Class: Egd::PgnParser

Inherits:
Object
  • Object
show all
Defined in:
lib/egd/pgn_parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pgn_content) ⇒ PgnParser

Returns a new instance of PgnParser.



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# File 'lib/egd/pgn_parser.rb', line 10

def initialize(pgn_content)
  @pgn_content = pgn_content
  @headers = []
  @movelist = []
  @game_attributes = {}
end

Instance Attribute Details

#headers ⇒ Object (readonly)

This service takes in a PGN string and parses it Returns the game tags (headers of the PGN file) and the actual moves made in SAN



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# File 'lib/egd/pgn_parser.rb', line 8

def headers
  @headers
end

#pgn_content ⇒ Object (readonly)

This service takes in a PGN string and parses it Returns the game tags (headers of the PGN file) and the actual moves made in SAN



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# File 'lib/egd/pgn_parser.rb', line 8

def pgn_content
  @pgn_content
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/egd/pgn_parser.rb', line 17

def call
  current_index = 0
  state = :initial
  buffer = ''

  while (current_index < @pgn_content.size)
    current_char = @pgn_content[current_index]
    current_index += 1

    if state == :initial
      if current_char == '['
        state = :start_parse_header
        next
      elsif (current_char == ' ' || current_char == "\n" || current_char == "\r")
        next
      else
        break
      end
    end

    if state == :start_parse_header
      if current_char == ']'
        state = :initial
        hd = parse_header(buffer)
        @headers << hd
        @game_attributes[hd[:type]] = hd[:value]
        buffer = ''
        next
      else
        buffer << current_char
        next
      end
    end
  end

  @movelist = simple_parse_moves

  hash = {moves: @movelist}
  hash.merge!(game_tags: @game_attributes) if @game_attributes.any?
  hash
end