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1 ;;; scheme.el --- Scheme mode, and its idiosyncratic commands.
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2 ;; Keywords: languages, lisp
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3
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4 ;; Copyright (C) 1986, 1987, 1988 Free Software Foundation, Inc.
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5 ;; Adapted from Lisp mode by Bill Rozas, jinx@prep.
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23
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24 ;; Initially a query replace of Lisp mode, except for the indentation
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25 ;; of special forms. Probably the code should be merged at some point
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26 ;; so that there is sharing between both libraries.
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27
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28 (provide 'scheme)
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29
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30 (defvar scheme-mode-syntax-table nil "")
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31 (if (not scheme-mode-syntax-table)
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32 (let ((i 0))
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33 (setq scheme-mode-syntax-table (make-syntax-table))
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34 (set-syntax-table scheme-mode-syntax-table)
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35
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36 ;; Default is atom-constituent.
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37 (while (< i 256)
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38 (modify-syntax-entry i "_ ")
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39 (setq i (1+ i)))
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40
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41 ;; Word components.
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42 (setq i ?0)
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43 (while (<= i ?9)
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44 (modify-syntax-entry i "w ")
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45 (setq i (1+ i)))
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46 (setq i ?A)
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47 (while (<= i ?Z)
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48 (modify-syntax-entry i "w ")
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49 (setq i (1+ i)))
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50 (setq i ?a)
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51 (while (<= i ?z)
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52 (modify-syntax-entry i "w ")
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53 (setq i (1+ i)))
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54
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55 ;; Whitespace
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56 (modify-syntax-entry ?\t " ")
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57 (modify-syntax-entry ?\n "> ")
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58 (modify-syntax-entry ?\f " ")
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59 (modify-syntax-entry ?\r " ")
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60 (modify-syntax-entry ? " ")
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61
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62 ;; These characters are delimiters but otherwise undefined.
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63 ;; Brackets and braces balance for editing convenience.
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64 (modify-syntax-entry ?[ "(] ")
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65 (modify-syntax-entry ?] ")[ ")
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66 (modify-syntax-entry ?{ "(} ")
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67 (modify-syntax-entry ?} "){ ")
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68 (modify-syntax-entry ?\| " 23")
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69
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70 ;; Other atom delimiters
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71 (modify-syntax-entry ?\( "() ")
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72 (modify-syntax-entry ?\) ")( ")
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73 (modify-syntax-entry ?\; "< ")
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74 (modify-syntax-entry ?\" "\" ")
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75 (modify-syntax-entry ?' " p")
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76 (modify-syntax-entry ?` " p")
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77
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78 ;; Special characters
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79 (modify-syntax-entry ?, "_ p")
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80 (modify-syntax-entry ?@ "_ p")
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81 (modify-syntax-entry ?# "_ p14")
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82 (modify-syntax-entry ?\\ "\\ ")))
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83
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84 (defvar scheme-mode-abbrev-table nil "")
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85 (define-abbrev-table 'scheme-mode-abbrev-table ())
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86
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87 (defun scheme-mode-variables ()
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88 (set-syntax-table scheme-mode-syntax-table)
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89 (setq local-abbrev-table scheme-mode-abbrev-table)
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90 (make-local-variable 'paragraph-start)
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91 (setq paragraph-start (concat "^$\\|" page-delimiter))
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92 (make-local-variable 'paragraph-separate)
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93 (setq paragraph-separate paragraph-start)
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94 (make-local-variable 'paragraph-ignore-fill-prefix)
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95 (setq paragraph-ignore-fill-prefix t)
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96 (make-local-variable 'indent-line-function)
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97 (setq indent-line-function 'scheme-indent-line)
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98 (make-local-variable 'comment-start)
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99 (setq comment-start ";")
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100 (make-local-variable 'comment-start-skip)
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101 (setq comment-start-skip ";+[ \t]*")
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102 (make-local-variable 'comment-column)
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103 (setq comment-column 40)
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104 (make-local-variable 'comment-indent-hook)
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105 (setq comment-indent-hook 'scheme-comment-indent)
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106 (setq mode-line-process '("" scheme-mode-line-process)))
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107
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108 (defvar scheme-mode-line-process "")
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109
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110 (defun scheme-mode-commands (map)
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111 (define-key map "\t" 'scheme-indent-line)
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112 (define-key map "\177" 'backward-delete-char-untabify)
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113 (define-key map "\e\C-q" 'scheme-indent-sexp))
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114
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115 (defvar scheme-mode-map nil)
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116 (if (not scheme-mode-map)
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117 (progn
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118 (setq scheme-mode-map (make-sparse-keymap))
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119 (scheme-mode-commands scheme-mode-map)))
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120
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121 ;;;###autoload
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122 (defun scheme-mode ()
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123 "Major mode for editing Scheme code.
