Expose the YAML frontmatter body in the grammar so a --- inside a value cannot truncate the metadata

crates/pampa/snapshots/json/002.snap

@@ -2,4 +2,4 @@
 source: crates/pampa/tests/integration/test.rs
 expression: output
 ---
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crates/pampa/snapshots/json/003.snap

@@ -2,4 +2,4 @@
 source: crates/pampa/tests/integration/test.rs
 expression: output
 ---
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crates/pampa/snapshots/json/horizontal-rules-vs-metadata.snap

@@ -2,4 +2,4 @@
 source: crates/pampa/tests/integration/test.rs
 expression: output
 ---
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crates/pampa/snapshots/json/yaml-tags.snap

@@ -2,4 +2,4 @@
 source: crates/pampa/tests/integration/test.rs
 expression: output
 ---
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crates/pampa/src/pandoc/meta.rs

@@ -564,16 +564,14 @@ fn content_provenance_desync_warning(
     .build()
 }
 
-fn extract_between_delimiters(input: &str) -> Option<&str> {
-    let parts: Vec<&str> = input.split("---").collect();
-    if parts.len() >= 3 {
-        Some(parts[1].trim())
-    } else {
-        None
-    }
-}
-
-/// Convert RawBlock to ConfigValue using unified conversion.
+/// Convert a `quarto_minus_metadata` RawBlock to ConfigValue using unified conversion.
+///
+/// The block's `text` is the YAML between the `---` delimiters — exactly the
+/// grammar's `yaml` body node, delimiter lines excluded — and its
+/// `source_info` covers that same range, so YAML offsets map onto the source
+/// with no re-scanning here. (The reader once located the body itself by
+/// splitting the raw node text on `---`, which cut the YAML at the first
+/// `---` inside a value: bd-mjo6ao32, GH #671.)
 ///
 /// This function:
 /// 1. Preserves source location information
@@ -582,8 +580,7 @@ fn extract_between_delimiters(input: &str) -> Option<&str> {
 ///
 /// # Panics
 ///
-/// Panics if the RawBlock format is not "quarto_minus_metadata" or if YAML parsing fails.
-/// These should be replaced with proper error handling in production.
+/// Panics if the RawBlock format is not "quarto_minus_metadata".
 pub fn rawblock_to_config_value(
     block: &RawBlock,
     diagnostics: &mut crate::utils::diagnostic_collector::DiagnosticCollector,
@@ -595,23 +592,11 @@ pub fn rawblock_to_config_value(
         );
     }
 
-    // Extract YAML content between --- delimiters
-    let content = extract_between_delimiters(&block.text).unwrap();
-
-    // Calculate offsets within RawBlock.text
-    // Find the actual position of the trimmed content in the original text
-    // extract_between_delimiters trims the content, so we need to find where it actually starts
-    let yaml_start = block.text.find(content).unwrap();
-
-    // block.source_info is already quarto_source_map::SourceInfo
-    let parent = block.source_info.clone();
-
-    // Create Substring SourceInfo for the YAML content within the RawBlock
-    let yaml_parent =
-        quarto_source_map::SourceInfo::substring(parent, yaml_start, yaml_start + content.len());
+    // The block's source_info already spans exactly the YAML text.
+    let yaml_parent = block.source_info.clone();
 
     // Parse YAML with source tracking
-    let yaml = match quarto_yaml::parse_with_parent(content, yaml_parent.clone()) {
+    let yaml = match quarto_yaml::parse_with_parent(&block.text, yaml_parent.clone()) {
         Ok(y) => y,
         Err(e) => {
             // Report the YAML parse error as a diagnostic
@@ -651,33 +636,6 @@ mod tests {
         quarto_source_map::SourceInfo::for_test()
     }
 
-    #[test]
-    fn test_extract_between_delimiters_valid() {
-        let input = "---\ntitle: Test\n---";
-        let result = extract_between_delimiters(input);
-        assert_eq!(result, Some("title: Test"));
-    }
-
-    #[test]
-    fn test_extract_between_delimiters_with_extra_content() {
-        let input = "---\ntitle: Test\n---\nBody text";
-        let result = extract_between_delimiters(input);
-        assert_eq!(result, Some("title: Test"));
-    }
-
-    #[test]
-    fn test_extract_between_delimiters_missing_delimiters() {
-        // Only one delimiter
-        let input = "---\ntitle: Test";
-        let result = extract_between_delimiters(input);
-        assert_eq!(result, None);
-
-        // No delimiters
-        let input = "title: Test";
-        let result = extract_between_delimiters(input);
-        assert_eq!(result, None);
-    }
-
     #[test]
     fn test_yaml_to_config_value_string_document_metadata() {
         // .with_content_provenance(si()): a hand-built node derives no

crates/pampa/src/pandoc/treesitter.rs

@@ -338,12 +338,15 @@ fn process_list_item(
             // the item contains a heading (e.g. `* # Section 1`). Flatten the
             // section's blocks into the item, mirroring `process_section`.
             PandocNativeIntermediate::IntermediateSection(section) => blocks.extend(section),
-            PandocNativeIntermediate::IntermediateMetadataString(text, _range) => {
+            PandocNativeIntermediate::IntermediateMetadataString(text, range) => {
                 // for now we assume it's metadata and emit it as a rawblock
                 blocks.push(Block::RawBlock(RawBlock {
                     format: "quarto_minus_metadata".to_string(),
                     text,
-                    source_info: node_source_info_with_context(list_item_node, context),
+                    source_info: quarto_source_map::SourceInfo::from_range(
+                        context.current_file_id(),
+                        range,
+                    ),
                 }));
             }
             // Tokens with no AST-level meaning: tree-sitter ERROR nodes from
@@ -699,9 +702,21 @@ fn native_visitor<T: Write>(
         "fenced_div_note_id" => create_base_text_from_node_text(node, input_bytes),
         "document" => process_document(node, children, context),
         "metadata" => {
-            // Extract YAML frontmatter text
-            let text = node.utf8_text(input_bytes).unwrap().to_string();
-            PandocNativeIntermediate::IntermediateMetadataString(text, node_location(node))
+            // The grammar exposes the YAML between the `---` delimiters as
+            // the `body` field (a `yaml` node), so the text and range come
+            // straight from the parse — never re-derived from the node text,
+            // which is how a `---` inside a value once truncated the
+            // metadata (bd-mjo6ao32, GH #671). A `metadata` node without a
+            // body only arises from error recovery; the parse error is
+            // already reported, so treat it as an empty block.
+            let (text, range) = match node.child_by_field_name("body") {
+                Some(body) => (
+                    body.utf8_text(input_bytes).unwrap().to_string(),
+                    node_location(&body),
+                ),
+                None => (String::new(), node_location(node)),
+            };
+            PandocNativeIntermediate::IntermediateMetadataString(text, range)
         }
         "section" => process_section(node, children, context),
         "pandoc_paragraph" => process_paragraph(node, children, input_bytes, context),

crates/pampa/tests/integration/main.rs

@@ -49,6 +49,7 @@ pub mod test_emphasis_opening_mark;
 pub mod test_error_corpus;
 pub mod test_fenced_div_no_space;
 pub mod test_figure_figcaption_synthesis;
+pub mod test_frontmatter_delimiters;
 pub mod test_grid_table_error;
 pub mod test_hard_soft_break;
 pub mod test_heading_auto_id;