BrainFuck part 7 - Quine (+ some non-BF quine theory)

Data definition

Now, let's generate the data part. As explained, it's

• the whole source code, starting just after data definition
• and it should be encoded with successive '+' followed by '>' for each char

Not very optimal, but easy to write ;)

This is the part we want to encode

++++++++[->++++++++<]>--....[-]<<[<]<<++++++++[->+++++>++++++++<<]>+++>-->[[-<<<+>.>>]<.[->+<]<[->+<]>>>]<<<<[<]>[.>]

Let's write a BF tool that generates the data from any input

Let's start

• Memory: empty
• Cursor: first cell
• Input: some code to convert

Process

• Let's be smart and first generate 43 (+) and 62 (>)
• For each value in input
  • Print 43 as many times as needed
  • print 62
• Loop

Code

++++++++[->+++++>++++++++<<]>+++>--<<   Generate 43 and 62
,[                                      For each value in input
  [->.<]                                Print 43 as many times as needed
  >>.                                   print 62
<<,]                                    Loop

Minified version

++++++++[->+++++>++++++++<<]>+++>--<<,[[->.<]>>.<<,]

Final state

• Memory: 0, 43, 62
• Cursor: on first cell
• Input: empty (read)
• Output: our data definition bloc