Module: Inform::Prototypical

Included in:
Object, System::Object
Defined in:
lib/runtime/prototype.rb

Overview

The Inform::Prototypical module

Constant Summary collapse

MethodWriterTemplate = 
'%<method_name>s='.freeze
VariableTemplate = 
'@%<property>s'.freeze
MethodBooleanOrBangPattern = 
%r{([\?!]+)$}.freeze
MethodWriterPattern = 
%r{=$}.freeze
LinkPattern = 
%r{.+_to$}.freeze
AccessorMethodTemplate = 
%(
def %<accessor>s(*args)
  args.empty? ? self._get(__method__) : self._set(__method__, *args)
end
).freeze
WriterMethodTemplate = 
%(
def %<writer>s(value)
  self._assign(__method__.to_s.chop.to_sym, value)
end
).freeze
MISSING_PROPERTIES_MESSAGE =

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'Missing properties attribute for: ' \
'%<identity>s'.freeze

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object

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# File 'lib/runtime/prototype.rb', line 133

def method_missing(method, *args, &block)
  return super if method == :to_ary
  m = method.to_s
  return super if MethodBooleanOrBangPattern.match?(m)
  mname = MethodWriterPattern.match?(m) ? m.chop : m
  property = mname.to_sym
  variable = format(VariableTemplate, property: property).to_sym
  event = context_event

  if MethodWriterPattern.match?(m) || (LinkPattern.match?(m) && !args.empty?)
    if !event.nil? && Inform::Runtime.invocation_properties.include?(property)
      event.send(method, *args, &block)
    elsif inflib&.library_method?(method)
      inflib.send(method, *args, &block)
    else
      self.prototype(method, *args, &block)
    end
  elsif !event.nil? && Inform::Runtime.invocation_properties.include?(property)
    result = event.send(method, *args, &block)
    log.debug("Value for event #{event}.#{method} is: #{result || 'nil'}") if defined? DEBUG
    result
  elsif inflib&.library_method?(method)
    inflib.send(method, *args, &block)
  elsif inflib.respond_to?(method) && Inform::Runtime.invocation_properties.include?(property)
    inflib.send(method, *args, &block)
  elsif inflib&.instance_variable_get(variable) || inflib&.instance_variables&.include?(variable)
    inflib.instance_variable_get(variable)
  elsif (properties.respond_to?(:key?) && properties.key?(property)) ||
      (respond_to?(:_key?) && _key?(property)) ||
      !args.empty?
    self.prototype(method, *args, &block)
  else
    super
  end
end

Instance Method Details

#&(property, *args) ⇒ Object

This method tries to access or write values given by *args to the property using an accessor or writer method, and failing that, will invoke the prototype method, which dynamically defines an accessor or writer method on the receiver for future ease of access. rubocop: disable Metrics/AbcSize rubocop: disable Metrics/BlockNesting rubocop: disable Metrics/CyclomaticComplexity rubocop: disable Metrics/MethodLength rubocop: disable Metrics/PerceivedComplexity



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# File 'lib/runtime/prototype.rb', line 60

def &(property, *args)
  return nil if property.nil?
  return super unless property.is_a?(Symbol) || property.is_a?(String)
  return nil if property.respond_to?(:empty?) && property.empty?
  property, sub_property = property.to_s.split('.').map(&:to_sym)
  if !args.empty?
    setter = format(MethodWriterTemplate, method_name: property)
    if !sub_property.nil?
      value = self.send(property)
      if value.object?
        value.&(sub_property, *args)
      elsif value.respond_to?(:key?)
        value[sub_property] = (args.length > 1 ? args : args.first)
        self.send(setter, value)
      else
        self.send(setter, *args)
      end
    elsif self.respond_to?(property) && args.length == self.method(property).arity
      self.send(property, *args)
    elsif self.respond_to?(setter) && args.length == self.method(setter).arity
      self.send(setter, *args)
    elsif !Kernel.methods.include?(property)
      self.send(property, *args)
    else
      self.prototype(property, *args)
    end
  elsif !sub_property.nil?
    value = self.send(property)
    if value.object?
      value.&(sub_property, *args)
    elsif value.respond_to?(property)
      value.send(property)
    elsif value.respond_to?(:key?)
      value[sub_property]
    else
      value
    end
  elsif self.respond_to?(property)
    self.send(property)
  elsif (self.properties.respond_to?(:key?) && self.properties.key?(property)) ||
      (self.respond_to?(:_key?) && self._key?(property))
    self.prototype(property)
  else
    return nil
  end
end

#_assign(key, value) ⇒ Object

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# File 'lib/runtime/prototype.rb', line 282

def _assign(key, value)
  raise "The key parameter must be a symbol" unless key.is_a? Symbol
  result = nil
  if value.object?
    result = self._set_object(key, value) if self.respond_to?(:_set_object)
  elsif value.nil? && self.respond_to?(:_key?) && self._key?(key)
    result = self._unset_object(key) if self.respond_to?(:_unset_object)
  elsif value.nil? && self.properties.key?(key)
    self.will_change_column(:properties) if self.respond_to?(:will_change_column)
    self.properties.delete(key)
    self.save_changes if self.respond_to?(:save_changes)
  else
    self.will_change_column(:properties) if self.respond_to?(:will_change_column)
    self.properties[key] = value
    self.save_changes if self.respond_to?(:save_changes)
  end
  result || self.properties.dup[key]
end

