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What does “fragment” mean in ANTLR?
...lly they'll improve readability of your grammars.
look at this example :
STRING : '"' (ESC | ~["\\])* '"' ;
fragment ESC : '\\' (["\\/bfnrt] | UNICODE) ;
fragment UNICODE : 'u' HEX HEX HEX HEX ;
fragment HEX : [0-9a-fA-F] ;
STRING is a lexer using fragment rule like ESC .Unicode is used in Esc r...
Collection that allows only unique items in .NET?
...
}
}
and you can use it like follows
var uniquelist = UniqueList<string>.NewList;
uniquelist.Add("abc","def","ghi","jkl","mno");
uniquelist.Add("abc","jkl");
var _myList = uniquelist.List;
will only return "abc","def","ghi","jkl","mno" always even when duplicates are added to it
...
Sorting a tab delimited file
...t' -k3 -nr file.txt
Notice the dollar sign in front of the single-quoted string. You can read about
it in the ANSI-C Quoting sections of the bash man page.
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How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
...reventing redirects) you can hash some of the request parameters to make a string based on the content and then check that you haven't sent it already.
//create digest of the form submission:
$messageIdent = md5($_POST['name'] . $_POST['email'] . $_POST['phone'] . $_POST['comment']);
//and ch...
What's the difference between Unicode and UTF-8? [duplicate]
...uses UTF-16LE encoding internally as the memory storage format for Unicode strings, it considers this to be the natural encoding of Unicode text. In the Windows world, there are ANSI strings (the system codepage on the current machine, subject to total unportability) and there are Unicode strings (s...
Search and replace in Vim across all the project files
...his in two simple commands using whatever grep tool you have installed. No extra plugins required!:
1. :grep <search term>
2. :cdo %s/<search term>/<replace term>/gc
3. (If you want to save the changes in all files) :cdo update
(cdo executes the given command to each term in the...
Is there a performance difference between i++ and ++i in C++?
...n the following:
00401000 push 0Ah
00401002 push offset string "Value: %d\n" (402104h)
00401007 call dword ptr [__imp__printf (4020A0h)]
So while it's certainly the case that the postfix version could be slower, it may well be that the optimizer will be good enough to ...
Static variables in JavaScript
... the static variable is never going to be falsey (false, 0, null, or empty string)
– Kip
Sep 23 '11 at 17:25
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Transposing a 2D-array in JavaScript
...rt solution. just learned about the ... operator - used it to break down a string into an array of letters... thanks for the reply
– Julix
Sep 9 '16 at 17:15
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Make a UIButton programmatically in Swift
...t practices in Swift 2.2. #selector() should be used rather than a literal string which is deprecated.
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