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claws-mail/src/html.c
Paul Mangan 5bb7c89c48 sync with sylpheed 0.6.5cvs20
2001-12-03 10:06:10 +00:00

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17 KiB
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/*
* Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
* Copyright (C) 1999,2000 Hiroyuki Yamamoto
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "html.h"
#include "codeconv.h"
#include "utils.h"
#define HTMLBUFSIZE 8192
#define HR_STR "------------------------------------------------"
typedef struct _HTMLSymbol HTMLSymbol;
struct _HTMLSymbol
{
gchar *const key;
gchar *const val;
};
static HTMLSymbol symbol_list[] = {
{"&lt;" , "<"},
{"&gt;" , ">"},
{"&amp;" , "&"},
{"&quot;" , "\""},
{"&nbsp;" , " "},
{"&trade;" , "(TM)"},
{"&#153;", "(TM)"},
};
static HTMLSymbol ascii_symbol_list[] = {
{"&iexcl;" , "^!"},
{"&brvbar;", "|"},
{"&copy;" , "(C)"},
{"&laquo;" , "<<"},
{"&reg;" , "(R)"},
{"&sup2;" , "^2"},
{"&sup3;" , "^3"},
{"&acute;" , "'"},
{"&cedil;" , ","},
{"&sup1;" , "^1"},
{"&raquo;" , ">>"},
{"&frac14;", "1/4"},
{"&frac12;", "1/2"},
{"&frac34;", "3/4"},
{"&iquest;", "^?"},
{"&Agrave;", "A`"},
{"&Aacute;", "A'"},
{"&Acirc;" , "A^"},
{"&Atilde;", "A~"},
{"&AElig;" , "AE"},
{"&Egrave;", "E`"},
{"&Eacute;", "E'"},
{"&Ecirc;" , "E^"},
{"&Igrave;", "I`"},
{"&Iacute;", "I'"},
{"&Icirc;" , "I^"},
{"&Ntilde;", "N~"},
{"&Ograve;", "O`"},
{"&Oacute;", "O'"},
{"&Ocirc;" , "O^"},
{"&Otilde;", "O~"},
{"&Ugrave;", "U`"},
{"&Uacute;", "U'"},
{"&Ucirc;" , "U^"},
{"&Yacute;", "Y'"},
{"&agrave;", "a`"},
{"&aacute;", "a'"},
{"&acirc;" , "a^"},
{"&atilde;", "a~"},
{"&aelig;" , "ae"},
{"&egrave;", "e`"},
{"&eacute;", "e'"},
{"&ecirc;" , "e^"},
{"&igrave;", "i`"},
{"&iacute;", "i'"},
{"&icirc;" , "i^"},
{"&ntilde;", "n~"},
{"&ograve;", "o`"},
{"&oacute;", "o'"},
{"&ocirc;" , "o^"},
{"&otilde;", "o~"},
{"&ugrave;", "u`"},
{"&uacute;", "u'"},
{"&ucirc;" , "u^"},
{"&yacute;", "y'"},
};
static HTMLSymbol eucjp_symbol_list[] = {
{"&iexcl;" , "^!"},
{"&cent;" , "\xa1\xf1"},
{"&pound;" , "\xa1\xf2"},
{"&yen;" , "\xa1\xef"},
{"&brvbar;", "|"},
{"&sect;" , "\xa1\xf8"},
{"&uml;" , "\xa1\xaf"},
{"&copy;" , "(C)"},
{"&laquo;" , "<<"},
{"&reg;" , "(R)"},
{"&deg;" , "\xa1\xeb"},
{"&plusmn;", "\xa1\xde"},
{"&sup2;" , "^2"},
{"&sup3;" , "^3"},
{"&acute;" , "'"},
{"&micro;" , "\xa6\xcc"},
{"&para;" , "\xa2\xf9"},
{"&middot;", "\xa1\xa6"},
{"&cedil;" , ","},
{"&sup1;" , "^1"},
{"&raquo;" , ">>"},
{"&frac14;", "1/4"},
{"&frac12;", "1/2"},
{"&frac34;", "3/4"},
{"&iquest;", "^?"},
{"&Agrave;", "A`"},
{"&Aacute;", "A'"},
{"&Acirc;" , "A^"},
{"&Atilde;", "A~"},
{"&Auml;" , "A\xa1\xaf"},
{"&Aring;" , "A\xa1\xeb"},
{"&AElig;" , "AE"},
{"&Egrave;", "E`"},
{"&Eacute;", "E'"},
{"&Ecirc;" , "E^"},
{"&Euml;" , "E\xa1\xaf"},
{"&Igrave;", "I`"},
{"&Iacute;", "I'"},
{"&Icirc;" , "I^"},
{"&Iuml;" , "I\xa1\xaf"},
{"&Ntilde;", "N~"},
{"&Ograve;", "O`"},
{"&Oacute;", "O'"},
{"&Ocirc;" , "O^"},
{"&Otilde;", "O~"},
{"&Ouml;" , "O\xa1\xaf"},
{"&times;" , "\xa1\xdf"},
{"&Ugrave;", "U`"},
{"&Uacute;", "U'"},
{"&Ucirc;" , "U^"},
