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Suppress warnings for register-groups-bind with empty var-list

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If (for some reason) the var-list is empty, there is no code generated
that uses the reg-starts and reg-ends variables, and hence they become
unused.

And without the bindings, the substr-fn is also not necessary.
This commit is contained in:
Jānis Džeriņš
2013-05-23 19:18:58 +03:00
parent df1590a21f
commit 2adedd10d4
1 changed files with 26 additions and 22 deletions
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48
api.lisp
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@ -332,28 +332,32 @@ substrings may share structure with TARGET-STRING."
(with-rebinding (target-string)
(with-unique-names (match-start match-end reg-starts reg-ends
start-index substr-fn)
`(multiple-value-bind (,match-start ,match-end ,reg-starts ,reg-ends)
(scan ,regex ,target-string :start (or ,start 0)
:end (or ,end (length ,target-string)))
(declare (ignore ,match-end))
(when ,match-start
(let* ,(cons
`(,substr-fn (if ,sharedp
#'nsubseq
#'subseq))
(loop for (function var) in (normalize-var-list var-list)
for counter from 0
when var
collect `(,var (let ((,start-index
(aref ,reg-starts ,counter)))
(if ,start-index
(funcall ,function
(funcall ,substr-fn
,target-string
,start-index
(aref ,reg-ends ,counter)))
nil)))))
,@body))))))
(let ((var-bindings
(loop for (function var) in (normalize-var-list var-list)
for counter from 0
when var
collect `(,var (let ((,start-index
(aref ,reg-starts ,counter)))
(if ,start-index
(funcall ,function
(funcall ,substr-fn
,target-string
,start-index
(aref ,reg-ends ,counter)))
nil))))))
`(multiple-value-bind (,match-start ,match-end ,reg-starts ,reg-ends)
(scan ,regex ,target-string :start (or ,start 0)
:end (or ,end (length ,target-string)))
(declare (ignore ,match-end))
,@(unless var-bindings
`((declare (ignore ,reg-starts ,reg-ends))))
(when ,match-start
,@(if var-bindings
`((let* ,(list*
`(,substr-fn (if ,sharedp #'nsubseq #'subseq))
var-bindings)
,@body))
body)))))))
(defmacro do-scans ((match-start match-end reg-starts reg-ends regex
target-string