refactor: prune block transform helpers

rust/spikes/leptos-tiptap-spike/src/editor_runtime/block_menu_document.rs

@@ -1,6 +1,6 @@
 //! block menu 使用的顶层块 JSON helper。
 
-use serde_json::{json, Value};
+use serde_json::{json, Map, Value};
 
 use crate::editor_runtime::block_hover_state::DropPlacement;
 
@@ -65,6 +65,57 @@ pub(crate) fn reorder_top_level_block(
     Ok(())
 }
 
+fn node_with_attrs(
+    type_name: &str,
+    attrs: Option<Map<String, Value>>,
+    content: Vec<Value>,
+) -> Value {
+    let mut node = Map::new();
+    node.insert("type".to_string(), Value::String(type_name.to_string()));
+    if let Some(attrs) = attrs.filter(|attrs| !attrs.is_empty()) {
+        node.insert("attrs".to_string(), Value::Object(attrs));
+    }
+    if !content.is_empty() {
+        node.insert("content".to_string(), Value::Array(content));
+    }
+    Value::Object(node)
+}
+
+pub(crate) fn paragraph_node(content: Vec<Value>) -> Value {
+    node_with_attrs("paragraph", None, content)
+}
+
+pub(crate) fn collect_plain_text(node: &Value) -> String {
+    match node.get("type").and_then(Value::as_str) {
+        Some("text") => node
+            .get("text")
+            .and_then(Value::as_str)
+            .unwrap_or_default()
+            .to_string(),
+        Some("hardBreak") => "\n".to_string(),
+        _ => node
+            .get("content")
+            .and_then(Value::as_array)
+            .map(|children| {
+                children
+                    .iter()
+                    .map(collect_plain_text)
+                    .collect::<Vec<_>>()
+                    .join("")
+            })
+            .unwrap_or_default(),
+    }
+}
+
+pub(crate) fn mindmap_paragraph_node(next_mindmap_id: impl FnOnce() -> String) -> Value {
+    let mut attrs = Map::new();
+    attrs.insert("mnoteBlockType".to_string(), json!("mindmap"));
+    attrs.insert("mindmapId".to_string(), json!(next_mindmap_id()));
+    attrs.insert("rootNodeId".to_string(), json!("root"));
+    attrs.insert("projectionVersion".to_string(), json!(1));
+    node_with_attrs("paragraph", Some(attrs), Vec::new())
+}
+
 #[cfg(test)]
 mod tests {
     use serde_json::json;