move hot reloading utilities to dioxus repository

packages/rsx/src/hot_reload/hot_reload_diff.rs

@@ -0,0 +1,637 @@
+use proc_macro2::TokenStream;
+use syn::{File, Macro};
+
+pub enum DiffResult {
+    CodeChanged,
+    RsxChanged(Vec<(Macro, TokenStream)>),
+}
+
+/// Find any rsx calls in the given file and return a list of all the rsx calls that have changed.
+pub fn find_rsx(new: &File, old: &File) -> DiffResult {
+    let mut rsx_calls = Vec::new();
+    if new.items.len() != old.items.len() {
+        return DiffResult::CodeChanged;
+    }
+    for (new, old) in new.items.iter().zip(old.items.iter()) {
+        if find_rsx_item(new, old, &mut rsx_calls) {
+            return DiffResult::CodeChanged;
+        }
+    }
+    DiffResult::RsxChanged(rsx_calls)
+}
+
+fn find_rsx_item(
+    new: &syn::Item,
+    old: &syn::Item,
+    rsx_calls: &mut Vec<(Macro, TokenStream)>,
+) -> bool {
+    match (new, old) {
+        (syn::Item::Const(new_item), syn::Item::Const(old_item)) => {
+            find_rsx_expr(&new_item.expr, &old_item.expr, rsx_calls)
+                || new_item.attrs != old_item.attrs
+                || new_item.vis != old_item.vis
+                || new_item.const_token != old_item.const_token
+                || new_item.ident != old_item.ident
+                || new_item.colon_token != old_item.colon_token
+                || new_item.ty != old_item.ty
+                || new_item.eq_token != old_item.eq_token
+                || new_item.semi_token != old_item.semi_token
+        }
+        (syn::Item::Enum(new_item), syn::Item::Enum(old_item)) => {
+            if new_item.variants.len() != old_item.variants.len() {
+                return true;
+            }
+            for (new_varient, old_varient) in new_item.variants.iter().zip(old_item.variants.iter())
+            {
+                match (&new_varient.discriminant, &old_varient.discriminant) {
+                    (Some((new_eq, new_expr)), Some((old_eq, old_expr))) => {
+                        if find_rsx_expr(new_expr, old_expr, rsx_calls) || new_eq != old_eq {
+                            return true;
+                        }
+                    }
+                    (None, None) => (),
+                    _ => return true,
+                }
+                if new_varient.attrs != old_varient.attrs
+                    || new_varient.ident != old_varient.ident
+                    || new_varient.fields != old_varient.fields
+                {
+                    return true;
+                }
+            }
+            new_item.attrs != old_item.attrs
+                || new_item.vis != old_item.vis
+                || new_item.enum_token != old_item.enum_token
+                || new_item.ident != old_item.ident
+                || new_item.generics != old_item.generics
+                || new_item.brace_token != old_item.brace_token
+        }
+        (syn::Item::ExternCrate(new_item), syn::Item::ExternCrate(old_item)) => {
+            old_item != new_item
+        }
+        (syn::Item::Fn(new_item), syn::Item::Fn(old_item)) => {
+            find_rsx_block(&new_item.block, &old_item.block, rsx_calls)
+                || new_item.attrs != old_item.attrs
+                || new_item.vis != old_item.vis
+                || new_item.sig != old_item.sig
+        }
+        (syn::Item::ForeignMod(new_item), syn::Item::ForeignMod(old_item)) => old_item != new_item,
+        (syn::Item::Impl(new_item), syn::Item::Impl(old_item)) => {
+            if new_item.items.len() != old_item.items.len() {
+                return true;
+            }
+            for (new_item, old_item) in new_item.items.iter().zip(old_item.items.iter()) {
+                if match (new_item, old_item) {
+                    (syn::ImplItem::Const(new_item), syn::ImplItem::Const(old_item)) => {
+                        find_rsx_expr(&new_item.expr, &old_item.expr, rsx_calls)
+                    }
+                    (syn::ImplItem::Method(new_item), syn::ImplItem::Method(old_item)) => {
+                        find_rsx_block(&new_item.block, &old_item.block, rsx_calls)
+                    }
+                    (syn::ImplItem::Type(new_item), syn::ImplItem::Type(old_item)) => {
+                        old_item != new_item
+                    }
