feat: pre_blank and post_blank

src/elements/fixed_width.rs

@@ -0,0 +1,63 @@
+use std::borrow::Cow;
+
+use crate::parsers::{blank_lines, take_lines_while};
+
+#[derive(Debug, Default)]
+#[cfg_attr(test, derive(PartialEq))]
+#[cfg_attr(feature = "ser", derive(serde::Serialize))]
+pub struct FixedWidth<'a> {
+    pub value: Cow<'a, str>,
+    pub post_blank: usize,
+}
+
+impl FixedWidth<'_> {
+    pub(crate) fn parse(input: &str) -> Option<(&str, FixedWidth<'_>)> {
+        let (input, value) = take_lines_while(|line| line == ":" || line.starts_with(": "))(input);
+        let (input, blank) = blank_lines(input);
+
+        if value.is_empty() {
+            return None;
+        }
+
+        Some((
+            input,
+            FixedWidth {
+                value: value.into(),
+                post_blank: blank,
+            },
+        ))
+    }
+
+    pub fn into_owned(self) -> FixedWidth<'static> {
+        FixedWidth {
+            value: self.value.into_owned().into(),
+            post_blank: self.post_blank,
+        }
+    }
+}
+
+#[test]
+fn parse() {
+    assert_eq!(
+        FixedWidth::parse(
+            r#": A
+:
+: B
+: C
+
+"#
+        ),
+        Some((
+            "",
+            FixedWidth {
+                value: r#": A
+:
+: B
+: C
+"#
+                .into(),
+                post_blank: 1
+            }
+        ))
+    );
+}