{"&Uuml;" , "U\xa1\xaf"},
{"&Yacute;", "Y'"},
{"&agrave;", "a`"},
{"&aacute;", "a'"},
{"&acirc;" , "a^"},
{"&atilde;", "a~"},
{"&auml;" , "a\xa1\xaf"},
{"&aring;" , "a\xa1\xeb"},
{"&aelig;" , "ae"},
{"&egrave;", "e`"},
{"&eacute;", "e'"},
{"&ecirc;" , "e^"},
{"&euml;" , "e\xa1\xaf"},
{"&igrave;", "i`"},
{"&iacute;", "i'"},
{"&icirc;" , "i^"},
{"&iuml;" , "i\xa1\xaf"},
{"&eth;" , "\xa2\xdf"},
{"&ntilde;", "n~"},
{"&ograve;", "o`"},
{"&oacute;", "o'"},
{"&ocirc;" , "o^"},
{"&otilde;", "o~"},
{"&ouml;" , "o\xa1\xaf"},
{"&divide;", "\xa1\xe0"},
{"&ugrave;", "u`"},
{"&uacute;", "u'"},
{"&ucirc;" , "u^"},
{"&uuml;" , "u\xa1\xaf"},
{"&yacute;", "y'"},
{"&yuml;" , "y\xa1\xaf"},
};
static HTMLSymbol latin_symbol_list[] = {
{"&iexcl;" , "\xa1"},
{"&cent;" , "\xa2"},
{"&pound;" , "\xa3"},
{"&curren;", "\xa4"},
{"&yen;" , "\xa5"},
{"&brvbar;", "\xa6"},
{"&sect;" , "\xa7"},
{"&uml;" , "\xa8"},
{"&copy;" , "\xa9"},
{"&ordf;" , "\xaa"},
{"&laquo;" , "\xab"},
{"&not;" , "\xac"},
{"&shy;" , "\xad"},
{"&reg;" , "\xae"},
{"&macr;" , "\xaf"},
{"&deg;" , "\xb0"},
{"&plusmn;", "\xb1"},
{"&sup2;" , "\xb2"},
{"&sup3;" , "\xb3"},
{"&acute;" , "\xb4"},
{"&micro;" , "\xb5"},
{"&para;" , "\xb6"},
{"&middot;", "\xb7"},
{"&cedil;" , "\xb8"},
{"&sup1;" , "\xb9"},
{"&ordm;" , "\xba"},
{"&raquo;" , "\xbb"},
{"&frac14;", "\xbc"},
{"&frac12;", "\xbd"},
{"&frac34;", "\xbe"},
{"&iquest;", "\xbf"},
{"&Agrave;", "\xc0"},
{"&Aacute;", "\xc1"},
{"&Acirc;" , "\xc2"},
{"&Atilde;", "\xc3"},
{"&Auml;" , "\xc4"},
{"&Aring;" , "\xc5"},
{"&AElig;" , "\xc6"},
{"&Ccedil;", "\xc7"},
{"&Egrave;", "\xc8"},
{"&Eacute;", "\xc9"},
{"&Ecirc;" , "\xca"},
{"&Euml;" , "\xcb"},
{"&Igrave;", "\xcc"},
{"&Iacute;", "\xcd"},
{"&Icirc;" , "\xce"},
{"&Iuml;" , "\xcf"},
{"&ETH;" , "\xd0"},
{"&Ntilde;", "\xd1"},
{"&Ograve;", "\xd2"},
{"&Oacute;", "\xd3"},
{"&Ocirc;" , "\xd4"},
{"&Otilde;", "\xd5"},
{"&Ouml;" , "\xd6"},
{"&times;" , "\xd7"},
{"&Oslash;", "\xd8"},
{"&Ugrave;", "\xd9"},
{"&Uacute;", "\xda"},
{"&Ucirc;" , "\xdb"},
{"&Uuml;" , "\xdc"},
{"&Yacute;", "\xdd"},
{"&THORN;" , "\xde"},
{"&szlig;" , "\xdf"},
{"&agrave;", "\xe0"},
{"&aacute;", "\xe1"},
{"&acirc;" , "\xe2"},
{"&atilde;", "\xe3"},
{"&auml;" , "\xe4"},
{"&aring;" , "\xe5"},
{"&aelig;" , "\xe6"},
{"&ccedil;", "\xe7"},
{"&egrave;", "\xe8"},
{"&eacute;", "\xe9"},
{"&ecirc;" , "\xea"},
{"&euml;" , "\xeb"},
{"&igrave;", "\xec"},
{"&iacute;", "\xed"},
{"&icirc;" , "\xee"},
{"&iuml;" , "\xef"},
{"&eth;" , "\xf0"},
{"&ntilde;", "\xf1"},
{"&ograve;", "\xf2"},
{"&oacute;", "\xf3"},
{"&ocirc;" , "\xf4"},
{"&otilde;", "\xf5"},
{"&ouml;" , "\xf6"},
{"&divide;", "\xf7"},
{"&oslash;", "\xf8"},
{"&ugrave;", "\xf9"},
{"&uacute;", "\xfa"},
{"&ucirc;" , "\xfb"},
{"&uuml;" , "\xfc"},
{"&yacute;", "\xfd"},
{"&thorn;" , "\xfe"},
{"&yuml;" , "\xff"},
};
static GHashTable *default_symbol_table;
static GHashTable *eucjp_symbol_table;
static GHashTable *latin_symbol_table;
static HTMLState html_read_line (HTMLParser *parser);
static void html_append_char (HTMLParser *parser,
gchar ch);
static void html_append_str (HTMLParser *parser,
const gchar *str,
gint len);
