Phi

Phi, or Φ, is an Esolang designed by PSTF.

It is a Brainfuck derivative.

Data storage

The program memory is composed of a theoretically infinite number of cells, that each store a single integer datum, in the range of Z.

At any instant in the program, a pointer marks the activated cell. The memory is normally infinite long(or expandable), but 1,000,000 cells when Restricted or Folded.

There are a dialect that every cell can be only in the range of [0, 65536), which we call it Restricted variant. Also, Restricted variant have a variant that wraps at the limit value, which calls Folded variant.

Syntax

Command Table

CMD	Things is do
+	Increase the activated cell by 1.
\	Increase the activated cell by 16.
»	Increase the activated cell by 256.
-	Decrease the activated cell by 1.
/	Decrease the activated cell by 16.
«	Decrease the activated cell by 256.
>	Inactivates the current cell and activates the cell to its right. In other words, point the pointer to a cell to the right.
<	Inactivates the current cell and activates the cell to its left. In other words, point the pointer to a cell to the left.
.	Output cell as ASCII character.
:	Output cell as a number.
[	Go to corresponding ] if value in stomach is 0.
]	Go to corresponding [ if value in stomach isn't 0.
(	Start a comment.
)	End a comment.
,	Get input as a character.
;	Get input as a number.
#	Quit program immediately.

Thus every Brainfuck program also work in Phi.

Examples

A+B Problem

;>;[-<+>]<:

Bad

,>,[-<+>]<.

Hello, World!

+++++++++++[>++++++>+++++++++>++++++++>++++>+++>+<<<<<<-]>++++++.>++.+++++++..+++.>>.>-.<<-.<.+++.------.--------.>>>+.>-.

Truth machine

;[:]:

Cat program(EOF returns 0)

,[.,]

Error

It's definitely about dealing with errors: when an error is encountered, it outputs a piece of information and then stops.

Memory error

These only work in Restricted variant.

Negative value in any cell:

[Error 1] The value inside the cell must be a natural number that less than 65536.
The program failed to execute.

Value above/equal 65536 in any cell:

[Error 1] The value inside the cell must be a natural number that less than 65536.
The program failed to execute.

Syntax error

Unmatched brackets:

[Error 2] Failed to find matching square brackets.
Compilation failed.

A comment block appears that is not closed:

[Error 3] The comment block must be completely closed.
Compilation failed.

Nothing was entered, or an EOF was entered (if it was not disposed of):

[Error 5] Failed to get the correct input.
The next code won't be executed.

Stack overflow:

[Error 8] Stack overflow.
The program failed to execute.

Miscallenous

Runtime error:

[Error 114514] Runtime error.
The next code won't be executed.

Memory was out:

[Error 1919810] There is not enough memory for code execution.
The program failed to execute.

Internal system error:

[Error -1] ?̨̥͖̪̙͍̞̉͒̾̓̈̌̍͆́͜?̺̦̟͍̖̫̮̖͛̒̓̐̄̿̇̄?̢̨̡̛͎̯̑͌̎̃̉͐͝ͅ?̢̪̭̫̝̠̤̆̋̂̔̍͐̽̔͒?̫͔̫͙͒̌̌̆̂̐̈́͟?̸͙̱͍͖͖̽̾̀͛͐?̸̧͓͔͚̩̎́̄̐̔̏̚?̢̟̫͎͚͕̙̎͌̉̇͑͋̍̑̐͒ͅͅ?̴̢̡̢̱͈͍̗̬̈̿͑̿̐̓͋͒̚͝ͅ?̞̠͖̦̜̩̳̂́̂̀̃͌
Compilation failed.

Successfully runned the program:

[Error 0] Program exits normally and properly.
Successfully runned the program.

Interpreters

Just modify on BAIMS's interpreter.