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- Subject: Re: string.sub vs string.byte
- From: Adrian Sietsma <adrian_groups@...>
- Date: Tue, 27 Jul 2004 12:55:58 -0700
Ashwin Hirschi wrote:
As it turns out strsub is about 1.4 times slower than strbyte. I expect
Lua5 to give you approximately the same results. But you can easily test
this yourself.
i tried it both ways for real in my xml parser :
strsub version : total process time (100 x 29kb) was 5207 ms,
strbyte version : time = 5127 ms.
swings and roundabouts... i think what i gain with strbyte i lose with
"if ch == GT " as opposed to "if ch == '>' ". i could probably optimise
it further, but i have a c++ version for max speed anyway.
ps -
now that i've ported my parser to lua, does the wiki need yet another
xml parser? this one is a sax-type callback parser, which can
1/ parse (but not interpret) embedded DTD's
2/ handle html-type naked and value-less attributes
3/ handle html-type overlapping tags (sort-of)
i ported this because it is block-based, maintaining state between
calls, so you can parse an xml stream as a sequence of chunks.
approx 26 kb of source (not production quality, yet)
Adrian