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module: improve isString, add tests

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2024-03-27 06:14:53 -07:00 • committed by Stephen Gutekanst
parent 0328598945
commit ea14480246
1 changed files with 24 additions and 6 deletions
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30
src/module.zig
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@ -817,8 +817,7 @@ fn MComponents(comptime M: anytype) type {
fn NamespacedState(comptime modules: anytype) type {
var fields: []const std.builtin.Type.StructField = &[0]std.builtin.Type.StructField{};
inline for (modules) |M| {
// TODO: can't verify module here because it would introduce a dependency loop
// _ = ModuleInterface(M);
_ = ModuleInterface(M); // Validate the module
const state_fields = std.meta.fields(M);
const State = if (state_fields.len > 0) @Type(.{
.Struct = .{
@ -846,18 +845,37 @@ fn NamespacedState(comptime modules: anytype) type {
});
}
// TODO: tests
// TODO: stricter enforcement
fn isString(comptime S: type) bool {
return switch (@typeInfo(S)) {
.Pointer => |p| switch (@typeInfo(p.child)) {
.Array => |a| a.child == u8,
.Pointer => |p| switch (p.size) {
.Many, .Slice => p.child == u8,
.One => switch (@typeInfo(p.child)) {
.Array => |a| a.child == u8,
else => false,
},
else => false,
},
else => false,
};
}
test isString {
const x: [*:0]const u8 = "foobar";
const y: []const u8 = "foobar";
const z: *const [6:0]u8 = "foobar";
try testing.expect(bool, true).eql(isString(@TypeOf(x)));
try testing.expect(bool, true).eql(isString(@TypeOf(y)));
try testing.expect(bool, true).eql(isString(@TypeOf(z)));
try testing.expect(bool, true).eql(isString(@TypeOf("baz")));
const v0: []const u32 = undefined;
const v1: u32 = undefined;
const v2: *u8 = undefined;
try testing.expect(bool, false).eql(isString(@TypeOf(v0)));
try testing.expect(bool, false).eql(isString(@TypeOf(v1)));
try testing.expect(bool, false).eql(isString(@TypeOf(v2)));
}
test {
testing.refAllDeclsRecursive(@This());
}