Class: Assembler::Instructions::CommandInstruction

Inherits:
Object
  • Object
show all
Defined in:
lib/hackasm/assembler/instructions/command_instruction.rb

Constant Summary collapse

JUMPS_TABLE = 
[nil, *JUMPS].zip(
  (0..8).map { |i| i.to_s(2).rjust(3, "0") }
).to_h.freeze
DESTS_TABLE = 
[nil, *DESTS].zip(
  (0..8).map { |i| i.to_s(2).rjust(3, "0") }
).to_h.freeze
COMPS_TABLE = 
{
  "0"   => "0101010",
  "1"   => "0111111",
  "-1"  => "0111010",
  "D"   => "0001100",
  "A"   => "0110000",
  "!D"  => "0001101",
  "!A"  => "0110001",
  "-D"  => "0001111",
  "-A"  => "0110011",
  "D+1" => "0011111",
  "A+1" => "0110111",
  "D-1" => "0001110",
  "A-1" => "0110010",
  "D+A" => "0000010",
  "D-A" => "0010011",
  "A-D" => "0000111",
  "D&A" => "0000000",
  "D|A" => "0010101",
  "M"   => "1110000",
  "!M"  => "1110001",
  "-M"  => "1110011",
  "M+1" => "1110111",
  "M-1" => "1110010",
  "D+M" => "1000010",
  "D-M" => "1010011",
  "M-D" => "1000111",
  "D&M" => "1000000",
  "D|M" => "1010101",
}

Instance Method Summary collapse

Constructor Details

#initialize(instruction) ⇒ CommandInstruction

Returns a new instance of CommandInstruction.



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# File 'lib/hackasm/assembler/instructions/command_instruction.rb', line 44

def initialize(instruction)
  @instruction = instruction
end

Instance Method Details

#to_b ⇒ Object 



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# File 'lib/hackasm/assembler/instructions/command_instruction.rb', line 48

def to_b
  comp_bits = COMPS_TABLE[comp]

  binary_instruction = "111"
  binary_instruction << COMPS_TABLE[comp]
  binary_instruction << DESTS_TABLE[dest]
  binary_instruction << JUMPS_TABLE[jump]

  binary_instruction
rescue
  binding.pry
end