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module: add GlobalEvent enum

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2024-03-15 18:17:58 -07:00 • committed by Stephen Gutekanst
parent e25281cc64
commit 135e9b8121
1 changed files with 39 additions and 0 deletions
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39
src/module.zig
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@ -295,6 +295,38 @@ fn UninjectedArgsTuple(comptime Function: type, comptime Injectable: type) type
return std.meta.Tuple(std_args);
}
/// enum describing every possible comptime-known global event name
fn GlobalEvent(comptime mods: anytype) type {
var enum_fields: []const std.builtin.Type.EnumField = &[0]std.builtin.Type.EnumField{};
var i: u32 = 0;
for (mods) |M| {
// Global event handlers
for (@typeInfo(M).Struct.decls) |decl| {
switch (@typeInfo(@TypeOf(@field(M, decl.name)))) {
.Fn => {
const exists_already = blk2: {
for (enum_fields) |existing| if (std.mem.eql(u8, existing.name, decl.name)) break :blk2 true;
break :blk2 false;
};
if (!exists_already) {
enum_fields = enum_fields ++ [_]std.builtin.Type.EnumField{.{ .name = decl.name, .value = i }};
i += 1;
}
},
else => {},
}
}
}
return @Type(.{
.Enum = .{
.tag_type = std.math.IntFittingRange(0, enum_fields.len - 1),
.fields = enum_fields,
.decls = &[_]std.builtin.Type.Declaration{},
.is_exhaustive = true,
},
});
}
/// enum describing every possible comptime-known event name
fn EventName(comptime mods: anytype) type {
var enum_fields: []const std.builtin.Type.EnumField = &[0]std.builtin.Type.EnumField{};
@ -571,6 +603,13 @@ test EventName {
try testing.expect([]const u8, "bam").eql(info.fields[3].name);
try testing.expect([]const u8, "tick").eql(info.fields[4].name);
try testing.expect([]const u8, "foobar").eql(info.fields[5].name);
const global_info = @typeInfo(GlobalEvent(Mods.modules)).Enum;
try testing.expect(type, u2).eql(global_info.tag_type);
try testing.expect(usize, 3).eql(global_info.fields.len);
try testing.expect([]const u8, "foo").eql(global_info.fields[0].name);
try testing.expect([]const u8, "bar").eql(global_info.fields[1].name);
try testing.expect([]const u8, "tick").eql(global_info.fields[2].name);
}
test ModuleName {