chore: make folder names match crate name

crates/aiken-lang/src/parser/extra.rs

@@ -0,0 +1,52 @@
+use crate::ast::Span;
+use std::iter::Peekable;
+
+#[derive(Debug, PartialEq, Eq, Default, Clone)]
+pub struct ModuleExtra {
+    pub module_comments: Vec<Span>,
+    pub doc_comments: Vec<Span>,
+    pub comments: Vec<Span>,
+    pub empty_lines: Vec<usize>,
+}
+
+impl ModuleExtra {
+    pub fn new() -> Self {
+        Default::default()
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct Comment<'a> {
+    pub start: usize,
+    pub content: &'a str,
+}
+
+impl<'a> From<(&Span, &'a str)> for Comment<'a> {
+    fn from(src: (&Span, &'a str)) -> Comment<'a> {
+        let start = src.0.start;
+        let end = src.0.end;
+        Comment {
+            start,
+            content: src.1.get(start..end).expect("From span to comment"),
+        }
+    }
+}
+
+pub fn comments_before<'a>(
+    comment_spans: &mut Peekable<impl Iterator<Item = &'a Span>>,
+    byte: usize,
+    src: &'a str,
+) -> Vec<&'a str> {
+    let mut comments = vec![];
+    while let Some(Span { start, .. }) = comment_spans.peek() {
+        if start <= &byte {
+            let comment = comment_spans
+                .next()
+                .expect("Comment before accessing next span");
+            comments.push(Comment::from((comment, src)).content)
+        } else {
+            break;
+        }
+    }
+    comments
+}