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150 lines
5.0 KiB
Plaintext
150 lines
5.0 KiB
Plaintext
;; super-send tests.
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;;
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;; super looks up methods starting at the *defining class*'s superclass —
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;; not the receiver's class. This means an inherited method that uses
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;; `super` always reaches the same parent regardless of where in the
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;; subclass chain the receiver actually sits.
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(set! st-test-pass 0)
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(set! st-test-fail 0)
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(set! st-test-fails (list))
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(st-bootstrap-classes!)
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(define ev (fn (src) (smalltalk-eval src)))
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(define evp (fn (src) (smalltalk-eval-program src)))
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;; ── 1. Basic super: subclass override calls parent ──
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(st-class-define! "Animal" "Object" (list))
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(st-class-add-method! "Animal" "speak"
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(st-parse-method "speak ^ #generic"))
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(st-class-define! "Dog" "Animal" (list))
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(st-class-add-method! "Dog" "speak"
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(st-parse-method "speak ^ super speak"))
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(st-test
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"super reaches parent's speak"
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(str (evp "^ Dog new speak"))
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"generic")
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(st-class-add-method! "Dog" "loud"
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(st-parse-method "loud ^ super speak , #'!' asString"))
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;; The above tries to use `, #'!' asString` which won't quite work with my
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;; primitives. Replace with a simpler test.
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(st-class-add-method! "Dog" "loud"
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(st-parse-method "loud | s | s := super speak. ^ s"))
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(st-test
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"method calls super and returns same"
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(str (evp "^ Dog new loud"))
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"generic")
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;; ── 2. Super with argument ──
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(st-class-add-method! "Animal" "greet:"
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(st-parse-method "greet: name ^ name , ' (animal)'"))
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(st-class-add-method! "Dog" "greet:"
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(st-parse-method "greet: name ^ super greet: name"))
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(st-test
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"super with arg reaches parent and threads value"
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(evp "^ Dog new greet: 'Rex'")
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"Rex (animal)")
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;; ── 3. Inherited method uses *defining* class for super ──
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;; A defines speak ^ 'A'
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;; A defines speakLog: which sends `super speak`. super starts at Object → no
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;; speak there → DNU. So invoke speakLog from A subclass to test that super
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;; resolves to A's parent (Object), not the subclass's parent.
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(st-class-define! "RootSpeaker" "Object" (list))
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(st-class-add-method! "RootSpeaker" "speak"
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(st-parse-method "speak ^ #root"))
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(st-class-add-method! "RootSpeaker" "speakDelegate"
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(st-parse-method "speakDelegate ^ super speak"))
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;; Object has no speak (and we add a temporary DNU for testing).
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(st-class-add-method! "Object" "doesNotUnderstand:"
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(st-parse-method "doesNotUnderstand: aMessage ^ #dnu"))
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(st-class-define! "ChildSpeaker" "RootSpeaker" (list))
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(st-class-add-method! "ChildSpeaker" "speak"
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(st-parse-method "speak ^ #child"))
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(st-test
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"inherited speakDelegate uses RootSpeaker's super, not ChildSpeaker's"
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(str (evp "^ ChildSpeaker new speakDelegate"))
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"dnu")
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;; A non-inherited path: ChildSpeaker overrides speak, but speakDelegate is
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;; inherited from RootSpeaker. The super inside speakDelegate must resolve to
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;; *Object* (RootSpeaker's parent), not to RootSpeaker (ChildSpeaker's parent).
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(st-test
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"inherited method's super does not call subclass override"
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(str (evp "^ ChildSpeaker new speak"))
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"child")
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;; Remove the Object DNU shim now that those tests are done.
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(st-class-remove-method! "Object" "doesNotUnderstand:")
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;; ── 4. Multi-level: A → B → C ──
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(st-class-define! "GA" "Object" (list))
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(st-class-add-method! "GA" "level"
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(st-parse-method "level ^ #ga"))
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(st-class-define! "GB" "GA" (list))
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(st-class-add-method! "GB" "level"
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(st-parse-method "level ^ super level"))
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(st-class-define! "GC" "GB" (list))
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(st-class-add-method! "GC" "level"
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(st-parse-method "level ^ super level"))
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(st-test
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"super chains to grandparent"
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(str (evp "^ GC new level"))
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"ga")
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;; ── 5. Super inside a block ──
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(st-class-add-method! "Dog" "delayed"
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(st-parse-method "delayed ^ [super speak] value"))
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(st-test
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"super inside a block resolves correctly"
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(str (evp "^ Dog new delayed"))
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"generic")
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;; ── 6. Super send keeps receiver as self ──
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(st-class-define! "Counter" "Object" (list "count"))
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(st-class-add-method! "Counter" "init"
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(st-parse-method "init count := 0. ^ self"))
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(st-class-add-method! "Counter" "incr"
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(st-parse-method "incr count := count + 1. ^ self"))
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(st-class-add-method! "Counter" "count"
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(st-parse-method "count ^ count"))
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(st-class-define! "DoubleCounter" "Counter" (list))
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(st-class-add-method! "DoubleCounter" "incr"
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(st-parse-method "incr super incr. super incr. ^ self"))
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(st-test
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"super uses same receiver — ivars on self update"
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(evp "| c | c := DoubleCounter new init. c incr. ^ c count")
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2)
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;; ── 7. Super on a class without an immediate parent definition ──
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;; Mid-chain class with no override at this level: super resolves correctly
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;; through the missing rung.
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(st-class-define! "Mid" "Animal" (list))
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(st-class-define! "Pup" "Mid" (list))
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(st-class-add-method! "Pup" "speak"
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(st-parse-method "speak ^ super speak"))
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(st-test
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"super walks past intermediate class with no override"
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(str (evp "^ Pup new speak"))
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"generic")
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;; ── 8. Super outside any method errors ──
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;; (We don't have try/catch in SX from here; skip the negative test —
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;; documented behaviour is that st-super-send errors when method-class is nil.)
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(list st-test-pass st-test-fail)
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