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annotate src/elisp/urweb-mode.el @ 350:3a1e36b14105

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First sort-of-working run of urweb-mode
author Adam Chlipala <adamc@hcoop.net>
date Sun, 12 Oct 2008 10:04:17 -0400
parents
children d5148178a7be
rev   line source
adamc@350 1 ;;; urweb-mode.el --- Major mode for editing (Standard) ML
adamc@350 2
adamc@350 3 ;; Based on sml-mode:
adamc@350 4 ;; Copyright (C) 1999,2000,2004 Stefan Monnier
adamc@350 5 ;; Copyright (C) 1994-1997 Matthew J. Morley
adamc@350 6 ;; Copyright (C) 1989 Lars Bo Nielsen
adamc@350 7 ;;
adamc@350 8 ;; Modified for urweb-mode:
adamc@350 9 ;; Copyright (C) 2008 Adam Chlipala <adamc@hcoop.net>
adamc@350 10
adamc@350 11 ;; Author: Lars Bo Nielsen
adamc@350 12 ;; Olin Shivers
adamc@350 13 ;; Fritz Knabe (?)
adamc@350 14 ;; Steven Gilmore (?)
adamc@350 15 ;; Matthew Morley <mjm@scs.leeds.ac.uk> (aka <matthew@verisity.com>)
adamc@350 16 ;; Matthias Blume <blume@cs.princeton.edu> (aka <blume@kurims.kyoto-u.ac.jp>)
adamc@350 17 ;; (Stefan Monnier) monnier@cs.yale.edu
adamc@350 18 ;; Adam Chlipala
adamc@350 19
adamc@350 20 ;; This file is not part of GNU Emacs, but it is distributed under the
adamc@350 21 ;; same conditions.
adamc@350 22
adamc@350 23 ;; This program is free software; you can redistribute it and/or
adamc@350 24 ;; modify it under the terms of the GNU General Public License as
adamc@350 25 ;; published by the Free Software Foundation; either version 2, or (at
adamc@350 26 ;; your option) any later version.
adamc@350 27
adamc@350 28 ;; This program is distributed in the hope that it will be useful, but
adamc@350 29 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
adamc@350 30 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
adamc@350 31 ;; General Public License for more details.
adamc@350 32
adamc@350 33 ;; You should have received a copy of the GNU General Public License
adamc@350 34 ;; along with GNU Emacs; see the file COPYING. If not, write to the
adamc@350 35 ;; Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
adamc@350 36
adamc@350 37 ;;; Commentary:
adamc@350 38
adamc@350 39 ;;; HISTORY
adamc@350 40
adamc@350 41 ;; Still under construction: History obscure, needs a biographer as
adamc@350 42 ;; well as a M-x doctor. Change Log on request.
adamc@350 43
adamc@350 44 ;; Hacked by Olin Shivers for comint from Lars Bo Nielsen's urweb.el.
adamc@350 45
adamc@350 46 ;; Hacked by Matthew Morley to incorporate Fritz Knabe's hilite and
adamc@350 47 ;; font-lock patterns, some of Steven Gilmore's (reduced) easy-menus,
adamc@350 48 ;; and numerous bugs and bug-fixes.
adamc@350 49
adamc@350 50 ;;; DESCRIPTION
adamc@350 51
adamc@350 52 ;; See accompanying info file: urweb-mode.info
adamc@350 53
adamc@350 54 ;;; FOR YOUR .EMACS FILE
adamc@350 55
adamc@350 56 ;; If urweb-mode.el lives in some non-standard directory, you must tell
adamc@350 57 ;; emacs where to get it. This may or may not be necessary:
adamc@350 58
adamc@350 59 ;; (add-to-list 'load-path "~jones/lib/emacs/")
adamc@350 60
adamc@350 61 ;; Then to access the commands autoload urweb-mode with that command:
adamc@350 62
adamc@350 63 ;; (load "urweb-mode-startup")
adamc@350 64
adamc@350 65 ;; urweb-mode-hook is run whenever a new urweb-mode buffer is created.
adamc@350 66
adamc@350 67 ;;; Code:
adamc@350 68
adamc@350 69 (eval-when-compile (require 'cl))
adamc@350 70 (require 'urweb-util)
adamc@350 71 (require 'urweb-move)
adamc@350 72 (require 'urweb-defs)
adamc@350 73 (condition-case nil (require 'skeleton) (error nil))
adamc@350 74
adamc@350 75 ;;; VARIABLES CONTROLLING INDENTATION
adamc@350 76
adamc@350 77 (defcustom urweb-indent-level 4
adamc@350 78 "*Indentation of blocks in Ur/Web (see also `urweb-structure-indent')."
adamc@350 79 :group 'urweb
adamc@350 80 :type '(integer))
adamc@350 81
adamc@350 82 (defcustom urweb-indent-args urweb-indent-level
adamc@350 83 "*Indentation of args placed on a separate line."
