lisp/progmodes/meta-mode.el

   1 ;;; meta-mode.el --- major mode for editing Metafont or MetaPost sources -*- lexical-binding:t -*-
   2
   3 ;; Copyright (C) 1997, 2001-2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Ulrik Vieth <vieth@thphy.uni-duesseldorf.de>
   6 ;; Version: 1.0
   7 ;; Keywords: Metafont, MetaPost, tex, languages
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Description:
  27 ;;
  28 ;; This Emacs Lisp package provides a major mode for editing Metafont
  29 ;; or MetaPost sources.  It includes all the necessary code to set up
  30 ;; a major mode including an appropriate syntax table, keymap, and a
  31 ;; mode-specific pull-down menu.  It also provides a sophisticated set
  32 ;; of font-lock patterns, a fancy indentation function adapted from
  33 ;; AUCTeX's latex.el, and some basic mode-specific editing functions
  34 ;; such as functions to move to the beginning or end of the enclosing
  35 ;; environment, or to mark, re-indent, or comment-out environments.
  36 ;; On the other hand, it doesn't yet provide any functionality for
  37 ;; running Metafont or MetaPost in a shell buffer from within Emacs,
  38 ;; but such functionality might be added later, either as part of this
  39 ;; package or as a separate Emacs Lisp package.
  40
  41 ;; Customization:
  42 ;;
  43 ;; Following the usual Emacs Lisp coding conventions, the major modes
  44 ;; defined in this package provide several hook variables to allow for
  45 ;; local customization when entering the modes.  In particular, there
  46 ;; is a `meta-common-mode-hook' which applies to both modes as well as
  47 ;; `metafont-mode-hook' and `metapost-mode-hook' which apply to the
  48 ;; individual modes.  In addition, there are several variables and
  49 ;; regexps controlling e.g. the behavior of the indentation function,
  50 ;; which may be customized via `edit-options'.  Please refer to the
  51 ;; docstrings in the code below for details.
  52
  53 ;; Availability:
  54 ;;
  55 ;; As of this version 1.0, this package will be uploaded to CTAN
  56 ;; archives, where it shall find a permanent home, presumably in
  57 ;; tex-archive/support/emacs-modes.  It will also be submitted for
  58 ;; integration into the GNU Emacs distribution at that time.
  59 ;;
  60 ;; History:
  61 ;;
  62 ;; v 0.0 -- 1997/02/01  UV  Started writing meta-mode.el.
  63 ;; v 0.1 -- 1997/02/02  UV  Added preliminary set of font-lock patterns.
  64 ;; v 0.2 -- 1997/02/03  UV  Improved and debugged font-lock patterns.
  65 ;;                          Added indent-line-function for TAB.
  66 ;; v 0.3 -- 1997/02/17  UV  Improved font-lock patterns and syntax table.
  67 ;;                          Improved and debugged indentation function.
  68 ;; v 0.4 -- 1997/02/18  UV  Added functions to indent regions for M-C-q,
  69 ;;                          also added a preliminary mode-specific menu.
  70 ;; v 0.5 -- 1997/02/19  UV  Added functions to skip to next or previous
  71 ;;                          defun and to re-indent or comment-out defuns.
  72 ;; v 0.6 -- 1997/02/20  UV  More debugging, testing and clean-up.
  73 ;; v 0.7 -- 1997/02/22  UV  Use easymenu to define mode-specific menu.
  74 ;; v 0.8 -- 1997/02/24  UV  Added completion function for M-TAB.
  75 ;; v 0.9 -- 1997/03/08  UV  Added fill-paragraph function for comments.
  76 ;;                          Also fixed a few remaining font-lock problems.
  77 ;;                          Added meta-mode-load-hook to load meta-buf.el.
  78 ;; v 1.0 -- 1997/04/07  UV  Cleanup for official public release.
  79 ;;
  80 ;; Historical Footnote:
  81 ;;
  82 ;; This package was begun on February 1, 1997, exactly 20 years after
  83 ;; the genesis of TeX took place according to Don Knuth's own account
  84 ;; (cf.  ``The Errors of TeX'', reprinted in ``Literate Programming'',
  85 ;; Chapter 10, p. 249).  What better date could there be to choose?
  86 ;;
  87
  88 \f
  89 ;;; Code:
  90
  91 (require 'easymenu)
  92
  93 (defgroup meta-font nil
  94   "Major mode for editing Metafont or MetaPost sources."
  95   :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
  96   :group 'languages)
  97
  98 ;;; Fontification.
