adamc@350: ;;; urweb-mode.el --- Major mode for editing (Standard) ML
adamc@350: 
adamc@350: ;; Based on sml-mode:
adamc@350: ;; Copyright (C) 1999,2000,2004  Stefan Monnier
adamc@350: ;; Copyright (C) 1994-1997  Matthew J. Morley
adamc@350: ;; Copyright (C) 1989       Lars Bo Nielsen
adamc@350: ;;
adamc@350: ;; Modified for urweb-mode:
adamc@350: ;; Copyright (C) 2008  Adam Chlipala <adamc@hcoop.net>
adamc@350: 
adamc@350: ;; Author: Lars Bo Nielsen
adamc@350: ;;      Olin Shivers
adamc@350: ;;	Fritz Knabe (?)
adamc@350: ;;	Steven Gilmore (?)
adamc@350: ;;	Matthew Morley <mjm@scs.leeds.ac.uk> (aka <matthew@verisity.com>)
adamc@350: ;;	Matthias Blume <blume@cs.princeton.edu> (aka <blume@kurims.kyoto-u.ac.jp>)
adamc@350: ;;      (Stefan Monnier) monnier@cs.yale.edu
adamc@350: ;;      Adam Chlipala
adamc@350: 
adamc@350: ;; This file is not part of GNU Emacs, but it is distributed under the
adamc@350: ;; same conditions.
adamc@350: 
adamc@350: ;; This program is free software; you can redistribute it and/or
adamc@350: ;; modify it under the terms of the GNU General Public License as
adamc@350: ;; published by the Free Software Foundation; either version 2, or (at
adamc@350: ;; your option) any later version.
adamc@350: 
adamc@350: ;; This program is distributed in the hope that it will be useful, but
adamc@350: ;; WITHOUT ANY WARRANTY; without even the implied warranty of
adamc@350: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
adamc@350: ;; General Public License for more details.
adamc@350: 
adamc@350: ;; You should have received a copy of the GNU General Public License
adamc@350: ;; along with GNU Emacs; see the file COPYING. If not, write to the
adamc@350: ;; Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
adamc@350: 
adamc@350: ;;; Commentary:
adamc@350: 
adamc@350: ;;; HISTORY
adamc@350: 
adamc@350: ;; Still under construction: History obscure, needs a biographer as
adamc@350: ;; well as a M-x doctor. Change Log on request.
adamc@350: 
adamc@358: ;; Hacked by Olin Shivers for comint from Lars Bo Nielsen's sml.el.
adamc@350: 
adamc@350: ;; Hacked by Matthew Morley to incorporate Fritz Knabe's hilite and
adamc@350: ;; font-lock patterns, some of Steven Gilmore's (reduced) easy-menus,
adamc@350: ;; and numerous bugs and bug-fixes.
adamc@350: 
adamc@350: ;;; DESCRIPTION
adamc@350: 
adamc@350: ;; See accompanying info file: urweb-mode.info
adamc@350: 
adamc@350: ;;; FOR YOUR .EMACS FILE
adamc@350: 
adamc@350: ;; If urweb-mode.el lives in some non-standard directory, you must tell
adamc@350: ;; emacs where to get it. This may or may not be necessary:
adamc@350: 
adamc@350: ;; (add-to-list 'load-path "~jones/lib/emacs/")
adamc@350: 
adamc@350: ;; Then to access the commands autoload urweb-mode with that command:
adamc@350: 
adamc@350: ;; (load "urweb-mode-startup")
adamc@350: 
adamc@350: ;; urweb-mode-hook is run whenever a new urweb-mode buffer is created.
adamc@350: 
adamc@350: ;;; Code:
adamc@350: 
adamc@350: (eval-when-compile (require 'cl))
adamc@350: (require 'urweb-util)
adamc@350: (require 'urweb-move)
adamc@350: (require 'urweb-defs)
adamc@350: (condition-case nil (require 'skeleton) (error nil))
adamc@350: 
adamc@350: ;;; VARIABLES CONTROLLING INDENTATION
adamc@350: 
adamc@350: (defcustom urweb-indent-level 4
adamc@350:   "*Indentation of blocks in Ur/Web (see also `urweb-structure-indent')."
adamc@350:   :group 'urweb
adamc@350:   :type '(integer))
adamc@350: 
adamc@350: (defcustom urweb-indent-args urweb-indent-level
adamc@350:   "*Indentation of args placed on a separate line."
adamc@350:   :group 'urweb
adamc@350:   :type '(integer))
adamc@350: 
adamc@350: (defcustom urweb-electric-semi-mode nil
adamc@350:   "*If non-nil, `\;' will self insert, reindent the line, and do a newline.
adamc@350: If nil, just insert a `\;'.  (To insert while t, do: \\[quoted-insert] \;)."
adamc@350:   :group 'urweb
adamc@350:   :type 'boolean)
adamc@350: 
adamc@350: (defcustom urweb-rightalign-and t
adamc@350:   "If non-nil, right-align `and' with its leader.
adamc@350: If nil:					If t:
adamc@350: 	datatype a = A				datatype a = A
adamc@350: 	and b = B				     and b = B"
adamc@350:   :group 'urweb
adamc@350:   :type 'boolean)
adamc@350: 
adamc@350: ;;; OTHER GENERIC MODE VARIABLES
adamc@350: 
adamc@350: (defvar urweb-mode-info "urweb-mode"
adamc@350:   "*Where to find Info file for `urweb-mode'.
adamc@350: The default assumes the info file \"urweb-mode.info\" is on Emacs' info
adamc@350: directory path.  If it is not, either put the file on the standard path
adamc@350: or set the variable `urweb-mode-info' to the exact location of this file
adamc@350: 
adamc@350:   (setq urweb-mode-info \"/usr/me/lib/info/urweb-mode\")
adamc@350: 
adamc@350: in your .emacs file. You can always set it interactively with the
adamc@350: set-variable command.")
