Class: Declarative::Variables

Inherits:
Object
  • Object
show all
Defined in:
lib/declarative/variables.rb

Overview

Implements the pattern of maintaining a hash of key/values (usually “defaults”) that are mutated several times by user and library code (override defaults).

The Variables instance then represents the configuration data to be processed by the using library (e.g. Representable or Trailblazer).

Defined Under Namespace

Classes: Proc

Class Method Summary collapse

Class Method Details

.Append(appended_array) ⇒ Object 



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# File 'lib/declarative/variables.rb', line 32

def self.Append(appended_array)
  Variables::Proc.new do |original|
    (original || []) + appended_array
  end
end

.Merge(merged_hash) ⇒ Object 



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# File 'lib/declarative/variables.rb', line 26

def self.Merge(merged_hash)
  Variables::Proc.new do |original|
    (original || {}).merge( merged_hash )
  end
end

.merge(defaults, overrides) ⇒ Object

Returns Hash hash where ‘overrides` is merged onto `defaults` respecting Merge, Append etc.

Returns:

  • Hash hash where ‘overrides` is merged onto `defaults` respecting Merge, Append etc.



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# File 'lib/declarative/variables.rb', line 12

def self.merge(defaults, overrides)
  defaults = defaults.merge({}) # todo: use our DeepDup. # TODO: or how could we provide immutability?

  overrides.each do |k, v|
    if v.is_a?(Variables::Proc)
      defaults[k] = v.( defaults[k] )
    else
      defaults[k] = v
    end
  end

  defaults
end