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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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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: Not in FSF.
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26
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27 ;;; Commentary:
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28
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29 ;; Mostly bastardized from tcl.el.
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30
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31 ;; HOW TO INSTALL:
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32 ;; Put the following forms in your .emacs to enable autoloading of VRML
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33 ;; mode, and auto-recognition of ".wrl" files.
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34 ;;
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35 ;; (autoload 'vrml-mode "vrml" "VRML mode." t)
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36 ;; (setq auto-mode-alist (append '(("\\.wrl\\'" . vrml-mode))
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37 ;; auto-mode-alist))
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38 ;;
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39
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40 ;;; Code:
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41
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42 ;;
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43 ;; User variables.
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44 ;;
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45
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46 (defvar vrml-indent-level 3
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47 "*Indentation of VRML statements with respect to containing block.")
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48
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49 (defvar vrml-auto-newline nil
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50 "*Non-nil means automatically newline before and after braces
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51 inserted in VRML code.")
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52
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53 (defvar vrml-tab-always-indent t
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54 "*Control effect of TAB key.
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55 If t (the default), always indent current line.
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56 If nil and point is not in the indentation area at the beginning of
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57 the line, a TAB is inserted.
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58 Other values cause the first possible action from the following list
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59 to take place:
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60
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61 1. Move from beginning of line to correct indentation.
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62 2. Delete an empty comment.
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63 3. Move forward to start of comment, indenting if necessary.
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64 4. Move forward to end of line, indenting if necessary.
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65 5. Create an empty comment.
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66 6. Move backward to start of comment, indenting if necessary.")
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67
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68 (defvar vrml-use-hairy-comment-detector t
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69 "*If not `nil', the the more complicated, but slower, comment
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70 detecting function is used.")
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71
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72 (defvar vrml-mode-abbrev-table nil
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73 "Abbrev table used while in VRML mode.")
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74 (define-abbrev-table 'vrml-mode-abbrev-table ())
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75
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76 (defvar vrml-mode-map ()
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77 "Keymap used in VRML mode.")
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78 (if (null vrml-mode-map)
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79 (progn
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80 (setq vrml-mode-map (make-sparse-keymap))
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81 (set-keymap-name vrml-mode-map 'vrml-mode-map)
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82 (define-key vrml-mode-map "{" 'vrml-electric-brace)
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83 (define-key vrml-mode-map "}" 'vrml-electric-brace)
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84 (define-key vrml-mode-map "\e\C-q" 'indent-vrml-exp)
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85 (define-key vrml-mode-map "\177" 'backward-delete-char-untabify)
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86 (define-key vrml-mode-map "\t" 'vrml-indent-command)
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87 (define-key vrml-mode-map "\M-;" 'vrml-indent-for-comment)
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88 ))
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89
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90 (defvar vrml-mode-syntax-table nil
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91 "Syntax table in use in vrml-mode buffers.")
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92
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93 (if vrml-mode-syntax-table
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94 ()
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95 (setq vrml-mode-syntax-table (make-syntax-table))
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96 (modify-syntax-entry ?\n ">" vrml-mode-syntax-table)
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97 (modify-syntax-entry ?\f ">" vrml-mode-syntax-table)
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98 (modify-syntax-entry ?\# "<" 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
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117 (defvar vrml-mode-hook nil
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118 "Hook run on entry to VRML mode.")
