cds-astro#9 syntactic sugar for reading card keywords

src/card.rs

@@ -1,3 +1,5 @@
+use std::{str, string::FromUtf8Error};
+
 use nom::{
     character::complete::{i64, space0},
     combinator::map,
@@ -19,6 +21,11 @@ impl Card {
     pub fn new(kw: Keyword, v: Value) -> Self {
         Self { kw, v }
     }
+    /// Return the ASCII trimmed keyword as an owned String.
+    pub fn keyword(&self) -> Result<String, FromUtf8Error> {
+        let kw = self.kw.trim_ascii().to_vec();
+        String::from_utf8(kw)
+    }
 }
 
 pub trait CardValue {
@@ -89,3 +96,16 @@ impl Value {
 pub(crate) fn parse_integer(buf: &[u8]) -> IResult<&[u8], Value> {
     preceded(space0, map(i64, |val| Value::Integer(val)))(buf)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{Card, Value};
+
+    #[test]
+    fn trimmed_keyword_string() {
+        let kw = b"GAIN    ".to_owned();
+        let v = Value::Float(30.00);
+        let card = Card { kw, v };
+        assert_eq!("GAIN".to_owned(), card.keyword().unwrap())
+    }
+}