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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


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

Replace a with b

Replace a with inputed text

Replace a with b and output c

Replace a with inputed text print c

This will define the data string


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

    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]

d::=e~~~You replaced d with e!
f::=:::~~~You replaced f with the string you typed!
g::=~::Add your input?

Hello World!

b::= World

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.