adamc@350: 
adamc@350: (defvar urweb-mode-hook nil
adamc@350:   "*Run upon entering `urweb-mode'.
adamc@350: This is a good place to put your preferred key bindings.")
adamc@350: 
adamc@350: ;;; CODE FOR Ur/Web-MODE
adamc@350: 
adamc@350: (defun urweb-mode-info ()
adamc@350:   "Command to access the TeXinfo documentation for `urweb-mode'.
adamc@350: See doc for the variable `urweb-mode-info'."
adamc@350:   (interactive)
adamc@350:   (require 'info)
adamc@350:   (condition-case nil
adamc@350:       (info urweb-mode-info)
adamc@350:     (error (progn
adamc@350:              (describe-variable 'urweb-mode-info)
adamc@350:              (message "Can't find it... set this variable first!")))))
adamc@350: 
adamc@350: 
adamc@350: ;; font-lock setup
adamc@350: 
adamc@350: (defconst urweb-keywords-regexp
adamc@350:   (urweb-syms-re "and" "case" "class" "con" "constraint" "constraints"
adamc@350: 	       "datatype" "else" "end" "extern" "fn" "fold"
adamc@350: 	       "fun" "functor" "if" "include"
adamc@350: 	       "of" "open"
adamc@350: 	       "rec" "sequence" "sig" "signature"
adamc@350: 	       "struct" "structure" "table" "then" "type" "val" "where"
adamc@350: 	       "with"
adamc@350: 
adamc@350:                "Name" "Type" "Unit")
adamc@350:   "A regexp that matches any non-SQL keywords of Ur/Web.")
adamc@350: 
adamc@350: (defconst urweb-sql-keywords-regexp
adamc@350:   (urweb-syms-re "SELECT" "FROM" "AS" "WHERE" "SQL" "GROUP" "ORDER" "BY"
adamc@350:                  "HAVING" "LIMIT" "OFFSET" "ALL" "UNION" "INTERSECT" "EXCEPT"
adamc@350:                  "TRUE" "FALSE" "AND" "OR" "NOT" "COUNT" "AVG" "SUM" "MIN" "MAX"
adamc@350:                  "ASC" "DESC" "INSERT" "INTO" "VALUES" "UPDATE" "SET" "DELETE")
adamc@350:   "A regexp that matches SQL keywords.")
adamc@350: 
adamc@351: (defconst urweb-lident-regexp "\\<[a-z_][A-Za-z0-9_']*\\>"
adamc@351:   "A regexp that matches lowercase Ur/Web identifiers.")
adamc@351: 
adamc@351: (defconst urweb-cident-regexp "\\<[A-Z][A-Za-z0-9_']*\\>"
adamc@351:   "A regexp that matches uppercase Ur/Web identifiers.")
adamc@351: 
adamc@350: ;;; Font-lock settings ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
adamc@350: 
adamc@350: ;; The font lock regular expressions.
adamc@350: 
adamc@363: (defun urweb-in-xml ()
adamc@360:   (save-excursion
adamc@360:     (let (
adamc@360:           (depth 0)
adamc@360:           (finished nil)
adamc@360:           (answer nil)
adamc@360:           )
adamc@360:       (while (and (not finished) (re-search-backward "[<>{}]" nil t))
adamc@360:         (cond
adamc@360:          ((looking-at "{")
adamc@360:           (if (> depth 0)
adamc@363:               (decf depth)
adamc@360:             (setq finished t)))
adamc@360:          ((looking-at "}")
adamc@363:           (incf depth))
adamc@360:          ((save-excursion (backward-char 1) (or (looking-at "=>") (looking-at "->")))
adamc@360:           nil)
adamc@360:          ((looking-at "<")
adamc@360:           (setq finished t))
adamc@360:          ((looking-at ">")
adamc@360:           (if (> depth 0)
adamc@360:               (if (not (re-search-backward "<" nil t))
adamc@360:                   (setq finished t))
adamc@360:             (progn (backward-char 4)
adamc@360:                    (setq answer (not (or
adamc@360:                                       (looking-at "/xml")
adamc@360:                                       (looking-at "xml/"))))
adamc@360:                    (setq finished t))))))
adamc@360:       answer)))
adamc@360: 
adamc@360: (defun amAttribute (face)
adamc@360:   (if (ignore-errors (save-excursion (backward-word 2) (backward-char 1) (looking-at "<")))
adamc@360:       nil
adamc@360:     face))
adamc@358: 
adamc@350: (defconst urweb-font-lock-keywords
adamc@350:   `(;;(urweb-font-comments-and-strings)
adamc@362:     ("\\(<\\sw+\\)\\(\\s-\\|\\sw\\|=\\|\"[^\"]*\"\\|{[^}]*}\\)*\\(/?>\\)"
adamc@359:      (1 font-lock-tag-face)
adamc@359:      (3 font-lock-tag-face))
adamc@359:     ("\\(</\\sw+>\\)"
adamc@359:      (1 font-lock-tag-face))
adamc@359:     ("\\([^<>{}]+\\)"
adamc@363:      (1 (if (urweb-in-xml)
adamc@359:             font-lock-string-face
adamc@359:           nil)))
adamc@359: 
adamc@357:     ("\\<\\(fun\\|and\\)\\s-+\\(\\sw+\\)\\s-+[^ \t\n=]"
adamc@350:      (1 font-lock-keyword-face)
adamc@360:      (2 (amAttribute font-lock-function-name-face)))
adamc@357:     ("\\<\\(\\(data\\)?type\\|con\\|class\\)\\s-+\\(\\sw+\\)"
adamc@350:      (1 font-lock-keyword-face)
adamc@360:      (3 (amAttribute font-lock-type-def-face)))
adamc@353:     ("\\<\\(val\\|table\\|sequence\\)\\s-+\\(\\sw+\\>\\s-*\\)?\\(\\sw+\\)\\s-*[=:]"
adamc@350:      (1 font-lock-keyword-face)
adamc@360:      (3 (amAttribute font-lock-variable-name-face)))
adamc@350:     ("\\<\\(structure\\|functor\\)\\s-+\\(\\sw+\\)"
adamc@350:      (1 font-lock-keyword-face)
adamc@360:      (2 (amAttribute font-lock-module-def-face)))
adamc@350:     ("\\<\\(signature\\)\\s-+\\(\\sw+\\)"
adamc@350:      (1 font-lock-keyword-face)
adamc@360:      (2 (amAttribute font-lock-interface-def-face)))
adamc@350:     
adamc@350:     (,urweb-keywords-regexp . font-lock-keyword-face)
adamc@351:     (,urweb-sql-keywords-regexp . font-lock-sql-face)
adamc@351:     (,urweb-cident-regexp . font-lock-cvariable-face))
adamc@350:   "Regexps matching standard Ur/Web keywords.")
