feat(wasm/html): add callback to generate the default path resolver i…

…n resolvePath (#659)

js/mod.ts

@@ -165,9 +165,13 @@ export type UrlResolveKind =
   | UrlResolveKindFile
   | UrlResolveKindSymbol;
 
-interface HrefResolver {
-  /** Resolver for how files should link to eachother. */
-  resolvePath?(current: UrlResolveKind, target: UrlResolveKind): string;
+export interface HrefResolver {
+  /** Resolver for how files should link to each other. */
+  resolvePath?(
+    current: UrlResolveKind,
+    target: UrlResolveKind,
+    defaultResolve: () => string,
+  ): string;
   /** Resolver for global symbols, like the Deno namespace or other built-ins */
   resolveGlobalSymbol?(symbol: string[]): string | undefined;
   /** Resolver for symbols from non-relative imports */
@@ -212,7 +216,7 @@ export interface UsageComposer {
   ): Map<UsageComposerEntry, string>;
 }
 
-interface GenerateOptions {
+export interface GenerateOptions {
   /** The name of the package to use in the breadcrumbs. */
   packageName?: string;
   /** The main entrypoint if one is present. */
@@ -236,10 +240,9 @@ interface GenerateOptions {
    */
   symbolRedirectMap?: Record<string, Record<string, string>>;
   /**
-   * Map of modules, where the value is a link to where the default symbol
-   * should redirect to.
+   * Map of modules, where the value is what the name of the default symbol should be.
    */
-  defaultRedirectMap?: Record<string, string>;
+  defaultSymbolMap?: Record<string, string>;
   /**
    * Hook to inject content in the `head` tag.
    *
@@ -300,8 +303,8 @@ const defaultUsageComposer: UsageComposer = {
  * @param docNodesByUrl DocNodes keyed by their absolute URL.
  */
 export async function generateHtml(
-  options: GenerateOptions,
   docNodesByUrl: Record<string, Array<DocNode>>,
+  options: GenerateOptions,
 ): Promise<Record<string, string>> {
   const {
     usageComposer = defaultUsageComposer,
@@ -317,7 +320,7 @@ export async function generateHtml(
     options.categoryDocs,
     options.disableSearch ?? false,
     options.symbolRedirectMap,
-    options.defaultRedirectMap,
+    options.defaultSymbolMap,
     options.hrefResolver?.resolvePath,
     options.hrefResolver?.resolveGlobalSymbol || (() => undefined),
     options.hrefResolver?.resolveImportHref || (() => undefined),

js/test.ts

@@ -131,7 +131,7 @@ Deno.test({
       "https://deno.land/[email protected]/fmt/colors.ts",
     );
 
-    const files = await generateHtml({
+    const files = await generateHtml({ ["file:///colors.ts"]: entries }, {
       markdownRenderer(
         md,
         _titleOnly,
@@ -143,7 +143,7 @@ Deno.test({
       markdownStripper(md: string) {
         return md;
       },
-    }, { ["file:///colors.ts"]: entries });
+    });
 
     assertEquals(Object.keys(files).length, 61);
   },

lib/lib.rs

@@ -23,6 +23,7 @@ use import_map::ImportMap;
 use import_map::ImportMapOptions;
 use indexmap::IndexMap;
 use serde::Serialize;
+use std::ffi::c_void;
 use std::rc::Rc;
 use wasm_bindgen::prelude::*;
 use wasm_bindgen_futures::JsFuture;
@@ -37,6 +38,11 @@ macro_rules! console_warn {
   ($($t:tt)*) => (warn(&format_args!($($t)*).to_string()))
 }
 
+thread_local! {
+  static CURRENT: std::cell::RefCell<*const c_void> = const { std::cell::RefCell::new(std::ptr::null()) };
+  static TARGET: std::cell::RefCell<*const c_void> = const { std::cell::RefCell::new(std::ptr::null()) };
+}
+
 struct JsLoader {
   load: js_sys::Function,
 }
@@ -318,13 +324,71 @@ impl deno_doc::html::HrefResolver for JsHrefResolver {
     if let Some(resolve_path) = &self.resolve_path {
       let this = JsValue::null();
 
