src/enriched.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999,2000 Hiroyuki Yamamoto
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include <glib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <ctype.h>
  24
  25 #include "enriched.h"
  26 #include "utils.h"
  27
  28 #define ERTFBUFSIZE     8192
  29
  30
  31 static ERTFState ertf_read_line         (ERTFParser     *parser);
  32 static void ertf_append_char            (ERTFParser     *parser,
  33                                          gchar           ch);
  34
  35 static ERTFState ertf_parse_tag         (ERTFParser     *parser);
  36 static void ertf_get_parenthesis        (ERTFParser     *parser,
  37                                          gchar          *buf,
  38                                          gint            len);
  39
  40 ERTFParser *ertf_parser_new(FILE *fp, CodeConverter *conv)
  41 {
  42         ERTFParser *parser;
  43
  44         g_return_val_if_fail(fp   != NULL, NULL);
  45         g_return_val_if_fail(conv != NULL, NULL);
  46
  47         parser             = g_new0(ERTFParser, 1);
  48         parser->fp         = fp;
  49         parser->conv       = conv;
  50         parser->str        = g_string_new(NULL);
  51         parser->buf        = g_string_new(NULL);
  52         parser->bufp       = parser->buf->str;
  53         parser->newline    = TRUE;
  54         parser->empty_line = TRUE;
  55         parser->space      = FALSE;
  56         parser->pre        = FALSE;
  57
  58         return parser;
  59 }
  60
  61 void ertf_parser_destroy(ERTFParser *parser)
  62 {
  63         g_string_free(parser->str, TRUE);
  64         g_string_free(parser->buf, TRUE);
  65         g_free(parser);
  66 }
  67
  68 gchar *ertf_parse(ERTFParser *parser)
  69 {
  70         parser->state = ERTF_NORMAL;
  71         g_string_truncate(parser->str, 0);
  72
  73         if (*parser->bufp == '\0') {
  74                 g_string_truncate(parser->buf, 0);
  75                 parser->bufp = parser->buf->str;
  76                 if (ertf_read_line(parser) == ERTF_EOF)
  77                         return NULL;
  78         }
  79
  80         while (*parser->bufp != '\0') {
  81                 switch (*parser->bufp) {
  82                         case '<':
  83                                 if (parser->str->len == 0)
  84                                         ertf_parse_tag(parser);
  85                                 else
  86                                         return parser->str->str;
  87                                 break;
  88                         case '\n':
  89                         case '\r':
  90                                 if (parser->bufp[0] == '\r' && parser->bufp[1] == '\n')
  91                                                 parser->bufp++;
  92
  93                                 if (!parser->pre) {
  94                                         /* When not pre (not <nofill>), 1 CRLF = SPACE, N>1 CRLF = N-1 CRLF*/
  95                                         if (!parser->newline) {
  96                                                 parser->newline = TRUE;
  97                                                 parser->space = TRUE;
  98                                         parser->bufp++;
  99                                         break;
 100                                         }
 101
 102                                 }
 103                         default:
 104                                 ertf_append_char(parser, *parser->bufp++);
 105                 }
 106         }
 107
 108         return parser->str->str;
 109 }
 110
 111 static ERTFState ertf_read_line(ERTFParser *parser)
 112 {
 113         gchar buf[ERTFBUFSIZE];
 114         gchar buf2[ERTFBUFSIZE];
 115         gint index;
 116
 117         if (fgets(buf, sizeof(buf), parser->fp) == NULL) {
 118                 parser->state = ERTF_EOF;
 119                 return ERTF_EOF;
 120         }
 121
 122         if (conv_convert(parser->conv, buf2, sizeof(buf2), buf) < 0) {
 123                 g_warning("ertf_read_line(): code conversion failed\n");
 124
 125                 index = parser->bufp - parser->buf->str;
 126
 127                 g_string_append(parser->buf, buf);
 128
 129                 parser->bufp = parser->buf->str + index;
 130
 131                 return ERTF_ERR;
 132         }
 133
 134         index = parser->bufp - parser->buf->str;
 135
 136         g_string_append(parser->buf, buf2);
 137
 138         parser->bufp = parser->buf->str + index;
 139
 140         return ERTF_NORMAL;
 141 }
 142
 143 static void ertf_append_char(ERTFParser *parser, gchar ch)
 144 {
 145         GString *str = parser->str;
 146
 147         if (!parser->pre && parser->space) {
 148                 if (ch != '\n')
 149                         g_string_append_c(str, ' ');
 150                 parser->space = FALSE;
 151         }
 152
 153         g_string_append_c(str, ch);
 154
 155         parser->empty_line = FALSE;
 156         if (ch == '\n') {
 157                 if (parser->newline)
 158                         parser->empty_line = TRUE;
 159                 else
 160                         parser->newline = TRUE;
 161         } else
 162                 parser->newline = FALSE;
 163 }
 164
 165 static ERTFState ertf_parse_tag(ERTFParser *parser)
 166 {
 167         gchar buf[ERTFBUFSIZE];
 168         gchar *p;
 169
 170         ertf_get_parenthesis (parser, buf, sizeof(buf));
 171
 172         for (p = buf; *p != '\0'; p++) {
 173                 if (isspace (*(guchar *)p)) {
 174                         *p = '\0';
 175                         break;
 176                 }
 177         }
 178
 179         parser->state = ERTF_UNKNOWN;
 180         if (buf[0] == '\0') return parser->state;
 181
 182         g_strdown (buf);
 183
 184         if (!strcmp(buf, "nofill")) {
 185                 parser->pre   = TRUE;
 186                 parser->state = ERTF_NOFILL;
 187         }
 188         else if (!strcmp(buf, "/nofill")) {
 189                 parser->pre   = FALSE;
 190                 parser->state = ERTF_NORMAL;
 191         }
 192
 193         return parser->state;
 194 }
 195
 196 static void ertf_get_parenthesis(ERTFParser *parser, gchar *buf, gint len)
 197 {
 198         gchar *p;
 199
 200         buf[0] = '\0';
 201         g_return_if_fail(*parser->bufp == '<');
 202
 203         /* ignore params */
 204         if (!g_ascii_strncasecmp(parser->bufp, "<param>", 4)) {
 205                 parser->bufp += 7;
 206                 while ((p = strstr(parser->bufp, "</param>")) == NULL)
 207                         if (ertf_read_line(parser) == ERTF_EOF) return;
 208                 parser->bufp = p + 8;
 209                 return;
 210         }
 211         parser->bufp++;
 212         while ((p = strchr(parser->bufp, '>')) == NULL)
 213                 if (ertf_read_line(parser) == ERTF_EOF) return;
 214
 215         strncpy2(buf, parser->bufp, MIN(p - parser->bufp + 1, len));
 216         parser->bufp = p + 1;
 217 }
 218