* lisp/ses.el: Miscellaneous cleanups; use lexical-binding; avoid add-to-list.
(ses-localvars): Remove ses--local-printer-list, unused. (ses--metaprogramming): New macro. Use it to defvar variables. (ses-set-localvars): Simplify. (ses--locprn, ses-cell): Use defstruct. Change ses-cell's property-list into an alist. (ses-locprn-get-compiled, ses-locprn-compiled-aset) (ses-locprn-get-def, ses-locprn-def-aset, ses-locprn-get-number): Remove; use defstruct accessors/setters instead. (ses-cell-formula-aset, ses-cell-printer-aset) (ses-cell-references-aset): Remove, use setf instead. (ses--alist-get): New function. (ses-cell-property): Rename from ses-cell-property-get and rewrite. Use an alist instead of a plist and don't do move-to-front since the list is always short. (ses-cell-property-get-fun, ses-cell-property-delq-fun) (ses-cell-property-set-fun, ses-cell-property-set) (ses-cell-property-pop-fun, ses-cell-property-get-handle) (ses-cell-property-handle-car, ses-cell-property-handle-setcar): Remove. (ses--letref): New macro. (ses-cell-property-pop): Rewrite. (ses--cell): Rename from ses-cell and make it into a function. Make `formula' fallback on `value' if nil. (ses--local-printer): Rename from ses-local-printer and make it into a function. (ses-set-cell): Turn it into a macro so finding the accessor from the field name is done at compile time. (ses-repair-cell-reference-all): Test presence of `sym' rather than `ref' before adding `sym' to :ses-repair-reference. (ses-calculate-cell): Use ses--letref rather than ses-cell-property-get-handle. (ses-write-cells): Use a single prin1-to-string. (ses-setter-with-undo): New function. (ses-aset-with-undo, ses-set-with-undo): Rewrite using it. (ses-unset-with-undo): Remove. (ses-load): Prefer apply' over `eval'. (ses-read-printer, ses-set-column-width): Use standard "(default foo)" format.
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