Implement reflection database accessible from lua in roblox builtin

docs/typedefs/Roblox.luau

@@ -1,3 +1,135 @@
+export type DatabaseScriptability = "None" | "Custom" | "Read" | "ReadWrite" | "Write"
+
+export type DatabasePropertyTag =
+	"Deprecated"
+	| "Hidden"
+	| "NotBrowsable"
+	| "NotReplicated"
+	| "NotScriptable"
+	| "ReadOnly"
+	| "WriteOnly"
+
+export type DatabaseClassTag =
+	"Deprecated"
+	| "NotBrowsable"
+	| "NotCreatable"
+	| "NotReplicated"
+	| "PlayerReplicated"
+	| "Service"
+	| "Settings"
+	| "UserSettings"
+
+export type DatabaseProperty = {
+	--[=[
+		The name of the property.
+	]=]
+	Name: string,
+	--[=[
+		The datatype of the property.
+
+		For normal datatypes this will be a string such as `string`, `Color3`, ...
+
+		For enums this will be a string formatted as `Enum.EnumName`.
+	]=]
+	Datatype: string,
+	--[=[
+		The scriptability of this property, meaning if it can be written / read at runtime.
+
+		All properties are writable and readable in Lune even if scriptability is not.
+	]=]
+	Scriptability: DatabaseScriptability,
+	--[=[
+		Tags describing the property.
+
+		These include information such as if the property can be replicated to players
+		at runtime, if the property should be hidden in Roblox Studio, and more.
+	]=]
+	Tags: { DatabasePropertyTag },
+}
+
+export type DatabaseClass = {
+	--[=[
+		The name of the class.
+	]=]
+	Name: string,
+	--[=[
+		The superclass (parent class) of this class.
+
+		May be nil if no parent class exists.
+	]=]
+	Superclass: string?,
+	--[=[
+		Known properties for this class.
+	]=]
+	Properties: { [string]: DatabaseProperty },
+	--[=[
+		Default values for properties of this class.
+
+		Note that these default properties use Lune's built-in datatype
+		userdatas, and that if there is a new datatype that Lune does
+		not yet know about, it may be missing from this table.
+	]=]
+	DefaultProperties: { [string]: any },
+	--[=[
+		Tags describing the class.
+
+		These include information such as if the class can be replicated
+		to players at runtime, and top-level class categories.
+	]=]
+	Tags: { DatabaseClassTag },
+}
+
+export type DatabaseEnum = {
+	--[=[
+		The name of this enum, for example `PartType` or `UserInputState`.
+	]=]
+	Name: string,
+	--[=[
+		Members of this enum.
+
+		Note that this is a direct map of name -> enum values,
+		and does not actually use the EnumItem datatype itself.
+	]=]
+	Items: { [string]: number },
+}
+
+export type Database = {
+	--[=[
+		The current version of the reflection database.
+
+		This will follow the format `x.y.z.w`, which most commonly looks something like `0.567.0.123456789`
+	]=]
+	Version: string,
+	--[=[
+		Retrieves a list of all currently known class names.
+	]=]
+	GetClassNames: (self: Database) -> { string },
+	--[=[
+		Retrieves a list of all currently known enum names.
+	]=]
+	GetEnumNames: (self: Database) -> { string },
+	--[=[
+		Gets a class with the exact given name, if one exists.
+	]=]
+	GetClass: (self: Database, name: string) -> DatabaseClass?,
+	--[=[
+		Gets an enum with the exact given name, if one exists.
+	]=]
+	GetEnum: (self: Database, name: string) -> DatabaseEnum?,
+	--[=[
+		Finds a class with the given name.
+
+		This will use case-insensitive matching and ignore leading and trailing whitespace.
+	]=]
+	FindClass: (self: Database, name: string) -> DatabaseClass?,
+	--[=[
+		Finds an enum with the given name.
+
+		This will use case-insensitive matching and ignore leading and trailing whitespace.
+	]=]
+	FindEnum: (self: Database, name: string) -> DatabaseEnum?,
+}
+
 type InstanceProperties = {
 	Parent: Instance?,
 	ClassName: string,
@@ -219,6 +351,39 @@ return {
 	getAuthCookie = function(raw: boolean?): string?
 		return nil :: any
 	end,
+	--[=[
+		@within Roblox
+		@must_use
+
+		Gets the bundled reflection database.
+
+		This database contains information about Roblox enums, classes, and their properties.
+
+		### Example usage
+
+		```lua
+		local roblox = require("@lune/roblox")
+
+		local db = roblox.getReflectionDatabase()
+
+		print("There are", #db:GetClassNames(), "classes in the reflection database")
+
+		print("All base instance properties:")
+
+		local class = db:GetClass("Instance")
+		for name, prop in class.Properties do
+			print(string.format(
+				"- %s with datatype %s and default value %s",
+				prop.Name,
+				prop.Datatype,
+				tostring(class.DefaultProperties[prop.Name])
+			))
+		end
+		```
+	]=]
+	getReflectionDatabase = function(): Database
+		return nil :: any
+	end,
 	-- TODO: Make typedefs for all of the datatypes as well...
 	Instance = (nil :: any) :: {
 		new: ((className: "DataModel") -> DataModel) & ((className: string) -> Instance),

