From fb7701869d3b2b561799bd1f160e333eba89da6a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Pant=C5=AF=C4=8Dek?=
 <dominik.pantucek@trustica.cz>
Date: Wed, 22 Mar 2023 10:13:22 +0100
Subject: [PATCH] Row normalization.

---
 table.scm | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/table.scm b/table.scm
index 5b3dc16..8a88112 100644
--- a/table.scm
+++ b/table.scm
@@ -43,10 +43,10 @@
  (define (string->rows str)
    (string-split str "\n" #t))
 
- ;; Creates procedure that ensures a row has given number of elements
+ ;; Creates procedure that ensures a list has given number of elements
  ;; filling the missing elements with given filler (defaults to empty
  ;; string).
- (define ((make-row-extender ds . ofl) row)
+ (define ((make-list-extender ds . ofl) row)
    (let ((fl (if (null? ofl) "" (car ofl))))
      (let ((rs (length row)))
        (if (< rs ds)
@@ -62,7 +62,7 @@
  ;; number of elements using empty strings as filler.
  (define (table-rectangularize tbl)
    (let ((mrl (apply max (map length tbl))))
-     (map (make-row-extender mrl) tbl)))
+     (map (make-list-extender mrl) tbl)))
 
  ;; Accepts list of lists of anything and returns a list of lists of
  ;; strings.
@@ -80,6 +80,12 @@
       (map string->rows r))
     tbl))
 
+ ;; Accepts a list of cells which are list of strings and returns a
+ ;; new list with all cells having the same number of text lines.
+ (define (table-normalize-row row)
+   (let ((ml (apply max (map length row))))
+     (map (make-list-extender ml) row)))
+
  ;; Ensures the table is rectangular and each cell is a list of strings.
  (define (table-prepare tbl)
    (table-prepare-cells
@@ -96,11 +102,11 @@
     (test-equal? string->rows (string->rows "asdf") '("asdf"))
     (test-equal? string->rows (string->rows "asdf\nqwer") '("asdf" "qwer"))
     (test-equal? string->rows (string->rows "\nasdf\nqwer") '("" "asdf" "qwer"))
-    (test-equal? make-row-extender
-		 ((make-row-extender 5) '("test"))
+    (test-equal? make-list-extender
+		 ((make-list-extender 5) '("test"))
 		 '("test" "" "" "" ""))
-    (test-equal? make-row-extender
-		 ((make-row-extender 5 "x") '("test"))
+    (test-equal? make-list-extender
+		 ((make-list-extender 5 "x") '("test"))
 		 '("test" "x" "x" "x" "x"))
     (test-equal? table-rectangularize
 		 (table-rectangularize '(("x" "y" "z") ("a" "b") ("1" "2" "3" "4")))
@@ -111,6 +117,9 @@
     (test-equal? table-prepare-cells
 		 (table-prepare-cells '(("x" "y" "z" "") ("a" "b" "" "") ("1" "2" "3" "4")))
 		 '((("x") ("y") ("z") ("")) (("a") ("b") ("") ("")) (("1") ("2") ("3") ("4"))))
+    (test-equal? table-normalize-row
+		 (table-normalize-row '(("") ("a" "b")))
+		 '(("" "") ("a" "b")))
     ))
 
  )