Twoee

Twoee

Paradigm(s)	String-rewriting paradigm
Designed by	Matthew Cooke,Thomas Burnip
Appeared in	2018
Dimensions	one-dimensional
Computational class	Turing complete
Major implementations	Python Interpreter
Influenced by	Thue
File extension(s)	.t2

Twoee because Thue isn't bad enough. This is not 100% backwards compatible. We have "improved" it.

Design Aims

Implemented

This is a comment (any text without an operator)
Yes twoee has comments

Replace a with b
a::=b

Replace a with inputed text
a::=:::

Replace a with b and output c
a::=b~~~c

Replace a with inputed text print c
a::=:::~~~c

This will define the data string
;;=a

Unimplemented

Proper implementation of literal and non literal operators
i.e. not have such a hacky fix for making ~~~ run after :::

Operator list

All possible operators

Definition Operators

    This defines a command
    ::=

    This defines the data string
    ;;=

Control Operator

    This tells the interpreter to take an input from the user
    :::

    Prompted input
    ~::Prompt

    This outputs the text following it (text is treated as a literal)
    ~~~

Example Code

This proves that our design aims have been met

This is the exmaple Twoee File.
It should output:

[whatever you typed first]
You replaced d with e!
[what ever you typed second]
You replaced f with the string you typed!
[What ever you typed]
b[whatever you typed second]e[whatever you typed second][you final input]

a::=b
c::=:::
d::=e~~~You replaced d with e!
f::=:::~~~You replaced f with the string you typed!
g::=~::Add your input?
;;=acdfg

Hello World!

a::=Hello
b::= World
;;=ab

Some notes on execution

This does not chose a random possible substitution and run it, instead it will always run the first possible substitution. Therefore the order they are defined in will set their precedence.

There are a few structural changes to how files are laid out as well compared to Thue. For example the data string is no longer defined as whatever comes after a line with only ::= on it but as whatever follows the ;;= operator. All operators are 3 characters long.

Road Map

• Add file input and output
• Have a single variable that is equal to the data string

External resources

A Python interpreter is available on GitHub.