tutorial

Alright, You decided to embark on the adventure of learning how to use scaffolding!

I couldn't be more sorry for You!

Introduction

I recommend opening the list of opcodes, You'll need it for reference.

In this tutorial I'll analyse and explain a couple of programs written in scaf.

Before that, let's lay down some fundamentals first:

The Read Head (blue) and the Write Head (red) both initially start at position (0, 0).
The Read Head advances automatically until it reaches an illegal position (outside the buffer).
Current Head points to the Write Head by default.
If You instruct the Write Head to go out of bounds, it will expand the buffer, so that it's position is always legal.

9y9+9xY.O. .D.U.D.E.

This short script does two things:

Positions the Write Head on the 9th line and 18 column:
1. Loads 9 into the Write Head's mod.
2. Executes opcode y.
3. Loads 9, then adds another 9 to mod.
4. Executes opcode x.
Loads 7 chars and prints them sequentially until it reaches the end of the buffer:
1. Loads a char into the Write Head's mod.
2. Executes opcode ..
3. Repeats that 7 times.

a.b.07<

This bane of a script will never terminate.

First loop:
1. Starts with loading and printing first a, then b.
2. Loads 0 (which is totally useless), then 7.
3. Executes opcode < whereby the whole buffer shifts.
Subsequent loops:
1. Loads b, then again b and prints it. The double b is a prominent example of the script overwriting the previous code.
2. Executes opcode < after loading in 0, then 7.