Class: SelfML::AST::Node

Inherits:

Object

• Object
• SelfML::AST::Node

show all

Defined in:

lib/selfml/ast.rb

Instance Attribute Summary (collapse)

• - (Object) head

  Returns the value of attribute head.

• - (Object) tail

  Returns the value of attribute tail.

Instance Method Summary (collapse)

• - (Object) <=>(rhs)
• - (Node) initialize(head, tail = []) constructor

  A new instance of Node.

• - (Object) serialize(level = 1) (also: #to_s)

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# File 'lib/selfml/ast.rb', line 17

def initialize( head , tail = [] )
  @head , @tail = head , tail
end

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# File 'lib/selfml/ast.rb', line 15

def head
  @head
end

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# File 'lib/selfml/ast.rb', line 15

def tail
  @tail
end

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# File 'lib/selfml/ast.rb', line 38

def <=> rhs
  case rhs
  when Node
    0
  when StringNode
    1
  else
    -1
  end
end

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# File 'lib/selfml/ast.rb', line 21

def serialize level=1
  tail = @tail.sort.map do |t|
    case t
    when Node
      "\n" + " "*level*4 + "#{t.serialize level+1}"
    when StringNode
      " #{t.serialize}"
    else
      nil
    end
  end
  
  "(#{head.serialize}#{tail})"
end