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Parse ints; move line/{1,2} to main.pl.

This commit is contained in:
Simon Forman 2019-08-13 11:29:49 -07:00
parent 3f19b2b210
commit defedcbd12
2 changed files with 11 additions and 10 deletions
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10
thun/gnu-prolog/main.pl
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@ -41,3 +41,13 @@ do_line(_Line, S, S) :- write('Err'), nl.
prompt :- write(`joy? `). prompt :- write(`joy? `).
show_stack(S) :- nl, print_stack(S), write(` <-top`), nl, nl. show_stack(S) :- nl, print_stack(S), write(` <-top`), nl, nl.
% Line is the next new-line delimited line from standard input stream as
% a list of character codes.
line(Line) :- get_code(X), line(X, Line).
line(10, []) :- !. % break on new-lines.
line(-1, [eof]) :- !. % break on EOF
line(X, [X|Line]) :- get_code(Y), !, line(Y, Line).

11
thun/gnu-prolog/parser.pl
View File

@ -41,6 +41,7 @@ number_digits(Codes) --> signed_float_or_integer(Codes), !, end_num.
signed_float_or_integer(Codes) --> signed_digits(J), ".", !, digits(I), signed_float_or_integer(Codes) --> signed_digits(J), ".", !, digits(I),
{ append(J, [0'.|I], Codes) }. { append(J, [0'.|I], Codes) }.
signed_float_or_integer(Codes) --> signed_digits(Codes).
signed_digits([45|Codes]) --> "-", !, digits(Codes). signed_digits([45|Codes]) --> "-", !, digits(Codes).
signed_digits( Codes ) --> digits(Codes). signed_digits( Codes ) --> digits(Codes).
@ -69,16 +70,6 @@ one_or_more_([Ch|Rest], P) --> call(P, Ch), one_or_more_(Rest, P).
one_or_more_([Ch], P) --> call(P, Ch). one_or_more_([Ch], P) --> call(P, Ch).
% Line is the next new-line delimited line from standard input stream as
% a list of character codes.
line(Line) :- get_code(X), line(X, Line).
line(10, []) :- !. % break on new-lines.
line(-1, [eof]) :- !. % break on EOF
line(X, [X|Line]) :- get_code(Y), !, line(Y, Line).
/* /*
Print state. Print state.