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1 ;;; prolog.el --- major mode for editing and running Prolog under Emacs
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2
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3 ;; Copyright (C) 1986, 1987, 1993 Free Software Foundation, Inc.
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4
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5 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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6 ;; Keywords: languages
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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16
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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2
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25 ;;; Synched up with: Not synched with FSF, we appear to have a newer version
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26
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27 ;;; Commentary:
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28
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29 ;; This package provides a major mode for editing Prolog. It knows
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30 ;; about Prolog syntax and comments, and can send regions to an inferior
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31 ;; Prolog interpreter process.
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32
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33 ;;; Code:
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34
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35 (defvar prolog-mode-syntax-table nil)
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36 (defvar prolog-mode-abbrev-table nil)
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37 (defvar prolog-mode-map nil)
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134
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38
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39 (defgroup prolog nil
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40 "Major mode for editing and running Prolog under Emacs"
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41 :group 'languages)
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42
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43
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134
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44 (defcustom prolog-program-name "prolog"
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45 "*Program name for invoking an inferior Prolog with `run-prolog'."
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46 :type 'string
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47 :group 'prolog)
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48
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134
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49 (defcustom prolog-consult-string "reconsult(user).\n"
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50 "*(Re)Consult mode (for C-Prolog and Quintus Prolog). "
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51 :type 'string
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52 :group 'prolog)
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53
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134
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54 (defcustom prolog-compile-string "compile(user).\n"
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55 "*Compile mode (for Quintus Prolog)."
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56 :type 'string
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57 :group 'prolog)
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58
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134
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59 (defcustom prolog-eof-string "end_of_file.\n"
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60 "*String that represents end of file for prolog.
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61 nil means send actual operating system end of file."
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62 :type 'string
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63 :group 'prolog)
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64
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134
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65 (defcustom prolog-indent-width 4
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66 "Level of indentation in Prolog buffers."
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67 :type 'integer
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68 :group 'prolog)
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69
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70 (defconst prolog-font-lock-keywords (purecopy
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71 (list
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72 (cons (concat
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73 "[( \t]\\("
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74 (mapconcat 'identity
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75 '("write" "writeq" "nl" "is" "call" "read" "get" "get0"
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76 "tell" "told" "open" "close" "format" "put"
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77 "assert" "asserta" "assertz"
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78 "retract" "retractall" "clause"
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79 "record" "recorda" "abolish"
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80 "setof" "bagof" "findall" "sort" "compare"
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81 "var" "nonvar" "integer" "float" "number" "ground"
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82 "atom" "atomic" "simple" "callable" "compound"
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83 "functor" "arg" "copy_term" "numbervars"
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84 "atom_chars" "number_chars" "atom_to_chars"
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85 "length" "unix" "halt"
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86 "op" "dynamic" "meta_predicate" "raise_exception"
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87 "module" "ensure_loaded" "use_module"
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88 "fail" "true"
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89 "module_interface" "begin_module" "define_struct"
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90 "import" "export" "global" "tool" "external"
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91 "define_macro" "local" "library" "from"
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92 )
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93 "\\|")
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94 "\\)[ .,\t\n()]")
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95 1)
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96 '("^[a-z][a-zA-Z0-9_]+" 0 font-lock-function-name-face)
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97 ; '("[@!$#]" 0 font-lock-function-name-face)
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98 '("!" 0 font-lock-function-name-face)
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99 '("@" 0 font-lock-function-name-face)
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100 '("<=>" 0 font-lock-function-name-face)
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101 '("==>" 0 font-lock-function-name-face)
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102 '(";" 0 font-lock-function-name-face)
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103 '(":-" 0 font-lock-function-name-face)
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104 '("\\[" 0 font-lock-keyword-face)
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105 '("\\]" 0 font-lock-keyword-face)
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106 '("|" 0 font-lock-keyword-face)
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107 ))
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108 "Additional expressions to highlight in Prolog mode.")
