Data commit

Task/URL-decoding/Wren/url-decoding.wren

@@ -0,0 +1,25 @@
+import "/fmt" for Conv
+
+var urlDecode = Fn.new { |enc|
+    var res = ""
+    var i = 0
+    while (i < enc.count) {
+        var c = enc[i]
+        if (c == "\%") {
+            var b = Conv.atoi(enc[i+1..i+2], 16)
+            res = res + String.fromByte(b)
+            i = i + 3
+        } else {
+            res = res + c
+            i = i + 1
+        }
+    }
+    return res
+}
+
+// We need to escape % characters in Wren as % is otherwise used for string interpolation.
+var encs = [
+    "http\%3A\%2F\%2Ffoo\%20bar\%2F",
+    "google.com/search?q=\%60Abdu\%27l-Bah\%C3\%A1"
+]
+for (enc in encs)System.print(urlDecode.call(enc))