WIP: Complete work of propfind parsing

crates/xml/derive/src/xml_enum/impl_de.rs

@@ -0,0 +1,64 @@
+use crate::Variant;
+
+use super::Enum;
+use quote::quote;
+
+impl Enum {
+    fn impl_de_untagged(&self) -> proc_macro2::TokenStream {
+        let (impl_generics, type_generics, where_clause) = self.generics.split_for_impl();
+        let name = &self.ident;
+
+        let variant_branches = self
+            .variants
+            .iter()
+            .filter_map(|variant| variant.untagged_branch());
+
+        quote! {
+            impl #impl_generics ::rustical_xml::XmlDeserialize for #name #type_generics #where_clause {
+                fn deserialize<R: ::std::io::BufRead>(
+                    reader: &mut quick_xml::NsReader<R>,
+                    start: &quick_xml::events::BytesStart,
+                    empty: bool
+                ) -> Result<Self, rustical_xml::XmlError> {
+                    #(#variant_branches);*
+
+                    Err(rustical_xml::XmlError::InvalidVariant("could not match".to_owned()))
+                }
+            }
+        }
+    }
+
+    fn impl_de_tagged(&self) -> proc_macro2::TokenStream {
+        let (impl_generics, type_generics, where_clause) = self.generics.split_for_impl();
+        let name = &self.ident;
+
+        let variant_branches = self.variants.iter().filter_map(Variant::tagged_branch);
+
+        quote! {
+            impl #impl_generics ::rustical_xml::XmlDeserialize for #name #type_generics #where_clause {
+                fn deserialize<R: std::io::BufRead>(
+                    reader: &mut quick_xml::NsReader<R>,
+                    start: &quick_xml::events::BytesStart,
+                    empty: bool
+                ) -> Result<Self, rustical_xml::XmlError> {
+                    let (_ns, name) = reader.resolve_element(start.name());
+
+                    match name.as_ref() {
+                        #(#variant_branches),*
+                        name => {
+                            // Handle invalid variant name
+                            Err(rustical_xml::XmlError::InvalidVariant(String::from_utf8_lossy(name).to_string()))
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    pub fn impl_de(&self) -> proc_macro2::TokenStream {
+        match self.attrs.untagged.is_present() {
+            true => self.impl_de_untagged(),
+            false => self.impl_de_tagged(),
+        }
+    }
+}