adamc@350 84 :group 'urweb
adamc@350 85 :type '(integer))
adamc@350 86
adamc@350 87 (defcustom urweb-electric-semi-mode nil
adamc@350 88 "*If non-nil, `\;' will self insert, reindent the line, and do a newline.
adamc@350 89 If nil, just insert a `\;'. (To insert while t, do: \\[quoted-insert] \;)."
adamc@350 90 :group 'urweb
adamc@350 91 :type 'boolean)
adamc@350 92
adamc@350 93 (defcustom urweb-rightalign-and t
adamc@350 94 "If non-nil, right-align `and' with its leader.
adamc@350 95 If nil: If t:
adamc@350 96 datatype a = A datatype a = A
adamc@350 97 and b = B and b = B"
adamc@350 98 :group 'urweb
adamc@350 99 :type 'boolean)
adamc@350 100
adamc@350 101 ;;; OTHER GENERIC MODE VARIABLES
adamc@350 102
adamc@350 103 (defvar urweb-mode-info "urweb-mode"
adamc@350 104 "*Where to find Info file for `urweb-mode'.
adamc@350 105 The default assumes the info file \"urweb-mode.info\" is on Emacs' info
adamc@350 106 directory path. If it is not, either put the file on the standard path
adamc@350 107 or set the variable `urweb-mode-info' to the exact location of this file
adamc@350 108
adamc@350 109 (setq urweb-mode-info \"/usr/me/lib/info/urweb-mode\")
adamc@350 110
adamc@350 111 in your .emacs file. You can always set it interactively with the
adamc@350 112 set-variable command.")
adamc@350 113
adamc@350 114 (defvar urweb-mode-hook nil
adamc@350 115 "*Run upon entering `urweb-mode'.
adamc@350 116 This is a good place to put your preferred key bindings.")
adamc@350 117
adamc@350 118 ;;; CODE FOR Ur/Web-MODE
adamc@350 119
adamc@350 120 (defun urweb-mode-info ()
adamc@350 121 "Command to access the TeXinfo documentation for `urweb-mode'.
adamc@350 122 See doc for the variable `urweb-mode-info'."
adamc@350 123 (interactive)
adamc@350 124 (require 'info)
adamc@350 125 (condition-case nil
adamc@350 126 (info urweb-mode-info)
adamc@350 127 (error (progn
adamc@350 128 (describe-variable 'urweb-mode-info)
adamc@350 129 (message "Can't find it... set this variable first!")))))
adamc@350 130
adamc@350 131
adamc@350 132 ;; font-lock setup
adamc@350 133
adamc@350 134 (defconst urweb-keywords-regexp
adamc@350 135 (urweb-syms-re "and" "case" "class" "con" "constraint" "constraints"
adamc@350 136 "datatype" "else" "end" "extern" "fn" "fold"
adamc@350 137 "fun" "functor" "if" "include"
adamc@350 138 "of" "open"
adamc@350 139 "rec" "sequence" "sig" "signature"
adamc@350 140 "struct" "structure" "table" "then" "type" "val" "where"
adamc@350 141 "with"
adamc@350 142
adamc@350 143 "Name" "Type" "Unit")
adamc@350 144 "A regexp that matches any non-SQL keywords of Ur/Web.")
adamc@350 145
adamc@350 146 (defconst urweb-sql-keywords-regexp
adamc@350 147 (urweb-syms-re "SELECT" "FROM" "AS" "WHERE" "SQL" "GROUP" "ORDER" "BY"
adamc@350 148 "HAVING" "LIMIT" "OFFSET" "ALL" "UNION" "INTERSECT" "EXCEPT"
adamc@350 149 "TRUE" "FALSE" "AND" "OR" "NOT" "COUNT" "AVG" "SUM" "MIN" "MAX"
adamc@350 150 "ASC" "DESC" "INSERT" "INTO" "VALUES" "UPDATE" "SET" "DELETE")
adamc@350 151 "A regexp that matches SQL keywords.")
adamc@350 152
adamc@350 153 ;;; Font-lock settings ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
adamc@350 154
adamc@350 155 ;; The font lock regular expressions.
