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Phase 4 cont. go-eval-for handles all three for-header shapes:
for { ... } — infinite (cond defaults to true)
for cond { ... } — while-like (init=nil, post=nil)
for init ; cond ; post { ... } — C-style
Implementation:
* Run INIT (if any), extending env.
* Loop: eval COND. If false, exit with current env.
Eval body (a :block). Catch sentinels:
:return-value → propagate up
:break → exit loop with pre-break env
:continue → still runs POST, then re-loops
Otherwise: run POST, re-loop.
:break and :continue propagate as keyword sentinels through
go-eval-block alongside the existing :return-value sentinel. The
block returns whichever sentinel hit first; control-flow constructs
(for, switch, select) catch them.
inc-dec (x++ / x--) updates env via the same shadowing model used by
assign — `(go-env-extend env name (+ current 1))`.
**Iterative fact(5) = 120 and the classic sum-to-9 = 45 both
evaluate.** Demonstrates the for-loop machinery is solid enough for
real programs.
eval 40/40, total 417/417.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
201 lines
6.6 KiB
Plaintext
201 lines
6.6 KiB
Plaintext
;; Go evaluator tests.
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(define go-eval-test-count 0)
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(define go-eval-test-pass 0)
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(define go-eval-test-fails (list))
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(define
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go-eval-test
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(fn
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(name actual expected)
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(set! go-eval-test-count (+ go-eval-test-count 1))
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(if
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(= actual expected)
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(set! go-eval-test-pass (+ go-eval-test-pass 1))
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(append! go-eval-test-fails {:name name :expected expected :actual actual}))))
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(define gtev (fn (env src) (go-eval env (go-parse src))))
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;; ── env ──────────────────────────────────────────────────────────
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(go-eval-test
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"env: empty lookup returns nil"
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(go-env-lookup go-env-empty "x")
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nil)
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(go-eval-test
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"env: extend then lookup"
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(go-env-lookup (go-env-extend go-env-empty "x" 42) "x")
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42)
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;; ── literals ────────────────────────────────────────────────────
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(go-eval-test "lit: 42 → 42" (gtev go-env-empty "42") 42)
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(go-eval-test "lit: 0 → 0" (gtev go-env-empty "0") 0)
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(go-eval-test "lit: 0xFF → 255" (gtev go-env-empty "0xFF") 255)
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(go-eval-test "lit: 0b1010 → 10" (gtev go-env-empty "0b1010") 10)
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(go-eval-test "lit: 0o17 → 15" (gtev go-env-empty "0o17") 15)
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(go-eval-test
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"lit: underscore separator 1_000 → 1000"
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(gtev go-env-empty "1_000")
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1000)
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(go-eval-test "lit: string" (gtev go-env-empty "\"hello\"") "hello")
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;; ── predeclared ─────────────────────────────────────────────────
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(go-eval-test "var: true" (gtev go-env-empty "true") true)
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(go-eval-test "var: false" (gtev go-env-empty "false") false)
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(go-eval-test "var: nil" (gtev go-env-empty "nil") nil)
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;; ── variable lookup ─────────────────────────────────────────────
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(go-eval-test
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"var: bound x → 5"
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(go-eval (go-env-extend go-env-empty "x" 5) (go-parse "x"))
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5)
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(go-eval-test
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"var: unbound y → :eval-error"
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(gtev go-env-empty "y")
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(list :eval-error :unbound "y"))
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;; ── binary ops ─────────────────────────────────────────────────
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(go-eval-test "binop: 1 + 2 → 3" (gtev go-env-empty "1 + 2") 3)
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(go-eval-test "binop: 10 - 4 → 6" (gtev go-env-empty "10 - 4") 6)
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(go-eval-test "binop: 3 * 7 → 21" (gtev go-env-empty "3 * 7") 21)
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(go-eval-test "binop: 42 / 7 → 6" (gtev go-env-empty "42 / 7") 6)
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(go-eval-test
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"binop: 2 + 3 * 4 → 14 (prec)"
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(gtev go-env-empty "2 + 3 * 4")
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14)
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(go-eval-test
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"binop: a + b uses env"
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(go-eval
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(go-env-extend (go-env-extend go-env-empty "a" 3) "b" 4)
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(go-parse "a + b"))
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7)
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(go-eval-test "binop: 1 < 2 → true" (gtev go-env-empty "1 < 2") true)
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(go-eval-test "binop: 5 == 5 → true" (gtev go-env-empty "5 == 5") true)
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(go-eval-test "binop: 5 != 5 → false" (gtev go-env-empty "5 != 5") false)
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(go-eval-test
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"binop: true && false → false"
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(gtev go-env-empty "true && false")
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false)
