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 3 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, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include <glib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <ctype.h>
  29
  30 #include "enriched.h"
  31 #include "utils.h"
  32 #include "file-utils.h"
  33
  34 #define ERTFBUFSIZE     8192
  35
  36
  37 static ERTFState ertf_read_line         (ERTFParser     *parser);
  38 static void ertf_append_char            (ERTFParser     *parser,
  39                                          gchar           ch);
  40
  41 static ERTFState ertf_parse_tag         (ERTFParser     *parser);
  42 static void ertf_get_parenthesis        (ERTFParser     *parser,
  43                                          gchar          *buf,
  44                                          gint            len);
  45
  46 ERTFParser *ertf_parser_new(FILE *fp, CodeConverter *conv)
  47 {
  48         ERTFParser *parser;
  49
  50         cm_return_val_if_fail(fp   != NULL, NULL);
  51         cm_return_val_if_fail(conv != NULL, NULL);
  52
  53         parser             = g_new0(ERTFParser, 1);
  54         parser->fp         = fp;
  55         parser->conv       = conv;
  56         parser->str        = g_string_new(NULL);
  57         parser->buf        = g_string_new(NULL);
  58         parser->bufp       = parser->buf->str;
  59         parser->newline    = TRUE;
  60         parser->empty_line = TRUE;
  61         parser->space      = FALSE;
  62         parser->pre        = FALSE;
  63
  64         return parser;
  65 }
  66
  67 void ertf_parser_destroy(ERTFParser *parser)
  68 {
  69         g_string_free(parser->str, TRUE);
  70         g_string_free(parser->buf, TRUE);
  71         g_free(parser);
  72 }
  73
  74 gchar *ertf_parse(ERTFParser *parser)
  75 {
  76         parser->state = ERTF_NORMAL;
  77         g_string_truncate(parser->str, 0);
  78
  79         if (*parser->bufp == '\0') {
  80                 g_string_truncate(parser->buf, 0);
  81                 parser->bufp = parser->buf->str;
  82                 if (ertf_read_line(parser) == ERTF_EOF)
  83                         return NULL;
  84         }
  85
  86         while (*parser->bufp != '\0') {
  87                 switch (*parser->bufp) {
  88                         case '<':
  89                                 if (parser->str->len == 0)
  90                                         ertf_parse_tag(parser);
  91                                 else
  92                                         return parser->str->str;
  93                                 break;
  94                         case '\n':
  95                         case '\r':
  96                                 if (parser->bufp[0] == '\r' && parser->bufp[1] == '\n')
  97                                                 parser->bufp++;
  98
  99                                 if (!parser->pre) {
 100                                         /* When not pre (not <nofill>), 1 CRLF = SPACE, N>1 CRLF = N-1 CRLF*/
 101                                         if (!parser->newline) {
 102                                                 parser->newline = TRUE;
 103                                                 parser->space = TRUE;
 104                                         parser->bufp++;
 105                                         break;
 106                                         }
 107
 108                                 }
 109                         default:
 110                                 ertf_append_char(parser, *parser->bufp++);
 111                 }
 112         }
 113
 114         return parser->str->str;
 115 }
 116
 117 static ERTFState ertf_read_line(ERTFParser *parser)
 118 {
 119         gchar buf[ERTFBUFSIZE];
 120         gchar buf2[ERTFBUFSIZE];
 121         gint index;
 122
 123         if (claws_fgets(buf, sizeof(buf), parser->fp) == NULL) {
 124                 parser->state = ERTF_EOF;
 125                 return ERTF_EOF;
 126         }
 127
 128         if (conv_convert(parser->conv, buf2, sizeof(buf2), buf) < 0) {
 129                 g_warning("ertf_read_line(): code conversion failed");
 130
 131                 index = parser->bufp - parser->buf->str;
 132
 133                 g_string_append(parser->buf, buf);
 134
 135                 parser->bufp = parser->buf->str + index;
 136
 137                 return ERTF_ERR;
 138         }
 139
 140         index = parser->bufp - parser->buf->str;
 141
 142         g_string_append(parser->buf, buf2);
 143
 144         parser->bufp = parser->buf->str + index;
 145
 146         return ERTF_NORMAL;
 147 }
 148
 149 static void ertf_append_char(ERTFParser *parser, gchar ch)
 150 {
 151         GString *str = parser->str;
 152
 153         if (!parser->pre && parser->space) {
 154                 if (ch != '\n')
 155                         g_string_append_c(str, ' ');
 156                 parser->space = FALSE;
 157         }
 158
 159         g_string_append_c(str, ch);
 160
 161         parser->empty_line = FALSE;
 162         if (ch == '\n') {
 163                 if (parser->newline)
 164                         parser->empty_line = TRUE;
 165                 else
 166                         parser->newline = TRUE;
 167         } else
 168                 parser->newline = FALSE;
 169 }
 170
 171 static ERTFState ertf_parse_tag(ERTFParser *parser)
 172 {
 173         gchar buf[ERTFBUFSIZE];
 174         gchar *p;
 175         gchar *down;
 176
 177         ertf_get_parenthesis (parser, buf, sizeof(buf));
 178
 179         for (p = buf; *p != '\0'; p++) {
 180                 if (isspace (*(guchar *)p)) {
 181                         *p = '\0';
 182                         break;
 183                 }
 184         }
 185
 186         parser->state = ERTF_UNKNOWN;
 187         if (buf[0] == '\0') return parser->state;
 188
 189         down = g_utf8_strdown (buf, -1);
 190
 191         if (!strcmp(down, "nofill")) {
 192                 parser->pre   = TRUE;
 193                 parser->state = ERTF_NOFILL;
 194         }
 195         else if (!strcmp(down, "/nofill")) {
 196                 parser->pre   = FALSE;
 197                 parser->state = ERTF_NORMAL;
 198         }
 199         g_free(down);
 200         return parser->state;
 201 }
 202
 203 static void ertf_get_parenthesis(ERTFParser *parser, gchar *buf, gint len)
 204 {
 205         gchar *p;
 206
 207         buf[0] = '\0';
 208         cm_return_if_fail(*parser->bufp == '<');
 209
 210         /* ignore params */
 211         if (!g_ascii_strncasecmp(parser->bufp, "<param>", 4)) {
 212                 parser->bufp += 7;
 213                 while ((p = strstr(parser->bufp, "</param>")) == NULL)
 214                         if (ertf_read_line(parser) == ERTF_EOF) return;
 215                 parser->bufp = p + 8;
 216                 return;
 217         }
 218         parser->bufp++;
 219         while ((p = strchr(parser->bufp, '>')) == NULL)
 220                 if (ertf_read_line(parser) == ERTF_EOF) return;
 221
 222         strncpy2(buf, parser->bufp, MIN(p - parser->bufp + 1, len));
 223         parser->bufp = p + 1;
 224 }
 225