+                    (syn::ImplItem::Macro(new_item), syn::ImplItem::Macro(old_item)) => {
+                        old_item != new_item
+                    }
+                    _ => true,
+                } {
+                    return true;
+                }
+            }
+            new_item.attrs != old_item.attrs
+                || new_item.defaultness != old_item.defaultness
+                || new_item.unsafety != old_item.unsafety
+                || new_item.impl_token != old_item.impl_token
+                || new_item.generics != old_item.generics
+                || new_item.trait_ != old_item.trait_
+                || new_item.self_ty != old_item.self_ty
+                || new_item.brace_token != old_item.brace_token
+        }
+        (syn::Item::Macro(new_item), syn::Item::Macro(old_item)) => {
+            find_rsx_macro(&new_item.mac, &old_item.mac, rsx_calls)
+                || new_item.attrs != old_item.attrs
+                || new_item.semi_token != old_item.semi_token
+                || new_item.ident != old_item.ident
+        }
+        (syn::Item::Macro2(new_item), syn::Item::Macro2(old_item)) => old_item != new_item,
+        (syn::Item::Mod(new_item), syn::Item::Mod(old_item)) => {
+            match (&new_item.content, &old_item.content) {
+                (Some((_, new_items)), Some((_, old_items))) => {
+                    if new_items.len() != old_items.len() {
+                        return true;
+                    }
+                    for (new_item, old_item) in new_items.iter().zip(old_items.iter()) {
+                        if find_rsx_item(new_item, old_item, rsx_calls) {
+                            return true;
+                        }
+                    }
+                    new_item.attrs != old_item.attrs
+                        || new_item.vis != old_item.vis
+                        || new_item.mod_token != old_item.mod_token
+                        || new_item.ident != old_item.ident
+                        || new_item.semi != old_item.semi
+                }
+                (None, None) => {
+                    new_item.attrs != old_item.attrs
+                        || new_item.vis != old_item.vis
+                        || new_item.mod_token != old_item.mod_token
+                        || new_item.ident != old_item.ident
+                        || new_item.semi != old_item.semi
+                }
+                _ => true,
+            }
+        }
+        (syn::Item::Static(new_item), syn::Item::Static(old_item)) => {
+            find_rsx_expr(&new_item.expr, &old_item.expr, rsx_calls)
+                || new_item.attrs != old_item.attrs
+                || new_item.vis != old_item.vis
+                || new_item.static_token != old_item.static_token
+                || new_item.mutability != old_item.mutability
+                || new_item.ident != old_item.ident
+                || new_item.colon_token != old_item.colon_token
+                || new_item.ty != old_item.ty
+                || new_item.eq_token != old_item.eq_token
+                || new_item.semi_token != old_item.semi_token
+        }
+        (syn::Item::Struct(new_item), syn::Item::Struct(old_item)) => old_item != new_item,
+        (syn::Item::Trait(new_item), syn::Item::Trait(old_item)) => {
+            find_rsx_trait(new_item, old_item, rsx_calls)
+        }
+        (syn::Item::TraitAlias(new_item), syn::Item::TraitAlias(old_item)) => old_item != new_item,
+        (syn::Item::Type(new_item), syn::Item::Type(old_item)) => old_item != new_item,
+        (syn::Item::Union(new_item), syn::Item::Union(old_item)) => old_item != new_item,
+        (syn::Item::Use(new_item), syn::Item::Use(old_item)) => old_item != new_item,
+        (syn::Item::Verbatim(_), syn::Item::Verbatim(_)) => false,
+        _ => true,
+    }
+}
+
+fn find_rsx_trait(
+    new_item: &syn::ItemTrait,
+    old_item: &syn::ItemTrait,
+    rsx_calls: &mut Vec<(Macro, TokenStream)>,
+) -> bool {
+    if new_item.items.len() != old_item.items.len() {
+        return true;
+    }
+    for (new_item, old_item) in new_item.items.iter().zip(old_item.items.iter()) {
+        if match (new_item, old_item) {
+            (syn::TraitItem::Const(new_item), syn::TraitItem::Const(old_item)) => {
+                if let (Some((_, new_expr)), Some((_, old_expr))) =
