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 | Posted by Dmitry Olshansky
in reply to milvakili |  Permalink Reply |
|
Dmitry Olshansky 
Posted in reply to milvakili
| 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
--- Comment #1 from Dmitry Olshansky <dmitry.olsh@gmail.com> 2013-08-15 11:41:33 PDT ---
(In reply to comment #0)
> 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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