Refactor comment escaping.

jaq-core/src/load/lex.rs

@@ -141,20 +141,21 @@ impl<'a> Lexer<&'a str> {
 
     /// Whitespace and comments.
     fn space(&mut self) {
-        // did the previous line contain a comment ending with an odd number of backslashes?
-        let mut backslash = false;
-        self.i = self.i.trim_start();
-        while let Some(comment) = core::mem::take(&mut backslash)
-            .then_some(self.i)
-            .or_else(|| self.i.strip_prefix('#'))
-        {
-            let (before, after) = comment.split_once('\n').unwrap_or((comment, ""));
-            let before = before.strip_suffix('\r').unwrap_or(before);
-            self.i = after;
-            if before.chars().rev().take_while(|c| *c == '\\').count() % 2 == 1 {
-                backslash = true;
-            } else {
-                self.i = self.i.trim_start()
+        loop {
+            self.i = self.i.trim_start();
+            match self.i.strip_prefix('#') {
+                Some(comment) => self.i = comment,
+                None => break,
+            }
+            // ignore all lines that end with an odd number of backslashes
+            loop {
+                let (before, after) = self.i.split_once('\n').unwrap_or((self.i, ""));
+                let before = before.strip_suffix('\r').unwrap_or(before);
+                self.i = after;
+                // does the line end with an even number of backslashes?
+                if before.chars().rev().take_while(|c| *c == '\\').count() % 2 == 0 {
+                    break;
+                }
             }
         }
     }