adamc@350: 
adamc@350: (defface font-lock-type-def-face
adamc@350:   '((t (:bold t)))
adamc@350:   "Font Lock mode face used to highlight type definitions."
adamc@350:   :group 'font-lock-highlighting-faces)
adamc@350: (defvar font-lock-type-def-face 'font-lock-type-def-face
adamc@350:   "Face name to use for type definitions.")
adamc@350: 
adamc@350: (defface font-lock-module-def-face
adamc@350:   '((t (:bold t)))
adamc@350:   "Font Lock mode face used to highlight module definitions."
adamc@350:   :group 'font-lock-highlighting-faces)
adamc@350: (defvar font-lock-module-def-face 'font-lock-module-def-face
adamc@350:   "Face name to use for module definitions.")
adamc@350: 
adamc@350: (defface font-lock-interface-def-face
adamc@350:   '((t (:bold t)))
adamc@350:   "Font Lock mode face used to highlight interface definitions."
adamc@350:   :group 'font-lock-highlighting-faces)
adamc@350: (defvar font-lock-interface-def-face 'font-lock-interface-def-face
adamc@350:   "Face name to use for interface definitions.")
adamc@350: 
adamc@350: (defface font-lock-sql-face
adamc@350:   '((t (:bold t)))
adamc@350:   "Font Lock mode face used to highlight SQL keywords."
adamc@350:   :group 'font-lock-highlighting-faces)
adamc@350: (defvar font-lock-sql-face 'font-lock-sql-face
adamc@350:   "Face name to use for SQL keywords.")
adamc@350: 
adamc@351: (defface font-lock-cvariable-face
adamc@351:   '((t (:foreground "dark blue")))
adamc@351:   "Font Lock mode face used to highlight capitalized identifiers."
adamc@351:   :group 'font-lock-highlighting-faces)
adamc@351: (defvar font-lock-cvariable-face 'font-lock-cvariable-face
adamc@351:   "Face name to use for capitalized identifiers.")
adamc@351: 
adamc@357: (defface font-lock-tag-face
adamc@357:   '((t (:bold t)))
adamc@357:   "Font Lock mode face used to highlight XML tags."
adamc@357:   :group 'font-lock-highlighting-faces)
adamc@357: (defvar font-lock-tag-face 'font-lock-tag-face
adamc@357:   "Face name to use for XML tags.")
adamc@357: 
adamc@358: (defface font-lock-attr-face
adamc@358:   '((t (:bold t)))
adamc@358:   "Font Lock mode face used to highlight XML attributes."
adamc@358:   :group 'font-lock-highlighting-faces)
adamc@358: (defvar font-lock-attr-face 'font-lock-attr-face
adamc@358:   "Face name to use for XML attributes.")
adamc@358: 
adamc@350: ;;
adamc@350: ;; Code to handle nested comments and unusual string escape sequences
adamc@350: ;;
adamc@350: 
adamc@350: (defsyntax urweb-syntax-prop-table
adamc@350:   '((?\\ . ".") (?* . "."))
adamc@350:   "Syntax table for text-properties")
adamc@350: 
adamc@350: ;; For Emacsen that have no built-in support for nested comments
adamc@350: (defun urweb-get-depth-st ()
adamc@350:   (save-excursion
adamc@350:     (let* ((disp (if (eq (char-before) ?\)) (progn (backward-char) -1) nil))
adamc@350: 	   (_ (backward-char))
adamc@350: 	   (disp (if (eq (char-before) ?\() (progn (backward-char) 0) disp))
adamc@350: 	   (pt (point)))
adamc@350:       (when disp
adamc@350: 	(let* ((depth
adamc@350: 		(save-match-data
adamc@350: 		  (if (re-search-backward "\\*)\\|(\\*" nil t)
adamc@350: 		      (+ (or (get-char-property (point) 'comment-depth) 0)
adamc@350: 			 (case (char-after) (?\( 1) (?* 0))
adamc@350: 			 disp)
adamc@350: 		    0)))
adamc@350: 	       (depth (if (> depth 0) depth)))
adamc@350: 	  (put-text-property pt (1+ pt) 'comment-depth depth)
adamc@350: 	  (when depth urweb-syntax-prop-table))))))
adamc@350: 
adamc@350: (defconst urweb-font-lock-syntactic-keywords
adamc@350:   `(("^\\s-*\\(\\\\\\)" (1 ',urweb-syntax-prop-table))
adamc@350:     ,@(unless urweb-builtin-nested-comments-flag
adamc@350: 	'(("(?\\(\\*\\))?" (1 (urweb-get-depth-st)))))))
adamc@350: 
adamc@350: (defconst urweb-font-lock-defaults
adamc@350:   '(urweb-font-lock-keywords nil nil ((?_ . "w") (?' . "w")) nil
adamc@350:     (font-lock-syntactic-keywords . urweb-font-lock-syntactic-keywords)))
adamc@350: 
adamc@350: ;;;;
adamc@350: ;;;; Imenu support
adamc@350: ;;;;
adamc@350: 
adamc@350: (defvar urweb-imenu-regexp
adamc@350:   (concat "^[ \t]*\\(let[ \t]+\\)?"
