chore(leptos_hot_reload): apply lints suggestions (#1735)

leptos_hot_reload/src/diff.rs

@@ -6,6 +6,7 @@ use serde::{Deserialize, Serialize};
 struct OldChildren(IndexMap<LNode, Vec<usize>>);
 
 impl LNode {
+    #[must_use]
     pub fn diff(&self, other: &LNode) -> Vec<Patch> {
         let mut old_children = OldChildren::default();
         self.add_old_children(vec![], &mut old_children);
@@ -196,7 +197,7 @@ impl LNode {
                 if replace {
                     match &new_value {
                         LAttributeValue::Boolean => {
-                            Some((name.to_owned(), "".to_string()))
+                            Some((name.to_owned(), String::new()))
                         }
                         LAttributeValue::Static(s) => {
                             Some((name.to_owned(), s.to_owned()))
@@ -213,13 +214,13 @@ impl LNode {
             });
 
         let removals = old.iter().filter_map(|(name, _)| {
-            if !new.iter().any(|(new_name, _)| new_name == name) {
+            if new.iter().any(|(new_name, _)| new_name == name) {
+                None
+            } else {
                 Some(Patch {
                     path: path.to_owned(),
                     action: PatchAction::RemoveAttribute(name.to_owned()),
                 })
-            } else {
-                None
             }
         });
 
@@ -259,7 +260,6 @@ impl LNode {
                 let new = new.get(a);
 
                 match (old, new) {
-                    (None, None) => {}
                     (None, Some(new)) => patches.push(Patch {
                         path: path.to_owned(),
                         action: PatchAction::InsertChild {
@@ -271,11 +271,10 @@ impl LNode {
                         path: path.to_owned(),
                         action: PatchAction::RemoveChild { at: a },
                     }),
-                    (Some(old), Some(new)) => {
-                        if old != new {
-                            break;
-                        }
+                    (Some(old), Some(new)) if old != new => {
+                        break;
                     }
+                    _ => {}
                 }
 
                 a += 1;
@@ -287,7 +286,6 @@ impl LNode {
                 let new = new.get(b);
 
                 match (old, new) {
-                    (None, None) => {}
                     (None, Some(new)) => patches.push(Patch {
                         path: path.to_owned(),
                         action: PatchAction::InsertChildAfter {
@@ -299,18 +297,16 @@ impl LNode {
                         path: path.to_owned(),
                         action: PatchAction::RemoveChild { at: b },
                     }),
-                    (Some(old), Some(new)) => {
-                        if old != new {
-                            break;
-                        }
+                    (Some(old), Some(new)) if old != new => {
+                        break;
                     }
+                    _ => {}
                 }
 
                 if b == 0 {
                     break;
-                } else {
-                    b -= 1;
                 }
+                b -= 1;
             }
 
             // diffing in middle

leptos_hot_reload/src/lib.rs

@@ -33,10 +33,14 @@ pub struct ViewMacros {
 }
 
 impl ViewMacros {
+    #[must_use]
     pub fn new() -> Self {
         Self::default()
     }
 
+    /// # Errors
+    ///
+    /// Will return `Err` if the path is not UTF-8 path or the contents of the file cannot be parsed.
     pub fn update_from_paths<T: AsRef<Path>>(&self, paths: &[T]) -> Result<()> {
         let mut views = HashMap::new();
 
@@ -59,6 +63,9 @@ impl ViewMacros {
         Ok(())
     }
 
+    /// # Errors
+    ///
+    /// Will return `Err` if the contents of the file cannot be parsed.
     pub fn parse_file(path: &Utf8PathBuf) -> Result<Vec<MacroInvocation>> {
         let mut file = File::open(path)?;
         let mut content = String::new();
@@ -76,11 +83,14 @@ impl ViewMacros {
             let rsx =
                 rstml::parse2(tokens.collect::<proc_macro2::TokenStream>())?;
             let template = LNode::parse_view(rsx)?;
-            views.push(MacroInvocation { id, template })
+            views.push(MacroInvocation { id, template });
         }
         Ok(views)
     }
 
