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;;; sml-move.el
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(defconst rcsid-sml-move "@(#)$Name$:$Id$")
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;; Copyright (C) 1999-1999 Stefan Monnier <monnier@cs.yale.edu>
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;;
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software
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;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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(require 'cl)
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(require 'sml-util)
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(require 'sml-defs)
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;;
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(defsyntax sml-internal-syntax-table
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'((?_ . "w")
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(?' . "w")
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(?. . "w")
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;; treating `~' as a word constituent is not quite right, but
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;; close enough. Think about 12.3E~2 for example. Also `~' on its
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;; own *is* a nonfix symbol.
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(?~ . "w"))
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"Syntax table used for internal sml-mode operation."
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:copy sml-mode-syntax-table)
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;;;
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;;; various macros
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;;;
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(defmacro sml-with-ist (&rest r)
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(let ((ost-sym (make-symbol "oldtable")))
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`(let ((,ost-sym (syntax-table))
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(case-fold-search nil)
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(parse-sexp-lookup-properties t)
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(parse-sexp-ignore-comments t))
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(unwind-protect
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(progn (set-syntax-table sml-internal-syntax-table) . ,r)
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(set-syntax-table ,ost-sym)))))
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(def-edebug-spec sml-with-ist t)
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(defmacro sml-move-if (&rest body)
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(let ((pt-sym (make-symbol "point"))
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(res-sym (make-symbol "result")))
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`(let ((,pt-sym (point))
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(,res-sym ,(cons 'progn body)))
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(unless ,res-sym (goto-char ,pt-sym))
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,res-sym)))
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(def-edebug-spec sml-move-if t)
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(defmacro sml-point-after (&rest body)
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`(save-excursion
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| 64 : |
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,@body
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(point)))
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(def-edebug-spec sml-point-after t)
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;;
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(defvar sml-op-prec
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(sml-preproc-alist
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'(("before" . 0)
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((":=" "o") . 3)
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((">" ">=" "<>" "<" "<=" "=") . 4)
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(("::" "@") . 5)
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(("+" "-" "^") . 6)
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(("/" "*" "quot" "rem" "div" "mod") . 7)))
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"Alist of SML infix operators and their precedence.")
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(defconst sml-syntax-prec
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(sml-preproc-alist
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`(((";" "," "in" "with") . 10)
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(("=>" "d=" "=of") . (65 . 40))
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("|" . (47 . 30))
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(("case" "of" "fn") . 45)
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(("if" "then" "else" "while" "do" "raise") . 50)
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("handle" . 60)
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("orelse" . 70)
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("andalso" . 80)
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((":" ":>") . 90)
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("->" . 95)
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(,(cons "end" sml-begin-syms) . 10000)))
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"Alist of pseudo-precedence of syntactic elements.")
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(defun sml-op-prec (op dir)
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"return the precedence of OP or nil if it's not an infix.
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DIR should be set to BACK if you want to precedence w.r.t the left side
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and to FORW for the precedence w.r.t the right side.
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This assumes that we are looking-at the OP."
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(when op
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(let ((sprec (cdr (assoc op sml-syntax-prec))))
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| 102 : |
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(cond
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((consp sprec) (if (eq dir 'back) (car sprec) (cdr sprec)))
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(sprec sprec)
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(t
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(let ((prec (cdr (assoc op sml-op-prec))))
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(when prec (+ prec 100))))))))
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;;
