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1 ;;; std11-parse.el --- STD 11 parser for GNU Emacs
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2
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3 ;; Copyright (C) 1995,1996 Free Software Foundation, Inc.
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Keywords: mail, news, RFC 822, STD 11
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7 ;; Version:
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8 ;; $Id: std11-parse.el,v 1.1 1997/06/03 04:18:36 steve Exp $
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9
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10 ;; This file is part of MU (Message Utilities).
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11
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12 ;; This program is free software; you can redistribute it and/or
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13 ;; modify it under the terms of the GNU General Public License as
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14 ;; published by the Free Software Foundation; either version 2, or (at
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15 ;; your option) any later version.
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16
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17 ;; This program is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Code:
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28
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29 (require 'std11)
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30 (require 'emu)
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31
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32
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33 ;;; @ lexical analyze
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34 ;;;
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35
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36 (defconst std11-space-chars " \t\n")
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37 (defconst std11-spaces-regexp (concat "[" std11-space-chars "]+"))
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38 (defconst std11-special-chars "][()<>@,;:\\<>.\"")
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39 (defconst std11-atom-regexp
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40 (concat "^[^" std11-special-chars std11-space-chars "]+"))
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41
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42 (defun std11-analyze-spaces (string)
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43 (if (and (string-match std11-spaces-regexp string)
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44 (= (match-beginning 0) 0))
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45 (let ((end (match-end 0)))
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46 (cons (cons 'spaces (substring string 0 end))
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47 (substring string end)
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48 ))))
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49
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50 (defun std11-analyze-special (str)
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51 (if (and (> (length str) 0)
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52 (find (aref str 0) std11-special-chars)
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53 )
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54 (cons (cons 'specials (substring str 0 1))
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55 (substring str 1)
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56 )))
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57
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58 (defun std11-analyze-atom (str)
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59 (if (string-match std11-atom-regexp str)
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60 (let ((end (match-end 0)))
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61 (cons (cons 'atom (substring str 0 end))
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62 (substring str end)
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63 ))))
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64
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65 (defun std11-check-enclosure (str open close &optional recursive from)
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66 (let ((len (length str))
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67 (i (or from 0))
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68 )
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69 (if (and (> len i)
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70 (eq (aref str i) open))
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71 (let (p chr)
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72 (setq i (1+ i))
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73 (catch 'tag
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74 (while (< i len)
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75 (setq chr (aref str i))
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76 (cond ((eq chr ?\\)
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77 (setq i (1+ i))
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78 (if (>= i len)
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79 (throw 'tag nil)
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80 )
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81 (setq i (1+ i))
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82 )
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83 ((eq chr close)
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84 (throw 'tag (1+ i))
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85 )
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86 ((eq chr open)
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87 (if (and recursive
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88 (setq p (std11-check-enclosure
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89 str open close recursive i))
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90 )
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91 (setq i p)
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92 (throw 'tag nil)
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93 ))
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94 (t
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95 (setq i (1+ i))
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96 ))
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97 ))))))
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98
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99 (defun std11-analyze-quoted-string (str)
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100 (let ((p (std11-check-enclosure str ?\" ?\")))
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101 (if p
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102 (cons (cons 'quoted-string (substring str 1 (1- p)))
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103 (substring str p))
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104 )))
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105
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106 (defun std11-analyze-domain-literal (str)
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107 (let ((p (std11-check-enclosure str ?\[ ?\])))
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108 (if p
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109 (cons (cons 'domain-literal (substring str 1 (1- p)))
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110 (substring str p))
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111 )))
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112
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113 (defun std11-analyze-comment (str)
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114 (let ((p (std11-check-enclosure str ?\( ?\) t)))
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115 (if p
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116 (cons (cons 'comment (substring str 1 (1- p)))
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117 (substring str p))
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118 )))
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119
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120 (defun std11-lexical-analyze (str)
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121 (let (dest ret)
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122 (while (not (string-equal str ""))
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123 (setq ret
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124 (or (std11-analyze-quoted-string str)
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125 (std11-analyze-domain-literal str)
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126 (std11-analyze-comment str)
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127 (std11-analyze-spaces str)
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128 (std11-analyze-special str)
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129 (std11-analyze-atom str)
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130 '((error) . "")
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131 ))
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132 (setq dest (cons (car ret) dest))
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133 (setq str (cdr ret))
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134 )
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135 (nreverse dest)
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136 ))
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137
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138