+    /// # Errors
+    ///
+    /// Will return `Err` if the contents of the file cannot be parsed.
     pub fn patch(&self, path: &Utf8PathBuf) -> Result<Option<Patches>> {
         let new_views = Self::parse_file(path)?;
         let mut lock = self.views.write();
@@ -125,7 +135,7 @@ impl std::fmt::Debug for MacroInvocation {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("MacroInvocation")
             .field("id", &self.id)
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 
@@ -136,7 +146,7 @@ pub struct ViewMacroVisitor<'a> {
 
 impl<'ast> Visit<'ast> for ViewMacroVisitor<'ast> {
     fn visit_macro(&mut self, node: &'ast Macro) {
-        let ident = node.path.get_ident().map(|n| n.to_string());
+        let ident = node.path.get_ident().map(ToString::to_string);
         if ident == Some("view".to_string()) {
             self.views.push(node);
         }

leptos_hot_reload/src/node.rs

@@ -9,6 +9,7 @@ use serde::{Deserialize, Serialize};
 // `syn` types are `!Send` so we can't store them as we might like.
 // This is only used to diff view macros for hot reloading so it's very minimal
 // and ignores many of the data types.
+#[allow(clippy::module_name_repetitions)]
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub enum LNode {
     Fragment(Vec<LNode>),
@@ -38,18 +39,26 @@ pub enum LAttributeValue {
 }
 
 impl LNode {
+    /// # Errors
+    ///
+    /// Will return `Err` if parsing the view fails.
     pub fn parse_view(nodes: Vec<Node>) -> Result<LNode> {
         let mut out = Vec::new();
         for node in nodes {
             LNode::parse_node(node, &mut out)?;
         }
         if out.len() == 1 {
-            Ok(out.pop().unwrap())
+            out.pop().ok_or_else(|| {
+                unreachable!("The last element should not be None.")
+            })
         } else {
             Ok(LNode::Fragment(out))
         }
     }
 
+    /// # Errors
+    ///
+    /// Will return `Err` if parsing the node fails.
     pub fn parse_node(node: Node, views: &mut Vec<LNode>) -> Result<()> {
         match node {
             Node::Fragment(frag) => {
@@ -61,9 +70,9 @@ impl LNode {
                 views.push(LNode::Text(text.value_string()));
             }
             Node::Block(block) => {
-                let code = block.into_token_stream();
-                let code = code.to_string();
-                views.push(LNode::DynChild(code));
+                views.push(LNode::DynChild(
+                    block.into_token_stream().to_string(),
+                ));
             }
             Node::Element(el) => {
                 if is_component_node(&el) {
@@ -83,7 +92,7 @@ impl LNode {
                                     attr.key.to_string(),
                                     format!("{:#?}", attr.value()),
                                 )),
-                                _ => None,
+                                NodeAttribute::Block(_) => None,
                             })
                             .collect(),
                         children,
@@ -151,8 +160,9 @@ impl LNode {
                         LAttributeValue::Static(value) => {
                             Some(format!("{name}=\"{value}\" "))
                         }
-                        LAttributeValue::Dynamic => None,
-                        LAttributeValue::Noop => None,
+                        LAttributeValue::Dynamic | LAttributeValue::Noop => {
+                            None
+                        }
                     })
                     .collect::<String>();
 

leptos_hot_reload/src/parsing.rs

@@ -1,6 +1,5 @@
 use rstml::node::{NodeElement, NodeName};
 
-///
 /// Converts `syn::Block` to simple expression
 ///
 /// For example:
@@ -14,6 +13,7 @@ use rstml::node::{NodeElement, NodeName};
 /// // variable
 /// {path::x}
 /// ```
+#[must_use]
 pub fn block_to_primitive_expression(block: &syn::Block) -> Option<&syn::Expr> {
     // its empty block, or block with multi lines
     if block.stmts.len() != 1 {
@@ -29,6 +29,7 @@ pub fn block_to_primitive_expression(block: &syn::Block) -> Option<&syn::Expr> {
 ///
 /// This function doesn't convert literal wrapped inside block
 /// like: `{"string"}`.
+#[must_use]
 pub fn value_to_string(value: &syn::Expr) -> Option<String> {
     match &value {
         syn::Expr::Lit(lit) => match &lit.lit {
@@ -42,6 +43,10 @@ pub fn value_to_string(value: &syn::Expr) -> Option<String> {
     }
 }
 
+/// # Panics
+///
+/// Will panic if the last element does not exist in the path.
+#[must_use]
 pub fn is_component_tag_name(name: &NodeName) -> bool {
     match name {
         NodeName::Path(path) => {
@@ -55,11 +60,11 @@ pub fn is_component_tag_name(name: &NodeName) -> bool {
                     .to_string()
                     .starts_with(|c: char| c.is_ascii_uppercase())
         }
-        NodeName::Block(_) => false,
-        NodeName::Punctuated(_) => false,
+        NodeName::Block(_) | NodeName::Punctuated(_) => false,
     }
 }
 
+#[must_use]
 pub fn is_component_node(node: &NodeElement) -> bool {
     is_component_tag_name(node.name())
 }