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claws-mail/src/html.c
Colin Leroy ccda55996e try again
2006-11-07 10:47:23 +00:00

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/*
* Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
* Copyright (C) 1999-2006 Hiroyuki Yamamoto and the Claws Mail team
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "html.h"
#include "codeconv.h"
#include "utils.h"
#define SC_HTMLBUFSIZE 8192
#define HR_STR "------------------------------------------------"
typedef struct _SC_HTMLSymbol SC_HTMLSymbol;
struct _SC_HTMLSymbol
{
gchar *const key;
gchar *const val;
};
static SC_HTMLSymbol symbol_list[] = {
{"&lt;" , "<"},
{"&gt;" , ">"},
{"&amp;" , "&"},
{"&quot;" , "\""},
{"&lsquo;", "'"},
{"&rsquo;", "'"},
{"&ldquo;", "\""},
{"&rdquo;", "\""},
{"&nbsp;" , " "},
{"&trade;" , "(TM)"},
{"&#153;", "(TM)"},
{"&hellip;", "..."},
};
static SC_HTMLSymbol ascii_symbol_list[] = {
{"&iexcl;" , "\302\241"},
{"&brvbar;", "\302\246"},
{"&copy;" , "\302\251"},
{"&laquo;" , "\302\253"},
{"&reg;" , "\302\256"},
{"&sup2;" , "\302\262"},
{"&sup3;" , "\302\263"},
{"&acute;" , "\302\264"},
{"&cedil;" , "\302\270"},
{"&sup1;" , "\302\271"},
{"&raquo;" , "\302\273"},
{"&frac14;", "\302\274"},
{"&frac12;", "\302\275"},
{"&frac34;", "\302\276"},
{"&iquest;", "\302\277"},
{"&Agrave;", "\303\200"},
{"&Aacute;", "\303\201"},
{"&Acirc;" , "\303\202"},
{"&Atilde;", "\303\203"},
{"&AElig;" , "\303\206"},
{"&Egrave;", "\303\210"},
{"&Eacute;", "\303\211"},
{"&Ecirc;" , "\303\212"},
{"&Igrave;", "\303\214"},
{"&Iacute;", "\303\215"},
{"&Icirc;" , "\303\216"},
{"&Ntilde;", "\303\221"},
{"&Ograve;", "\303\222"},
{"&Oacute;", "\303\223"},
{"&Ocirc;" , "\303\224"},
{"&Otilde;", "\303\225"},
{"&Ugrave;", "\303\231"},
{"&Uacute;", "\303\232"},
{"&Ucirc;" , "\303\233"},
{"&Yacute;", "\303\235"},
{"&agrave;", "\303\240"},
{"&aacute;", "\303\241"},
{"&acirc;" , "\303\242"},
{"&atilde;", "\303\243"},
{"&aelig;" , "\303\246"},
{"&egrave;", "\303\250"},
{"&eacute;", "\303\251"},
{"&ecirc;" , "\303\252"},
{"&igrave;", "\303\254"},
{"&iacute;", "\303\255"},
{"&icirc;" , "\303\256"},
{"&ntilde;", "\303\261"},
{"&ograve;", "\303\262"},
{"&oacute;", "\303\263"},
{"&ocirc;" , "\303\264"},
{"&otilde;", "\303\265"},
{"&ugrave;", "\303\271"},
{"&uacute;", "\303\272"},
{"&ucirc;" , "\303\273"},
{"&yacute;", "\303\275"},
};
static GHashTable *default_symbol_table;
static SC_HTMLState sc_html_read_line (SC_HTMLParser *parser);
static void sc_html_append_char (SC_HTMLParser *parser,
gchar ch);
static void sc_html_append_str (SC_HTMLParser *parser,
const gchar *str,
gint len);
static SC_HTMLState sc_html_parse_tag (SC_HTMLParser *parser);
static void sc_html_parse_special (SC_HTMLParser *parser);
static void sc_html_get_parenthesis (SC_HTMLParser *parser,
gchar *buf,
gint len);
SC_HTMLParser *sc_html_parser_new(FILE *fp, CodeConverter *conv)
{
SC_HTMLParser *parser;
g_return_val_if_fail(fp != NULL, NULL);
g_return_val_if_fail(conv != NULL, NULL);
parser = g_new0(SC_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->state = SC_HTML_NORMAL;