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119
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120 (defvar vrml-keyword-list
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121 '(
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122 ; shape nodes:
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123 "AsciiText" "Cone" "Cube" "Cylinder" "IndexedFaceSet" "IndexedLineSet"
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124 "PointSet" "Sphere"
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125 ; geometry and material nodes:
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126 "Coordinate3" "FontStyle" "Info" "LOD" "Material" "MaterialBinding"
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127 "Normal" "NormalBinding" "Texture2" "Texture2Transform"
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128 "TextureCoordinate2" "ShapeHints"
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129 ; transformation nodes:
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130 "MatrixTransform" "Rotation" "Scale" "Transform" "Translation"
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131 ;camera nodes:
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132 "OrthographicCamera" "PerspectiveCamera"
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133 ;lighting nodes:
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134 "DirectionalLight" "PointLight" "SpotLight"
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135 ;group nodes:
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136 "Group" "Separator" "Switch" "TransformSeparator" "WWWAnchor"
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137 ;other:
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138 "WWWInline"
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139 ;new VRML 2.0 nodes (#### not yet classified)
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140 "Anchor" "Appearance" "AudioClip" "Background" "Billboard" "Box"
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141 "Collision" "Color" "ColorInterpolator" "Coordinate"
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142 "CoordinateInterpolator" "CylinderSensor" "DiskSensor" "ElevationGrid"
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143 "Extrusion" "Fog" "FontStyle" "ImageTexture" "Inline" "MovieTexture"
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144 "NavigationInfo" "NormalInterpolator" "OrientationInterpolator"
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145 "PixelTexture" "PlaneSensor" "PositionInterpolator" "ProximitySensor"
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146 "ScalarInterpolator" "Script" "Shape" "Sound" "SphereSensor" "Text"
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147 "TextureTransform" "TextureCoordinate" "TimeSensor" "TouchSensor"
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148 "Viewpoint" "VisibilitySensor" "WorldInfo"
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149 ;VRML 2.0 node fields
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150 "eventIn" "eventOut" "field" "exposedField"
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151 ;misc. VRML 2.0 keywords (DEF, PROTO, EXTERNPROTO handled below)
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152 "USE" "ROUTE" "TO" "IS" "TRUE" "FALSE" "NULL"
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153 ))
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154
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155 (defconst vrml-font-lock-keywords
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156 (list
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157 ;; Names of functions (and other "defining things").
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158 (list "\\(DEF\\|PROTO\\|EXTERNPROTO\\)[ \t\n]+\\([^ \t\n]+\\)"
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159 2 'font-lock-function-name-face)
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160
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161 ;; Keywords. Only recognized if surrounded by whitespace.
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162 ;; FIXME consider using "not word or symbol", not
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163 ;; "whitespace".
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164 (cons (concat "\\(\\s-\\|^\\)\\("
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165 ;; FIXME Use regexp-quote?
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166 (mapconcat 'identity vrml-keyword-list "\\|")
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167 "\\)\\(\\s-\\|$\\)")
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168 2)
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169 )
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170 "Keywords to highlight for VRML. See variable `font-lock-keywords'.")
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171
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172 ;;;###autoload
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173 (defun vrml-mode ()
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174 "Major mode for editing VRML code.
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175 Expression and list commands understand all VRML brackets.
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176 Tab indents for VRML code.
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177 Paragraphs are separated by blank lines only.
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178 Delete converts tabs to spaces as it moves back.
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179
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180 Variables controlling indentation style:
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181 vrml-indent-level
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182 Indentation of VRML statements within surrounding block.
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183
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184 Variables controlling user interaction with mode (see variable
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185 documentation for details):
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186 vrml-tab-always-indent
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187 Controls action of TAB key.
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188 vrml-auto-newline
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189 Non-nil means automatically newline before and after braces
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190 inserted in VRML code.
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191
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192 Turning on VRML mode calls the value of the variable `vrml-mode-hook'
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193 with no args, if that value is non-nil. Read the documentation for
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194 `vrml-mode-hook' to see what kinds of interesting hook functions
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195 already exist.
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196
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197 Commands:
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198 \\{vrml-mode-map}"
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199 (interactive)
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200 (kill-all-local-variables)
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201 (use-local-map vrml-mode-map)
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202 (setq major-mode 'vrml-mode)
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203 (setq mode-name "VRML")
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204 (setq local-abbrev-table vrml-mode-abbrev-table)
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205 (set-syntax-table vrml-mode-syntax-table)
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206
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207 (make-local-variable 'paragraph-start)
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208 (make-local-variable 'paragraph-separate)
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209 (if (fboundp 'move-to-left-margin)
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210 (progn
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211 ;; In FSF Emacs 19.29 / XEmacs 19.14, you aren't supposed to
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212 ;; start these with a ^.