  99
 100 (defvar meta-font-lock-keywords
 101       (let ((input-keywords
 102              "\\(input\\|generate\\)")
 103             (begin-keywords
 104              (concat "\\(begin\\(char\\|fig\\|graph\\|logochar\\)\\|"
 105                      "\\cmchar\\|dcchar\\|ecchar\\)"))
 106             (end-keywords
 107              "\\(end\\(char\\|fig\\|graph\\)\\)")
 108             (macro-keywords-1
 109              "\\(def\\|let\\|mode_def\\|vardef\\)")
 110             (macro-keywords-2
 111              "\\(primarydef\\|secondarydef\\|tertiarydef\\)")
 112 ;(make-regexp
 113 ; '("expr" "suffix" "text" "primary" "secondary" "tertiary") t)
 114             (args-keywords
 115              (concat "\\(expr\\|primary\\|s\\(econdary\\|uffix\\)\\|"
 116                      "te\\(rtiary\\|xt\\)\\)"))
 117 ;(make-regexp
 118 ; '("boolean" "color" "numeric" "pair" "path" "pen" "picture"
 119 ;   "string" "transform" "newinternal") t)
 120             (type-keywords
 121              (concat "\\(boolean\\|color\\|n\\(ewinternal\\|umeric\\)\\|"
 122                      "p\\(a\\(ir\\|th\\)\\|en\\|icture\\)\\|string\\|"
 123                      "transform\\)"))
 124 ;(make-regexp
 125 ; '("for" "forever" "forsuffixes" "endfor"
 126 ;   "step" "until" "upto" "downto" "thru" "within"
 127 ;   "iff" "if" "elseif" "else" "fi" "exitif" "exitunless"
 128 ;   "let" "def" "vardef" "enddef" "mode_def"
 129 ;   "true" "false" "known" "unknown" "and" "or" "not"
 130 ;   "save" "interim" "inner" "outer" "relax"
 131 ;   "begingroup" "endgroup" "expandafter" "scantokens"
 132 ;   "generate" "input" "endinput" "end" "bye"
 133 ;   "message" "errmessage" "errhelp" "special" "numspecial"
 134 ;   "readstring" "readfrom" "write") t)
 135             (syntactic-keywords
 136              (concat "\\(and\\|b\\(egingroup\\|ye\\)\\|"
 137                      "d\\(ef\\|ownto\\)\\|e\\(lse\\(\\|if\\)"
 138                      "\\|nd\\(\\|def\\|for\\|group\\|input\\)"
 139                      "\\|rr\\(help\\|message\\)"
 140                      "\\|x\\(it\\(if\\|unless\\)\\|pandafter\\)\\)\\|"
 141                      "f\\(alse\\|i\\|or\\(\\|ever\\|suffixes\\)\\)\\|"
 142                      "generate\\|i\\(ff?\\|n\\(ner\\|put\\|terim\\)\\)\\|"
 143                      "known\\|let\\|m\\(essage\\|ode_def\\)\\|"
 144                      "n\\(ot\\|umspecial\\)\\|o\\(r\\|uter\\)\\|"
 145                      "re\\(ad\\(from\\|string\\)\\|lax\\)\\|"
 146                      "s\\(ave\\|cantokens\\|pecial\\|tep\\)\\|"
 147                      "t\\(hru\\|rue\\)\\|"
 148                      "u\\(n\\(known\\|til\\)\\|pto\\)\\|"
 149                      "vardef\\|w\\(ithin\\|rite\\)\\)"))
 150             )
 151         (list
 152          ;; embedded TeX code in btex ... etex
 153          (cons (concat "\\(btex\\|verbatimtex\\)"
 154                        "[ \t\f]+\\(.*\\)[ \t\f]+"
 155                        "\\(etex\\)")
 156                '((1 font-lock-keyword-face)
 157                  (2 font-lock-string-face)
 158                  (3 font-lock-keyword-face)))
 159          ;; unary macro definitions: def, vardef, let
 160          (cons (concat "\\<" macro-keywords-1 "\\>"
 161                        "[ \t\f]+\\(\\sw+\\|\\s_+\\|\\s.+\\)")
 162                '((1 font-lock-keyword-face)
 163                  (2 font-lock-function-name-face)))
 164          ;; binary macro definitions: <leveldef> x operator y
 165          (cons (concat "\\<" macro-keywords-2 "\\>"
 166                        "[ \t\f]+\\(\\sw+\\)"
 167                        "[ \t\f]*\\(\\sw+\\|\\s.+\\)"
 168                        "[ \t\f]*\\(\\sw+\\)")
 169                '((1 font-lock-keyword-face)
 170                  (2 font-lock-variable-name-face nil t)
 171                  (3 font-lock-function-name-face nil t)
 172                  (4 font-lock-variable-name-face nil t)))
 173          ;; variable declarations: numeric, pair, color, ...
 174          (cons (concat "\\<" type-keywords "\\>"
 175                        "\\([ \t\f]+\\(\\sw+\\)\\)*")
 176                '((1 font-lock-type-face)
 177                  (font-lock-match-meta-declaration-item-and-skip-to-next
 178                   (goto-char (match-end 1)) nil
 179                   (1 font-lock-variable-name-face nil t))))
 180          ;; argument declarations: expr, suffix, text, ...
 181          (cons (concat "\\<" args-keywords "\\>"
 182                        "\\([ \t\f]+\\(\\sw+\\|\\s_+\\)\\)*")
 183                '((1 font-lock-type-face)
 184                  (font-lock-match-meta-declaration-item-and-skip-to-next
 185                   (goto-char (match-end 1)) nil
 186                   (1 font-lock-variable-name-face nil t))))
 187          ;; special case of arguments: expr x of y
 188          (cons (concat "\\(expr\\)[ \t\f]+\\(\\sw+\\)"
 189                        "[ \t\f]+\\(of\\)[ \t\f]+\\(\\sw+\\)")
 190                '((1 font-lock-type-face)
 191                  (2 font-lock-variable-name-face)
 192                  (3 font-lock-keyword-face nil t)
 193                  (4 font-lock-variable-name-face nil t)))
 194          ;; syntactic keywords
 195          (cons (concat "\\<" syntactic-keywords "\\>")
 196                'font-lock-keyword-face)
 197          ;; beginchar, beginfig
 198          (cons (concat "\\<" begin-keywords "\\>")
 199                'font-lock-keyword-face)
 200          ;; endchar, endfig
 201          (cons (concat "\\<" end-keywords "\\>")
 202                'font-lock-keyword-face)
 203          ;; input, generate
 204          (cons (concat "\\<" input-keywords "\\>"
 205                        "[ \t\f]+\\(\\sw+\\)")
 206                '((1 font-lock-keyword-face)
 207                  (2 font-lock-constant-face)))
 208          ;; embedded Metafont/MetaPost code in comments
 209          (cons "|\\([^|]+\\)|"
 210                '(1 font-lock-constant-face t))
 211      ))
 212   "Default expressions to highlight in Metafont or MetaPost mode.")
 213
 214
 215 (defun font-lock-match-meta-declaration-item-and-skip-to-next (limit)
 216   ;; Match and move over Metafont/MetaPost declaration item after point.
 217   ;;
 218   ;; The expected syntax of an item is either "word" or "symbol",
 219   ;; possibly ending with optional whitespace.  Everything following
 220   ;; the item (but belonging to it) is expected to by skipable by
 221   ;; `forward-sexp'.  The list of items is expected to be separated
 222   ;; by commas and terminated by semicolons or equals signs.
 223   ;;
 224   (if (looking-at "[ \t\f]*\\(\\sw+\\|\\s_+\\)")
 225       (save-match-data
 226         (condition-case nil
 227             (save-restriction
 228               ;; Restrict to end of line, currently guaranteed to be LIMIT.
