I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)


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This programming language may be used to instruct a computer to perform a task.
Official website
Execution method: Interpreted
Garbage collected: No
Type strength: Strong
See Also:

Listed below are all of the tasks on Rosetta Code which have been solved using Ursa.
Your Help Needed
If you know Ursa, please write code for some of the tasks not implemented in Ursa.


Ursa is a simple programming language that I've been working on for awhile now. Its syntax is (at times) similar to Lisp, but instead of being list-based, it is "stream-based." Most in-built statements operate on types of data called streams. Streams are are variable-length arrays of data of a certain type.

The basic premise of ursa is to function as a very high-level abstraction layer between streams and "I/O devices." I/O devices are objects that represent locations that can be read and written using data streams; namely, the console, files, and network ports. Ursa greatly simplifies the implementation of programs that transfer data between these devices.

Ursa uses reverse polish notation for math and functions are simply seperated from their arguments by space characters. This makes implentation of Standard Ursa interpreters since this syntax is easier to write a parser for.

Example Code[edit]

Raw File Transfer[edit]

This Ursa code opens a port on a remote server, then outputs the specified file to the port.

if (< (size args) 4)
out "usage: " args<0> " [server] [port] [file]" endl console
end if
decl file f
decl port p
f.open args<3>
p.connect args<1> (int args<2>)
out (f.readall) p

Single-User Echo Server[edit]

# declare a serverport and a port to attach new connections to
declare serverport sp
declare port p
# declare a string to contain lines of input
declare string input
# attach the serverport to port 20000
sp.attach 20000
# loop indefinitely, getting connections then echoing the data they send
while true
set p (sp.getconn)
out "%msg: connection from " (p.addr) endl console
out "echo server " _version endl endl p
while true
set input (in string p)
out input endl p
if (and (= input "") (not (p.isopen 1000)))
end if
end while
out "%msg: connection closed" endl console
end while

See Also[edit]


This category has the following 2 subcategories, out of 2 total.

Pages in category "Ursa"

The following 110 pages are in this category, out of 110 total.