allow custom string literals to be captured for hot reloading

packages/rsx_interpreter/src/captuered_context.rs

@@ -1,11 +1,13 @@
+use std::collections::HashSet;
+
 use dioxus_core::{Listener, VNode};
 use dioxus_rsx::{
     BodyNode, CallBody, Component, ElementAttr, ElementAttrNamed, IfmtInput, Segment,
 };
 use quote::{quote, ToTokens, TokenStreamExt};
-use syn::{Expr, Ident, Result};
+use syn::{Expr, Ident, LitStr, Result};
 
-use crate::CodeLocation;
+use crate::{attributes::attrbute_to_static_str, CodeLocation};
 #[derive(Default)]
 pub struct CapturedContextBuilder {
     pub ifmted: Vec<IfmtInput>,
@@ -14,6 +16,7 @@ pub struct CapturedContextBuilder {
     pub captured_expressions: Vec<Expr>,
     pub listeners: Vec<ElementAttrNamed>,
     pub custom_context: Option<Ident>,
+    pub custom_attributes: HashSet<LitStr>,
 }
 
 impl CapturedContextBuilder {
@@ -23,6 +26,7 @@ impl CapturedContextBuilder {
         self.iterators.extend(other.iterators);
         self.listeners.extend(other.listeners);
         self.captured_expressions.extend(other.captured_expressions);
+        self.custom_attributes.extend(other.custom_attributes);
     }
 
     pub fn from_call_body(body: CallBody) -> Result<Self> {
@@ -42,8 +46,13 @@ impl CapturedContextBuilder {
             BodyNode::Element(el) => {
                 for attr in el.attributes {
                     match attr.attr {
-                        ElementAttr::AttrText { value, .. }
-                        | ElementAttr::CustomAttrText { value, .. } => {
+                        ElementAttr::AttrText { value, .. } => {
+                            let value_tokens = value.to_token_stream();
+                            let formated: IfmtInput = syn::parse2(value_tokens)?;
+                            captured.ifmted.push(formated);
+                        }
+                        ElementAttr::CustomAttrText { value, name } => {
+                            captured.custom_attributes.insert(name);
                             let value_tokens = value.to_token_stream();
                             let formated: IfmtInput = syn::parse2(value_tokens)?;
                             captured.ifmted.push(formated);
@@ -51,7 +60,8 @@ impl CapturedContextBuilder {
                         ElementAttr::AttrExpression { name: _, value } => {
                             captured.captured_expressions.push(value);
                         }
-                        ElementAttr::CustomAttrExpression { name: _, value } => {
+                        ElementAttr::CustomAttrExpression { name, value } => {
+                            captured.custom_attributes.insert(name);
                             captured.captured_expressions.push(value);
                         }
                         ElementAttr::EventTokens { .. } => captured.listeners.push(attr),
@@ -91,6 +101,7 @@ impl ToTokens for CapturedContextBuilder {
             captured_expressions,
             listeners,
             custom_context: _,
+            custom_attributes,
         } = self;
         let listeners_str = listeners
             .iter()
@@ -113,9 +124,9 @@ impl ToTokens for CapturedContextBuilder {
                     let expr = segment.to_token_stream();
                     let as_string = expr.to_string();
                     let format_expr = if format_args.is_empty() {
-                        "{".to_string() + format_args + "}"
+                        "{".to_string() + &format_args + "}"
                     } else {
-                        "{".to_string() + ":" + format_args + "}"
+                        "{".to_string() + ":" + &format_args + "}"
                     };
                     Some(quote! {
                         FormattedArg{
@@ -131,6 +142,7 @@ impl ToTokens for CapturedContextBuilder {
         let captured_attr_expressions_text = captured_expressions
             .iter()
             .map(|e| format!("{}", e.to_token_stream()));
+        let custom_attributes_iter = custom_attributes.iter();
         tokens.append_all(quote! {
             CapturedContext {
                 captured: IfmtArgs{
@@ -140,6 +152,7 @@ impl ToTokens for CapturedContextBuilder {
                 iterators: vec![#((#iterators_str, #iterators)),*],
                 expressions: vec![#((#captured_attr_expressions_text, #captured_expressions.to_string())),*],
                 listeners: vec![#((#listeners_str, #listeners)),*],
+                custom_attributes: &[#(#custom_attributes_iter),*],
                 location: code_location.clone()
             }
         })
@@ -159,10 +172,31 @@ pub struct CapturedContext<'a> {
     pub expressions: Vec<(&'static str, String)>,
     // map listener code to the resulting listener
     pub listeners: Vec<(&'static str, Listener<'a>)>,
+    // used to map custom attrbutes form &'a str to &'static str
+    pub custom_attributes: &'static [&'static str],
     // used to provide better error messages
     pub location: CodeLocation,
 }
 
