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ecs: improve comptime error messages with empty sets

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2023-03-26 19:43:53 -07:00 • committed by Stephen Gutekanst
parent 4575080ca9
commit 6f499aa418
1 changed files with 30 additions and 19 deletions
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49
libs/ecs/src/systems.zig
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@ -98,6 +98,9 @@ pub fn MessagesTag(comptime messages: anytype) type {
});
}
const NoComponents = @TypeOf(.{});
const NoGlobals = @TypeOf(.{});
/// Returns the namespaced components struct **type**.
//
/// Consult `namespacedComponents` for how a value of this type looks.
@ -114,6 +117,14 @@ fn NamespacedComponents(comptime modules: anytype) type {
.is_comptime = false,
.alignment = @alignOf(@TypeOf(module.components)),
}};
} else {
fields = fields ++ [_]std.builtin.Type.StructField{.{
.name = module_name,
.type = NoComponents,
.default_value = null,
.is_comptime = false,
.alignment = @alignOf(NoComponents),
}};
}
}
return @Type(.{
@ -150,6 +161,8 @@ fn namespacedComponents(comptime modules: anytype) NamespacedComponents(modules)
const module_name = @tagName(@field(module, "name"));
if (@hasDecl(module, "components")) {
@field(x, module_name) = module.components;
} else {
@field(x, module_name) = .{};
}
}
return x;
@ -176,23 +189,21 @@ fn NamespacedGlobals(comptime modules: anytype) type {
const module = @field(modules, module_field.name);
const module_name = @tagName(@field(module, "name"));
const global_fields = std.meta.fields(module);
if (global_fields.len > 0) {
const Globals = @Type(.{
.Struct = .{
.layout = .Auto,
.is_tuple = false,
.fields = global_fields,
.decls = &[_]std.builtin.Type.Declaration{},
},
});
fields = fields ++ [_]std.builtin.Type.StructField{.{
.name = module_name,
.type = Globals,
.default_value = null,
.is_comptime = false,
.alignment = @alignOf(Globals),
}};
}
const Globals = if (global_fields.len > 0) @Type(.{
.Struct = .{
.layout = .Auto,
.is_tuple = false,
.fields = global_fields,
.decls = &[_]std.builtin.Type.Declaration{},
},
}) else NoGlobals;
fields = fields ++ [_]std.builtin.Type.StructField{.{
.name = module_name,
.type = Globals,
.default_value = null,
.is_comptime = false,
.alignment = @alignOf(Globals),
}};
}
return @Type(.{
.Struct = .{
@ -256,8 +267,8 @@ pub fn World(comptime modules: anytype) type {
pub fn send(world: *Self, comptime msg_tag: anytype) !void {
inline for (std.meta.fields(@TypeOf(modules))) |module_field| {
const module = @field(modules, module_field.name);
if (@hasDecl(module, "messages")) {
if (@hasField(module.messages, @tagName(msg_tag))) try module.update(world, msg_tag);
if (@hasDecl(module, "Message")) {
if (@hasField(module.Message, @tagName(msg_tag))) try module.update(world, msg_tag);
}
}
}