+                    (&new_item.default, &old_item.default)
+                {
+                    find_rsx_expr(new_expr, old_expr, rsx_calls)
+                } else {
+                    true
+                }
+            }
+            (syn::TraitItem::Method(new_item), syn::TraitItem::Method(old_item)) => {
+                if let (Some(new_block), Some(old_block)) = (&new_item.default, &old_item.default) {
+                    find_rsx_block(new_block, old_block, rsx_calls)
+                } else {
+                    true
+                }
+            }
+            (syn::TraitItem::Type(new_item), syn::TraitItem::Type(old_item)) => {
+                old_item != new_item
+            }
+            (syn::TraitItem::Macro(new_item), syn::TraitItem::Macro(old_item)) => {
+                old_item != new_item
+            }
+            _ => true,
+        } {
+            return true;
+        }
+    }
+    new_item.attrs != old_item.attrs
+        || new_item.vis != old_item.vis
+        || new_item.unsafety != old_item.unsafety
+        || new_item.auto_token != old_item.auto_token
+        || new_item.ident != old_item.ident
+        || new_item.generics != old_item.generics
+        || new_item.colon_token != old_item.colon_token
+        || new_item.supertraits != old_item.supertraits
+        || new_item.brace_token != old_item.brace_token
+}
+
+fn find_rsx_block(
+    new_block: &syn::Block,
+    old_block: &syn::Block,
+    rsx_calls: &mut Vec<(Macro, TokenStream)>,
+) -> bool {
+    if new_block.stmts.len() != old_block.stmts.len() {
+        return true;
+    }
+    for (new_stmt, old_stmt) in new_block.stmts.iter().zip(old_block.stmts.iter()) {
+        if find_rsx_stmt(new_stmt, old_stmt, rsx_calls) {
+            return true;
+        }
+    }
+    new_block.brace_token != old_block.brace_token
+}
+
+fn find_rsx_stmt(
+    new_stmt: &syn::Stmt,
+    old_stmt: &syn::Stmt,
+    rsx_calls: &mut Vec<(Macro, TokenStream)>,
+) -> bool {
+    match (new_stmt, old_stmt) {
+        (syn::Stmt::Local(new_local), syn::Stmt::Local(old_local)) => {
+            (match (&new_local.init, &old_local.init) {
+                (Some((new_eq, new_expr)), Some((old_eq, old_expr))) => {
+                    find_rsx_expr(new_expr, old_expr, rsx_calls) || new_eq != old_eq
+                }
+                (None, None) => false,
+                _ => true,
+            } || new_local.attrs != old_local.attrs
+                || new_local.let_token != old_local.let_token
+                || new_local.pat != old_local.pat
+                || new_local.semi_token != old_local.semi_token)
+        }
+        (syn::Stmt::Item(new_item), syn::Stmt::Item(old_item)) => {
+            find_rsx_item(new_item, old_item, rsx_calls)
+        }
+        (syn::Stmt::Expr(new_expr), syn::Stmt::Expr(old_expr)) => {
+            find_rsx_expr(new_expr, old_expr, rsx_calls)
+        }
+        (syn::Stmt::Semi(new_expr, new_semi), syn::Stmt::Semi(old_expr, old_semi)) => {
+            find_rsx_expr(new_expr, old_expr, rsx_calls) || new_semi != old_semi
+        }
+        _ => true,
+    }
+}
+
+fn find_rsx_expr(
+    new_expr: &syn::Expr,
+    old_expr: &syn::Expr,
+    rsx_calls: &mut Vec<(Macro, TokenStream)>,
+) -> bool {
+    match (new_expr, old_expr) {
+        (syn::Expr::Array(new_expr), syn::Expr::Array(old_expr)) => {
+            if new_expr.elems.len() != old_expr.elems.len() {
+                return true;
+            }
+            for (new_el, old_el) in new_expr.elems.iter().zip(old_expr.elems.iter()) {
+                if find_rsx_expr(new_el, old_el, rsx_calls) {
+                    return true;
+                }
+            }
+            new_expr.attrs != old_expr.attrs || new_expr.bracket_token != old_expr.bracket_token
+        }
+        (syn::Expr::Assign(new_expr), syn::Expr::Assign(old_expr)) => {
+            find_rsx_expr(&new_expr.left, &old_expr.left, rsx_calls)
+                || find_rsx_expr(&new_expr.right, &old_expr.right, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.eq_token != old_expr.eq_token
+        }
+        (syn::Expr::AssignOp(new_expr), syn::Expr::AssignOp(old_expr)) => {
+            find_rsx_expr(&new_expr.left, &old_expr.left, rsx_calls)
+                || find_rsx_expr(&new_expr.right, &old_expr.right, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.op != old_expr.op
