Class: SafeType::Rule

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(r) ⇒ Rule

Returns a new instance of Rule.

Raises:

  • (ArgumentError) 


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# File 'lib/safe_type.rb', line 83

def initialize(r)
  raise ArgumentError, "SafeType::Rule has to be descried as a hash" \
    unless r.class == ::Hash
  raise ArgumentError, ":type key is required" \
    unless r.has_key?(:type)
  raise ArgumentError, ":type has to a class or module" \
    unless r[:type].class == ::Class || r[:type].class == ::Module
  @type = r[:type]
  @required = false
  @required = true if r.has_key?(:required) && r[:required]
  @has_default = r.has_key?(:default)
  @default = r[:default]
  @before = r[:before]
  @after = r[:after]
  @validate = r[:validate]
end

Instance Attribute Details

#after ⇒ Object (readonly)

Returns the value of attribute after.



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# File 'lib/safe_type.rb', line 82

def after
  @after
end

#before ⇒ Object (readonly)

Returns the value of attribute before.



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# File 'lib/safe_type.rb', line 82

def before
  @before
end

#default ⇒ Object (readonly)

Returns the value of attribute default.



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# File 'lib/safe_type.rb', line 82

def default
  @default
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/safe_type.rb', line 82

def type
  @type
end

#validate ⇒ Object (readonly)

Returns the value of attribute validate.



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# File 'lib/safe_type.rb', line 82

def validate
  @validate
end

Instance Method Details

#apply(input) ⇒ Object

Raises:



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# File 'lib/safe_type.rb', line 104

def apply(input)
  input = @before[input] unless @before.nil?
  begin
    result = Converter.to_type(input, @type) \
      if @validate.nil? || (!@validate.nil? && @validate[input])
  rescue
    return @default if @has_default
    return nil unless @required
  end
  result = @after[result] unless @after.nil?
  raise CoercionError if result.nil? && @required
  return @default if result.nil?
  result
end

#has_default? ⇒ Boolean

Returns:



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# File 'lib/safe_type.rb', line 102

def has_default?; @has_default; end

#required? ⇒ Boolean

Returns:



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# File 'lib/safe_type.rb', line 100

def required?; @required; end