From 693130cae9bdb145af79ee2eb256b661003b6e45 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Wed, 11 Dec 2019 21:53:12 +0000
Subject: Wrote Intcode (dis-)assembler

---
 intcode/das | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100755 intcode/das

(limited to 'intcode/das')

diff --git a/intcode/das b/intcode/das
new file mode 100755
index 0000000..c84d9a0
--- /dev/null
+++ b/intcode/das
@@ -0,0 +1,77 @@
+#!/usr/bin/env ruby
+
+class Program
+  def initialize(program)
+    @mem = program
+    @pc = 0
+  end
+
+  def dis_next
+    opcode = @mem[@pc] % 100
+
+    p3, p2, p1 = ("%03d" % (@mem[@pc] / 100)).chars
+
+    print "#{@pc}: "
+    case opcode
+    when 1
+      puts "add #{Program.sigil(p1)}#{@mem[@pc+1]}, #{Program.sigil(p2)}#{@mem[@pc+2]}, #{Program.sigil(p3)}#{@mem[@pc+3]}"
+      @pc += 4
+    when 2
+      puts "mul #{Program.sigil(p1)}#{@mem[@pc+1]}, #{Program.sigil(p2)}#{@mem[@pc+2]}, #{Program.sigil(p3)}#{@mem[@pc+3]}"
+      @pc += 4
+    when 3
+      puts "inp #{Program.sigil(p1)}#{@mem[@pc+1]}"
+      @pc += 2
+    when 4
+      puts "out #{Program.sigil(p1)}#{@mem[@pc+1]}"
+      @pc += 2
+    when 5
+      puts "jnz #{Program.sigil(p1)}#{@mem[@pc+1]}, #{Program.sigil(p2)}#{@mem[@pc+2]}"
+      @pc += 3
+    when 6
+      puts "jez #{Program.sigil(p1)}#{@mem[@pc+1]}, #{Program.sigil(p2)}#{@mem[@pc+2]}"
+      @pc += 3
+    when 7
+      puts "tlt #{Program.sigil(p1)}#{@mem[@pc+1]}, #{Program.sigil(p2)}#{@mem[@pc+2]}, #{Program.sigil(p3)}#{@mem[@pc+3]}"
+      @pc += 4
+    when 8
+      puts "teq #{Program.sigil(p1)}#{@mem[@pc+1]}, #{Program.sigil(p2)}#{@mem[@pc+2]}, #{Program.sigil(p3)}#{@mem[@pc+3]}"
+      @pc += 4
+    when 9
+      puts "arb #{Program.sigil(p1)}#{@mem[@pc+1]}"
+      @pc += 2
+    when 99
+      puts "hlt"
+      @pc += 1
+    else
+      puts "@dat #{@mem[@pc]}"
+      @pc += 1
+    end
+  end
+
+  def dis_all
+    until @pc >= @mem.length do
+      dis_next
+    end
+  end
+
+  private
+
+  def self.sigil(p)
+    case p
+    when "0"
+      "@"
+    when "2"
+      "&"
+    end
+  end
+end
+
+exit 1 if ARGV.length != 1
+
+source = ARGV.shift.strip
+
+input = File.readlines(source)[0].strip.split(",").map(&:to_i)
+
+p = Program.new(input)
+p.dis_all
-- 
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