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digitalmars.D.bugs - [Issue 10824] New: Unsupported regexp(?>) error during run time

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10824

           Summary: Unsupported regexp(?>) error during run time
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: maliyatbaz gmail.com



void main(string argv[]) {
auto myRegex = regex(`(?>test)`, "i");
}

Compiles but throws the following run time error.  I think this should be
handled during compile time.

std.regex.RegexException /opt/compilers/dmd2/include/std/regex.d(1947):  ':',
'=', '<', 'P' or '!' expected after '(?' 
Pattern with error: `(?>` <--HERE-- `test)`
Pattern with error: `(?>` <--HERE-- `test)`
----------------
/home/d677/f315(ref  trusted std.regex.Parser!(immutable(char)[]).Parser
std.regex.Parser!(immutable(char)[]).Parser.__ctor!(const(char)[]).__ctor(immutable(char)[],
const(char)[])+0x98) [0x469978]
/home/d677/f315( safe std.regex.Regex!(char).Regex
std.regex.regexImpl!(immutable(char)[]).regexImpl(immutable(char)[],
const(char)[])+0x5a) [0x453bca]
/home/d677/f315(std.regex.Regex!(char).Regex
std.functional.memoize!(_D3std5regex18__T9regexImplTAyaZ9regexImplFNfAyaAxaZS3std5regex12__T5RegexTaZ5Regex,
8).memoize(immutable(char)[], const(char)[])+0xe5) [0x470a55]
/home/d677/f315( trusted std.regex.Regex!(char).Regex
std.regex.regex!(immutable(char)[]).regex(immutable(char)[],
const(char)[])+0x41) [0x453b59]
/home/d677/f315(_Dmain+0x39) [0x4537f9]
/home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
int function(char[][])*).void runMain()+0x18) [0x47bb4c]
/home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
int function(char[][])*).void tryExec(scope void delegate())+0x2a) [0x47b67e]
/home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
int function(char[][])*).void runAll()+0x40) [0x47bb9c]
/home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
int function(char[][])*).void tryExec(scope void delegate())+0x2a) [0x47b67e]
/home/d677/f315(_d_run_main+0x1ae) [0x47b63a]
/home/d677/f315(main+0x17) [0x47b487]
/usr/lib/libc.so.6(__libc_start_main+0xf5) [0x40967a15]

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10824


Andrei Alexandrescu <andrei erdani.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei erdani.com
         AssignedTo|nobody puremagic.com        |dmitry.olsh gmail.com
           Severity|normal                      |blocker


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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10824


Dmitry Olshansky <dmitry.olsh gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |INVALID



11:41:33 PDT ---


 void main(string argv[]) {
 auto myRegex = regex(`(?>test)`, "i");
 }
 
 Compiles but throws the following run time error.  I think this should be
 handled during compile time.


It can't as auto myRegex is a run-time varaible and the expression on the right
may as well depend on external variables. See e.g. 

auto myRegex = regex(argv[1], "i");

How would that be handled at compile time?

But you can have your checking (and parsing btw) done at C-T using static:
static myRegex = regex(`(?>test)`, "i"); 

In the above myRegex will be precompiled at CTFE. No spedcial native code
generated unlike ctRegex, but no parsing at runtime. If need be you can create
static arrays of regex patterns at CTFE and later on assign them to local auto
variables.

So I'm marking this as resolved-invalid as there is nothing that can be done to
make original do CTFE (at the language level), and there is an easy solution
that is explicit and works.


 
 std.regex.RegexException /opt/compilers/dmd2/include/std/regex.d(1947):  ':',
 '=', '<', 'P' or '!' expected after '(?' 
 Pattern with error: `(?>` <--HERE-- `test)`
 Pattern with error: `(?>` <--HERE-- `test)`
 ----------------
 /home/d677/f315(ref  trusted std.regex.Parser!(immutable(char)[]).Parser
 std.regex.Parser!(immutable(char)[]).Parser.__ctor!(const(char)[]).__ctor(immutable(char)[],
 const(char)[])+0x98) [0x469978]
 /home/d677/f315( safe std.regex.Regex!(char).Regex
 std.regex.regexImpl!(immutable(char)[]).regexImpl(immutable(char)[],
 const(char)[])+0x5a) [0x453bca]
 /home/d677/f315(std.regex.Regex!(char).Regex
 std.functional.memoize!(_D3std5regex18__T9regexImplTAyaZ9regexImplFNfAyaAxaZS3std5regex12__T5RegexTaZ5Regex,
 8).memoize(immutable(char)[], const(char)[])+0xe5) [0x470a55]
 /home/d677/f315( trusted std.regex.Regex!(char).Regex
 std.regex.regex!(immutable(char)[]).regex(immutable(char)[],
 const(char)[])+0x41) [0x453b59]
 /home/d677/f315(_Dmain+0x39) [0x4537f9]
 /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
 int function(char[][])*).void runMain()+0x18) [0x47bb4c]
 /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
 int function(char[][])*).void tryExec(scope void delegate())+0x2a) [0x47b67e]
 /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
 int function(char[][])*).void runAll()+0x40) [0x47bb9c]
 /home/d677/f315(extern (C) int rt.dmain2._d_run_main(int, char**, extern (C)
 int function(char[][])*).void tryExec(scope void delegate())+0x2a) [0x47b67e]
 /home/d677/f315(_d_run_main+0x1ae) [0x47b63a]
 /home/d677/f315(main+0x17) [0x47b487]
 /usr/lib/libc.so.6(__libc_start_main+0xf5) [0x40967a15]


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