src/lune/builtins/roblox.rs

@@ -1,14 +1,19 @@
 use mlua::prelude::*;
+use once_cell::sync::OnceCell;
 
 use crate::roblox::{
     self,
     document::{Document, DocumentError, DocumentFormat, DocumentKind},
     instance::Instance,
+    reflection::Database as ReflectionDatabase,
 };
+
 use tokio::task;
 
 use crate::lune::lua::table::TableBuilder;
 
+static REFLECTION_DATABASE: OnceCell<ReflectionDatabase> = OnceCell::new();
+
 pub fn create(lua: &'static Lua) -> LuaResult<LuaTable> {
     let mut roblox_constants = Vec::new();
     let roblox_module = roblox::module(lua)?;
@@ -21,7 +26,8 @@ pub fn create(lua: &'static Lua) -> LuaResult<LuaTable> {
         .with_async_function("deserializeModel", deserialize_model)?
         .with_async_function("serializePlace", serialize_place)?
         .with_async_function("serializeModel", serialize_model)?
-        .with_async_function("getAuthCookie", get_auth_cookie)?
+        .with_function("getAuthCookie", get_auth_cookie)?
+        .with_function("getReflectionDatabase", get_reflection_database)?
         .build_readonly()
 }
 
@@ -85,14 +91,14 @@ async fn serialize_model<'lua>(
     lua.create_string(bytes)
 }
 
-async fn get_auth_cookie(_: &Lua, raw: Option<bool>) -> LuaResult<Option<String>> {
-    task::spawn_blocking(move || {
+fn get_auth_cookie(_: &Lua, raw: Option<bool>) -> LuaResult<Option<String>> {
     if matches!(raw, Some(true)) {
         Ok(rbx_cookie::get_value())
     } else {
         Ok(rbx_cookie::get())
     }
-    })
-    .await
-    .map_err(LuaError::external)?
+}
+
+fn get_reflection_database(_: &Lua, _: ()) -> LuaResult<ReflectionDatabase> {
+    Ok(*REFLECTION_DATABASE.get_or_init(ReflectionDatabase::new))
 }

src/roblox/datatypes/extension.rs

@@ -4,7 +4,7 @@ use crate::roblox::instance::Instance;
 
 use super::*;
 
-pub(super) trait DomValueExt {
+pub(crate) trait DomValueExt {
     fn variant_name(&self) -> Option<&'static str>;
 }
 
