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1 ;;; vrml-mode.el --- major mode for editing VRML (.wrl) files
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2
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3 ;; Copyright (C) 1994 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1996 Ben Wing.
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5
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6 ;; Author: Ben Wing <wing@666.com>
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7 ;; Keywords: languages vrml modes
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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16
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Synched up with: Not in FSF.
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27
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28 ;;; Commentary:
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29
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30 ;; Mostly bastardized from tcl.el.
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31
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32 ;; HOW TO INSTALL:
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33 ;; Put the following forms in your .emacs to enable autoloading of VRML
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34 ;; mode, and auto-recognition of ".wrl" files.
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35 ;;
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36 ;; (autoload 'vrml-mode "vrml" "VRML mode." t)
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37 ;; (setq auto-mode-alist (append '(("\\.wrl\\'" . vrml-mode))
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38 ;; auto-mode-alist))
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39 ;;
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40
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41 ;;; Code:
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42
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43 ;;
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44 ;; User variables.
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45 ;;
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46
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47 (defvar vrml-indent-level 3
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48 "*Indentation of VRML statements with respect to containing block.")
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49
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50 (defvar vrml-auto-newline nil
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51 "*Non-nil means automatically newline before and after braces
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52 inserted in VRML code.")
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53
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54 (defvar vrml-tab-always-indent t
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55 "*Control effect of TAB key.
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56 If t (the default), always indent current line.
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57 If nil and point is not in the indentation area at the beginning of
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58 the line, a TAB is inserted.
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59 Other values cause the first possible action from the following list
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60 to take place:
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61
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62 1. Move from beginning of line to correct indentation.
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63 2. Delete an empty comment.
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64 3. Move forward to start of comment, indenting if necessary.
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65 4. Move forward to end of line, indenting if necessary.
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66 5. Create an empty comment.
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67 6. Move backward to start of comment, indenting if necessary.")
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68
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69 (defvar vrml-use-hairy-comment-detector t
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70 "*If not `nil', then the more complicated, but slower, comment
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71 detecting function is used.")
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72
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73 (defvar vrml-mode-abbrev-table nil
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74 "Abbrev table used while in VRML mode.")
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75 (define-abbrev-table 'vrml-mode-abbrev-table ())
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76
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77 (defvar vrml-mode-map ()
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78 "Keymap used in VRML mode.")
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79 (if (null vrml-mode-map)
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80 (progn
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81 (setq vrml-mode-map (make-sparse-keymap))
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82 (set-keymap-name vrml-mode-map 'vrml-mode-map)
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83 (define-key vrml-mode-map "{" 'vrml-electric-brace)
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84 (define-key vrml-mode-map "}" 'vrml-electric-brace)
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85 (define-key vrml-mode-map "\e\C-q" 'indent-vrml-exp)
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86 (define-key vrml-mode-map "\177" 'backward-delete-char-untabify)
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87 (define-key vrml-mode-map "\t" 'vrml-indent-command)
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88 (define-key vrml-mode-map "\M-;" 'vrml-indent-for-comment)
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89 ))
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90
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91 (defvar vrml-mode-syntax-table nil
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92 "Syntax table in use in vrml-mode buffers.")
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93
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94 (if vrml-mode-syntax-table
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95 ()
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96 (setq vrml-mode-syntax-table (make-syntax-table))
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97 (modify-syntax-entry ?\n ">" vrml-mode-syntax-table)
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98 (modify-syntax-entry ?\f ">" vrml-mode-syntax-table)
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99 (modify-syntax-entry ?\# "<" vrml-mode-syntax-table)
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100 (modify-syntax-entry ?\\ "\\" vrml-mode-syntax-table)
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101 (modify-syntax-entry ?% "_" vrml-mode-syntax-table)
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102 (modify-syntax-entry ?@ "_" vrml-mode-syntax-table)
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103 (modify-syntax-entry ?& "_" vrml-mode-syntax-table)
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104 (modify-syntax-entry ?* "_" vrml-mode-syntax-table)
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105 (modify-syntax-entry ?- "_" vrml-mode-syntax-table)
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106 (modify-syntax-entry ?: "_" vrml-mode-syntax-table)
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107 (modify-syntax-entry ?! "_" vrml-mode-syntax-table)
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108 (modify-syntax-entry ?$ "_" vrml-mode-syntax-table)
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109 (modify-syntax-entry ?/ "_" vrml-mode-syntax-table)
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110 (modify-syntax-entry ?~ "_" vrml-mode-syntax-table)
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111 (modify-syntax-entry ?< "_" vrml-mode-syntax-table)
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112 (modify-syntax-entry ?= "_" vrml-mode-syntax-table)
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113 (modify-syntax-entry ?> "_" vrml-mode-syntax-table)
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114 (modify-syntax-entry ?| "_" vrml-mode-syntax-table)
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115 (modify-syntax-entry ?+ "." vrml-mode-syntax-table)
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116 (modify-syntax-entry ?\' "\"" vrml-mode-syntax-table))
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117
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118 (defvar vrml-mode-hook nil
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119 "Hook run on entry to VRML mode.")
