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ENHANCED: format_//2 now supports ~a, ~d, ~Nd, ~D, ~ND, ~Nn, ~i and ~*

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This commit is contained in:
Markus Triska
2020-03-19 21:51:53 +01:00
parent b9561ec8db
commit f09a3142a6
1 changed files with 87 additions and 22 deletions
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109
src/prolog/lib/format.pl
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@@ -18,18 +18,29 @@
~w use the next available argument from Arguments here,
which must be atomic (a current limitation)
~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
~s use the next argument here, which must be a string
~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
~N+ where N is an integer: place a tab stop N characters
after the previous tab stop (or start of line)
~t distribute spaces evenly between the two closest tab stops
~`Ct like ~t, use character C instead of spaces to fill the space
~n newline
~Nn N newlines
~i ignore the next argument
~~ the literal ~
Instead of ~N, you can write ~* to use the next argument from Arguments
as the numeric argument.
The predicate format/2 is like format_//2, except that it outputs
the text on the terminal instead of describing it declaratively.
@@ -44,8 +55,8 @@
Example:
?- phrase(format_("~s~n~`.t~w!~12|", ["hello",there]), Cs).
%@ Cs = [h,e,l,l,o,'\n','.','.','.','.','.','.',t,h,e,r,e,!] ;
%@ false.
%@ Cs = [h,e,l,l,o,'\n','.','.','.','.','.','.',t,h,e,r,e,!]
%@ ; false.
I place this code in the public domain. Use it in any way you want.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
@@ -131,30 +142,74 @@ element_gluevar(glue(_,V), N, N) --> [V].
consume whitespace in the sense of format strings.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
cells([], _, Tab, Es) --> cell(Tab, Tab, Es).
cells([], Args, Tab, Es) -->
( { Args == [] } -> cell(Tab, Tab, Es)
; { domain_error(no_remaining_arguments, Args) }
).
cells([~,~|Fs], Args, Tab, Es) --> !,
cells(Fs, Args, Tab, [chars("~")|Es]).
cells([~,w|Fs], [Arg|Args], Tab, Es) --> !,
{ arg_chars(Arg, Chars) },
cells(Fs, Args, Tab, [chars(Chars)|Es]).
cells([~,a|Fs], [Arg|Args], Tab, Es) --> !,
{ atom_chars(Arg, Chars) },
cells(Fs, Args, Tab, [chars(Chars)|Es]).
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, [d|Fs], Args0, [Arg|Args]) },
!,
{ number_chars(Arg, Cs0) },
( { Num =:= 0 } -> { Cs = Cs0 }
; { length(Cs0, L),
( L =< Num ->
Delta is Num - L,
length(Zs, Delta),
maplist(=('0'), Zs),
phrase(("0.",list(Zs),list(Cs0)), Cs)
; BeforeComma is L - Num,
length(Bs, BeforeComma),
append(Bs, Ds, Cs0),
phrase((list(Bs),".",list(Ds)), Cs)
) }
),
cells(Fs, Args, Tab, [chars(Cs)|Es]).
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, ['D'|Fs], Args0, [Arg|Args]) },
!,
{ number_chars(Num, NCs),
phrase(("~",list(NCs),"d"), FStr),
phrase(format_(FStr, [Arg]), Cs0),
phrase(upto_what(Bs0, .), Cs0, Ds),
reverse(Bs0, Bs1),
phrase(groups_of_three(Bs1), Bs2),
reverse(Bs2, Bs),
append(Bs, Ds, Cs) },
cells(Fs, Args, Tab, [chars(Cs)|Es]).
cells([~,i|Fs], [_|Args], Tab, Es) --> !,
cells(Fs, Args, Tab, Es).
cells([~,n|Fs], Args, Tab, Es) --> !,
cell(Tab, Tab, Es),
[newline],
n_newlines(1),
cells(Fs, Args, 0, []).
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, [n|Fs], Args0, Args) },
!,
cell(Tab, Tab, Es),
n_newlines(Num),
cells(Fs, Args, 0, []).