 229               (narrow-to-region (point-min) limit)
 230               (goto-char (match-end 1))
 231               ;; Move over any item value, etc., to the next item.
 232               (while (not (looking-at "[ \t\f]*\\(\\(,\\)\\|;\\|=\\|$\\)"))
 233                 (goto-char (or (scan-sexps (point) 1) (point-max))))
 234               (goto-char (match-end 2)))
 235           (error t)))))
 236
 237
 238 \f
 239 ;;; Completion.
 240
 241 ;; The data used to prepare the following lists of primitives and
 242 ;; standard macros available in Metafont or MetaPost was extracted
 243 ;; from the original sources like this:
 244 ;;
 245 ;;   grep '^primitive' texk-7.0/web2c/{mf,mp}.web |\
 246 ;;   sed 's/primitive(\("[a-zA-Z]*"\).*/\1/' > {mf,mp}_prim.list
 247 ;;
 248 ;;   grep '\(let\|def\|vardef\|primarydef\|secondarydef\|tertiarydef\)'
 249 ;;     texmf/meta{font,post}/plain.{mf,mp} > {mf,mp}_plain.list
 250
 251 (defconst meta-common-primitives-list
 252   '("ASCII" "addto" "also" "and" "angle" "atleast" "batchmode"
 253     "begingroup" "boolean" "boundarychar" "char" "charcode" "chardp"
 254     "charexists" "charext" "charht" "charic" "charlist" "charwd"
 255     "contour" "controls" "cosd" "curl" "cycle" "day" "decimal" "def"
 256     "delimiters" "designsize" "directiontime" "doublepath" "dump" "else"
 257     "elseif" "end" "enddef" "endfor" "endgroup" "endinput" "errhelp"
 258     "errmessage" "errorstopmode" "everyjob" "exitif" "expandafter"
 259     "expr" "extensible" "false" "fi" "floor" "fontdimen" "fontmaking"
 260     "for" "forever" "forsuffixes" "headerbyte" "hex" "if" "inner"
 261     "input" "interim" "intersectiontimes" "jobname" "kern" "known"
 262     "length" "let" "ligtable" "makepath" "makepen" "message" "mexp"
 263     "mlog" "month" "newinternal" "nonstopmode" "normaldeviate" "not"
 264     "nullpen" "nullpicture" "numeric" "oct" "odd" "of" "or" "outer"
 265     "pair" "path" "pausing" "pen" "pencircle" "penoffset" "picture"
 266     "point" "postcontrol" "precontrol" "primary" "primarydef" "quote"
 267     "randomseed" "readstring" "reverse" "rotated" "save" "scaled"
 268     "scantokens" "scrollmode" "secondary" "secondarydef" "shifted"
 269     "shipout" "show" "showdependencies" "showstats" "showstopping"
 270     "showtoken" "showvariable" "sind" "skipto" "slanted" "special"
 271     "sqrt" "step" "str" "string" "subpath" "substring" "suffix"
 272     "tension" "tertiary" "tertiarydef" "text" "time" "to"
 273     "tracingcapsules" "tracingchoices" "tracingcommands"
 274     "tracingequations" "tracingmacros" "tracingonline" "tracingoutput"
 275     "tracingrestores" "tracingspecs" "tracingstats" "tracingtitles"
 276     "transform" "transformed" "true" "turningnumber" "uniformdeviate"
 277     "unknown" "until" "vardef" "warningcheck" "withpen" "xpart"
 278     "xscaled" "xxpart" "xypart" "year" "ypart" "yscaled" "yxpart"
 279     "yypart" "zscaled")
 280   "List of primitives common to Metafont and MetaPost.")
 281
 282 (defconst metafont-primitives-list
 283   '("at" "autorounding" "chardx" "chardy" "cull" "display"
 284     "dropping" "fillin" "from" "granularity" "hppp" "inwindow"
 285     "keeping" "numspecial" "openwindow" "proofing" "smoothing"
 286     "totalweight" "tracingedges" "tracingpens" "turningcheck" "vppp"
 287     "withweight" "xoffset" "yoffset")
 288   "List of primitives only defined in Metafont.")
 289
 290 (defconst metapost-primitives-list
 291   '("arclength" "arctime" "bluepart" "bounded" "btex" "clip"
 292     "clipped" "color" "dashed" "dashpart" "etex" "filled" "fontpart"
 293     "fontsize" "greenpart" "infont" "linecap" "linejoin" "llcorner"
 294     "lrcorner" "miterlimit" "mpxbreak" "pathpart" "penpart"
 295     "prologues" "readfrom" "redpart" "setbounds" "stroked" "textpart"
 296     "textual" "tracinglostchars" "truecorners" "ulcorner" "urcorner"
 297     "verbatimtex" "withcolor" "within" "write")
 298   "List of primitives only defined in MetaPost.")
 299
 300 (defconst meta-common-plain-macros-list
 301   '( "abs" "bot" "bye" "byte" "ceiling" "clear_pen_memory"
 302      "clearit" "clearpen" "clearxy" "counterclockwise" "cutdraw" "decr"
 303      "dir" "direction" "directionpoint" "div" "dotprod" "downto" "draw"
 304      "drawdot" "erase" "exitunless" "fill" "filldraw" "flex" "gobble"
 305      "hide" "incr" "interact" "interpath" "intersectionpoint" "inverse"
 306      "label" "labels" "lft" "loggingall" "magstep" "makelabel" "max"
 307      "min" "mod" "numtok" "penlabels" "penpos" "penstroke" "pickup"
 308      "range" "reflectedabout" "relax" "rotatedabout" "rotatedaround"
 309      "round" "rt" "savepen" "shipit" "softjoin" "solve" "stop"
 310      "superellipse" "takepower" "tensepath" "thru" "top" "tracingall"
 311      "tracingnone" "undraw" "undrawdot" "unfill" "unfilldraw"
 312      "unitvector" "upto" "whatever")
 313   "List of macros common to plain Metafont and MetaPost.")