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(go-eval-test
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"binop: false || true → true"
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(gtev go-env-empty "false || true")
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true)
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;; ── report ──────────────────────────────────────────────────────
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(go-eval-test
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"var-decl: var x = 5 — env has x=5"
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(go-env-lookup
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(go-eval-program go-env-empty (list (go-parse "var x = 5")))
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"x")
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5)
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(go-eval-test
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"short-decl: a, b := 3, 4 — env has both"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "a, b := 3, 4")))))
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(list (go-env-lookup env "a") (go-env-lookup env "b")))
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(list 3 4))
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(go-eval-test
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"assign: x = 5 then x → 5"
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(let
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((env (go-eval-program (go-env-extend go-env-empty "x" 1) (list (go-parse "x = 5")))))
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(go-env-lookup env "x"))
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5)
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(go-eval-test
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"if: true branch evaluates"
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(let
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((env (go-eval-program (go-env-extend go-env-empty "x" 0) (list (go-parse "if true { x = 1 }")))))
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(go-env-lookup env "x"))
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1)
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(go-eval-test
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"if-else: false → else branch"
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(let
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((env (go-eval-program (go-env-extend go-env-empty "x" 0) (list (go-parse "if false { x = 1 } else { x = 2 }")))))
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(go-env-lookup env "x"))
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2)
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(go-eval-test
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"fn: define + call — double(7) = 14"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "func double(x int) int { return x * 2 }")))))
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(go-eval env (go-parse "double(7)")))
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14)
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(go-eval-test
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"fn: add(2, 3) = 5"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "func add(x, y int) int { return x + y }")))))
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(go-eval env (go-parse "add(2, 3)")))
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5)
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(go-eval-test
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"fn: recursive fib(5) = 5"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "func fib(n int) int { if n < 2 { return n } return fib(n-1) + fib(n-2) }")))))
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(go-eval env (go-parse "fib(5)")))
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5)
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(go-eval-test
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"for: count to 10 with sum"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "var sum = 0") (go-parse "for i := 0; i < 10; i++ { sum = sum + i }")))))
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(go-env-lookup env "sum"))
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45)
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(go-eval-test
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"inc-dec: x++ updates env"
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(let
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((env (go-eval-program (go-env-extend go-env-empty "x" 5) (list (go-parse "x++")))))
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(go-env-lookup env "x"))
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6)
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(go-eval-test
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"inc-dec: x-- updates env"
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(let
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((env (go-eval-program (go-env-extend go-env-empty "x" 5) (list (go-parse "x--")))))
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(go-env-lookup env "x"))
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4)
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(go-eval-test
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"for: break exits the loop"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "var i = 0") (go-parse "for i < 100 { if i == 5 { break } ; i++ }")))))
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(go-env-lookup env "i"))
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5)
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(go-eval-test
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"for: continue skips body but runs post"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "var sum = 0") (go-parse "for i := 0; i < 5; i++ { if i == 2 { continue } ; sum = sum + i }")))))
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(go-env-lookup env "sum"))
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8)
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(go-eval-test
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"for: infinite + break with sum"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "var s = 0") (go-parse "var i = 1") (go-parse "for { if i > 4 { break } ; s = s + i ; i++ }")))))
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(go-env-lookup env "s"))
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10)
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(go-eval-test
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"fn: iterative factorial via for-loop"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "func fact(n int) int { r := 1 ; for i := 2 ; i <= n ; i++ { r = r * i } ; return r }")))))
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(go-eval env (go-parse "fact(5)")))
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120)
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(define
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go-eval-test-summary
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(str "eval " go-eval-test-pass "/" go-eval-test-count))
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