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109
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110 (if prolog-mode-syntax-table
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111 ()
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112 (let ((table (make-syntax-table)))
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113 (modify-syntax-entry ?/ ". 14" table)
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114 (modify-syntax-entry ?* ". 23" table)
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115 (modify-syntax-entry ?% "< b" table)
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116 (modify-syntax-entry ?\n "> b" table)
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117 (modify-syntax-entry ?_ "w" table)
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118 (modify-syntax-entry ?\\ "\\" table)
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119 (modify-syntax-entry ?\' "\"" table)
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120 (modify-syntax-entry ?+ "." table)
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121 (modify-syntax-entry ?- "." table)
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122 (modify-syntax-entry ?= "." table)
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123 (modify-syntax-entry ?< "." table)
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124 (modify-syntax-entry ?> "." table)
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125 (setq prolog-mode-syntax-table table)))
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126
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127 (define-abbrev-table 'prolog-mode-abbrev-table ())
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128
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129 (defun prolog-mode-variables ()
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130 (set-syntax-table prolog-mode-syntax-table)
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131 (setq local-abbrev-table prolog-mode-abbrev-table)
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132 (make-local-variable 'paragraph-start)
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133 (setq paragraph-start (concat "%%\\|$\\|" page-delimiter)) ;'%%..'
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134 (make-local-variable 'paragraph-separate)
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135 (setq paragraph-separate paragraph-start)
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136 (make-local-variable 'paragraph-ignore-fill-prefix)
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137 (setq paragraph-ignore-fill-prefix t)
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138 (make-local-variable 'indent-line-function)
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139 (setq indent-line-function 'prolog-indent-line)
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140 (make-local-variable 'comment-start)
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141 (setq comment-start "%")
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142 (make-local-variable 'comment-start-skip)
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143 (setq comment-start-skip "%+ *")
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144 (make-local-variable 'comment-column)
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145 (setq comment-column 48)
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146 (make-local-variable 'comment-indent-function)
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147 (setq comment-indent-function 'prolog-comment-indent))
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148
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149 (defun prolog-mode-commands (map)
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150 (define-key map "\t" 'prolog-indent-line)
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151 (define-key map "\e\C-x" 'prolog-consult-region))
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152
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153 (if prolog-mode-map
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154 nil
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155 (setq prolog-mode-map (make-sparse-keymap))
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156 (prolog-mode-commands prolog-mode-map))
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157
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158 ;;;###autoload
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159 (defun prolog-mode ()
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160 "Major mode for editing Prolog code for Prologs.
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161 Blank lines and `%%...' separate paragraphs. `%'s start comments.
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162 Commands:
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163 \\{prolog-mode-map}
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164 Entry to this mode calls the value of `prolog-mode-hook'
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165 if that value is non-nil."
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166 (interactive)
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167 (kill-all-local-variables)
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168 (use-local-map prolog-mode-map)
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169 (setq major-mode 'prolog-mode)
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170 (setq mode-name "Prolog")
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171 (prolog-mode-variables)
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172 (run-hooks 'prolog-mode-hook))
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173
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174 (defun prolog-indent-line (&optional whole-exp)
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175 "Indent current line as Prolog code.
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176 With argument, indent any additional lines of the same clause
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177 rigidly along with this one (not yet)."
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178 (interactive "p")
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179 (let ((indent (prolog-indent-level))
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180 (pos (- (point-max) (point))) beg)
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181 (beginning-of-line)
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182 (setq beg (point))
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183 (skip-chars-forward " \t")
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184 (if (zerop (- indent (current-column)))
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185 nil
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186 (delete-region beg (point))
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187 (indent-to indent))
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188 (if (> (- (point-max) pos) (point))
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189 (goto-char (- (point-max) pos)))
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190 ))
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191
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192 (defun prolog-indent-level ()
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193 "Compute prolog indentation level."
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194 (save-excursion
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195 (beginning-of-line)
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196 (skip-chars-forward " \t")
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197 (cond
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198 ((looking-at "%%%") 0) ;Large comment starts
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199 ((looking-at "%[^%]") comment-column) ;Small comment starts
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200 ((bobp) 0) ;Beginning of buffer
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201 (t
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202 (let ((empty t) ind more less)
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203 (if (looking-at ")")
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204 (setq less t) ;Find close
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205 (setq less nil))
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206 ;; See previous indentation
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207 (while empty
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208 (forward-line -1)
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209 (beginning-of-line)
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210 (if (bobp)
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211 (setq empty nil)
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212 (skip-chars-forward " \t")
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213 (if (not (or (looking-at "%[^%]") (looking-at "\n")))
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214 (setq empty nil))))
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215 (if (bobp)
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216 (setq ind 0) ;Beginning of buffer
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217 (setq ind (current-column))) ;Beginning of clause
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218 ;; See its beginning
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219 (if (looking-at "%%[^%]")
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220 ind
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221 ;; Real prolog code
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222 (if (looking-at "(")
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223 (setq more t) ;Find open
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224 (setq more nil))
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225 ;; See its tail
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226 (end-of-prolog-clause)
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227 (or (bobp) (forward-char -1))
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228 (cond ((looking-at "[,(;>]")
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229 (if (and more (looking-at "[^,]"))
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230 (+ ind prolog-indent-width) ;More indentation
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231 (max tab-width ind))) ;Same indentation
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232 ((looking-at "-") tab-width) ;TAB
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233 ((or less (looking-at "[^.]"))