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120
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121 (defvar vrml-keyword-list
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122 '(
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123 ; shape nodes:
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124 "AsciiText" "Cone" "Cube" "Cylinder" "IndexedFaceSet" "IndexedLineSet"
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125 "PointSet" "Sphere"
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126 ; geometry and material nodes:
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127 "Coordinate3" "FontStyle" "Info" "LOD" "Material" "MaterialBinding"
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128 "Normal" "NormalBinding" "Texture2" "Texture2Transform"
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129 "TextureCoordinate2" "ShapeHints"
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130 ; transformation nodes:
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131 "MatrixTransform" "Rotation" "Scale" "Transform" "Translation"
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132 ;camera nodes:
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133 "OrthographicCamera" "PerspectiveCamera"
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134 ;lighting nodes:
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135 "DirectionalLight" "PointLight" "SpotLight"
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136 ;group nodes:
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137 "Group" "Separator" "Switch" "TransformSeparator" "WWWAnchor"
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138 ;other:
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139 "WWWInline"
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140 ;new VRML 2.0 nodes (#### not yet classified)
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141 "Anchor" "Appearance" "AudioClip" "Background" "Billboard" "Box"
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142 "Collision" "Color" "ColorInterpolator" "Coordinate"
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143 "CoordinateInterpolator" "CylinderSensor" "DiskSensor" "ElevationGrid"
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144 "Extrusion" "Fog" "FontStyle" "ImageTexture" "Inline" "MovieTexture"
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145 "NavigationInfo" "NormalInterpolator" "OrientationInterpolator"
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146 "PixelTexture" "PlaneSensor" "PositionInterpolator" "ProximitySensor"
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147 "ScalarInterpolator" "Script" "Shape" "Sound" "SphereSensor" "Text"
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148 "TextureTransform" "TextureCoordinate" "TimeSensor" "TouchSensor"
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149 "Viewpoint" "VisibilitySensor" "WorldInfo"
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150 ;VRML 2.0 node fields
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151 "eventIn" "eventOut" "field" "exposedField"
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152 ;misc. VRML 2.0 keywords (DEF, PROTO, EXTERNPROTO handled below)
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153 "USE" "ROUTE" "TO" "IS" "TRUE" "FALSE" "NULL"
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154 ))
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155
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156 (defconst vrml-font-lock-keywords
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157 (list
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158 ;; Names of functions (and other "defining things").
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159 (list "\\(DEF\\|PROTO\\|EXTERNPROTO\\)[ \t\n]+\\([^ \t\n]+\\)"
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160 2 'font-lock-function-name-face)
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161
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162 ;; Keywords. Only recognized if surrounded by whitespace.
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163 ;; FIXME consider using "not word or symbol", not
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164 ;; "whitespace".
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165 (cons (concat "\\(\\s-\\|^\\)\\("
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166 ;; FIXME Use regexp-quote?
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167 (mapconcat 'identity vrml-keyword-list "\\|")
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168 "\\)\\(\\s-\\|$\\)")
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169 2)
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170 )
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171 "Keywords to highlight for VRML. See variable `font-lock-keywords'.")
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172
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173 ;;;###autoload
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174 (defun vrml-mode ()
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175 "Major mode for editing VRML code.
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176 Expression and list commands understand all VRML brackets.
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177 Tab indents for VRML code.
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178 Paragraphs are separated by blank lines only.
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179 Delete converts tabs to spaces as it moves back.
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180
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181 Variables controlling indentation style:
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182 vrml-indent-level
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183 Indentation of VRML statements within surrounding block.
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184
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185 Variables controlling user interaction with mode (see variable
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186 documentation for details):
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187 vrml-tab-always-indent
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188 Controls action of TAB key.
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189 vrml-auto-newline
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190 Non-nil means automatically newline before and after braces
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191 inserted in VRML code.
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192
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193 Turning on VRML mode calls the value of the variable `vrml-mode-hook'
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194 with no args, if that value is non-nil. Read the documentation for
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195 `vrml-mode-hook' to see what kinds of interesting hook functions
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196 already exist.
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197
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198 Commands:
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199 \\{vrml-mode-map}"
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200 (interactive)
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201 (kill-all-local-variables)
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202 (use-local-map vrml-mode-map)
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203 (setq major-mode 'vrml-mode)
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204 (setq mode-name "VRML")
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205 (setq local-abbrev-table vrml-mode-abbrev-table)
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206 (set-syntax-table vrml-mode-syntax-table)
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207
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208 (make-local-variable 'paragraph-start)
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209 (make-local-variable 'paragraph-separate)
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210 (if (fboundp 'move-to-left-margin)
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211 (progn
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212 ;; In FSF Emacs 19.29 / XEmacs 19.14, you aren't supposed to
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213 ;; start these with a ^.
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214 (setq paragraph-start "$\\| ")
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215 (setq paragraph-separate paragraph-start))
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216 (setq paragraph-start (concat "^$\\|" page-delimiter))
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217 (setq paragraph-separate paragraph-start))
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218 (make-local-variable 'paragraph-ignore-fill-prefix)
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219 (setq paragraph-ignore-fill-prefix t)
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220 (make-local-variable 'fill-paragraph-function)
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221 (setq fill-paragraph-function 'vrml-do-fill-paragraph)
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222
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223 (make-local-variable 'indent-line-function)
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224 (setq indent-line-function 'vrml-indent-line)
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225 (make-local-variable 'require-final-newline)
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226 (setq require-final-newline t)
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227
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228 (make-local-variable 'comment-start)
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229 (setq comment-start "# ")
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230 (make-local-variable 'comment-start-skip)
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231 (setq comment-start-skip "#+ *")
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232 (make-local-variable 'comment-column)
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233 (setq comment-column 40)
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234 (make-local-variable 'comment-end)
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235 (setq comment-end "")
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236
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237 (make-local-variable 'outline-regexp)
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238 (setq outline-regexp "[^\n\^M]")
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239 (make-local-variable 'outline-level)
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240 (setq outline-level 'vrml-outline-level)
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241
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242 (make-local-variable 'font-lock-keywords)
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243 (setq font-lock-keywords vrml-font-lock-keywords)
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244
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245 (make-local-variable 'parse-sexp-ignore-comments)
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246 (setq parse-sexp-ignore-comments t)
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247
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248 (make-local-variable 'defun-prompt-regexp)
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249 (setq defun-prompt-regexp "^[^ \t\n#}][^\n}]+}*[ \t]+")
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250
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251 ;; Settings for new dabbrev code.
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252 (make-local-variable 'dabbrev-case-fold-search)
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253 (setq dabbrev-case-fold-search nil)
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254 (make-local-variable 'dabbrev-case-replace)
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255 (setq dabbrev-case-replace nil)
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256 (make-local-variable 'dabbrev-abbrev-skip-leading-regexp)
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257 (setq dabbrev-abbrev-skip-leading-regexp "[$!]")
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258 (make-local-variable 'dabbrev-abbrev-char-regexp)
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259 (setq dabbrev-abbrev-char-regexp "\\sw\\|\\s_")
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260
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261 (run-hooks 'vrml-mode-hook))
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262
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263 ;; This is used for closing braces. If vrml-auto-newline is set, can
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264 ;; insert a newline both before and after the brace, depending on
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265 ;; context. FIXME should this be configurable? Does anyone use this?
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266 (defun vrml-electric-brace (arg)
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267 "Insert character and correct line's indentation."
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268 (interactive "p")
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269 ;; If auto-newlining and there is stuff on the same line, insert a
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270 ;; newline first.
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271 (if vrml-auto-newline
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272 (progn
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273 (if (save-excursion
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274 (skip-chars-backward " \t")
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275 (bolp))
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276 ()
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277 (vrml-indent-line)
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278 (newline))
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279 ;; In auto-newline case, must insert a newline after each
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280 ;; brace. So an explicit loop is needed.
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281 (while (> arg 0)
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282 (insert last-command-char)
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283 (vrml-indent-line)
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284 (newline)
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285 (setq arg (1- arg))))
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286 (self-insert-command arg))
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287 (vrml-indent-line))
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288
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289
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290
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291 (defun vrml-indent-command (&optional arg)
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292 "Indent current line as VRML code, or in some cases insert a tab character.
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293 If vrml-tab-always-indent is t (the default), always indent current line.
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294 If vrml-tab-always-indent is nil and point is not in the indentation
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295 area at the beginning of the line, a TAB is inserted.
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296 Other values of vrml-tab-always-indent cause the first possible action
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297 from the following list to take place:
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298
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299 1. Move from beginning of line to correct indentation.
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300 2. Delete an empty comment.
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301 3. Move forward to start of comment, indenting if necessary.
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302 4. Move forward to end of line, indenting if necessary.
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303 5. Create an empty comment.
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304 6. Move backward to start of comment, indenting if necessary."
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305 (interactive "p")
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306 (cond
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307 ((not vrml-tab-always-indent)
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308 ;; Indent if in indentation area, otherwise insert TAB.
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309 (if (<= (current-column) (current-indentation))
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310 (vrml-indent-line)
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311 (self-insert-command arg)))
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312 ((eq vrml-tab-always-indent t)
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313 ;; Always indent.
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314 (vrml-indent-line))
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315 (t
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316 ;; "Perl-mode" style TAB command.
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317 (let* ((ipoint (point))
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318 (eolpoint (progn
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319 (end-of-line)
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320 (point)))
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321 (comment-p (vrml-in-comment)))
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322 (cond
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323 ((= ipoint (save-excursion
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324 (beginning-of-line)
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325 (point)))
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326 (beginning-of-line)
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327 (vrml-indent-line)
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328 ;; If indenting didn't leave us in column 0, go to the
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329 ;; indentation. Otherwise leave point at end of line. This
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330 ;; is a hack.
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331 (if (= (point) (save-excursion
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332 (beginning-of-line)
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333 (point)))
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334 (end-of-line)
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335 (back-to-indentation)))
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336 ((and comment-p (looking-at "[ \t]*$"))
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337 ;; Empty comment, so delete it. We also delete any ";"
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338 ;; characters at the end of the line. I think this is
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339 ;; friendlier, but I don't know how other people will feel.
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340 (backward-char)
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341 (skip-chars-backward " \t;")
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342 (delete-region (point) eolpoint))
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343 ((and comment-p (< ipoint (point)))
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344 ;; Before comment, so skip to it.
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345 (vrml-indent-line)
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346 (indent-for-comment))
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347 ((/= ipoint eolpoint)
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348 ;; Go to end of line (since we're not there yet).
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349 (goto-char eolpoint)
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350 (vrml-indent-line))
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351 ((not comment-p)
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352 (vrml-indent-line)
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353 (vrml-indent-for-comment))
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354 (t
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355 ;; Go to start of comment. We don't leave point where it is
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356 ;; because we want to skip comment-start-skip.
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357 (vrml-indent-line)
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358 (indent-for-comment)))))))
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359
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360 (defun vrml-indent-line ()
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361 "Indent current line as VRML code.
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362 Return the amount the indentation changed by."
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363 (let ((indent (calculate-vrml-indent nil))
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364 beg shift-amt
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365 (case-fold-search nil)
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366 (pos (- (point-max) (point))))
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367 (beginning-of-line)
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368 (setq beg (point))
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369 (cond ((eq indent nil)
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370 (setq indent (current-indentation)))
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371 (t
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372 (skip-chars-forward " \t")
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373 (if (listp indent) (setq indent (car indent)))
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374 (cond ((= (following-char) ?})
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375 (setq indent (- indent vrml-indent-level)))
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376 ((= (following-char) ?\])
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377 (setq indent (- indent 1))))))
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378 (skip-chars-forward " \t")
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379 (setq shift-amt (- indent (current-column)))
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380 (if (zerop shift-amt)
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381 (if (> (- (point-max) pos) (point))
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382 (goto-char (- (point-max) pos)))
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383 (delete-region beg (point))
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384 (indent-to indent)
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385 ;; If initial point was within line's indentation,
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386 ;; position after the indentation. Else stay at same point in text.
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387 (if (> (- (point-max) pos) (point))
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388 (goto-char (- (point-max) pos))))
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389 shift-amt))
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390
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391 (defun calculate-vrml-indent (&optional parse-start)
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392 "Return appropriate indentation for current line as VRML code.
|
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393 In usual case returns an integer: the column to indent to.
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394 Returns nil if line starts inside a string, t if in a comment."
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395 (save-excursion
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396 (beginning-of-line)
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397 (let* ((indent-point (point))
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398 (case-fold-search nil)
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399 state
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400 containing-sexp
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401 found-next-line)
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402 (if parse-start
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403 (goto-char parse-start)
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404 (beginning-of-defun))
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405 (while (< (point) indent-point)
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406 (setq parse-start (point))
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407 (setq state (parse-partial-sexp (point) indent-point 0))
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408 (setq containing-sexp (car (cdr state))))
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409 (cond ((or (nth 3 state) (nth 4 state))
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410 ;; Inside comment or string. Return nil or t if should
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411 ;; not change this line
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412 (nth 4 state))
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413 ((null containing-sexp)
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414 ;; Line is at top level.
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415 0)
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416 (t
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417 (goto-char containing-sexp)
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418 (let* ((expr-start (point)))
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419 ;; Find the first statement in the block and indent
|
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420 ;; like it. The first statement in the block might be
|
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421 ;; on the same line, so what we do is skip all
|
|
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422 ;; "virtually blank" lines, looking for a non-blank
|
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423 ;; one. A line is virtually blank if it only contains
|
|
|
424 ;; a comment and whitespace. We do it this funky way
|
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|
425 ;; because we want to know if we've found a statement
|
|
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426 ;; on some line _after_ the line holding the sexp
|
|
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427 ;; opener.
|
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428 (goto-char containing-sexp)
|
|
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429 (forward-char)
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|
430 (if (and (< (point) indent-point)
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431 (looking-at "[ \t]*\\(#.*\\)?$"))
|
|
|
432 (progn
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|
|
433 (forward-line)
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434 (while (and (< (point) indent-point)
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435 (looking-at "[ \t]*\\(#.*\\)?$"))
|
|
|
436 (setq found-next-line t)
|
|
|
437 (forward-line))))
|
|
|
438 (if (not (or (= (char-after containing-sexp) ?{)
|
|
|
439 (and (= (char-after containing-sexp) ?\[)
|
|
|
440 (save-excursion
|
|
|
441 (goto-char containing-sexp)
|
|
|
442 (skip-chars-backward " \t\n")
|
|
|
443 (forward-char -8)
|
|
|
444 (looking-at "children")))))
|
|
|
445 (progn
|
|
|
446 ;; Line is continuation line, or the sexp opener
|
|
2
|
447 ;; is not a curly brace, or we are looking at
|
|
0
|
448 ;; an `expr' expression (which must be split
|
|
|
449 ;; specially). So indentation is column of first
|
|
|
450 ;; good spot after sexp opener. If there is no
|
|
|
451 ;; nonempty line before the indentation point, we
|
|
|
452 ;; use the column of the character after the sexp
|
|
|
453 ;; opener.
|
|
|
454 (if (>= (point) indent-point)
|
|
|
455 (progn
|
|
|
456 (goto-char containing-sexp)
|
|
|
457 (forward-char))
|
|
|
458 (skip-chars-forward " \t"))
|
|
|
459 (current-column))
|
|
|
460 ;; After a curly brace, and not a continuation line.
|
|
|
461 ;; So take indentation from first good line after
|
|
|
462 ;; start of block, unless that line is on the same
|
|
|
463 ;; line as the opening brace. In this case use the
|
|
|
464 ;; indentation of the opening brace's line, plus
|
|
|
465 ;; another indent step. If we are in the body part
|
|
|
466 ;; of an "if" or "while" then the indentation is
|
|
|
467 ;; taken from the line holding the start of the
|
|
|
468 ;; statement.
|
|
|
469 (if (and (< (point) indent-point)
|
|
|
470 found-next-line)
|
|
|
471 (current-indentation)
|
|
|
472 (if t ; commands-p
|
|
|
473 (goto-char expr-start)
|
|
|
474 (goto-char containing-sexp))
|
|
|
475 (+ (current-indentation) vrml-indent-level)))))))))
|
|
|
476
|
|
|
477
|
|
|
478
|
|
|
479 (defun indent-vrml-exp ()
|
|
|
480 "Indent each line of the VRML grouping following point."
|
|
|
481 (interactive)
|
|
|
482 (let ((indent-stack (list nil))
|
|
|
483 (contain-stack (list (point)))
|
|
|
484 (case-fold-search nil)
|
|
|
485 outer-loop-done inner-loop-done state ostate
|
|
|
486 this-indent last-sexp
|
|
|
487 (next-depth 0)
|
|
|
488 last-depth)
|
|
|
489 (save-excursion
|
|
|
490 (forward-sexp 1))
|
|
|
491 (save-excursion
|
|
|
492 (setq outer-loop-done nil)
|
|
|
493 (while (and (not (eobp)) (not outer-loop-done))
|
|
|
494 (setq last-depth next-depth)
|
|
|
495 ;; Compute how depth changes over this line
|
|
|
496 ;; plus enough other lines to get to one that
|
|
|
497 ;; does not end inside a comment or string.
|
|
|
498 ;; Meanwhile, do appropriate indentation on comment lines.
|
|
|
499 (setq inner-loop-done nil)
|
|
|
500 (while (and (not inner-loop-done)
|
|
|
501 (not (and (eobp) (setq outer-loop-done t))))
|
|
|
502 (setq ostate state)
|
|
|
503 (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
|
|
|
504 nil nil state))
|
|
|
505 (setq next-depth (car state))
|
|
|
506 (if (and (car (cdr (cdr state)))
|
|
|
507 (>= (car (cdr (cdr state))) 0))
|
|
|
508 (setq last-sexp (car (cdr (cdr state)))))
|
|
|
509 (if (or (nth 4 ostate))
|
|
|
510 (vrml-indent-line))
|
|
|
511 (if (or (nth 3 state))
|
|
|
512 (forward-line 1)
|
|
|
513 (setq inner-loop-done t)))
|
|
|
514 (if (<= next-depth 0)
|
|
|
515 (setq outer-loop-done t))
|
|
|
516 (if outer-loop-done
|
|
|
517 nil
|
|
|
518 ;; If this line had ..))) (((.. in it, pop out of the levels
|
|
|
519 ;; that ended anywhere in this line, even if the final depth
|
|
|
520 ;; doesn't indicate that they ended.
|
|
|
521 (while (> last-depth (nth 6 state))
|
|
|
522 (setq indent-stack (cdr indent-stack)
|
|
|
523 contain-stack (cdr contain-stack)
|
|
|
524 last-depth (1- last-depth)))
|
|
|
525 (if (/= last-depth next-depth)
|
|
|
526 (setq last-sexp nil))
|
|
|
527 ;; Add levels for any parens that were started in this line.
|
|
|
528 (while (< last-depth next-depth)
|
|
|
529 (setq indent-stack (cons nil indent-stack)
|
|
|
530 contain-stack (cons nil contain-stack)
|
|
|
531 last-depth (1+ last-depth)))
|
|
|
532 (if (null (car contain-stack))
|
|
|
533 (setcar contain-stack
|
|
|
534 (or (car (cdr state))
|
|
|
535 (save-excursion
|
|
|
536 (forward-sexp -1)
|
|
|
537 (point)))))
|
|
|
538 (forward-line 1)
|
|
|
539 (skip-chars-forward " \t")
|
|
|
540 (if (eolp)
|
|
|
541 nil
|
|
|
542 (if (and (car indent-stack)
|
|
|
543 (>= (car indent-stack) 0))
|
|
|
544 ;; Line is on an existing nesting level.
|
|
|
545 (setq this-indent (car indent-stack))
|
|
|
546 ;; Just started a new nesting level.
|
|
|
547 ;; Compute the standard indent for this level.
|
|
|
548 (let ((val (calculate-vrml-indent
|
|
|
549 (if (car indent-stack)
|
|
|
550 (- (car indent-stack))))))
|
|
|
551 (setcar indent-stack
|
|
|
552 (setq this-indent val))
|
|
|
553 ))
|
|
|
554 (cond ((not (numberp this-indent)))
|
|
|
555 ((= (following-char) ?})
|
|
|
556 (setq this-indent (- this-indent vrml-indent-level)))
|
|
|
557 ((= (following-char) ?\])
|
|
|
558 (setq this-indent (- this-indent 1))))
|
|
|
559 ;; Put chosen indentation into effect.
|
|
|
560 (or (null this-indent)
|
|
|
561 (= (current-column)
|
|
|
562 this-indent)
|
|
|
563 (progn
|
|
|
564 (delete-region (point) (progn (beginning-of-line) (point)))
|
|
|
565 (indent-to
|
|
|
566 this-indent))))))))
|
|
|
567 )
|
|
|
568
|
|
|
569 ;;
|
|
|
570 ;; Auto-fill support.
|
|
|
571 ;;
|
|
|
572
|
|
|
573 (defun vrml-real-command-p ()
|
|
|
574 "Return nil if point is not at the beginning of a command.
|
|
|
575 A command is the first word on an otherwise empty line, or the
|
|
|
576 first word following an opening brace."
|
|
|
577 (save-excursion
|
|
|
578 (skip-chars-backward " \t")
|
|
|
579 (cond
|
|
|
580 ((bobp) t)
|
|
|
581 ((bolp)
|
|
|
582 (backward-char)
|
|
|
583 ;; Note -- continued comments are not supported here. I
|
|
|
584 ;; consider those to be a wart on the language.
|
|
|
585 (not (eq ?\\ (preceding-char))))
|
|
|
586 (t
|
|
|
587 (memq (preceding-char) '(?{))))))
|
|
|
588
|
|
|
589 ;; FIXME doesn't actually return t. See last case.
|
|
|
590 (defun vrml-real-comment-p ()
|
|
|
591 "Return t if point is just after the `#' beginning a real comment.