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213 (setq paragraph-start "$\\| ")
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214 (setq paragraph-separate paragraph-start))
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215 (setq paragraph-start (concat "^$\\|" page-delimiter))
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216 (setq paragraph-separate paragraph-start))
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217 (make-local-variable 'paragraph-ignore-fill-prefix)
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218 (setq paragraph-ignore-fill-prefix t)
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219 (make-local-variable 'fill-paragraph-function)
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220 (setq fill-paragraph-function 'vrml-do-fill-paragraph)
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221
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222 (make-local-variable 'indent-line-function)
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223 (setq indent-line-function 'vrml-indent-line)
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224 (make-local-variable 'require-final-newline)
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225 (setq require-final-newline t)
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226
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227 (make-local-variable 'comment-start)
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228 (setq comment-start "# ")
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229 (make-local-variable 'comment-start-skip)
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230 (setq comment-start-skip "#+ *")
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231 (make-local-variable 'comment-column)
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232 (setq comment-column 40)
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233 (make-local-variable 'comment-end)
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234 (setq comment-end "")
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235
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236 (make-local-variable 'outline-regexp)
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237 (setq outline-regexp "[^\n\^M]")
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238 (make-local-variable 'outline-level)
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239 (setq outline-level 'vrml-outline-level)
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240
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241 (make-local-variable 'font-lock-keywords)
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242 (setq font-lock-keywords vrml-font-lock-keywords)
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243
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244 (make-local-variable 'parse-sexp-ignore-comments)
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245 (setq parse-sexp-ignore-comments t)
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246
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247 (make-local-variable 'defun-prompt-regexp)
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248 (setq defun-prompt-regexp "^[^ \t\n#}][^\n}]+}*[ \t]+")
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249
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250 ;; Settings for new dabbrev code.
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251 (make-local-variable 'dabbrev-case-fold-search)
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252 (setq dabbrev-case-fold-search nil)
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253 (make-local-variable 'dabbrev-case-replace)
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254 (setq dabbrev-case-replace nil)
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255 (make-local-variable 'dabbrev-abbrev-skip-leading-regexp)
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256 (setq dabbrev-abbrev-skip-leading-regexp "[$!]")
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257 (make-local-variable 'dabbrev-abbrev-char-regexp)
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258 (setq dabbrev-abbrev-char-regexp "\\sw\\|\\s_")
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259
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260 (run-hooks 'vrml-mode-hook))
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261
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262 ;; This is used for closing braces. If vrml-auto-newline is set, can
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263 ;; insert a newline both before and after the brace, depending on
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264 ;; context. FIXME should this be configurable? Does anyone use this?
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265 (defun vrml-electric-brace (arg)
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266 "Insert character and correct line's indentation."
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267 (interactive "p")
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268 ;; If auto-newlining and there is stuff on the same line, insert a
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269 ;; newline first.
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270 (if vrml-auto-newline
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271 (progn
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272 (if (save-excursion
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273 (skip-chars-backward " \t")
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274 (bolp))
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275 ()
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276 (vrml-indent-line)
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277 (newline))
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278 ;; In auto-newline case, must insert a newline after each
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279 ;; brace. So an explicit loop is needed.
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280 (while (> arg 0)
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281 (insert last-command-char)
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282 (vrml-indent-line)
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283 (newline)
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284 (setq arg (1- arg))))
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285 (self-insert-command arg))
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286 (vrml-indent-line))
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287
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288
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289
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290 (defun vrml-indent-command (&optional arg)
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291 "Indent current line as VRML code, or in some cases insert a tab character.
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292 If vrml-tab-always-indent is t (the default), always indent current line.
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293 If vrml-tab-always-indent is nil and point is not in the indentation
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294 area at the beginning of the line, a TAB is inserted.
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295 Other values of vrml-tab-always-indent cause the first possible action
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296 from the following list to take place:
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297
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298 1. Move from beginning of line to correct indentation.
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299 2. Delete an empty comment.
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300 3. Move forward to start of comment, indenting if necessary.
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301 4. Move forward to end of line, indenting if necessary.
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302 5. Create an empty comment.
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303 6. Move backward to start of comment, indenting if necessary."
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304 (interactive "p")
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305 (cond
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306 ((not vrml-tab-always-indent)
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307 ;; Indent if in indentation area, otherwise insert TAB.
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308 (if (<= (current-column) (current-indentation))
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309 (vrml-indent-line)
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310 (self-insert-command arg)))
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311 ((eq vrml-tab-always-indent t)
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312 ;; Always indent.
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313 (vrml-indent-line))
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314 (t
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315 ;; "Perl-mode" style TAB command.
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316 (let* ((ipoint (point))
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317 (eolpoint (progn
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318 (end-of-line)
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319 (point)))
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320 (comment-p (vrml-in-comment)))
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321 (cond
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322 ((= ipoint (save-excursion
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323 (beginning-of-line)
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324 (point)))
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325 (beginning-of-line)
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326 (vrml-indent-line)
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327 ;; If indenting didn't leave us in column 0, go to the
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328 ;; indentation. Otherwise leave point at end of line. This
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329 ;; is a hack.
