+;;; xquery-mode.el --- A simple mode for editing xquery programs
+;; Time-stamp: <2005-03-26 18:05:39 sacharya>
+
+;;; Copyright (C) 2005 Suraj Acharya
+
+;; Author: Suraj Acharya <sacharya@cs.indiana.edu>
+
+;; This file is not part of GNU Emacs.
+
+;; xquery-mode.el 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 software 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, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+;;;
+
+(require 'nxml-mode)
+
+;;; Code:
+(define-generic-mode 'xquery-mode
+ '(("(:" . ":)") ("<!--" . "-->"))
+ '("xquery" "version" "encoding" "at" "module" "namespace" "child" "descendant" "parent" "attribute" "self" "descendant-or-self" "ancestor" "following-sibling" "preceding-sibling" "following" "preceding" "ancestor-or-self" "declare" "function" "option" "ordering" "ordered" "unordered" "default" "order" "external" "or" "and" "div" "idiv" "mod" "in" "construction" "satisfies" "return" "then" "else" "boundary-space" "base-uri" "preserve" "strip" "copy-namespaces" "no-preserve" "inherit" "no-inherit" "to" "where" "collation" "intersect" "union" "except" "as" "case" "instance" "of" "castable" "item" "element" "schema-element" "schema-attribute" "processing-instruction" "comment" "text" "empty" "import" "schema" "is" "eq" "ne" "gt" "ge" "lt" "le" "some" "every" "for" "let" "cast" "treat" "validate" "document-node" "document" "node" "if" "typeswitch" "by" "stable" "ascending" "descending" "greatest" "least" "variable") ;keywords
+ '(("\\(\\$\\w+\\)" 1 font-lock-variable-name-face) ;; \\(\\s_\\|\\w\\)
+ ("\\(\\w*:?\\w+\\)\\s *(" 1 font-lock-function-name-face)
+ ("\\(<\\)\\(/?\\)\\(\\w*\\)\\(:?\\)\\(\\w+\\).*?\\(/?\\)\\(>\\)"
+ (1 'nxml-tag-delimiter-face)
+ (2 'nxml-tag-slash-face)
+ (3 'nxml-element-prefix-face)
+ (4 'nxml-element-colon-face)
+ (5 'nxml-element-local-name-face)
+ (6 'nxml-tag-slash-face)
+ (7 'nxml-tag-delimiter-face)
+ )
+ ("\\(\\w*\\)\\(:?\\)\\(\\w+\\)=\\([\"']\\)\\(.*?\\)\\([\"']\\)"
+ (1 'nxml-attribute-prefix-face)
+ (2 'nxml-attribute-colon-face)
+ (3 'nxml-attribute-local-name-face)
+ (4 'nxml-attribute-value-delimiter-face)
+ (5 'nxml-attribute-value-face)
+ (6 'nxml-attribute-value-delimiter-face))
+ ("\\(/\\)\\(\\w*\\)\\(:?\\)\\(\\w+\\)"
+ (1 font-lock-constant-face)
+ (2 font-lock-constant-face)
+ (3 font-lock-constant-face)
+ (4 font-lock-constant-face)
+ )
+ ("as\\s +\\(\\w*:?\\w+\\)"
+ (1 font-lock-type-face)
+ )
+ ) ;font-lock-list
+ '(".xq\\'") ;auto-mode-list
+ '(xquery-set-indent-function xquery-set-up-syntax-table) ;function list
+ "A Major mode for editing xquery."
+ )
+
+
+
+(defun xquery-set-indent-function ()
+ "Set the indent function for xquery mode."
+ (setq nxml-prolog-end (point-min))
+ (setq nxml-scan-end (copy-marker (point-min) nil))
+ (set (make-local-variable 'indent-line-function) 'xquery-indent-line)
+ (make-local-variable 'forward-sexp-function)
+ (setq forward-sexp-function 'xquery-forward-sexp)
+ (local-set-key "/" 'nxml-electric-slash)
+ )
+
+(defun xquery-forward-sexp (&optional arg)
+ "Xquery forward s-expresssion.
+This function is not very smart, it tries to use
+`nxml-forward-balanced-item' if it sees '>' or '<' characters in
+the direction you are going, and uses the regular `forward-sexp'
+otherwise. "
+ (if (> arg 0)
+ (progn
+ (if (looking-at "[ \t]*<")
+ (nxml-forward-balanced-item arg)
+ (let ((forward-sexp-function nil)) (forward-sexp arg))))
+ (if (looking-back ">[ \t]*")
+ (nxml-forward-balanced-item arg)
+ (let ((forward-sexp-function nil)) (forward-sexp arg))))
+ )
+
+
+(defun xquery-set-up-syntax-table ()
+ "Allow the hypen character to be recognized as part of a xquery symbol."
