PatternMatching symbol for magic characters :-)
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- Subject: PatternMatching symbol for magic characters :-)
- From: "voidptr69@..." <voidptr69@...>
- Date: 2015年6月11日 16:15:03 -0400
hi from noob here :o)
I'm in Lua exploration, and I want to use its pattern matching.
Basically I read strings form a file and use that has pattern to scan
program code...
so here my suggestion ...
Can we have a "%m" symbol representing lua "magic" characters set ?
basically this "^$()%.[]*+-?"
so it will be more nice to scan my source file and put exception
characters in it.
and it will help writing more nice pattern when using in complex pattern
here a working example
s = "bla = bla(a[1]);"
for ss in s:gmatch("(%m)") do
print(ss)
end
I hacked lstrlib.c source file and changed 2 functions.
int ismagic(int c){
return( strchr("^$()%.[]*+-?", c) ? 1 : 0 );
}
static int match_class (int c, int cl) {
int res;
switch (tolower(cl)) {
case 'a' : res = isalpha(c); break;
case 'c' : res = iscntrl(c); break;
case 'd' : res = isdigit(c); break;
case 'g' : res = isgraph(c); break;
case 'l' : res = islower(c); break;
case 'p' : res = ispunct(c); break;
case 's' : res = isspace(c); break;
case 'u' : res = isupper(c); break;
case 'w' : res = isalnum(c); break;
case 'x' : res = isxdigit(c); break;
case 'm' : res = ismagic(c); break;
case 'z' : res = (c == 0); break; /* deprecated option */
default: return (cl == c);
}
return (islower(cl) ? res : !res);
}