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330 (if (= (point) (save-excursion
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331 (beginning-of-line)
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332 (point)))
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333 (end-of-line)
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334 (back-to-indentation)))
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335 ((and comment-p (looking-at "[ \t]*$"))
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336 ;; Empty comment, so delete it. We also delete any ";"
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337 ;; characters at the end of the line. I think this is
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338 ;; friendlier, but I don't know how other people will feel.
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339 (backward-char)
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340 (skip-chars-backward " \t;")
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341 (delete-region (point) eolpoint))
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342 ((and comment-p (< ipoint (point)))
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343 ;; Before comment, so skip to it.
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344 (vrml-indent-line)
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345 (indent-for-comment))
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346 ((/= ipoint eolpoint)
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347 ;; Go to end of line (since we're not there yet).
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348 (goto-char eolpoint)
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349 (vrml-indent-line))
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350 ((not comment-p)
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351 (vrml-indent-line)
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352 (vrml-indent-for-comment))
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353 (t
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354 ;; Go to start of comment. We don't leave point where it is
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355 ;; because we want to skip comment-start-skip.
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356 (vrml-indent-line)
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357 (indent-for-comment)))))))
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358
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359 (defun vrml-indent-line ()
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360 "Indent current line as VRML code.
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361 Return the amount the indentation changed by."
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362 (let ((indent (calculate-vrml-indent nil))
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363 beg shift-amt
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|
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364 (case-fold-search nil)
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|
|
365 (pos (- (point-max) (point))))
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|
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366 (beginning-of-line)
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|
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367 (setq beg (point))
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|
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368 (cond ((eq indent nil)
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|
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369 (setq indent (current-indentation)))
|
|
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370 (t
|
|
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371 (skip-chars-forward " \t")
|
|
|
372 (if (listp indent) (setq indent (car indent)))
|
|
|
373 (cond ((= (following-char) ?})
|
|
|
374 (setq indent (- indent vrml-indent-level)))
|
|
|
375 ((= (following-char) ?\])
|
|
|
376 (setq indent (- indent 1))))))
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|
|
377 (skip-chars-forward " \t")
|
|
|
378 (setq shift-amt (- indent (current-column)))
|
|
|
379 (if (zerop shift-amt)
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|
|
380 (if (> (- (point-max) pos) (point))
|
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|
381 (goto-char (- (point-max) pos)))
|
|
|
382 (delete-region beg (point))
|
|
|
383 (indent-to indent)
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|
|
384 ;; If initial point was within line's indentation,
|
|
|
385 ;; position after the indentation. Else stay at same point in text.
|
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386 (if (> (- (point-max) pos) (point))
|
|
|
387 (goto-char (- (point-max) pos))))
|
|
|
388 shift-amt))
|
|
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389
|
|
|
390 (defun calculate-vrml-indent (&optional parse-start)
|
|
|
391 "Return appropriate indentation for current line as VRML code.
|
|
|
392 In usual case returns an integer: the column to indent to.
|
|
|
393 Returns nil if line starts inside a string, t if in a comment."
|
|
|
394 (save-excursion
|
|
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395 (beginning-of-line)
|
|
|
396 (let* ((indent-point (point))
|
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|
397 (case-fold-search nil)
|
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398 state
|
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399 containing-sexp
|
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400 found-next-line)
|
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|
401 (if parse-start
|
|
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402 (goto-char parse-start)
|
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403 (beginning-of-defun))
|
|
|
404 (while (< (point) indent-point)
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|
405 (setq parse-start (point))
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|
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406 (setq state (parse-partial-sexp (point) indent-point 0))
|
|
|
407 (setq containing-sexp (car (cdr state))))
|
|
|
408 (cond ((or (nth 3 state) (nth 4 state))
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|
|
409 ;; Inside comment or string. Return nil or t if should
|
|
|
410 ;; not change this line
|
|
|
411 (nth 4 state))
|
|
|
412 ((null containing-sexp)
|
|
|
413 ;; Line is at top level.
|
|
|
414 0)
|
|
|
415 (t
|
|
|
416 (goto-char containing-sexp)
|
|
|
417 (let* ((expr-start (point)))
|
|
|
418 ;; Find the first statement in the block and indent
|
|
|
419 ;; like it. The first statement in the block might be
|
|
|
420 ;; on the same line, so what we do is skip all
|
|
|
421 ;; "virtually blank" lines, looking for a non-blank
|
|
|
422 ;; one. A line is virtually blank if it only contains
|
|
|
423 ;; a comment and whitespace. We do it this funky way
|
|
|
424 ;; because we want to know if we've found a statement
|
|
|
425 ;; on some line _after_ the line holding the sexp
|
|
|
426 ;; opener.
