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Rope from stream #2

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Merged
merged 2 commits into from
Dec 8, 2024
Merged

Rope from stream #2

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99c7040
Make a rope from streams or pathnames
garlic0x1 Dec 8, 2024
ac854c4
remove unused parameter
garlic0x1 Dec 8, 2024
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15 changes: 14 additions & 1 deletion rope.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -36,9 +36,22 @@
;;-------;;

(defgeneric make-rope (source)
(:documentation "Create a new rope from a string.")
(:documentation "Create a new rope from a string, stream, or pathname.")
(:method ((source rope))
source)
(:method ((source stream))
(labels ((read-leaves (&optional acc)
(let* ((string (make-string *long-leaf*))
(length (read-sequence string source))
(leaf (make-instance 'leaf :length length :string (subseq string 0 length))))
(if (= *long-leaf* length)
(read-leaves (cons leaf acc))
(cons leaf acc)))))
(let ((leaves (nreverse (read-leaves))))
(merge-leaves leaves 0 (length leaves)))))
(:method ((source pathname))
(with-open-file (s source)
(make-rope s)))
(:method ((source string))
(let ((length (length source)))
(if (<= *long-leaf* length)
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9 changes: 9 additions & 0 deletions test/basic.lisp
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Expand Up @@ -45,3 +45,12 @@ can be done efficiently.")
(let* ((rope (rope:make-rope "0123456789")))
(is (string= #\1 (rope:index-rope rope 1)))
(is (string= #\9 (rope:index-rope rope 9)))))

(deftest read-files-and-streams ()
"Test reading a file to a rope."
(let* ((pathname (merge-pathnames "README.md" (asdf:system-source-directory :rope)))
(rope (rope:make-rope pathname)))
(is (string= (uiop:read-file-string pathname) (rope:write-rope rope nil))))
(let* ((stream (make-string-input-stream *string-2*))
(rope (rope:make-rope stream)))
(is (string= *string-2* (rope:write-rope rope nil)))))
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