问题描述
在解读 SBCL 编译器消息时遇到问题:
; in: DEFUN PURIFY-FILE
; (DEFUN DEPENDENCIES::PURIFY-FILE (DEPENDENCIES::FILE)
; "Transforms problematic symbols to benign NIL in file,before reading.
; Returns a string of altered file content."
; (LET ((DEPENDENCIES::FILE-STRING
; (ALEXANDRIA:READ-FILE-INTO-STRING DEPENDENCIES::FILE))
; (DEPENDENCIES::MODIFIED-FILE-STRING ""))
; (SETF DEPENDENCIES::MODIFIED-FILE-STRING
; (CL-PPCRE:REGEX-REPLACE-ALL "[ trn]'[A-Za-z0-9!@$%&*_+:=<.>/?-]+"
; DEPENDENCIES::FILE-STRING " NIL"))
; (CL-PPCRE:REGEX-REPLACE-ALL
; "[(][qQ][uU][oO][tT][eE][ trn]+[A-Za-z0-9!@$%&*_+:=<.>/?-]+[)]"
; DEPENDENCIES::MODIFIED-FILE-STRING "NIL")))
; --> PROGN SB-IMPL::%DEFUN SB-IMPL::%DEFUN SB-INT:NAMED-LAMBDA
; ==>
; #'(SB-INT:NAMED-LAMBDA DEPENDENCIES::PURIFY-FILE
; (DEPENDENCIES::FILE)
; (DECLARE (SB-C::TOP-LEVEL-FORM))
; "Transforms problematic symbols to benign NIL in file,before reading.
; Returns a string of altered file content."
; (BLOCK DEPENDENCIES::PURIFY-FILE
; (LET ((DEPENDENCIES::FILE-STRING #)
; (DEPENDENCIES::MODIFIED-FILE-STRING ""))
; (SETF DEPENDENCIES::MODIFIED-FILE-STRING #)
; (CL-PPCRE:REGEX-REPLACE-ALL
; "[(][qQ][uU][oO][tT][eE][ trn]+[A-Za-z0-9!@$%&*_+:=<.>/?-]+[)]"
; DEPENDENCIES::MODIFIED-FILE-STRING "NIL"))))
;
; note: type assertion too complex to check:
; (VALUES STRING &OPTIONAL BOOLEAN &REST T).
我对这个函数的规范是
(declaim (ftype (function (pathname) (values string (member NIL T))) purify-file))
是关于 CL-PPCRE:REGEX-REPLACE-ALL
返回多个值吗?如果是这样,您如何使用 ftype
来指定所有多个值的类型——在这种情况下是 string & NIL 或 T?谢谢。
解决方法
确实,正如消息所示,类型规范 (values string (member NIL T))
对于 SBCL 来说太复杂了。将 typespec 更改为 (values t t)
有效。