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Adds the bracket postfix branch:
a[0] / a[i] / a[i+1] / m["key"] → (list :index OBJ IDX)
a[:] / a[1:] / a[:2] / a[1:2] / a[1:2:3] → (list :slice OBJ LOW HIGH MAX)
LOW/HIGH/MAX are AST nodes or nil for omitted indices. The 4th MAX
slot is only populated by the three-index full-slice form.
Two new lib/guest/ast.sx kit gaps surfaced (logged in plans/go-on-sx.md
Blockers):
* No :index node — universal across guests with arrays/maps.
* No :slice node — Python/Rust/Swift/JS/Ruby all need at minimum the
two-index form. Go's three-index variant is more specialised but
fits in the same shape with an optional fourth slot.
Parser is permissive on a[1::3] (strict Go rejects, but the type phase
can enforce the grammar; lexer/parser stays loose).
Chained (a[0][1]) and mixed-with-selector (a[0].field) cases work via
the existing left-associative postfix loop.
parse 61/61, total 190/190.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
320 lines
8.6 KiB
Plaintext
320 lines
8.6 KiB
Plaintext
;; Go parser tests.
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(define go-parse-test-count 0)
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(define go-parse-test-pass 0)
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(define go-parse-test-fails (list))
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(define
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go-parse-test
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(fn
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(name actual expected)
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(set! go-parse-test-count (+ go-parse-test-count 1))
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(if
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(= actual expected)
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(set! go-parse-test-pass (+ go-parse-test-pass 1))
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(append! go-parse-test-fails {:name name :expected expected :actual actual}))))
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;; ── primary: literals ─────────────────────────────────────────────
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(go-parse-test "int literal" (go-parse "42") (ast-literal "42"))
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(go-parse-test "zero literal" (go-parse "0") (ast-literal "0"))
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(go-parse-test "hex literal" (go-parse "0xFF") (ast-literal "0xFF"))
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(go-parse-test "float literal" (go-parse "3.14") (ast-literal "3.14"))
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(go-parse-test "leading-dot float" (go-parse ".5") (ast-literal ".5"))
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(go-parse-test "exponent float" (go-parse "1e10") (ast-literal "1e10"))
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(go-parse-test "imag literal" (go-parse "2i") (ast-literal "2i"))
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(go-parse-test "string literal" (go-parse "\"hi\"") (ast-literal "hi"))
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(go-parse-test "empty string" (go-parse "\"\"") (ast-literal ""))
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(go-parse-test "raw string" (go-parse "`a\nb`") (ast-literal "a\nb"))
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(go-parse-test "rune literal" (go-parse "'a'") (ast-literal "a"))
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;; ── primary: identifiers ──────────────────────────────────────────
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(go-parse-test "ident: simple" (go-parse "x") (ast-var "x"))
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(go-parse-test "ident: underscore" (go-parse "_foo") (ast-var "_foo"))
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(go-parse-test "ident: mixed case" (go-parse "fooBar") (ast-var "fooBar"))
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(go-parse-test "ident: with digit" (go-parse "x123") (ast-var "x123"))
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;; ── primary: non-primary returns nil ──────────────────────────────
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(go-parse-test
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"bin: a + b"
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(go-parse "a + b")
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(ast-app (ast-var "+") (list (ast-var "a") (ast-var "b"))))
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(go-parse-test
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"bin: int + int"
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(go-parse "1 + 2")
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(ast-app (ast-var "+") (list (ast-literal "1") (ast-literal "2"))))
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;; ── report ────────────────────────────────────────────────────────
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(go-parse-test
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"bin: left-assoc a + b + c"
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(go-parse "a + b + c")
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(ast-app
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(ast-var "+")
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(list
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(ast-app (ast-var "+") (list (ast-var "a") (ast-var "b")))
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(ast-var "c"))))
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(go-parse-test
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"bin: * tighter than + → a + b * c"
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(go-parse "a + b * c")
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(ast-app
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(ast-var "+")
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(list
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(ast-var "a")
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(ast-app (ast-var "*") (list (ast-var "b") (ast-var "c"))))))
