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Refactor State#xxx_transitions #395

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merged 1 commit into from
Apr 13, 2024
Merged

Refactor State#xxx_transitions #395

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28 changes: 3 additions & 25 deletions lib/lrama/state.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -70,38 +70,16 @@ def set_look_ahead(rule, look_ahead)
reduce.look_ahead = look_ahead
end

# Returns array of [Shift, next_state]
def nterm_transitions
return @nterm_transitions if @nterm_transitions

@nterm_transitions = []

shifts.each do |shift|
next if shift.next_sym.term?

@nterm_transitions << [shift, @items_to_state[shift.next_items]]
end

@nterm_transitions
@nterm_transitions ||= transitions.select {|shift, _| shift.next_sym.nterm? }
end

# Returns array of [Shift, next_state]
def term_transitions
return @term_transitions if @term_transitions

@term_transitions = []

shifts.each do |shift|
next if shift.next_sym.nterm?

@term_transitions << [shift, @items_to_state[shift.next_items]]
end

@term_transitions
@term_transitions ||= transitions.select {|shift, _| shift.next_sym.term? }
end

def transitions
term_transitions + nterm_transitions
@transitions ||= shifts.map {|shift| [shift, @items_to_state[shift.next_items]] }
end

def selected_term_transitions
Expand Down