adamc@350: 	  (regexp-opt (append urweb-module-head-syms
adamc@350: 			      '("and" "fun" "datatype" "type")) t)
adamc@350: 	  "\\>"))
adamc@350: 
adamc@350: (defun urweb-imenu-create-index ()
adamc@350:   (let (alist)
adamc@350:     (goto-char (point-max))
adamc@350:     (while (re-search-backward urweb-imenu-regexp nil t)
adamc@350:       (save-excursion
adamc@350: 	(let ((kind (match-string 2))
adamc@350: 	      (column (progn (goto-char (match-beginning 2)) (current-column)))
adamc@350: 	      (location
adamc@350: 	       (progn (goto-char (match-end 0))
adamc@350: 		      (urweb-forward-spaces)
adamc@350: 		      (when (looking-at urweb-tyvarseq-re)
adamc@350: 			(goto-char (match-end 0)))
adamc@350: 		      (point)))
adamc@350: 	      (name (urweb-forward-sym)))
adamc@350: 	  ;; Eliminate trivial renamings.
adamc@350: 	  (when (or (not (member kind '("structure" "signature")))
adamc@350: 		    (progn (search-forward "=")
adamc@350: 			   (urweb-forward-spaces)
adamc@350: 			   (looking-at "sig\\|struct")))
adamc@350: 	    (push (cons (concat (make-string (/ column 2) ?\ ) name) location)
adamc@350: 		  alist)))))
adamc@350:     alist))
adamc@350: 
adamc@350: ;;; MORE CODE FOR URWEB-MODE
adamc@350: 
adamc@350: ;;;###autoload (add-to-list 'load-path (file-name-directory load-file-name))
adamc@350: ;;;###autoload
adamc@362: (add-to-list 'auto-mode-alist '("\\.urs?\\'" . urweb-mode))
adamc@350: 
adamc@350: ;;;###autoload
adamc@350: (define-derived-mode urweb-mode fundamental-mode "Ur/Web"
adamc@350:   "\\<urweb-mode-map>Major mode for editing Ur/Web code.
adamc@350: This mode runs `urweb-mode-hook' just before exiting.
adamc@350: \\{urweb-mode-map}"
adamc@350:   (set (make-local-variable 'font-lock-defaults) urweb-font-lock-defaults)
adamc@358:   (set (make-local-variable 'font-lock-multiline) 'undecided)
adamc@350:   (set (make-local-variable 'outline-regexp) urweb-outline-regexp)
adamc@350:   (set (make-local-variable 'imenu-create-index-function)
adamc@350:        'urweb-imenu-create-index)
adamc@350:   (set (make-local-variable 'add-log-current-defun-function)
adamc@350:        'urweb-current-fun-name)
adamc@350:   ;; Treat paragraph-separators in comments as paragraph-separators.
adamc@350:   (set (make-local-variable 'paragraph-separate)
adamc@350:        (concat "\\([ \t]*\\*)?\\)?\\(" paragraph-separate "\\)"))
adamc@350:   (set (make-local-variable 'require-final-newline) t)
adamc@350:   ;; forward-sexp-function is an experimental variable in my hacked Emacs.
adamc@350:   (set (make-local-variable 'forward-sexp-function) 'urweb-user-forward-sexp)
adamc@350:   ;; For XEmacs
adamc@350:   (easy-menu-add urweb-mode-menu)
adamc@358: 
adamc@350:   ;; Compatibility.  FIXME: we should use `-' in Emacs-CVS.
adamc@350:   (unless (boundp 'skeleton-positions) (set (make-local-variable '@) nil))
adamc@358: 
adamc@360:   (urweb-mode-variables))
adamc@350: 
adamc@350: (defun urweb-mode-variables ()
adamc@350:   (set-syntax-table urweb-mode-syntax-table)
adamc@350:   (setq local-abbrev-table urweb-mode-abbrev-table)
adamc@350:   ;; A paragraph is separated by blank lines or ^L only.
adamc@350:   
adamc@350:   (set (make-local-variable 'indent-line-function) 'urweb-indent-line)
adamc@350:   (set (make-local-variable 'comment-start) "(* ")
adamc@350:   (set (make-local-variable 'comment-end) " *)")
adamc@350:   (set (make-local-variable 'comment-nested) t)
adamc@350:   ;;(set (make-local-variable 'block-comment-start) "* ")
adamc@350:   ;;(set (make-local-variable 'block-comment-end) "")
adamc@350:   ;; (set (make-local-variable 'comment-column) 40)
adamc@350:   (set (make-local-variable 'comment-start-skip) "(\\*+\\s-*"))
adamc@350: 
adamc@350: (defun urweb-funname-of-and ()
adamc@350:   "Name of the function this `and' defines, or nil if not a function.
adamc@350: Point has to be right after the `and' symbol and is not preserved."
