feat: dynamic block parsing

src/elements/dyn_block.rs

@@ -0,0 +1,50 @@
+#[cfg_attr(test, derive(PartialEq, Debug))]
+pub struct DynBlock<'a> {
+    pub name: &'a str,
+    pub para: &'a str,
+}
+
+impl<'a> DynBlock<'a> {
+    pub fn parse(src: &'a str) -> Option<(DynBlock<'a>, usize, usize)> {
+        if src.len() < 17 || !src[0..9].eq_ignore_ascii_case("#+BEGIN: ") {
+            return None;
+        }
+
+        let args = eol!(src);
+        let name = until_while!(src, 9, |c| c == b' ' || c == b'\n', |c: u8| c
+            .is_ascii_alphabetic());
+        // TODO: ignore case matching
+        let content = src.find("\n#+END:")?;
+        let end = eol!(src, content + 1);
+
+        Some((
+            DynBlock {
+                name: &src[9..name],
+                para: &src[name..args].trim(),
+            },
+            content,
+            end,
+        ))
+    }
+}
+
+#[test]
+fn parse() {
+    // TODO: testing
+    assert_eq!(
+        DynBlock::parse(
+            r"#+BEGIN: clocktable :scope file :block yesterday
+CONTENTS
+#+END:
+"
+        ),
+        Some((
+            DynBlock {
+                name: "clocktable",
+                para: ":scope file :block yesterday"
+            },
+            57,
+            64
+        ))
+    )
+}