FROM HERE TO THERE
FROM HERE TO THERE is an esolang by User:PythonshellDebugwindow.
Syntax
Lines can be separated by \n, \r\n, \n , \r\n , ;, ; , ;\n, or ;\r\n where \r is CR and \n is LF, but \n is used on this page for consistency. Each line has the following syntax:
FROM x TO y
x can be LINE, IN, a file, an integer, a string, or a variable, and y can be anything x can (minus IN) as well as OUT, ERR, and a variable expression (a binary math operator and its operands).
Values of y
| Value of y | Effect |
|---|---|
LINE |
Unconditionally jump to 0-indexed line x |
OUT |
Output x with a newline to STDOUT |
ERR |
Output x with a newline to STDERR |
| A file | Write x to file y without a newline |
| An integer | For every defined variable V: if V is equal to x, set it to y |
| A string | Same as if y is an integer |
| A variable | Set the variable named y to x (initialize it if necessary) |
| A variable expression | For LHS (OP) RHS, set the variable named LHS to its offset for x (please see #Variables) |
Special values of x
If x is equal to IN, then replace it with a line of user input read from STDIN as a string before executing the rest of the line. If it is equal to LINE, then replace it with the current 0-indexed line number.
Variables
FROM HERE TO THERE uses a reverse-operation notation to perform math on variables; standalone math is illegal. To create a variable myVar and set it to 20:
FROM 20 TO myVar
To increment it by n:
FROM myVar TO myVar - n
To decrement it by n:
FROM myVar TO myVar + n
To multiply it by n:
FROM myVar TO myVar / n
To divide it by n:
FROM myVar TO myVar * n
Literals
| Type | Example |
|---|---|
| File | <path/to/file.txt>
|
| Integer | 123
|
| String | "Hello, World!"
|
| Variable | myVar
|
BNF
<program> ::= <line> ( <endl> <line> )* <line> ::= "FROM" " "+ <from> " "+ "TO" " "+ <to> <from> ::= "LINE" | "IN" | <file> | <int> | <str> | <id> <to> ::= "LINE" | "OUT" | "ERR" | <file> | <int> | <str> | <id> | <varexpr> <file> ::= "<" ( "~" | "." | <id> ) ( "/" <id> )* ( "." <id> )* ">" <int> ::= DIGIT DIGIT* <str> ::= "\"" ANY* "\"" <varexpr> ::= <id> " "? ( "+" | "-" | "*" | "/" ) " "? ( <id> | <int> ) <id> ::= LETTER-UPPER | LETTER-LOWER | "_" | id id <newline> ::= ( "\r" | "\r\n" ) ( "\r" | "\r\n" )* <endl> ::= ( ";" " "? | ";" <newline> | <newline> )
Examples
Hello, World!
FROM "Hello, World!" TO OUT
Infinite cat
FROM IN TO OUT FROM 0 TO LINE
Truth-machine
FROM IN TO n FROM "0" TO 6 FROM "1" TO 4 FROM n TO LINE FROM 1 TO OUT FROM 4 TO LINE FROM 0 TO OUT
Variable operations
This program creates a variable, initializes it to 7, sets it to 19, increments it, then divides it by 4 and prints its value.
FROM 7 TO myVar FROM 19 TO myVar FROM myVar TO myVar - 1 FROM myVar TO myVar * 4 FROM myVar TO OUT
Computational class
FROM HERE TO THERE’s computational class is unknown.