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(defun sml-forward-spaces () (forward-comment 100000))
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(defun sml-backward-spaces () (forward-comment -100000))
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;;
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| 116 : |
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;; moving forward around matching symbols
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;;
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(defun sml-looking-back-at (re)
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| 120 : |
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(save-excursion
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| 121 : |
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(when (= 0 (skip-syntax-backward "w_")) (backward-char))
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| 122 : |
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(looking-at re)))
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| 123 : |
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| 124 : |
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(defun sml-find-match-forward (this match)
|
| 125 : |
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"Only works for word matches"
|
| 126 : |
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(let ((level 1)
|
| 127 : |
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(either (concat this "\\|" match)))
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| 128 : |
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(while (> level 0)
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| 129 : |
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(forward-sexp 1)
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| 130 : |
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(while (not (or (eobp) (sml-looking-back-at either)))
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| 131 : |
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(condition-case () (forward-sexp 1) (error (forward-char 1))))
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| 132 : |
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(setq level
|
| 133 : |
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(cond
|
| 134 : |
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((sml-looking-back-at this) (1+ level))
|
| 135 : |
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((sml-looking-back-at match) (1- level))
|
| 136 : |
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(t (error "Unbalanced")))))
|
| 137 : |
|
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t))
|
| 138 : |
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|
| 139 : |
|
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(defun sml-find-match-backward (this match)
|
| 140 : |
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(let ((level 1)
|
| 141 : |
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(either (concat this "\\|" match)))
|
| 142 : |
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(while (> level 0)
|
| 143 : |
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(backward-sexp 1)
|
| 144 : |
|
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(while (not (or (bobp) (looking-at either)))
|
| 145 : |
|
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(condition-case () (backward-sexp 1) (error (backward-char 1))))
|
| 146 : |
|
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(setq level
|
| 147 : |
|
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(cond
|
| 148 : |
|
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((looking-at this) (1+ level))
|
| 149 : |
|
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((looking-at match) (1- level))
|
| 150 : |
|
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(t (error "Unbalanced")))))
|
| 151 : |
|
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t))
|
| 152 : |
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|
| 153 : |
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;;;
|
| 154 : |
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;;; read a symbol, including the special "op <sym>" case
|
| 155 : |
|
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;;;
|
| 156 : |
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|
| 157 : |
|
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(defmacro sml-move-read (&rest body)
|
| 158 : |
|
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(let ((pt-sym (make-symbol "point")))
|
| 159 : |
|
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`(let ((,pt-sym (point)))
|
| 160 : |
|
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,@body
|
| 161 : |
|
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(when (/= (point) ,pt-sym)
|
| 162 : |
|
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(buffer-substring (point) ,pt-sym)))))
|
| 163 : |
|
|
(def-edebug-spec sml-move-read t)
|
| 164 : |
|
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|
| 165 : |
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(defun sml-poly-equal-p ()
|
| 166 : |
|
|
(< (sml-point-after (re-search-backward sml-=-starter-re nil 'move))
|
| 167 : |
|
|
(sml-point-after (re-search-backward "=" nil 'move))))
|
| 168 : |
|
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|
| 169 : |
|
|
(defun sml-nested-of-p ()
|
| 170 : |
|
|
(< (sml-point-after
|
| 171 : |
|
|
(re-search-backward sml-non-nested-of-starter-re nil 'move))
|
| 172 : |
|
|
(sml-point-after (re-search-backward "\\<case\\>" nil 'move))))
|
| 173 : |
|
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|
| 174 : |
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(defun sml-forward-sym-1 ()
|
| 175 : |
monnier |
319 |
(or (/= 0 (skip-syntax-forward ".'"))
|
| 176 : |
|
|
(/= 0 (skip-syntax-forward "'w_"))))
|
| 177 : |
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(defun sml-forward-sym ()
|
| 178 : |
|
|
(let ((sym (sml-move-read (sml-forward-sym-1))))
|
| 179 : |
monnier |
334 |
(cond
|
| 180 : |
|
|
((equal "op" sym)
|
| 181 : |
monnier |
333 |
(sml-forward-spaces)
|
| 182 : |
monnier |
334 |
(concat "op " (or (sml-move-read (sml-forward-sym-1)) "")))
|
| 183 : |
|
|
((equal sym "=")
|
| 184 : |
|
|
(save-excursion
|
| 185 : |
|
|
(sml-backward-sym-1)
|
| 186 : |
|
|
(if (sml-poly-equal-p) "=" "d=")))
|
| 187 : |
|
|
((equal sym "of")
|
| 188 : |
|
|
(save-excursion
|
| 189 : |
|
|
(sml-backward-sym-1)
|
| 190 : |
|
|
(if (sml-nested-of-p) "of" "=of")))
|
| 191 : |
|
|
(t sym))))
|
| 192 : |
monnier |
319 |
|
| 193 : |
monnier |
333 |
(defun sml-backward-sym-1 ()
|
| 194 : |
monnier |
319 |
(or (/= 0 (skip-syntax-backward ".'"))
|
| 195 : |
|
|
(/= 0 (skip-syntax-backward "'w_"))))
|
| 196 : |
monnier |
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(defun sml-backward-sym ()
|
| 197 : |
|
|
(let ((sym (sml-move-read (sml-backward-sym-1))))
|
| 198 : |
|
|
(when sym
|
| 199 : |
|
|
;; FIXME: what should we do if `sym' = "op" ?
