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Test syntax-path error branches #823

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Merged
jackfirth merged 1 commit into from
Jul 14, 2026
Merged

Test syntax-path error branches #823

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44 changes: 44 additions & 0 deletions grimoire/syntax-path.rkt
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Original file line number Diff line number Diff line change
Expand Up @@ -214,6 +214,18 @@
(check-equal? (syntax-path-remove-prefix path prefix) expected))))


(module+ test
(test-case "syntax-path-remove-prefix errors"

(test-case "path shorter than prefix"
(check-exn #rx"path is shorter than prefix"
(λ () (syntax-path-remove-prefix (syntax-path (list 1)) (syntax-path (list 1 2 3))))))

(test-case "path does not start with prefix"
(check-exn #rx"path does not start with given prefix"
(λ () (syntax-path-remove-prefix (syntax-path (list 1 2 3)) (syntax-path (list 9))))))))


(define (syntax-path-last-element path)
(treelist-last (syntax-path-elements path)))

Expand Down Expand Up @@ -592,6 +604,30 @@
(check-regexp-match #rx"path is inconsistent" (exn-message thrown)))))


(module+ test
(test-case "syntax-ref errors"

(test-case "vector index out of bounds"
(check-exn #rx"path is inconsistent"
(λ () (syntax-ref #'#[a b c] (syntax-path (list 5))))))

(test-case "box index out of bounds"
(check-exn #rx"path is inconsistent"
(λ () (syntax-ref #'#&a (syntax-path (list 1))))))

(test-case "prefab field index out of bounds"
(check-exn #rx"path is inconsistent"
(λ () (syntax-ref #'#s(point 10 20) (syntax-path (list 5))))))

(test-case "improper list index out of bounds"
(check-exn #rx"path is inconsistent"
(λ () (syntax-ref #'(a b . c) (syntax-path (list 5))))))

(test-case "path into non-compound datum"
(check-exn #rx"path is inconsistent"
(λ () (syntax-ref #'(a b c) (syntax-path (list 0 0))))))))


(define (syntax-contains-path? init-stx path)
(let/ec return
(for/fold ([stx init-stx])
Expand Down Expand Up @@ -876,6 +912,14 @@
(check-equal? (syntax->datum actual) '(a b c FOO e)))))


(module+ test
(test-case "syntax-set errors"

(test-case "path into non-compound datum"
(check-exn #rx"path is inconsistent"
(λ () (syntax-set #'(a b c) (syntax-path (list 0 0)) #'FOO))))))


(define/guard (syntax-remove-splice stx path children-count)
(unless (syntax-contains-path? stx path)
(raise-arguments-error 'syntax-remove-splice
Expand Down
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