parser

src/objects/snippet.rs

@@ -0,0 +1,65 @@
+#[cfg_attr(test, derive(PartialEq, Debug))]
+pub struct Snippet<'a> {
+    pub name: &'a str,
+    pub value: &'a str,
+}
+
+impl<'a> Snippet<'a> {
+    pub fn parse(src: &'a str) -> Option<(Snippet<'a>, usize)> {
+        starts_with!(src, "@@");
+
+        let name = until_while!(src, 2, b':', |c: u8| c.is_ascii_alphanumeric() || c == b'-');
+
+        if name == 2 {
+            return None;
+        }
+
+        let end = find!(src, name + 1, "@@");
+
+        Some((
+            Snippet {
+                name: &src[2..name],
+                value: &src[name + 1..end],
+            },
+            end + 2,
+        ))
+    }
+}
+
+#[test]
+fn parse() {
+    assert_eq!(
+        Snippet::parse("@@html:<b>@@").unwrap(),
+        (
+            Snippet {
+                name: "html",
+                value: "<b>"
+            },
+            "@@html:<b>@@".len()
+        )
+    );
+    assert_eq!(
+        Snippet::parse("@@latex:any arbitrary LaTeX code@@").unwrap(),
+        (
+            Snippet {
+                name: "latex",
+                value: "any arbitrary LaTeX code"
+            },
+            "@@latex:any arbitrary LaTeX code@@".len()
+        )
+    );
+    assert_eq!(
+        Snippet::parse("@@html:@@").unwrap(),
+        (
+            Snippet {
+                name: "html",
+                value: ""
+            },
+            "@@html:@@".len()
+        )
+    );
+    assert!(Snippet::parse("@@html:<b>@").is_none());
+    assert!(Snippet::parse("@html:<b>@@").is_none());
+    assert!(Snippet::parse("@@html<b>@@").is_none());
+    assert!(Snippet::parse("@@:<b>@@").is_none());
+}