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124 Editing commands are similar to those of lisp-mode.
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125
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126 In addition, if an inferior Scheme process is running, some additional
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127 commands will be defined, for evaluating expressions and controlling
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128 the interpreter, and the state of the process will be displayed in the
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129 modeline of all Scheme buffers. The names of commands that interact
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130 with the Scheme process start with \"xscheme-\". For more information
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131 see the documentation for xscheme-interaction-mode.
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132
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133 Commands:
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134 Delete converts tabs to spaces as it moves back.
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135 Blank lines separate paragraphs. Semicolons start comments.
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136 \\{scheme-mode-map}
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137 Entry to this mode calls the value of scheme-mode-hook
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138 if that value is non-nil."
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139 (interactive)
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140 (kill-all-local-variables)
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141 (scheme-mode-initialize)
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142 (scheme-mode-variables)
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143 (run-hooks 'scheme-mode-hook))
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144
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145 (defun scheme-mode-initialize ()
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146 (use-local-map scheme-mode-map)
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147 (setq major-mode 'scheme-mode)
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148 (setq mode-name "Scheme"))
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149
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150 (defvar scheme-mit-dialect t
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151 "If non-nil, scheme mode is specialized for MIT Scheme.
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152 Set this to nil if you normally use another dialect.")
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153
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154 (defun scheme-comment-indent (&optional pos)
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155 (save-excursion
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156 (if pos (goto-char pos))
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157 (cond ((looking-at ";;;") (current-column))
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158 ((looking-at ";;")
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159 (let ((tem (calculate-scheme-indent)))
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160 (if (listp tem) (car tem) tem)))
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161 (t
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162 (skip-chars-backward " \t")
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163 (max (if (bolp) 0 (1+ (current-column)))
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164 comment-column)))))
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165
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166 (defvar scheme-indent-offset nil "")
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167 (defvar scheme-indent-function 'scheme-indent-function "")
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168
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169 (defun scheme-indent-line (&optional whole-exp)
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170 "Indent current line as Scheme code.
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171 With argument, indent any additional lines of the same expression
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172 rigidly along with this one."
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173 (interactive "P")
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174 (let ((indent (calculate-scheme-indent)) shift-amt beg end
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175 (pos (- (point-max) (point))))
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176 (beginning-of-line)
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177 (setq beg (point))
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178 (skip-chars-forward " \t")
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179 (if (looking-at "[ \t]*;;;")
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180 ;; Don't alter indentation of a ;;; comment line.
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181 nil
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182 (if (listp indent) (setq indent (car indent)))
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183 (setq shift-amt (- indent (current-column)))
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184 (if (zerop shift-amt)
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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 initial point was within line's indentation,
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189 ;; position after the indentation. Else stay at same point in text.
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190 (if (> (- (point-max) pos) (point))
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191 (goto-char (- (point-max) pos)))
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192 ;; If desired, shift remaining lines of expression the same amount.
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193 (and whole-exp (not (zerop shift-amt))
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194 (save-excursion
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195 (goto-char beg)
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196 (forward-sexp 1)
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197 (setq end (point))
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198 (goto-char beg)
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199 (forward-line 1)
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200 (setq beg (point))
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201 (> end beg))
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202 (indent-code-rigidly beg end shift-amt)))))
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203
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204 (defun calculate-scheme-indent (&optional parse-start)
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205 "Return appropriate indentation for current line as scheme code.
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206 In usual case returns an integer: the column to indent to.
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207 Can instead return a list, whose car is the column to indent to.
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208 This means that following lines at the same level of indentation
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209 should not necessarily be indented the same way.
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210 The second element of the list is the buffer position
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211 of the start of the containing expression."
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212 (save-excursion
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213 (beginning-of-line)
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214 (let ((indent-point (point)) state paren-depth desired-indent (retry t)
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215 last-sexp containing-sexp first-sexp-list-p)
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216 (if parse-start
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217 (goto-char parse-start)
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218 (beginning-of-defun))
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219 ;; Find outermost containing sexp
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220 (while (< (point) indent-point)
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221 (setq state (parse-partial-sexp (point) indent-point 0)))
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222 ;; Find innermost containing sexp
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223 (while (and retry (setq paren-depth (car state)) (> paren-depth 0))
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224 (setq retry nil)
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225 (setq last-sexp (nth 2 state))
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226 (setq containing-sexp (car (cdr state)))
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227 ;; Position following last unclosed open.