+      let new_current = current.clone();
+      let new_target = target.clone();
+
+      {
+        let current_ptr =
+          &new_current as *const UrlResolveKind as *const c_void;
+        CURRENT.set(current_ptr);
+        let target = &new_target as *const UrlResolveKind as *const c_void;
+        TARGET.set(target);
+      }
+
+      let default_closure = Box::new(move || {
+        CURRENT.with(|current| {
+          let current_ptr = *current.borrow() as *const UrlResolveKind;
+          assert!(!current_ptr.is_null());
+          // SAFETY: this pointer is valid until destroyed, which is done
+          //  after compose is called
+          let current_val = unsafe { &*current_ptr };
+
+          let path = TARGET.with(|target| {
+            let target_ptr = *target.borrow() as *const UrlResolveKind;
+            assert!(!target_ptr.is_null());
+            // SAFETY: this pointer is valid until destroyed, which is done
+            //  after compose is called
+            let target_val = unsafe { &*target_ptr };
+
+            let path =
+              deno_doc::html::href_path_resolve(*current_val, *target_val);
+
+            *target.borrow_mut() =
+              target_val as *const UrlResolveKind as *const c_void;
+
+            path
+          });
+
+          *current.borrow_mut() =
+            current_val as *const UrlResolveKind as *const c_void;
+
+          path
+        })
+      });
+
+      let default_closure =
+        Closure::wrap(Box::new(default_closure) as Box<dyn Fn() -> String>);
+      let default_closure =
+        JsCast::unchecked_ref::<js_sys::Function>(default_closure.as_ref());
+
       let current = serde_wasm_bindgen::to_value(&current).unwrap();
       let target = serde_wasm_bindgen::to_value(&target).unwrap();
 
       let global_symbol = resolve_path
-        .call2(&this, &current, &target)
+        .call3(&this, &current, &target, default_closure)
         .expect("resolve_path errored");
 
+      {
+        let current =
+          CURRENT.replace(std::ptr::null()) as *const UrlResolveKind;
+        // SAFETY: take the pointer and drop it
+        let _ = unsafe { &*current };
+
+        let target = TARGET.replace(std::ptr::null()) as *const UrlResolveKind;
+        // SAFETY: take the pointer and drop it
+        let _ = unsafe { &*target };
+      }
+
       serde_wasm_bindgen::from_value(global_symbol)
         .expect("resolve_path returned an invalid value")
     } else {

src/html/mod.rs

@@ -493,7 +493,7 @@ impl ShortPath {
     if self.is_main {
       UrlResolveKind::Root
     } else {
-      UrlResolveKind::File(self)
+      UrlResolveKind::File { file: self }
     }
   }
 }

src/html/pages.rs

@@ -113,7 +113,7 @@ impl CategoriesPanelCtx {
             name: short_path.display_name().to_string(),
             href: ctx.ctx.resolve_path(
               ctx.get_current_resolve(),
-              UrlResolveKind::File(short_path),
+              UrlResolveKind::File { file: short_path },
             ),
             active: current_path.is_some_and(|current_path| {
               current_path == short_path.display_name()
@@ -157,7 +157,7 @@ impl CategoriesPanelCtx {
           .map(|title| CategoriesPanelCategoryCtx {
             href: ctx.ctx.resolve_path(
               ctx.get_current_resolve(),
-              UrlResolveKind::Category(&title),
+              UrlResolveKind::Category { category: &title },
             ),
             active: current_path
               .is_some_and(|current_path| current_path == title),
@@ -320,7 +320,7 @@ impl IndexCtx {
               header: SectionHeaderCtx {
                 href: Some(render_ctx.ctx.resolve_path(
                   render_ctx.get_current_resolve(),
-                  UrlResolveKind::Category(&title),
+                  UrlResolveKind::Category { category: &title },
                 )),
                 title,
                 anchor: AnchorCtx { id: anchor },
@@ -376,8 +376,11 @@ impl IndexCtx {
     partitions: partition::Partitions<String>,
     all_doc_nodes: &[DocNodeWithContext],
   ) -> Self {
-    let render_ctx =
-      RenderContext::new(ctx, all_doc_nodes, UrlResolveKind::Category(name));
+    let render_ctx = RenderContext::new(
+      ctx,
+      all_doc_nodes,
+      UrlResolveKind::Category { category: name },
+    );
 
