a68f7c2e64
18 obj-c examples migrated (1308/1311-1317/1319/1320/1321/1341-1347): import
runtime classes '#foreign #objc_class("X") {' → '#objc_class("X") extern {'
(prefix→postfix) + fn/comment '#foreign'→'extern'. No 13xx snapshot asserts on
'foreign' text → all behavior-preserving; empty snapshot diff, corpus-validated.
Per the keep-list policy: KEPT identity-#foreign tests 1306/1318 (filename
ffi-*-foreign*); LEFT comment-only #foreign in the extern/export test files
1332/1348/1349 (no decls). Bare defined #objc_class examples (no #foreign) untouched
— not a purge target. Suite green (647 corpus / 444 unit, 0 failed).
58 lines
2.1 KiB
Plaintext
58 lines
2.1 KiB
Plaintext
// M2.1(a) — class-level constants on a sx-defined `#objc_class`.
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//
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// `name :: Type = expr;` inside the class block is sugar for
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// `name :: () -> Type => expr;` — a niladic class method with an
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// expression body. The compiler emits a C-ABI IMP that returns the
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// captured expression and registers it on the metaclass.
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//
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// Apple's runtime sees no distinction — '[Cls foo]' dispatches to
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// our IMP whether the user wrote it as a constant or as a method.
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// The constant form just reads better for static metadata returns
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// (canonical example: '+layerClass' on UIView subclasses).
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#import "modules/std.sx";
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#import "modules/build.sx";
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#import "modules/ffi/objc.sx";
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NSObject :: #objc_class("NSObject") extern {
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alloc :: () -> *NSObject;
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init :: (self: *NSObject) -> *NSObject;
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}
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// Reframed as a class method internally; user writes the constant form.
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SxThing :: #objc_class("SxThing") {
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counter: i32;
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// Class-level constant.
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answer :: i32 = 42;
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// Canonical pattern: returning a *NSObject (stand-in for Apple's
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// '+layerClass' returning *CALayer).
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seedClass :: *NSObject = NSObject.alloc().init();
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}
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main :: () -> i32 {
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inline if OS == .macos {
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cls : Class = objc_getClass("SxThing".ptr);
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if cls == null { print("FAIL: SxThing not registered\n"); return 1; }
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// [SxThing answer] → 42
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sel_answer : SEL = sel_registerName("answer".ptr);
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msg_int : (cls: *void, sel: *void) -> i32 callconv(.c) = xx objc_msgSend;
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r := msg_int(cls, sel_answer);
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if r != 42 { print("FAIL: answer expected 42, got {}\n", r); return 1; }
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// [SxThing seedClass] returns a non-null NSObject.
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sel_seed : SEL = sel_registerName("seedClass".ptr);
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msg_ptr : (cls: *void, sel: *void) -> *void callconv(.c) = xx objc_msgSend;
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seed := msg_ptr(cls, sel_seed);
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if seed == null { print("FAIL: seedClass returned null\n"); return 1; }
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print("class constants: answer={}, seedClass=ok\n", r);
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}
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inline if OS != .macos {
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print("class constants: answer=42, seedClass=ok\n");
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}
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0
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}
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