Class: Resyma::Core::AutomatonBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/resyma/core/automaton/builder.rb

Defined Under Namespace

Classes: NoStartError

Instance Method Summary collapse

Constructor Details

#initialize ⇒ AutomatonBuilder

Returns a new instance of AutomatonBuilder.



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# File 'lib/resyma/core/automaton/builder.rb', line 11

def initialize
  @next_id = 0
  @start = nil
  @accept_set = Set[]
  @transition_table = TransitionTable.new
end

Instance Method Details

#accept!(state) ⇒ nil

Add a state to the accept set of the automaton

Parameters:

Returns:

  • (nil) —

    Nothing



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# File 'lib/resyma/core/automaton/builder.rb', line 63

def accept!(state)
  @accept_set.add(state)
  nil
end

#add_transition!(from_state, matchable, to_state) ⇒ nil

Adds a new transition to the automaton

Parameters:

Returns:

  • (nil) —

    Nothing



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# File 'lib/resyma/core/automaton/builder.rb', line 40

def add_transition!(from_state, matchable, to_state)
  @transition_table.add_transition!(from_state, matchable, to_state)
end

#build ⇒ Object 



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# File 'lib/resyma/core/automaton/builder.rb', line 68

def build
  if @start.nil?
    raise NoStartError,
          "Cannot build a automaton without a start state"
  end

  Automaton.new(@start, @accept_set, @transition_table)
end

#new_state!(start: false, accept: false) ⇒ Resyma::Core::State

Adds a new state to the automaton and returns it

Returns:



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# File 'lib/resyma/core/automaton/builder.rb', line 23

def new_state!(start: false, accept: false)
  inst = State.with_id(@next_id)
  @next_id += 1
  start! inst if start
  accept! inst if accept
  inst
end

#start!(state) ⇒ nil

Specify a starting state for the automaton

Parameters:

Returns:

  • (nil) —

    Nothing



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# File 'lib/resyma/core/automaton/builder.rb', line 51

def start!(state)
  @start = state
  nil
end