Data commit

Task/URL-decoding/Rust/url-decoding.rust

@@ -0,0 +1,36 @@
+const INPUT1: &str = "http%3A%2F%2Ffoo%20bar%2F";
+const INPUT2: &str = "google.com/search?q=%60Abdu%27l-Bah%C3%A1";
+
+fn append_frag(text: &mut String, frag: &mut String) {
+    if !frag.is_empty() {
+        let encoded = frag.chars()
+            .collect::<Vec<char>>()
+            .chunks(2)
+            .map(|ch| {
+                u8::from_str_radix(&ch.iter().collect::<String>(), 16).unwrap()
+            }).collect::<Vec<u8>>();
+        text.push_str(&std::str::from_utf8(&encoded).unwrap());
+        frag.clear();
+    }
+}
+
+fn decode(text: &str) -> String {
+    let mut output = String::new();
+    let mut encoded_ch = String::new();
+    let mut iter = text.chars();
+    while let Some(ch) = iter.next() {
+        if ch == '%' {
+            encoded_ch.push_str(&format!("{}{}", iter.next().unwrap(), iter.next().unwrap()));
+        } else {
+            append_frag(&mut output, &mut encoded_ch);
+            output.push(ch);
+        }
+    }
+    append_frag(&mut output, &mut encoded_ch);
+    output
+}
+
+fn main() {
+    println!("{}", decode(INPUT1));
+    println!("{}", decode(INPUT2));
+}