From 317737fa34f8fe0690e0fd6fddedbdd5fb14db7a Mon Sep 17 00:00:00 2001
From: Witold Filipczyk <witekfl@poczta.onet.pl>
Date: Sat, 27 Jan 2024 15:23:09 +0100
Subject: [PATCH] [spidermonkey] element.offsetTop

---
 src/ecmascript/spidermonkey/element.cpp | 96 +++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

diff --git a/src/ecmascript/spidermonkey/element.cpp b/src/ecmascript/spidermonkey/element.cpp
index 360608a3a..189537324 100644
--- a/src/ecmascript/spidermonkey/element.cpp
+++ b/src/ecmascript/spidermonkey/element.cpp
@@ -94,6 +94,7 @@ static bool element_get_property_nodeType(JSContext *ctx, unsigned int argc, JS:
 static bool element_get_property_nodeValue(JSContext *ctx, unsigned int argc, JS::Value *vp);
 static bool element_get_property_offsetLeft(JSContext *ctx, unsigned int argc, JS::Value *vp);
 static bool element_get_property_offsetParent(JSContext *ctx, unsigned int argc, JS::Value *vp);
+static bool element_get_property_offsetTop(JSContext *ctx, unsigned int argc, JS::Value *vp);
 static bool element_get_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp);
 static bool element_set_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp);
 static bool element_get_property_ownerDocument(JSContext *ctx, unsigned int argc, JS::Value *vp);
@@ -174,6 +175,7 @@ JSPropertySpec element_props[] = {
 	JS_PSG("nodeValue",	element_get_property_nodeValue, JSPROP_ENUMERATE),
 	JS_PSG("offsetLeft",	element_get_property_offsetLeft, JSPROP_ENUMERATE),
 	JS_PSG("offsetParent",	element_get_property_offsetParent, JSPROP_ENUMERATE),
+	JS_PSG("offsetTop",	element_get_property_offsetTop, JSPROP_ENUMERATE),
 	JS_PSGS("outerHTML",	element_get_property_outerHtml, element_set_property_outerHtml, JSPROP_ENUMERATE),
 	JS_PSG("ownerDocument",	element_get_property_ownerDocument, JSPROP_ENUMERATE),
 	JS_PSG("parentElement",	element_get_property_parentElement, JSPROP_ENUMERATE),
@@ -1713,6 +1715,100 @@ element_get_property_offsetParent(JSContext *ctx, unsigned int argc, JS::Value *
 	return true;
 }
 
+static bool
+element_get_property_offsetTop(JSContext *ctx, unsigned int argc, JS::Value *vp)
+{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s\n", __FILE__, __FUNCTION__);
+#endif
+	JS::CallArgs args = CallArgsFromVp(argc, vp);
+	JS::RootedObject hobj(ctx, &args.thisv().toObject());
+
+	struct view_state *vs;
+	JS::Realm *comp = js::GetContextRealm(ctx);
+
+	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
+	struct ecmascript_interpreter *interpreter = (struct ecmascript_interpreter *)JS::GetRealmPrivate(comp);
+
+	/* This can be called if @obj if not itself an instance of the
+	 * appropriate class but has one in its prototype chain.  Fail
+	 * such calls.  */
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
+	vs = interpreter->vs;
+
+	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
+	dom_node *el = (dom_node *)JS::GetMaybePtrFromReservedSlot<dom_node>(hobj, 0);
+
+	if (!el) {
+		args.rval().setNull();
+		return true;
+	}
+	struct document_view *doc_view = vs->doc_view;
+	struct document *document = doc_view->document;
+	struct session *ses;
+
+	if (!document) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	int offset = find_offset(document->element_map_rev, el);
+
+	if (offset <= 0) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	struct node_rect *rect = get_element_rect(document, offset);
+
+	if (!rect) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	ses = doc_view->session;
+
+	if (!ses) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	dom_node *node = NULL;
+	dom_exception exc = dom_node_get_parent_node(el, &node);
+	if (exc != DOM_NO_ERR || !node) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	int offset_parent = find_offset(document->element_map_rev, node);
+
+	if (offset_parent <= 0) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	struct node_rect *rect_parent = get_element_rect(document, offset_parent);
+
+	if (!rect_parent) {
+		args.rval().setInt32(0);
+		return true;
+	}
+	int dy = int_max(0, (rect->y0 - rect_parent->y0) * ses->tab->term->cell_height);
+	dom_node_unref(node);
+	args.rval().setInt32(dy);
+
+	return true;
+}
+
 
 static bool
 element_get_property_ownerDocument(JSContext *ctx, unsigned int argc, JS::Value *vp)