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(go-parse-test
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"bin: * tighter than + → a * b + c"
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(go-parse "a * b + c")
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(ast-app
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(ast-var "+")
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(list
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(ast-app (ast-var "*") (list (ast-var "a") (ast-var "b")))
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(ast-var "c"))))
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(go-parse-test
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"bin: && tighter than || → a || b && c"
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(go-parse "a || b && c")
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(ast-app
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(ast-var "||")
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(list
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(ast-var "a")
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(ast-app (ast-var "&&") (list (ast-var "b") (ast-var "c"))))))
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(go-parse-test
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"bin: comparison tighter than &&"
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(go-parse "a == b && c < d")
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(ast-app
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(ast-var "&&")
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(list
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(ast-app (ast-var "==") (list (ast-var "a") (ast-var "b")))
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(ast-app (ast-var "<") (list (ast-var "c") (ast-var "d"))))))
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(go-parse-test
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"bin: long left-assoc chain a + b - c + d"
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(go-parse "a + b - c + d")
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(ast-app
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(ast-var "+")
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(list
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(ast-app
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(ast-var "-")
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(list
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(ast-app (ast-var "+") (list (ast-var "a") (ast-var "b")))
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(ast-var "c")))
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(ast-var "d"))))
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(go-parse-test
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"bin: equal-prec left-assoc — a | b ^ c → (a | b) ^ c"
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(go-parse "a | b ^ c")
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(ast-app
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(ast-var "^")
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(list
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(ast-app (ast-var "|") (list (ast-var "a") (ast-var "b")))
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(ast-var "c"))))
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(go-parse-test
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"unary: -a"
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(go-parse "-a")
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(ast-app (ast-var "-") (list (ast-var "a"))))
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(go-parse-test
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"unary: +a"
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(go-parse "+a")
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(ast-app (ast-var "+") (list (ast-var "a"))))
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(go-parse-test
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"unary: !x"
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(go-parse "!x")
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(ast-app (ast-var "!") (list (ast-var "x"))))
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(go-parse-test
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"unary: ^x (bitwise NOT)"
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(go-parse "^x")
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(ast-app (ast-var "^") (list (ast-var "x"))))
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(go-parse-test
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"unary: *p (pointer deref)"
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(go-parse "*p")
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(ast-app (ast-var "*") (list (ast-var "p"))))
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(go-parse-test
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"unary: &v (address-of)"
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(go-parse "&v")
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(ast-app (ast-var "&") (list (ast-var "v"))))
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(go-parse-test
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"unary: <-ch (channel recv)"
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(go-parse "<-ch")
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(ast-app (ast-var "<-") (list (ast-var "ch"))))
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(go-parse-test
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"unary: -1 (on literal)"
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(go-parse "-1")
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(ast-app (ast-var "-") (list (ast-literal "1"))))
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(go-parse-test
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"unary: !!x (chained, right-recursive)"
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(go-parse "!!x")
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(ast-app
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(ast-var "!")
