Hi!

I would like to print a string in the same format that I would write it in the code (with quotes and with special characters escaped). Similar to Go's %q format. Is there a safe, built-in way to do that?

For example:

string s = "one \"two\"\nthree four";
writeln(/* ??? */);

And get as output

"one \"two\"\nthree four"

Instead of

one "two"
three four

On Sunday, 2 January 2022 at 17:33:22 UTC, Ali Çehreli wrote:

Thank you! I think my question was misunderstood though.

I am not looking to change the input string (as the backticks would do), but the output string.

Like this:

assert(some_formatting("one \"two\"\nthree four") == `"one \"two\"\nthree four"`);

I hope this clarifies :)

On Sunday, 2 January 2022 at 17:27:53 UTC, Amit wrote:

string s = "one \"two\"\nthree four";
writeln(/* ??? */);

"one \"two\"\nthree four"

one "two"
three four

as a hack I always do:

writeln([s]);

because arrays get serialized like D strings, there will be additional [ and ] though.

Sample output:

["Hello there \"uwu\" ``\x1B[Dabc\n"]

On Sunday, 2 January 2022 at 17:27:53 UTC, Amit wrote:

string s = "one \"two\"\nthree four";
writeln(/* ??? */);

"one \"two\"\nthree four"

one "two"
three four

Also a bit of a hack.

import std.stdio : writeln;
import std.format : format;


    void main()
    {
        string s = "one \"two\"\nthree four";
        writeln(format("%(%s%)",[s]));

}

On Sunday, 2 January 2022 at 19:26:50 UTC, WebFreak001 wrote:

writeln([s]);

["Hello there \"uwu\" ``\x1B[Dabc\n"]

On Sunday, 2 January 2022 at 19:37:38 UTC, JG wrote:

import std.stdio : writeln;
import std.format : format;


    void main()
    {
        string s = "one \"two\"\nthree four";
        writeln(format("%(%s%)",[s]));

}

Yes! That's what I needed.

I wrapped it in a function like so:

string quote(string s) {
    return format("%s", [s])[1 .. $ - 1];
}
unittest {
    assert(quote("one \"two\"\nthree four") == `"one \"two\"\nthree four"`);
}

Thanks for your responses ^_^

On Sunday, 2 January 2022 at 21:16:55 UTC, Amit wrote:

string quote(string s) {
    return format("%s", [s])[1 .. $ - 1];
}
unittest {
    assert(quote("one \"two\"\nthree four") == `"one \"two\"\nthree four"`);
}

Hi, I also need a function to "unquote" string, like this:

assert(unquote(`\n`)=="\n");

Is there a way to do that?

On Sunday, 20 March 2022 at 09:42:44 UTC, Caten wrote:

string quote(string s) {
    return format("%s", [s])[1 .. $ - 1];
}
unittest {
    assert(quote("one \"two\"\nthree four") == `"one \"two\"\nthree four"`);
}

assert(unquote(`\n`)=="\n");

void main()
{
  import std.array : replace;

  auto q = `Hello,\n deneme`;
  auto p = "Hello,\n deneme";

  assert(q.replace("\\n", "\n") == p);
}

SDB@79

On Sunday, 20 March 2022 at 09:42:44 UTC, Caten wrote:

assert(unquote(`\n`)=="\n");

I rolled my own for that recently:

string dequote(string str) @safe pure {
	if (str.length < 2)
		return str;
	if ((str[0] == '"' || str[0] == '\'' || str[0] == '`') && str[$-1] == str[0]) {
		return str[1 .. $-1];
	}
	return str;
}

On Tuesday, 22 March 2022 at 07:18:00 UTC, cc wrote:

assert(unquote(`\n`)=="\n");

string dequote(string str) @safe pure {
	if (str.length < 2)
		return str;
	if ((str[0] == '"' || str[0] == '\'' || str[0] == '`') && str[$-1] == str[0]) {
		return str[1 .. $-1];
	}
	return str;
}

Oops, I misread what you were asking for. Was thinking quotes like quotation marks, not backslashes.