Merge pull request 'Replace System Objects with Builtins and Syscalls' (#33) from kym-builtins into main

Reviewed-on: #33

debug/app.ona

@@ -14,8 +14,8 @@ options = {
 options["foo"] = "rab"
 options[42] = "24"
 
-@log_info(options.title)
+@print(options.title)
-@log_info(options["foo"])
+@print(options["foo"])
-@log_info(options[42])
+@print(options[42])
 
 return options

source/ona/app.zig

@@ -12,8 +12,8 @@ pub const Manifest = struct {
 	height: u16 = 480,
 	tick_rate: f32 = 60.0,
 
-	pub fn load(self: *Manifest, env: *kym.RuntimeEnv, file_access: file.Access) kym.RuntimeError!void {
+	pub fn load(self: *Manifest, env: *kym.RuntimeEnv) kym.RuntimeError!void {
-		const manifest = try env.expect(try env.execute_file(file_access, file.Path.from(&.{"app.ona"})));
+		const manifest = try env.expect(try env.import(file.Path.from(&.{"app.ona"})));
 
 		defer env.discard(manifest);
 

source/ona/file.zig

@@ -3,10 +3,13 @@ const coral = @import("coral");
 const ext = @import("./ext.zig");
 
 pub const Access = union (enum) {
+	null,
     sandboxed_path: *const Path,
 
 	pub fn open_readable(self: Access, readable_path: Path) ?*Readable {
 		switch (self) {
+			.null => return null,
+
 			.sandboxed_path => |sandboxed_path| {
 				const readable_path_string = sandboxed_path.joined(readable_path).to_string() orelse return null;
 
@@ -17,6 +20,8 @@ pub const Access = union (enum) {
 
 	pub fn query(self: Access, path: Path) ?Info {
 		switch (self) {
+			.null => return null,
+
 			.sandboxed_path => |sandboxed_path| {
 				const path_string = sandboxed_path.joined(path).to_string() orelse return null;
 				const rw_ops = ext.SDL_RWFromFile(path_string, "rb") orelse return null;

source/ona/kym.zig

@@ -4,30 +4,14 @@ const coral = @import("coral");
 
 const file = @import("./file.zig");
 
-pub const Caller = coral.io.Generator(RuntimeError!?*RuntimeRef, *RuntimeEnv);
-
-pub const ErrorHandler = coral.io.Generator(void, ErrorInfo);
-
-pub const ErrorInfo = struct {
-	message: []const coral.io.Byte,
-	frames: []const Frame,
-};
-
 pub const Fixed = i32;
 
 pub const Float = f64;
 
-pub const Frame = struct {
-	name: []const coral.io.Byte,
-	arg_count: u8,
-	locals_top: usize,
-};
-
 pub const RuntimeEnv = struct {
+	options: Options,
 	interned_symbols: SymbolSet,
 	allocator: coral.io.Allocator,
-	error_handler: ErrorHandler,
-	system_bindings: RefTable,
 	locals: RefList,
 	frames: FrameStack,
 
@@ -37,6 +21,11 @@ pub const RuntimeEnv = struct {
 		opcodes: OpcodeList,
 		constants: ConstList,
 
+		const Builtin = enum {
+			import,
+			print,
+		};
+
 		const Constant = union (enum) {
 			fixed: Fixed,
 			float: Float,
@@ -51,7 +40,7 @@ pub const RuntimeEnv = struct {
 			push_const: u16,
 			push_local: u8,
 			push_table: u32,
-			push_system: u16,
+			push_builtin: Builtin,
 			local_set: u8,
 			object_get,
 			object_set,
@@ -175,10 +164,18 @@ pub const RuntimeEnv = struct {
 						try self.compile_expression(chunk, grouped_expression.*);
 					},
 
-					.get_system => |get_system| {
+					.builtin => |builtin| {
-						try chunk.opcodes.push_one(.{
+						coral.debug.assert(builtin.len != 0);
-							.push_system = try chunk.declare_constant(.{.symbol = get_system}),
+
+						const decoded_builtin = @as(?Builtin, switch (builtin[0]) {
+							'i' => if (coral.io.ends_with(builtin, "mport")) .import else null,
+							'p' => if (coral.io.ends_with(builtin, "rint")) .print else null,
+							else => null,
 						});
+
+						try chunk.opcodes.push_one(.{.push_builtin = decoded_builtin orelse {
+							return chunk.env.raise(error.BadSyntax, "unknown builtin");
+						}});
 					},
 
 					.local_get => |local_get| {
@@ -360,12 +357,15 @@ pub const RuntimeEnv = struct {
 						try self.env.locals.push_one(table);
 					},
 