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228 (goto-char (1+ containing-sexp))
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229 ;; Is there a complete sexp since then?
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230 (if (and last-sexp (> last-sexp (point)))
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231 ;; Yes, but is there a containing sexp after that?
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232 (let ((peek (parse-partial-sexp last-sexp indent-point 0)))
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233 (if (setq retry (car (cdr peek))) (setq state peek))))
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234 (if (not retry)
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235 ;; Innermost containing sexp found
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236 (progn
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237 (goto-char (1+ containing-sexp))
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238 (if (not last-sexp)
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239 ;; indent-point immediately follows open paren.
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240 ;; Don't call hook.
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241 (setq desired-indent (current-column))
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242 ;; Move to first sexp after containing open paren
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243 (parse-partial-sexp (point) last-sexp 0 t)
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244 (setq first-sexp-list-p (looking-at "\\s("))
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245 (cond
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246 ((> (save-excursion (forward-line 1) (point))
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247 last-sexp)
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248 ;; Last sexp is on same line as containing sexp.
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249 ;; It's almost certainly a function call.
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250 (parse-partial-sexp (point) last-sexp 0 t)
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251 (if (/= (point) last-sexp)
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252 ;; Indent beneath first argument or, if only one sexp
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253 ;; on line, indent beneath that.
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254 (progn (forward-sexp 1)
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255 (parse-partial-sexp (point) last-sexp 0 t)))
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256 (backward-prefix-chars))
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257 (t
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258 ;; Indent beneath first sexp on same line as last-sexp.
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259 ;; Again, it's almost certainly a function call.
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260 (goto-char last-sexp)
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261 (beginning-of-line)
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262 (parse-partial-sexp (point) last-sexp 0 t)
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263 (backward-prefix-chars)))))))
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264 ;; If looking at a list, don't call hook.
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265 (if first-sexp-list-p
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266 (setq desired-indent (current-column)))
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267 ;; Point is at the point to indent under unless we are inside a string.
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268 ;; Call indentation hook except when overriden by scheme-indent-offset
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269 ;; or if the desired indentation has already been computed.
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270 (cond ((car (nthcdr 3 state))
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271 ;; Inside a string, don't change indentation.
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272 (goto-char indent-point)
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273 (skip-chars-forward " \t")
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274 (setq desired-indent (current-column)))
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275 ((and (integerp scheme-indent-offset) containing-sexp)
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276 ;; Indent by constant offset
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277 (goto-char containing-sexp)
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278 (setq desired-indent (+ scheme-indent-offset (current-column))))
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279 ((not (or desired-indent
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280 (and (boundp 'scheme-indent-function)
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281 scheme-indent-function
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282 (not retry)
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283 (setq desired-indent
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284 (funcall scheme-indent-function
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285 indent-point state)))))
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286 ;; Use default indentation if not computed yet
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287 (setq desired-indent (current-column))))
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288 desired-indent)))
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289
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290 (defun scheme-indent-function (indent-point state)
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291 (let ((normal-indent (current-column)))
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292 (save-excursion
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293 (goto-char (1+ (car (cdr state))))
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294 (re-search-forward "\\sw\\|\\s_")
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295 (if (/= (point) (car (cdr state)))
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296 (let ((function (buffer-substring (progn (forward-char -1) (point))
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297 (progn (forward-sexp 1) (point))))
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298 method)
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299 ;; Who cares about this, really?
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300 ;(if (not (string-match "\\\\\\||" function)))
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301 (setq function (downcase function))
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302 (setq method (get (intern-soft function) 'scheme-indent-function))
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303 (cond ((integerp method)
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304 (scheme-indent-specform method state indent-point))
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305 (method
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306 (funcall method state indent-point))
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307 ((and (> (length function) 3)
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308 (string-equal (substring function 0 3) "def"))
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309 (scheme-indent-defform state indent-point))))))))
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310
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311 (defvar scheme-body-indent 2 "")
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312
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313 (defun scheme-indent-specform (count state indent-point)
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314 (let ((containing-form-start (car (cdr state))) (i count)
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315 body-indent containing-form-column)
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316 ;; Move to the start of containing form, calculate indentation
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317 ;; to use for non-distinguished forms (> count), and move past the
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318 ;; function symbol. scheme-indent-function guarantees that there is at
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319 ;; least one word or symbol character following open paren of containing
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320 ;; form.
