Pattern

Pattern is an esolang created by User:A that is inspired by English grammar word describers.

Describers

x after y indicates that the following syntax must be fullfilled: The active item is y, and it is moving left towards x. This stops when y is right after the atom x.

x also y means that both x and y needs to be fullfilled. If trying to do both fails, only x is fullfilled.

x before y means that the active item was y, and it is moving right towards x. This stops when y is right before x.

no x means that execute x until the syntax is not fullfilled anymore.

x with y means that y needs to be right before OR right after the atom x. y is moving left.

Example

2 with 1
3 after 2
1 with 3

Note that instructions in Pattern execute cyclically. Given an input 312 this does:

          312
2 w/ 1 -> *nothing*
3 a. 2 -> 123
1 w/ 3 -> 132
2 w/ 1 -> 321
3 a. 2 -> 213 -> 231
1 w/ 3 -> *nothing*

and so on...