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1 ;;; xquery-mode.el --- A simple mode for editing xquery programs
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2 ;; Time-stamp: <2005-03-26 18:05:39 sacharya>
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3
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4 ;;; Copyright (C) 2005 Suraj Acharya
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5
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6 ;; Author: Suraj Acharya <sacharya@cs.indiana.edu>
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7
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8 ;; This file is not part of GNU Emacs.
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9
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10 ;; xquery-mode.el is free software; you can redistribute it
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11 ;; and/or modify it under the terms of the GNU General Public License
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12 ;; as published by the Free Software Foundation; either version 2, or
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13 ;; (at your option) any later version.:
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14
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15 ;; This software is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Commentary:
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26 ;;;
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27
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28 (require 'nxml-mode)
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29 (require 'generic-mode)
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30 ;;; Code:
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31 (define-generic-mode 'xquery-mode
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32 '(("(:" . ":)") ("!-" . "->"))
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33 '("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
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34 '(("\\(\\$\\w+\\)" 1 font-lock-variable-name-face) ;; \\(\\s_\\|\\w\\)
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35 ("\\(\\w*:?\\w+\\)\\s *(" 1 font-lock-function-name-face)
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36 ("\\(<\\)\\(/?\\)\\(\\w*\\)\\(:?\\)\\(\\w+\\).*?\\(/?\\)\\(>\\)"
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37 (1 'nxml-tag-delimiter-face)
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38 (2 'nxml-tag-slash-face)
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39 (3 'nxml-element-prefix-face)
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40 (4 'nxml-element-colon-face)
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41 (5 'nxml-element-local-name-face)
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42 (6 'nxml-tag-slash-face)
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43 (7 'nxml-tag-delimiter-face)
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44 )
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45 ("\\(\\w*\\)\\(:?\\)\\(\\w+\\)=\\([\"']\\)\\(.*?\\)\\([\"']\\)"
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46 (1 'nxml-attribute-prefix-face)
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47 (2 'nxml-attribute-colon-face)
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48 (3 'nxml-attribute-local-name-face)
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49 (4 'nxml-attribute-value-delimiter-face)
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50 (5 'nxml-attribute-value-face)
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51 (6 'nxml-attribute-value-delimiter-face))
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52 ("\\(/\\)\\(\\w*\\)\\(:?\\)\\(\\w+\\)"
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53 (1 font-lock-constant-face)
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54 (2 font-lock-constant-face)
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55 (3 font-lock-constant-face)
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56 (4 font-lock-constant-face)
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57 )
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58 ("as\\s +\\(\\w*:?\\w+\\)"
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59 (1 font-lock-type-face)
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60 )
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61 ) ;font-lock-list
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62 '(".xq[ml]?$") ;auto-mode-list
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63 '(xquery-set-indent-function xquery-set-up-syntax-table) ;function list
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64 "A Major mode for editing xquery."
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65 )
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66
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67
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68
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69 (defun xquery-set-indent-function ()
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70 "Set the indent function for xquery mode."
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71 (setq nxml-prolog-end (point-min))
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72 (setq nxml-scan-end (copy-marker (point-min) nil))
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73 (set (make-local-variable 'indent-line-function) 'xquery-indent-line)
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74 (make-local-variable 'forward-sexp-function)
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75 (setq forward-sexp-function 'xquery-forward-sexp)
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21
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76 ;;(local-set-key "/" 'nxml-electric-slash)
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15
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77 )
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78
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79 (defun xquery-forward-sexp (&optional arg)
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80 "Xquery forward s-expresssion.
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81 This function is not very smart, it tries to use
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82 `nxml-forward-balanced-item' if it sees '>' or '<' characters in
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83 the direction you are going, and uses the regular `forward-sexp'
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84 otherwise. "
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85 (if (> arg 0)
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86 (progn
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87 (if (looking-at "[ \t]*<")
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88 (nxml-forward-balanced-item arg)
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89 (let ((forward-sexp-function nil)) (forward-sexp arg))))
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90 (if (looking-back ">[ \t]*")
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91 (nxml-forward-balanced-item arg)
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92 (let ((forward-sexp-function nil)) (forward-sexp arg))))
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93 )
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94
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95
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96 (defun xquery-set-up-syntax-table ()
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97 "Allow the hypen character to be recognized as part of a xquery symbol."
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98 (modify-syntax-entry ?- "w" (syntax-table))
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99 (modify-syntax-entry ?/ "." (syntax-table))
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100 ;; set-up the syntax table correctly for parentheis type characters
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101 (modify-syntax-entry ?\{ "(}" (syntax-table))
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102 (modify-syntax-entry ?\} "){" (syntax-table))
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103 (modify-syntax-entry ?\[ "(]" (syntax-table))
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104 (modify-syntax-entry ?\] ")]" (syntax-table))
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105 (modify-syntax-entry ?\( "()1" (syntax-table))
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106 (modify-syntax-entry ?\) ")(4" (syntax-table))
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21
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107 ;;(modify-syntax-entry ?\< "(>" (syntax-table))
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108 ;;(modify-syntax-entry ?\> ")<" (syntax-table))
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109 ;; xquery comments are like (: :) -- handled above at mode decl
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110 ;;(modify-syntax-entry ?\: ".23" (syntax-table))
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111 )
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112
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113
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114
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115 (defun xquery-indent-line ()
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116 "Indent current line as xquery code."
