Add comment

src/comment.rs

@@ -0,0 +1,51 @@
+use nom::branch::*;
+use nom::bytes::complete::*;
+use nom::IResult;
+
+// -----------------------------------------------------------------------------
+
+#[derive(Debug)]
+pub struct Comment<'a> {
+    pub raw: Vec<&'a str>,
+}
+
+// -----------------------------------------------------------------------------
+
+pub fn comment(s: &str) -> IResult<&str, Comment> {
+    alt((one_line_comment, block_comment))(s)
+}
+
+pub fn one_line_comment(s: &str) -> IResult<&str, Comment> {
+    let (s, x) = tag("//")(s)?;
+    let (s, y) = is_not("\n")(s)?;
+    let raw = vec![x, y];
+    Ok((s, Comment { raw }))
+}
+
+pub fn block_comment(s: &str) -> IResult<&str, Comment> {
+    let (s, x) = tag("/*")(s)?;
+    let (s, y) = is_not("*/")(s)?;
+    let (s, z) = tag("*/")(s)?;
+    let raw = vec![x, y, z];
+    Ok((s, Comment { raw }))
+}
+
+// -----------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use nom::combinator::*;
+
+    #[test]
+    fn test() {
+        assert_eq!(
+            format!("{:?}", all_consuming(comment)("// comment")),
+            "Ok((\"\", Comment { raw: [\"//\", \" comment\"] }))"
+        );
+        assert_eq!(
+            format!("{:?}", all_consuming(comment)("/* comment\n\n */")),
+            "Ok((\"\", Comment { raw: [\"/*\", \" comment\\n\\n \", \"*/\"] }))"
+        );
+    }
+}

src/lib.rs

@@ -1,3 +1,4 @@
+pub mod comment;
 pub mod identifier;
 pub mod number;
 pub mod util;