parser->href = NULL;
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);
}
#undef SYMBOL_TABLE_ADD
parser->symbol_table = default_symbol_table;
return parser;
}
void sc_html_parser_destroy(SC_HTMLParser *parser)
{
g_string_free(parser->str, TRUE);
g_string_free(parser->buf, TRUE);
g_free(parser->href);
g_free(parser);
}
gchar *sc_html_parse(SC_HTMLParser *parser)
{
parser->state = SC_HTML_NORMAL;
g_string_truncate(parser->str, 0);
if (*parser->bufp == '\0') {
g_string_truncate(parser->buf, 0);
parser->bufp = parser->buf->str;
if (sc_html_read_line(parser) == SC_HTML_EOF)
return NULL;
}
while (*parser->bufp != '\0') {
switch (*parser->bufp) {
case '<': {
SC_HTMLState st;
st = sc_html_parse_tag(parser);
/* when we see an href, we need to flush the str
* buffer. Then collect all the chars until we
* see the end anchor tag
*/
if (SC_HTML_HREF_BEG == st || SC_HTML_HREF == st)
return parser->str->str;
}
break;
case '&':
sc_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:
sc_html_append_char(parser, *parser->bufp++);
}
}
return parser->str->str;
}
static SC_HTMLState sc_html_read_line(SC_HTMLParser *parser)
{
gchar buf[SC_HTMLBUFSIZE];
gchar buf2[SC_HTMLBUFSIZE];
gint index;
if (fgets(buf, sizeof(buf), parser->fp) == NULL) {
parser->state = SC_HTML_EOF;
return SC_HTML_EOF;
}
if (conv_convert(parser->conv, buf2, sizeof(buf2), buf) < 0) {
index = parser->bufp - parser->buf->str;
conv_utf8todisp(buf2, sizeof(buf2), buf);
g_string_append(parser->buf, buf2);
parser->bufp = parser->buf->str + index;
return SC_HTML_CONV_FAILED;
}
index = parser->bufp - parser->buf->str;
g_string_append(parser->buf, buf2);
parser->bufp = parser->buf->str + index;
return SC_HTML_NORMAL;
}
static void sc_html_append_char(SC_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 sc_html_append_str(SC_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 SC_HTMLTag *sc_html_get_tag(const gchar *str)
{
SC_HTMLTag *tag;
gchar *tmp;
guchar *tmpp;
g_return_val_if_fail(str != NULL, NULL);
if (*str == '\0' || *str == '!') return NULL;
Xstrdup_a(tmp, str, return NULL);
tag = g_new0(SC_HTMLTag, 1);
for (tmpp = tmp; *tmpp != '\0' && !g_ascii_isspace(*tmpp); tmpp++)
;
if (*tmpp == '\0') {
g_strdown(tmp);
tag->name = g_strdup(tmp);
return tag;
} else {
*tmpp++ = '\0';
g_strdown(tmp);
tag->name = g_strdup(tmp);
}
while (*tmpp != '\0') {
SC_HTMLAttr *attr;
gchar *attr_name;
gchar *attr_value;
gchar *p;
gchar quote;
while (g_ascii_isspace(*tmpp)) tmpp++;
attr_name = tmpp;
while (*tmpp != '\0' && !g_ascii_isspace(*tmpp) &&
*tmpp != '=')
tmpp++;
if (*tmpp != '\0' && *tmpp != '=') {
*tmpp++ = '\0';
while (g_ascii_isspace(*tmpp)) tmpp++;
}
if (*tmpp == '=') {
*tmpp++ = '\0';
while (g_ascii_isspace(*tmpp)) tmpp++;
if (*tmpp == '"' || *tmpp == '\'') {
/* name="value" */
quote = *tmpp;
tmpp++;
attr_value = tmpp;
if ((p = strchr(attr_value, quote)) == NULL) {
g_warning("sc_html_get_tag(): syntax error in tag: '%s'\n", str);
return tag;
}
tmpp = p;
*tmpp++ = '\0';
while (g_ascii_isspace(*tmpp)) tmpp++;
} else {
/* name=value */
attr_value = tmpp;
