tools: add [src] links to async_hooks.html

handle ES2015 Class, contructor, and instance methods

unrelated: update Makefile so that generated HTML is out of date whenever
tools/doc/apilinks.js is updated.

PR-URL: https://github.com/nodejs/node/pull/22656
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Makefile

@@ -653,10 +653,12 @@ out/apilinks.json: $(wildcard lib/*.js) tools/doc/apilinks.js
 	$(call available-node, $(gen-apilink))
 
 out/doc/api/%.json out/doc/api/%.html: doc/api/%.md tools/doc/generate.js \
-	tools/doc/html.js tools/doc/json.js | out/apilinks.json
+	tools/doc/html.js tools/doc/json.js tools/doc/apilinks.js | \
+	out/apilinks.json
 	$(call available-node, $(gen-api))
 
-out/doc/api/all.html: $(apidocs_html) tools/doc/allhtml.js
+out/doc/api/all.html: $(apidocs_html) tools/doc/allhtml.js \
+	tools/doc/apilinks.js
 	$(call available-node, tools/doc/allhtml.js)
 
 out/doc/api/all.json: $(apidocs_json) tools/doc/alljson.js

test/fixtures/apilinks/class.js

@@ -0,0 +1,12 @@
+'use strict';
+
+// An exported class using ES2015 class syntax.
+
+class Class {
+  constructor() {};
+  method() {};
+}
+
+module.exports = {
+  Class
+};

test/fixtures/apilinks/class.json

@@ -0,0 +1,5 @@
+{
+  "Class": "class.js#L5",
+  "new Class": "class.js#L6",
+  "class.method": "class.js#L7"
+}

tools/doc/apilinks.js

@@ -107,6 +107,7 @@ process.argv.slice(2).forEach((file) => {
   //   ClassName.foo = ...;
   //   ClassName.prototype.foo = ...;
   //   function Identifier(...) {...};
+  //   class Foo {...}
   //
   const indirect = {};
 
@@ -153,6 +154,24 @@ process.argv.slice(2).forEach((file) => {
       if (basename.startsWith('_')) return;
       definition[`${basename}.${name}`] =
         `${link}#L${statement.loc.start.line}`;
+
+    } else if (statement.type === 'ClassDeclaration') {
+      if (!exported.constructors.includes(statement.id.name)) return;
+      definition[statement.id.name] = `${link}#L${statement.loc.start.line}`;
+
+      const name = statement.id.name.slice(0, 1).toLowerCase() +
+                  statement.id.name.slice(1);
+
+      statement.body.body.forEach((defn) => {
+        if (defn.type !== 'MethodDefinition') return;
+        if (defn.kind === 'method') {
+          definition[`${name}.${defn.key.name}`] =
+            `${link}#L${defn.loc.start.line}`;
+        } else if (defn.kind === 'constructor') {
+          definition[`new ${statement.id.name}`] =
+            `${link}#L${defn.loc.start.line}`;
+        }
+      });
     }
   });