* lisp/emacs-lisp/smie.el (smie-forward-token-function)
(smie-backward-token-function): New vars.
(smie-backward-sexp, smie-forward-sexp)
(smie-indent-hanging-p, smie-indent-calculate): Use them.
(smie-default-backward-token): Rename from smie-backward-token and
skip comments.
(smie-default-forward-token): Rename from smie-forward-token and
skip comments.
(smie-next-sexp): Handle nil results from next-token.
(smie-indent-calculate): Add a new case for special `fixindent' comments.
(smie-merge-prec2s): Pass the tables as separate args.
(smie-bnf-precedence-table): Adjust call accordingly.
(smie-prec2-levels): Set levels at the end.
(smie-backward-sexp, smie-forward-sexp): Remove boundary condition now
handled in smie-next-sexp.
(smie-indent-calculate): Provide a starting indentation (so the
recursion is well-founded ;-).
* emacs-lisp/smie.el (smie-prec2-levels): Choose distinct levels even
when it's not needed.
(smie-op-left, smie-op-right): New functions.
(smie-next-sexp): New function, extracted from smie-backward-sexp.
Better handle equal levels to distinguish the associative case from
the "multi-keyword construct" case.
(smie-backward-sexp, smie-forward-sexp): Use it.
* emacs-lisp/smie.el: New file.
* progmodes/prolog.el (prolog-smie-op-levels)
(prolog-smie-indent-rules): New var.
(prolog-mode-variables): Use them to configure SMIE.
(prolog-indent-line, prolog-indent-level): Remove.