+        }
+        (syn::Expr::Async(new_expr), syn::Expr::Async(old_expr)) => {
+            find_rsx_block(&new_expr.block, &old_expr.block, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.async_token != old_expr.async_token
+                || new_expr.capture != old_expr.capture
+        }
+        (syn::Expr::Await(new_expr), syn::Expr::Await(old_expr)) => {
+            find_rsx_expr(&new_expr.base, &old_expr.base, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.dot_token != old_expr.dot_token
+                || new_expr.await_token != old_expr.await_token
+        }
+        (syn::Expr::Binary(new_expr), syn::Expr::Binary(old_expr)) => {
+            find_rsx_expr(&new_expr.left, &old_expr.left, rsx_calls)
+                || find_rsx_expr(&new_expr.right, &old_expr.right, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.op != old_expr.op
+        }
+        (syn::Expr::Block(new_expr), syn::Expr::Block(old_expr)) => {
+            find_rsx_block(&new_expr.block, &old_expr.block, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.label != old_expr.label
+        }
+        (syn::Expr::Box(new_expr), syn::Expr::Box(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.box_token != old_expr.box_token
+        }
+        (syn::Expr::Break(new_expr), syn::Expr::Break(old_expr)) => {
+            match (&new_expr.expr, &old_expr.expr) {
+                (Some(new_inner), Some(old_inner)) => {
+                    find_rsx_expr(new_inner, old_inner, rsx_calls)
+                        || new_expr.attrs != old_expr.attrs
+                        || new_expr.break_token != old_expr.break_token
+                        || new_expr.label != old_expr.label
+                }
+                (None, None) => {
+                    new_expr.attrs != old_expr.attrs
+                        || new_expr.break_token != old_expr.break_token
+                        || new_expr.label != old_expr.label
+                }
+                _ => true,
+            }
+        }
+        (syn::Expr::Call(new_expr), syn::Expr::Call(old_expr)) => {
+            find_rsx_expr(&new_expr.func, &old_expr.func, rsx_calls);
+            if new_expr.args.len() != old_expr.args.len() {
+                return true;
+            }
+            for (new_arg, old_arg) in new_expr.args.iter().zip(old_expr.args.iter()) {
+                if find_rsx_expr(new_arg, old_arg, rsx_calls) {
+                    return true;
+                }
+            }
+            new_expr.attrs != old_expr.attrs || new_expr.paren_token != old_expr.paren_token
+        }
+        (syn::Expr::Cast(new_expr), syn::Expr::Cast(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.as_token != old_expr.as_token
+                || new_expr.ty != old_expr.ty
+        }
+        (syn::Expr::Closure(new_expr), syn::Expr::Closure(old_expr)) => {
+            find_rsx_expr(&new_expr.body, &old_expr.body, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.movability != old_expr.movability
+                || new_expr.asyncness != old_expr.asyncness
+                || new_expr.capture != old_expr.capture
+                || new_expr.or1_token != old_expr.or1_token
+                || new_expr.inputs != old_expr.inputs
+                || new_expr.or2_token != old_expr.or2_token
+                || new_expr.output != old_expr.output
+        }
+        (syn::Expr::Continue(new_expr), syn::Expr::Continue(old_expr)) => old_expr != new_expr,
+        (syn::Expr::Field(new_expr), syn::Expr::Field(old_expr)) => {
+            find_rsx_expr(&new_expr.base, &old_expr.base, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.dot_token != old_expr.dot_token
+                || new_expr.member != old_expr.member
+        }
+        (syn::Expr::ForLoop(new_expr), syn::Expr::ForLoop(old_expr)) => {
+            find_rsx_block(&new_expr.body, &old_expr.body, rsx_calls)
+                || find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.label != old_expr.label
+                || new_expr.for_token != old_expr.for_token
+                || new_expr.pat != old_expr.pat
+                || new_expr.in_token != old_expr.in_token
+        }
+        (syn::Expr::Group(new_expr), syn::Expr::Group(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+        }
