improve error reporting in `validate-txexpr`

dev-fixit
Matthew Butterick 9 years ago
parent 4264ee9856
commit c253856d69

@ -140,7 +140,12 @@
[(txexpr? x) (and
(validate-txexpr-attrs-with-context (get-attrs x))
(andmap (λ(e) (validate-txexpr-element-with-context e)) (get-elements x)) x)]
[else (error 'validate-txexpr (format "~v is not a list starting with a symbol" x))]))
[(and (list? x) (symbol? (car x)))
(and
(validate-txexpr-attrs-with-context (get-attrs x))
(andmap (λ(e) (validate-txexpr-element-with-context e)) (get-elements x)) x)]
[(list? x) (error 'validate-txexpr (format "~v is a list but it doesn't start with a symbol" x))]
[else (error 'validate-txexpr (format "~v: not an X-expression" x))]))
(define+provide+safe (txexpr tag [attrs null] [elements null])

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