|
|
|
427 (goto-char containing-sexp)
|
|
|
428 (forward-char)
|
|
|
429 (if (and (< (point) indent-point)
|
|
|
430 (looking-at "[ \t]*\\(#.*\\)?$"))
|
|
|
431 (progn
|
|
|
432 (forward-line)
|
|
|
433 (while (and (< (point) indent-point)
|
|
|
434 (looking-at "[ \t]*\\(#.*\\)?$"))
|
|
|
435 (setq found-next-line t)
|
|
|
436 (forward-line))))
|
|
|
437 (if (not (or (= (char-after containing-sexp) ?{)
|
|
|
438 (and (= (char-after containing-sexp) ?\[)
|
|
|
439 (save-excursion
|
|
|
440 (goto-char containing-sexp)
|
|
|
441 (skip-chars-backward " \t\n")
|
|
|
442 (forward-char -8)
|
|
|
443 (looking-at "children")))))
|
|
|
444 (progn
|
|
|
445 ;; Line is continuation line, or the sexp opener
|
|
|
446 ;; is not a curly brace, or we are are looking at
|
|
|
447 ;; an `expr' expression (which must be split
|
|
|
448 ;; specially). So indentation is column of first
|
|
|
449 ;; good spot after sexp opener. If there is no
|
|
|
450 ;; nonempty line before the indentation point, we
|
|
|
451 ;; use the column of the character after the sexp
|
|
|
452 ;; opener.
|
|
|
453 (if (>= (point) indent-point)
|
|
|
454 (progn
|
|
|
455 (goto-char containing-sexp)
|
|
|
456 (forward-char))
|
|
|
457 (skip-chars-forward " \t"))
|
|
|
458 (current-column))
|
|
|
459 ;; After a curly brace, and not a continuation line.
|
|
|
460 ;; So take indentation from first good line after
|
|
|
461 ;; start of block, unless that line is on the same
|
|
|
462 ;; line as the opening brace. In this case use the
|
|
|
463 ;; indentation of the opening brace's line, plus
|
|
|
464 ;; another indent step. If we are in the body part
|
|
|
465 ;; of an "if" or "while" then the indentation is
|
|
|
466 ;; taken from the line holding the start of the
|
|
|
467 ;; statement.
|
|
|
468 (if (and (< (point) indent-point)
|
|
|
469 found-next-line)
|
|
|
470 (current-indentation)
|
|
|
471 (if t ; commands-p
|
|
|
472 (goto-char expr-start)
|
|
|
473 (goto-char containing-sexp))
|
|
|
474 (+ (current-indentation) vrml-indent-level)))))))))
|
|
|
475
|
|
|
476
|
|
|
477
|
|
|
478 (defun indent-vrml-exp ()
|
|
|
479 "Indent each line of the VRML grouping following point."
|
|
|
480 (interactive)
|
|
|
481 (let ((indent-stack (list nil))
|
|
|
482 (contain-stack (list (point)))
|
|
|
483 (case-fold-search nil)
|
|
|
484 outer-loop-done inner-loop-done state ostate
|
|
|
485 this-indent last-sexp
|
|
|
486 (next-depth 0)
|
|
|
487 last-depth)
|
|
|
488 (save-excursion
|
|
|
489 (forward-sexp 1))
|
|
|
490 (save-excursion
|
|
|
491 (setq outer-loop-done nil)
|
|
|
492 (while (and (not (eobp)) (not outer-loop-done))
|
|
|
493 (setq last-depth next-depth)
|
|
|
494 ;; Compute how depth changes over this line
|
|
|
495 ;; plus enough other lines to get to one that
|
|
|
496 ;; does not end inside a comment or string.
|
|
|
497 ;; Meanwhile, do appropriate indentation on comment lines.
