To run the parser:
(1) Open ghci, the Haskell interactive prompt.
(2) Load the file AST.hs
(3) Give any expression- belonging to the LEXICAL language- as a string to the function run.
(note: the evaluator has not been implemented yet!)
$ ghci
Prelude> :l AST.hs
Prelude> :l AST.hs
[1 of 3] Compiling ParseUtils ( ParseUtils.hs, interpreted )
[2 of 3] Compiling ASTParser ( ASTParser.hs, interpreted )
[3 of 3] Compiling Main ( AST.hs, interpreted )
Ok, three modules loaded.
*Main> run "( + 1 2 )"
3