Task

Implement a    HQ9+    interpreter or compiler.




F hello()
   print(‘Hello, world!’)
 
String src
F quine()
   print(:src)
 
F bottles()
   L(i) (99.<2).step(-1)
      print(‘#. bottles of beer on the wall’.format(i))
      print(‘#. bottles of beer’.format(i))
      print(‘Take one down, pass it around’)
      print(‘#. bottles of beer on the wall’.format(i - 1))
      print()
 
   print(‘2 bottles of beer on the wall’)
   print(‘2 bottles of beer’)
   print(‘Take one down, pass it around’)
   print(‘1 bottle of beer on the wall’)
   print()
 
   print(‘1 bottle of beer on the wall’)
   print(‘1 bottle of beer’)
   print(‘Take one down, pass it around’)
   print(‘No more bottles of beer on the wall’)
   print()
 
   print(‘No more bottles of beer on the wall’)
   print(‘No more bottles of beer on the wall’)
   print(‘Go to the store and buy some more’)
   print(‘99 bottles of beer on the wall.’)
   print()
 
V acc = 0
F incr()
   :acc++
 
:start:
src = File(:argv[1]).read()
 
[Char = (() -> N)] dispatch
dispatch[Char(‘h’)] = hello
dispatch[Char(‘q’)] = quine
dispatch[Char(‘9’)] = bottles
dispatch[Char(‘+’)] = incr
 
L(i) src.lowercase()
   I i C dispatch
      dispatch[i]()