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321 (goto-char containing-form-start)
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322 (setq containing-form-column (current-column))
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323 (setq body-indent (+ scheme-body-indent containing-form-column))
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324 (forward-char 1)
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325 (forward-sexp 1)
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326 ;; Now find the start of the last form.
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327 (parse-partial-sexp (point) indent-point 1 t)
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328 (while (and (< (point) indent-point)
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329 (condition-case nil
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330 (progn
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331 (setq count (1- count))
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332 (forward-sexp 1)
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333 (parse-partial-sexp (point) indent-point 1 t))
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334 (error nil))))
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335 ;; Point is sitting on first character of last (or count) sexp.
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336 (cond ((> count 0)
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337 ;; A distinguished form. Use double scheme-body-indent.
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338 (list (+ containing-form-column (* 2 scheme-body-indent))
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339 containing-form-start))
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340 ;; A non-distinguished form. Use body-indent if there are no
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341 ;; distinguished forms and this is the first undistinguished
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342 ;; form, or if this is the first undistinguished form and
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343 ;; the preceding distinguished form has indentation at least
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344 ;; as great as body-indent.
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345 ((and (= count 0)
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346 (or (= i 0)
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347 (<= body-indent normal-indent)))
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348 body-indent)
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349 (t
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350 normal-indent))))
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351
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352 (defun scheme-indent-defform (state indent-point)
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353 (goto-char (car (cdr state)))
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354 (forward-line 1)
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355 (if (> (point) (car (cdr (cdr state))))
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356 (progn
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357 (goto-char (car (cdr state)))
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358 (+ scheme-body-indent (current-column)))))
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359
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360 ;;; Let is different in Scheme
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361
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362 (defun would-be-symbol (string)
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363 (not (string-equal (substring string 0 1) "(")))
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364
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365 (defun next-sexp-as-string ()
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366 ;; Assumes that protected by a save-excursion
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367 (forward-sexp 1)
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368 (let ((the-end (point)))
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369 (backward-sexp 1)
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370 (buffer-substring (point) the-end)))
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371
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372 ;; This is correct but too slow.
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373 ;; The one below works almost always.
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374 ;;(defun scheme-let-indent (state indent-point)
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375 ;; (if (would-be-symbol (next-sexp-as-string))
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376 ;; (scheme-indent-specform 2 state indent-point)
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377 ;; (scheme-indent-specform 1 state indent-point)))
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378
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379 (defun scheme-let-indent (state indent-point)
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380 (skip-chars-forward " \t")
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381 (if (looking-at "[a-zA-Z0-9+-*/?!@$%^&_:~]")
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382 (scheme-indent-specform 2 state indent-point)
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383 (scheme-indent-specform 1 state indent-point)))
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384
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385 ;; (put 'begin 'scheme-indent-function 0), say, causes begin to be indented
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386 ;; like defun if the first form is placed on the next line, otherwise
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387 ;; it is indented like any other form (i.e. forms line up under first).
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388
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389 (put 'begin 'scheme-indent-function 0)
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390 (put 'case 'scheme-indent-function 1)
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391 (put 'delay 'scheme-indent-function 0)
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392 (put 'do 'scheme-indent-function 2)
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393 (put 'lambda 'scheme-indent-function 1)
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394 (put 'let 'scheme-indent-function 'scheme-let-indent)
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395 (put 'let* 'scheme-indent-function 1)
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396 (put 'letrec 'scheme-indent-function 1)
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397 (put 'sequence 'scheme-indent-function 0)
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398
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399 (put 'call-with-input-file 'scheme-indent-function 1)
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400 (put 'with-input-from-file 'scheme-indent-function 1)
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401 (put 'with-input-from-port 'scheme-indent-function 1)
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402 (put 'call-with-output-file 'scheme-indent-function 1)
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403 (put 'with-output-to-file 'scheme-indent-function 1)
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404 (put 'with-output-to-port 'scheme-indent-function 1)
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405
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406 ;;;; MIT Scheme specific indentation.