 314
 315 (defconst metafont-plain-macros-list
 316   '("beginchar" "change_width" "culldraw" "cullit" "cutoff"
 317     "define_blacker_pixels" "define_corrected_pixels"
 318     "define_good_x_pixels" "define_good_y_pixels"
 319     "define_horizontal_corrected_pixels" "define_pixels"
 320     "define_whole_blacker_pixels" "define_whole_pixels"
 321     "define_whole_vertical_blacker_pixels"
 322     "define_whole_vertical_pixels" "endchar" "fix_units"
 323     "font_coding_scheme" "font_extra_space" "font_identifier"
 324     "font_normal_shrink" "font_normal_space" "font_normal_stretch"
 325     "font_quad" "font_size" "font_slant" "font_x_height" "gfcorners"
 326     "good.bot" "good.lft" "good.rt" "good.top" "good.x" "good.y"
 327     "grayfont" "hround" "imagerules" "italcorr" "labelfont"
 328     "lowres_fix" "makebox" "makegrid" "maketicks" "mode_lowres"
 329     "mode_proof" "mode_setup" "mode_smoke" "nodisplays" "notransforms"
 330     "openit" "penrazor" "pensquare" "proofoffset" "proofrule"
 331     "proofrulethickness" "screenchars" "screenrule" "screenstrokes"
 332     "showit" "slantfont" "smode" "titlefont" "vround")
 333   "List of macros only defined in plain Metafont.")
 334
 335 (defconst metapost-plain-macros-list
 336   '("arrowhead" "bbox" "beginfig" "buildcycle" "center" "cutafter"
 337     "cutbefore" "dashpattern" "dotlabel" "dotlabels" "drawarrow"
 338     "drawdblarrow" "drawoptions" "endfig" "image" "label" "off" "on"
 339     "thelabel")
 340   "List of macros only defined in plain MetaPost.")
 341
 342 (defconst metapost-graph-macros-list
 343   '("augment" "auto.x" "auto.y" "autogrid" "begingraph" "endgraph"
 344     "format" "frame" "gdata" "gdotlabel" "gdraw" "gdrawarrow"
 345     "gdrawdblarrow" "gfill" "glabel" "grid" "itick" "otick" "plot"
 346     "setcoords" "setrange")
 347   "List of macros only defined in MetaPost \"graph\" package.")
 348
 349 (defconst metapost-boxes-macros-list
 350   '("boxit" "boxjoin" "bpath" "circleit" "drawboxed" "drawboxes"
 351     "drawunboxed" "fixpos" "fixsize" "pic" "rboxit")
 352   "List of macros only defined in MetaPost \"boxes\" package.")
 353
 354
 355 (defvar metafont-symbol-list
 356   (append meta-common-primitives-list
 357           metafont-primitives-list
 358           meta-common-plain-macros-list
 359           metafont-plain-macros-list)
 360   "List of known symbols to complete in Metafont mode.")
 361
 362 (defvar metapost-symbol-list
 363   (append meta-common-primitives-list
 364           metapost-primitives-list
 365           meta-common-plain-macros-list
 366           metapost-plain-macros-list
 367           metapost-graph-macros-list
 368           metapost-boxes-macros-list)
 369   "List of known symbols to complete in MetaPost mode.")
 370
 371
 372 (defvar meta-symbol-list nil
 373   "List of known symbols to complete in Metafont or MetaPost mode.")
 374
 375 (defvar meta-symbol-changed nil
 376   "Flag indicating whether `meta-symbol-list' has been initialized.")
 377
 378 (defvar meta-complete-list nil
 379 ;  (list (list "\\<\\(\\sw+\\)" 1 'meta-symbol-list)
 380 ;        (list "" 'ispell-complete-word))
 381   "List of ways to perform completion in Metafont or MetaPost mode.
 382
 383 Each entry is a list with the following elements:
 384 1. Regexp matching the preceding text.
 385 2. A number indicating the subgroup in the regexp containing the text.
 386 3. A function returning an alist of possible completions.
 387 4. Text to append after a successful completion (if any).
 388
 389 Or alternatively:
 390 1. Regexp matching the preceding text.
 391 2. Function to do the actual completion.")
 392
 393
 394 (defun meta-add-symbols (&rest entries)
 395   "Add entries to list of known symbols in Metafont or MetaPost mode."
 396   (if meta-symbol-changed
 397       (setq meta-symbol-list (cons entries meta-symbol-list))
 398     (setq meta-symbol-changed t)
 399     (setq meta-symbol-list (cons entries meta-symbol-list))))
 400
 401 (defun meta-symbol-list ()
 402   "Return value of list of known symbols in Metafont or MetaPost mode.
 403 If the list was changed, sort the list and remove duplicates first."
 404   (if (not meta-symbol-changed)
 405       ()
 406     (setq meta-symbol-changed nil)
 407     (message "Preparing completion list...")
 408     ;; sort list of symbols
 409     (setq meta-symbol-list
 410           (sort (mapcar 'meta-listify (apply 'append meta-symbol-list))
 411                 'meta-car-string-lessp))
 412     ;; remove duplicates
 413     (let ((entry meta-symbol-list))
 414       (while (and entry (cdr entry))
 415         (let ((this (car entry))
 416               (next (car (cdr entry))))
 417           (if (not (string-equal (car this) (car next)))
 418               (setq entry (cdr entry))
 419             (if (> (length next) (length this))
 420                 (setcdr this (cdr next)))
 421             (setcdr entry (cdr (cdr entry)))))))
 422     (message "Preparing completion list... done"))
 423   meta-symbol-list)
 424
 425 (defun meta-listify (a)
 426   ;; utility function used in `meta-add-symbols'
 427   (if (listp a) a (list a)))
 428
 429 (defun meta-car-string-lessp (a b)
 430   ;; utility function used in `meta-add-symbols'
 431   (string-lessp (car a) (car b)))
 432
 433
 434 (defun meta-completions-at-point ()
 435   (let ((list meta-complete-list)
 436         entry)
 437     (while list
 438       (setq entry (car list)
 439             list (cdr list))
 440       (if (looking-back (car entry) (max (point-min) (- (point) 200)))
 441           (setq list nil)))
 442     (if (numberp (nth 1 entry))
 443         (let* ((sub (nth 1 entry))
 444                (close (nth 3 entry))
 445                (begin (match-beginning sub))
 446                (end (match-end sub))
 447                (list (funcall (nth 2 entry))))
 448           (list
 449            begin end list
 450            :exit-function
 451            (unless (zerop (length close))
 452              (lambda (_s finished)
 453                (when (memq finished '(sole finished))
 454                  (if (looking-at (regexp-quote close))
 455                      (goto-char (match-end 0))
 456                    (insert close)))))))
 457       (nth 1 entry))))
 458
 459 (define-obsolete-function-alias 'meta-complete-symbol
 460   'completion-at-point "24.1")
 461 \f
 462 ;;; Indentation.
