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module: components are written in the same style as events

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2024-03-26 13:19:58 -07:00 • committed by Stephen Gutekanst
parent f50a27b83d
commit 7e0b9dde68
10 changed files with 265 additions and 123 deletions
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8
src/ecs/query.zig
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@ -9,23 +9,27 @@ pub const QueryTag = enum {
/// A complex query for entities matching a given criteria
pub fn Query(comptime all_components: anytype) type {
return union(QueryTag) {
// TODO: cleanup comptime
/// Enum matching a namespace. e.g. `.game` or `.physics2d`
pub const Namespace = std.meta.FieldEnum(@TypeOf(all_components));
// TODO: cleanup comptime
/// Enum matching a component within a namespace
/// e.g. `var a: Component(.physics2d) = .location`
pub fn Component(comptime namespace: Namespace) type {
const components = @field(all_components, @tagName(namespace));
if (@typeInfo(components).Struct.decls.len == 0) return enum {};
return std.meta.DeclEnum(components);
if (@typeInfo(@TypeOf(components)).Struct.fields.len == 0) return enum {};
return std.meta.FieldEnum(@TypeOf(components));
}
// TODO: cleanup comptime
/// Slice of enums matching a component within a namespace
/// e.g. `&.{.location, .rotation}`
pub fn ComponentList(comptime namespace: Namespace) type {
return []const Component(namespace);
}
// TODO: cleanup comptime
/// Tagged union of namespaces matching lists of components
/// e.g. `.physics2d = &.{ .location, .rotation }`
pub const NamespaceComponent = T: {