adamc@350 156
adamc@350 157 (defconst urweb-font-lock-keywords
adamc@350 158 `(;;(urweb-font-comments-and-strings)
adamc@350 159 (,(concat "\\<\\(fun\\|and\\)\\s-+\\(\\sw+\\)\\s-+[^ \t\n=]")
adamc@350 160 (1 font-lock-keyword-face)
adamc@350 161 (6 font-lock-function-name-face))
adamc@350 162 (,(concat "\\<\\(\\(data\\)?type\\|con\\)\\s-+\\(\\sw+\\)")
adamc@350 163 (1 font-lock-keyword-face)
adamc@350 164 (7 font-lock-type-def-face))
adamc@350 165 ("\\<\\(val\\)\\s-+\\(\\sw+\\>\\s-*\\)?\\(\\sw+\\)\\s-*[=:]"
adamc@350 166 (1 font-lock-keyword-face)
adamc@350 167 (3 font-lock-variable-name-face))
adamc@350 168 ("\\<\\(structure\\|functor\\)\\s-+\\(\\sw+\\)"
adamc@350 169 (1 font-lock-keyword-face)
adamc@350 170 (2 font-lock-module-def-face))
adamc@350 171 ("\\<\\(signature\\)\\s-+\\(\\sw+\\)"
adamc@350 172 (1 font-lock-keyword-face)
adamc@350 173 (2 font-lock-interface-def-face))
adamc@350 174
adamc@350 175 (,urweb-keywords-regexp . font-lock-keyword-face)
adamc@350 176 (,urweb-sql-keywords-regexp . font-lock-sql-face))
adamc@350 177 "Regexps matching standard Ur/Web keywords.")
adamc@350 178
adamc@350 179 (defface font-lock-type-def-face
adamc@350 180 '((t (:bold t)))
adamc@350 181 "Font Lock mode face used to highlight type definitions."
adamc@350 182 :group 'font-lock-highlighting-faces)
adamc@350 183 (defvar font-lock-type-def-face 'font-lock-type-def-face
adamc@350 184 "Face name to use for type definitions.")
adamc@350 185
adamc@350 186 (defface font-lock-module-def-face
adamc@350 187 '((t (:bold t)))
adamc@350 188 "Font Lock mode face used to highlight module definitions."
adamc@350 189 :group 'font-lock-highlighting-faces)
adamc@350 190 (defvar font-lock-module-def-face 'font-lock-module-def-face
adamc@350 191 "Face name to use for module definitions.")
adamc@350 192
adamc@350 193 (defface font-lock-interface-def-face
adamc@350 194 '((t (:bold t)))
adamc@350 195 "Font Lock mode face used to highlight interface definitions."
adamc@350 196 :group 'font-lock-highlighting-faces)
adamc@350 197 (defvar font-lock-interface-def-face 'font-lock-interface-def-face
adamc@350 198 "Face name to use for interface definitions.")
adamc@350 199
adamc@350 200 (defface font-lock-sql-face
adamc@350 201 '((t (:bold t)))
adamc@350 202 "Font Lock mode face used to highlight SQL keywords."
adamc@350 203 :group 'font-lock-highlighting-faces)
adamc@350 204 (defvar font-lock-sql-face 'font-lock-sql-face
adamc@350 205 "Face name to use for SQL keywords.")
adamc@350 206
adamc@350 207 ;;
adamc@350 208 ;; Code to handle nested comments and unusual string escape sequences
adamc@350 209 ;;
adamc@350 210
adamc@350 211 (defsyntax urweb-syntax-prop-table
adamc@350 212 '((?\\ . ".") (?* . "."))
adamc@350 213 "Syntax table for text-properties")
adamc@350 214
adamc@350 215 ;; For Emacsen that have no built-in support for nested comments
adamc@350 216 (defun urweb-get-depth-st ()
adamc@350 217 (save-excursion
adamc@350 218 (let* ((disp (if (eq (char-before) ?\)) (progn (backward-char) -1) nil))
adamc@350 219 (_ (backward-char))
adamc@350 220 (disp (if (eq (char-before) ?\() (progn (backward-char) 0) disp))
adamc@350 221 (pt (point)))
adamc@350 222 (when disp
adamc@350 223 (let* ((depth
adamc@350 224 (save-match-data
adamc@350 225 (if (re-search-backward "\\*)\\|(\\*" nil t)
adamc@350 226 (+ (or (get-char-property (point) 'comment-depth) 0)
adamc@350 227 (case (char-after) (?\( 1) (?* 0))
adamc@350 228 disp)
adamc@350 229 0)))
adamc@350 230 (depth (if (> depth 0) depth)))
adamc@350 231 (put-text-property pt (1+ pt) 'comment-depth depth)
adamc@350 232 (when depth urweb-syntax-prop-table))))))
adamc@350 233
adamc@350 234 (defconst urweb-font-lock-syntactic-keywords
adamc@350 235 `(("^\\s-*\\(\\\\\\)" (1 ',urweb-syntax-prop-table))
adamc@350 236 ,@(unless urweb-builtin-nested-comments-flag
adamc@350 237 '(("(?\\(\\*\\))?" (1 (urweb-get-depth-st)))))))
adamc@350 238
adamc@350 239 (defconst urweb-font-lock-defaults
adamc@350 240 '(urweb-font-lock-keywords nil nil ((?_ . "w") (?' . "w")) nil
adamc@350 241 (font-lock-syntactic-keywords . urweb-font-lock-syntactic-keywords)))
adamc@350 242
adamc@350 243 ;;;;
adamc@350 244 ;;;; Imenu support
adamc@350 245 ;;;;
adamc@350 246
adamc@350 247 (defvar urweb-imenu-regexp
adamc@350 248 (concat "^[ \t]*\\(let[ \t]+\\)?"