 463
 464 (defcustom meta-indent-level 2
 465   "Indentation of begin-end blocks in Metafont or MetaPost mode."
 466   :type 'integer
 467   :group 'meta-font)
 468
 469
 470 (defcustom meta-left-comment-regexp "%%+"
 471   "Regexp matching comments that should be placed on the left margin."
 472   :type 'regexp
 473   :group 'meta-font)
 474
 475 (defcustom meta-right-comment-regexp nil
 476   "Regexp matching comments that should be placed on the right margin."
 477   :type '(choice regexp
 478                  (const :tag "None" nil))
 479   :group 'meta-font)
 480
 481 (defcustom meta-ignore-comment-regexp "%[^%]"
 482   "Regexp matching comments whose indentation should not be touched."
 483   :type 'regexp
 484   :group 'meta-font)
 485
 486
 487 (defcustom meta-begin-environment-regexp
 488   (concat "\\(begin\\(char\\|fig\\|gr\\(aph\\|oup\\)\\|logochar\\)\\|"
 489           "def\\|for\\(\\|ever\\|suffixes\\)\\|if\\|mode_def\\|"
 490           "primarydef\\|secondarydef\\|tertiarydef\\|vardef\\)")
 491   "Regexp matching the beginning of environments to be indented."
 492   :type 'regexp
 493   :group 'meta-font)
 494
 495 (defcustom meta-end-environment-regexp
 496   (concat "\\(end\\(char\\|def\\|f\\(ig\\|or\\)\\|gr\\(aph\\|oup\\)\\)"
 497           "\\|fi\\)")
 498   "Regexp matching the end of environments to be indented."
 499   :type 'regexp
 500   :group 'meta-font)
 501
 502 (defcustom meta-within-environment-regexp
 503 ; (concat "\\(e\\(lse\\(\\|if\\)\\|xit\\(if\\|unless\\)\\)\\)")
 504   (concat "\\(else\\(\\|if\\)\\)")
 505   "Regexp matching keywords within environments not to be indented."
 506   :type 'regexp
 507   :group 'meta-font)
 508
 509
 510 (defun meta-comment-indent ()
 511   "Return the indentation for a comment in Metafont or MetaPost mode."
 512   (if (and meta-left-comment-regexp
 513            (looking-at meta-left-comment-regexp))
 514       (current-column)
 515     (skip-chars-backward "\t\f ")
 516     (max (if (bolp) 0 (1+ (current-column)))
 517          comment-column)))
 518
 519 (defun meta-indent-line ()
 520   "Indent the line containing point as Metafont or MetaPost source."
 521   (interactive)
 522   (let ((indent (meta-indent-calculate)))
 523     (if (/= (current-indentation) indent)
 524         (save-excursion
 525           (delete-region (line-beginning-position)
 526                          (progn (back-to-indentation) (point)))
 527           (indent-to indent)))
 528     (if (< (current-column) indent)
 529         (back-to-indentation))))
 530
 531 (defun meta-indent-calculate ()
 532   "Return the indentation of current line of Metafont or MetaPost source."
 533   ;; Indentation within strings is not considered as Meta* don't allow multi
 534   ;; line strings.
 535   (save-excursion
 536     (back-to-indentation)
 537     (cond
 538      ;; Comments to the left margin.
 539      ((and meta-left-comment-regexp
 540            (looking-at meta-left-comment-regexp))
 541       0)
 542      ;; Comments to the right margin.
 543      ((and meta-right-comment-regexp
 544            (looking-at meta-right-comment-regexp))
 545       comment-column)
 546      ;; Comments best left alone.
 547      ((and meta-ignore-comment-regexp
 548            (looking-at meta-ignore-comment-regexp))
 549       (current-indentation))
 550      ;; Beginning of buffer.
 551      ((eq (point-at-bol) (point-min))
 552       0)
 553      ;; Backindent at end of environments.
 554      ((meta-indent-looking-at-code
 555        (concat "\\<" meta-end-environment-regexp "\\>"))
 556       (- (meta-indent-current-indentation) meta-indent-level))
 557      ;; Backindent at keywords within environments.
 558      ((meta-indent-looking-at-code
 559        (concat "\\<" meta-within-environment-regexp "\\>"))
 560       (- (meta-indent-current-indentation) meta-indent-level))
 561      (t (meta-indent-current-indentation)))))
 562
 563 (defun meta-indent-in-string-p ()
 564   "Tell if the point is in a string."
 565   (or (nth 3 (syntax-ppss))
 566       (eq (get-text-property (point) 'face) font-lock-string-face)))
 567
 568 (defun meta-indent-looking-at-code (regexp)
 569   "Same as `looking-at' but checks that the point is not in a string."
 570   (unless (meta-indent-in-string-p)
 571     (looking-at regexp)))
 572
 573 (defun meta-indent-previous-line ()
 574   "Go to the previous line of code, skipping comments."
 575   (skip-chars-backward "\n\t\f ")
 576   (move-to-column (current-indentation))
 577   ;; Ignore comments.
 578   (while (and (looking-at comment-start) (not (bobp)))
 579     (skip-chars-backward "\n\t\f ")
 580     (when (not (bobp))
 581       (move-to-column (current-indentation)))))
 582
 583 (defun meta-indent-unfinished-line ()
 584   "Tell if the current line of code ends with an unfinished expression."
 585   (save-excursion
 586     (end-of-line)
 587     ;; Skip backward the comments.
 588     (let ((point-not-in-string (point)))
 589       (while (search-backward comment-start (point-at-bol) t)
 590         (unless (meta-indent-in-string-p)
 591           (setq point-not-in-string (point))))
 592       (goto-char point-not-in-string))
 593     ;; Search for the end of the previous expression.
