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string.m
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string.m
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string ; String Class
; Copyright (C) 2008 Etienne Cherdlu <80n80n@gmail.com>
;
; This program is free software: you can redistribute it and/or modify
; it under the terms of the GNU Affero General Public License as
; published by the Free Software Foundation, either version 3 of the
; License, or (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU Affero General Public License for more details.
;
; You should have received a copy of the GNU Affero General Public License
; along with this program. If not, see <http://www.gnu.org/licenses/>.
contains(string,substring,delimiter) ; Public ; Does string contain substring
;
q (delimiter_string_delimiter)[(delimiter_substring_delimiter)
upper(string) ; Public ; Convert string to upper case
q $tr(string,"abcdefghijklmnopqrstuvwxyz","ABCDEFGHIJKLMNOPQRSTUVWXYZ")
lower(string) ; Public ; Convert string to lower case
q $tr(string,"ABCDEFGHIJKLMNOPQRSTUVWXYZ","abcdefghijklmnopqrstuvwxyz")
toB64(txt) ; Public ; encode txt as base64
n result,char64,pos,triple,bytenum,bits
s result=""
s char64="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
f pos=1:3:$l(txt) d
. s triple=$e(txt,pos,pos+2)
. s bits=0
. f bytenum=1:1:$l(triple) s bits=bits*256+$a(triple,bytenum)
. i bytenum=3 s result=result_$e(char64,bits\262144+1)_$e(char64,bits\4096#64+1)_$e(char64,bits\64#64+1)_$e(char64,bits#64+1) q
. i bytenum=2 s bits=bits*4,result=result_$e(char64,bits\4096+1)_$e(char64,bits\64#64+1)_$e(char64,bits#64+1)_"=" q
. s bits=bits*16,result=result_$e(char64,bits\64+1)_$e(char64,bits#64+1)_"=="
q result
fromB64(txt) ; Public ; Decode txt from base64
n result,char64,pos,quad,bytenum,bits,worth
s result=""
s char64="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
f pos=1:4:$l(txt) d
. s quad=$e(txt,pos,pos+3)
. s bits=0
. f bytenum=1:1:$l(quad) d q:worth<0
. . s worth=$f(char64,$e(quad,bytenum))-2
. . q:worth<0
. . s bits=bits*64+worth
. i worth'<0 s result=result_$c(bits\65536,bits\256#256,bits#256) q
. i bytenum=4 s result=result_$c(bits\1024,bits\4#256) q
. i bytenum=3 s result=result_$c(bits\16) q
. n zer
. s zer="fromB64^%vc1str\Bad base64 input"
. d force^%vc9er
q result