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(define *annotation-escape* '())
(define (parse-annotations)
(let ((save-layout (dynamic *layout-stack*)))
(setf (dynamic *layout-stack*) '())
(advance-token)
(let/cc annotation-escape
(setf *annotation-escape* (lambda ()
(setf (dynamic *layout-stack*) save-layout)
(advance-to-annotation-end)
(funcall annotation-escape '())))
(let ((res (start-layout (function parse-annotation-list-1))))
(setf (dynamic *layout-stack*) save-layout)
(token-case
(end-annotation res)
(else (signal-annotation-error)))))))
(define (parse-annotation-list-1 in-layout?)
(let ((kind (get-annotation-kind)))
(cond ((eq? kind 'decl)
(let ((d (parse-annotation-decl)))
(token-case
(\; (cons d (parse-annotation-list-1 in-layout?)))
(else (close-layout in-layout?)
(list d)))))
((eq? kind 'value)
(let ((d (parse-annotation-value)))
(token-case
(\; (cons d (parse-annotation-list-1 in-layout?)))
(else (close-layout in-layout?)
(list d)))))
(else
(close-layout in-layout?)
'()))))
(define (get-annotation-kind)
(token-case
((no-advance end-annotation) 'end)
((no-advance \() 'decl)
((var con)
(let ((next (peek-1-type)))
(cond ((eq? next '|,|)
'decl)
((eq? next '|::|)
'decl)
(else
'value))))
(else 'error)))
(define (parse-annotation-decl)
(let* ((names (parse-aname-list))
(decls (parse-aval-list)))
(make annotation-decl (names names) (annotations decls))))
(define (parse-aname-list)
(let ((name 'foo))
(token-case
(var
(setf name (var->symbol)))
(con
(setf name (con->symbol)))
(else (signal-annotation-error)))
(token-case (\, (cons name (parse-aname-list)))
(|::| (list name))
(else (signal-annotation-error)))))
(define (parse-aval-list)
(let ((ann (parse-annotation-value)))
(token-case (\, (cons ann (parse-aval-list)))
(else (list ann)))))
(define (parse-annotation-value)
(token-case
(name (let* ((name (token->symbol))
(args (parse-annotation-args name)))
(make annotation-value (name name) (args args))))))
(define (parse-annotation-args name)
(token-case
(\( (parse-annotation-args-1 name 0))
(else '())))
;;; This routine can invoke special parsers for the arguments
(define (parse-annotation-args-1 name i)
(let* ((argtype (get-annotation-arg-description name i))
(arg (parse-annotation-arg argtype)))
(token-case
(\) (list arg))
(\, (cons arg (parse-annotation-args-1 name (1+ i))))
(else (signal-annotation-error)))))
(define (parse-annotation-arg type)
(cond ((eq? type 'string)
(token-case
((string no-advance)
(let ((res (car *token-args*)))
(advance-token)
res))
(else (signal-annotation-error))))
;; The following is for a datatype import/export. It is
;; Type(Con1(strs),Con2(strs),...)
((eq? type 'integer)
(token-case
((integer no-advance) (token->integer))
(else (signal-annotation-error))))
((eq? type 'constr-list)
(parse-annotation-constr-list))
(else
(signal-annotation-error))))
(define (signal-annotation-error)
(parser-error/recoverable 'annotation-error "Error in annotation syntax")
(funcall *annotation-escape*))
(define (parse-annotation-constr-list)
(token-case
(tycon (let ((type-name (token->symbol)))
(token-case (\( (let* ((args (parse-acl1))
(res (tuple type-name args)))
(token-case ; leave the ) to end the args
((no-advance \)) (list res))
(\, (cons res (parse-annotation-constr-list)))
(else (signal-annotation-error)))))
(else (signal-annotation-error)))))
(else (signal-annotation-error))))
(define (parse-acl1)
(token-case
(con (let ((con-name (con->symbol)))
(token-case (\( (let ((str-args (parse-string-list)))
(token-case
(\, (cons (tuple con-name str-args)
(parse-acl1)))
(\) (list (tuple con-name str-args)))
(else (signal-annotation-error)))))
(else (signal-annotation-error)))))
(else (signal-annotation-error))))
(define (parse-string-list)
(token-case
((string no-advance)
(let ((res (read-lisp-object (car *token-args*))))
(advance-token)
(token-case
(\) (list res))
(\, (cons res (parse-string-list)))
(else (signal-annotation-error)))))
(else (signal-annotation-error))))
(define (advance-to-annotation-end)
(token-case
(eof '())
(end-annotation
(advance-token))
(else
(advance-token)
(advance-to-annotation-end))))
(define *known-annotations* '(
(|LispName| string)
(|Prelude|)
(|Strictness| string)
(|Strict|)
(|NoConversion|)
(|Inline|)
(|STRICT|)
(|ImportLispType| constr-list)
(|ExportLispType| constr-list)
(|Complexity| integer)
))
(define (get-annotation-arg-description annotation i)
(let ((s (assq annotation *known-annotations*)))
(cond ((eq? s '#f)
(parser-error/recoverable 'unknown-annotation
"Annotation ~A is not defined in this system - ignored."
annotation)
'unknown)
((>= i (length s))
'error)
(else (list-ref s (1+ i))))))
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