Class: Romanesco::ExpressionState

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

Direct Known Subclasses

StateOne, StateThree, StateTwo, StateZero

Class Method Summary collapse

Class Method Details

.finish_here ⇒ Object 



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# File 'lib/romanesco/state_machine.rb', line 14

def finish_here
  @finishing_state = true
end

.next_state(token) ⇒ Object

Raises:



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# File 'lib/romanesco/state_machine.rb', line 8

def next_state(token)
  state = @states[token.state_machine_class]
  return state if state
  raise InvalidExpressionError
end

.transition(tree, tokens) ⇒ Object 



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# File 'lib/romanesco/state_machine.rb', line 22

def transition(tree, tokens)
  if tokens.empty?
    return tree if @finishing_state
    raise InvalidExpressionError
  end
  current_token = tokens.shift
  tree.add(current_token.element.new(current_token.expression_part)) unless current_token.is_a? CloseParenthesisToken
  tree.close_parenthesis if current_token.is_a? CloseParenthesisToken
  next_state = next_state(current_token)
  classify(next_state).transition(tree, tokens)
end

.transitions(value) ⇒ Object 



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# File 'lib/romanesco/state_machine.rb', line 18

def transitions(value)
  @states = value
end