|
| 200 : |
|
|
(let ((point (point)))
|
| 201 : |
|
|
(sml-backward-spaces)
|
| 202 : |
|
|
(if (equal "op" (sml-move-read (sml-backward-sym-1)))
|
| 203 : |
|
|
(concat "op " sym)
|
| 204 : |
|
|
(goto-char point)
|
| 205 : |
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(cond
|
| 206 : |
|
|
((string= sym "=") (if (sml-poly-equal-p) "=" "d="))
|
| 207 : |
|
|
((string= sym "of") (if (sml-nested-of-p) "of" "=of"))
|
| 208 : |
|
|
(t sym)))))))
|
| 209 : |
monnier |
333 |
|
| 210 : |
monnier |
319 |
|
| 211 : |
|
|
(defun sml-backward-sexp (prec)
|
| 212 : |
|
|
"Moves one sexp backward if possible, or one char else.
|
| 213 : |
|
|
Returns T if the move indeed moved through one sexp and NIL if not."
|
| 214 : |
|
|
(let ((parse-sexp-lookup-properties t)
|
| 215 : |
|
|
(parse-sexp-ignore-comments t))
|
| 216 : |
|
|
(sml-backward-spaces)
|
| 217 : |
|
|
(let* ((point (point))
|
| 218 : |
monnier |
333 |
(op (sml-backward-sym))
|
| 219 : |
monnier |
334 |
(op-prec (sml-op-prec op 'back))
|
| 220 : |
|
|
match)
|
| 221 : |
monnier |
319 |
(cond
|
| 222 : |
|
|
((not op)
|
| 223 : |
|
|
(let ((point (point)))
|
| 224 : |
|
|
(ignore-errors (backward-sexp 1))
|
| 225 : |
|
|
(if (/= point (point)) t (backward-char 1) nil)))
|
| 226 : |
monnier |
334 |
;; stop as soon as precedence is smaller than `prec'
|
| 227 : |
|
|
((and prec op-prec (>= prec op-prec)) nil)
|
| 228 : |
monnier |
319 |
;; special rules for nested constructs like if..then..else
|
| 229 : |
monnier |
334 |
((and (or (not prec) (and prec op-prec))
|
| 230 : |
monnier |
339 |
(setq match (second (assoc op sml-close-paren))))
|
| 231 : |
monnier |
334 |
(sml-find-match-backward (concat "\\<" op "\\>") match))
|
| 232 : |
|
|
;; don't back over open-parens
|
| 233 : |
|
|
((assoc op sml-open-paren) nil)
|
| 234 : |
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;; infix ops precedence
|
| 235 : |
|
|
((and prec op-prec) (< prec op-prec))
|
| 236 : |
|
|
;; [ prec = nil ] a new operator, let's skip the sexps until the next
|
| 237 : |
|
|
(op-prec (while (sml-move-if (sml-backward-sexp op-prec))) t)
|
| 238 : |
|
|
;; special symbols indicating we're getting out of a nesting level
|
| 239 : |
|
|
((string-match sml-sexp-head-symbols-re op) nil)
|
| 240 : |
|
|
;; if the op was not alphanum, then we still have to do the backward-sexp
|
| 241 : |
|
|
;; this reproduces the usual backward-sexp, but it might be bogus
|
| 242 : |
|
|
;; in this case since !@$% is a perfectly fine symbol
|
| 243 : |
|
|
(t t))))) ;(or (string-match "\\sw" op) (sml-backward-sexp prec))
|
| 244 : |
|
|
|
| 245 : |
|
|
(defun sml-forward-sexp (prec)
|
| 246 : |
|
|
"Moves one sexp forward if possible, or one char else.
|
| 247 : |
|
|
Returns T if the move indeed moved through one sexp and NIL if not."