@@ -12,6 +12,7 @@ impl DomValueExt for DomType {
     fn variant_name(&self) -> Option<&'static str> {
         use DomType::*;
         Some(match self {
+            Attributes => "Attributes",
             Axes => "Axes",
             BinaryString => "BinaryString",
             Bool => "Bool",
@@ -25,6 +26,7 @@ impl DomValueExt for DomType {
             Faces => "Faces",
             Float32 => "Float32",
             Float64 => "Float64",
+            Font => "Font",
             Int32 => "Int32",
             Int64 => "Int64",
             NumberRange => "NumberRange",
@@ -37,8 +39,10 @@ impl DomValueExt for DomType {
             Region3int16 => "Region3int16",
             SharedString => "SharedString",
             String => "String",
+            Tags => "Tags",
             UDim => "UDim",
             UDim2 => "UDim2",
+            UniqueId => "UniqueId",
             Vector2 => "Vector2",
             Vector2int16 => "Vector2int16",
             Vector3 => "Vector3",

src/roblox/mod.rs

@@ -5,6 +5,7 @@ use crate::roblox::instance::Instance;
 pub mod datatypes;
 pub mod document;
 pub mod instance;
+pub mod reflection;
 
 pub(crate) mod shared;
 

src/roblox/reflection/class.rs

@@ -0,0 +1,148 @@
+use core::fmt;
+use std::collections::HashMap;
+
+use mlua::prelude::*;
+
+use rbx_dom_weak::types::Variant as DomVariant;
+use rbx_reflection::{ClassDescriptor, DataType};
+
+use super::{property::DatabaseProperty, utils::*};
+use crate::roblox::datatypes::{
+    conversion::DomValueToLua, types::EnumItem, userdata_impl_eq, userdata_impl_to_string,
+};
+
+type DbClass = &'static ClassDescriptor<'static>;
+
+/**
+    A wrapper for [`rbx_reflection::ClassDescriptor`] that
+    also provides access to the class descriptor from lua.
+*/
+#[derive(Debug, Clone, Copy)]
+pub struct DatabaseClass(DbClass);
+
+impl DatabaseClass {
+    pub(crate) fn new(inner: DbClass) -> Self {
+        Self(inner)
+    }
+
+    /**
+        Get the name of this class.
+    */
+    pub fn get_name(&self) -> String {
+        self.0.name.to_string()
+    }
+
+    /**
+        Get the superclass (parent class) of this class.
+
+        May be `None` if no parent class exists.
+    */
+    pub fn get_superclass(&self) -> Option<String> {
+        let sup = self.0.superclass.as_ref()?;
+        Some(sup.to_string())
+    }
+
+    /**
+        Get all known properties for this class.
+    */
+    pub fn get_properties(&self) -> HashMap<String, DatabaseProperty> {
+        self.0
+            .properties
+            .iter()
+            .map(|(name, prop)| (name.to_string(), DatabaseProperty::new(self.0, prop)))
+            .collect()
+    }
+
+    /**
+        Get all default values for properties of this class.
+    */
+    pub fn get_defaults(&self) -> HashMap<String, DomVariant> {
+        self.0
+            .default_properties
+            .iter()
+            .map(|(name, prop)| (name.to_string(), prop.clone()))
+            .collect()
+    }
+
+    /**
+        Get all tags describing the class.
+
+        These include information such as if the class can be replicated
+        to players at runtime, and top-level class categories.
+    */
+    pub fn get_tags_str(&self) -> Vec<&'static str> {
+        self.0.tags.iter().map(class_tag_to_str).collect::<Vec<_>>()
+    }
+}
+
+impl LuaUserData for DatabaseClass {
+    fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+        fields.add_field_method_get("Name", |_, this| Ok(this.get_name()));
+        fields.add_field_method_get("Superclass", |_, this| Ok(this.get_superclass()));
+        fields.add_field_method_get("Properties", |_, this| Ok(this.get_properties()));
+        fields.add_field_method_get("DefaultProperties", |lua, this| {
+            let defaults = this.get_defaults();
+            let mut map = HashMap::with_capacity(defaults.len());
+            for (name, prop) in defaults {
+                let value = if let DomVariant::Enum(enum_value) = prop {
+                    make_enum_value(this.0, &name, enum_value.to_u32())
+                        .and_then(|e| e.into_lua(lua))
+                } else {
+                    LuaValue::dom_value_to_lua(lua, &prop).into_lua_err()
+                };
+                if let Ok(value) = value {
+                    map.insert(name, value);
+                }
+            }
+            Ok(map)
+        });
+        fields.add_field_method_get("Tags", |_, this| Ok(this.get_tags_str()));
+    }
+
+    fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_meta_method(LuaMetaMethod::Eq, userdata_impl_eq);
+        methods.add_meta_method(LuaMetaMethod::ToString, userdata_impl_to_string);
+    }
+}
+
+impl PartialEq for DatabaseClass {
+    fn eq(&self, other: &Self) -> bool {
+        self.0.name == other.0.name
+    }
+}
+
+impl fmt::Display for DatabaseClass {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "ReflectionDatabaseClass({})", self.0.name)
+    }
+}
+
+fn find_enum_name(inner: DbClass, name: impl AsRef<str>) -> Option<String> {
+    inner.properties.iter().find_map(|(prop_name, prop_info)| {
+        if prop_name == name.as_ref() {
+            if let DataType::Enum(enum_name) = &prop_info.data_type {
+                Some(enum_name.to_string())
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    })
+}
+
+fn make_enum_value(inner: DbClass, name: impl AsRef<str>, value: u32) -> LuaResult<EnumItem> {
+    let name = name.as_ref();
+    let enum_name = find_enum_name(inner, name).ok_or_else(|| {
+        LuaError::RuntimeError(format!(
+            "Failed to get default property '{}' - No enum descriptor was found",
+            name
+        ))
+    })?;
+    EnumItem::from_enum_name_and_value(&enum_name, value).ok_or_else(|| {
+        LuaError::RuntimeError(format!(
+            "Failed to get default property '{}' - Enum.{} does not contain numeric value {}",
+            name, enum_name, value
+        ))
+    })
+}