|
|
|
498 (setq inner-loop-done nil)
|
|
|
499 (while (and (not inner-loop-done)
|
|
|
500 (not (and (eobp) (setq outer-loop-done t))))
|
|
|
501 (setq ostate state)
|
|
|
502 (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
|
|
|
503 nil nil state))
|
|
|
504 (setq next-depth (car state))
|
|
|
505 (if (and (car (cdr (cdr state)))
|
|
|
506 (>= (car (cdr (cdr state))) 0))
|
|
|
507 (setq last-sexp (car (cdr (cdr state)))))
|
|
|
508 (if (or (nth 4 ostate))
|
|
|
509 (vrml-indent-line))
|
|
|
510 (if (or (nth 3 state))
|
|
|
511 (forward-line 1)
|
|
|
512 (setq inner-loop-done t)))
|
|
|
513 (if (<= next-depth 0)
|
|
|
514 (setq outer-loop-done t))
|
|
|
515 (if outer-loop-done
|
|
|
516 nil
|
|
|
517 ;; If this line had ..))) (((.. in it, pop out of the levels
|
|
|
518 ;; that ended anywhere in this line, even if the final depth
|
|
|
519 ;; doesn't indicate that they ended.
|
|
|
520 (while (> last-depth (nth 6 state))
|
|
|
521 (setq indent-stack (cdr indent-stack)
|
|
|
522 contain-stack (cdr contain-stack)
|
|
|
523 last-depth (1- last-depth)))
|
|
|
524 (if (/= last-depth next-depth)
|
|
|
525 (setq last-sexp nil))
|
|
|
526 ;; Add levels for any parens that were started in this line.
|
|
|
527 (while (< last-depth next-depth)
|
|
|
528 (setq indent-stack (cons nil indent-stack)
|
|
|
529 contain-stack (cons nil contain-stack)
|
|
|
530 last-depth (1+ last-depth)))
|
|
|
531 (if (null (car contain-stack))
|
|
|
532 (setcar contain-stack
|
|
|
533 (or (car (cdr state))
|
|
|
534 (save-excursion
|
|
|
535 (forward-sexp -1)
|
|
|
536 (point)))))
|
|
|
537 (forward-line 1)
|
|
|
538 (skip-chars-forward " \t")
|
|
|
539 (if (eolp)
|
|
|
540 nil
|
|
|
541 (if (and (car indent-stack)
|
|
|
542 (>= (car indent-stack) 0))
|
|
|
543 ;; Line is on an existing nesting level.
|
|
|
544 (setq this-indent (car indent-stack))
|
|
|
545 ;; Just started a new nesting level.
|
|
|
546 ;; Compute the standard indent for this level.
|
|
|
547 (let ((val (calculate-vrml-indent
|
|
|
548 (if (car indent-stack)
|
|
|
549 (- (car indent-stack))))))
|
|
|
550 (setcar indent-stack
|
|
|
551 (setq this-indent val))
|
|
|
552 ))
|
|
|
553 (cond ((not (numberp this-indent)))
|
|
|
554 ((= (following-char) ?})
|
|
|
555 (setq this-indent (- this-indent vrml-indent-level)))
|
|
|
556 ((= (following-char) ?\])
|
|
|
557 (setq this-indent (- this-indent 1))))
|
|
|
558 ;; Put chosen indentation into effect.
|
|
|
559 (or (null this-indent)
|
|
|
560 (= (current-column)
|
|
|
561 this-indent)
|
|
|
562 (progn
|
|
|
563 (delete-region (point) (progn (beginning-of-line) (point)))
|
|
|
564 (indent-to
|
|
|
565 this-indent))))))))
|
|
|
566 )
|
|
|
567
|
|
|
568 ;;
|
|
|
569 ;; Auto-fill support.
|
|
|
570 ;;
|
|
|
571
|
|
|
572 (defun vrml-real-command-p ()
|
|
|
573 "Return nil if point is not at the beginning of a command.
|
|
|
574 A command is the first word on an otherwise empty line, or the
|
|
|
575 first word following an opening brace."
|
|
|
576 (save-excursion
|
|
|
577 (skip-chars-backward " \t")
|
|
|
578 (cond
|
|
|
579 ((bobp) t)
|
|
|
580 ((bolp)
|
|
|
581 (backward-char)
|
|
|
582 ;; Note -- continued comments are not supported here. I
|
|
|
583 ;; consider those to be a wart on the language.
|
|
|
584 (not (eq ?\\ (preceding-char))))
|
|
|
585 (t
|
|
|
586 (memq (preceding-char) '(?{))))))
|
|
|
587
|
|
|
588 ;; FIXME doesn't actually return t. See last case.
|
|
|
589 (defun vrml-real-comment-p ()
|
|
|
590 "Return t if point is just after the `#' beginning a real comment.
|
|
|
591 Does not check to see if previous char is actually `#'.
|
|
|
592 A real comment is either at the beginning of the buffer,
|
|
|
593 preceeded only by whitespace on the line, or has a preceeding
|
|
|
594 semicolon, opening brace, or opening bracket on the same line."
|
|
|
595 (save-excursion
|
|
|
596 (backward-char)
|
|
|
597 (vrml-real-command-p)))
|
|
|
598
|
|
|
599 (defun vrml-hairy-scan-for-comment (state end always-stop)
|
|
|
600 "Determine if point is in a comment.
|
|
|
601 Returns a list of the form `(FLAG . STATE)'. STATE can be used
|
|
|
602 as input to future invocations. FLAG is nil if not in comment,
|
|
|
603 t otherwise. If in comment, leaves point at beginning of comment.
|
|
|
604 See also `vrml-simple-scan-for-comment', a simpler version that is
|
|
|
605 often right."
|
|
|
606 (let ((bol (save-excursion
|
|
|
607 (goto-char end)
|
|
|
608 (beginning-of-line)
|
|
|
609 (point)))
|
|
|
610 real-comment
|
|
|
611 last-cstart)
|
|
|
612 (while (and (not last-cstart) (< (point) end))
|
|
|
613 (setq real-comment nil) ;In case we've looped around and it is
|
|
|
614 ;set.
|
|
|
615 (setq state (parse-partial-sexp (point) end nil nil state t))
|
|
|
616 (if (nth 4 state)
|
|
|
617 (progn
|
|
|
618 ;; If ALWAYS-STOP is set, stop even if we don't have a
|
|
|
619 ;; real comment, or if the comment isn't on the same line
|
|
|
620 ;; as the end.
|
|
|
621 (if always-stop (setq last-cstart (point)))
|
|
|
622 ;; If we have a real comment, then set the comment
|
|
|
623 ;; starting point if we are on the same line as the ending
|
|
|
624 ;; location.
|
|
|
625 (setq real-comment (vrml-real-comment-p))
|
|
|
626 (if real-comment
|
|
|
627 (progn
|
|
|
628 (and (> (point) bol) (setq last-cstart (point)))
|
|
|
629 ;; NOTE Emacs 19 has a misfeature whereby calling
|
|
|
630 ;; parse-partial-sexp with COMMENTSTOP set and with
|
|
|
631 ;; an initial list that says point is in a comment
|
|
|
632 ;; will cause an immediate return. So we must skip
|
|
|
633 ;; over the comment ourselves.
|
|
|
634 (beginning-of-line 2)))
|
|
|
635 ;; Frob the state to make it look like we aren't in a
|
|
|
636 ;; comment.
|
|
|
637 (setcar (nthcdr 4 state) nil))))
|
|
|
638 (and last-cstart
|
|
|
639 (goto-char last-cstart))
|
|
|
640 (cons real-comment state)))
|
|
|
641
|
|
|
642 (defun vrml-hairy-in-comment ()
|
|
|
643 "Return t if point is in a comment, and leave point at beginning
|
|
|
644 of comment."
|
|
|
645 (let ((save (point)))
|
|
|
646 (beginning-of-defun)
|
|
|
647 (car (vrml-hairy-scan-for-comment nil save nil))))
|
|
|
648
|
|
|
649 (defun vrml-simple-in-comment ()
|
|
|
650 "Return t if point is in comment, and leave point at beginning
|
|
|
651 of comment. This is faster than `vrml-hairy-in-comment', but is
|
|
|
652 correct less often."
|
|
|
653 (let ((save (point))
|
|
|
654 comment)
|
|
|
655 (beginning-of-line)
|
|
|
656 (while (and (< (point) save) (not comment))
|
|
|
657 (search-forward "#" save 'move)
|
|
|
658 (setq comment (vrml-real-comment-p)))
|
|
|
659 comment))
|
|
|
660
|
|
|
661 (defun vrml-in-comment ()
|
|
|
662 "Return t if point is in comment, and leave point at beginning
|
|
|
663 of comment."
|
|
|
664 (if vrml-use-hairy-comment-detector
|
|
|
665 (vrml-hairy-in-comment)
|
|
|
666 (vrml-simple-in-comment)))
|
|
|
667
|
|
|
668 (defun vrml-do-fill-paragraph (ignore)
|
|
|
669 "fill-paragraph function for VRML mode. Only fills in a comment."