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) },
cells(Fs, Args, Tab, [chars(Chars)|Es]).
cells([~|Fs0], [Arg|Args], Tab, Es) -->
{ numeric_argument(Fs0, Num, [f|Fs]) },
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, [f|Fs], Args0, [Arg|Args]) },
!,
{ number_chars(Arg, Cs0),
phrase(upto_what(Bs, '.'), Cs0, Cs),
phrase(upto_what(Bs, .), Cs0, Cs),
( Num =:= 0 -> Chars = Bs
; ( Cs = ['.'|Rest] ->
length(Rest, L),
( Num < L,
( Num < L ->
length(Ds, Num),
append(Ds, _, Rest)
; Num =:= L ->
@@ -165,11 +220,11 @@ cells([~|Fs0], [Arg|Args], Tab, Es) -->
% greater accuracy here, and use the
% actual digits instead of 0.
length(Zs, Delta),
maplist(=(0), Zs),
maplist(=('0'), Zs),
append(Rest, Zs, Ds)
)
; length(Ds, Num),
maplist(=(0), Ds)
maplist(=('0'), Ds)
),
append(Bs, ['.'|Ds], Chars)
) },
@@ -178,13 +233,13 @@ cells([~,'`',Char,t|Fs], Args, Tab, Es) --> !,
cells(Fs, Args, Tab, [glue(Char,_)|Es]).
cells([~,t|Fs], Args, Tab, Es) --> !,
cells(Fs, Args, Tab, [glue(' ',_)|Es]).
cells([~|Fs0], Args, Tab, Es) -->
{ numeric_argument(Fs0, Num, ['|'|Fs]) },
cells([~|Fs0], Args0, Tab, Es) -->
{ numeric_argument(Fs0, Num, ['|'|Fs], Args0, Args) },
!,
cell(Tab, Num, Es),
cells(Fs, Args, Num, []).
cells([~|Fs0], Args, Tab0, Es) -->
{ numeric_argument(Fs0, Num, ['+'|Fs]) },
cells([~|Fs0], Args0, Tab0, Es) -->
{ numeric_argument(Fs0, Num, [+|Fs], Args0, Args) },
!,
{ Tab is Tab0 + Num },
cell(Tab0, Tab, Es),
@@ -192,14 +247,18 @@ cells([~|Fs0], Args, Tab0, Es) -->
cells([~,C|_], _, _, _) -->
{ atom_chars(A, [~,C]),
domain_error(format_string, A) }.
cells([F|Fs0], Args, Tab, Es) -->
{ phrase(upto_what(Fs1, ~), [F|Fs0], Fs),
cells(Fs0, Args, Tab, Es) -->
{ phrase(upto_what(Fs1, ~), Fs0, Fs),
Fs1 = [_|_] },
cells(Fs, Args, Tab, [chars(Fs1)|Es]).
domain_error(Type, Term) :-
throw(error(domain_error(Type, Term), _)).
n_newlines(0) --> !.
n_newlines(1) --> !, [newline].
n_newlines(N0) --> { N0 > 1, N is N0 - 1 }, [newline], n_newlines(N).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
?- phrase(upto_what(Cs, ~), "abc~test", Rest).
Cs = [a,b,c], Rest = [~,t,e,s,t].
@@ -211,6 +270,8 @@ upto_what([], W), [W] --> [W], !.
upto_what([C|Cs], W) --> [C], !, upto_what(Cs, W).
upto_what([], _) --> [].
groups_of_three([A,B,C,D|Rs]) --> !, [A,B,C], ",", groups_of_three([D|Rs]).
groups_of_three(Ls) --> list(Ls).
cell(From, To, Es0) -->
( { Es0 == [] } -> []
@@ -218,13 +279,17 @@ cell(From, To, Es0) -->
[cell(From,To,Es)]
).
%?- numeric_argument("2f", Num, ['f'|Fs]).
%?- numeric_argument("2f", Num, ['f'|Fs], Args0, Args).
%?- numeric_argument("100b", Num, Rs).
%?- numeric_argument("100b", Num, Rs, Args0, Args).
numeric_argument(Ds, Num, Rest) :-
numeric_argument_(Ds, [], Ns, Rest),
foldl(pow10, Ns, 0-0, Num-_).
numeric_argument(Ds, Num, Rest, Args0, Args) :-
( Ds = [*|Rest] ->
Args0 = [Num|Args]
; numeric_argument_(Ds, [], Ns, Rest),
foldl(pow10, Ns, 0-0, Num-_),
Args0 = Args
).
numeric_argument_([D|Ds], Ns0, Ns, Rest) :-
( member(D, "0123456789") ->