 594     (if (search-backward ";" (point-at-bol) t)
 595         (progn (while (and (meta-indent-in-string-p)
 596                            (search-backward ";" (point-at-bol) t)))
 597                (if (= (char-after) ?\;)
 598                    (forward-char)
 599                  (beginning-of-line)))
 600       (beginning-of-line))
 601     ;; See if the last statement of the line is environment-related,
 602     ;; or exists at all.
 603     (if (meta-indent-looking-at-code
 604          (concat "[ \t\f]*\\($\\|" (regexp-quote comment-start)
 605                  "\\|\\<" meta-end-environment-regexp "\\>"
 606                  "\\|\\<" meta-begin-environment-regexp "\\>"
 607                  "\\|\\<" meta-within-environment-regexp "\\>\\)"))
 608         nil
 609       t)))
 610
 611 (defun meta-indent-current-indentation ()
 612   "Return the indentation wanted for the current line of code."
 613   (+ (meta-indent-current-nesting)
 614      (if (save-excursion
 615            (back-to-indentation)
 616            (and (not (looking-at (concat "\\<" meta-end-environment-regexp "\\>"
 617                                          "\\|\\<" meta-within-environment-regexp "\\>")))
 618                 (progn (meta-indent-previous-line)
 619                        (meta-indent-unfinished-line))))
 620          meta-indent-level
 621        0)))
 622
 623 (defun meta-indent-current-nesting ()
 624   "Return the indentation according to the nearest environment keyword."
 625   (save-excursion
 626     (save-restriction
 627       (widen)
 628       (back-to-indentation)
 629       (let ((to-add 0))
 630         ;; If we found some environment marker backward...
 631         (if (catch 'found
 632               (while (re-search-backward
 633                       (concat "(\\|)\\|\\<" meta-end-environment-regexp "\\>"
 634                               "\\|\\<" meta-begin-environment-regexp "\\>"
 635                               "\\|\\<" meta-within-environment-regexp "\\>")
 636                       nil t)
 637                 ;; If we aren't in a string or in a comment, we've found something.
 638                 (unless (or (meta-indent-in-string-p)
 639                             (nth 4 (syntax-ppss)))
 640                   (cond ((= (char-after) ?\()
 641                          (setq to-add (+ to-add meta-indent-level)))
 642                         ((= (char-after) ?\))
 643                          (setq to-add (- to-add meta-indent-level)))
 644                         (t (throw 'found t))))))
 645             (progn
 646               ;; ... then use it to compute the current indentation.
 647               (back-to-indentation)
 648               (+ to-add (current-indentation) (meta-indent-level-count)
 649                  ;; Compensate for backindent of end and within keywords.
 650                  (if (meta-indent-looking-at-code
 651                       (concat "\\<" meta-end-environment-regexp "\\>\\|"
 652                               "\\<" meta-within-environment-regexp "\\>"))
 653                      meta-indent-level
 654                    ;; Compensate for unfinished line.
 655                    (if (save-excursion
 656                          (meta-indent-previous-line)
 657                          (meta-indent-unfinished-line))
 658                        (- meta-indent-level)
 659                      0))))
 660           0)))))
 661
 662 (defun meta-indent-level-count ()
 663   "Count indentation change for begin-end commands in the current line."
 664   (save-excursion
 665     (save-restriction
 666       (let ((count 0))
 667         (narrow-to-region
 668          (point) (save-excursion
 669                    (re-search-forward "[^\\\\\"]%\\|\n\\|\\'" nil t)
 670                    (backward-char) (point)))
 671         (while (re-search-forward "\\<\\sw+\\>\\|(\\|)" nil t)
 672           (save-excursion
 673             (goto-char (match-beginning 0))
 674             (cond
 675              ;; Count number of begin-end keywords within line.
 676              ((meta-indent-looking-at-code
 677                (concat "\\<" meta-begin-environment-regexp "\\>"))
 678               (setq count (+ count meta-indent-level)))
 679              ((meta-indent-looking-at-code
 680                (concat "\\<" meta-end-environment-regexp "\\>"))
 681               (setq count (- count meta-indent-level))))))
 682         count))))
 683
 684
 685 \f
 686 ;;; Editing commands.
 687
 688 (defcustom meta-begin-defun-regexp
 689   (concat "\\(begin\\(char\\|fig\\|logochar\\)\\|def\\|mode_def\\|"
 690           "primarydef\\|secondarydef\\|tertiarydef\\|vardef\\)")
 691   "Regexp matching beginning of defuns in Metafont or MetaPost mode."
 692   :type 'regexp
 693   :group 'meta-font)
 694
 695 (defcustom meta-end-defun-regexp
 696   (concat "\\(end\\(char\\|def\\|fig\\)\\)")
 697   "Regexp matching the end of defuns in Metafont or MetaPost mode."
 698   :type 'regexp
 699   :group 'meta-font)
 700
 701
 702 (defun meta-beginning-of-defun (&optional arg)
 703   "Move backward to beginning of a defun in Metafont or MetaPost code.
 704 With numeric argument, do it that many times.
 705 Negative arg -N means move forward to Nth following beginning of defun.
 706 Returns t unless search stops due to beginning or end of buffer."
 707   (interactive "p")
 708   (if (or (null arg) (= 0 arg)) (setq arg 1))
 709   (and arg (< arg 0) (not (eobp)) (forward-char 1))
 710   (and (re-search-backward
 711         (concat "\\<" meta-begin-defun-regexp "\\>") nil t arg)
 712        (progn (goto-char (match-beginning 0))
 713               (skip-chars-backward "%")
 714               (skip-chars-backward " \t\f") t)))
 715
 716 (defun meta-end-of-defun (&optional arg)
 717   "Move forward to end of a defun in Metafont or MetaPost code.
