Execute HQ9+/Ursa

From Rosetta Code
Execute HQ9+/Ursa is part of RCHQ9+. You may find other members of RCHQ9+ at Category:RCHQ9+.
Execute HQ9+/Ursa is an implementation of HQ9+. Other implementations of HQ9+.

This is an HQ9+ interpreter written in Standard Ursa. It expects the filename of an HQ9+ source file as a command-line argument.

#
# hq9+ interpreter in ursa
#
 
# check if a file was provided on the command line; if not, stop
if (> (size args) 2)
out "error: no file provided" endl console
end if
 
# safely open the file by creating it first, then read it
decl file f
f.create args<1>
f.open args<1>
decl string hq9
set hq9 (f.readall)
f.close
 
# interpret the hq9+
# define an int to be the accumlator (even though this isn't technically
# an accumulator)
decl int accum
for (decl int i) (< i (size hq9)) (inc i)
if (= (lower hq9<i>) "h")
out "hello world!" endl console
end if
if (= (lower hq9<i>) "q")
out hq9 console
end if
if (= hq9<i> "9")
decl int bottles
decl string bottlestr
 
for (set bottles 99) (> bottles 0) (dec bottles)
if (= bottles 1)
set bottlestr "bottle"
else
set bottlestr "bottles"
end if
 
out bottles " " bottlestr " of beer on the wall" endl console
out bottles " " bottlestr " of beer" endl console
out "Take one down, pass it around." endl console
 
if (not (= bottles 2))
out (int (- bottles 1)) " bottles of beer on the wall." endl endl console
else
out (int (- bottles 1)) " bottle of beer on the wall." endl endl console
end if
end for
end if
if (= hq9<i> "+")
set accum (int (+ accum 1))
end if
end for