-					.push_system => |push_system| {
+					.push_builtin => |push_builtin| {
-						if (self.env.system_bindings.lookup(self.constants.values[push_system])) |syscallable| {
+						const builtin_syscall = try self.env.new_syscall(switch (push_builtin) {
-							try self.env.locals.push_one(try self.env.acquire(syscallable));
+							.import => syscall_import,
-						} else {
+							.print => syscall_print,
-							try self.env.locals.push_one(null);
+						});
-						}
+
+						errdefer self.env.discard(builtin_syscall);
+
+						try self.env.locals.push_one(builtin_syscall);
 					},
 
 					.local_set => |local_set| {
@@ -441,6 +441,8 @@ pub const RuntimeEnv = struct {
 							defer coral.debug.assert(self.env.frames.pop() != null);
 
 							break: call try switch (callable.object().payload) {
+								.syscall => |syscall| syscall(self.env),
+
 								.dynamic => |dynamic| dynamic.typeinfo().call(.{
 									.userdata = dynamic.userdata(),
 									.env = self.env,
@@ -799,7 +801,19 @@ pub const RuntimeEnv = struct {
 
 	const ConstList = coral.list.Stack(*RuntimeRef);
 
-	const FrameStack = coral.list.Stack(Frame);
+	const FrameStack = coral.list.Stack(struct {
+		name: []const coral.io.Byte,
+		arg_count: u8,
+		locals_top: usize,
+	});
+
+	pub const Options = struct {
+		import_access: file.Access = .null,
+		print: ?*const Printer = null,
+		print_error: ?*const Printer = null,
+	};
+
+	pub const Printer = fn (buffer: []const coral.io.Byte) void;
 
 	const RefList = coral.list.Stack(?*RuntimeRef);
 
@@ -916,7 +930,7 @@ pub const RuntimeEnv = struct {
 		return @ptrCast(object);
 	}
 
-	pub fn arg(self: *RuntimeEnv, index: usize) RuntimeError!?*RuntimeRef {
+	pub fn acquire_arg(self: *RuntimeEnv, index: usize) RuntimeError!?*RuntimeRef {
 		const frame = self.frames.peek() orelse return self.raise(error.IllegalState, "stack underflow");
 
 		if (index < frame.arg_count) {
@@ -957,6 +971,8 @@ pub const RuntimeEnv = struct {
 		defer coral.io.assert(self.frames.pop() != null);
 
 		return switch (callable.object().payload) {
+			.syscall => |syscall| syscall(self.env),
+
 			.dynamic => |dynamic| dynamic.typeinfo.call(.{
 				.userdata = dynamic.userdata(),
 				.env = self,
@@ -975,7 +991,7 @@ pub const RuntimeEnv = struct {
 
 		if (object.ref_count == 0) {
 			switch (object.payload) {
-				.false, .true, .float, .fixed, .symbol => {},
+				.false, .true, .float, .fixed, .symbol, .syscall => {},
 
 				.string => |string| {
 					coral.debug.assert(string.len >= 0);
@@ -998,8 +1014,8 @@ pub const RuntimeEnv = struct {
 		}
 	}
 
-	pub fn execute_file(self: *RuntimeEnv, file_access: file.Access, file_path: file.Path) RuntimeError!?*RuntimeRef {
+	pub fn import(self: *RuntimeEnv, file_path: file.Path) RuntimeError!?*RuntimeRef {
-		const file_data = (try file.allocate_and_load(self.allocator, file_access, file_path)) orelse {
+		const file_data = (try file.allocate_and_load(self.allocator, self.options.import_access, file_path)) orelse {
 			return self.raise(error.BadOperation, "failed to open or read file specified");
 		};
 
@@ -1043,18 +1059,8 @@ pub const RuntimeEnv = struct {
 			}
 		}
 
-		{
-			var iterable = self.system_bindings.as_iterable();
-
-			while (iterable.next()) |entry| {
-				self.discard(entry.key);
-				self.discard(entry.value);
-			}
-		}
-
 		self.frames.free();
 		self.locals.free();
-		self.system_bindings.free();
 		self.interned_symbols.free();
 	}
 