src/roblox/reflection/enums.rs

@@ -0,0 +1,67 @@
+use std::{collections::HashMap, fmt};
+
+use mlua::prelude::*;
+
+use rbx_reflection::EnumDescriptor;
+
+use crate::roblox::datatypes::{userdata_impl_eq, userdata_impl_to_string};
+
+type DbEnum = &'static EnumDescriptor<'static>;
+
+/**
+    A wrapper for [`rbx_reflection::EnumDescriptor`] that
+    also provides access to the class descriptor from lua.
+*/
+#[derive(Debug, Clone, Copy)]
+pub struct DatabaseEnum(DbEnum);
+
+impl DatabaseEnum {
+    pub(crate) fn new(inner: DbEnum) -> Self {
+        Self(inner)
+    }
+
+    /**
+        Get the name of this enum.
+    */
+    pub fn get_name(&self) -> String {
+        self.0.name.to_string()
+    }
+
+    /**
+        Get all known members of this enum.
+
+        Note that this is a direct map of name -> enum values,
+        and does not actually use the EnumItem datatype itself.
+    */
+    pub fn get_items(&self) -> HashMap<String, u32> {
+        self.0
+            .items
+            .iter()
+            .map(|(k, v)| (k.to_string(), *v))
+            .collect()
+    }
+}
+
+impl LuaUserData for DatabaseEnum {
+    fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+        fields.add_field_method_get("Name", |_, this| Ok(this.get_name()));
+        fields.add_field_method_get("Items", |_, this| Ok(this.get_items()));
+    }
+
+    fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_meta_method(LuaMetaMethod::Eq, userdata_impl_eq);
+        methods.add_meta_method(LuaMetaMethod::ToString, userdata_impl_to_string);
+    }
+}
+
+impl PartialEq for DatabaseEnum {
+    fn eq(&self, other: &Self) -> bool {
+        self.0.name == other.0.name
+    }
+}
+
+impl fmt::Display for DatabaseEnum {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "ReflectionDatabaseEnum({})", self.0.name)
+    }
+}

