Fix issue with repeating {{ else }} blocks

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

src/ast/mod.rs

@@ -345,39 +345,67 @@ fn parse_conditional_chain<'input>(
 
         chain.push(if_block);
 
-        loop {
-            let (content, end_block): (Vec<_>, _) = repeat_till(
-                0..,
-                parse_ast,
-                trace(
-                    "conditional_chain_else/end",
-                    alt((parse_end, parse_conditional_else)),
-                ),
-            )
-            .parse_next(input)?;
+        let content = resume_after_cut(
+            inner_conditional_chain,
+            repeat_till(0.., any, parse_end).map(|((), _)| ()),
+        )
+        .parse_next(input)?;
 
-            chain.push(TemplateAstExpr::ConditionalContent { content });
-
-            let is_end = if let TemplateAstExpr::Block { ref expression, .. } = end_block
-                && let TemplateAstExpr::EndBlock = &**expression
-            {
-                true
-            } else {
-                false
-            };
-
-            chain.push(end_block);
-
-            if is_end {
-                break;
-            }
-        }
+        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..,
+            parse_ast,
+            trace(
+                "conditional_chain_else/end",
+                alt((parse_end, parse_conditional_else)),
+            ),
+        )
+        .parse_next(input)?;
+
+        chain.push(TemplateAstExpr::ConditionalContent { content });
+
+        let is_end = if let TemplateAstExpr::Block { ref expression, .. } = end_block
+            && let TemplateAstExpr::EndBlock = &**expression
+        {
+            true
+        } else {
+            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 {
+            break;
+        }
+    }
+
+    Ok(chain)
+}
+
 fn parse_conditional_if<'input>(
     input: &mut Input<'input>,
 ) -> Result<TemplateAstExpr<'input>, AstError> {

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 }}