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Re: JavaScriptCore [message #27992 is a reply to message #27962]

Fri, 13 August 2010 09:09

mirek is currently offline

mirek
Messages: 13980
Registered: November 2005

Ultimate Member

cbpporter wrote on Thu, 12 August 2010 03:55

After some superficial testing, running the current ToUpper/ToLower on the whole 65536 range I have found 568/569 errors. This is really great news, seeing as the table only covers 2048 characters. This means that most of Unicode is case agnostic and we can get away with good support without using huge tables. Running it on only 2048 characters, I have found 50/43. I hope I used the correct testing method.

So if somebody can point me to the bit setup of uni__info, I could correct the values for the first 2048 characters. I can figure out most, but it would be better if I could get the real layout of that packed bitfield. If there are any free bits left, I have some data that I would like to store there, like if the character is punctuation, if it is Latin, etc.

I would say this defines it pretty well:

bool IsLetter(int c)        { return (dword)c < 2048 ? uni__info[c] & 0xc0000000 : 0; }
bool IsUpper(int c)         { return (dword)c < 2048 ? uni__info[c] & 0x40000000 : 0; }
bool IsLower(int c)         { return (dword)c < 2048 ? uni__info[c] & 0x80000000 : 0; }
int  ToUpper(int c)         { return (dword)c < 2048 ? (uni__info[c] >> 11) & 2047 : c; }
int  ToLower(int c)         { return (dword)c < 2048 ? uni__info[c] & 2047 : c; }
int  ToAscii(int c)         { return (dword)c < 2048 ? (uni__info[c] >> 22) & 0x7f : 0; }

If bits are 0..31, then (reading the code, please check me...:):

31 lower letter
30 upper letter
22-28 (7 bits) toascii
11-21 (11 bits) toupper
0-10 (11 bits) tolower

Looks like bit 29 is now free, if I am counting well..

It would be nice to know, after fixing <2048, what are codepoints of those more errors - perhaps we could handle them too...

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[Message index]

		JavaScriptCore By: dolik.rce on Sat, 10 July 2010 14:59
		Re: JavaScriptCore By: mirek on Sat, 10 July 2010 16:23
		Re: JavaScriptCore By: dolik.rce on Sat, 10 July 2010 19:29
		Re: JavaScriptCore By: tojocky on Sun, 11 July 2010 00:05
		Re: JavaScriptCore By: dolik.rce on Sun, 11 July 2010 00:15
		Re: JavaScriptCore By: tojocky on Sun, 11 July 2010 14:35
		Re: JavaScriptCore By: dolik.rce on Sun, 11 July 2010 16:24
		Re: JavaScriptCore By: tojocky on Sun, 11 July 2010 20:32
		Re: JavaScriptCore By: dolik.rce on Tue, 13 July 2010 20:39
		Re: JavaScriptCore By: dolik.rce on Wed, 14 July 2010 17:01
		Re: JavaScriptCore By: tojocky on Thu, 15 July 2010 08:25
		Re: JavaScriptCore By: dolik.rce on Thu, 15 July 2010 19:00
		Re: JavaScriptCore By: mirek on Sat, 17 July 2010 09:52
		Re: JavaScriptCore By: dolik.rce on Sat, 17 July 2010 10:55
		Re: JavaScriptCore By: dolik.rce on Sat, 17 July 2010 23:24
		Re: JavaScriptCore By: mirek on Sun, 18 July 2010 08:59
		Re: JavaScriptCore By: dolik.rce on Sun, 18 July 2010 23:04
		Re: JavaScriptCore By: cbpporter on Mon, 19 July 2010 09:10
		Re: JavaScriptCore By: dolik.rce on Sat, 24 July 2010 15:26
		Re: JavaScriptCore By: cbpporter on Mon, 26 July 2010 11:46
		Re: JavaScriptCore By: mirek on Thu, 05 August 2010 12:55
		Re: JavaScriptCore By: dolik.rce on Thu, 05 August 2010 14:00
		Re: JavaScriptCore By: cbpporter on Thu, 12 August 2010 09:55
		Re: JavaScriptCore By: dolik.rce on Thu, 12 August 2010 15:40
		Re: JavaScriptCore By: mirek on Fri, 13 August 2010 09:09
		Re: JavaScriptCore By: cbpporter on Fri, 13 August 2010 10:46
		Re: JavaScriptCore By: cbpporter on Fri, 13 August 2010 10:48
		Re: JavaScriptCore By: mirek on Fri, 13 August 2010 11:30
		Re: JavaScriptCore By: mirek on Fri, 13 August 2010 11:30
		Re: JavaScriptCore By: cbpporter on Fri, 13 August 2010 11:36
		Re: JavaScriptCore By: cbpporter on Fri, 13 August 2010 15:28
		Re: JavaScriptCore By: cbpporter on Fri, 13 August 2010 16:30
		Re: JavaScriptCore By: jeremy_c on Sat, 14 August 2010 21:19
		Re: JavaScriptCore By: dolik.rce on Sat, 14 August 2010 23:40
		Re: JavaScriptCore By: cbpporter on Tue, 17 August 2010 09:29
		Re: JavaScriptCore By: cbpporter on Tue, 17 August 2010 10:05
		Re: JavaScriptCore By: dolik.rce on Tue, 17 August 2010 22:22

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