lookup_table.rb

TABLE_C_A0 = {
  '0'   => 0b101010,
  '1'   => 0b111111,
  '-1'  => 0b111010,
  'D'   => 0b001100,
  'A'   => 0b110000,
  '!D'  => 0b001101,
  '!A'  => 0b110001,
  '-D'  => 0b001111,
  '-A'  => 0b110011,
  'D+1' => 0b011111,
  'A+1' => 0b110111,
  'D-1' => 0b001110,
  'A-1' => 0b110010,
  'D+A' => 0b000010,
  'D-A' => 0b010011,
  'A-D' => 0b000111,
  'D&A' => 0b000000,
  'D|A' => 0b010101
}

TABLE_C_A1 = {
  'M'   => 0b110000,
  '!M'  => 0b110001,
  '-M'  => 0b110011,
  'M+1' => 0b110111,
  'M-1' => 0b110010,
  'D+M' => 0b000010,
  'M+D' => 0b000010,
  'D-M' => 0b010011,
  'M-D' => 0b000111,
  'D&M' => 0b000000,
  'D|M' => 0b010101
}

TABLE_D = {
  nil   => 0b000,
  'M'   => 0b001,
  'D'   => 0b010,
  'MD'  => 0b011,
  'A'   => 0b100,
  'AM'  => 0b101,
  'AD'  => 0b110,
  'AMD' => 0b111
}

TABLE_J = {
  nil   => 0b000,
  'JGT' => 0b001,
  'JEQ' => 0b010,
  'JGE' => 0b011,
  'JLT' => 0b100,
  'JNE' => 0b101,
  'JLE' => 0b110,
  'JMP' => 0b111
}

TABLE_P = {
  'SCREEN'  => 0x4000,
  'KBD'     => 0x6000,
  'SP'      => 0,
  'LCL'     => 1,
  'ARG'     => 2,
  'THIS'    => 3,
  'THAT'    => 4
}