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(list (ast-app (ast-var "!") (list (ast-var "x"))))))
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(go-parse-test
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"unary: -a + b → ((-a) + b) — unary tighter than binary"
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(go-parse "-a + b")
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(ast-app
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(ast-var "+")
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(list (ast-app (ast-var "-") (list (ast-var "a"))) (ast-var "b"))))
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(go-parse-test
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"unary: a + -b → unary applies to RHS"
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(go-parse "a + -b")
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(ast-app
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(ast-var "+")
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(list (ast-var "a") (ast-app (ast-var "-") (list (ast-var "b"))))))
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(go-parse-test
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"call: f() (no args)"
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(go-parse "f()")
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(ast-app (ast-var "f") (list)))
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(go-parse-test
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"call: f(x)"
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(go-parse "f(x)")
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(ast-app (ast-var "f") (list (ast-var "x"))))
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(go-parse-test
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"call: f(x, y, z)"
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(go-parse "f(x, y, z)")
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(ast-app (ast-var "f") (list (ast-var "x") (ast-var "y") (ast-var "z"))))
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(go-parse-test
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"call: f(1, 2)"
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(go-parse "f(1, 2)")
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(ast-app (ast-var "f") (list (ast-literal "1") (ast-literal "2"))))
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(go-parse-test
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"call: f(a + b) — arg can be a binary expr"
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(go-parse "f(a + b)")
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(ast-app
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(ast-var "f")
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(list (ast-app (ast-var "+") (list (ast-var "a") (ast-var "b"))))))
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(go-parse-test
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"call: f(g(x)) — nested"
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(go-parse "f(g(x))")
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(ast-app
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(ast-var "f")
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(list (ast-app (ast-var "g") (list (ast-var "x"))))))
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(go-parse-test
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"select: x.y"
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(go-parse "x.y")
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(list :select (ast-var "x") "y"))
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(go-parse-test
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"select: x.y.z (chained left-assoc)"
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(go-parse "x.y.z")
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(list :select (list :select (ast-var "x") "y") "z"))
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(go-parse-test
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"method: obj.method()"
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(go-parse "obj.method()")
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(ast-app (list :select (ast-var "obj") "method") (list)))
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(go-parse-test
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"method: obj.method(x, y)"
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(go-parse "obj.method(x, y)")
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(ast-app
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(list :select (ast-var "obj") "method")
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(list (ast-var "x") (ast-var "y"))))
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(go-parse-test
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"postfix: -f(x) → unary applies after call"
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(go-parse "-f(x)")
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(ast-app
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(ast-var "-")
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(list (ast-app (ast-var "f") (list (ast-var "x"))))))
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(go-parse-test
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"postfix: f(x) + 1 → call binds tighter than binary +"
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(go-parse "f(x) + 1")
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(ast-app
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(ast-var "+")
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(list (ast-app (ast-var "f") (list (ast-var "x"))) (ast-literal "1"))))
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(go-parse-test
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"index: a[0]"
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(go-parse "a[0]")
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(list :index (ast-var "a") (ast-literal "0")))
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(go-parse-test
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"index: a[i]"
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(go-parse "a[i]")
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(list :index (ast-var "a") (ast-var "i")))
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(go-parse-test
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"index: a[i + 1] (expr index)"
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(go-parse "a[i + 1]")
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(list
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:index (ast-var "a")
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(ast-app (ast-var "+") (list (ast-var "i") (ast-literal "1")))))
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(go-parse-test
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"index: m[\"key\"] (string index)"
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(go-parse "m[\"key\"]")
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(list :index (ast-var "m") (ast-literal "key")))
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(go-parse-test
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"index: a[0][1] (chained)"
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(go-parse "a[0][1]")
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(list
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:index (list :index (ast-var "a") (ast-literal "0"))
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(ast-literal "1")))
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(go-parse-test
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"index: a[0].field (mixed with selector)"
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(go-parse "a[0].field")
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(list :select (list :index (ast-var "a") (ast-literal "0")) "field"))
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(go-parse-test
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"slice: a[:]"
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(go-parse "a[:]")
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(list :slice (ast-var "a") nil nil nil))
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(go-parse-test
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"slice: a[1:]"
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(go-parse "a[1:]")
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(list :slice (ast-var "a") (ast-literal "1") nil nil))
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(go-parse-test
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"slice: a[:2]"
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(go-parse "a[:2]")
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(list :slice (ast-var "a") nil (ast-literal "2") nil))
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(go-parse-test
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"slice: a[1:2]"
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(go-parse "a[1:2]")
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(list :slice (ast-var "a") (ast-literal "1") (ast-literal "2") nil))
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(go-parse-test
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"slice: a[1:2:3] (full slice)"
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(go-parse "a[1:2:3]")
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(list
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:slice (ast-var "a")
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(ast-literal "1")
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(ast-literal "2")
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(ast-literal "3")))
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(go-parse-test
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"slice: a[i:j] (var bounds)"
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(go-parse "a[i:j]")
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(list :slice (ast-var "a") (ast-var "i") (ast-var "j") nil))
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(go-parse-test "non-primary: '+'" (go-parse "+") nil)
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(go-parse-test "non-primary: empty" (go-parse "") nil)
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(define
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go-parse-test-summary
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(str "parse " go-parse-test-pass "/" go-parse-test-count))
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