src/roblox/reflection/mod.rs

@@ -0,0 +1,138 @@
+use std::fmt;
+
+use mlua::prelude::*;
+
+use rbx_reflection::ReflectionDatabase;
+
+use crate::roblox::datatypes::userdata_impl_eq;
+
+mod class;
+mod enums;
+mod property;
+mod utils;
+
+pub use class::DatabaseClass;
+pub use enums::DatabaseEnum;
+pub use property::DatabaseProperty;
+
+use super::datatypes::userdata_impl_to_string;
+
+type Db = &'static ReflectionDatabase<'static>;
+
+/**
+    A wrapper for [`rbx_reflection::ReflectionDatabase`] that
+    also provides access to the reflection database from lua.
+*/
+#[derive(Debug, Clone, Copy)]
+pub struct Database(Db);
+
+impl Database {
+    /**
+        Creates a new database struct, referencing the bundled reflection database.
+    */
+    pub fn new() -> Self {
+        Self(rbx_reflection_database::get())
+    }
+
+    /**
+        Get the version string of the database.
+
+        This will follow the format `x.y.z.w`, which most
+        commonly looks something like `0.567.0.123456789`.
+    */
+    pub fn get_version(&self) -> String {
+        let [x, y, z, w] = self.0.version;
+        format!("{x}.{y}.{z}.{w}")
+    }
+
+    /**
+        Retrieves a list of all currently known enum names.
+    */
+    pub fn get_enum_names(&self) -> Vec<String> {
+        self.0.enums.keys().map(|e| e.to_string()).collect()
+    }
+
+    /**
+        Retrieves a list of all currently known class names.
+    */
+    pub fn get_class_names(&self) -> Vec<String> {
+        self.0.classes.keys().map(|e| e.to_string()).collect()
+    }
+
+    /**
+        Gets an enum with the exact given name, if one exists.
+    */
+    pub fn get_enum(&self, name: impl AsRef<str>) -> Option<DatabaseEnum> {
+        let e = self.0.enums.get(name.as_ref())?;
+        Some(DatabaseEnum::new(e))
+    }
+
+    /**
+        Gets a class with the exact given name, if one exists.
+    */
+    pub fn get_class(&self, name: impl AsRef<str>) -> Option<DatabaseClass> {
+        let c = self.0.classes.get(name.as_ref())?;
+        Some(DatabaseClass::new(c))
+    }
+
+    /**
+        Finds an enum with the given name.
+
+        This will use case-insensitive matching and ignore leading and trailing whitespace.
+    */
+    pub fn find_enum(&self, name: impl AsRef<str>) -> Option<DatabaseEnum> {
+        let name = name.as_ref().trim().to_lowercase();
+        let (ename, _) = self
+            .0
+            .enums
+            .iter()
+            .find(|(ename, _)| ename.trim().to_lowercase() == name)?;
+        self.get_enum(ename)
+    }
+
+    /**
+        Finds a class with the given name.
+
+        This will use case-insensitive matching and ignore leading and trailing whitespace.
+    */
+    pub fn find_class(&self, name: impl AsRef<str>) -> Option<DatabaseClass> {
+        let name = name.as_ref().trim().to_lowercase();
+        let (cname, _) = self
+            .0
+            .classes
+            .iter()
+            .find(|(cname, _)| cname.trim().to_lowercase() == name)?;
+        self.get_class(cname)
+    }
+}
+
+impl LuaUserData for Database {
+    fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+        fields.add_field_method_get("Version", |_, this| Ok(this.get_version()))
+    }
+
+    fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_meta_method(LuaMetaMethod::Eq, userdata_impl_eq);
+        methods.add_meta_method(LuaMetaMethod::ToString, userdata_impl_to_string);
+        methods.add_method("GetEnumNames", |_, this, _: ()| Ok(this.get_enum_names()));
+        methods.add_method("GetClassNames", |_, this, _: ()| Ok(this.get_class_names()));
+        methods.add_method("GetEnum", |_, this, name: String| Ok(this.get_enum(name)));
+        methods.add_method("GetClass", |_, this, name: String| Ok(this.get_class(name)));
+        methods.add_method("FindEnum", |_, this, name: String| Ok(this.find_enum(name)));
+        methods.add_method("FindClass", |_, this, name: String| {
+            Ok(this.find_class(name))
+        });
+    }
+}
+
+impl PartialEq for Database {
+    fn eq(&self, _other: &Self) -> bool {
+        true // All database userdatas refer to the same underlying rbx-dom database
+    }
+}
+
+impl fmt::Display for Database {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "ReflectionDatabase")
+    }
+}