static HTMLState html_parse_tag (HTMLParser *parser);
static void html_parse_special (HTMLParser *parser);
static void html_get_parenthesis (HTMLParser *parser,
gchar *buf,
gint len);
#if 0
static gint g_str_case_equal (gconstpointer v,
gconstpointer v2);
static guint g_str_case_hash (gconstpointer key);
#endif
HTMLParser *html_parser_new(FILE *fp, CodeConverter *conv)
{
HTMLParser *parser;
g_return_val_if_fail(fp != NULL, NULL);
g_return_val_if_fail(conv != NULL, NULL);
parser = g_new0(HTMLParser, 1);
parser->fp = fp;
parser->conv = conv;
parser->str = g_string_new(NULL);
parser->buf = g_string_new(NULL);
parser->bufp = parser->buf->str;
parser->newline = TRUE;
parser->empty_line = TRUE;
parser->space = FALSE;
parser->pre = FALSE;
#define SYMBOL_TABLE_ADD(table, list) \
{ \
gint i; \
\
for (i = 0; i < sizeof(list) / sizeof(list[0]); i++) \
g_hash_table_insert(table, list[i].key, list[i].val); \
}
if (!default_symbol_table) {
default_symbol_table =
g_hash_table_new(g_str_hash, g_str_equal);
SYMBOL_TABLE_ADD(default_symbol_table, symbol_list);
SYMBOL_TABLE_ADD(default_symbol_table, ascii_symbol_list);
}
if (!eucjp_symbol_table) {
eucjp_symbol_table =
g_hash_table_new(g_str_hash, g_str_equal);
SYMBOL_TABLE_ADD(eucjp_symbol_table, symbol_list);
SYMBOL_TABLE_ADD(eucjp_symbol_table, eucjp_symbol_list);
}
if (!latin_symbol_table) {
latin_symbol_table =
g_hash_table_new(g_str_hash, g_str_equal);
SYMBOL_TABLE_ADD(latin_symbol_table, symbol_list);
SYMBOL_TABLE_ADD(latin_symbol_table, latin_symbol_list);
}
#undef SYMBOL_TABLE_ADD
if (conv->charset == C_ISO_8859_1)
parser->symbol_table = latin_symbol_table;
else if ((conv->charset == C_ISO_2022_JP ||
conv->charset == C_ISO_2022_JP_2 ||
conv->charset == C_EUC_JP ||
conv->charset == C_SHIFT_JIS) &&
conv_get_current_charset() == C_EUC_JP)
parser->symbol_table = eucjp_symbol_table;
else
parser->symbol_table = default_symbol_table;
return parser;
}
void html_parser_destroy(HTMLParser *parser)
{
g_string_free(parser->str, TRUE);
g_string_free(parser->buf, TRUE);
g_free(parser);
}
gchar *html_parse(HTMLParser *parser)
{
parser->state = HTML_NORMAL;
g_string_truncate(parser->str, 0);
if (*parser->bufp == '\0') {
g_string_truncate(parser->buf, 0);
parser->bufp = parser->buf->str;
if (html_read_line(parser) == HTML_EOF)
return NULL;
}
while (*parser->bufp != '\0') {
switch (*parser->bufp) {
case '<':
if (parser->str->len == 0)
html_parse_tag(parser);
else
return parser->str->str;
break;
case '&':
html_parse_special(parser);
break;
case ' ':
case '\t':
case '\r':
case '\n':
if (parser->bufp[0] == '\r' && parser->bufp[1] == '\n')
parser->bufp++;
if (!parser->pre) {
if (!parser->newline)
parser->space = TRUE;
parser->bufp++;
break;
}
/* fallthrough */
default:
html_append_char(parser, *parser->bufp++);
}
}
return parser->str->str;
}
static HTMLState html_read_line(HTMLParser *parser)
{
gchar buf[HTMLBUFSIZE];
gchar buf2[HTMLBUFSIZE];
gint index;
if (fgets(buf, sizeof(buf), parser->fp) == NULL) {
parser->state = HTML_EOF;
return HTML_EOF;
}
if (conv_convert(parser->conv, buf2, sizeof(buf2), buf) < 0) {
g_warning("html_read_line(): code conversion failed\n");
