Dhaka::LexerSupport::State

# File lib/dhaka/lexer/state.rb, line 6
def initialize(state_machine, action=nil)
  @state_machine      = state_machine
  @transitions        = {}
  @checkpoint_actions = []
  @action             = action
end

# File lib/dhaka/lexer/state.rb, line 33
def accept(pattern)
  @action = AcceptAction.new(pattern)
end

# File lib/dhaka/lexer/state.rb, line 37
def accept_with_lookahead(pattern)
  @action = LookaheadAcceptAction.new(pattern)
end

# File lib/dhaka/lexer/state.rb, line 13
def accepting?
  @action
end

# File lib/dhaka/lexer/state.rb, line 29
def add_checkpoint(pattern)
  checkpoint_actions << LexerSupport::CheckpointAction.new(pattern)
end

# File lib/dhaka/lexer/state.rb, line 45
def compile_to_ruby_source
  result  = "  at_state(#{object_id}) {\n"
  result << "    #{action.compile_to_ruby_source}\n" if action
  checkpoint_actions.each do |checkpoint_action|
    result << "    #{checkpoint_action.compile_to_ruby_source}\n"
  end
  transition_keys_by_destination_state = Hash.new {|hash, key| hash[key] = []}
  transitions.each do |key, dest_state|
    transition_keys_by_destination_state[dest_state.object_id] << key
  end

  transition_keys_by_destination_state.keys.each do |state_id|
    transition_keys = transition_keys_by_destination_state[state_id].collect {|transition_key| "#{transition_key.inspect}"}.join(', ')
    result << "    for_characters(#{transition_keys}) { switch_to #{state_id} }\n"
  end

  result << "  }"
  result
end

# File lib/dhaka/lexer/state.rb, line 22
def for_characters *characters, &blk
  dest_state = @state_machine.instance_eval(&blk)
  characters.each do |char|
    transitions[char] = dest_state
  end
end

# File lib/dhaka/lexer/state.rb, line 17
def process lexer_run
  checkpoint_actions.each {|action| action.call(lexer_run)}
  action.call(lexer_run) if accepting?
end

# File lib/dhaka/lexer/state.rb, line 41
def recognize pattern
  @pattern = pattern
end