adamc@350 249 (regexp-opt (append urweb-module-head-syms
adamc@350 250 '("and" "fun" "datatype" "type")) t)
adamc@350 251 "\\>"))
adamc@350 252
adamc@350 253 (defun urweb-imenu-create-index ()
adamc@350 254 (let (alist)
adamc@350 255 (goto-char (point-max))
adamc@350 256 (while (re-search-backward urweb-imenu-regexp nil t)
adamc@350 257 (save-excursion
adamc@350 258 (let ((kind (match-string 2))
adamc@350 259 (column (progn (goto-char (match-beginning 2)) (current-column)))
adamc@350 260 (location
adamc@350 261 (progn (goto-char (match-end 0))
adamc@350 262 (urweb-forward-spaces)
adamc@350 263 (when (looking-at urweb-tyvarseq-re)
adamc@350 264 (goto-char (match-end 0)))
adamc@350 265 (point)))
adamc@350 266 (name (urweb-forward-sym)))
adamc@350 267 ;; Eliminate trivial renamings.
adamc@350 268 (when (or (not (member kind '("structure" "signature")))
adamc@350 269 (progn (search-forward "=")
adamc@350 270 (urweb-forward-spaces)
adamc@350 271 (looking-at "sig\\|struct")))
adamc@350 272 (push (cons (concat (make-string (/ column 2) ?\ ) name) location)
adamc@350 273 alist)))))
adamc@350 274 alist))
adamc@350 275
adamc@350 276 ;;; MORE CODE FOR URWEB-MODE
adamc@350 277
adamc@350 278 ;;;###autoload (add-to-list 'load-path (file-name-directory load-file-name))
adamc@350 279 ;;;###autoload
adamc@350 280 (add-to-list 'auto-mode-alist '("\\.s\\(ml\\|ig\\)\\'" . urweb-mode))
adamc@350 281
adamc@350 282 ;;;###autoload
adamc@350 283 (define-derived-mode urweb-mode fundamental-mode "Ur/Web"
adamc@350 284 "\\<urweb-mode-map>Major mode for editing Ur/Web code.
adamc@350 285 This mode runs `urweb-mode-hook' just before exiting.
adamc@350 286 \\{urweb-mode-map}"
adamc@350 287 (set (make-local-variable 'font-lock-defaults) urweb-font-lock-defaults)
adamc@350 288 (set (make-local-variable 'outline-regexp) urweb-outline-regexp)
adamc@350 289 (set (make-local-variable 'imenu-create-index-function)
adamc@350 290 'urweb-imenu-create-index)
adamc@350 291 (set (make-local-variable 'add-log-current-defun-function)
adamc@350 292 'urweb-current-fun-name)
adamc@350 293 ;; Treat paragraph-separators in comments as paragraph-separators.
adamc@350 294 (set (make-local-variable 'paragraph-separate)
adamc@350 295 (concat "\\([ \t]*\\*)?\\)?\\(" paragraph-separate "\\)"))
adamc@350 296 (set (make-local-variable 'require-final-newline) t)
adamc@350 297 ;; forward-sexp-function is an experimental variable in my hacked Emacs.
adamc@350 298 (set (make-local-variable 'forward-sexp-function) 'urweb-user-forward-sexp)
adamc@350 299 ;; For XEmacs
adamc@350 300 (easy-menu-add urweb-mode-menu)
adamc@350 301 ;; Compatibility. FIXME: we should use `-' in Emacs-CVS.
adamc@350 302 (unless (boundp 'skeleton-positions) (set (make-local-variable '@) nil))
adamc@350 303 (urweb-mode-variables))
adamc@350 304
adamc@350 305 (defun urweb-mode-variables ()
adamc@350 306 (set-syntax-table urweb-mode-syntax-table)
adamc@350 307 (setq local-abbrev-table urweb-mode-abbrev-table)
adamc@350 308 ;; A paragraph is separated by blank lines or ^L only.
adamc@350 309
adamc@350 310 (set (make-local-variable 'indent-line-function) 'urweb-indent-line)
adamc@350 311 (set (make-local-variable 'comment-start) "(* ")
adamc@350 312 (set (make-local-variable 'comment-end) " *)")
adamc@350 313 (set (make-local-variable 'comment-nested) t)
adamc@350 314 ;;(set (make-local-variable 'block-comment-start) "* ")
adamc@350 315 ;;(set (make-local-variable 'block-comment-end) "")
adamc@350 316 ;; (set (make-local-variable 'comment-column) 40)
adamc@350 317 (set (make-local-variable 'comment-start-skip) "(\\*+\\s-*"))
adamc@350 318
adamc@350 319 (defun urweb-funname-of-and ()
adamc@350 320 "Name of the function this `and' defines, or nil if not a function.
adamc@350 321 Point has to be right after the `and' symbol and is not preserved."
