Initial data commit

Task/URL-encoding/11l/url-encoding.11l

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+F url_encode(s)
+   V r = ‘’
+   V buf = ‘’
+
+   F flush_buf() // this function is needed because strings in 11l are UTF-16 encoded
+      I @buf != ‘’
+         V bytes = @buf.encode(‘utf-8’)
+         L(b) bytes
+            @r ‘’= ‘%’hex(b).zfill(2)
+         @buf = ‘’
+
+   L(c) s
+      I c C (‘0’..‘9’, ‘a’..‘z’, ‘A’..‘Z’, ‘_’, ‘.’, ‘-’, ‘~’)
+         flush_buf()
+         r ‘’= c
+      E
+         buf ‘’= c
+
+   flush_buf()
+   R r
+
+print(url_encode(‘http://foo bar/’))
+print(url_encode(‘https://ru.wikipedia.org/wiki/Транспайлер’))