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139 ;;; @ parser
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140 ;;;
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141
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142 (defun std11-ignored-token-p (token)
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143 (let ((type (car token)))
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144 (or (eq type 'spaces)(eq type 'comment))
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145 ))
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146
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147 (defun std11-parse-token (lal)
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148 (let (token itl)
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149 (while (and lal
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150 (progn
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151 (setq token (car lal))
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152 (std11-ignored-token-p token)
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153 ))
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154 (setq lal (cdr lal))
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155 (setq itl (cons token itl))
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156 )
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157 (cons (nreverse (cons token itl))
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158 (cdr lal))
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159 ))
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160
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161 (defun std11-parse-ascii-token (lal)
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162 (let (token itl parsed token-value)
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163 (while (and lal
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164 (setq token (car lal))
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165 (if (and (setq token-value (cdr token))
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166 (find-non-ascii-charset-string token-value)
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167 )
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168 (setq token nil)
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169 (std11-ignored-token-p token)
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170 ))
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171 (setq lal (cdr lal))
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172 (setq itl (cons token itl))
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173 )
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174 (if (and token
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175 (setq parsed (nreverse (cons token itl)))
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176 )
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177 (cons parsed (cdr lal))
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178 )))
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179
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180 (defun std11-parse-token-or-comment (lal)
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181 (let (token itl)
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182 (while (and lal
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183 (progn
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184 (setq token (car lal))
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185 (eq (car token) 'spaces)
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186 ))
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187 (setq lal (cdr lal))
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188 (setq itl (cons token itl))
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189 )
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190 (cons (nreverse (cons token itl))
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191 (cdr lal))
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192 ))
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193
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194 (defun std11-parse-word (lal)
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195 (let ((ret (std11-parse-ascii-token lal)))
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196 (if ret
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197 (let ((elt (car ret))
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198 (rest (cdr ret))
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199 )
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200 (if (or (assq 'atom elt)
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201 (assq 'quoted-string elt))
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202 (cons (cons 'word elt) rest)
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203 )))))
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204
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205 (defun std11-parse-word-or-comment (lal)
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206 (let ((ret (std11-parse-token-or-comment lal)))
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207 (if ret
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208 (let ((elt (car ret))
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209 (rest (cdr ret))
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210 )
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211 (cond ((or (assq 'atom elt)
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212 (assq 'quoted-string elt))
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213 (cons (cons 'word elt) rest)
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214 )
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215 ((assq 'comment elt)
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216 (cons (cons 'comment-word elt) rest)
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217 ))
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218 ))))
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219
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220 (defun std11-parse-phrase (lal)
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221 (let (ret phrase)
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222 (while (setq ret (std11-parse-word-or-comment lal))
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223 (setq phrase (append phrase (cdr (car ret))))
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224 (setq lal (cdr ret))
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225 )
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226 (if phrase
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227 (cons (cons 'phrase phrase) lal)
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228 )))
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229
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230 (defun std11-parse-local-part (lal)
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231 (let ((ret (std11-parse-word lal)))
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232 (if ret
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233 (let ((local-part (cdr (car ret))) dot)
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234 (setq lal (cdr ret))
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235 (while (and (setq ret (std11-parse-ascii-token lal))
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236 (setq dot (car ret))
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237 (string-equal (cdr (assq 'specials dot)) ".")
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238 (setq ret (std11-parse-word (cdr ret)))
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239 (setq local-part
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240 (append local-part dot (cdr (car ret)))
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241 )
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242 (setq lal (cdr ret))
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243 ))
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244 (cons (cons 'local-part local-part) lal)
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245 ))))
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246
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247 (defun std11-parse-sub-domain (lal)
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248 (let ((ret (std11-parse-ascii-token lal)))
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249 (if ret
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250 (let ((sub-domain (car ret)))
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251 (if (or (assq 'atom sub-domain)
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252 (assq 'domain-literal sub-domain)
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253 )
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254 (cons (cons 'sub-domain sub-domain)
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255 (cdr ret)
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256 )
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257 )))))
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258
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259 (defun std11-parse-domain (lal)
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260 (let ((ret (std11-parse-sub-domain lal)))
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261 (if ret
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262 (let ((domain (cdr (car ret))) dot)
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263 (setq lal (cdr ret))
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264 (while (and (setq ret (std11-parse-ascii-token lal))
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265 (setq dot (car ret))
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266 (string-equal (cdr (assq 'specials dot)) ".")