|
|
|
670 (let (in-comment col where)
|
|
|
671 (save-excursion
|
|
|
672 (end-of-line)
|
|
|
673 (setq in-comment (vrml-in-comment))
|
|
|
674 (if in-comment
|
|
|
675 (progn
|
|
|
676 (setq where (1+ (point)))
|
|
|
677 (setq col (1- (current-column))))))
|
|
|
678 (and in-comment
|
|
|
679 (save-excursion
|
|
|
680 (back-to-indentation)
|
|
|
681 (= col (current-column)))
|
|
|
682 ;; In a comment. Set the fill prefix, and find the paragraph
|
|
|
683 ;; boundaries by searching for lines that look like
|
|
|
684 ;; comment-only lines.
|
|
|
685 (let ((fill-prefix (buffer-substring (progn
|
|
|
686 (beginning-of-line)
|
|
|
687 (point))
|
|
|
688 where))
|
|
|
689 p-start p-end)
|
|
|
690 ;; Search backwards.
|
|
|
691 (save-excursion
|
|
|
692 (while (looking-at "^[ \t]*#")
|
|
|
693 (forward-line -1))
|
|
|
694 (forward-line)
|
|
|
695 (setq p-start (point)))
|
|
|
696
|
|
|
697 ;; Search forwards.
|
|
|
698 (save-excursion
|
|
|
699 (while (looking-at "^[ \t]*#")
|
|
|
700 (forward-line))
|
|
|
701 (setq p-end (point)))
|
|
|
702
|
|
|
703 ;; Narrow and do the fill.
|
|
|
704 (save-restriction
|
|
|
705 (narrow-to-region p-start p-end)
|
|
|
706 (fill-paragraph ignore)))))
|
|
|
707 t)
|
|
|
708
|
|
|
709 (defun vrml-do-auto-fill ()
|
|
|
710 "Auto-fill function for VRML mode. Only auto-fills in a comment."
|
|
|
711 (if (> (current-column) fill-column)
|
|
|
712 (let ((fill-prefix "# ")
|
|
|
713 in-comment col)
|
|
|
714 (save-excursion
|
|
|
715 (setq in-comment (vrml-in-comment))
|
|
|
716 (if in-comment
|
|
|
717 (setq col (1- (current-column)))))
|
|
|
718 (if in-comment
|
|
|
719 (progn
|
|
|
720 (do-auto-fill)
|
|
|
721 (save-excursion
|
|
|
722 (back-to-indentation)
|
|
|
723 (delete-region (point) (save-excursion
|
|
|
724 (beginning-of-line)
|
|
|
725 (point)))
|
|
|
726 (indent-to-column col)))))))
|
|
|
727
|
|
|
728 (defun vrml-indent-for-comment ()
|
|
|
729 "Indent this line's comment to comment column, or insert an empty comment.
|
|
|
730 Is smart about syntax of VRML comments.
|
|
|
731 Parts of this were taken from indent-for-comment (simple.el)."
|
|
|
732 (interactive "*")
|
|
|
733 (end-of-line)
|
|
|
734 (or (vrml-in-comment)
|
|
|
735 (progn
|
|
|
736 ;; Not in a comment, so we have to insert one. Create an
|
|
|
737 ;; empty comment (since there isn't one on this line).
|
|
|
738 (skip-chars-backward " \t")
|
|
|
739 (let ((eolpoint (point)))
|
|
|
740 (beginning-of-line)
|
|
|
741 (if (/= (point) eolpoint)
|
|
|
742 (progn
|
|
|
743 (goto-char eolpoint)
|
|
|
744 (insert
|
|
|
745 "# ")
|
|
|
746 (backward-char))))))
|
|
|
747 ;; Point is just after the "#" starting a comment. Move it as
|
|
|
748 ;; appropriate.
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749 (let* ((indent (funcall comment-indent-function))
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750 (begpos (progn
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751 (backward-char)
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752 (point))))
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|
|
753 (if (/= begpos indent)
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|
754 (progn
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|
755 (skip-chars-backward " \t" (save-excursion
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756 (beginning-of-line)
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|
|
757 (point)))
|
|
|
758 (delete-region (point) begpos)
|
|
|
759 (indent-to indent)))
|
|
|
760 (looking-at comment-start-skip) ; Always true.
|
|
|
761 (goto-char (match-end 0))
|
|
|
762 ;; I don't like the effect of the next two.
|
|
|
763 ;;(skip-chars-backward " \t" (match-beginning 0))
|
|
|
764 ;;(skip-chars-backward "^ \t" (match-beginning 0))
|
|
|
765 ))
|
|
|
766
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767 ;;; vrml-mode.el ends here
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