 718 With numeric argument, do it that many times.
 719 Negative argument -N means move back to Nth preceding end of defun.
 720 Returns t unless search stops due to beginning or end of buffer."
 721   (interactive "p")
 722   (if (or (null arg) (= 0 arg)) (setq arg 1))
 723   (and (< arg 0) (not (bobp)) (forward-line -1))
 724   (and (re-search-forward
 725         (concat "\\<" meta-end-defun-regexp "\\>") nil t arg)
 726        (progn (goto-char (match-end 0))
 727               (skip-chars-forward ";")
 728               (skip-chars-forward " \t\f")
 729               (if (looking-at "\n") (forward-line 1)) t)))
 730
 731
 732 (defun meta-comment-region (beg end &optional arg)
 733   "Comment out active region as Metafont or MetaPost source."
 734   (interactive "r")
 735   (comment-region beg end arg))
 736
 737 (defun meta-uncomment-region (beg end)
 738   "Uncomment active region as Metafont or MetaPost source."
 739   (interactive "r")
 740   (comment-region beg end -1))
 741
 742 (defun meta-comment-defun (&optional arg)
 743   "Comment out current environment as Metafont or MetaPost source.
 744 With prefix argument, uncomment the environment.
 745 The environment used is the one that contains point or follows point."
 746   (interactive "P")
 747   (save-excursion
 748     (let* ((end (if (meta-end-of-defun) (point) (point-max)))
 749            (beg (if (meta-beginning-of-defun) (point) (point-min))))
 750       (comment-region beg end arg))))
 751
 752 (defun meta-uncomment-defun ()
 753   "Uncomment current environment as Metafont or MetaPost source."
 754   (interactive)
 755   (meta-comment-defun -1))
 756
 757
 758 (defun meta-indent-region (beg end)
 759   "Indent the active region as Metafont or MetaPost source."
 760   (interactive "r")
 761   (indent-region beg end nil))
 762
 763 (defun meta-indent-buffer ()
 764   "Indent the whole buffer contents as Metafont or MetaPost source."
 765   (interactive)
 766   (save-excursion
 767     (indent-region (point-min) (point-max) nil)))
 768
 769 (defun meta-indent-defun ()
 770   "Indent the current environment as Metafont or MetaPost source.
 771 The environment indented is the one that contains point or follows point."
 772   (interactive)
 773   (save-excursion
 774     (let* ((end (if (meta-end-of-defun) (point) (point-max)))
 775            (beg (if (meta-beginning-of-defun) (point) (point-min))))
 776       (indent-region beg end nil))))
 777
 778
 779 (defun meta-mark-defun ()
 780   "Put mark at end of the environment, point at the beginning.
 781 The environment marked is the one that contains point or follows point."
 782   (interactive)
 783   (push-mark (point))
 784   (meta-end-of-defun)
 785   (push-mark (point) nil t)
 786   (meta-beginning-of-defun))
 787
 788
 789 \f
 790 ;;; Syntax table, keymap and menu.
 791
 792 (define-abbrev-table 'meta-mode-abbrev-table ()
 793   "Abbrev table used in Metafont or MetaPost mode.")
 794
 795 (defvar meta-common-mode-syntax-table
 796   (let ((st (make-syntax-table)))
 797     ;; FIXME: This goes against the convention!
 798     ;; underscores are word constituents
 799     (modify-syntax-entry ?_  "w"  st)
 800     ;; miscellaneous non-word symbols
 801     (modify-syntax-entry ?#  "_"  st)
 802     (modify-syntax-entry ?@  "_"  st)
 803     (modify-syntax-entry ?$  "_"  st)
 804     (modify-syntax-entry ??  "_"  st)
 805     (modify-syntax-entry ?!  "_"  st)
 806     ;; binary operators
 807     (modify-syntax-entry ?&  "."  st)
 808     (modify-syntax-entry ?+  "."  st)
 809     (modify-syntax-entry ?-  "."  st)
 810     (modify-syntax-entry ?/  "."  st)
 811     (modify-syntax-entry ?*  "."  st)
 812     (modify-syntax-entry ?.  "."  st)
 813     (modify-syntax-entry ?:  "."  st)
 814     (modify-syntax-entry ?=  "."  st)
 815     (modify-syntax-entry ?<  "."  st)
 816     (modify-syntax-entry ?>  "."  st)
 817     (modify-syntax-entry ?|  "."  st)
 818     ;; opening and closing delimiters
 819     (modify-syntax-entry ?\( "()" st)
 820     (modify-syntax-entry ?\) ")(" st)
 821     (modify-syntax-entry ?\[ "(]" st)
 822     (modify-syntax-entry ?\] ")[" st)
 823     (modify-syntax-entry ?\{ "(}" st)
 824     (modify-syntax-entry ?\} "){" st)
 825     ;; comment character
 826     (modify-syntax-entry ?%  "<"  st)
 827     (modify-syntax-entry ?\n ">"  st)
 828     ;; escape character, needed for embedded TeX code
 829     (modify-syntax-entry ?\\ "\\" st)
 830     st)
 831   "Syntax table used in Metafont or MetaPost mode.")
 832
 833 (define-obsolete-variable-alias 'meta-mode-map 'meta-common-mode-map "24.1")
 834 (defvar meta-common-mode-map
 835   (let ((map (make-sparse-keymap)))
 836     ;; Comment Paragraphs:
 837     ;; (define-key map "\M-a"      'backward-sentence)
 838     ;; (define-key map "\M-e"      'forward-sentence)
 839     ;; (define-key map "\M-h"      'mark-paragraph)
 840     ;; (define-key map "\M-q"      'fill-paragraph)
 841     ;; Navigation:
 842     (define-key map "\M-\C-a"   'meta-beginning-of-defun)
 843     (define-key map "\M-\C-e"   'meta-end-of-defun)
 844     (define-key map "\M-\C-h"   'meta-mark-defun)
 845     ;; Indentation:
 846     (define-key map "\M-\C-q"   'meta-indent-defun)
 847     (define-key map "\C-c\C-qe" 'meta-indent-defun)
 848     (define-key map "\C-c\C-qr" 'meta-indent-region)
 849     (define-key map "\C-c\C-qb" 'meta-indent-buffer)
 850     ;; Commenting Out:
 851     (define-key map "\C-c%"     'meta-comment-defun)
 852     ;; (define-key map "\C-uC-c%"  'meta-uncomment-defun)
 853     (define-key map "\C-c;"     'meta-comment-region)
 854     (define-key map "\C-c:"     'meta-uncomment-region)
 855     ;; Symbol Completion:
 856     (define-key map "\M-\t"     'completion-at-point)
 857     ;; Shell Commands:
 858     ;; (define-key map "\C-c\C-c"  'meta-command-file)
 859     ;; (define-key map "\C-c\C-k"  'meta-kill-job)
 860     ;; (define-key map "\C-c\C-l"  'meta-recenter-output)
 861     map)
 862   "Keymap used in Metafont or MetaPost mode.")
