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trim: allow to specify alternative trim class function

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This commit is contained in:
mfranz 2009-01-27 01:42:46 +00:00
parent dbd3cf8a5a
commit 14a928f391
1 changed files with 10 additions and 3 deletions
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13
Nasal/string.nas
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@ -20,17 +20,24 @@ var tolower = func(c) isupper(c) ? c + `a` - `A` : c;
##
# trim spaces at the left (lr < 0), at the right (lr > 0), or both (lr = 0)
# An optional function argument defines which characters should be trimmed:
#
var trim = func(s, lr = 0) {
# string.trim(a); # trim spaces
# string.trim(a, 1, string.isdigit); # trim digits at the right
# string.trim(a, 0, func(c) string.isspace(c) or c == `\n`); # trim spaces & \n
#
var trim = func(s, lr = 0, istrim = nil) {
if (istrim == nil)
istrim = isspace;
var l = 0;
if (lr <= 0)
for (; l < size(s); l += 1)
if (!isspace(s[l]))
if (!istrim(s[l]))
break;
var r = size(s) - 1;
if (lr >= 0)
for (; r >= 0; r -= 1)
if (!isspace(s[r]))
if (!istrim(s[r]))
break;
return r < l ? "" : substr(s, l, r - l + 1);
}