adamc@350:   (urweb-forward-spaces)
adamc@350:   (if (looking-at urweb-tyvarseq-re) (goto-char (match-end 0)))
adamc@350:   (let ((sym (urweb-forward-sym)))
adamc@350:     (urweb-forward-spaces)
adamc@350:     (unless (or (member sym '(nil "d="))
adamc@350: 		(member (urweb-forward-sym) '("d=")))
adamc@350:       sym)))
adamc@350: 
adamc@350: ;;; INDENTATION !!!
adamc@350: 
adamc@350: (defun urweb-mark-function ()
adamc@350:   "Synonym for `mark-paragraph' -- sorry.
adamc@350: If anyone has a good algorithm for this..."
adamc@350:   (interactive)
adamc@350:   (mark-paragraph))
adamc@350: 
adamc@350: (defun urweb-indent-line ()
adamc@350:   "Indent current line of Ur/Web code."
adamc@350:   (interactive)
adamc@350:   (let ((savep (> (current-column) (current-indentation)))
adamc@350: 	(indent (max (or (ignore-errors (urweb-calculate-indentation)) 0) 0)))
adamc@350:     (if savep
adamc@350: 	(save-excursion (indent-line-to indent))
adamc@350:       (indent-line-to indent))))
adamc@350: 
adamc@350: (defun urweb-back-to-outer-indent ()
adamc@350:   "Unindents to the next outer level of indentation."
adamc@350:   (interactive)
adamc@350:   (save-excursion
adamc@350:     (beginning-of-line)
adamc@350:     (skip-chars-forward "\t ")
adamc@350:     (let ((start-column (current-column))
adamc@350:           (indent (current-column)))
adamc@350:       (if (> start-column 0)
adamc@350:           (progn
adamc@350:             (save-excursion
adamc@350:               (while (>= indent start-column)
adamc@350:                 (if (re-search-backward "^[^\n]" nil t)
adamc@350:                     (setq indent (current-indentation))
adamc@350:                   (setq indent 0))))
adamc@350:             (backward-delete-char-untabify (- start-column indent)))))))
adamc@350: 
adamc@350: (defun urweb-find-comment-indent ()
adamc@350:   (save-excursion
adamc@350:     (let ((depth 1))
adamc@350:       (while (> depth 0)
adamc@350: 	(if (re-search-backward "(\\*\\|\\*)" nil t)
adamc@350: 	    (cond
adamc@350: 	     ;; FIXME: That's just a stop-gap.
adamc@350: 	     ((eq (get-text-property (point) 'face) 'font-lock-string-face))
adamc@350: 	     ((looking-at "*)") (incf depth))
adamc@350: 	     ((looking-at comment-start-skip) (decf depth)))
adamc@350: 	  (setq depth -1)))
adamc@350:       (if (= depth 0)
adamc@350: 	  (1+ (current-column))
adamc@350: 	nil))))
adamc@350: 
adamc@369: (defun urweb-empty-line ()
adamc@365:   (save-excursion
adamc@369:     (beginning-of-line)
adamc@365:     (let ((start-pos (point)))
adamc@369:       (end-of-line)
adamc@369:       (not (re-search-backward "[^\n \t]" start-pos t)))))
adamc@365: 
adamc@369: (defun urweb-seek-back ()
adamc@369:   (while (urweb-empty-line) (previous-line 1)))
adamc@363: 
adamc@369: (defun urweb-skip-matching-braces ()
adamc@367:   "Skip backwards past matching brace pairs, to calculate XML indentation after quoted Ur code"
adamc@367:   (beginning-of-line)
adamc@367:   (let ((start-pos (point))
adamc@367:         (depth 0))
adamc@367:     (end-of-line)
adamc@367:     (while (re-search-backward "[{}]" start-pos t)
adamc@367:       (cond
adamc@367:        ((looking-at "}")
adamc@367:         (incf depth))
adamc@367:        ((looking-at "{")
adamc@367:         (decf depth))))
adamc@367:     (while (and (> depth 0) (re-search-backward "[{}]" nil t)
adamc@367:       (cond
adamc@367:        ((looking-at "}")
adamc@367:         (incf depth))
adamc@367:        ((looking-at "{")
adamc@367:         (decf depth)))))))
adamc@367: 
adamc@369: (defun urweb-new-tags ()
adamc@369:   "Decide if the previous line of XML introduced unclosed tags"
adamc@369:   (save-excursion
adamc@369:     (let ((start-pos (point))
adamc@369:           (depth 0)
adamc@369:           (done nil))
adamc@369:       (previous-line 1)
adamc@369:       (urweb-seek-back)
adamc@369:       (urweb-skip-matching-braces)
adamc@369:       (urweb-seek-back)
adamc@369:       (beginning-of-line)
adamc@369:       (while (and (not done) (search-forward "<" start-pos t))
adamc@369:         (if (looking-at "/")
adamc@369:           (if (search-forward ">" start-pos t)
adamc@369:               (when (> depth 0) (decf depth))
adamc@369:             (setq done t))
adamc@369:           (if (search-forward ">" start-pos t)
adamc@369:               (if (not (save-excursion (backward-char 2) (looking-at "/")))
adamc@369:                   (incf depth))
adamc@369:             (setq done t))))
adamc@369:       (and (not done) (> depth 0)))))
adamc@369: 
adamc@363: (defun urweb-tag-matching-indent ()
adamc@363:   "Seek back to a matching opener tag and get its line's indent"
adamc@363:   (save-excursion
adamc@369:     (end-of-line)
adamc@369:     (search-backward "</" nil t)
adamc@368:     (urweb-tag-matcher)
adamc@369:     (beginning-of-line)
adamc@369:     (current-indentation)))
adamc@363: 
adamc@350: (defun urweb-calculate-indentation ()
adamc@350:   (save-excursion
adamc@350:     (beginning-of-line) (skip-chars-forward "\t ")
adamc@350:     (urweb-with-ist
adamc@350:      ;; Indentation for comments alone on a line, matches the
adamc@350:      ;; proper indentation of the next line.