+impl<'a> CapturedContext<'a> {
+    pub fn attrbute_to_static_str(
+        &self,
+        attr: &str,
+        literal: bool,
+    ) -> Option<(&'static str, Option<&'static str>)> {
+        if let Some(attr) = attrbute_to_static_str(attr) {
+            Some(attr)
+        } else if literal {
+            self.custom_attributes
+                .iter()
+                .find(|attribute| attr == **attribute)
+                .map(|attribute| (*attribute, None))
+        } else {
+            None
+        }
+    }
+}
+
 pub struct IfmtArgs {
     // All expressions that have been resolved
     pub named_args: Vec<FormattedArg>,

packages/rsx_interpreter/src/error.rs

@@ -15,6 +15,7 @@ pub enum RecompileReason {
     CapturedExpression(String),
     CapturedComponent(String),
     CapturedListener(String),
+    CapturedAttribute(String),
 }
 
 #[derive(Debug, Serialize, Deserialize)]

packages/rsx_interpreter/src/interperter.rs

@@ -5,7 +5,6 @@ use quote::__private::Span;
 use std::str::FromStr;
 use syn::{parse2, parse_str, Expr};
 
-use crate::attributes::attrbute_to_static_str;
 use crate::captuered_context::{CapturedContext, IfmtArgs};
 use crate::elements::element_to_static_str;
 use crate::error::{Error, ParseError, RecompileReason};
@@ -39,7 +38,7 @@ fn resolve_ifmt(ifmt: &IfmtInput, captured: &IfmtArgs) -> Result<String, Error>
                     }
                 }
             }
-            Segment::Literal(lit) => result.push_str(lit),
+            Segment::Literal(lit) => result.push_str(&lit),
         }
     }
     Ok(result)
@@ -80,25 +79,35 @@ fn build_node<'a>(
             for attr in &el.attributes {
                 match &attr.attr {
                     ElementAttr::AttrText { .. } | ElementAttr::CustomAttrText { .. } => {
-                        let (name, value, span): (String, IfmtInput, Span) = match &attr.attr {
+                        let (name, value, span, literal): (String, IfmtInput, Span, bool) =
+                            match &attr.attr {
                                 ElementAttr::AttrText { name, value } => (
                                     name.to_string(),
                                     IfmtInput::from_str(&value.value()).map_err(|err| {
-                                    Error::ParseError(ParseError::new(err, ctx.location.clone()))
+                                        Error::ParseError(ParseError::new(
+                                            err,
+                                            ctx.location.clone(),
+                                        ))
                                     })?,
                                     name.span(),
+                                    false,
                                 ),
                                 ElementAttr::CustomAttrText { name, value } => (
                                     name.value(),
                                     IfmtInput::from_str(&value.value()).map_err(|err| {
-                                    Error::ParseError(ParseError::new(err, ctx.location.clone()))
+                                        Error::ParseError(ParseError::new(
+                                            err,
+                                            ctx.location.clone(),
+                                        ))
                                     })?,
                                     name.span(),
+                                    true,
                                 ),
                                 _ => unreachable!(),
                             };
 
-                        if let Some((name, namespace)) = attrbute_to_static_str(&name) {
+                        if let Some((name, namespace)) = ctx.attrbute_to_static_str(&name, literal)
+                        {
                             let value = bump.alloc(resolve_ifmt(&value, &ctx.captured)?);
                             attributes.push(Attribute {
                                 name,
@@ -107,6 +116,12 @@ fn build_node<'a>(
                                 is_volatile: false,
                                 namespace,
                             });
+                        } else {
+                            if literal {
+                                // literals will be captured when a full recompile is triggered
+                                return Err(Error::RecompileRequiredError(
+                                    RecompileReason::CapturedAttribute(name.to_string()),
+                                ));
                             } else {
                                 return Err(Error::ParseError(ParseError::new(
                                     syn::Error::new(span, format!("unknown attribute: {}", name)),
@@ -114,15 +129,16 @@ fn build_node<'a>(
                                 )));
                             }
                         }
+                    }
 
                     ElementAttr::AttrExpression { .. }
                     | ElementAttr::CustomAttrExpression { .. } => {
-                        let (name, value) = match &attr.attr {
+                        let (name, value, span, literal) = match &attr.attr {
                             ElementAttr::AttrExpression { name, value } => {
-                                (name.to_string(), value)
+                                (name.to_string(), value, name.span(), false)
                             }
                             ElementAttr::CustomAttrExpression { name, value } => {
-                                (name.value(), value)
+                                (name.value(), value, name.span(), true)
                             }
                             _ => unreachable!(),
                         };
@@ -131,7 +147,9 @@ fn build_node<'a>(
                             .iter()
                             .find(|(n, _)| parse_str::<Expr>(*n).unwrap() == *value)
                         {
-                            if let Some((name, namespace)) = attrbute_to_static_str(&name) {
+                            if let Some((name, namespace)) =
+                                ctx.attrbute_to_static_str(&name, literal)
+                            {
                                 let value = bump.alloc(resulting_value.clone());
                                 attributes.push(Attribute {
                                     name,
@@ -140,6 +158,21 @@ fn build_node<'a>(
                                     is_volatile: false,
                                     namespace,
                                 });
+                            } else {
+                                if literal {
+                                    // literals will be captured when a full recompile is triggered
+                                    return Err(Error::RecompileRequiredError(
+                                        RecompileReason::CapturedAttribute(name.to_string()),
+                                    ));
+                                } else {
+                                    return Err(Error::ParseError(ParseError::new(
+                                        syn::Error::new(
+                                            span,
+                                            format!("unknown attribute: {}", name),
+                                        ),
+                                        ctx.location.clone(),
+                                    )));
+                                }
                             }
                         } else {
                             return Err(Error::RecompileRequiredError(

