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ENHANCED: ~w now supports compound terms, and ~q is now also available

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This commit is contained in:
Markus Triska
2020-04-12 19:54:52 +02:00
parent f2cf0ec459
commit c9f1a95343
1 changed files with 25 additions and 30 deletions
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55
src/prolog/lib/format.pl
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@@ -16,16 +16,16 @@
The characters in FormatString are used literally, except
for the following tokens with special meaning:
~w use the next available argument from Arguments here,
which must be atomic (a current limitation)
~w use the next available argument from Arguments here
~q use the next argument here, formatted as by writeq/1
~a use the next argument here, which must be an atom
~s use the next argument here, which must be a string
~d use the next argument here, which must be an integer
~f use the next argument here, a floating point number
~Nf where N is an integer: format the float argument
using N digits after the decimal point
~Nd like ~d, placing the last N digits after a decimal point
If N is 0 or omitted, no decimal point is used.
~Nd like ~d, placing the last N digits after a decimal point;
if N is 0 or omitted, no decimal point is used.
~ND like ~Nd, separating digits to the left of the decimal point
in groups of three, using the character "," (comma)
~N| where N is an integer: place a tab stop at text column N
@@ -68,6 +68,7 @@
:- use_module(library(dcgs)).
:- use_module(library(lists)).
:- use_module(library(error)).
:- use_module(library(charsio)).
format_(Fs, Args) -->
{ must_be(list, Fs),
@@ -149,7 +150,10 @@ cells([], Args, Tab, Es) -->
cells([~,~|Fs], Args, Tab, Es) --> !,
cells(Fs, Args, Tab, [chars("~")|Es]).
cells([~,w|Fs], [Arg|Args], Tab, Es) --> !,
{ arg_chars(Arg, Chars) },
{ write_term_to_chars(Arg, [], Chars) },
cells(Fs, Args, Tab, [chars(Chars)|Es]).
cells([~,q|Fs], [Arg|Args], Tab, Es) --> !,
{ write_term_to_chars(Arg, [quoted(true)], Chars) },
cells(Fs, Args, Tab, [chars(Chars)|Es]).
cells([~,a|Fs], [Arg|Args], Tab, Es) --> !,
{ atom_chars(Arg, Chars) },
@@ -304,16 +308,6 @@ pow10(D, N0-Pow0, N-Pow) :-
N is N0 + D*10^Pow0,
Pow is Pow0 + 1.
arg_chars(Arg, Chars) :-
( ( integer(Arg)
; float(Arg)
) ->
number_chars(Arg, Chars)
; must_be(atom, Arg),
atom_chars(Arg, Chars)
).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Impure I/O, implemented as a small wrapper over format_//2.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
@@ -345,38 +339,39 @@ Cs = [cell(0,4,[glue(' ',_38),chars([a]),glue(' ',_62)])].
?- phrase(format_("hello~n~tthere~6|", []), Ls).
?- format("~ta~t~4|", []).
a true ;
false.
a true
; false.
?- format("~ta~tb~tc~10|", []).
a b ctrue ;
false.
a b ctrue
; false.
?- format("~tabc~3|", []).
?- format("~ta~t~4|", []).
?- format("~ta~t~tb~tc~20|", []).
a b c
a b ctrue ;
false.
a b ctrue
; false.
?- format("~2f~n", [3]).
3.00
true ...
3.00
true
?- format("~20f", [0.1]).
0.10000000000000000000true ; % this should use higher accuracy!
false.
0.10000000000000000000true % this should use higher accuracy!
; false.
?- X is atan(2), format("~7f~n", [X]).
1.1071487
X = 1.1071487177940906 ...
1.1071487
X = 1.1071487177940906
?- format("~`at~50|~n", []).
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
true ...
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
true
?- format("~t~N", []).
?- format("~q", [.]).
'.'true
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */