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428
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1 /* Drag'n'Drop definitions
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2 created 03-may-98 by Oliver Graf <ograf@fga.de>
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3 Copyright (C) 1998 Oliver Graf <ograf@fga.de>
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4 Copyright (C) 2004 Ben Wing.
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428
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Not in FSF. */
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24
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25 /* This file should be Mule-ized. */
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26
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27 /* A short introduction to the new Drag'n'Drop Model:
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28
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29 Currently only drops from OffiX are implemented.
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30
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31 A drop generates a extended misc-user-event, as defined in events.[ch].
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32 This event contains the same as a eval and a button event.
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33 The function of a drop is set to 'dragdrop-drop-dispatch' which will be
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34 defined in ../lisp/dragdrop.el.
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35 The object of the misc-user-event has the following format:
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36 ( TYPE . DATA )
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37 TYPE is one of 'dragdrop-MIME and 'dragdrop-URL
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38 DATA - if TYPE is 'dragdrop-URL, DATA is a list of valid URL strings. It
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39 is always a list, also if only one URL string is within it.
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40 - if TYPE is 'dragdrop-MIME, DATA is a list of MIME elements.
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41 Each can be a string or a list.
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42 if it is a string it is the pure MIME data complete with header
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43 and body.
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44 if it is a list it should look like
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45 ( MIME-TYPE MIME-ENCODING MIME-DATA )
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46 MIME-TYPE list of type and key.value conses. Same as in tm-view
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47 MIME-ENC the same (a string in this case)
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48 MIME-DATA is a string
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49 */
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50
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51 #include <config.h>
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52 #include "lisp.h"
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53 #include "dragdrop.h"
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54
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55 /* The supported protocol list */
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56 Lisp_Object Vdragdrop_protocols;
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57
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58 /* Drag'n'Drop data types known by XEmacs */
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59 Lisp_Object Qdragdrop_MIME;
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60 Lisp_Object Qdragdrop_URL;
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61
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62 /* External defined functions to handle Drag'n'Drop */
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63 Lisp_Object Qdragdrop_drop_dispatch;
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64
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65 /* from wget -- thanxx Hrvoje */
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66 /* A list of unsafe characters for encoding, as per RFC1738. '@' and
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67 ':' (not listed in RFC) were added because of user/password
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68 encoding, and \033 for safe printing. */
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69
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70 #define URL_UNSAFE " <>\"#%{}|\\^~[]`@:\033"
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71
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72 /* HEX digit -> ASCII char */
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73 #define HEXD2ASC(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'A'))
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74
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75 /* Encodes the unsafe characters (listed in URL_UNSAFE) in a given
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76 string, returning a malloc-ed %XX encoded string.
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77 if method is != NULL it is prepended to the string. */
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78 Ibyte *
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79 dnd_url_hexify_string (const Ibyte *s, const Ibyte *m)
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80 {
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81 const Ibyte *b;
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82 Ibyte *p, *res;
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83 Bytecount i;
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84
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85 b = s;
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86 for (i = 0; *s; s++, i++)
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87 if (strchr (URL_UNSAFE, *s))
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88 i += 2; /* Two more characters (hex digits) */
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89 if (m)
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90 {
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91 res = xnew_ibytes (i + ITEXT_ZTERM_SIZE + qxestrlen (m));
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92 qxestrcpy (res, m);
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93 p = res + qxestrlen (m);
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94 }
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95 else
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96 {
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97 res = xnew_ibytes (i + ITEXT_ZTERM_SIZE);
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98 p = res;
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99 }
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100 for (s = b; *s; s++)
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101 if (strchr (URL_UNSAFE, *s))
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102 {
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103 const Ibyte c = *s;
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104 *p++ = '%';
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105 *p++ = HEXD2ASC (c >> 4);
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106 *p++ = HEXD2ASC (c & 0xf);
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107 }
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108 else
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109 *p++ = *s;
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110 *p = '\0';
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111 return res;
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112 }
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113
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114 void
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115 syms_of_dragdrop (void)
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116 {
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117 DEFSYMBOL (Qdragdrop_MIME);
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118 DEFSYMBOL (Qdragdrop_URL);
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119 DEFSYMBOL (Qdragdrop_drop_dispatch);
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120 }
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121
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122 void
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123 vars_of_dragdrop (void)
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124 {
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125 Fprovide (intern ("dragdrop-api"));
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126
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127 DEFVAR_CONST_LISP ("dragdrop-protocols", &Vdragdrop_protocols /*
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128 A list of supported Drag'n'drop protocols.
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129 Each element is the feature symbol of the protocol.
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130 */ );
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131
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132 Vdragdrop_protocols = Qnil;
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133
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134 #ifdef HAVE_MS_WINDOWS
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135 Vdragdrop_protocols = Fcons (Qmswindows, Vdragdrop_protocols);
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136 #endif
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137 #ifdef HAVE_CDE
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138 Vdragdrop_protocols = Fcons (intern ("cde"), Vdragdrop_protocols);
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139 #endif
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140 #ifdef HAVE_OFFIX_DND
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141 Vdragdrop_protocols = Fcons (intern ("offix"), Vdragdrop_protocols);
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142 #endif
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143 #ifdef HAVE_GTK
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144 Vdragdrop_protocols = Fcons (Qgtk, Vdragdrop_protocols);
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145 #endif
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146 }
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