Class: UrlPlumber::Plumber

Inherits:
Object
  • Object
show all
Defined in:
lib/url_plumber/plumber.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params) ⇒ Plumber

Returns a new instance of Plumber.



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# File 'lib/url_plumber/plumber.rb', line 7

def initialize params
  @params = dup(params)
end

Instance Attribute Details

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/url_plumber/plumber.rb', line 5

def params
  @params
end

Instance Method Details

#extract(key_path) ⇒ Object 



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# File 'lib/url_plumber/plumber.rb', line 11

def extract key_path
  keys = key_path.to_s.split('.').map(&:to_sym)
  key = keys[-1]

  scope = params
  keys[0..-2].each do |part|
    scope = scope.fetch(part) { HashWithIndifferentAccess.new }
  end

  if scope.has_key?(key)
    scope[key]
  else
    nil
  end
end

#plumb(attributes = {}) ⇒ Object 



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# File 'lib/url_plumber/plumber.rb', line 27

def plumb attributes = {}
  scope = dup(params)
  attributes.each do |key, value|
    scope = update_scope scope, key, value
  end
  scope
end

#update_scope(scope, key_path, value = nil) ⇒ Object 



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# File 'lib/url_plumber/plumber.rb', line 35

def update_scope scope, key_path, value = nil
  keys = key_path.to_s.split('.').map(&:to_sym)
  key = keys[-1]

  scopes = []

  keys[0..-2].each do |part|
    scopes << scope
    scope = scope.fetch(part) { HashWithIndifferentAccess.new }
  end

  if value.nil?
    scope.delete key
  else
    scope[key] = value
  end

  keys[0..-2].reverse.each do |part|
    parent = scopes.pop
    parent[part] = scope
    scope = parent
  end

  scope
end