+        (syn::Expr::If(new_expr), syn::Expr::If(old_expr)) => {
+            if find_rsx_expr(&new_expr.cond, &old_expr.cond, rsx_calls)
+                || find_rsx_block(&new_expr.then_branch, &old_expr.then_branch, rsx_calls)
+            {
+                return true;
+            }
+            match (&new_expr.else_branch, &old_expr.else_branch) {
+                (Some((new_tok, new_else)), Some((old_tok, old_else))) => {
+                    find_rsx_expr(new_else, old_else, rsx_calls)
+                        || new_expr.attrs != old_expr.attrs
+                        || new_expr.if_token != old_expr.if_token
+                        || new_expr.cond != old_expr.cond
+                        || new_tok != old_tok
+                }
+                (None, None) => {
+                    new_expr.attrs != old_expr.attrs
+                        || new_expr.if_token != old_expr.if_token
+                        || new_expr.cond != old_expr.cond
+                }
+                _ => true,
+            }
+        }
+        (syn::Expr::Index(new_expr), syn::Expr::Index(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || find_rsx_expr(&new_expr.index, &old_expr.index, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.bracket_token != old_expr.bracket_token
+        }
+        (syn::Expr::Let(new_expr), syn::Expr::Let(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.let_token != old_expr.let_token
+                || new_expr.pat != old_expr.pat
+                || new_expr.eq_token != old_expr.eq_token
+        }
+        (syn::Expr::Lit(new_expr), syn::Expr::Lit(old_expr)) => old_expr != new_expr,
+        (syn::Expr::Loop(new_expr), syn::Expr::Loop(old_expr)) => {
+            find_rsx_block(&new_expr.body, &old_expr.body, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.label != old_expr.label
+                || new_expr.loop_token != old_expr.loop_token
+        }
+        (syn::Expr::Macro(new_expr), syn::Expr::Macro(old_expr)) => {
+            find_rsx_macro(&new_expr.mac, &old_expr.mac, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+        }
+        (syn::Expr::Match(new_expr), syn::Expr::Match(old_expr)) => {
+            if find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls) {
+                return true;
+            }
+            for (new_arm, old_arm) in new_expr.arms.iter().zip(old_expr.arms.iter()) {
+                match (&new_arm.guard, &old_arm.guard) {
+                    (Some((new_tok, new_expr)), Some((old_tok, old_expr))) => {
+                        if find_rsx_expr(new_expr, old_expr, rsx_calls) || new_tok != old_tok {
+                            return true;
+                        }
+                    }
+                    (None, None) => (),
+                    _ => return true,
+                }
+                if find_rsx_expr(&new_arm.body, &old_arm.body, rsx_calls)
+                    || new_arm.attrs != old_arm.attrs
+                    || new_arm.pat != old_arm.pat
+                    || new_arm.fat_arrow_token != old_arm.fat_arrow_token
+                    || new_arm.comma != old_arm.comma
+                {
+                    return true;
+                }
+            }
+            new_expr.attrs != old_expr.attrs
+                || new_expr.match_token != old_expr.match_token
+                || new_expr.brace_token != old_expr.brace_token
+        }
+        (syn::Expr::MethodCall(new_expr), syn::Expr::MethodCall(old_expr)) => {
+            if find_rsx_expr(&new_expr.receiver, &old_expr.receiver, rsx_calls) {
+                return true;
+            }
+            for (new_arg, old_arg) in new_expr.args.iter().zip(old_expr.args.iter()) {
+                if find_rsx_expr(new_arg, old_arg, rsx_calls) {
+                    return true;
+                }
+            }
+            new_expr.attrs != old_expr.attrs
+                || new_expr.dot_token != old_expr.dot_token
+                || new_expr.method != old_expr.method
+                || new_expr.turbofish != old_expr.turbofish
+                || new_expr.paren_token != old_expr.paren_token
+        }
+        (syn::Expr::Paren(new_expr), syn::Expr::Paren(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.paren_token != old_expr.paren_token
+        }
