Starting to learn Nom using Foamfiles

nomfoamtest/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
+[[package]]
+name = "nomfoamtest"
+version = "0.1.0"
+dependencies = [
+ "nom",
+]

nomfoamtest/Cargo.toml

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+[package]
+name = "nomfoamtest"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nom = "7.1.3"

nomfoamtest/src/foam.rs

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+//! Foam format parser.
+
+use std::str::FromStr;
+
+use nom::bytes::complete::is_not;
+use nom::bytes::complete::tag;
+use nom::bytes::complete::take_until;
+use nom::IResult;
+
+#[derive(Debug, Clone, PartialEq)]
+struct Comment {
+    comment: String,
+}
+
+impl FromStr for Comment {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(Self {
+            comment: s.trim().to_string(),
+        })
+    }
+}
+
+fn multiline_comment(input: &str) -> IResult<&str, Comment> {
+    let (input, _) = tag("/*")(input)?;
+    let (input, content) = take_until("*/")(input)?;
+    let (input, _) = tag("*/")(input)?;
+
+    Ok((input, Comment::from_str(content).unwrap()))
+}
+
+fn singleline_comment(input: &str) -> IResult<&str, Comment> {
+    let (input, _) = tag("//")(input)?;
+    let (input, content) = is_not("\n\r")(input)?;
+
+    Ok((input, Comment::from_str(content).unwrap()))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_multiline_comment() {
+        let text = "/* this is comment */";
+        let result = multiline_comment(text);
+        assert_eq!(
+            result,
+            Ok((
+                "",
+                Comment {
+                    comment: "this is comment".to_string()
+                }
+            ))
+        )
+    }
+
+    #[test]
+    fn test_singleline_comment() {
+        let text = "// this is comment";
+        let result = singleline_comment(text);
+        assert_eq!(
+            result,
+            Ok((
+                "",
+                Comment {
+                    comment: "this is comment".to_string()
+                }
+            ))
+        )
+    }
+}

nomfoamtest/src/main.rs

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+mod foam;
+
+fn main() {
+    println!("Hello, world!");
+}