src/roblox/reflection/property.rs

@@ -0,0 +1,95 @@
+use std::fmt;
+
+use mlua::prelude::*;
+
+use rbx_reflection::{ClassDescriptor, PropertyDescriptor};
+
+use super::utils::*;
+use crate::roblox::datatypes::{userdata_impl_eq, userdata_impl_to_string};
+
+type DbClass = &'static ClassDescriptor<'static>;
+type DbProp = &'static PropertyDescriptor<'static>;
+
+/**
+    A wrapper for [`rbx_reflection::PropertyDescriptor`] that
+    also provides access to the property descriptor from lua.
+*/
+#[derive(Debug, Clone, Copy)]
+pub struct DatabaseProperty(DbClass, DbProp);
+
+impl DatabaseProperty {
+    pub(crate) fn new(inner: DbClass, inner_prop: DbProp) -> Self {
+        Self(inner, inner_prop)
+    }
+
+    /**
+        Get the name of this property.
+    */
+    pub fn get_name(&self) -> String {
+        self.1.name.to_string()
+    }
+
+    /**
+        Get the datatype name of the property.
+
+        For normal datatypes this will be a string such as `string`, `Color3`, ...
+
+        For enums this will be a string formatted as `Enum.EnumName`.
+    */
+    pub fn get_datatype_name(&self) -> String {
+        data_type_to_str(self.1.data_type.clone())
+    }
+
+    /**
+        Get the scriptability of this property, meaning if it can be written / read at runtime.
+
+        All properties are writable and readable in Lune even if scriptability is not.
+    */
+    pub fn get_scriptability_str(&self) -> &'static str {
+        scriptability_to_str(&self.1.scriptability)
+    }
+
+    /**
+        Get all known tags describing the property.
+
+        These include information such as if the property can be replicated to players
+        at runtime, if the property should be hidden in Roblox Studio, and more.
+    */
+    pub fn get_tags_str(&self) -> Vec<&'static str> {
+        self.1
+            .tags
+            .iter()
+            .map(property_tag_to_str)
+            .collect::<Vec<_>>()
+    }
+}
+
+impl LuaUserData for DatabaseProperty {
+    fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
+        fields.add_field_method_get("Name", |_, this| Ok(this.get_name()));
+        fields.add_field_method_get("Datatype", |_, this| Ok(this.get_datatype_name()));
+        fields.add_field_method_get("Scriptability", |_, this| Ok(this.get_scriptability_str()));
+        fields.add_field_method_get("Tags", |_, this| Ok(this.get_tags_str()));
+    }
+
+    fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_meta_method(LuaMetaMethod::Eq, userdata_impl_eq);
+        methods.add_meta_method(LuaMetaMethod::ToString, userdata_impl_to_string);
+    }
+}
+
+impl PartialEq for DatabaseProperty {
+    fn eq(&self, other: &Self) -> bool {
+        self.0.name == other.0.name && self.1.name == other.1.name
+    }
+}
+
+impl fmt::Display for DatabaseProperty {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "ReflectionDatabaseProperty({} > {})",
+            self.0.name, self.1.name
+        )
+    }
+}

