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Phase 4 cont. Adds runtime support for Go's slice type.
Slice representation: (list :go-slice ELEMS) — a simple wrapper around
a list of element values. v0 deferring the full
(length, capacity, backing-vector) triple from the Go spec until
programs need it.
go-eval-composite → for (:composite TYPE-OR-EXPR ELEMS) where
TYPE is :ty-slice / :ty-array, eval each
element (handling :kv index-keyed
shorthand by taking only the value) and
wrap in :go-slice.
go-eval-index → (:index OBJ IDX). Bounds-checked; out-of-
range returns (:eval-error :index-out-of-range).
go-eval-slice → (:slice OBJ LOW HIGH MAX). Two-index slice
with omitted low → 0, omitted high → len.
Returns a new :go-slice.
go-list-slice → primitive list-slicing helper.
Builtins live in a new starter env go-env-builtins:
len(slice|string) → count
append(slice, ...x) → new slice with x appended
print(...) → no-op in v0
Builtins are bound as (:go-builtin NAME); go-eval-call recognises the
shape and routes to go-eval-builtin instead of go-eval-fn.
**Summing a slice via the canonical Go for-loop works end-to-end:**
a := []int{1, 2, 3, 4, 5}
sum := 0
for i := 0; i < len(a); i++ {
sum = sum + a[i]
}
// sum == 15
eval 50/50, total 427/427.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
268 lines
8.5 KiB
Plaintext
268 lines
8.5 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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(go-eval-test
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"slice: []int{1,2,3} → :go-slice"
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(gtev go-env-empty "[]int{1, 2, 3}")
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(list :go-slice (list 1 2 3)))
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(go-eval-test
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"index: a[0] = 10, a[2] = 30"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "a := []int{10, 20, 30}")))))
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(list (go-eval env (go-parse "a[0]")) (go-eval env (go-parse "a[2]"))))
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(list 10 30))
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(go-eval-test
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"index: out-of-range error"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "a := []int{1, 2}")))))
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(go-eval env (go-parse "a[5]")))
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(list :eval-error :index-out-of-range 5 2))
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(go-eval-test
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"builtin: len(slice) = 3"
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(let
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((env (go-eval-program go-env-builtins (list (go-parse "a := []int{1, 2, 3}")))))
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(go-eval env (go-parse "len(a)")))
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3)
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(go-eval-test
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"builtin: len(string)"
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(go-eval go-env-builtins (go-parse "len(\"hello\")"))
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5)
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(go-eval-test
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"builtin: append(a, 4, 5)"
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(let
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((env (go-eval-program go-env-builtins (list (go-parse "a := []int{1, 2, 3}")))))
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(go-eval env (go-parse "append(a, 4, 5)")))
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(list
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:go-slice (list 1 2 3 4 5)))
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(go-eval-test
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"slice expr: a[1:3]"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "a := []int{10, 20, 30, 40}")))))
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(go-eval env (go-parse "a[1:3]")))
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(list :go-slice (list 20 30)))
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(go-eval-test
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"slice expr: a[:2] (omitted low)"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "a := []int{1, 2, 3, 4}")))))
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(go-eval env (go-parse "a[:2]")))
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(list :go-slice (list 1 2)))
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(go-eval-test
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"slice expr: a[2:] (omitted high)"
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(let
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((env (go-eval-program go-env-empty (list (go-parse "a := []int{1, 2, 3, 4}")))))
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(go-eval env (go-parse "a[2:]")))
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(list :go-slice (list 3 4)))
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(go-eval-test
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"fn: sum slice via for-loop with len + index"
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(let
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((env (go-eval-program go-env-builtins (list (go-parse "a := []int{1, 2, 3, 4, 5}") (go-parse "sum := 0") (go-parse "for i := 0; i < len(a); i++ { sum = sum + a[i] }")))))
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(go-env-lookup env "sum"))
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15)
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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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