+        (syn::Expr::Path(new_expr), syn::Expr::Path(old_expr)) => old_expr != new_expr,
+        (syn::Expr::Range(new_expr), syn::Expr::Range(old_expr)) => {
+            match (&new_expr.from, &old_expr.from) {
+                (Some(new_expr), Some(old_expr)) => {
+                    if find_rsx_expr(new_expr, old_expr, rsx_calls) {
+                        return true;
+                    }
+                }
+                (None, None) => (),
+                _ => return true,
+            }
+            match (&new_expr.to, &old_expr.to) {
+                (Some(new_inner), Some(old_inner)) => {
+                    find_rsx_expr(new_inner, old_inner, rsx_calls)
+                        || new_expr.attrs != old_expr.attrs
+                        || new_expr.limits != old_expr.limits
+                }
+                (None, None) => {
+                    new_expr.attrs != old_expr.attrs || new_expr.limits != old_expr.limits
+                }
+                _ => true,
+            }
+        }
+        (syn::Expr::Reference(new_expr), syn::Expr::Reference(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.and_token != old_expr.and_token
+                || new_expr.mutability != old_expr.mutability
+        }
+        (syn::Expr::Repeat(new_expr), syn::Expr::Repeat(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || find_rsx_expr(&new_expr.len, &old_expr.len, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.bracket_token != old_expr.bracket_token
+                || new_expr.semi_token != old_expr.semi_token
+        }
+        (syn::Expr::Return(new_expr), syn::Expr::Return(old_expr)) => {
+            match (&new_expr.expr, &old_expr.expr) {
+                (Some(new_inner), Some(old_inner)) => {
+                    find_rsx_expr(new_inner, old_inner, rsx_calls)
+                        || new_expr.attrs != old_expr.attrs
+                        || new_expr.return_token != old_expr.return_token
+                }
+                (None, None) => {
+                    new_expr.attrs != old_expr.attrs
+                        || new_expr.return_token != old_expr.return_token
+                }
+                _ => true,
+            }
+        }
+        (syn::Expr::Struct(new_expr), syn::Expr::Struct(old_expr)) => {
+            match (&new_expr.rest, &old_expr.rest) {
+                (Some(new_expr), Some(old_expr)) => {
+                    if find_rsx_expr(new_expr, old_expr, rsx_calls) {
+                        return true;
+                    }
+                }
+                (None, None) => (),
+                _ => return true,
+            }
+            for (new_field, old_field) in new_expr.fields.iter().zip(old_expr.fields.iter()) {
+                if find_rsx_expr(&new_field.expr, &old_field.expr, rsx_calls)
+                    || new_field.attrs != old_field.attrs
+                    || new_field.member != old_field.member
+                    || new_field.colon_token != old_field.colon_token
+                {
+                    return true;
+                }
+            }
+            new_expr.attrs != old_expr.attrs
+                || new_expr.path != old_expr.path
+                || new_expr.brace_token != old_expr.brace_token
+                || new_expr.dot2_token != old_expr.dot2_token
+        }
+        (syn::Expr::Try(new_expr), syn::Expr::Try(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.question_token != old_expr.question_token
+        }
+        (syn::Expr::TryBlock(new_expr), syn::Expr::TryBlock(old_expr)) => {
+            find_rsx_block(&new_expr.block, &old_expr.block, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.try_token != old_expr.try_token
+        }
+        (syn::Expr::Tuple(new_expr), syn::Expr::Tuple(old_expr)) => {
+            for (new_el, old_el) in new_expr.elems.iter().zip(old_expr.elems.iter()) {
+                if find_rsx_expr(new_el, old_el, rsx_calls) {
+                    return true;
+                }
+            }
+            new_expr.attrs != old_expr.attrs || new_expr.paren_token != old_expr.paren_token
+        }
+        (syn::Expr::Type(new_expr), syn::Expr::Type(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.colon_token != old_expr.colon_token
+                || new_expr.ty != old_expr.ty
+        }