packages/rsx_interpreter/tests/render.rs

@@ -24,6 +24,7 @@ fn render_basic() {
         expressions: Vec::new(),
         listeners: Vec::new(),
         location: location.clone(),
+        custom_attributes: &[],
     };
     let interperted_vnodes = LazyNodes::new(|factory| {
         dioxus_rsx_interpreter::resolve_scope(
@@ -70,6 +71,7 @@ fn render_nested() {
         expressions: Vec::new(),
         listeners: Vec::new(),
         location: location.clone(),
+        custom_attributes: &[],
     };
     let interperted_vnodes = LazyNodes::new(|factory| {
         dioxus_rsx_interpreter::resolve_scope(
@@ -90,6 +92,54 @@ fn render_nested() {
     assert!(check_eq(interperted_vnodes, static_vnodes));
 }
 
+#[test]
+#[allow(non_snake_case)]
+fn render_custom_attribute() {
+    fn Base(cx: Scope) -> Element {
+        rsx!(cx, div {})
+    }
+
+    let dom = VirtualDom::new(Base);
+    let static_vnodes = rsx! {
+        div {
+            "data-test-1": 0,
+            "data-test-2": "1",
+        }
+    };
+    let location = CodeLocation {
+        file_path: String::new(),
+        crate_path: String::new(),
+        line: 2,
+        column: 0,
+    };
+    let empty_context = CapturedContext {
+        captured: IfmtArgs {
+            named_args: Vec::new(),
+        },
+        components: Vec::new(),
+        iterators: Vec::new(),
+        expressions: vec![("0", "0".to_string())],
+        listeners: Vec::new(),
+        location: location.clone(),
+        custom_attributes: &["data-test-1", "data-test-2"],
+    };
+    let interperted_vnodes = LazyNodes::new(|factory| {
+        dioxus_rsx_interpreter::resolve_scope(
+            location,
+            r#"div {
+                "data-test-1": 0,
+                "data-test-2": "1",
+            }"#,
+            empty_context,
+            factory,
+        )
+    });
+
+    let interperted_vnodes = dom.render_vnodes(interperted_vnodes);
+    let static_vnodes = dom.render_vnodes(static_vnodes);
+    assert!(check_eq(interperted_vnodes, static_vnodes));
+}
+
 #[test]
 #[allow(non_snake_case)]
 fn render_component() {
@@ -110,7 +160,7 @@ fn render_component() {
     let location = CodeLocation {
         file_path: String::new(),
         crate_path: String::new(),
-        line: 2,
+        line: 3,
         column: 0,
     };
 
@@ -127,6 +177,7 @@ fn render_component() {
             expressions: Vec::new(),
             listeners: Vec::new(),
             location: location.clone(),
+            custom_attributes: &[],
         };
         dioxus_rsx_interpreter::resolve_scope(
             location,
@@ -162,7 +213,7 @@ fn render_iterator() {
     let location = CodeLocation {
         file_path: String::new(),
         crate_path: String::new(),
-        line: 3,
+        line: 4,
         column: 0,
     };
 
@@ -180,6 +231,7 @@ fn render_iterator() {
             expressions: Vec::new(),
             listeners: Vec::new(),
             location: location.clone(),
+            custom_attributes: &[],
         };
         dioxus_rsx_interpreter::resolve_scope(
             location,
@@ -216,7 +268,7 @@ fn render_captured_variable() {
     let location = CodeLocation {
         file_path: String::new(),
         crate_path: String::new(),
-        line: 4,
+        line: 5,
         column: 0,
     };
 
@@ -234,6 +286,7 @@ fn render_captured_variable() {
             expressions: Vec::new(),
             listeners: Vec::new(),
             location: location.clone(),
+            custom_attributes: &[],
         };
         dioxus_rsx_interpreter::resolve_scope(
             location,
@@ -268,7 +321,7 @@ fn render_listener() {
     let location = CodeLocation {
         file_path: String::new(),
         crate_path: String::new(),
-        line: 5,
+        line: 6,
         column: 0,
     };
 
@@ -287,6 +340,7 @@ fn render_listener() {
                 dioxus_elements::on::onclick(factory, f),
             )],
             location: location.clone(),
+            custom_attributes: &[],
         };
         dioxus_rsx_interpreter::resolve_scope(
             location,