adamc@350:      (when (looking-at "(\\*") (urweb-forward-spaces))
adamc@350:      (let (data
adamc@350: 	   (sym (save-excursion (urweb-forward-sym))))
adamc@350:        (or
adamc@350: 	;; Allow the user to override the indentation.
adamc@350: 	(when (looking-at (concat ".*" (regexp-quote comment-start)
adamc@350: 				  "[ \t]*fixindent[ \t]*"
adamc@350: 				  (regexp-quote comment-end)))
adamc@350: 	  (current-indentation))
adamc@350: 
adamc@350: 	;; Continued comment.
adamc@350: 	(and (looking-at "\\*") (urweb-find-comment-indent))
adamc@350: 
adamc@363:         (and (urweb-in-xml)
adamc@363:              (let ((prev-indent (save-excursion
adamc@363:                                   (previous-line 1)
adamc@369:                                   (urweb-seek-back)
adamc@369:                                   (urweb-skip-matching-braces)
adamc@369:                                   (urweb-seek-back)
adamc@363:                                   (current-indentation))))
adamc@363:                (cond
adamc@363:                 ((looking-at "</")
adamc@363:                  (urweb-tag-matching-indent))
adamc@363:                 ((urweb-new-tags)
adamc@363:                  (+ prev-indent 2))
adamc@363:                 (t
adamc@363:                  prev-indent))))
adamc@363: 
adamc@350: 	;; Continued string ? (Added 890113 lbn)
adamc@350: 	(and (looking-at "\\\\")
adamc@350: 	     (save-excursion
adamc@350: 	       (if (save-excursion (previous-line 1)
adamc@350: 				   (beginning-of-line)
adamc@350: 				   (looking-at "[\t ]*\\\\"))
adamc@350: 		   (progn (previous-line 1) (current-indentation))
adamc@350: 		 (if (re-search-backward "[^\\\\]\"" nil t)
adamc@350: 		     (1+ (current-column))
adamc@350: 		   0))))
adamc@350: 
adamc@350: 	;; Closing parens.  Could be handled below with `urweb-indent-relative'?
adamc@350: 	(and (looking-at "\\s)")
adamc@350: 	     (save-excursion
adamc@350: 	       (skip-syntax-forward ")")
adamc@350: 	       (backward-sexp 1)
adamc@350: 	       (if (urweb-dangling-sym)
adamc@350: 		   (urweb-indent-default 'noindent)
adamc@350: 		 (current-column))))
adamc@350: 
adamc@350: 	(and (setq data (assoc sym urweb-close-paren))
adamc@350: 	     (urweb-indent-relative sym data))
adamc@350: 
adamc@350: 	(and (member sym urweb-starters-syms)
adamc@350: 	     (urweb-indent-starter sym))
adamc@350: 
adamc@350: 	(and (string= sym "|") (urweb-indent-pipe))
adamc@350: 
adamc@350: 	(urweb-indent-arg)
adamc@350: 	(urweb-indent-default))))))
adamc@350: 
adamc@350: (defsubst urweb-bolp ()
adamc@350:   (save-excursion (skip-chars-backward " \t|") (bolp)))
adamc@350: 
adamc@350: (defun urweb-indent-starter (orig-sym)
adamc@350:   "Return the indentation to use for a symbol in `urweb-starters-syms'.
adamc@350: Point should be just before the symbol ORIG-SYM and is not preserved."
adamc@350:   (let ((sym (unless (save-excursion (urweb-backward-arg))
adamc@350: 	       (urweb-backward-spaces)
adamc@350: 	       (urweb-backward-sym))))
adamc@366:     (if (and (= sym ">") (save-excursion (backward-char 5) (looking-at "</xml")))
adamc@366:         (setq sym "</xml>"))
adamc@350:     (if (member sym '(";" "d=")) (setq sym nil))
adamc@350:     (if sym (urweb-get-sym-indent sym)
adamc@350:       ;; FIXME: this can take a *long* time !!
adamc@350:       (setq sym (urweb-find-matching-starter urweb-starters-syms))
adamc@350:       ;; Don't align with `and' because it might be specially indented.