@@ -1069,13 +1075,12 @@ pub const RuntimeEnv = struct {
 		};
 	}
 
-	pub fn make(allocator: coral.io.Allocator, error_handler: ErrorHandler) coral.io.AllocationError!RuntimeEnv {
+	pub fn make(allocator: coral.io.Allocator, options: Options) coral.io.AllocationError!RuntimeEnv {
 		return RuntimeEnv{
 			.locals = RefList.make(allocator),
 			.frames = FrameStack.make(allocator),
-			.system_bindings = RefTable.make(allocator, .{}),
 			.interned_symbols = SymbolSet.make(allocator, .{}),
-			.error_handler = error_handler,
+			.options = options,
 			.allocator = allocator,
 		};
 	}
@@ -1158,6 +1163,13 @@ pub const RuntimeEnv = struct {
 		});
 	}
 
+	pub fn new_syscall(self: *RuntimeEnv, value: *const Syscall) RuntimeError!*RuntimeRef {
+		return RuntimeRef.allocate(self.allocator, .{
+			.ref_count = 1,
+			.payload = .{.syscall = value},
+		});
+	}
+
 	pub fn new_table(self: *RuntimeEnv) RuntimeError!*RuntimeRef {
 		var table = Table{
 			.associative = RefTable.make(self.allocator, .{}),
@@ -1178,11 +1190,32 @@ pub const RuntimeEnv = struct {
 		});
 	}
 
+	pub fn print(self: *RuntimeEnv, buffer: []const coral.io.Byte) void {
+		if (self.options.print) |bound_print| {
+			bound_print(buffer);
+		}
+	}
+
+	pub fn print_error(self: *RuntimeEnv, buffer: []const coral.io.Byte) void {
+		if (self.options.print_error) |bound_print_error| {
+			bound_print_error(buffer);
+		}
+	}
+
 	pub fn raise(self: *RuntimeEnv, error_value: RuntimeError, message: []const coral.io.Byte) RuntimeError {
-		self.error_handler.invoke(.{
+		self.print_error(message);
-			.message = message,
+
-			.frames = self.frames.values,
+		if (!self.frames.is_empty()) {
-		});
+			self.print_error("stack trace:");
+
+			var remaining_frames = self.frames.values.len;
+
+			while (remaining_frames != 0) {
+				remaining_frames -= 1;
+
+				self.print_error(self.frames.values[remaining_frames].name);
+			}
+		}
 
 		return error_value;
 	}
@@ -1254,6 +1287,7 @@ pub const RuntimeRef = opaque {
 			float: Float,
 			fixed: Fixed,
 			symbol: [*:0]const coral.io.Byte,
+			syscall: *const Syscall,
 
 			string: struct {
 				ptr: [*]coral.io.Byte,
@@ -1323,6 +1357,11 @@ pub const RuntimeRef = opaque {
 				else => false,
 			},
 
+			.syscall => |self_syscall| switch (other.object().payload) {
+				.syscall => |other_syscall| self_syscall == other_syscall,
+				else => false,
+			},
+
 			.string => |self_string| switch (other.object().payload) {
 				.string => |other_string| coral.io.equals(self_string.unpack(), other_string.unpack()),
 				else => false,
@@ -1344,7 +1383,8 @@ pub const RuntimeRef = opaque {
 			.true => 1231,
 			.float => |float| @bitCast(float),
 			.fixed => |fixed| @intCast(@as(u32, @bitCast(fixed))),
-			.symbol => |symbol| @bitCast(@intFromPtr(symbol)),
+			.symbol => |symbol| @intFromPtr(symbol),
+			.syscall => |syscall| @intFromPtr(syscall),
 			.string => |string| coral.io.djb2_hash(@typeInfo(usize).Int, string.unpack()),
 			.dynamic => |dynamic| @intFromPtr(dynamic.typeinfo()) ^ @intFromPtr(dynamic.userdata().ptr),
 		};
@@ -1364,12 +1404,15 @@ pub const RuntimeRef = opaque {
 			.float => |float| float != 0,
 			.fixed => |fixed| fixed != 0,
 			.symbol => true,
+			.syscall => true,
 			.string => |string| string.len != 0,
 			.dynamic => true,
 		};
 	}
 };
 
+pub const Syscall = fn (env: *RuntimeEnv) RuntimeError!?*RuntimeRef;
+
 pub const Typeinfo = struct {
 	name: []const coral.io.Byte,
 	size: usize,
@@ -1396,14 +1439,6 @@ pub const Typeinfo = struct {
 	}
 };
 
-pub fn bind_syscaller(env: *RuntimeEnv, name: []const coral.io.Byte, caller: Caller) RuntimeError!void {
-	const callable = try new_caller(env, caller);
-
-	defer env.discard(callable);
-
-	try env.bind_system(name, callable);
-}
-
 pub fn get_field(env: *RuntimeEnv, indexable: *RuntimeRef, field: []const coral.io.Byte) RuntimeError!?*RuntimeRef {
 	const field_symbol = try env.new_symbol(field);
 
