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-rw-r--r--stdlib/csv.tl98
1 files changed, 98 insertions, 0 deletions
diff --git a/stdlib/csv.tl b/stdlib/csv.tl
new file mode 100644
index 00000000..9b03f3ce
--- /dev/null
+++ b/stdlib/csv.tl
@@ -0,0 +1,98 @@
+;; Copyright 2025
+;; Kaz Kylheku <kaz@kylheku.com>
+;; Vancouver, Canada
+;; All rights reserved.
+;;
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions are met:
+;;
+;; 1. Redistributions of source code must retain the above copyright notice,
+;; this list of conditions and the following disclaimer.
+;;
+;; 2. Redistributions in binary form must reproduce the above copyright notice,
+;; this list of conditions and the following disclaimer in the documentation
+;; and/or other materials provided with the distribution.
+;;
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+;; POSSIBILITY OF SUCH DAMAGE.
+
+(defun get-csv (: (stream *stdin*))
+ (if (stringp stream)
+ (upd stream make-string-input-stream))
+ (enumlet (rfield qfield cr qcr quot)
+ (let ((record (vec))
+ (field (str 0))
+ (state rfield)
+ (done nil))
+ (while (not done)
+ (let ((ch (get-char stream)))
+ (caseql* state
+ (rfield (caseql* ch
+ (#\return (set state cr))
+ (#\newline (vec-push record field)
+ (set done t))
+ (#\, (vec-push record field)
+ (set field (str 0)))
+ (#\" (cond
+ ((empty field)
+ (set state qfield))
+ (t
+ (string-extend field ch))))
+ (nil (vec-push record field)
+ (set done t))
+ (t (string-extend field ch))))
+ (qfield (caseql* ch
+ (#\" (set state quot))
+ (#\return (set state qcr))
+ (nil (vec-push record field)
+ (set done t))
+ (t (string-extend field ch))))
+ (cr (caseql* ch
+ (#\newline (vec-push record field)
+ (set done t))
+ (#\return (string-extend field ch))
+ (#\, (string-extend field #\return)
+ (vec-push record field)
+ (set field (str 0)
+ state rfield))
+ (nil (string-extend field #\return)
+ (vec-push record field)
+ (set done t))
+ (t (string-extend field #\return)
+ (string-extend field ch)
+ (set state rfield))))
+ (qcr (caseql* ch
+ (#\newline (string-extend field ch)
+ (set state qfield))
+ (#\return (string-extend field ch))
+ (nil (string-extend field #\return)
+ (vec-push record field)
+ (set done t))
+ (#\" (string-extend field #\return)
+ (set state quot))
+ (t (string-extend field #\return)
+ (string-extend field ch)
+ (set state qfield))))
+ (quot (caseql* ch
+ (#\, (vec-push record field)
+ (set field (str 0)
+ state rfield))
+ (#\" (string-extend field ch)
+ (set state qfield))
+ (#\newline (vec-push record field)
+ (set done t))
+ (#\return (set state cr))
+ (nil (vec-push record field)
+ (set done t))
+ (t (string-extend field ch)
+ (set state rfield)))))))
+ record)))