I use Arch btw language specification

Source code encoding

I use Arch btw source code is text encoded in ASCII.

Program resources

I use Arch btw programs are given the following resources:

• a working memory of 65,536 ($2^{16}$) 8-bit bytes,
• a pointer initialized to point to the first byte of working memory, referred to as the data pointer,
• an input file,
• an output file.

They can use these resources through commands represented in source code by keywords.

Comments

Source code can contain comments that will be ignored during lexical analysis. Comments start with the semicolon character (';') and stop at the end of the line.

Keywords

Programs are a sequence of commands represented in source code by the following keywords:

Keyword	Meaning
i	Increment the data pointer by 1. It is an execution error to do so when it points to the last byte of the working memory.
use	Decrement the data pointer by 1. It is an execution error to do so when it points to the first byte of the working memory.
arch	Increment the value pointed to by the data pointer by 1. If it was 255, then it becomes 0.
linux	Decrement the value pointed to by the data pointer by 1. If it was 0, then it becomes 255.
btw	Write the value pointed to by the data pointer as character to the output file.
by	Read a character from the input file into the value pointed to by the data pointer.
the	If the value pointed to by the data pointer is zero, then continue execution of the program after the matching way keyword.
way	If the value pointed to by the data pointer is not zero, then continue execution of the program after the matching the keyword.
gentoo	Call the debugging event handler.

Whitespace

Keywords are separated by whitespace, defined as a sequence of one or more of the following characters:

• horizontal tab ('\t'),
• new line ('\n'),
• carriage return ('\r'),
• space (' ').