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117 (interactive)
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118 (let ((savep (> (current-column) (current-indentation)))
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119 (indent (condition-case err (max (xquery-calculate-indentation) 0)
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120 (error (message "%S" err)))))
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121 (if savep
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122 (save-excursion (indent-line-to indent))
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123 (indent-line-to indent))))
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124
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125 (defvar xquery-start-block-regexp "[ \t]*\\((\|{\\|for\\|let\\|where\\|return\\|if\\|else\\|typeswitch\\|declare[ \t]+function\\|.*[({]$\\)"
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126 "A regular expression which indicates that a xquery block is starting.")
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127
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128 (defvar xquery-flwr-block-regexp "[ \t]*\\(for\\|let\\|where\\|return\\|order\\|stable\\s *order\\)")
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129
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130 (defvar xquery-indent-size 2
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131 "The size of each indent level.")
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132
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133 (defvar xquery-indent-debug nil)
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134
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135 (defun xquery-toggle-debug-indent ()
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136 "Toggle the debug flag used in `xquery-calculate-indentation'. "
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137 (interactive)
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138 (setq xquery-indent-debug (not xquery-indent-debug))
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139 (message (concat "xquery-indent-debug is " (if xquery-indent-debug "en" "dis") "abled"))
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140 )
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141
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142 (defun xquery-calculate-indentation ()
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143 "Return the column to which the current line should be indented."
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144 (beginning-of-line)
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145 (if (bobp)
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146 0 ; First line is always non-indented
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147 (skip-chars-forward " \t")
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148 (cond
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149 ;; do nothing if this is a comment
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150 ((eq (get-text-property (point) 'face) 'font-lock-comment-face) (current-indentation))
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151
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152 ((looking-at "\\(</?\\w\\|{\\)") ;; xml constructor or enclosed expressions
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153 (if xquery-indent-debug
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154 (message "xquery-indent-debug: xml constructor"))
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155 (let ((nxml-prolog-end (point-min))
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156 (nxml-scan-end (copy-marker (point-min) nil)))
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157 (nxml-compute-indent)
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158 ))
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159
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160 ;; for close braces or else statements indent to the same level as the opening {
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161 ((looking-at "}")
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162 (if xquery-indent-debug
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163 (message "xquery-indent-debug: }"))
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164 (save-excursion
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165 (backward-up-list)
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166 (let ((cc (current-column)))
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167 (beginning-of-line)
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168 (if (looking-at xquery-start-block-regexp)
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169 (current-indentation)
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170 cc))))
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171
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172 ((looking-at "else")
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173 (if xquery-indent-debug
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174 (message "xquery-indent-debug: else"))
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175 (save-excursion
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176 (xquery-previous-non-empty-line)
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177 (- (current-indentation) xquery-indent-size)
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178 ))
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179
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180 ;; for close parens, indent to the start of the func call
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181 ((looking-at ")")
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182 (if xquery-indent-debug
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183 (message "xquery-indent-debug: )"))
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184 (save-excursion
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185 (backward-up-list)
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186 (if (looking-back "\\w+\\s *")
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187 (backward-word))
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188 (current-column)
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189 ))
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190
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191 ;; order flwr expressions on the same column
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192 ((save-excursion
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193 (when
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194 (and
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195 (looking-at xquery-flwr-block-regexp)
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196 (progn
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197 (xquery-previous-non-empty-line)
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198 (beginning-of-line)
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199 (looking-at xquery-flwr-block-regexp)))
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200 (if xquery-indent-debug
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201 (message "xquery-indent-debug: nested flwr"))
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202 (current-indentation)
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203 )
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204 ))
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205
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206 ;; if this is the first non-empty line after a block, indent xquery-indent-size chars relative to the block
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207 ((save-excursion
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208 (xquery-previous-non-empty-line)
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209 (beginning-of-line)
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210 (when (looking-at xquery-start-block-regexp)
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211 (if xquery-indent-debug
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212 (message "xquery-indent-debug: first line in block"))
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213 (+ xquery-indent-size (current-indentation))))
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214 )
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215
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216 ;; for everything else indent relative to the outer list
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217 (t
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218 (if xquery-indent-debug
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219 (message "xquery-indent-debug: everyting else"))
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220 (save-excursion (xquery-previous-non-empty-line) (current-indentation)))
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221 )))
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222
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21
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223 (when (featurep 'xemacs)
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224 (unless (functionp 'looking-back)
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225 ;; from GNU Emacs subr.el
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226 (defun looking-back (regexp &optional limit greedy)
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227 "Return non-nil if text before point matches regular expression
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228 REGEXP.
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229 Like `looking-at' except matches before point, and is slower.
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230 LIMIT if non-nil speeds up the search by specifying a minimum
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231 starting position, to avoid checking matches that would start
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232 before LIMIT.
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233 If GREEDY is non-nil, extend the match backwards as far as possible,
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234 stopping when a single additional previous character cannot be part
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235 of a match for REGEXP."
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236 (let ((start (point))
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237 (pos
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238 (save-excursion
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239 (and (re-search-backward (concat "\\(?:" regexp
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240 "\\)\\=") limit t)
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241 (point)))))
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242 (if (and greedy pos)
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243 (save-restriction
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244 (narrow-to-region (point-min) start)
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245 (while (and (> pos (point-min))
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246 (save-excursion
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247 (goto-char pos)
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248 (backward-char 1)
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249 (looking-at (concat "\\(?:" regexp
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250 "\\)\\'"))))
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251 (setq pos (1- pos)))
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252 (save-excursion
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253 (goto-char pos)
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254 (looking-at (concat "\\(?:" regexp "\\)\\'")))))
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255 (not (null pos))))))
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256
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257 (defun xquery-previous-non-empty-line ()
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258 "Move to the last non-empty line."
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259 (re-search-backward "\\S " (point-min) t)
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260 )
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261
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262 (provide 'xquery-mode)
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263
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264 ;;; xquery-mode.el ends here
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