     let sections = super::namespace::render_namespace(
       partitions.into_iter().map(|(title, nodes)| {
@@ -398,8 +401,10 @@ impl IndexCtx {
       }),
     );
 
-    let root =
-      ctx.resolve_path(UrlResolveKind::Category(name), UrlResolveKind::Root);
+    let root = ctx.resolve_path(
+      UrlResolveKind::Category { category: name },
+      UrlResolveKind::Root,
+    );
 
     let html_head_ctx = HtmlHeadCtx::new(ctx, &root, Some(name), None);
 
@@ -515,8 +520,11 @@ pub fn generate_symbol_pages_for_module(
 
   let mut generated_pages = Vec::with_capacity(name_partitions.values().len());
 
-  let render_ctx =
-    RenderContext::new(ctx, module_doc_nodes, UrlResolveKind::File(short_path));
+  let render_ctx = RenderContext::new(
+    ctx,
+    module_doc_nodes,
+    UrlResolveKind::File { file: short_path },
+  );
 
   for (name, doc_nodes) in name_partitions {
     let (breadcrumbs_ctx, symbol_group_ctx, toc_ctx, categories_panel) =

src/html/render_context.rs

@@ -199,7 +199,7 @@ impl<'ctx> RenderContext<'ctx> {
           },
         ]
       }
-      UrlResolveKind::Category(category) => {
+      UrlResolveKind::Category { category } => {
         vec![
           BreadcrumbCtx {
             name: index_name,
@@ -217,7 +217,7 @@ impl<'ctx> RenderContext<'ctx> {
           },
         ]
       }
-      UrlResolveKind::File(file) => {
+      UrlResolveKind::File { file } => {
         if file.is_main {
           vec![BreadcrumbCtx {
             name: index_name,
@@ -257,9 +257,10 @@ impl<'ctx> RenderContext<'ctx> {
         if !file.is_main {
           parts.push(BreadcrumbCtx {
             name: file.display_name().to_string(),
-            href: self
-              .ctx
-              .resolve_path(self.current_resolve, UrlResolveKind::File(file)),
+            href: self.ctx.resolve_path(
+              self.current_resolve,
+              UrlResolveKind::File { file },
+            ),
             is_symbol: false,
             is_first_symbol: false,
           });
@@ -268,7 +269,7 @@ impl<'ctx> RenderContext<'ctx> {
             name: category.to_string(),
             href: self.ctx.resolve_path(
               self.current_resolve,
-              UrlResolveKind::Category(category),
+              UrlResolveKind::Category { category },
             ),
             is_symbol: false,
             is_first_symbol: false,
@@ -618,8 +619,11 @@ mod test {
     let render_ctx = RenderContext::new(&ctx, doc_nodes, UrlResolveKind::Root);
     assert_eq!(render_ctx.lookup_symbol_href("foo").unwrap(), "b/foo");
 