|
| 248 : |
|
|
(let ((parse-sexp-lookup-properties t)
|
| 249 : |
|
|
(parse-sexp-ignore-comments t))
|
| 250 : |
|
|
(sml-forward-spaces)
|
| 251 : |
|
|
(let* ((point (point))
|
| 252 : |
monnier |
333 |
(op (sml-forward-sym))
|
| 253 : |
monnier |
319 |
(op-prec (sml-op-prec op 'forw)))
|
| 254 : |
|
|
(cond
|
| 255 : |
|
|
((not op)
|
| 256 : |
|
|
(let ((point (point)))
|
| 257 : |
|
|
(ignore-errors (forward-sexp 1))
|
| 258 : |
|
|
(if (/= point (point)) t (forward-char 1) nil)))
|
| 259 : |
monnier |
342 |
;; stop as soon as precedence is smaller than `prec'
|
| 260 : |
|
|
((and prec op-prec (>= prec op-prec)) nil)
|
| 261 : |
|
|
;; special rules for nested constructs like if..then..else
|
| 262 : |
|
|
((and (or (not prec) (and prec op-prec))
|
| 263 : |
|
|
(setq match (cdr (assoc op sml-open-paren))))
|
| 264 : |
|
|
(sml-find-match-forward (first match) (second match)))
|
| 265 : |
|
|
;; don't back over open-parens
|
| 266 : |
|
|
((assoc op sml-close-paren) nil)
|
| 267 : |
monnier |
319 |
;; infix ops precedence
|
| 268 : |
|
|
((and prec op-prec) (< prec op-prec))
|
| 269 : |
|
|
;; [ prec = nil ] a new operator, let's skip the sexps until the next
|
| 270 : |
|
|
(op-prec (while (sml-move-if (sml-forward-sexp op-prec))) t)
|
| 271 : |
|
|
;; special symbols indicating we're getting out of a nesting level
|
| 272 : |
|
|
((string-match sml-sexp-head-symbols-re op) nil)
|
| 273 : |
|
|
;; if the op was not alphanum, then we still have to do the backward-sexp
|
| 274 : |
|
|
;; this reproduces the usual backward-sexp, but it might be bogus
|
| 275 : |
|
|
;; in this case since !@$% is a perfectly fine symbol
|
| 276 : |
|
|
(t t))))) ;(or (string-match "\\sw" op) (sml-backward-sexp prec))
|
| 277 : |
|
|
|
| 278 : |
|
|
(defun sml-in-word-p ()
|
| 279 : |
monnier |
332 |
(and (eq ?w (char-syntax (or (char-before) ? )))
|
| 280 : |
|
|
(eq ?w (char-syntax (or (char-after) ? )))))
|
| 281 : |
monnier |
319 |
|
| 282 : |
|
|
(defun sml-user-backward-sexp (&optional count)
|
| 283 : |
|
|
"Like `backward-sexp' but tailored to the SML syntax."
|
| 284 : |
|
|
(interactive "p")
|
| 285 : |
|
|
(unless count (setq count 1))
|
| 286 : |
|
|
(sml-with-ist
|
| 287 : |
|
|
(let ((point (point)))
|
| 288 : |
|
|
(if (< count 0) (sml-user-forward-sexp (- count))
|
| 289 : |
|
|
(when (sml-in-word-p) (forward-word 1))
|
| 290 : |
|
|
(dotimes (i count)
|
| 291 : |
|
|
(unless (sml-backward-sexp nil)
|
| 292 : |
|
|
(goto-char point)
|
| 293 : |
|
|
(error "Containing expression ends prematurely")))))))
|
| 294 : |
|
|
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| 295 : |
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(defun sml-user-forward-sexp (&optional count)
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| 296 : |
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"Like `forward-sexp' but tailored to the SML syntax."
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| 297 : |
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(interactive "p")
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| 298 : |
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(unless count (setq count 1))
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| 299 : |
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(sml-with-ist
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| 300 : |
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(let ((point (point)))
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| 301 : |
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(if (< count 0) (sml-user-backward-sexp (- count))
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| 302 : |
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(when (sml-in-word-p) (backward-word 1))
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| 303 : |
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(dotimes (i count)
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| 304 : |
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(unless (sml-forward-sexp nil)
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| 305 : |
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(goto-char point)
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| 306 : |
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(error "Containing expression ends prematurely")))))))
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| 307 : |
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| 308 : |
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;;(defun sml-forward-thing ()
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| 309 : |
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;; (if (= ?w (char-syntax (char-after))) (forward-word 1) (forward-char 1)))
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| 310 : |
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| 311 : |
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(defun sml-backward-arg () (sml-backward-sexp 1000))
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| 312 : |
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(defun sml-forward-arg () (sml-forward-sexp 1000))
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| 313 : |
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| 314 : |
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;;
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| 315 : |
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(provide 'sml-move)
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