From 188f63941c9af1bb896e979daddba4627aac0de9 Mon Sep 17 00:00:00 2001
From: Witold Filipczyk <witekfl@poczta.onet.pl>
Date: Mon, 11 Sep 2023 15:48:18 +0200
Subject: [PATCH] [spidermonkey] element.focus()

---
 src/document/document.cpp                     | 19 ++++++
 src/document/document.h                       |  4 ++
 .../libdom/spidermonkey/element.cpp           | 67 +++++++++++++++++++
 3 files changed, 90 insertions(+)

diff --git a/src/document/document.cpp b/src/document/document.cpp
index 8ae7fdaf..c20f2955 100644
--- a/src/document/document.cpp
+++ b/src/document/document.cpp
@@ -60,6 +60,7 @@
 #include "document/html/renderer.h"
 #include "document/options.h"
 #include "document/refresh.h"
+#include "document/renderer.h"
 
 #ifdef CONFIG_ECMASCRIPT
 #include "ecmascript/ecmascript.h"
@@ -621,6 +622,24 @@ done_documents(struct module *module)
 	free_table_cache();
 }
 
+#ifdef CONFIG_ECMASCRIPT
+int
+get_link_number_by_offset(struct document *document, int offset)
+{
+	int link;
+
+	if (!document->links_sorted) sort_links(document);
+
+	for (link = 0; link < document->nlinks; link++) {
+		if (document->links[link].element_offset == offset) {
+			return link;
+		}
+	}
+
+	return -1;
+}
+#endif
+
 struct module document_module = struct_module(
 	/* Because this module is listed in main_modules rather than
 	 * in builtin_modules, its name does not appear in the user
diff --git a/src/document/document.h b/src/document/document.h
index 893f6a49..b76122dd 100644
--- a/src/document/document.h
+++ b/src/document/document.h
@@ -349,6 +349,10 @@ int get_format_cache_refresh_count(void);
 
 void shrink_format_cache(int);
 
+#ifdef CONFIG_ECMASCRIPT
+int get_link_number_by_offset(struct document *document, int offset);
+#endif
+
 extern struct module document_module;
 
 /** @todo FIXME: support for entities and all Unicode characters.
diff --git a/src/ecmascript/libdom/spidermonkey/element.cpp b/src/ecmascript/libdom/spidermonkey/element.cpp
index 8f1fc1b1..ce746852 100644
--- a/src/ecmascript/libdom/spidermonkey/element.cpp
+++ b/src/ecmascript/libdom/spidermonkey/element.cpp
@@ -24,6 +24,7 @@
 #include "document/document.h"
 #include "document/forms.h"
 #include "document/libdom/corestrings.h"
+#include "document/libdom/mapa.h"
 #include "document/view.h"
 #include "ecmascript/ecmascript.h"
 #include "ecmascript/spidermonkey/attr.h"
@@ -2708,6 +2709,7 @@ static bool element_appendChild(JSContext *ctx, unsigned int argc, JS::Value *rv
 static bool element_cloneNode(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool element_closest(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool element_contains(JSContext *ctx, unsigned int argc, JS::Value *rval);
+static bool element_focus(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool element_getAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool element_getAttributeNode(JSContext *ctx, unsigned int argc, JS::Value *rval);
 static bool element_getElementsByTagName(JSContext *ctx, unsigned int argc, JS::Value *rval);
@@ -2732,6 +2734,7 @@ const spidermonkeyFunctionSpec element_funcs[] = {
 	{ "cloneNode",	element_cloneNode,	1 },
 	{ "closest",	element_closest,	1 },
 	{ "contains",	element_contains,	1 },
+	{ "focus",	element_focus,		0 },
 	{ "getAttribute",	element_getAttribute,	1 },
 	{ "getAttributeNode",	element_getAttributeNode,	1 },
 	{ "getElementsByTagName",	element_getElementsByTagName,	1 },
@@ -3176,6 +3179,70 @@ element_contains(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	return true;
 }
 
+static bool
+element_focus(JSContext *ctx, unsigned int argc, JS::Value *rval)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	JS::Realm *comp = js::GetContextRealm(ctx);
+
+	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
+
+	JS::CallArgs args = CallArgsFromVp(argc, rval);
+	JS::RootedObject hobj(ctx, &args.thisv().toObject());
+
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
+	args.rval().setUndefined();
+	struct ecmascript_interpreter *interpreter = (struct ecmascript_interpreter *)JS::GetRealmPrivate(comp);
+	struct view_state *vs = interpreter->vs;
+
+	if (!vs) {
+		return true;
+	}
+
+	struct document_view *doc_view = vs->doc_view;
+
+	if (!doc_view) {
+		return true;
+	}
+
+	struct document *doc = doc_view->document;
+
+	if (!doc) {
+		return true;
+	}
+	dom_node *el = (dom_node *)JS::GetMaybePtrFromReservedSlot<dom_node>(hobj, 0);
+
+	if (!el) {
+		return true;
+	}
+	int offset = find_offset(doc->element_map_rev, el);
+
+	if (offset < 0) {
+		return true;
+	}
+
+	int linknum = get_link_number_by_offset(doc, offset);
+
+	if (linknum < 0) {
+		return true;
+	}
+	jump_to_link_number(doc_view->session, doc_view, linknum);
+
+	return true;
+}
+
 static bool
 element_getAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 {