while (*tmpp != '\0' && !g_ascii_isspace(*tmpp)) tmpp++;
if (*tmpp != '\0')
*tmpp++ = '\0';
}
} else
attr_value = "";
g_strchomp(attr_name);
g_strdown(attr_name);
attr = g_new(SC_HTMLAttr, 1);
attr->name = g_strdup(attr_name);
attr->value = g_strdup(attr_value);
tag->attr = g_list_append(tag->attr, attr);
}
return tag;
}
static void sc_html_free_tag(SC_HTMLTag *tag)
{
if (!tag) return;
g_free(tag->name);
while (tag->attr != NULL) {
SC_HTMLAttr *attr = (SC_HTMLAttr *)tag->attr->data;
g_free(attr->name);
g_free(attr->value);
g_free(attr);
tag->attr = g_list_remove(tag->attr, tag->attr->data);
}
g_free(tag);
}
static SC_HTMLState sc_html_parse_tag(SC_HTMLParser *parser)
{
gchar buf[SC_HTMLBUFSIZE];
SC_HTMLTag *tag;
sc_html_get_parenthesis(parser, buf, sizeof(buf));
tag = sc_html_get_tag(buf);
parser->state = SC_HTML_UNKNOWN;
if (!tag) return SC_HTML_UNKNOWN;
if (!strcmp(tag->name, "br")) {
parser->space = FALSE;
sc_html_append_char(parser, '\n');
parser->state = SC_HTML_BR;
} else if (!strcmp(tag->name, "a")) {
GList *cur;
for (cur = tag->attr; cur != NULL; cur = cur->next) {
if (cur->data && !strcmp(((SC_HTMLAttr *)cur->data)->name, "href")) {
g_free(parser->href);
parser->href = g_strdup(((SC_HTMLAttr *)cur->data)->value);
parser->state = SC_HTML_HREF_BEG;
break;
}
}
} else if (!strcmp(tag->name, "/a")) {
parser->state = SC_HTML_HREF;
} else if (!strcmp(tag->name, "p")) {
parser->space = FALSE;
if (!parser->empty_line) {
parser->space = FALSE;
if (!parser->newline) sc_html_append_char(parser, '\n');
sc_html_append_char(parser, '\n');
}
parser->state = SC_HTML_PAR;
} else if (!strcmp(tag->name, "pre")) {
parser->pre = TRUE;
parser->state = SC_HTML_PRE;
} else if (!strcmp(tag->name, "/pre")) {
parser->pre = FALSE;
parser->state = SC_HTML_NORMAL;
} else if (!strcmp(tag->name, "hr")) {
if (!parser->newline) {
parser->space = FALSE;
sc_html_append_char(parser, '\n');
}
sc_html_append_str(parser, HR_STR "\n", -1);
parser->state = SC_HTML_HR;
} else if (!strcmp(tag->name, "div") ||
!strcmp(tag->name, "ul") ||
!strcmp(tag->name, "li") ||
!strcmp(tag->name, "table") ||
!strcmp(tag->name, "tr") ||
(tag->name[0] == 'h' && g_ascii_isdigit(tag->name[1]))) {
if (!parser->newline) {
parser->space = FALSE;
sc_html_append_char(parser, '\n');
}
parser->state = SC_HTML_NORMAL;
} else if (!strcmp(tag->name, "/table") ||
(tag->name[0] == '/' &&
tag->name[1] == 'h' &&
g_ascii_isdigit(tag->name[1]))) {
if (!parser->empty_line) {
parser->space = FALSE;
if (!parser->newline) sc_html_append_char(parser, '\n');
sc_html_append_char(parser, '\n');
}
parser->state = SC_HTML_NORMAL;
} else if (!strcmp(tag->name, "/div") ||
!strcmp(tag->name, "/ul") ||
!strcmp(tag->name, "/li")) {
if (!parser->newline) {
parser->space = FALSE;
sc_html_append_char(parser, '\n');
}
parser->state = SC_HTML_NORMAL;
}
sc_html_free_tag(tag);
return parser->state;
}
static void sc_html_parse_special(SC_HTMLParser *parser)
{
gchar symbol_name[9];
gint n;
const gchar *val;
parser->state = SC_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 `&' */
sc_html_append_char(parser, *parser->bufp++);