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267 (setq ret (std11-parse-sub-domain (cdr ret)))
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268 (setq domain
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269 (append domain dot (cdr (car ret)))
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270 )
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271 (setq lal (cdr ret))
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272 ))
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273 (cons (cons 'domain domain) lal)
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274 ))))
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275
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276 (defun std11-parse-at-domain (lal)
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277 (let ((ret (std11-parse-ascii-token lal)) at-sign)
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278 (if (and ret
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279 (setq at-sign (car ret))
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280 (string-equal (cdr (assq 'specials at-sign)) "@")
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281 (setq ret (std11-parse-domain (cdr ret)))
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282 )
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283 (cons (cons 'at-domain (append at-sign (cdr (car ret))))
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284 (cdr ret))
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285 )))
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286
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287 (defun std11-parse-addr-spec (lal)
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288 (let ((ret (std11-parse-local-part lal))
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289 addr)
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290 (if (and ret
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291 (prog1
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292 (setq addr (cdr (car ret)))
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293 (setq lal (cdr ret))
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294 (and (setq ret (std11-parse-at-domain lal))
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295 (setq addr (append addr (cdr (car ret))))
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296 (setq lal (cdr ret))
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297 )))
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298 (cons (cons 'addr-spec addr) lal)
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299 )))
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300
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301 (defun std11-parse-route (lal)
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302 (let ((ret (std11-parse-at-domain lal))
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303 route comma colon)
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304 (if (and ret
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305 (progn
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306 (setq route (cdr (car ret)))
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307 (setq lal (cdr ret))
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308 (while (and (setq ret (std11-parse-ascii-token lal))
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309 (setq comma (car ret))
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310 (string-equal (cdr (assq 'specials comma)) ",")
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311 (setq ret (std11-parse-at-domain (cdr ret)))
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312 )
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313 (setq route (append route comma (cdr (car ret))))
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314 (setq lal (cdr ret))
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315 )
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316 (and (setq ret (std11-parse-ascii-token lal))
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317 (setq colon (car ret))
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318 (string-equal (cdr (assq 'specials colon)) ":")
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319 (setq route (append route colon))
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320 )
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321 ))
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322 (cons (cons 'route route)
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323 (cdr ret)
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324 )
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325 )))
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326
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327 (defun std11-parse-route-addr (lal)
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328 (let ((ret (std11-parse-ascii-token lal))
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329 < route addr-spec >)
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330 (if (and ret
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331 (setq < (car ret))
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332 (string-equal (cdr (assq 'specials <)) "<")
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333 (setq lal (cdr ret))
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334 (progn (and (setq ret (std11-parse-route lal))
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335 (setq route (cdr (car ret)))
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336 (setq lal (cdr ret))
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337 )
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338 (setq ret (std11-parse-addr-spec lal))
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339 )
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340 (setq addr-spec (cdr (car ret)))
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341 (setq lal (cdr ret))
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342 (setq ret (std11-parse-ascii-token lal))
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343 (setq > (car ret))
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344 (string-equal (cdr (assq 'specials >)) ">")
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345 )
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346 (cons (cons 'route-addr (append route addr-spec))
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347 (cdr ret)
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348 )
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349 )))
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350
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351 (defun std11-parse-phrase-route-addr (lal)
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352 (let ((ret (std11-parse-phrase lal)) phrase)
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353 (if ret
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354 (progn
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355 (setq phrase (cdr (car ret)))
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356 (setq lal (cdr ret))
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357 ))
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358 (if (setq ret (std11-parse-route-addr lal))
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359 (cons (list 'phrase-route-addr
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360 phrase
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361 (cdr (car ret)))
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362 (cdr ret))
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363 )))
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364
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365 (defun std11-parse-mailbox (lal)
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366 (let ((ret (or (std11-parse-phrase-route-addr lal)
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367 (std11-parse-addr-spec lal)))
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368 mbox comment)
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369 (if (and ret
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370 (prog1
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371 (setq mbox (car ret))
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372 (setq lal (cdr ret))
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373 (if (and (setq ret (std11-parse-token-or-comment lal))
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374 (setq comment (cdr (assq 'comment (car ret))))
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375 )
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376 (setq lal (cdr ret))
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377 )))
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378 (cons (list 'mailbox mbox comment)
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379 lal)
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380 )))
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381
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382 (defun std11-parse-group (lal)
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383 (let ((ret (std11-parse-phrase lal))
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384 phrase colon comma mbox semicolon)
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385 (if (and ret
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386 (setq phrase (cdr (car ret)))
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387 (setq lal (cdr ret))
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388 (setq ret (std11-parse-ascii-token lal))
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389 (setq colon (car ret))
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390 (string-equal (cdr (assq 'specials colon)) ":")
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391 (setq lal (cdr ret))
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392 (progn
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393 (and (setq ret (std11-parse-mailbox lal))
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394 (setq mbox (list (car ret)))
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395 (setq lal (cdr ret))
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396 (progn
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397 (while (and (setq ret (std11-parse-ascii-token lal))
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398 (setq comma (car ret))
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399 (string-equal
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400 (cdr (assq 'specials comma)) ",")
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401 (setq lal (cdr ret))
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402 (setq ret (std11-parse-mailbox lal))
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403 (setq mbox (cons (car ret) mbox))
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404 (setq lal (cdr ret))
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405 )
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406 )))
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407 (and (setq ret (std11-parse-ascii-token lal))
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408 (setq semicolon (car ret))
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409 (string-equal (cdr (assq 'specials semicolon)) ";")
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410 )))
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411 (cons (list 'group phrase (nreverse mbox))
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412 (cdr ret)
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413 )
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414 )))
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415
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416 (defun std11-parse-address (lal)
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417 (or (std11-parse-group lal)
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418 (std11-parse-mailbox lal)
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419 ))
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420
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421 (defun std11-parse-addresses (lal)
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422 (let ((ret (std11-parse-address lal)))
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423 (if ret
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424 (let ((dest (list (car ret))))
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425 (setq lal (cdr ret))
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426 (while (and (setq ret (std11-parse-ascii-token lal))
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427 (string-equal (cdr (assq 'specials (car ret))) ",")
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428 (setq ret (std11-parse-address (cdr ret)))
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429 )
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430 (setq dest (cons (car ret) dest))
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431 (setq lal (cdr ret))
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432 )
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433 (nreverse dest)
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434 ))))
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435
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436
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437 ;;; @ end
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438 ;;;
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439
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440 (provide 'std11-parse)
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441
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442 ;;; std11-parse.el ends here
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