Class: Zaid::LexerComponents::Compressor

Inherits:
Object
  • Object
show all
Includes:
Keywords
Defined in:
lib/zaid/lexer_components/compressor.rb

Constant Summary

Constants included from Keywords

Keywords::AND, Keywords::CLASS, Keywords::DIVIDE, Keywords::ELSE, Keywords::EQUALS, Keywords::FALSE, Keywords::GREATER, Keywords::IF, Keywords::IS, Keywords::IT_IS, Keywords::LESS, Keywords::METHOD, Keywords::MINUS, Keywords::NIL, Keywords::NOT, Keywords::OR, Keywords::PLUS, Keywords::RECEIVE, Keywords::THAN, Keywords::THEN, Keywords::TIMES, Keywords::TRUE, Keywords::WAS, Keywords::WHILE

Instance Method Summary collapse

Instance Method Details

#compress(tokens) ⇒ Object 



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# File 'lib/zaid/lexer_components/compressor.rb', line 10

def compress(tokens)
  compressed = []
  between_receive_and_then = false

  compression_position = 0
  while compression_position < tokens.length
    case tokens[compression_position]
    when [:RECEIVE, RECEIVE]
      between_receive_and_then = true

      compressed << tokens[compression_position]

      compression_position += 1
    when [:THEN, THEN]
      between_receive_and_then = false

      compressed << tokens[compression_position]

      compression_position += 1
    when [:IF, IF]
      compression_position += compress_if(tokens, compressed, compression_position)
    when [:WHILE, WHILE]
      compression_position += compress_while(tokens, compressed, compression_position)
    when [:GREATER, GREATER]
      compression_position += compress_greater_than_or_equals(tokens, compressed, compression_position)
    when [:LESS, LESS]
      compression_position += compress_less_than_or_equals(tokens, compressed, compression_position)
    when [:EQUALS, EQUALS]
      compression_position += compress_equals(compressed)
    when [:NOT, NOT]
      compression_position += compress_not_equals(tokens, compressed, compression_position)
    when [:OR, OR]
      compression_position += compress_or(compressed)
    when [:AND, AND]
      compression_position += compress_and(tokens, compressed, compression_position, between_receive_and_then)
    when [:PLUS, PLUS], [:MINUS, MINUS], [:TIMES, TIMES], [:DIVIDE, DIVIDE]
      compression_position += compress_arabic_arithmetic_operator(tokens[compression_position], compressed)
    else
      compressed << tokens[compression_position]

      compression_position += 1
    end
  end

  compressed
end