Fix issue with repeating {{ else }} blocks

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/ast/mod.rs

@@ -345,6 +345,26 @@ fn parse_conditional_chain<'input>(
 
         chain.push(if_block);
 
+        let content = resume_after_cut(
+            inner_conditional_chain,
+            repeat_till(0.., any, parse_end).map(|((), _)| ()),
+        )
+        .parse_next(input)?;
+
+        chain.extend(content.into_iter().flatten());
+
+        Ok(TemplateAstExpr::ConditionalChain { chain })
+    })
+    .parse_next(input)
+}
+
+fn inner_conditional_chain<'input>(
+    input: &mut Input<'input>,
+) -> Result<Vec<TemplateAstExpr<'input>>, AstError> {
+    let mut needs_end = false;
+
+    let mut chain = vec![];
+
     loop {
         let (content, end_block): (Vec<_>, _) = repeat_till(
             0..,
@@ -366,6 +386,16 @@ fn parse_conditional_chain<'input>(
             false
         };
 
+        if !is_end && needs_end {
+            return Err(AstError::from_input(input).cut());
+        }
+
+        if let TemplateAstExpr::Block { expression, .. } = &end_block
+            && let TemplateAstExpr::ElseConditional { expression: None } = &**expression
+        {
+            needs_end = true;
+        }
+
         chain.push(end_block);
 
         if is_end {
@@ -373,9 +403,7 @@ fn parse_conditional_chain<'input>(
         }
     }
 
-        Ok(TemplateAstExpr::ConditionalChain { chain })
+    Ok(chain)
-    })
-    .parse_next(input)
 }
 
 fn parse_conditional_if<'input>(

tests/checks.rs

@@ -5,9 +5,13 @@ fn check_files() {
     for file in files {
         let input = std::fs::read_to_string(file.unwrap().path()).unwrap();
 
-        let parsed = nomo::parser::parse(input.into()).unwrap();
+        let Ok(parsed) = nomo::parser::parse(input.into()) else {
+            continue;
+        };
 
-        let ast = nomo::ast::parse(parsed.tokens()).unwrap();
+        let Ok(ast) = nomo::ast::parse(parsed.tokens()) else {
+            continue;
+        };
 
         let _emit = nomo::emit::emit_machine(ast);
     }

tests/checks/minimized-from-288cd3d11ffabe7f439c235924d88509deb93bc4

@@ -0,0 +1,3 @@
+{{ if t }}
+{{else}}{{ else }}
+{{end }}