Class: Peggy::Optional

Inherits:

Multiple

• Object
• Element
• Multiple
• Peggy::Optional

Defined in:

lib/parse/builder.rb

Overview

Matcher of 0 or 1 time.

Constant Summary

Constants inherited from Multiple

Multiple::MANY

Instance Attribute Summary

Attributes inherited from Multiple

#range

Attributes included from OneChild

#child

Instance Method Summary

• #initialize ⇒ Optional constructor

  A new instance of Optional.

• #to_s ⇒ Object

  Convert element to String.

Methods inherited from Multiple

#match

Methods included from OneChild

#wrap

Methods inherited from Element

build, #match, #report

Constructor Details

#initialize ⇒ Optional

Returns a new instance of Optional.

# File 'lib/parse/builder.rb', line 174

def initialize
  super 0..1
end

Instance Method Details

#to_s ⇒ Object

Convert element to String.

# File 'lib/parse/builder.rb', line 179

def to_s
  "#{wrap}?"
end