index = parser->bufp - parser->buf->str;
g_string_append(parser->buf, buf);
parser->bufp = parser->buf->str + index;
return HTML_ERR;
}
index = parser->bufp - parser->buf->str;
g_string_append(parser->buf, buf2);
parser->bufp = parser->buf->str + index;
return HTML_NORMAL;
}
static void html_append_char(HTMLParser *parser, gchar ch)
{
GString *str = parser->str;
if (!parser->pre && parser->space) {
g_string_append_c(str, ' ');
parser->space = FALSE;
}
g_string_append_c(str, ch);
parser->empty_line = FALSE;
if (ch == '\n') {
parser->newline = TRUE;
if (str->len > 1 && str->str[str->len - 2] == '\n')
parser->empty_line = TRUE;
} else
parser->newline = FALSE;
}
static void html_append_str(HTMLParser *parser, const gchar *str, gint len)
{
GString *string = parser->str;
if (!parser->pre && parser->space) {
g_string_append_c(string, ' ');
parser->space = FALSE;
}
if (len == 0) return;
if (len < 0)
g_string_append(string, str);
else {
gchar *s;
Xstrndup_a(s, str, len, return);
g_string_append(string, s);
}
parser->empty_line = FALSE;
if (string->len > 0 && string->str[string->len - 1] == '\n') {
parser->newline = TRUE;
if (string->len > 1 && string->str[string->len - 2] == '\n')
parser->empty_line = TRUE;
} else
parser->newline = FALSE;
}
static HTMLState html_parse_tag(HTMLParser *parser)
{
gchar buf[HTMLBUFSIZE];
gchar *p;
static gboolean is_in_href = FALSE;
html_get_parenthesis(parser, buf, sizeof(buf));
for (p = buf; *p != '\0'; p++) {
if (isspace(*p)) {
*p = '\0';
break;
}
}
parser->state = HTML_UNKNOWN;
if (buf[0] == '\0') return parser->state;
g_strdown(buf);
if (!strcmp(buf, "br")) {
parser->space = FALSE;
html_append_char(parser, '\n');
parser->state = HTML_BR;
} else if (!strcmp(buf, "a")) {
/* look for tokens separated by space or = */
char* href_token = strtok(++p, " =");
parser->state = HTML_NORMAL;
while (href_token != NULL) {
/* look for href */
if (!strcmp(href_token, "href")) {
/* the next token is the url, between double
* quotes */
char* url = strtok(NULL, "\"");
html_append_str(parser, url, strlen(url));
html_append_char(parser, ' ');
/* start enforcing html link */
parser->state = HTML_HREF;
is_in_href = TRUE;
break;
}
/* or get next token */
href_token = strtok(NULL, " =");
}
} else if (!strcmp(buf, "/a")) {
/* stop enforcing html link */
parser->state = HTML_NORMAL;
is_in_href = FALSE;
} else if (!strcmp(buf, "p")) {
parser->space = FALSE;
if (!parser->empty_line) {
parser->space = FALSE;
if (!parser->newline) html_append_char(parser, '\n');
html_append_char(parser, '\n');
}
parser->state = HTML_PAR;
} else if (!strcmp(buf, "pre")) {
parser->pre = TRUE;
parser->state = HTML_PRE;
} else if (!strcmp(buf, "/pre")) {
parser->pre = FALSE;
parser->state = HTML_NORMAL;
} else if (!strcmp(buf, "hr")) {
if (!parser->newline) {
parser->space = FALSE;
html_append_char(parser, '\n');
}
html_append_str(parser, HR_STR "\n", -1);
parser->state = HTML_HR;
} else if (!strcmp(buf, "div") ||
!strcmp(buf, "ul") ||
!strcmp(buf, "li") ||
!strcmp(buf, "table") ||
!strcmp(buf, "tr") ||
(buf[0] == 'h' && isdigit(buf[1]))) {
