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