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234 (max (- ind prolog-indent-width) 0)) ;Less indentation
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235 (t 0)) ;No indentation
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236 )))
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237 )))
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238
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239 (defun end-of-prolog-clause ()
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240 "Go to end of clause in this line."
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241 (beginning-of-line 1)
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242 (let* ((eolpos (save-excursion (end-of-line) (point))))
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243 (if (re-search-forward comment-start-skip eolpos 'move)
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244 (goto-char (match-beginning 0)))
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245 (skip-chars-backward " \t")))
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246
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247 (defun prolog-comment-indent ()
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248 "Compute prolog comment indentation."
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249 (cond ((looking-at "%%%") 0)
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250 ((looking-at "%%") (prolog-indent-level))
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251 (t
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252 (save-excursion
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253 (skip-chars-backward " \t")
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254 ;; Insert one space at least, except at left margin.
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255 (max (+ (current-column) (if (bolp) 0 1))
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256 comment-column)))
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257 ))
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258
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259
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260 ;;;
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261 ;;; Inferior prolog mode
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262 ;;;
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263 (defvar inferior-prolog-mode-map nil)
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264
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265 ;;;###autoload
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266 (defun inferior-prolog-mode ()
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267 "Major mode for interacting with an inferior Prolog process.
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268
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269 The following commands are available:
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270 \\{inferior-prolog-mode-map}
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271
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272 Entry to this mode calls the value of `prolog-mode-hook' with no arguments,
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273 if that value is non-nil. Likewise with the value of `comint-mode-hook'.
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274 `prolog-mode-hook' is called after `comint-mode-hook'.
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275
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276 You can send text to the inferior Prolog from other buffers
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277 using the commands `send-region', `send-string' and \\[prolog-consult-region].
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278
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279 Commands:
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280 Tab indents for Prolog; with argument, shifts rest
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281 of expression rigidly with the current line.
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282 Paragraphs are separated only by blank lines and '%%'.
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283 '%'s start comments.
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284
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285 Return at end of buffer sends line as input.
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286 Return not at end copies rest of line to end and sends it.
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287 \\[comint-kill-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
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288 \\[comint-interrupt-subjob] interrupts the shell or its current subjob if any.
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289 \\[comint-stop-subjob] stops. \\[comint-quit-subjob] sends quit signal."
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290 (interactive)
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291 (require 'comint)
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292 (comint-mode)
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293 (setq major-mode 'inferior-prolog-mode
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294 mode-name "Inferior Prolog"
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295 comint-prompt-regexp "^| [ ?][- ] *")
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296 (prolog-mode-variables)
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297 (if inferior-prolog-mode-map nil
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298 (setq inferior-prolog-mode-map (copy-keymap comint-mode-map))
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299 (prolog-mode-commands inferior-prolog-mode-map))
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300 (use-local-map inferior-prolog-mode-map)
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301 (run-hooks 'prolog-mode-hook))
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302
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303 ;;;###autoload
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304 (defun run-prolog ()
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305 "Run an inferior Prolog process, input and output via buffer *prolog*."
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306 (interactive)
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307 (require 'comint)
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308 (switch-to-buffer (make-comint "prolog" prolog-program-name))
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309 (inferior-prolog-mode))
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310
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311 (defun prolog-consult-region (compile beg end)
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312 "Send the region to the Prolog process made by \"M-x run-prolog\".
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313 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
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314 (interactive "P\nr")
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315 (save-excursion
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316 (if compile
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317 (send-string "prolog" prolog-compile-string)
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318 (send-string "prolog" prolog-consult-string))
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319 (send-region "prolog" beg end)
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320 (send-string "prolog" "\n") ;May be unnecessary
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321 (if prolog-eof-string
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322 (send-string "prolog" prolog-eof-string)
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323 (process-send-eof "prolog")))) ;Send eof to prolog process.
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324
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325 (defun prolog-consult-region-and-go (compile beg end)
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326 "Send the region to the inferior Prolog, and switch to *prolog* buffer.
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327 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
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328 (interactive "P\nr")
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329 (prolog-consult-region compile beg end)
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330 (switch-to-buffer "*prolog*"))
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331
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332 ;;; prolog.el ends here
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