+ (modify-syntax-entry ?- "w" (syntax-table))
+ (modify-syntax-entry ?/ "." (syntax-table))
+ ;; set-up the syntax table correctly for parentheis type characters
+ (modify-syntax-entry ?\{ "(}" (syntax-table))
+ (modify-syntax-entry ?\} "){" (syntax-table))
+ (modify-syntax-entry ?\[ "(]" (syntax-table))
+ (modify-syntax-entry ?\] ")]" (syntax-table))
+ (modify-syntax-entry ?\< "(>1" (syntax-table))
+ (modify-syntax-entry ?\> ")<4" (syntax-table))
+ ;; xquery comments are like (: :)
+ (modify-syntax-entry ?\( "()1" (syntax-table))
+ (modify-syntax-entry ?\) ")(4" (syntax-table))
+;; (modify-syntax-entry ?\: ".23" (syntax-table))
+ )
+
+
+
+(defun xquery-indent-line ()
+ "Indent current line as xquery code."
+ (interactive)
+ (let ((savep (> (current-column) (current-indentation)))
+ (indent (condition-case err (max (xquery-calculate-indentation) 0)
+ (error (message "%S" err)))))
+ (if savep
+ (save-excursion (indent-line-to indent))
+ (indent-line-to indent))))
+
+(defvar xquery-start-block-regexp "[ \t]*\\((\|{\\|for\\|let\\|where\\|return\\|if\\|else\\|typeswitch\\|declare[ \t]+function\\|.*[({]$\\)"
+ "A regular expression which indicates that a xquery block is starting.")
+
+(defvar xquery-flwr-block-regexp "[ \t]*\\(for\\|let\\|where\\|return\\|order\\|stable\\s *order\\)")
+
+(defvar xquery-indent-size 2
+ "The size of each indent level.")
+
+(defvar xquery-indent-debug nil)
+
+(defun xquery-toggle-debug-indent ()
+ "Toggle the debug flag used in `xquery-calculate-indentation'. "
+ (interactive)
+ (setq xquery-indent-debug (not xquery-indent-debug))
+ (message (concat "xquery-indent-debug is " (if xquery-indent-debug "en" "dis") "abled"))
+ )
+
+(defun xquery-calculate-indentation ()
+ "Return the column to which the current line should be indented."
+ (beginning-of-line)
+ (if (bobp)
+ 0 ; First line is always non-indented
+ (skip-chars-forward " \t")
+ (cond
+ ;; do nothing if this is a comment
+ ((eq (get-text-property (point) 'face) 'font-lock-comment-face) (current-indentation))
+
+ ((looking-at "\\(</?\\w\\|{\\)") ;; xml constructor or enclosed expressions
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: xml constructor"))
+ (let ((nxml-prolog-end (point-min))
+ (nxml-scan-end (copy-marker (point-min) nil)))
+ (nxml-compute-indent)
+ ))
+
+ ;; for close braces or else statements indent to the same level as the opening {
+ ((looking-at "}")
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: }"))
+ (save-excursion
+ (backward-up-list)
+ (let ((cc (current-column)))
+ (beginning-of-line)
+ (if (looking-at xquery-start-block-regexp)
+ (current-indentation)
+ cc))))
+
+ ((looking-at "else")
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: else"))
+ (save-excursion
+ (xquery-previous-non-empty-line)
+ (- (current-indentation) xquery-indent-size)
+ ))
+
+ ;; for close parens, indent to the start of the func call
+ ((looking-at ")")
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: )"))
+ (save-excursion
+ (backward-up-list)
+ (if (looking-back "\\w+\\s *")
+ (backward-word))
+ (current-column)
+ ))
+
+ ;; order flwr expressions on the same column
+ ((save-excursion
+ (when
+ (and
+ (looking-at xquery-flwr-block-regexp)
+ (progn
+ (xquery-previous-non-empty-line)
+ (beginning-of-line)
+ (looking-at xquery-flwr-block-regexp)))
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: nested flwr"))
+ (current-indentation)
+ )
+ ))
+
+ ;; if this is the first non-empty line after a block, indent xquery-indent-size chars relative to the block
+ ((save-excursion
+ (xquery-previous-non-empty-line)
+ (beginning-of-line)
+ (when (looking-at xquery-start-block-regexp)
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: first line in block"))
+ (+ xquery-indent-size (current-indentation))))
+ )
+
+ ;; for everything else indent relative to the outer list
+ (t
+ (if xquery-indent-debug
+ (message "xquery-indent-debug: everyting else"))
+ (save-excursion (xquery-previous-non-empty-line) (current-indentation)))
+ )))
+
+
+(defun xquery-previous-non-empty-line ()
+ "Move to the last non-empty line."
+ (re-search-backward "\\S " (point-min) t)
+ )
+
+(provide 'xquery-mode)
+
+;;; xquery-mode.el ends here
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