adamc@350 322 (urweb-forward-spaces)
adamc@350 323 (if (looking-at urweb-tyvarseq-re) (goto-char (match-end 0)))
adamc@350 324 (let ((sym (urweb-forward-sym)))
adamc@350 325 (urweb-forward-spaces)
adamc@350 326 (unless (or (member sym '(nil "d="))
adamc@350 327 (member (urweb-forward-sym) '("d=")))
adamc@350 328 sym)))
adamc@350 329
adamc@350 330 ;;; INDENTATION !!!
adamc@350 331
adamc@350 332 (defun urweb-mark-function ()
adamc@350 333 "Synonym for `mark-paragraph' -- sorry.
adamc@350 334 If anyone has a good algorithm for this..."
adamc@350 335 (interactive)
adamc@350 336 (mark-paragraph))
adamc@350 337
adamc@350 338 (defun urweb-indent-line ()
adamc@350 339 "Indent current line of Ur/Web code."
adamc@350 340 (interactive)
adamc@350 341 (let ((savep (> (current-column) (current-indentation)))
adamc@350 342 (indent (max (or (ignore-errors (urweb-calculate-indentation)) 0) 0)))
adamc@350 343 (if savep
adamc@350 344 (save-excursion (indent-line-to indent))
adamc@350 345 (indent-line-to indent))))
adamc@350 346
adamc@350 347 (defun urweb-back-to-outer-indent ()
adamc@350 348 "Unindents to the next outer level of indentation."
adamc@350 349 (interactive)
adamc@350 350 (save-excursion
adamc@350 351 (beginning-of-line)
adamc@350 352 (skip-chars-forward "\t ")
adamc@350 353 (let ((start-column (current-column))
adamc@350 354 (indent (current-column)))
adamc@350 355 (if (> start-column 0)
adamc@350 356 (progn
adamc@350 357 (save-excursion
adamc@350 358 (while (>= indent start-column)
adamc@350 359 (if (re-search-backward "^[^\n]" nil t)
adamc@350 360 (setq indent (current-indentation))
adamc@350 361 (setq indent 0))))
adamc@350 362 (backward-delete-char-untabify (- start-column indent)))))))
adamc@350 363
adamc@350 364 (defun urweb-find-comment-indent ()
adamc@350 365 (save-excursion
adamc@350 366 (let ((depth 1))
adamc@350 367 (while (> depth 0)
adamc@350 368 (if (re-search-backward "(\\*\\|\\*)" nil t)
adamc@350 369 (cond
adamc@350 370 ;; FIXME: That's just a stop-gap.
adamc@350 371 ((eq (get-text-property (point) 'face) 'font-lock-string-face))
adamc@350 372 ((looking-at "*)") (incf depth))
adamc@350 373 ((looking-at comment-start-skip) (decf depth)))
adamc@350 374 (setq depth -1)))
adamc@350 375 (if (= depth 0)
adamc@350 376 (1+ (current-column))
adamc@350 377 nil))))
adamc@350 378
adamc@350 379 (defun urweb-calculate-indentation ()
adamc@350 380 (save-excursion
adamc@350 381 (beginning-of-line) (skip-chars-forward "\t ")
adamc@350 382 (urweb-with-ist
adamc@350 383 ;; Indentation for comments alone on a line, matches the
adamc@350 384 ;; proper indentation of the next line.
adamc@350 385 (when (looking-at "(\\*") (urweb-forward-spaces))
adamc@350 386 (let (data
adamc@350 387 (sym (save-excursion (urweb-forward-sym))))
adamc@350 388 (or
adamc@350 389 ;; Allow the user to override the indentation.
adamc@350 390 (when (looking-at (concat ".*" (regexp-quote comment-start)
adamc@350 391 "[ \t]*fixindent[ \t]*"
adamc@350 392 (regexp-quote comment-end)))
adamc@350 393 (current-indentation))
adamc@350 394
adamc@350 395 ;; Continued comment.
adamc@350 396 (and (looking-at "\\*") (urweb-find-comment-indent))
adamc@350 397
adamc@350 398 ;; Continued string ? (Added 890113 lbn)
adamc@350 399 (and (looking-at "\\\\")
adamc@350 400 (save-excursion
adamc@350 401 (if (save-excursion (previous-line 1)
adamc@350 402 (beginning-of-line)
adamc@350 403 (looking-at "[\t ]*\\\\"))
adamc@350 404 (progn (previous-line 1) (current-indentation))
adamc@350 405 (if (re-search-backward "[^\\\\]\"" nil t)
adamc@350 406 (1+ (current-column))
adamc@350 407 0))))
adamc@350 408
adamc@350 409 ;; Closing parens. Could be handled below with `urweb-indent-relative'?