@@ -1428,18 +1463,20 @@ pub fn get_key(env: *RuntimeEnv, indexable: *RuntimeRef, key: []const coral.io.B
 	return env.get(indexable, key_string);
 }
 
-pub fn new_caller(env: *RuntimeEnv, value: Caller) RuntimeError!*RuntimeRef {
+fn syscall_import(env: *RuntimeEnv) RuntimeError!?*RuntimeRef {
-	const Callable = struct {
+	const arg = try env.expect(try env.acquire_arg(0));
-		fn call(method: Typeinfo.Method) RuntimeError!?*RuntimeRef {
-			coral.debug.assert(method.userdata.len == @sizeOf(Caller));
 
-			return @as(*Caller, @ptrCast(@alignCast(method.userdata))).invoke(method.env);
+	defer env.discard(arg);
-		}
-	};
 
-	return env.new_dynamic(coral.io.bytes_of(&value).ptr, &.{
+	return env.import(file.Path.from(&.{try env.unbox_string(arg)}));
-		.name = "<native>",
+}
-		.size = @sizeOf(Caller),
+
-		.call = Callable.call,
+fn syscall_print(env: *RuntimeEnv) RuntimeError!?*RuntimeRef {
-	});
+	const arg = try env.expect(try env.acquire_arg(0));
+
+	defer env.discard(arg);
+
+	env.print(try env.unbox_string(arg));
+
+	return null;
 }

source/ona/kym/Ast.zig

@@ -13,12 +13,12 @@ pub const Expression = union (enum) {
 	nil_literal,
 	true_literal,
 	false_literal,
+	builtin: []const coral.io.Byte,
 	number_literal: []const coral.io.Byte,
 	string_literal: []const coral.io.Byte,
 	symbol_literal: []const coral.io.Byte,
 	table_literal: TableLiteral,
 	grouped_expression: *Expression,
-	get_system: []const coral.io.Byte,
 	local_get: []const coral.io.Byte,
 	local_set: []const coral.io.Byte,
 
@@ -351,10 +351,10 @@ fn parse_factor(self: *Self) ParseError!Expression {
 				break: parse .{.local_get = identifier};
 			},
 
-			.system_identifier => |system_identifier| {
+			.builtin => |builtin| {
 				self.tokenizer.skip_newlines();
 
-				break: parse .{.get_system = system_identifier};
+				break: parse .{.builtin = builtin};
 			},
 
 			.symbol_brace_left => {

source/ona/kym/tokens.zig

@@ -4,9 +4,8 @@ pub const Token = union(enum) {
 	end,
 	unknown: coral.io.Byte,
 	newline,
-
-	system_identifier: []const coral.io.Byte,
 	identifier: []const coral.io.Byte,
+	builtin: []const coral.io.Byte,
 
 	symbol_plus,
 	symbol_minus,
@@ -46,8 +45,8 @@ pub const Token = union(enum) {
 			.unknown => |unknown| @as([*]const coral.io.Byte, @ptrCast(&unknown))[0 .. 1],
 			.newline => "newline",
 
-			.system_identifier => |identifier| identifier,
 			.identifier => |identifier| identifier,
+			.builtin => |identifier| identifier,
 
 			.symbol_plus => "+",
 			.symbol_minus => "-",
@@ -166,40 +165,52 @@ pub const Tokenizer = struct {
 					coral.debug.assert(identifier.len != 0);
 
 					switch (identifier[0]) {
-						'c' => if (coral.io.ends_with(identifier, "onst")) {
+						'c' => {
+							if (coral.io.ends_with(identifier, "onst")) {
 								self.token = .keyword_const;
 
 								return;
+							}
 						},
 
-						'n' => if (coral.io.ends_with(identifier, "il")) {
+						'n' => {
+							if (coral.io.ends_with(identifier, "il")) {
 								self.token = .keyword_nil;
 
 								return;
+							}
 						},
 
-						'f' => if (coral.io.ends_with(identifier, "alse")) {
+						'f' => {
+							if (coral.io.ends_with(identifier, "alse")) {
 								self.token = .keyword_false;
 
 								return;
+							}
 						},
 
-						't' => if (coral.io.ends_with(identifier, "rue")) {
+						't' => {
+							if (coral.io.ends_with(identifier, "rue")) {
 								self.token = .keyword_true;
 
 								return;
+							}
 						},
 
-						'r' => if (coral.io.ends_with(identifier, "eturn")) {
+						'r' => {
+							if (coral.io.ends_with(identifier, "eturn")) {
 								self.token = .keyword_return;
 
 								return;
+							}
 						},
 
-						's' => if (coral.io.ends_with(identifier, "elf")) {
+						's' => {
+							if (coral.io.ends_with(identifier, "elf")) {
 								self.token = .keyword_self;
 
 								return;
+							}
 						},
 
 						else => {},
@@ -213,44 +224,14 @@ pub const Tokenizer = struct {
 				'@' => {
 					cursor += 1;
 
