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% functions for obtaining a line of input text and parsing
% it into a list of words
% prompt provides the user with a '>' prompt as well
% readList merely obtains and parses the input
prompt(L) :-
write('> '),
readList(L).
readList(L) :-
readLine(X),
wordList(L,X,[]), !.
readLine(L) :-
get0(C),
buildList(C,L).
buildList(10,[]) :- !.
buildList(C,[C|X]) :-
get0(C2),
buildList(C2,X).
wordList([X|Y]) --> word(X), whitespace, wordList(Y).
wordList([X]) --> whitespace, wordList(X).
wordList([X]) --> word(X).
wordList([X]) --> whitespace, word(X).
word(W) --> charList(X), {name(W,X)}.
charList([X|Y]) --> char(X), charList(Y).
charList([X]) --> char(X).
char(X) --> [X], {X>=33}.
whitespace --> whsp, whitespace.
whitespace --> whsp.
whsp --> [X], {X<33}.
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