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Task/URL-decoding/REXX/url-decoding-2.rexx

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+/*REXX pgm convert an URL─encoded string ──► its original unencoded form*/
+url.1 = 'http%3A%2F%2Ffoo%20bar%2F'
+url.2 = 'mailto%3A%22Ivan%20Aim%22%20%3Civan%2Eaim%40email%2Ecom%3E'
+url.3 = '%6D%61%69%6C%74%6F%3A%22%49%72%6D%61%20%55%73%65%72%22%20%3C%69%72%6D%61%2E%75%73%65%72%40%6D%61%69%6C%2E%63%6F%6D%3E'
+URLs=3
+            do j=1  for URLs
+            say url.j
+            say decodeURL(url.j)
+            say
+            end   /*j*/
+exit
+/*──────────────────────────────────DECODEURL subroutine────────────────*/
+decodeURL:  procedure;  parse arg encoded;     decoded=''
+encoded=translate(encoded,,'+')        /*special case for encoded blank.*/
+
+  do  while length(encoded)\==0
+  parse var encoded head '%' +1 code +2 tail
+  decoded=decoded || head
+
+                 select
+                 when length(strip(code,'T'))==2 &,
+                      datatype(code,'X') then decoded=decoded || x2c(code)
+                 when length(strip(code,'T'))\==0 then do
+                                                       decoded=decoded'%'
+                                                       tail=code || tail
+                                                       end
+                 otherwise nop
+                 end    /*select*/
+  encoded=tail
+  end   /*while*/
+
+return decoded