+        (syn::Expr::Unary(new_expr), syn::Expr::Unary(old_expr)) => {
+            find_rsx_expr(&new_expr.expr, &old_expr.expr, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.op != old_expr.op
+        }
+        (syn::Expr::Unsafe(new_expr), syn::Expr::Unsafe(old_expr)) => {
+            find_rsx_block(&new_expr.block, &old_expr.block, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.unsafe_token != old_expr.unsafe_token
+        }
+        (syn::Expr::While(new_expr), syn::Expr::While(old_expr)) => {
+            find_rsx_expr(&new_expr.cond, &old_expr.cond, rsx_calls)
+                || find_rsx_block(&new_expr.body, &old_expr.body, rsx_calls)
+                || new_expr.attrs != old_expr.attrs
+                || new_expr.label != old_expr.label
+                || new_expr.while_token != old_expr.while_token
+        }
+        (syn::Expr::Yield(new_expr), syn::Expr::Yield(old_expr)) => {
+            match (&new_expr.expr, &old_expr.expr) {
+                (Some(new_inner), Some(old_inner)) => {
+                    find_rsx_expr(new_inner, old_inner, rsx_calls)
+                        || new_expr.attrs != old_expr.attrs
+                        || new_expr.yield_token != old_expr.yield_token
+                }
+                (None, None) => {
+                    new_expr.attrs != old_expr.attrs || new_expr.yield_token != old_expr.yield_token
+                }
+                _ => true,
+            }
+        }
+        (syn::Expr::Verbatim(_), syn::Expr::Verbatim(_)) => false,
+        _ => true,
+    }
+}
+
+fn find_rsx_macro(
+    new_mac: &syn::Macro,
+    old_mac: &syn::Macro,
+    rsx_calls: &mut Vec<(Macro, TokenStream)>,
+) -> bool {
+    if matches!(
+        new_mac
+            .path
+            .get_ident()
+            .map(|ident| ident.to_string())
+            .as_deref(),
+        Some("rsx" | "render")
+    ) && matches!(
+        old_mac
+            .path
+            .get_ident()
+            .map(|ident| ident.to_string())
+            .as_deref(),
+        Some("rsx" | "render")
+    ) {
+        rsx_calls.push((old_mac.clone(), new_mac.tokens.clone()));
+        false
+    } else {
+        new_mac != old_mac
+    }
+}

packages/rsx/src/hot_reload/hot_reloading_file_map.rs

@@ -0,0 +1,120 @@
+use crate::{CallBody, HotReloadingContext};
+use dioxus_core::Template;
+pub use proc_macro2::TokenStream;
+pub use std::collections::HashMap;
+use std::path::PathBuf;
+pub use std::sync::Mutex;
+pub use std::time::SystemTime;
+pub use std::{fs, io, path::Path};
+pub use std::{fs::File, io::Read};
+pub use syn::__private::ToTokens;
+use syn::spanned::Spanned;
+
+use super::hot_reload_diff::{find_rsx, DiffResult};
+
+pub enum UpdateResult {
+    UpdatedRsx(Vec<Template<'static>>),
+    NeedsRebuild,
+}
+
+pub struct FileMap<Ctx: HotReloadingContext> {
+    pub map: HashMap<PathBuf, (String, Option<Template<'static>>)>,
+    phantom: std::marker::PhantomData<Ctx>,
+}
+
+impl<Ctx: HotReloadingContext> FileMap<Ctx> {
+    /// Create a new FileMap from a crate directory
+    pub fn new(path: PathBuf) -> Self {
+        fn find_rs_files(
+            root: PathBuf,
+        ) -> io::Result<HashMap<PathBuf, (String, Option<Template<'static>>)>> {
+            let mut files = HashMap::new();
+            if root.is_dir() {
+                for entry in (fs::read_dir(root)?).flatten() {
+                    let path = entry.path();
+                    files.extend(find_rs_files(path)?);
+                }
+            } else if root.extension().and_then(|s| s.to_str()) == Some("rs") {
+                if let Ok(mut file) = File::open(root.clone()) {
+                    let mut src = String::new();
+                    file.read_to_string(&mut src).expect("Unable to read file");
+                    files.insert(root, (src, None));
+                }
+            }
+            Ok(files)
+        }
+
+        let result = Self {
+            map: find_rs_files(path).unwrap(),
+            phantom: std::marker::PhantomData,
+        };
+        result
+    }
+
+    /// Try to update the rsx in a file
+    pub fn update_rsx(&mut self, file_path: &Path, crate_dir: &Path) -> UpdateResult {
+        let mut file = File::open(file_path).unwrap();
+        let mut src = String::new();
+        file.read_to_string(&mut src).expect("Unable to read file");