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407
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408 (if scheme-mit-dialect
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409 (progn
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410 (put 'fluid-let 'scheme-indent-function 1)
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411 (put 'in-package 'scheme-indent-function 1)
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412 (put 'let-syntax 'scheme-indent-function 1)
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413 (put 'local-declare 'scheme-indent-function 1)
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414 (put 'macro 'scheme-indent-function 1)
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415 (put 'make-environment 'scheme-indent-function 0)
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416 (put 'named-lambda 'scheme-indent-function 1)
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417 (put 'using-syntax 'scheme-indent-function 1)
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418
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419 (put 'with-input-from-string 'scheme-indent-function 1)
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420 (put 'with-output-to-string 'scheme-indent-function 0)
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421 (put 'with-values 'scheme-indent-function 1)
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422
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423 (put 'syntax-table-define 'scheme-indent-function 2)
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424 (put 'list-transform-positive 'scheme-indent-function 1)
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425 (put 'list-transform-negative 'scheme-indent-function 1)
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426 (put 'list-search-positive 'scheme-indent-function 1)
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427 (put 'list-search-negative 'scheme-indent-function 1)
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428
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429 (put 'access-components 'scheme-indent-function 1)
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430 (put 'assignment-components 'scheme-indent-function 1)
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431 (put 'combination-components 'scheme-indent-function 1)
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432 (put 'comment-components 'scheme-indent-function 1)
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433 (put 'conditional-components 'scheme-indent-function 1)
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434 (put 'disjunction-components 'scheme-indent-function 1)
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435 (put 'declaration-components 'scheme-indent-function 1)
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436 (put 'definition-components 'scheme-indent-function 1)
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437 (put 'delay-components 'scheme-indent-function 1)
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438 (put 'in-package-components 'scheme-indent-function 1)
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439 (put 'lambda-components 'scheme-indent-function 1)
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440 (put 'lambda-components* 'scheme-indent-function 1)
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441 (put 'lambda-components** 'scheme-indent-function 1)
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442 (put 'open-block-components 'scheme-indent-function 1)
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443 (put 'pathname-components 'scheme-indent-function 1)
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444 (put 'procedure-components 'scheme-indent-function 1)
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445 (put 'sequence-components 'scheme-indent-function 1)
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446 (put 'unassigned\?-components 'scheme-indent-function 1)
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447 (put 'unbound\?-components 'scheme-indent-function 1)
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448 (put 'variable-components 'scheme-indent-function 1)))
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449
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450 (defun scheme-indent-sexp ()
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451 "Indent each line of the list starting just after point."
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452 (interactive)
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453 (let ((indent-stack (list nil)) (next-depth 0) bol
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454 outer-loop-done inner-loop-done state this-indent)
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455 (save-excursion (forward-sexp 1))
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456 (save-excursion
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457 (setq outer-loop-done nil)
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458 (while (not outer-loop-done)
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459 (setq last-depth next-depth
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460 innerloop-done nil)
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461 (while (and (not innerloop-done)
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462 (not (setq outer-loop-done (eobp))))
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463 (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
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464 nil nil state))
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465 (setq next-depth (car state))
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466 (if (car (nthcdr 4 state))
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467 (progn (indent-for-comment)
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468 (end-of-line)
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469 (setcar (nthcdr 4 state) nil)))
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470 (if (car (nthcdr 3 state))
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471 (progn
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472 (forward-line 1)
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473 (setcar (nthcdr 5 state) nil))
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474 (setq innerloop-done t)))
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475 (if (setq outer-loop-done (<= next-depth 0))
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476 nil
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477 (while (> last-depth next-depth)
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478 (setq indent-stack (cdr indent-stack)
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479 last-depth (1- last-depth)))
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480 (while (< last-depth next-depth)
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481 (setq indent-stack (cons nil indent-stack)
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482 last-depth (1+ last-depth)))
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483 (forward-line 1)
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484 (setq bol (point))
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485 (skip-chars-forward " \t")
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486 (if (or (eobp) (looking-at "[;\n]"))
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487 nil
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488 (if (and (car indent-stack)
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489 (>= (car indent-stack) 0))
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490 (setq this-indent (car indent-stack))
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491 (let ((val (calculate-scheme-indent
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492 (if (car indent-stack) (- (car indent-stack))))))
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493 (if (integerp val)
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494 (setcar indent-stack
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495 (setq this-indent val))
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496 (setcar indent-stack (- (car (cdr val))))
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497 (setq this-indent (car val)))))
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498 (if (/= (current-column) this-indent)
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499 (progn (delete-region bol (point))
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500 (indent-to this-indent)))))))))
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