adamc@350 410 (and (looking-at "\\s)")
adamc@350 411 (save-excursion
adamc@350 412 (skip-syntax-forward ")")
adamc@350 413 (backward-sexp 1)
adamc@350 414 (if (urweb-dangling-sym)
adamc@350 415 (urweb-indent-default 'noindent)
adamc@350 416 (current-column))))
adamc@350 417
adamc@350 418 (and (setq data (assoc sym urweb-close-paren))
adamc@350 419 (urweb-indent-relative sym data))
adamc@350 420
adamc@350 421 (and (member sym urweb-starters-syms)
adamc@350 422 (urweb-indent-starter sym))
adamc@350 423
adamc@350 424 (and (string= sym "|") (urweb-indent-pipe))
adamc@350 425
adamc@350 426 (urweb-indent-arg)
adamc@350 427 (urweb-indent-default))))))
adamc@350 428
adamc@350 429 (defsubst urweb-bolp ()
adamc@350 430 (save-excursion (skip-chars-backward " \t|") (bolp)))
adamc@350 431
adamc@350 432 (defun urweb-indent-starter (orig-sym)
adamc@350 433 "Return the indentation to use for a symbol in `urweb-starters-syms'.
adamc@350 434 Point should be just before the symbol ORIG-SYM and is not preserved."
adamc@350 435 (let ((sym (unless (save-excursion (urweb-backward-arg))
adamc@350 436 (urweb-backward-spaces)
adamc@350 437 (urweb-backward-sym))))
adamc@350 438 (if (member sym '(";" "d=")) (setq sym nil))
adamc@350 439 (if sym (urweb-get-sym-indent sym)
adamc@350 440 ;; FIXME: this can take a *long* time !!
adamc@350 441 (setq sym (urweb-find-matching-starter urweb-starters-syms))
adamc@350 442 ;; Don't align with `and' because it might be specially indented.
adamc@350 443 (if (and (or (equal orig-sym "and") (not (equal sym "and")))
adamc@350 444 (urweb-bolp))
adamc@350 445 (+ (current-column)
adamc@350 446 (if (and urweb-rightalign-and (equal orig-sym "and"))
adamc@350 447 (- (length sym) 3) 0))
adamc@350 448 (urweb-indent-starter orig-sym)))))
adamc@350 449
adamc@350 450 (defun urweb-indent-relative (sym data)
adamc@350 451 (save-excursion
adamc@350 452 (urweb-forward-sym) (urweb-backward-sexp nil)
adamc@350 453 (unless (second data) (urweb-backward-spaces) (urweb-backward-sym))
adamc@350 454 (+ (or (cdr (assoc sym urweb-symbol-indent)) 0)
adamc@350 455 (urweb-delegated-indent))))
adamc@350 456
adamc@350 457 (defun urweb-indent-pipe ()
adamc@350 458 (let ((sym (urweb-find-matching-starter urweb-pipeheads
adamc@350 459 (urweb-op-prec "|" 'back))))
adamc@350 460 (when sym
adamc@350 461 (if (string= sym "|")
adamc@350 462 (if (urweb-bolp) (current-column) (urweb-indent-pipe))
adamc@350 463 (let ((pipe-indent (or (cdr (assoc "|" urweb-symbol-indent)) -2)))
adamc@350 464 (when (or (member sym '("datatype"))
adamc@350 465 (and (equal sym "and")
adamc@350 466 (save-excursion
adamc@350 467 (forward-word 1)
adamc@350 468 (not (urweb-funname-of-and)))))
adamc@350 469 (re-search-forward "="))
adamc@350 470 (urweb-forward-sym)
adamc@350 471 (urweb-forward-spaces)
adamc@350 472 (+ pipe-indent (current-column)))))))
adamc@350 473
adamc@350 474 (defun urweb-find-forward (re)
adamc@350 475 (urweb-forward-spaces)
adamc@350 476 (while (and (not (looking-at re))
adamc@350 477 (progn
adamc@350 478 (or (ignore-errors (forward-sexp 1) t) (forward-char 1))
adamc@350 479 (urweb-forward-spaces)
adamc@350 480 (not (looking-at re))))))
adamc@350 481
adamc@350 482 (defun urweb-indent-arg ()
adamc@350 483 (and (save-excursion (ignore-errors (urweb-forward-arg)))
adamc@350 484 ;;(not (looking-at urweb-not-arg-re))
adamc@350 485 ;; looks like a function or an argument
adamc@350 486 (urweb-move-if (urweb-backward-arg))
adamc@350 487 ;; an argument
adamc@350 488 (if (save-excursion (not (urweb-backward-arg)))
adamc@350 489 ;; a first argument
adamc@350 490 (+ (current-column) urweb-indent-args)
adamc@350 491 ;; not a first arg
adamc@350 492 (while (and (/= (current-column) (current-indentation))
adamc@350 493 (urweb-move-if (urweb-backward-arg))))
adamc@350 494 (unless (save-excursion (urweb-backward-arg))
adamc@350 495 ;; all earlier args are on the same line
adamc@350 496 (urweb-forward-arg) (urweb-forward-spaces))
adamc@350 497 (current-column))))
adamc@350 498
adamc@350 499 (defun urweb-get-indent (data sym)
adamc@350 500 (let (d)
adamc@350 501 (cond
adamc@350 502 ((not (listp data)) data)
adamc@350 503 ((setq d (member sym data)) (cadr d))
adamc@350 504 ((and (consp data) (not (stringp (car data)))) (car data))
adamc@350 505 (t urweb-indent-level))))
adamc@350 506
adamc@350 507 (defun urweb-dangling-sym ()
adamc@350 508 "Non-nil if the symbol after point is dangling.