-    let render_ctx =
-      RenderContext::new(&ctx, doc_nodes, UrlResolveKind::File(short_path));
+    let render_ctx = RenderContext::new(
+      &ctx,
+      doc_nodes,
+      UrlResolveKind::File { file: short_path },
+    );
     assert_eq!(render_ctx.lookup_symbol_href("foo").unwrap(), "b/foo");
   }
 }

src/html/usage.rs

@@ -233,12 +233,14 @@ impl UsagesCtx {
       move |url: String, custom_file_identifier: Option<String>| {
         RENDER_CONTEXT.with(|ctx| {
           let render_ctx_ptr = *ctx.borrow() as *const RenderContext;
+          assert!(!render_ctx_ptr.is_null());
           // SAFETY: this pointer is valid until destroyed, which is done
           //  after compose is called
           let render_ctx = unsafe { &*render_ctx_ptr };
 
           let usage = DOC_NODES.with(|nodes| {
             let (nodes_ptr, nodes_ptr_len) = *nodes.borrow();
+            assert!(!nodes_ptr.is_null());
             // SAFETY: the pointers are valid until destroyed, which is done
             //  after compose is called
             let doc_nodes = unsafe {

src/html/util.rs

@@ -232,8 +232,12 @@ impl NamespacedGlobalSymbols {
 pub enum UrlResolveKind<'a> {
   Root,
   AllSymbols,
-  Category(&'a str),
-  File(&'a ShortPath),
+  Category {
+    category: &'a str,
+  },
+  File {
+    file: &'a ShortPath,
+  },
   Symbol {
     file: &'a ShortPath,
     symbol: &'a str,
@@ -245,8 +249,8 @@ impl UrlResolveKind<'_> {
     match self {
       UrlResolveKind::Root => None,
       UrlResolveKind::AllSymbols => None,
-      UrlResolveKind::Category(_) => None,
-      UrlResolveKind::File(file) => Some(file),
+      UrlResolveKind::Category { .. } => None,
+      UrlResolveKind::File { file } => Some(file),
       UrlResolveKind::Symbol { file, .. } => Some(file),
     }
   }
@@ -257,7 +261,7 @@ pub fn href_path_resolve(
   target: UrlResolveKind,
 ) -> String {
   let backs = match current {
-    UrlResolveKind::File(file) => "../".repeat(if file.is_main {
+    UrlResolveKind::File { file } => "../".repeat(if file.is_main {
       1
     } else {
       file.path.split('/').count()
@@ -269,12 +273,12 @@ pub fn href_path_resolve(
     }),
     UrlResolveKind::Root => String::new(),
     UrlResolveKind::AllSymbols => String::from("./"),
-    UrlResolveKind::Category(_) => String::from("./"),
+    UrlResolveKind::Category { .. } => String::from("./"),
   };
 
   match target {
     UrlResolveKind::Root => backs,
-    UrlResolveKind::File(target_file) if target_file.is_main => backs,
+    UrlResolveKind::File { file: target_file } if target_file.is_main => backs,
     UrlResolveKind::AllSymbols => format!("{backs}./all_symbols.html"),
     UrlResolveKind::Symbol {
       file: target_file,
@@ -283,10 +287,10 @@ pub fn href_path_resolve(
     } => {
       format!("{backs}./{}/~/{target_symbol}.html", target_file.path)
     }
-    UrlResolveKind::File(target_file) => {
+    UrlResolveKind::File { file: target_file } => {
       format!("{backs}./{}/index.html", target_file.path)
     }
-    UrlResolveKind::Category(category) => {
+    UrlResolveKind::Category { category } => {
       format!("{backs}./{}.html", slugify(category))
     }
   }

tests/html_test.rs

@@ -511,8 +511,11 @@ async fn module_doc() {
   let mut module_docs = vec![];
 
   for (short_path, doc_nodes) in &ctx.doc_nodes {
-    let render_ctx =
-      RenderContext::new(&ctx, doc_nodes, UrlResolveKind::File(short_path));
+    let render_ctx = RenderContext::new(
+      &ctx,
+      doc_nodes,
+      UrlResolveKind::File { file: short_path },
+    );
     let module_doc = jsdoc::ModuleDocCtx::new(&render_ctx, short_path);
 
     module_docs.push(module_doc);