+        if let Ok(syntax) = syn::parse_file(&src) {
+            if let Some((old_src, template_slot)) = self.map.get_mut(file_path) {
+                if let Ok(old) = syn::parse_file(old_src) {
+                    match find_rsx(&syntax, &old) {
+                        DiffResult::CodeChanged => {
+                            self.map.insert(file_path.to_path_buf(), (src, None));
+                        }
+                        DiffResult::RsxChanged(changed) => {
+                            let mut messages: Vec<Template<'static>> = Vec::new();
+                            for (old, new) in changed.into_iter() {
+                                let old_start = old.span().start();
+
+                                if let (Ok(old_call_body), Ok(new_call_body)) = (
+                                    syn::parse2::<CallBody<Ctx>>(old.tokens),
+                                    syn::parse2::<CallBody<Ctx>>(new),
+                                ) {
+                                    if let Ok(file) = file_path.strip_prefix(crate_dir) {
+                                        let line = old_start.line;
+                                        let column = old_start.column + 1;
+                                        let location = file.display().to_string()
+                                        + ":"
+                                        + &line.to_string()
+                                        + ":"
+                                        + &column.to_string()
+                                        // the byte index doesn't matter, but dioxus needs it
+                                        + ":0";
+
+                                        if let Some(template) = new_call_body.update_template(
+                                            Some(old_call_body),
+                                            Box::leak(location.into_boxed_str()),
+                                        ) {
+                                            // dioxus cannot handle empty templates
+                                            if template.roots.is_empty() {
+                                                return UpdateResult::NeedsRebuild;
+                                            } else {
+                                                // if the template is the same, don't send it
+                                                if let Some(old_template) = template_slot {
+                                                    if old_template == &template {
+                                                        continue;
+                                                    }
+                                                }
+                                                *template_slot = Some(template);
+                                                messages.push(template);
+                                            }
+                                        } else {
+                                            return UpdateResult::NeedsRebuild;
+                                        }
+                                    }
+                                }
+                            }
+                            return UpdateResult::UpdatedRsx(messages);
+                        }
+                    }
+                }
+            } else {
+                // if this is a new file, rebuild the project
+                *self = FileMap::new(crate_dir.to_path_buf());
+            }
+        }
+        UpdateResult::NeedsRebuild
+    }
+}

packages/rsx/src/hot_reload/mod.rs

@@ -0,0 +1,6 @@
+mod hot_reload_diff;
+pub use hot_reload_diff::*;
+mod hot_reloading_context;
+pub use hot_reloading_context::*;
+mod hot_reloading_file_map;
+pub use hot_reloading_file_map::*;

packages/rsx/src/lib.rs

@@ -15,7 +15,7 @@
 mod errors;
 mod component;
 mod element;
-mod hot_reloading_context;
+pub mod hot_reload;
 mod ifmt;
 mod node;
 
@@ -25,8 +25,8 @@ use std::{collections::HashMap, fmt::Debug, hash::Hash};
 pub use component::*;
 use dioxus_core::{Template, TemplateAttribute, TemplateNode};
 pub use element::*;
-use hot_reloading_context::Empty;
-pub use hot_reloading_context::HotReloadingContext;
+use hot_reload::Empty;
+pub use hot_reload::HotReloadingContext;
 pub use ifmt::*;
 use internment::Intern;
 pub use node::*;