adamc@350 509 The symbol can be an Ur/Web symbol or an open-paren. \"Dangling\" means that
adamc@350 510 it is not on its own line but is the last element on that line."
adamc@350 511 (save-excursion
adamc@350 512 (and (not (urweb-bolp))
adamc@350 513 (< (urweb-point-after (end-of-line))
adamc@350 514 (urweb-point-after (or (urweb-forward-sym) (skip-syntax-forward "("))
adamc@350 515 (urweb-forward-spaces))))))
adamc@350 516
adamc@350 517 (defun urweb-delegated-indent ()
adamc@350 518 (if (urweb-dangling-sym)
adamc@350 519 (urweb-indent-default 'noindent)
adamc@350 520 (urweb-move-if (backward-word 1)
adamc@350 521 (looking-at urweb-agglomerate-re))
adamc@350 522 (current-column)))
adamc@350 523
adamc@350 524 (defun urweb-get-sym-indent (sym &optional style)
adamc@350 525 "Find the indentation for the SYM we're `looking-at'.
adamc@350 526 If indentation is delegated, point will move to the start of the parent.
adamc@350 527 Optional argument STYLE is currently ignored."
adamc@350 528 (assert (equal sym (save-excursion (urweb-forward-sym))))
adamc@350 529 (save-excursion
adamc@350 530 (let ((delegate (and (not (equal sym "end")) (assoc sym urweb-close-paren)))
adamc@350 531 (head-sym sym))
adamc@350 532 (when (and delegate (not (eval (third delegate))))
adamc@350 533 ;;(urweb-find-match-backward sym delegate)
adamc@350 534 (urweb-forward-sym) (urweb-backward-sexp nil)
adamc@350 535 (setq head-sym
adamc@350 536 (if (second delegate)
adamc@350 537 (save-excursion (urweb-forward-sym))
adamc@350 538 (urweb-backward-spaces) (urweb-backward-sym))))
adamc@350 539
adamc@350 540 (let ((idata (assoc head-sym urweb-indent-rule)))
adamc@350 541 (when idata
adamc@350 542 ;;(if (or style (not delegate))
adamc@350 543 ;; normal indentation
adamc@350 544 (let ((indent (urweb-get-indent (cdr idata) sym)))
adamc@350 545 (when indent (+ (urweb-delegated-indent) indent)))
adamc@350 546 ;; delgate indentation to the parent
adamc@350 547 ;;(urweb-forward-sym) (urweb-backward-sexp nil)
adamc@350 548 ;;(let* ((parent-sym (save-excursion (urweb-forward-sym)))
adamc@350 549 ;; (parent-indent (cdr (assoc parent-sym urweb-indent-starters))))
adamc@350 550 ;; check the special rules
adamc@350 551 ;;(+ (urweb-delegated-indent)
adamc@350 552 ;; (or (urweb-get-indent (cdr indent-data) 1 'strict)
adamc@350 553 ;; (urweb-get-indent (cdr parent-indent) 1 'strict)
adamc@350 554 ;; (urweb-get-indent (cdr indent-data) 0)
adamc@350 555 ;; (urweb-get-indent (cdr parent-indent) 0))))))))
adamc@350 556 )))))
adamc@350 557
adamc@350 558 (defun urweb-indent-default (&optional noindent)
adamc@350 559 (let* ((sym-after (save-excursion (urweb-forward-sym)))
adamc@350 560 (_ (urweb-backward-spaces))
adamc@350 561 (sym-before (urweb-backward-sym))
adamc@350 562 (sym-indent (and sym-before (urweb-get-sym-indent sym-before)))
adamc@350 563 (indent-after (or (cdr (assoc sym-after urweb-symbol-indent)) 0)))
adamc@350 564 (when (equal sym-before "end")
adamc@350 565 ;; I don't understand what's really happening here, but when
adamc@350 566 ;; it's `end' clearly, we need to do something special.
adamc@350 567 (forward-word 1)
adamc@350 568 (setq sym-before nil sym-indent nil))
adamc@350 569 (cond
adamc@350 570 (sym-indent
adamc@350 571 ;; the previous sym is an indentation introducer: follow the rule
adamc@350 572 (if noindent
adamc@350 573 ;;(current-column)
adamc@350 574 sym-indent
adamc@350 575 (+ sym-indent indent-after)))
adamc@350 576 ;; If we're just after a hanging open paren.