parser->state = SC_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) {
sc_html_append_str(parser, val, -1);
parser->state = SC_HTML_NORMAL;
return;
} else if (symbol_name[1] == '#' && g_ascii_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)) {
sc_html_append_char(parser, ch);
parser->state = SC_HTML_NORMAL;
return;
} else {
char *symb = NULL;
switch (ch) {
/* http://www.w3schools.com/html/html_entitiesref.asp */
case 96: /* backtick */
symb = "`";
break;
case 338: /* capital ligature OE &OElig; */
symb = "OE";
break;
case 339: /* small ligature OE &oelig; */
symb = "oe";
break;
case 352: /* capital S w/caron &Scaron; */
case 353: /* small S w/caron &scaron; */
case 376: /* cap Y w/ diaeres &Yuml; */
break;
case 710: /* circumflex accent &circ; */
symb = "^";
break;
case 732: /* small tilde &tilde; */
symb = "~";
break;
case 8194: /* en space &ensp; */
case 8195: /* em space &emsp; */
case 8201: /* thin space &thinsp; */
symb = " ";
break;
case 8204: /* zero width non-joiner &zwnj; */
case 8205: /* zero width joiner &zwj; */
case 8206: /* l-t-r mark &lrm; */
case 8207: /* r-t-l mark &rlm */
break;
case 8211: /* en dash &ndash; */
symb = "-";
break;
case 8212: /* em dash &mdash; */
symb = "--";
break;
case 8216: /* l single quot mark &lsquo; */
case 8217: /* r single quot mark &rsquo; */
symb = "'";
break;
case 8218: /* single low-9 quot &sbquo; */
symb = ",";
break;
case 8220: /* l double quot mark &ldquo; */
case 8221: /* r double quot mark &rdquo; */
symb = "\"";
break;
case 8222: /* double low-9 quot &bdquo; */
symb = ",,";
break;
case 8224: /* dagger &dagger; */
case 8225: /* double dagger &Dagger; */
break;
case 8230: /* horizontal ellipsis &hellip; */
symb = "...";
break;
case 8240: /* per mile &permil; */
symb = "\%o";
break;
case 8249: /* l-pointing angle quot &lsaquo; */
symb = "<";
break;
case 8250: /* r-pointing angle quot &rsaquo; */
symb = ">";
break;
case 8364: /* euro &euro; */
symb = "EUR";
break;
case 8482: /* trademark &trade; */
symb = "(TM)";
break;
default:
break;
}
if (symb) {
sc_html_append_str(parser, symb, -1);
parser->state = SC_HTML_NORMAL;
return;
}
}
}
sc_html_append_str(parser, symbol_name, -1);
}
static void sc_html_get_parenthesis(SC_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 (sc_html_read_line(parser) == SC_HTML_EOF) return;
parser->bufp = p + 3;
return;
}
if (!g_ascii_strncasecmp(parser->bufp, "<style", 6)) {
parser->bufp += 6;
while ((p = strcasestr(parser->bufp, "</style>")) == NULL)
if (sc_html_read_line(parser) == SC_HTML_EOF) return;
parser->bufp = p + 8;
return;
}
if (!g_ascii_strncasecmp(parser->bufp, "<script", 7)) {
parser->bufp += 7;
while ((p = strcasestr(parser->bufp, "</script>")) == NULL)
if (sc_html_read_line(parser) == SC_HTML_EOF) return;
parser->bufp = p + 9;
return;
}
parser->bufp++;
while ((p = strchr(parser->bufp, '>')) == NULL)
if (sc_html_read_line(parser) == SC_HTML_EOF) return;
strncpy2(buf, parser->bufp, MIN(p - parser->bufp + 1, len));
g_strstrip(buf);
parser->bufp = p + 1;
}
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