parser

src/objects/cookie.rs

@@ -0,0 +1,67 @@
+#[cfg_attr(test, derive(PartialEq, Debug))]
+pub struct Cookie<'a> {
+    value: &'a str,
+}
+
+impl<'a> Cookie<'a> {
+    pub fn parse(src: &'a str) -> Option<(Cookie<'a>, usize)> {
+        starts_with!(src, '[');
+
+        let num1 = until_while!(src, 1, |c| c == b'%' || c == b'/', |c: u8| c
+            .is_ascii_digit());
+
+        if src.len() > num1 && src.as_bytes()[num1 + 1] == b']' {
+            Some((
+                Cookie {
+                    value: &src[0..num1 + 2],
+                },
+                num1 + 2,
+            ))
+        } else {
+            let num2 = until_while!(src, num1 + 1, b']', |c: u8| c.is_ascii_digit());
+            Some((
+                Cookie {
+                    value: &src[0..=num2],
+                },
+                num2 + 1,
+            ))
+        }
+    }
+}
+
+#[test]
+fn parse() {
+    assert_eq!(
+        Cookie::parse("[1/10]").unwrap(),
+        (Cookie { value: "[1/10]" }, "[1/10]".len())
+    );
+    assert_eq!(
+        Cookie::parse("[1/1000]").unwrap(),
+        (Cookie { value: "[1/1000]" }, "[1/1000]".len())
+    );
+    assert_eq!(
+        Cookie::parse("[10%]").unwrap(),
+        (Cookie { value: "[10%]" }, "[10%]".len())
+    );
+    assert_eq!(
+        Cookie::parse("[%]").unwrap(),
+        (Cookie { value: "[%]" }, "[%]".len())
+    );
+    assert_eq!(
+        Cookie::parse("[/]").unwrap(),
+        (Cookie { value: "[/]" }, "[/]".len())
+    );
+    assert_eq!(
+        Cookie::parse("[100/]").unwrap(),
+        (Cookie { value: "[100/]" }, "[100/]".len())
+    );
+    assert_eq!(
+        Cookie::parse("[/100]").unwrap(),
+        (Cookie { value: "[/100]" }, "[/100]".len())
+    );
+
+    assert!(Cookie::parse("[10% ]").is_none(),);
+    assert!(Cookie::parse("[1//100]").is_none(),);
+    assert!(Cookie::parse("[1\\100]").is_none(),);
+    assert!(Cookie::parse("[10%%]").is_none(),);
+}