 863
 864 (easy-menu-define
 865  meta-mode-menu meta-common-mode-map
 866  "Menu used in Metafont or MetaPost mode."
 867  (list "Meta"
 868        ["Forward Environment"           meta-beginning-of-defun t]
 869        ["Backward Environment"          meta-end-of-defun t]
 870        "--"
 871        ["Indent Line"                   meta-indent-line t]
 872        ["Indent Environment"            meta-indent-defun t]
 873        ["Indent Region"                 meta-indent-region
 874         :active (meta-mark-active)]
 875        ["Indent Buffer"                 meta-indent-buffer t]
 876        "--"
 877        ["Comment Out Environment"       meta-comment-defun t]
 878        ["Uncomment Environment"         meta-uncomment-defun t]
 879        ["Comment Out Region"            meta-comment-region
 880         :active (meta-mark-active)]
 881        ["Uncomment Region"              meta-uncomment-region
 882         :active (meta-mark-active)]
 883        "--"
 884        ["Complete Symbol"               completion-at-point t]
 885 ;      "--"
 886 ;      ["Command on Buffer"             meta-command-file t]
 887 ;      ["Kill Job"                      meta-kill-job t]
 888 ;      ["Recenter Output Buffer"        meta-recenter-output-buffer t]
 889        ))
 890
 891 ;; Compatibility: XEmacs doesn't have the  `mark-active' variable.
 892 (defun meta-mark-active ()
 893   "Return whether the mark and region are currently active in this buffer."
 894   (if (boundp 'mark-active) mark-active (mark)))
 895
 896
 897 \f
 898 ;;; Hook variables.
 899
 900 (defcustom meta-mode-load-hook nil
 901   "Hook evaluated when first loading Metafont or MetaPost mode."
 902   :type 'hook
 903   :group 'meta-font)
 904
 905 (defcustom meta-common-mode-hook nil
 906   "Hook evaluated by both `metafont-mode' and `metapost-mode'."
 907   :type 'hook
 908   :group 'meta-font)
 909
 910 (defcustom metafont-mode-hook nil
 911   "Hook evaluated by `metafont-mode' after `meta-common-mode-hook'."
 912   :type 'hook
 913   :group 'meta-font)
 914 (defcustom metapost-mode-hook nil
 915   "Hook evaluated by `metapost-mode' after `meta-common-mode-hook'."
 916   :type 'hook
 917   :group 'meta-font)
 918
 919
 920 \f
 921 ;;; Initialization.
 922
 923 (define-derived-mode meta-common-mode prog-mode "-Meta-common-"
 924   "Common initialization for Metafont or MetaPost mode."
 925   :abbrev-table meta-mode-abbrev-table
 926   (set (make-local-variable 'paragraph-start)
 927        (concat page-delimiter "\\|$"))
 928   (set (make-local-variable 'paragraph-separate)
 929        (concat page-delimiter "\\|$"))
 930
 931   (set (make-local-variable 'paragraph-ignore-fill-prefix) t)
 932
 933   (set (make-local-variable 'comment-start-skip) "%+[ \t\f]*")
 934   (set (make-local-variable 'comment-start) "%")
 935   (set (make-local-variable 'comment-end) "")
 936   (set (make-local-variable 'comment-multi-line) nil)
 937
 938   ;; We use `back-to-indentation' but \f is no indentation sign.
 939   (modify-syntax-entry ?\f "_   ")
 940
 941   (set (make-local-variable 'parse-sexp-ignore-comments) t)
 942
 943   (add-hook 'completion-at-point-functions #'meta-completions-at-point nil t)
 944   (set (make-local-variable 'comment-indent-function) #'meta-comment-indent)
 945   (set (make-local-variable 'indent-line-function) #'meta-indent-line)
 946   ;; No need to define a mode-specific 'indent-region-function.
 947   ;; Simply use the generic 'indent-region and 'comment-region.
 948
 949   ;; Set defaults for font-lock mode.
 950   (set (make-local-variable 'font-lock-defaults)
 951        '(meta-font-lock-keywords
 952          nil nil ((?_ . "w")) nil
 953          (font-lock-comment-start-regexp . "%")))
 954
 955   ;; Activate syntax table, keymap and menu.
 956   (easy-menu-add meta-mode-menu))
 957
 958
 959 ;;;###autoload
 960 (define-derived-mode metafont-mode meta-common-mode "Metafont"
 961   "Major mode for editing Metafont sources."
 962   ;; Set defaults for completion function.
 963   (set (make-local-variable 'meta-symbol-list) nil)
 964   (set (make-local-variable 'meta-symbol-changed) nil)
 965   (apply 'meta-add-symbols metafont-symbol-list)
 966   (set (make-local-variable 'meta-complete-list)
 967         (list (list "\\<\\(\\sw+\\)" 1 'meta-symbol-list)
 968               (list "" 'ispell-complete-word))))
 969
 970 ;;;###autoload
 971 (define-derived-mode metapost-mode meta-common-mode "MetaPost"
 972   "Major mode for editing MetaPost sources."
 973   ;; Set defaults for completion function.
 974   (set (make-local-variable 'meta-symbol-list) nil)
 975   (set (make-local-variable 'meta-symbol-changed) nil)
 976   (apply 'meta-add-symbols metapost-symbol-list)
 977   (set (make-local-variable 'meta-complete-list)
 978         (list (list "\\<\\(\\sw+\\)" 1 'meta-symbol-list)
 979               (list "" 'ispell-complete-word))))
 980
 981
 982 ;;; Just in case ...
 983
 984 (provide 'meta-mode)
 985 (run-hooks 'meta-mode-load-hook)
 986
 987 ;;; meta-mode.el ends here