[TxMt] regexp problem - eternal loop - how to cancel?

Hans-Jörg Bibiko bibiko at eva.mpg.de
Thu Sep 4 08:44:21 UTC 2008 

Hi,

I'm just playing with Oniguruma's nested levels etc. In principal it  
works brilliant, BUT it could happen that the regexp engine runs in an  
eternal loop with no chance to cancel that loop.

Example:
<html lang="en">
<body>
<div>
	<div id="2">
		<p>blah</p>
	</div>
</div>
</body>
</html>

regexp: (one line!)
(?-i)(?<element>\g<stag>\g<content>*\g<etag>){0}(?<stag><\g<name> 
\s*[^>]*>){0}(?<name>[a-zA-Z_:]+){0}(?<content>[^<&]+(\g<element>|[^<&] 
+)*){0}(?<etag></\k<name+1>>){0}\g<element>

Place the caret within the p tag and find previous match (SHIFT+APPLE 
+G) and repeat it. Fine this works. The same also works for find next  
match.

But the regexp CANNOT handle up to now tags like <img src="foo">.

So if you have e.g.:

<html lang="en">
<body>
<div>
	<img src="foo">
	<div id="2">
		<p>blah</p>
	</div>
</div>
</body>
</html>

[ATTENTION TextMate will freeze!!!!]
place the caret inside of the p tag and press three time SHIFT+APPLE+G  
and TM freezes. You only can "force quit". Attached is a part of the  
error report.

Of course, this is a problem of the regexp but if one wants to develop  
such a regexp such errors could appear. The question now is how to  
interrupt such an eternal regexp loop??
To be honest I have no idea but maybe one could listen to the keyboard  
event (APPLE+.) inside of the regexp function.

Cheers,

--Hans

Error report:
223 __Z18view_find_previousPN4text4viewE + 1075 (in TextMate) [0x9c719]
223 __ZN9oniguruma4findEPtiiPKNS_6ptrn_tEii + 115 (in TextMate)  
[0xf6639]
11 _onig_search + 414 (in TextMate) [0x161bba]
1 _onig_is_in_code_range + 67 (in TextMate) [0x15c2c1]
1 _utf16le_mbc_enc_len + 22 (in TextMate) [0x16361a]
1 _utf16le_mbc_enc_len + 11 (in TextMate) [0x16360f]
1 _onig_is_in_code_range + 29 (in TextMate) [0x15c29b]
1 _onig_is_in_code_range + 31 (in TextMate) [0x15c29d]
1 _onig_is_in_code_range + 88 (in TextMate) [0x15c2d6]
1 _onig_is_in_code_range + 11 (in TextMate) [0x15c289]
1 _onig_is_in_code_range + 4 (in TextMate) [0x15c282]
1 _mem_is_in_memp + 4 (in TextMate) [0x15c249]
1 _mem_is_in_memp + 5 (in TextMate) [0x15c24a]
1 _utf16le_mbc_to_code + 17 (in TextMate) [0x163651]
8 _match_at + 3858 (in TextMate) [0x15d291]
7 _match_at + 10242 (in TextMate) [0x15eb81]
7 _match_at + 8800 (in TextMate) [0x15e5df]
7 _match_at + 3848 (in TextMate) [0x15d287]
7 _match_at + 3814 (in TextMate) [0x15d265]
6 _match_at + 8811 (in TextMate) [0x15e5ea]
6 _match_at + 339 (in TextMate) [0x15c4d2]
6 _match_at + 3842 (in TextMate) [0x15d281]
6 _match_at + 10259 (in TextMate) [0x15eb92]
5 _match_at + 8784 (in TextMate) [0x15e5cf]
5 _match_at + 6579 (in TextMate) [0x15dd32]
4 _match_at + 2121 (in TextMate) [0x15cbc8]
4 _match_at + 3834 (in TextMate) [0x15d279]
4 _match_at + 10216 (in TextMate) [0x15eb67]
4 _match_at + 6626 (in TextMate) [0x15dd61]
4 _match_at + 3825 (in TextMate) [0x15d270]
4 _match_at + 6599 (in TextMate) [0x15dd46]
3 _match_at + 341 (in TextMate) [0x15c4d4]
3 _match_at + 8795 (in TextMate) [0x15e5da]
3 _match_at + 11214 (in TextMate) [0x15ef4d]
3 _match_at + 3387 (in TextMate) [0x15d0ba]
3 _match_at + 8790 (in TextMate) [0x15e5d5]
3 _match_at + 8806 (in TextMate) [0x15e5e5]
3 _match_at + 3434 (in TextMate) [0x15d0e9]
3 _match_at + 2195 (in TextMate) [0x15cc12]
3 _match_at + 6614 (in TextMate) [0x15dd55]
2 _match_at + 11317 (in TextMate) [0x15efb4]
2 _match_at + 3816 (in TextMate) [0x15d267]
2 _match_at + 6593 (in TextMate) [0x15dd40]
2 _match_at + 299 (in TextMate) [0x15c4aa]
2 _match_at + 6590 (in TextMate) [0x15dd3d]
2 _match_at + 2108 (in TextMate) [0x15cbbb]
2 _match_at + 1446 (in TextMate) [0x15c925]
2 _match_at + 10232 (in TextMate) [0x15eb77]
2 _match_at + 3811 (in TextMate) [0x15d262]
2 _match_at + 6616 (in TextMate) [0x15dd57]
2 _match_at + 2198 (in TextMate) [0x15cc15]
2 _match_at + 10238 (in TextMate) [0x15eb7d]
2 _match_at + 10227 (in TextMate) [0x15eb72]
2 _match_at + 8798 (in TextMate) [0x15e5dd]
2 _match_at + 10143 (in TextMate) [0x15eb1e]
2 _match_at + 2084 (in TextMate) [0x15cba3]
1 _match_at + 16465 (in TextMate) [0x1603d0]
1 _match_at + 3408 (in TextMate) [0x15d0cf]
1 _match_at + 11320 (in TextMate) [0x15efb7]
1 _match_at + 6548 (in TextMate) [0x15dd13]
1 _match_at + 2146 (in TextMate) [0x15cbe1]

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