Inspector: Expand and show properties in a TreeView

This allows the inspector to show arbitrary json structures.

DevTools/Inspector/RemoteObjectPropertyModel.cpp

@@ -33,9 +33,22 @@ RemoteObjectPropertyModel::RemoteObjectPropertyModel(RemoteObject& object)
 {
 }
 
-int RemoteObjectPropertyModel::row_count(const GUI::ModelIndex&) const
+int RemoteObjectPropertyModel::row_count(const GUI::ModelIndex& index) const
 {
-    return m_properties.size();
+    Function<int(const JsonValue&)> do_count = [&](const JsonValue& value) {
+        if (value.is_array())
+            return value.as_array().size();
+        else if (value.is_object())
+            return value.as_object().size();
+        return 0;
+    };
+
+    if (index.is_valid()) {
+        auto* path = static_cast<const JsonPath*>(index.internal_data());
+        return do_count(path->resolve(m_object.json));
+    } else {
+        return do_count(m_object.json);
+    }
 }
 
 String RemoteObjectPropertyModel::column_name(int column) const
@@ -51,13 +64,22 @@ String RemoteObjectPropertyModel::column_name(int column) const
 
 GUI::Variant RemoteObjectPropertyModel::data(const GUI::ModelIndex& index, Role role) const
 {
-    auto& property = m_properties[index.row()];
+    auto* path = static_cast<const JsonPath*>(index.internal_data());
+    if (!path)
+        return {};
+
     if (role == Role::Display) {
         switch (index.column()) {
         case Column::Name:
-            return property.name;
-        case Column::Value:
-            return property.value.to_string();
+            return path->last().to_string();
+        case Column::Value: {
+            auto data = path->resolve(m_object.json);
+            if (data.is_array())
+                return String::format("<Array with %d element%s", data.as_array().size(), data.as_array().size() == 1 ? ">" : "s>");
+            if (data.is_object())
+                return String::format("<Object with %d entrie%s", data.as_object().size(), data.as_object().size() == 1 ? ">" : "s>");
+            return data;
+        }
         }
     }
     return {};
@@ -65,18 +87,151 @@ GUI::Variant RemoteObjectPropertyModel::data(const GUI::ModelIndex& index, Role
 
 void RemoteObjectPropertyModel::update()
 {
-    m_properties.clear();
-    m_object.json.for_each_member([this](auto& name, auto& value) {
-        m_properties.append({ name, value });
-    });
     did_update();
 }
 
 void RemoteObjectPropertyModel::set_data(const GUI::ModelIndex& index, const GUI::Variant& new_value)
 {
-    auto& property = m_properties[index.row()];
+    if (!index.is_valid())
+        return;
+
+    auto* path = static_cast<const JsonPath*>(index.internal_data());
+    if (path->size() != 1)
+        return;
+
     FlatPtr address = m_object.address;
-    RemoteProcess::the().set_property(address, property.name.to_string(), new_value.to_string());
-    property.value = new_value.to_string();
+    RemoteProcess::the().set_property(address, path->first().to_string(), new_value.to_string());
     did_update();
 }
+
+GUI::ModelIndex RemoteObjectPropertyModel::index(int row, int column, const GUI::ModelIndex& parent) const
+{
+    const auto& parent_path = parent.is_valid() ? *static_cast<const JsonPath*>(parent.internal_data()) : JsonPath {};
+
+    auto nth_child = [&](int n, const JsonValue& value) -> const JsonPath* {
+        auto path = make<JsonPath>();
+        path->append(parent_path);
+        int row_index = n;
+        if (value.is_object()) {
+            String property_name;
+            auto& object = value.as_object();
+            object.for_each_member([&](auto& name, auto&) {
+                if (row_index > 0) {
+                    --row_index;
+                } else if (row_index == 0) {
+                    property_name = name;
+                    --row_index;
+                }
+            });
+            if (property_name.is_null())
+                return nullptr;
+
+            path->append({ property_name });
+            m_paths.append(move(path));
+        } else if (value.is_array()) {
+            path->append(JsonPathElement { (size_t)n });
+            m_paths.append(move(path));
+        } else {
+            return nullptr;
+        }
+        return &m_paths.last();
+    };
+
+    if (!parent.is_valid()) {
+        if (m_object.json.is_empty())
+            return {};
+    }
+
+    auto index_path = cached_path_at(row, parent_path);
+
+    if (!index_path)
+        index_path = nth_child(row, parent_path.resolve(m_object.json));
+
+    if (!index_path)
+        return {};
+
+    return create_index(row, column, index_path);
+}
+
+GUI::ModelIndex RemoteObjectPropertyModel::parent_index(const GUI::ModelIndex& index) const
+{
+    if (!index.is_valid())
+        return index;
+
+    auto path = *static_cast<const JsonPath*>(index.internal_data());
+    if (path.is_empty())
+        return {};
+
+    path.take_last();
+    if (path.is_empty())
+        return {};
+
+    auto* cpath = find_cached_path(path);
+    if (cpath) {
+        int index_in_parent = 0;
+        if (cpath->last().kind() == JsonPathElement::Kind::Index)
+            index_in_parent = cpath->last().index();
+        else if (cpath->last().kind() == JsonPathElement::Kind::Key) {
+            auto path_copy = path;
+            auto last = path_copy.take_last();
+            bool found = false;
+            path_copy.resolve(m_object.json).as_object().for_each_member([&](auto& name, auto&) {
+                if (!found) {
+                    if (last.key() == name)
+                        found = true;
+                    else
+                        index_in_parent++;
+                }
+            });
+        }
+        return create_index(index_in_parent, 0, cpath);
+    }
+
+    dbg() << "No cached path found for path " << path.to_string();
+    return {};
+}
+
+const JsonPath* RemoteObjectPropertyModel::cached_path_at(int n, const Vector<JsonPathElement>& prefix) const
+{
+    // FIXME: ModelIndex wants a void*, so we have to keep these
+    //        indices alive, but allocating a new path every time
+    //        we're asked for an index is silly, so we have to look for existing ones first.
+    const JsonPath* index_path = nullptr;
+    int row_index = n;
+    for (auto& path : m_paths) {
+        if (path.size() != prefix.size() + 1)
+            continue;
+
+        for (size_t i = 0; i < prefix.size(); ++i) {
+            if (path[i] != prefix[i])
+                goto do_continue;
+        }
+
+        if (row_index == 0) {
+            index_path = &path;
+            break;
+        }
+        --row_index;
+    do_continue:;
+    }
+
+    return index_path;
+};
+
+const JsonPath* RemoteObjectPropertyModel::find_cached_path(const Vector<JsonPathElement>& path) const
+{
+    for (auto& cpath : m_paths) {
+        if (cpath.size() != path.size())
+            continue;
+
+        for (size_t i = 0; i < cpath.size(); ++i) {
+            if (cpath[i] != path[i])
+                goto do_continue;
+        }
+
+        return &cpath;
+    do_continue:;
+    }
+
+    return nullptr;
+}