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ENHANCED: format_//2 now evaluates arithmetic expressions for ~d, ~D, ~f, ~r and ~R

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Example:

    ?- phrase(format_("~d", [1+2]), Cs).
       Cs = "3"
    ;  false.
This commit is contained in:
Markus Triska
2020-06-07 23:14:23 +02:00
parent c8a9f8dcf5
commit 9bb851d437
1 changed files with 9 additions and 4 deletions
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13
src/prolog/lib/format.pl
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@@ -174,7 +174,7 @@ cells([~,a|Fs], [Arg|Args], Tab, Es) --> !,
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, [d|Fs], Args0, [Arg|Args]) },
!,
{ number_chars(Arg, Cs0) },
{ format_number_chars(Arg, Cs0) },
( { Num =:= 0 } -> { Cs = Cs0 }
; { length(Cs0, L),
( L =< Num ->
@@ -216,12 +216,12 @@ cells([~|Fs0], Args0, Tab, Es) -->
cells([~,s|Fs], [Arg|Args], Tab, Es) --> !,
cells(Fs, Args, Tab, [chars(Arg)|Es]).
cells([~,f|Fs], [Arg|Args], Tab, Es) --> !,
{ number_chars(Arg, Chars) },
{ format_number_chars(Arg, Chars) },
cells(Fs, Args, Tab, [chars(Chars)|Es]).
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, [f|Fs], Args0, [Arg|Args]) },
!,
{ number_chars(Arg, Cs0),
{ format_number_chars(Arg, Cs0),
phrase(upto_what(Bs, .), Cs0, Cs),
( Num =:= 0 -> Chars = Bs
; ( Cs = ['.'|Rest] ->
@@ -279,6 +279,10 @@ cells(Fs0, Args, Tab, Es) -->
Fs1 = [_|_] },
cells(Fs, Args, Tab, [chars(Fs1)|Es]).
format_number_chars(N0, Chars) :-
N is N0, % evaluate compound expression
number_chars(N, Chars).
n_newlines(0) --> !.
n_newlines(N0) --> { N0 > 0, N is N0 - 1 }, [newline], n_newlines(N).
@@ -327,7 +331,8 @@ pow10(D, N0-Pow0, N-Pow) :-
N is N0 + D*10^Pow0,
Pow is Pow0 + 1.
integer_to_radix(I, R, Which, Cs) :-
integer_to_radix(I0, R, Which, Cs) :-
I is I0, % evaluate compound expression
must_be(integer, I),
must_be(integer, R),
( \+ between(2, 36, R) ->