adamc@350:       (if (and (or (equal orig-sym "and") (not (equal sym "and")))
adamc@350: 	       (urweb-bolp))
adamc@350: 	  (+ (current-column)
adamc@350: 	     (if (and urweb-rightalign-and (equal orig-sym "and"))
adamc@350: 		 (- (length sym) 3) 0))
adamc@350: 	(urweb-indent-starter orig-sym)))))
adamc@350: 
adamc@350: (defun urweb-indent-relative (sym data)
adamc@350:   (save-excursion
adamc@350:     (urweb-forward-sym) (urweb-backward-sexp nil)
adamc@350:     (unless (second data) (urweb-backward-spaces) (urweb-backward-sym))
adamc@350:     (+ (or (cdr (assoc sym urweb-symbol-indent)) 0)
adamc@350:        (urweb-delegated-indent))))
adamc@350: 
adamc@350: (defun urweb-indent-pipe ()
adamc@350:   (let ((sym (urweb-find-matching-starter urweb-pipeheads
adamc@350: 					(urweb-op-prec "|" 'back))))
adamc@350:     (when sym
adamc@350:       (if (string= sym "|")
adamc@350: 	  (if (urweb-bolp) (current-column) (urweb-indent-pipe))
adamc@350: 	(let ((pipe-indent (or (cdr (assoc "|" urweb-symbol-indent)) -2)))
adamc@350: 	  (when (or (member sym '("datatype"))
adamc@350: 		    (and (equal sym "and")
adamc@350: 			 (save-excursion
adamc@350: 			   (forward-word 1)
adamc@350: 			   (not (urweb-funname-of-and)))))
adamc@350: 	    (re-search-forward "="))
adamc@350: 	  (urweb-forward-sym)
adamc@350: 	  (urweb-forward-spaces)
adamc@350: 	  (+ pipe-indent (current-column)))))))
adamc@350: 
adamc@350: (defun urweb-find-forward (re)
adamc@350:   (urweb-forward-spaces)
adamc@350:   (while (and (not (looking-at re))
adamc@350: 	      (progn
adamc@350: 		(or (ignore-errors (forward-sexp 1) t) (forward-char 1))
adamc@350: 		(urweb-forward-spaces)
adamc@350: 		(not (looking-at re))))))
adamc@350: 
adamc@350: (defun urweb-indent-arg ()
adamc@350:   (and (save-excursion (ignore-errors (urweb-forward-arg)))
adamc@350:        ;;(not (looking-at urweb-not-arg-re))
adamc@350:        ;; looks like a function or an argument
adamc@350:        (urweb-move-if (urweb-backward-arg))
adamc@350:        ;; an argument
adamc@350:        (if (save-excursion (not (urweb-backward-arg)))
adamc@350: 	   ;; a first argument
adamc@350: 	   (+ (current-column) urweb-indent-args)
adamc@350: 	 ;; not a first arg
adamc@350: 	 (while (and (/= (current-column) (current-indentation))
adamc@350: 		     (urweb-move-if (urweb-backward-arg))))
adamc@350: 	 (unless (save-excursion (urweb-backward-arg))
adamc@350: 	   ;; all earlier args are on the same line
adamc@350: 	   (urweb-forward-arg) (urweb-forward-spaces))
adamc@350: 	 (current-column))))
adamc@350: 
adamc@350: (defun urweb-get-indent (data sym)
adamc@350:   (let (d)
adamc@350:     (cond
adamc@350:      ((not (listp data)) data)
adamc@350:      ((setq d (member sym data)) (cadr d))
adamc@350:      ((and (consp data) (not (stringp (car data)))) (car data))
adamc@350:      (t urweb-indent-level))))
adamc@350: 
adamc@350: (defun urweb-dangling-sym ()
adamc@350:   "Non-nil if the symbol after point is dangling.
adamc@350: The symbol can be an Ur/Web symbol or an open-paren. \"Dangling\" means that
adamc@350: it is not on its own line but is the last element on that line."
adamc@350:   (save-excursion
adamc@350:     (and (not (urweb-bolp))
adamc@350: 	 (< (urweb-point-after (end-of-line))
adamc@350: 	    (urweb-point-after (or (urweb-forward-sym) (skip-syntax-forward "("))
adamc@350: 			     (urweb-forward-spaces))))))
adamc@350: 
adamc@350: (defun urweb-delegated-indent ()
adamc@350:   (if (urweb-dangling-sym)
adamc@350:       (urweb-indent-default 'noindent)
adamc@350:     (urweb-move-if (backward-word 1)
adamc@350: 		 (looking-at urweb-agglomerate-re))
adamc@350:     (current-column)))
adamc@350: 
adamc@350: (defun urweb-get-sym-indent (sym &optional style)
adamc@350:   "Find the indentation for the SYM we're `looking-at'.
adamc@350: If indentation is delegated, point will move to the start of the parent.
adamc@350: Optional argument STYLE is currently ignored."
adamc@350:   (assert (equal sym (save-excursion (urweb-forward-sym))))
adamc@350:   (save-excursion
adamc@350:     (let ((delegate (and (not (equal sym "end")) (assoc sym urweb-close-paren)))
adamc@350: 	  (head-sym sym))
adamc@350:       (when (and delegate (not (eval (third delegate))))
adamc@350: 	;;(urweb-find-match-backward sym delegate)
adamc@350: 	(urweb-forward-sym) (urweb-backward-sexp nil)
adamc@350: 	(setq head-sym
adamc@350: 	      (if (second delegate)
adamc@350: 		  (save-excursion (urweb-forward-sym))
adamc@350: 		(urweb-backward-spaces) (urweb-backward-sym))))
adamc@350: 
adamc@350:       (let ((idata (assoc head-sym urweb-indent-rule)))
adamc@350: 	(when idata
adamc@350: 	  ;;(if (or style (not delegate))
adamc@350: 	  ;; normal indentation
adamc@350: 	  (let ((indent (urweb-get-indent (cdr idata) sym)))
adamc@350: 	    (when indent (+ (urweb-delegated-indent) indent)))
adamc@350: 	  ;; delgate indentation to the parent
adamc@350: 	  ;;(urweb-forward-sym) (urweb-backward-sexp nil)
adamc@350: 	  ;;(let* ((parent-sym (save-excursion (urweb-forward-sym)))
adamc@350: 	  ;;     (parent-indent (cdr (assoc parent-sym urweb-indent-starters))))
adamc@350: 	  ;; check the special rules
adamc@350: 	  ;;(+ (urweb-delegated-indent)
adamc@350: 	  ;; (or (urweb-get-indent (cdr indent-data) 1 'strict)
adamc@350: 	  ;; (urweb-get-indent (cdr parent-indent) 1 'strict)
adamc@350: 	  ;; (urweb-get-indent (cdr indent-data) 0)
adamc@350: 	  ;; (urweb-get-indent (cdr parent-indent) 0))))))))
adamc@350: 	  )))))
adamc@350: 
adamc@350: (defun urweb-indent-default (&optional noindent)
adamc@350:   (let* ((sym-after (save-excursion (urweb-forward-sym)))
adamc@350: 	 (_ (urweb-backward-spaces))
adamc@350: 	 (sym-before (urweb-backward-sym))
adamc@350: 	 (sym-indent (and sym-before (urweb-get-sym-indent sym-before)))
adamc@350: 	 (indent-after (or (cdr (assoc sym-after urweb-symbol-indent)) 0)))
adamc@350:     (when (equal sym-before "end")
adamc@350:       ;; I don't understand what's really happening here, but when
adamc@350:       ;; it's `end' clearly, we need to do something special.
