CODEWITHSUNDEEP
argumentscommandlinequotesswi-prolog
Lucian Green
Lucian Green

Reputation: 178

How can I include double quotes in a SWI-PL command line argument?

Given the code a2.pl:

%% prolog (swipl) command line arguments
%% swipl -s a2.pl -t a --quiet -- "b" "c" "D"
%% which outputs to screen: ['D']

writeln1(Term) :-
    term_to_atom(Term,Atom),
    writeln(Atom),!.

a:-
current_prolog_flag(argv, AllArgs),
AllArgs=[_,_ | Args],
writeln1(Args),halt.

How can I make my query swipl -s a2.pl -t a --quiet "b" "c" "[[v,b],":-",[[[n,=]]]]" which returns

['[[v,b],:-,[[[n,=]]]]']

return

[[v,b],":-",[[[n,=]]]]

?

Upvotes: 1

Views: 67

Answers (1)

Lucian Green
Lucian Green

Reputation: 178

I found that the following method could be used to process the term, transforming it to a list, calling a2.pl's a predicate and then transforming it back to a term.

%% term_to_atom([[v,b],":-",[[[n,=]]]],B).
%% B = '[[v,b],":-",[[[n,=]]]]'.

%% ?- string_atom(A,'[[v,b],":-",[[[n,=]]]]').
%% A = "[[v,b],\":-\",[[[n,=]]]]".

%% swipl -s a2.pl -t a --quiet "b" "c" "[[v,b],\":-\",[[[n,=]]]]"
%% ['[[v,b],":-",[[[n,=]]]]']

%% ?- term_to_atom(A,'[[v,b],":-",[[[n,=]]]]').
%% A = [[v, b], ":-", [[[n, =]]]].

Upvotes: 2

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