feat: Support (lightly tested) nested TOML Table Arrays

README.org

@@ -18,7 +18,7 @@ the Emacs core library [[https://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/j
 
 It will then be gradually refactored so that it meets the
 specification defined below.
-* Library Completion Status [5/7]
+* Library Completion Status [6/7]
 - [X] Scalar
   - [X] Boolean
   - [X] Integer
@@ -32,9 +32,9 @@ specification defined below.
 - [X] Tables
   - [X] Basic Tables
   - [X] Nested Tables
-- [-] Array of Tables
+- [X] Array of Tables
   - [X] Basic Array of Tables
-  - [ ] Nested Array of Tables
+  - [X] Nested Array of Tables
 - [ ] Property Lists
 * Specification and Conversion Examples
 [[https://scripter.co/defining-tomelr/][Companion blog post]]
@@ -567,7 +567,8 @@ See [org#Drawers](https://www.gnu.org/software/emacs/manual/html_mono/org.html#D
   ]
 }
 #+end_example
-*** Nested Array of Tables
+*** DONE Nested Array of Tables
+CLOSED: [2022-04-30 Sat 01:32]
 **** S-expression
 #+begin_src emacs-lisp :eval no :noweb-ref nested-table-arrays
 '((fruits . (((name . "apple")
@@ -584,13 +585,14 @@ See [org#Drawers](https://www.gnu.org/software/emacs/manual/html_mono/org.html#D
   <<nested-table-arrays>>)
 #+end_src
 
+#+RESULTS:
 #+begin_src toml
 [[fruits]]
   name = "apple"
-  [fruits.physical]  # subtable
+  [fruits.physical]
     color = "red"
     shape = "round"
-  [[fruits.varieties]]  # nested array of tables
+  [[fruits.varieties]]
     name = "red delicious"
   [[fruits.varieties]]
     name = "granny smith"

test/ttable-array.el

@@ -86,13 +86,13 @@ See [org#Drawers](https://www.gnu.org/software/emacs/manual/html_mono/org.html#D
                ((fruits . (((name . "apple")
                             (varieties . (((name . "red delicious"))
                                           ((name . "granny smith"))))))))
-               ;; ((fruits . (((name . "apple")
-               ;;              (physical . ((color . "red")
-               ;;                           (shape . "round")))
-               ;;              (varieties . (((name . "red delicious"))
-               ;;                            ((name . "granny smith")))))
-               ;;             ((name . "banana")
-               ;;              (varieties . (((name . "plantain"))))))))
+               ((fruits . (((name . "apple")
+                            (physical . ((color . "red")
+                                         (shape . "round")))
+                            (varieties . (((name . "red delicious"))
+                                          ((name . "granny smith")))))
+                           ((name . "banana")
+                            (varieties . (((name . "plantain"))))))))
                ))
         (ref '(
                "[[fruits]]
@@ -106,19 +106,19 @@ See [org#Drawers](https://www.gnu.org/software/emacs/manual/html_mono/org.html#D
     name = \"red delicious\"
   [[fruits.varieties]]
     name = \"granny smith\""
-               ;; "[[fruits]]
-               ;; name = \"apple\"
-               ;; [fruits.physical]
-               ;; color = \"red\"
-               ;; shape = \"round\"
-               ;; [[fruits.varieties]]
-               ;; name = \"red delicious\"
-               ;; [[fruits.varieties]]
-               ;; name = \"granny smith\"
-               ;; [[fruits]]
-               ;; name = \"banana\"
-               ;; [[fruits.varieties]]
-               ;; name = \"plantain\""
+               "[[fruits]]
+  name = \"apple\"
+  [fruits.physical]
+    color = \"red\"
+    shape = \"round\"
+  [[fruits.varieties]]
+    name = \"red delicious\"
+  [[fruits.varieties]]
+    name = \"granny smith\"
+[[fruits]]
+  name = \"banana\"
+  [[fruits.varieties]]
+    name = \"plantain\""
                ))
         out)
     (dolist (el inp)

tomelr.el

@@ -58,9 +58,6 @@ Dictates repetitions of `tomelr-encoding-default-indentation'.")
 This variable is used for both TOML Tables and Arrays of TOML
 Tables.")
 
-(defvar tomelr--print-table-array-key ""
-  "Internal variable used to save the TOML Table Array name.")
-
 (defvar tomelr--print-keyval-separator " = "
   "String used to separate key-value pairs during encoding.")
 
@@ -242,9 +239,7 @@ Return nil if OBJECT cannot be encoded as a TOML string."
      ((equal type 'table)
       (princ (format "[%s]" (string-join tomelr--print-table-hierarchy "."))))
      ((equal type 'table-array)
-      (let ((tta-name (format "[[%s]]" (string-join tomelr--print-table-hierarchy "."))))
-        (setq tomelr--print-table-array-key tta-name)
-        (princ tta-name)))
+      (princ (format "[[%s]]" (string-join tomelr--print-table-hierarchy "."))))
      ((stringp object)
       ;; (message "[tomelr--print-stringlike DBG] %S is string" object)
       (tomelr--print-string sym-name))
@@ -423,6 +418,19 @@ Definition of a TOML Table Array (TTA):
                    nil))))
     ttap))
 
+(defun tomelr--print-tta-key ()
+  "Print TOML Table Array key."
+  ;; (message "[tomelr--print-array DBG] depth = %d" tomelr--print-indentation-depth)
+  ;; Throw away table keys collected at higher depths, if
+  ;; any, from earlier runs of this function.
+  (setq tomelr--print-table-hierarchy
+        (seq-take tomelr--print-table-hierarchy
+                  (1+ tomelr--print-indentation-depth)))
+
+  (tomelr--print-indentation)
+  (insert
+   (format "[[%s]]" (string-join tomelr--print-table-hierarchy "."))))
+
 (defun tomelr--print-array (array)
   "Insert a TOML representation of ARRAY at point.
 See `tomelr-encode-array' that returns the same as a string."
@@ -435,8 +443,7 @@ See `tomelr-encode-array' that returns the same as a string."
         (mapc (lambda (elt)
                 (if first
                     (setq first nil)
-                  (tomelr--print-indentation)
-                  (insert tomelr--print-table-array-key))
+                  (tomelr--print-tta-key))
                 (tomelr--print elt))
               array))))
    (t