Proposal for serializing namespaces in serde addressing #218

Cargo.toml

@@ -17,6 +17,8 @@ encoding_rs = { version = "0.8", optional = true }
 serde = { version = "1.0", optional = true }
 tokio = { version = "1.20", optional = true, default-features = false, features = ["io-util"] }
 memchr = "2.5"
+quick_xml_derived = { path = "quick-xml-derived" }
+q_meta = { path = "quick-xml-derived/q_meta"}
 
 [dev-dependencies]
 criterion = "0.3"
@@ -26,6 +28,9 @@ serde = { version = "1.0", features = ["derive"] }
 serde-value = "0.7"
 tokio = { version = "1.20", default-features = false, features = ["macros", "rt"] }
 tokio-test = "0.4"
+phf = { version = "0.11.1", features = ["macros"] }
+q_meta = { path = "quick-xml-derived/q_meta"}
+
 
 [lib]
 bench = false
@@ -113,7 +118,7 @@ serialize = ["serde"]
 
 [package.metadata.docs.rs]
 # document all features
-all-features = true
+all-features = false
 # defines the configuration attribute `docs_rs` to enable feature requirements
 # See https://stackoverflow.com/questions/61417452
 rustdoc-args = ["--cfg", "docs_rs"]
@@ -134,6 +139,10 @@ required-features = ["serialize"]
 name = "serde-migrated"
 required-features = ["serialize"]
 
+[[test]]
+name = "serde-namespace-se"
+required-features = ["serialize"]
+
 [[test]]
 name = "async-tokio"
 required-features = ["async-tokio"]

quick-xml-derived/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "quick_xml_derived"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+proc-macro2 = "1.0.43"
+quote = "1.0.21"
+syn = { version = "1.0.99", features = ["full"] }
+serde = { version = "1.0", optional = true }
+phf = { version = "0.11.1", features = ["macros"] }
+
+[dev-dependencies]
+serde = { version = "1.0", features = ["derive"] }
+phf = { version = "0.11.1", features = ["macros"] }
+macrotest = "1.0.9"
+q_meta = { path = "q_meta"}
+trybuild = { version = "1.0.66", features = ["diff"] }
+
+[lib]
+proc-macro = true

quick-xml-derived/q_meta/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "q_meta"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+phf = { version = "0.11.1", features = ["macros"] }
+syllogism = "0.1.3"

quick-xml-derived/q_meta/src/lib.rs

@@ -0,0 +1,80 @@
+use phf::phf_map;
+
+#[derive(Debug)]
+pub struct QuickXmlMeta {
+    pub namespace_declarations: &'static [(&'static str, &'static str)],
+    pub identifier_prefix_map: phf::Map<&'static str, &'static str>
+}
+pub trait CurrentItemVisitorQXmlMeta {
+    fn visit_current_item_as_self<T>(
+        &self,
+        contained_visitor: &mut T,
+        ident_in_parent: Option<&'static str>,
+        parent_meta: Option<&'static QuickXmlMeta>,
+    ) -> &'static QuickXmlMeta
+    where
+        T: ContainedItemVisitorQXmlMeta;
+}
+
+impl CurrentItemVisitorQXmlMeta for String {
+    fn visit_current_item_as_self<T>(
+        &self,
+        contained_visitor: &mut T,
+        ident_in_parent: Option<&'static str>,
+        parent_meta: Option<&'static QuickXmlMeta>,
+    ) -> &'static QuickXmlMeta
+    where
+        T: ContainedItemVisitorQXmlMeta
+    {
+        &QuickXmlMeta {
+            namespace_declarations: &[],
+            identifier_prefix_map: phf_map! {},
+        }
+    }
+}
+
+impl CurrentItemVisitorQXmlMeta for u32 {
+    fn visit_current_item_as_self<T>(
+        &self,
+        contained_visitor: &mut T,
+        ident_in_parent: Option<&'static str>,
+        parent_meta: Option<&'static QuickXmlMeta>,
+    ) -> &'static QuickXmlMeta
+    where
+        T: ContainedItemVisitorQXmlMeta
+    {
+        &QuickXmlMeta {
+            namespace_declarations: &[],
+            identifier_prefix_map: phf_map! {},
+        }
+    }
+}
+
+impl<X: CurrentItemVisitorQXmlMeta> CurrentItemVisitorQXmlMeta for Vec<X> {
+    fn visit_current_item_as_self<T>(
+        &self,
+        contained_visitor: &mut T,
+        ident_in_parent: Option<&'static str>,
+        parent_meta: Option<&'static QuickXmlMeta>,
+    ) -> &'static QuickXmlMeta
+    where
+        T: ContainedItemVisitorQXmlMeta
+    {
+        let self_meta = &QuickXmlMeta {
+            namespace_declarations: &[],
+            identifier_prefix_map: phf_map! {},
+        };
+        self.iter().for_each(|item| T::visit_contained_item(contained_visitor, item, ident_in_parent, parent_meta, true));
+        self_meta
+    }
+}
+
+pub trait ContainedItemVisitorQXmlMeta {
+    fn visit_contained_item<T: CurrentItemVisitorQXmlMeta>(
+        &mut self,
+        obj_to_ser: &T,
+        ident_in_parent: Option<&'static str>,
+        parent_meta: Option<&'static QuickXmlMeta>,
+        is_pseudoobject: bool,
+    );
+} 

quick-xml-derived/src/lib.rs

@@ -0,0 +1,13 @@
+extern crate proc_macro;
+mod quick_xml_derive;
+use quick_xml_derive::impl_quick_xml_derive;
+
+use proc_macro::{TokenStream};
+use syn;
+use syn::{parse_macro_input, DeriveInput};
+
+#[proc_macro_derive(QuickXml, attributes(qxml,serde))]
+pub fn quick_xml_derive(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    impl_quick_xml_derive(input).unwrap_or_else(syn::Error::into_compile_error).into()
+}