-					if (cursor < self.source.len) switch (self.source[cursor]) {
-						'A'...'Z', 'a'...'z', '_' => {
 					const begin = cursor;
 
-							cursor += 1;
-
 					while (cursor < self.source.len) switch (self.source[cursor]) {
 						'0'...'9', 'A'...'Z', 'a'...'z', '_' => cursor += 1,
 						else => break,
 					};
 
-							self.token = .{.system_identifier = self.source[begin .. cursor]};
+					self.token = if (begin == cursor) .{.unknown = '@'} else .{.builtin = self.source[begin .. cursor]};
-
-							return;
-						},
-
-						'"' => {
-							cursor += 1;
-
-							const begin = cursor;
-
-							cursor += 1;
-
-							while (cursor < self.source.len) switch (self.source[cursor]) {
-								'"' => break,
-								else => cursor += 1,
-							};
-
-							self.token = .{.system_identifier = self.source[begin .. cursor]};
-							cursor += 1;
-
-							return;
-						},
-
-						else => {},
-					};
-
-					self.token = .symbol_at;
 
 					return;
 				},

source/ona/ona.zig

@@ -10,52 +10,6 @@ const heap = @import("./heap.zig");
 
 const kym = @import("./kym.zig");
 
-fn kym_handle_errors(info: kym.ErrorInfo) void {
-	app.log_fail(info.message);
-
-	var remaining_frames = info.frames.len;
-
-	if (remaining_frames != 0) {
-		app.log_fail("stack trace:");
-
-		while (remaining_frames != 0) {
-			remaining_frames -= 1;
-
-			app.log_fail(info.frames[remaining_frames].name);
-		}
-	}
-}
-
-fn kym_log_info(env: *kym.RuntimeEnv) kym.RuntimeError!?*kym.RuntimeRef {
-	const argument = try env.expect(try env.arg(0));
-
-	defer env.discard(argument);
-
-	app.log_info(try env.unbox_string(argument));
-
-	return null;
-}
-
-fn kym_log_warn(env: *kym.RuntimeEnv) kym.RuntimeError!?*kym.RuntimeRef {
-	const argument = try env.expect(try env.arg(0));
-
-	defer env.discard(argument);
-
-	app.log_warn(try env.unbox_string(argument));
-
-	return null;
-}
-
-fn kym_log_fail(env: *kym.RuntimeEnv) kym.RuntimeError!?*kym.RuntimeRef {
-	const argument = try env.expect(try env.arg(0));
-
-	defer env.discard(argument);
-
-	app.log_fail(try env.unbox_string(argument));
-
-	return null;
-}
-
 fn last_sdl_error() [:0]const u8 {
 	return coral.io.slice_sentineled(@as(u8, 0), @as([*:0]const u8, @ptrCast(ext.SDL_GetError())));
 }
@@ -69,27 +23,19 @@ pub fn run_app(file_access: file.Access) void {
 
 	defer ext.SDL_Quit();
 
-	var script_env = kym.RuntimeEnv.make(heap.allocator, kym.ErrorHandler.from(kym_handle_errors)) catch {
+	var script_env = kym.RuntimeEnv.make(heap.allocator, .{
+		.print = app.log_info,
+		.print_error = app.log_fail,
+		.import_access = file_access,
+	}) catch {
 		return app.log_fail("failed to initialize script runtime");
 	};
 
 	defer script_env.free();
 
-	kym.bind_syscaller(&script_env, "log_info", kym.Caller.from(kym_log_info)) catch {
-		return app.log_fail("failed to bind `log_info` syscall");
-	};
-
-	kym.bind_syscaller(&script_env, "log_warn", kym.Caller.from(kym_log_warn)) catch {
-		return app.log_fail("failed to bind `log_warn` syscall");
-	};
-
-	kym.bind_syscaller(&script_env, "log_fail", kym.Caller.from(kym_log_fail)) catch {
-		return app.log_fail("failed to bind `log_fail` syscall");
-	};
-
 	var manifest = app.Manifest{};
 
-	manifest.load(&script_env, file_access) catch return;
+	manifest.load(&script_env) catch return;
 
 	const window = create: {
 		const pos = ext.SDL_WINDOWPOS_CENTERED;