[#36] Add parse_struct_field()

macro_ui/src/lib.rs

@@ -110,6 +110,7 @@ fn visit_enum_variants(data: &DataEnum) -> TokenStream2 {
 
 fn handle_struct(name: &Ident, fields: &FieldsNamed) -> TokenStream2 {
     let visited_fields: TokenStream2 = fields.named.iter().map(visit_struct_field).collect();
+    let parsed_fields: TokenStream2 = fields.named.iter().map(parse_struct_field).collect();
 
     quote! {
         #[automatically_derived]
@@ -128,7 +129,9 @@ fn handle_struct(name: &Ident, fields: &FieldsNamed) -> TokenStream2 {
         impl #name {
             fn parse(parser: &dyn UiParser, path: &str, spaces: &str) -> #name {
                 println!("{}Parse struct {} with path '{}'", spaces, stringify!(#name), path);
-                #name::default()
+                Self {
+                    #parsed_fields
+                }
             }
         }
     }
@@ -152,6 +155,18 @@ fn visit_struct_field(field: &Field) -> TokenStream2 {
     }
 }
 
+fn parse_struct_field(field: &Field) -> TokenStream2 {
+    let field_name = &field.ident;
+
+    if is_integer(field) {
+        quote! {
+            #field_name: parser.parse_u32(&format!("{}.{}", path, stringify!(#field_name))),
+        }
+    } else {
+        quote! {}
+    }
+}
+
 fn visit_tuple_field(field: &Field, field_name: &str) -> TokenStream2 {
     if is_integer(field) {
         quote! {

rpg_tools_core/src/ui/parser.rs

@@ -1,4 +1,12 @@
 pub trait UiParser {
     /// Parse a string from a path.
-    fn get_str<'a>(&self, name: &str) -> &'a str;
-}
+    fn get_str<'a>(&self, name: &str) -> Option<&'a str>;
+
+    /// Parse an integer from a path.
+    fn parse_u32(&self, path: &str) -> Option<u32> {
+        self.get_str(path)
+            .iter()
+            .flat_map(|s| s.parse::<u32>().ok())
+            .next()
+    }
+}