|
|
|
592 Does not check to see if previous char is actually `#'.
|
|
|
593 A real comment is either at the beginning of the buffer,
|
|
30
|
594 preceded only by whitespace on the line, or has a preceding
|
|
0
|
595 semicolon, opening brace, or opening bracket on the same line."
|
|
|
596 (save-excursion
|
|
|
597 (backward-char)
|
|
|
598 (vrml-real-command-p)))
|
|
|
599
|
|
|
600 (defun vrml-hairy-scan-for-comment (state end always-stop)
|
|
|
601 "Determine if point is in a comment.
|
|
|
602 Returns a list of the form `(FLAG . STATE)'. STATE can be used
|
|
|
603 as input to future invocations. FLAG is nil if not in comment,
|
|
|
604 t otherwise. If in comment, leaves point at beginning of comment.
|
|
|
605 See also `vrml-simple-scan-for-comment', a simpler version that is
|
|
|
606 often right."
|
|
|
607 (let ((bol (save-excursion
|
|
|
608 (goto-char end)
|
|
|
609 (beginning-of-line)
|
|
|
610 (point)))
|
|
|
611 real-comment
|
|
|
612 last-cstart)
|
|
|
613 (while (and (not last-cstart) (< (point) end))
|
|
|
614 (setq real-comment nil) ;In case we've looped around and it is
|
|
|
615 ;set.
|
|
|
616 (setq state (parse-partial-sexp (point) end nil nil state t))
|
|
|
617 (if (nth 4 state)
|
|
|
618 (progn
|
|
|
619 ;; If ALWAYS-STOP is set, stop even if we don't have a
|
|
|
620 ;; real comment, or if the comment isn't on the same line
|
|
|
621 ;; as the end.
|
|
|
622 (if always-stop (setq last-cstart (point)))
|
|
|
623 ;; If we have a real comment, then set the comment
|
|
|
624 ;; starting point if we are on the same line as the ending
|
|
|
625 ;; location.
|
|
|
626 (setq real-comment (vrml-real-comment-p))
|
|
|
627 (if real-comment
|
|
|
628 (progn
|
|
|
629 (and (> (point) bol) (setq last-cstart (point)))
|
|
|
630 ;; NOTE Emacs 19 has a misfeature whereby calling
|
|
|
631 ;; parse-partial-sexp with COMMENTSTOP set and with
|
|
|
632 ;; an initial list that says point is in a comment
|
|
|
633 ;; will cause an immediate return. So we must skip
|
|
|
634 ;; over the comment ourselves.
|
|
|
635 (beginning-of-line 2)))
|
|
|
636 ;; Frob the state to make it look like we aren't in a
|
|
|
637 ;; comment.
|
|
|
638 (setcar (nthcdr 4 state) nil))))
|
|
|
639 (and last-cstart
|
|
|
640 (goto-char last-cstart))
|
|
|
641 (cons real-comment state)))
|
|
|
642
|
|
|
643 (defun vrml-hairy-in-comment ()
|
|
|
644 "Return t if point is in a comment, and leave point at beginning
|
|
|
645 of comment."
|
|
|
646 (let ((save (point)))
|
|
|
647 (beginning-of-defun)
|
|
|
648 (car (vrml-hairy-scan-for-comment nil save nil))))
|
|
|
649
|
|
|
650 (defun vrml-simple-in-comment ()
|
|
|
651 "Return t if point is in comment, and leave point at beginning
|
|
|
652 of comment. This is faster than `vrml-hairy-in-comment', but is
|
|
|
653 correct less often."
|
|
|
654 (let ((save (point))
|
|
|
655 comment)
|
|
|
656 (beginning-of-line)
|
|
|
657 (while (and (< (point) save) (not comment))
|
|
|
658 (search-forward "#" save 'move)
|
|
|
659 (setq comment (vrml-real-comment-p)))
|
|
|
660 comment))
|
|
|
661
|
|
|
662 (defun vrml-in-comment ()
|
|
|
663 "Return t if point is in comment, and leave point at beginning
|
|
|
664 of comment."
|
|
|
665 (if vrml-use-hairy-comment-detector
|
|
|
666 (vrml-hairy-in-comment)
|
|
|
667 (vrml-simple-in-comment)))
|
|
|
668
|
|
|
669 (defun vrml-do-fill-paragraph (ignore)
|
|
|
670 "fill-paragraph function for VRML mode. Only fills in a comment."
