-;;;; simple string transforms
-
-(deftransform subseq ((string start &optional (end nil))
- (simple-string t &optional t))
- `(let* ((length (- (or end (length string))
- start))
- (result (make-string length)))
- (declare (optimize (safety 0)))
- (bit-bash-copy string
- (the index
- (+ (the index (* start sb!vm:byte-bits))
- ,vector-data-bit-offset))
- result
- ,vector-data-bit-offset
- (the index (* length sb!vm:byte-bits)))
- result))
-
-(deftransform copy-seq ((seq) (simple-string))
- `(let* ((length (length seq))
- (res (make-string length)))
- (declare (optimize (safety 0)))
- (bit-bash-copy seq
- ,vector-data-bit-offset
- res
- ,vector-data-bit-offset
- (the index (* length sb!vm:byte-bits)))
- res))
-
-(deftransform replace ((string1 string2 &key (start1 0) (start2 0)
- end1 end2)
- (simple-string simple-string &rest t))
- `(locally (declare (optimize (safety 0)))
- (bit-bash-copy string2
- (the index
- (+ (the index (* start2 sb!vm:byte-bits))
- ,vector-data-bit-offset))
- string1
- (the index
- (+ (the index (* start1 sb!vm:byte-bits))
- ,vector-data-bit-offset))
- (the index
- (* (min (the index (- (or end1 (length string1))
- start1))
- (the index (- (or end2 (length string2))
- start2)))
- sb!vm:byte-bits)))
- string1))
-
-(deftransform concatenate ((rtype &rest sequences)
- (t &rest simple-string)
- simple-string)
- (collect ((lets)
- (forms)
- (all-lengths)
- (args))
- (dolist (seq sequences)
- (declare (ignore seq))
- (let ((n-seq (gensym))
- (n-length (gensym)))
- (args n-seq)
- (lets `(,n-length (the index (* (length ,n-seq) sb!vm:byte-bits))))
- (all-lengths n-length)
- (forms `(bit-bash-copy ,n-seq ,vector-data-bit-offset
- res start
- ,n-length))
- (forms `(setq start (+ start ,n-length)))))
- `(lambda (rtype ,@(args))
- (declare (ignore rtype))
- (let* (,@(lets)
- (res (make-string (truncate (the index (+ ,@(all-lengths)))
- sb!vm:byte-bits)))
- (start ,vector-data-bit-offset))
- (declare (type index start ,@(all-lengths)))
- ,@(forms)
- res))))
-\f