#_get(key) ⇒ Object 



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# File 'lib/runtime/prototype.rb', line 238

def _get(key)
  result = nil
  result = self._get_object(key) if self.respond_to?(:_key?) && self._key?(key)
  result || self.properties.dup[key]
end

#_set(key, *values) ⇒ Object

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# File 'lib/runtime/prototype.rb', line 248

def _set(key, *values)
  raise "The key parameter must be a symbol" unless key.is_a? Symbol
  raise "The values parameter may not be empty" if values.empty?
  result = nil
  if values.first.object?
    result = self._set_object(key, values.first) if respond_to? :_set_object
  elsif values.first.nil? && self.respond_to?(:_key?) && self._key?(key)
    result = self._unset_object(key) if self.respond_to?(:_unset_object)
  elsif values.first.nil?
    self.will_change_column(:properties) if self.respond_to?(:will_change_column)
    self.properties.delete(key)
    self.save_changes if self.respond_to?(:save_changes)
  elsif values.length > 1
    self.will_change_column(:properties) if self.respond_to?(:will_change_column)
    self.properties[key] = []
    self.properties[key].concat(values)
    values.clear
    self.save_changes if self.respond_to?(:save_changes)
  else
    self.will_change_column(:properties) if self.respond_to?(:will_change_column)
    self.properties[key] = values.first
    self.save_changes if self.respond_to?(:save_changes)
  end
  result || self.properties.dup[key]
end

#accessor_and_writer(key) ⇒ Object

def respond_to_missing?(method, include_all=false)

m = method.to_s
return false if m =~ /\?$/
mname = m =~ /\=$/ ? m.chop : m
property = mname.intern
Inform::Runtime.invocation_properties.include? property

end



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# File 'lib/runtime/prototype.rb', line 182

def accessor_and_writer(key)
  return [key.to_s.chop, key] if MethodWriterPattern.match?(key)
  [key, format(MethodWriterTemplate, method_name: key)]
end

#context_event ⇒ Object 



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# File 'lib/runtime/prototype.rb', line 25

def context_event
  Thread.current[:event]
end

#ensure_properties_attribute! ⇒ Object

Raises:

  • (StandardError) 


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# File 'lib/runtime/prototype.rb', line 229

def ensure_properties_attribute!
  return unless self.properties.nil?
  raise StandardError, format(MISSING_PROPERTIES_MESSAGE, identity: self.identity)
end

#instance_variables_map ⇒ Object 



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# File 'lib/runtime/prototype.rb', line 29

def instance_variables_map
  instance_variables.each_with_object({}) do |key, memo|
    memo[key] = instance_variable_get(key)
  end
end

#key_refers_to_link?(key) ⇒ Boolean 



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# File 'lib/runtime/prototype.rb', line 234

def key_refers_to_link?(key)
  Inform::Library::DeclaredProperties.memo.key?(key) && LinkPattern.match?(key.to_s)
end

#prototype(key, *args, &block) ⇒ Object

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# File 'lib/runtime/prototype.rb', line 202

def prototype(key, *args, &block)
  ensure_properties_attribute!
  accessor, writer = accessor_and_writer(key)
  if key_refers_to_link?(key)
    self.will_change_column(:properties) if self.respond_to?(:will_change_column)
    if args.empty? && self.properties.key?(key)
      return if (to_obj = get_constant(self.properties[key])).nil? || !to_obj.object?
      self.link(key, to_obj)
      self.properties.delete(key)
      self.save_changes if self.respond_to?(:save_changes)
      return to_obj
    end
    self.properties[key] = args.first
  end
  accessor = format(AccessorMethodTemplate, accessor: accessor)
  self.instance_eval(accessor, __FILE__, __LINE__)
  writer = format(WriterMethodTemplate, writer: writer)
  self.instance_eval(writer, __FILE__, __LINE__)
  self.send(key, *args, &block)
end

#string?(key) ⇒ Boolean 



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# File 'lib/runtime/prototype.rb', line 42

def string?(key)
  v = self.&key
  return false if v.nil?
  v.respond_to?(:to_s) && !v.to_s.empty?
end

#values ⇒ Object 



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# File 'lib/runtime/prototype.rb', line 35

def values
  super || instance_variables_map
rescue StandardError => e
  log.warn "Unexpected error invoking super(Inform::Prototypical#values): #{e.message}"
  instance_variables_map
end

#|(property, *args) ⇒ Object

This method attempts to get a value if it exists. If no value is already set on the receiver, any given arguments will be set on the receiver for future access.



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# File 'lib/runtime/prototype.rb', line 115

def |(property, *args)
  return nil if property.nil?
  return super unless property.respond_to?(:to_s)
  return nil if property.to_s.empty?
  v = self.&property
  v || send(property, *args)
end