|
|
|
671 (let (in-comment col where)
|
|
|
672 (save-excursion
|
|
|
673 (end-of-line)
|
|
|
674 (setq in-comment (vrml-in-comment))
|
|
|
675 (if in-comment
|
|
|
676 (progn
|
|
|
677 (setq where (1+ (point)))
|
|
|
678 (setq col (1- (current-column))))))
|
|
|
679 (and in-comment
|
|
|
680 (save-excursion
|
|
|
681 (back-to-indentation)
|
|
|
682 (= col (current-column)))
|
|
|
683 ;; In a comment. Set the fill prefix, and find the paragraph
|
|
|
684 ;; boundaries by searching for lines that look like
|
|
|
685 ;; comment-only lines.
|
|
|
686 (let ((fill-prefix (buffer-substring (progn
|
|
|
687 (beginning-of-line)
|
|
|
688 (point))
|
|
|
689 where))
|
|
|
690 p-start p-end)
|
|
|
691 ;; Search backwards.
|
|
|
692 (save-excursion
|
|
|
693 (while (looking-at "^[ \t]*#")
|
|
|
694 (forward-line -1))
|
|
|
695 (forward-line)
|
|
|
696 (setq p-start (point)))
|
|
|
697
|
|
|
698 ;; Search forwards.
|
|
|
699 (save-excursion
|
|
|
700 (while (looking-at "^[ \t]*#")
|
|
|
701 (forward-line))
|
|
|
702 (setq p-end (point)))
|
|
|
703
|
|
|
704 ;; Narrow and do the fill.
|
|
|
705 (save-restriction
|
|
|
706 (narrow-to-region p-start p-end)
|
|
|
707 (fill-paragraph ignore)))))
|
|
|
708 t)
|
|
|
709
|
|
|
710 (defun vrml-do-auto-fill ()
|
|
|
711 "Auto-fill function for VRML mode. Only auto-fills in a comment."
|
|
|
712 (if (> (current-column) fill-column)
|
|
|
713 (let ((fill-prefix "# ")
|
|
|
714 in-comment col)
|
|
|
715 (save-excursion
|
|
|
716 (setq in-comment (vrml-in-comment))
|
|
|
717 (if in-comment
|
|
|
718 (setq col (1- (current-column)))))
|
|
|
719 (if in-comment
|
|
|
720 (progn
|
|
|
721 (do-auto-fill)
|
|
|
722 (save-excursion
|
|
|
723 (back-to-indentation)
|
|
|
724 (delete-region (point) (save-excursion
|
|
|
725 (beginning-of-line)
|
|
|
726 (point)))
|
|
|
727 (indent-to-column col)))))))
|
|
|
728
|
|
|
729 (defun vrml-indent-for-comment ()
|
|
|
730 "Indent this line's comment to comment column, or insert an empty comment.
|
|
|
731 Is smart about syntax of VRML comments.
|
|
|
732 Parts of this were taken from indent-for-comment (simple.el)."
|
|
|
733 (interactive "*")
|
|
|
734 (end-of-line)
|
|
|
735 (or (vrml-in-comment)
|
|
|
736 (progn
|
|
|
737 ;; Not in a comment, so we have to insert one. Create an
|
|
|
738 ;; empty comment (since there isn't one on this line).
|
|
|
739 (skip-chars-backward " \t")
|
|
|
740 (let ((eolpoint (point)))
|
|
|
741 (beginning-of-line)
|
|
|
742 (if (/= (point) eolpoint)
|
|
|
743 (progn
|
|
|
744 (goto-char eolpoint)
|
|
|
745 (insert
|
|
|
746 "# ")
|
|
|
747 (backward-char))))))
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|
|
748 ;; Point is just after the "#" starting a comment. Move it as
|
|
|
749 ;; appropriate.
|
|
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750 (let* ((indent (funcall comment-indent-function))
|
|
|
751 (begpos (progn
|
|
|
752 (backward-char)
|
|
|
753 (point))))
|
|
|
754 (if (/= begpos indent)
|
|
|
755 (progn
|
|
|
756 (skip-chars-backward " \t" (save-excursion
|
|
|
757 (beginning-of-line)
|
|
|
758 (point)))
|
|
|
759 (delete-region (point) begpos)
|
|
|
760 (indent-to indent)))
|
|
|
761 (looking-at comment-start-skip) ; Always true.
|
|
|
762 (goto-char (match-end 0))
|
|
|
763 ;; I don't like the effect of the next two.
|
|
|
764 ;;(skip-chars-backward " \t" (match-beginning 0))
|
|
|
765 ;;(skip-chars-backward "^ \t" (match-beginning 0))
|
|
|
766 ))
|
|
|
767
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|
768 ;;; vrml-mode.el ends here
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