if (!parser->newline) {
parser->space = FALSE;
html_append_char(parser, '\n');
}
parser->state = HTML_NORMAL;
} else if (!strcmp(buf, "/table") ||
(buf[0] == '/' && buf[1] == 'h' && isdigit(buf[1]))) {
if (!parser->empty_line) {
parser->space = FALSE;
if (!parser->newline) html_append_char(parser, '\n');
html_append_char(parser, '\n');
}
parser->state = HTML_NORMAL;
} else if (!strcmp(buf, "/div") ||
!strcmp(buf, "/ul") ||
!strcmp(buf, "/li")) {
if (!parser->newline) {
parser->space = FALSE;
html_append_char(parser, '\n');
}
parser->state = HTML_NORMAL;
}
if (is_in_href == TRUE) {
/* when inside a link, everything will be written as
* clickable (see textview_show_thml in textview.c) */
parser->state = HTML_HREF;
}
return parser->state;
}
static void html_parse_special(HTMLParser *parser)
{
gchar symbol_name[9];
gint n;
const gchar *val;
parser->state = HTML_UNKNOWN;
g_return_if_fail(*parser->bufp == '&');
/* &foo; */
for (n = 0; parser->bufp[n] != '\0' && parser->bufp[n] != ';'; n++)
;
if (n > 7 || parser->bufp[n] != ';') {
/* output literal `&' */
html_append_char(parser, *parser->bufp++);
parser->state = HTML_NORMAL;
return;
}
strncpy2(symbol_name, parser->bufp, n + 2);
parser->bufp += n + 1;
if ((val = g_hash_table_lookup(parser->symbol_table, symbol_name))
!= NULL) {
html_append_str(parser, val, -1);
parser->state = HTML_NORMAL;
return;
} else if (symbol_name[1] == '#' && isdigit(symbol_name[2])) {
gint ch;
ch = atoi(symbol_name + 2);
if ((ch > 0 && ch <= 127) ||
(ch >= 128 && ch <= 255 &&
parser->conv->charset == C_ISO_8859_1)) {
html_append_char(parser, ch);
parser->state = HTML_NORMAL;
return;
}
}
html_append_str(parser, symbol_name, -1);
}
static void html_get_parenthesis(HTMLParser *parser, gchar *buf, gint len)
{
gchar *p;
buf[0] = '\0';
g_return_if_fail(*parser->bufp == '<');
/* ignore comment / CSS / script stuff */
if (!strncmp(parser->bufp, "<!--", 4)) {
parser->bufp += 4;
while ((p = strstr(parser->bufp, "-->")) == NULL)
if (html_read_line(parser) == HTML_EOF) return;
parser->bufp = p + 3;
return;
}
if (!g_strncasecmp(parser->bufp, "<style", 6)) {
parser->bufp += 6;
while ((p = strcasestr(parser->bufp, "</style>")) == NULL)
if (html_read_line(parser) == HTML_EOF) return;
parser->bufp = p + 8;
return;
}
if (!g_strncasecmp(parser->bufp, "<script", 7)) {
parser->bufp += 7;
while ((p = strcasestr(parser->bufp, "</script>")) == NULL)
if (html_read_line(parser) == HTML_EOF) return;
parser->bufp = p + 9;
return;
}
parser->bufp++;
while ((p = strchr(parser->bufp, '>')) == NULL)
if (html_read_line(parser) == HTML_EOF) return;
strncpy2(buf, parser->bufp, MIN(p - parser->bufp + 1, len));
parser->bufp = p + 1;
}
/* these hash functions were taken from gstring.c in glib */
#if 0
static gint g_str_case_equal(gconstpointer v, gconstpointer v2)
{
return strcasecmp((const gchar *)v, (const gchar *)v2) == 0;
}
static guint g_str_case_hash(gconstpointer key)
{
const gchar *p = key;
guint h = *p;
if (h) {
h = tolower(h);
for (p += 1; *p != '\0'; p++)
h = (h << 5) - h + tolower(*p);
}
return h;
}
#endif
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