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digitalmars.D.bugs - [Issue 7341] New: writefln of strings array with size formatting

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7341

           Summary: writefln of strings array with size formatting
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc


--- Comment #0 from bearophile_hugs eml.cc 2012-01-21 15:28:00 PST ---
D2 code:

import std.stdio;
void main() {
    int[] a1 = [1, 10, 5];
    writefln("%12d", a1);
    string[] a2 = ["red", "yellow", "ya"];
    writefln("%12s", a2);
}



Output:
[           1,           10,            5]
["red", "yellow", "ya"]



But I expect an output more like:
[           1,           10,            5]
[       "red",     "yellow",         "ya"]

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7341


SomeDude <lovelydear mailmetrash.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lovelydear mailmetrash.com


--- Comment #1 from SomeDude <lovelydear mailmetrash.com> 2012-04-21 05:12:33
PDT ---
Was writefln supposed to work or arrays ? Here is what I get on 2.059:

PS E:\DigitalMars\dmd2\samples> rdmd bug.d
object.Exception E:\DigitalMars\dmd2\windows\bin\..\..\src\phobos\std\format.d(1886):
Incorrect format specifier for range: %d

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--- Comment #2 from Kenji Hara <k.hara.pg gmail.com> 2012-04-21 06:26:55 PDT ---
(In reply to comment #0)

 D2 code:
 
 import std.stdio;
 void main() {
     int[] a1 = [1, 10, 5];
     writefln("%12d", a1);
     string[] a2 = ["red", "yellow", "ya"];
     writefln("%12s", a2);
 }
 
 Output:
 [           1,           10,            5]
 ["red", "yellow", "ya"]
 
 But I expect an output more like:
 [           1,           10,            5]
 [       "red",     "yellow",         "ya"]


If you want to give format specifier for elements explicitly, you should use
compound format specifier (It is %( and %).)

    writefln("[%(%12d, %)]", [1, 10, 5]);
    writefln("[%(%12s, %)]", ["red", "yellow", "ya"]);

But, this code output:
[           1,           10,            5]
["red", "yellow", "ya"]

Because, string elements and character elements are treated specially. They are
quoted, and other specifications are ignored.

https://github.com/D-Programming-Language/phobos/blob/master/std/format.d#L1930

But, I agree it is debatable thing.

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Stewart Gordon <smjg iname.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |smjg iname.com


--- Comment #3 from Stewart Gordon <smjg iname.com> 2012-04-21 08:48:54 PDT ---
The reason for the original behaviour seems to be that the width specified for
%s is taken to be the width to which the whole argument is formatted, not the
width to which each element of the array is formatted.

But I'm getting the same error as SomeDude (DMD 2.059, Win32).  Kenji - what
setup do you have that's giving a different result?

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--- Comment #4 from SomeDude <lovelydear mailmetrash.com> 2012-04-21 12:07:22
PDT ---
(In reply to comment #3)

 But I'm getting the same error as SomeDude (DMD 2.059, Win32).  Kenji - what
 setup do you have that's giving a different result?


He wrote it. The code that's supposed to work is:

import std.stdio;
void main() {
    writefln("[%(%12d, %)]", [1, 10, 5]);
    writefln("[%(%12s, %)]", ["red", "yellow", "ya"]);
}

Not the original test example.

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