.instance_of?(self.class) && type == other.type && @metadata == other.metadata
end

#call(result) ⇒ Object 



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# File 'lib/plumb/metadata.rb', line 36

def call(result) = type.call(result)

#input_type ⇒ Object

Metadata is a transparent wrapper: it delegates type-flow to the wrapped type.



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# File 'lib/plumb/metadata.rb', line 33

def input_type = type.input_type

#metadata(data = Undefined) ⇒ Object 



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# File 'lib/plumb/metadata.rb', line 23

def metadata(data = Undefined)
  if data == Undefined
    @metadata
  else
    Metadata.new(@type, @metadata.merge(data))
  end
end

#output_type ⇒ Object 



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# File 'lib/plumb/metadata.rb', line 34

def output_type = type.output_type