adamc@350:       (forward-word 1)
adamc@350:       (setq sym-before nil sym-indent nil))
adamc@350:     (cond
adamc@350:      (sym-indent
adamc@350:       ;; the previous sym is an indentation introducer: follow the rule
adamc@350:       (if noindent
adamc@350: 	  ;;(current-column)
adamc@350: 	  sym-indent
adamc@350: 	(+ sym-indent indent-after)))
adamc@350:      ;; If we're just after a hanging open paren.
adamc@350:      ((and (eq (char-syntax (preceding-char)) ?\()
adamc@350: 	   (save-excursion (backward-char) (urweb-dangling-sym)))
adamc@350:       (backward-char)
adamc@350:       (urweb-indent-default))
adamc@350:      (t
adamc@350:       ;; default-default
adamc@350:       (let* ((prec-after (urweb-op-prec sym-after 'back))
adamc@350: 	     (prec (or (urweb-op-prec sym-before 'back) prec-after 100)))
adamc@350: 	;; go back until you hit a symbol that has a lower prec than the
adamc@350: 	;; "current one", or until you backed over a sym that has the same prec
adamc@350: 	;; but is at the beginning of a line.
adamc@350: 	(while (and (not (urweb-bolp))
adamc@350: 		    (while (urweb-move-if (urweb-backward-sexp (1- prec))))
adamc@350: 		    (not (urweb-bolp)))
adamc@350: 	  (while (urweb-move-if (urweb-backward-sexp prec))))
adamc@350: 	(if noindent
adamc@350: 	    ;; the `noindent' case does back over an introductory symbol
adamc@350: 	    ;; such as `fun', ...
adamc@350: 	    (progn
adamc@350: 	      (urweb-move-if
adamc@350: 	       (urweb-backward-spaces)
adamc@350: 	       (member (urweb-backward-sym) urweb-starters-syms))
adamc@350: 	      (current-column))
adamc@350: 	  ;; Use `indent-after' for cases such as when , or ; should be
adamc@350: 	  ;; outdented so that their following terms are aligned.
adamc@350: 	  (+ (if (progn
adamc@350: 		   (if (equal sym-after ";")
adamc@350: 		       (urweb-move-if
adamc@350: 			(urweb-backward-spaces)
adamc@350: 			(member (urweb-backward-sym) urweb-starters-syms)))
adamc@350: 		   (and sym-after (not (looking-at sym-after))))
adamc@350: 		 indent-after 0)
adamc@350: 	     (current-column))))))))
adamc@350: 
adamc@350: 
adamc@350: ;; maybe `|' should be set to word-syntax in our temp syntax table ?
adamc@350: (defun urweb-current-indentation ()
adamc@350:   (save-excursion
adamc@350:     (beginning-of-line)
adamc@350:     (skip-chars-forward " \t|")
adamc@350:     (current-column)))
adamc@350: 
adamc@350: 
adamc@350: (defun urweb-find-matching-starter (syms &optional prec)
adamc@350:   (let (sym)
adamc@350:     (ignore-errors
adamc@350:       (while
adamc@350: 	  (progn (urweb-backward-sexp prec)
adamc@350: 		 (setq sym (save-excursion (urweb-forward-sym)))
adamc@350: 		 (not (or (member sym syms) (bobp)))))
adamc@350:       (if (member sym syms) sym))))
adamc@350: 
adamc@350: (defun urweb-skip-siblings ()
adamc@350:   (while (and (not (bobp)) (urweb-backward-arg))
adamc@350:     (urweb-find-matching-starter urweb-starters-syms)))
adamc@350: 
adamc@350: (defun urweb-beginning-of-defun ()
adamc@350:   (let ((sym (urweb-find-matching-starter urweb-starters-syms)))
adamc@350:     (if (member sym '("fun" "and" "functor" "signature" "structure"
adamc@350: 		      "datatype"))
adamc@350: 	(save-excursion (urweb-forward-sym) (urweb-forward-spaces)
adamc@350: 			(urweb-forward-sym))
adamc@350:       ;; We're inside a "non function declaration": let's skip all other
adamc@350:       ;; declarations that we find at the same level and try again.
adamc@350:       (urweb-skip-siblings)
adamc@350:       ;; Obviously, let's not try again if we're at bobp.
adamc@350:       (unless (bobp) (urweb-beginning-of-defun)))))
adamc@350: 
adamc@350: (defcustom urweb-max-name-components 3
adamc@350:   "Maximum number of components to use for the current function name."
adamc@350:   :group 'urweb
adamc@350:   :type 'integer)
adamc@350: 
adamc@350: (defun urweb-current-fun-name ()
adamc@350:   (save-excursion
adamc@350:     (let ((count urweb-max-name-components)
adamc@350: 	  fullname name)
adamc@350:       (end-of-line)
adamc@350:       (while (and (> count 0)
adamc@350: 		  (setq name (urweb-beginning-of-defun)))
adamc@350: 	(decf count)
adamc@350: 	(setq fullname (if fullname (concat name "." fullname) name))
adamc@350: 	;; Skip all other declarations that we find at the same level.
adamc@350: 	(urweb-skip-siblings))
adamc@350:       fullname)))
adamc@350: 
adamc@358: 
adamc@358: 
adamc@350: (provide 'urweb-mode)
adamc@350: 
adamc@350: ;;; urweb-mode.el ends here