adamc@350 577 ((and (eq (char-syntax (preceding-char)) ?\()
adamc@350 578 (save-excursion (backward-char) (urweb-dangling-sym)))
adamc@350 579 (backward-char)
adamc@350 580 (urweb-indent-default))
adamc@350 581 (t
adamc@350 582 ;; default-default
adamc@350 583 (let* ((prec-after (urweb-op-prec sym-after 'back))
adamc@350 584 (prec (or (urweb-op-prec sym-before 'back) prec-after 100)))
adamc@350 585 ;; go back until you hit a symbol that has a lower prec than the
adamc@350 586 ;; "current one", or until you backed over a sym that has the same prec
adamc@350 587 ;; but is at the beginning of a line.
adamc@350 588 (while (and (not (urweb-bolp))
adamc@350 589 (while (urweb-move-if (urweb-backward-sexp (1- prec))))
adamc@350 590 (not (urweb-bolp)))
adamc@350 591 (while (urweb-move-if (urweb-backward-sexp prec))))
adamc@350 592 (if noindent
adamc@350 593 ;; the `noindent' case does back over an introductory symbol
adamc@350 594 ;; such as `fun', ...
adamc@350 595 (progn
adamc@350 596 (urweb-move-if
adamc@350 597 (urweb-backward-spaces)
adamc@350 598 (member (urweb-backward-sym) urweb-starters-syms))
adamc@350 599 (current-column))
adamc@350 600 ;; Use `indent-after' for cases such as when , or ; should be
adamc@350 601 ;; outdented so that their following terms are aligned.
adamc@350 602 (+ (if (progn
adamc@350 603 (if (equal sym-after ";")
adamc@350 604 (urweb-move-if
adamc@350 605 (urweb-backward-spaces)
adamc@350 606 (member (urweb-backward-sym) urweb-starters-syms)))
adamc@350 607 (and sym-after (not (looking-at sym-after))))
adamc@350 608 indent-after 0)
adamc@350 609 (current-column))))))))
adamc@350 610
adamc@350 611
adamc@350 612 ;; maybe `|' should be set to word-syntax in our temp syntax table ?
adamc@350 613 (defun urweb-current-indentation ()
adamc@350 614 (save-excursion
adamc@350 615 (beginning-of-line)
adamc@350 616 (skip-chars-forward " \t|")
adamc@350 617 (current-column)))
adamc@350 618
adamc@350 619
adamc@350 620 (defun urweb-find-matching-starter (syms &optional prec)
adamc@350 621 (let (sym)
adamc@350 622 (ignore-errors
adamc@350 623 (while
adamc@350 624 (progn (urweb-backward-sexp prec)
adamc@350 625 (setq sym (save-excursion (urweb-forward-sym)))
adamc@350 626 (not (or (member sym syms) (bobp)))))
adamc@350 627 (if (member sym syms) sym))))
adamc@350 628
adamc@350 629 (defun urweb-skip-siblings ()
adamc@350 630 (while (and (not (bobp)) (urweb-backward-arg))
adamc@350 631 (urweb-find-matching-starter urweb-starters-syms)))
adamc@350 632
adamc@350 633 (defun urweb-beginning-of-defun ()
adamc@350 634 (let ((sym (urweb-find-matching-starter urweb-starters-syms)))
adamc@350 635 (if (member sym '("fun" "and" "functor" "signature" "structure"
adamc@350 636 "datatype"))
adamc@350 637 (save-excursion (urweb-forward-sym) (urweb-forward-spaces)
adamc@350 638 (urweb-forward-sym))
adamc@350 639 ;; We're inside a "non function declaration": let's skip all other
adamc@350 640 ;; declarations that we find at the same level and try again.
adamc@350 641 (urweb-skip-siblings)
adamc@350 642 ;; Obviously, let's not try again if we're at bobp.
adamc@350 643 (unless (bobp) (urweb-beginning-of-defun)))))
adamc@350 644
adamc@350 645 (defcustom urweb-max-name-components 3
adamc@350 646 "Maximum number of components to use for the current function name."
adamc@350 647 :group 'urweb
adamc@350 648 :type 'integer)
adamc@350 649
adamc@350 650 (defun urweb-current-fun-name ()
adamc@350 651 (save-excursion
adamc@350 652 (let ((count urweb-max-name-components)
adamc@350 653 fullname name)
adamc@350 654 (end-of-line)
adamc@350 655 (while (and (> count 0)
adamc@350 656 (setq name (urweb-beginning-of-defun)))
adamc@350 657 (decf count)
adamc@350 658 (setq fullname (if fullname (concat name "." fullname) name))
adamc@350 659 ;; Skip all other declarations that we find at the same level.
adamc@350 660 (urweb-skip-siblings))
adamc@350 661 fullname)))
adamc@350 662
adamc@350 663 (provide 'urweb-mode)
adamc@350 664
adamc@350 665 ;;; urweb-mode.el ends here