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go: parse.sx — func type expressions (anonymous params) + 9 tests [nothing]
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Adds Go func-type parsing to gp-parse-type:
  func()                  →  (list :ty-func () ())
  func() int              →  (list :ty-func () [int])
  func(int, string)       →  (list :ty-func [int string] ())
  func(int) string        →  (list :ty-func [int] [string])
  func() (int, error)     →  (list :ty-func () [int error])

gp-parse-func-type-params handles the param list inside (...);
gp-parse-func-type-results dispatches between bare single-return,
multi-return parenthesised list, or no return.

Anonymous-only — named params (`func(a int, b string)`) require a
different shape and are mainly needed for func DECLARATIONS, not for
pure func-type expressions in type position. Variadic ('...T')
deferred.

Covers nested cases: func returning func, chan of func, func with
pointer/slice operands.

parse 90/90, total 219/219.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-05-27 08:06:53 +00:00
parent 8ba66e0dc9
commit 9acdbcb8d8
5 changed files with 147 additions and 8 deletions
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71
lib/go/tests/parse.sx
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@@ -436,6 +436,77 @@
:assert (ast-var "v")
(list :ty-ptr (list :ty-slice (list :ty-name "int")))))
(go-parse-test
"ty: func() (no params, no return)"
(go-parse "v.(func())")
(list :assert (ast-var "v") (list :ty-func (list) (list))))
(go-parse-test
"ty: func() int (no params, one return)"
(go-parse "v.(func() int)")
(list
:assert (ast-var "v")
(list :ty-func (list) (list (list :ty-name "int")))))
(go-parse-test
"ty: func(int)"
(go-parse "v.(func(int))")
(list
:assert (ast-var "v")
(list :ty-func (list (list :ty-name "int")) (list))))
(go-parse-test
"ty: func(int, string)"
(go-parse "v.(func(int, string))")
(list
:assert (ast-var "v")
(list
:ty-func (list (list :ty-name "int") (list :ty-name "string"))
(list))))
(go-parse-test
"ty: func(int) string"
(go-parse "v.(func(int) string)")
(list
:assert (ast-var "v")
(list
:ty-func (list (list :ty-name "int"))
(list (list :ty-name "string")))))
(go-parse-test
"ty: func() (int, error) (multi return)"
(go-parse "v.(func() (int, error))")
(list
:assert (ast-var "v")
(list
:ty-func (list)
(list (list :ty-name "int") (list :ty-name "error")))))
(go-parse-test
"ty: func(*T) []int (pointer param, slice return)"
(go-parse "v.(func(*T) []int)")
(list
:assert (ast-var "v")
(list
:ty-func (list (list :ty-ptr (list :ty-name "T")))
(list (list :ty-slice (list :ty-name "int"))))))
(go-parse-test
"ty: func() func() (nested func type as return)"
(go-parse "v.(func() func())")
(list
:assert (ast-var "v")
(list :ty-func (list) (list (list :ty-func (list) (list))))))
(go-parse-test
"ty: chan func() int (chan of func type)"
(go-parse "v.(chan func() int)")
(list
:assert (ast-var "v")
(list
:ty-chan :both
(list :ty-func (list) (list (list :ty-name "int"))))))
(go-parse-test "non-primary: '+'" (go-parse "+") nil)
(go-parse-test "non-primary: empty" (go-parse "") nil)