src/roblox/reflection/utils.rs

@@ -0,0 +1,56 @@
+use rbx_reflection::{ClassTag, DataType, PropertyTag, Scriptability};
+
+use crate::roblox::datatypes::extension::DomValueExt;
+
+pub fn data_type_to_str(data_type: DataType) -> String {
+    match data_type {
+        DataType::Enum(e) => format!("Enum.{e}"),
+        DataType::Value(v) => v
+            .variant_name()
+            .expect("Encountered unknown data type variant")
+            .to_string(),
+        _ => panic!("Encountered unknown data type"),
+    }
+}
+
+/*
+     NOTE: Remember to add any new strings here to typedefs too!
+*/
+
+pub fn scriptability_to_str(scriptability: &Scriptability) -> &'static str {
+    match scriptability {
+        Scriptability::None => "None",
+        Scriptability::Custom => "Custom",
+        Scriptability::Read => "Read",
+        Scriptability::ReadWrite => "ReadWrite",
+        Scriptability::Write => "Write",
+        _ => panic!("Encountered unknown scriptability"),
+    }
+}
+
+pub fn property_tag_to_str(tag: &PropertyTag) -> &'static str {
+    match tag {
+        PropertyTag::Deprecated => "Deprecated",
+        PropertyTag::Hidden => "Hidden",
+        PropertyTag::NotBrowsable => "NotBrowsable",
+        PropertyTag::NotReplicated => "NotReplicated",
+        PropertyTag::NotScriptable => "NotScriptable",
+        PropertyTag::ReadOnly => "ReadOnly",
+        PropertyTag::WriteOnly => "WriteOnly",
+        _ => panic!("Encountered unknown property tag"),
+    }
+}
+
+pub fn class_tag_to_str(tag: &ClassTag) -> &'static str {
+    match tag {
+        ClassTag::Deprecated => "Deprecated",
+        ClassTag::NotBrowsable => "NotBrowsable",
+        ClassTag::NotCreatable => "NotCreatable",
+        ClassTag::NotReplicated => "NotReplicated",
+        ClassTag::PlayerReplicated => "PlayerReplicated",
+        ClassTag::Service => "Service",
+        ClassTag::Settings => "Settings",
+        ClassTag::UserSettings => "UserSettings",
+        _ => panic!("Encountered unknown class tag"),
+    }
+}

src/tests.rs

@@ -158,4 +158,9 @@ create_tests! {
     roblox_instance_methods_is_descendant_of: "roblox/instance/methods/IsDescendantOf",
 
     roblox_misc_typeof: "roblox/misc/typeof",
+
+    roblox_reflection_class: "roblox/reflection/class",
+    roblox_reflection_database: "roblox/reflection/database",
+    roblox_reflection_enums: "roblox/reflection/enums",
+    roblox_reflection_property: "roblox/reflection/property",
 }

tests/roblox/reflection/class.luau

@@ -0,0 +1,41 @@
+local roblox = require("@lune/roblox")
+
+local db = roblox.getReflectionDatabase()
+
+-- Make sure database classes exist + fields / properties are correct types
+
+for _, className in db:GetClassNames() do
+	local class = db:GetClass(className)
+	assert(class ~= nil, "Missing " .. className .. " class in database")
+	assert(type(class.Name) == "string", "Name property must be a string")
+	assert(
+		class.Superclass == nil or type(class.Superclass) == "string",
+		"Superclass property must be nil or a string"
+	)
+	assert(type(class.Properties) == "table", "Properties property must be a table")
+	assert(type(class.DefaultProperties) == "table", "DefaultProperties property must be a table")
+	assert(type(class.Tags) == "table", "Tags property must be a table")
+end
+
+-- Any property present in default properties must also
+-- be in properties *or* the properties of a superclass
+
+for _, className in db:GetClassNames() do
+	local class = db:GetClass(className)
+	assert(class ~= nil)
+	for name, value in class.DefaultProperties do
+		local found = false
+		local current = class
+		while current ~= nil do
+			if current.Properties[name] ~= nil then
+				found = true
+				break
+			elseif current.Superclass ~= nil then
+				current = db:GetClass(current.Superclass)
+			else
+				break
+			end
+		end
+		assert(found, "Missing default property " .. name .. " in properties table")
+	end
+end

