LibWeb: Implement Element.innerText

Reading the property has a few warts (see FIXMEs in the included
tests), but with this the timestamps on http://45.33.8.238/
get localized :^)

Since the Date() constructor currently ignores all arguments,
they don't get localized correctly but are all set to the current
time, but hey, it's still progress from a certain point of view.

3 files changed, 38 insertions, 0 deletions

diff --git a/Libraries/LibWeb/DOM/Element.cpp b/Libraries/LibWeb/DOM/Element.cpp
index 19cc1733ad..b5445ab593 100644
--- a/Libraries/LibWeb/DOM/Element.cpp
+++ b/Libraries/LibWeb/DOM/Element.cpp
@@ -41,6 +41,7 @@
 #include <LibWeb/Layout/LayoutTableCell.h>
 #include <LibWeb/Layout/LayoutTableRow.h>
 #include <LibWeb/Layout/LayoutTableRowGroup.h>
+#include <LibWeb/Layout/LayoutText.h>
 #include <LibWeb/Layout/LayoutTreeBuilder.h>
 
 namespace Web::DOM {
@@ -295,6 +296,39 @@ String Element::inner_html() const
     return builder.to_string();
 }
 
+void Element::set_inner_text(StringView text)
+{
+    remove_all_children();
+    append_child(document().create_text_node(text));
+
+    set_needs_style_update(true);
+    document().schedule_style_update();
+    document().invalidate_layout();
+}
+
+String Element::inner_text()
+{
+    StringBuilder builder;
+
+    // innerText for element being rendered takes visibility into account, so force a layout and then walk the layout tree.
+    document().layout();
+    if (!layout_node())
+        return text_content();
+
+    Function<void(const LayoutNode&)> recurse = [&](auto& node) {
+        for (auto* child = node.first_child(); child; child = child->next_sibling()) {
+            if (child->is_text())
+                builder.append(downcast<LayoutText>(*child).text_for_rendering());
+            if (child->is_break())
+                builder.append('\n');
+            recurse(*child);
+        }
+    };
+    recurse(*layout_node());
+
+    return builder.to_string();
+}
+
 bool Element::is_focused() const
 {
     return document().focused_element() == this;
diff --git a/Libraries/LibWeb/DOM/Element.h b/Libraries/LibWeb/DOM/Element.h
index b08ff34e42..253f532aff 100644
--- a/Libraries/LibWeb/DOM/Element.h
+++ b/Libraries/LibWeb/DOM/Element.h
@@ -87,6 +87,9 @@ public:
     String inner_html() const;
     void set_inner_html(StringView);
 
+    String inner_text();
+    void set_inner_text(StringView);
+
     bool is_focused() const;
     virtual bool is_focusable() const { return false; }
 
diff --git a/Libraries/LibWeb/DOM/Element.idl b/Libraries/LibWeb/DOM/Element.idl
index 082d0a951a..34baef070e 100644
--- a/Libraries/LibWeb/DOM/Element.idl
+++ b/Libraries/LibWeb/DOM/Element.idl
@@ -9,6 +9,7 @@ interface Element : Node {
     ArrayFromVector querySelectorAll(DOMString selectors);
 
     attribute DOMString innerHTML;
+    attribute DOMString innerText;
     [Reflect] attribute DOMString id;
     [Reflect=class] attribute DOMString className;