tests/roblox/reflection/database.luau

@@ -0,0 +1,55 @@
+local roblox = require("@lune/roblox")
+
+local db = roblox.getReflectionDatabase()
+local db2 = roblox.getReflectionDatabase()
+
+-- Subsequent calls to getReflectionDatabase should return the same database
+assert(db == db2, "Database should always compare as equal to other database")
+
+-- Database should not be empty
+assert(#db:GetClassNames() > 0, "Database should not be empty (no class names)")
+assert(#db:GetEnumNames() > 0, "Database should not be empty (no enum names)")
+
+-- Make sure our database finds classes correctly
+
+local class = db:GetClass("Instance")
+assert(class ~= nil, "Missing Instance class in database")
+local prop = class.Properties.Parent
+assert(prop ~= nil, "Missing Parent property on Instance class in database")
+
+local class2 = db:FindClass("    instance ")
+assert(class2 ~= nil, "Missing Instance class in database (2)")
+local prop2 = class2.Properties.Parent
+assert(prop2 ~= nil, "Missing Parent property on Instance class in database (2)")
+
+assert(class == class2, "Class userdatas from the database should compare as equal")
+assert(prop == prop2, "Property userdatas from the database should compare as equal")
+
+assert(db:GetClass("PVInstance") ~= nil, "Missing PVInstance class in database")
+assert(db:GetClass("BasePart") ~= nil, "Missing BasePart class in database")
+assert(db:GetClass("Part") ~= nil, "Missing Part class in database")
+
+-- Make sure our database finds enums correctly
+
+local enum = db:GetEnum("PartType")
+assert(enum ~= nil, "Missing PartType enum in database")
+
+local enum2 = db:FindEnum("   parttype ")
+assert(enum2 ~= nil, "Missing PartType enum in database (2)")
+
+assert(enum == enum2, "Enum userdatas from the database should compare as equal")
+
+assert(db:GetEnum("UserInputType") ~= nil, "Missing UserInputType enum in database")
+assert(db:GetEnum("NormalId") ~= nil, "Missing NormalId enum in database")
+assert(db:GetEnum("Font") ~= nil, "Missing Font enum in database")
+
+-- All the class and enum names gotten from the database should be accessible
+
+for _, className in db:GetClassNames() do
+	assert(db:GetClass(className) ~= nil, "Missing " .. className .. " class in database (3)")
+	assert(db:FindClass(className) ~= nil, "Missing " .. className .. " class in database (4)")
+end
+for _, enumName in db:GetEnumNames() do
+	assert(db:GetEnum(enumName) ~= nil, "Missing " .. enumName .. " enum in database (3)")
+	assert(db:FindEnum(enumName) ~= nil, "Missing " .. enumName .. " enum in database (4)")
+end

tests/roblox/reflection/enums.luau

@@ -0,0 +1,32 @@
+local roblox = require("@lune/roblox")
+
+local db = roblox.getReflectionDatabase()
+
+-- Make sure database enums exist + fields / properties are correct types
+
+for _, enumName in db:GetEnumNames() do
+	local enum = db:GetEnum(enumName)
+	assert(enum ~= nil, "Missing " .. enumName .. " enum in database")
+	assert(type(enum.Name) == "string", "Name property must be a string")
+	assert(type(enum.Items) == "table", "Items property must be a table")
+end
+
+-- Enum items should be a non-empty map of string -> positive integer values
+
+for _, enumName in db:GetEnumNames() do
+	local enum = db:GetEnum(enumName)
+	assert(enum ~= nil)
+	local empty = true
+	for name, value in enum.Items do
+		assert(
+			type(name) == "string" and #name > 0,
+			"Enum items map must only contain non-empty string keys"
+		)
+		assert(
+			type(value) == "number" and value >= 0 and math.floor(value) == value,
+			"Enum items map must only contain positive integer values"
+		)
+		empty = false
+	end
+	assert(not empty, "Enum items map must not be empty")
+end

tests/roblox/reflection/property.luau

@@ -0,0 +1,17 @@
+local roblox = require("@lune/roblox")
+
+local db = roblox.getReflectionDatabase()
+
+-- Make sure database class properties exist + their fields / properties are correct types
+
+for _, className in db:GetClassNames() do
+	local class = db:GetClass(className)
+	assert(class ~= nil)
+
+	for name, prop in class.Properties do
+		assert(type(prop.Name) == "string", "Name property must be a string")
+		assert(type(prop.Datatype) == "string", "Datatype property must be a string")
+		assert(type(prop.Scriptability) == "string", "Scriptability property must be a string")
+		assert(type(prop.Tags) == "table", "Tags property must be a table")
+	end
+end