aboutsummaryrefslogtreecommitdiff
path: root/libsylph/html.c
diff options
context:
space:
mode:
Diffstat (limited to 'libsylph/html.c')
-rw-r--r--libsylph/html.c566
1 files changed, 566 insertions, 0 deletions
diff --git a/libsylph/html.c b/libsylph/html.c
new file mode 100644
index 00000000..7ba2acd3
--- /dev/null
+++ b/libsylph/html.c
@@ -0,0 +1,566 @@
+/*
+ * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
+ * Copyright (C) 1999-2005 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 GHashTable *default_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);
+
+
+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->state = 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 html_parser_destroy(HTMLParser *parser)
+{
+ g_string_free(parser->str, TRUE);
+ g_string_free(parser->buf, TRUE);
+ g_free(parser->href);
+ g_free(parser);
+}
+
+const 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 *conv_str;
+ gint index;
+
+ if (fgets(buf, sizeof(buf), parser->fp) == NULL) {
+ parser->state = HTML_EOF;
+ return HTML_EOF;
+ }
+
+ conv_str = conv_convert(parser->conv, buf);
+ if (!conv_str) {
+ index = parser->bufp - parser->buf->str;
+
+ conv_str = conv_utf8todisp(buf, NULL);
+ g_string_append(parser->buf, conv_str);
+ g_free(conv_str);
+
+ parser->bufp = parser->buf->str + index;
+
+ return HTML_CONV_FAILED;
+ }
+
+ index = parser->bufp - parser->buf->str;
+
+ g_string_append(parser->buf, conv_str);
+ g_free(conv_str);
+
+ 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 HTMLTag *html_get_tag(const gchar *str)
+{
+ 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(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') {
+ 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("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(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 html_free_tag(HTMLTag *tag)
+{
+ if (!tag) return;
+
+ g_free(tag->name);
+ while (tag->attr != NULL) {
+ HTMLAttr *attr = (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 HTMLState html_parse_tag(HTMLParser *parser)
+{
+ gchar buf[HTMLBUFSIZE];
+ HTMLTag *tag;
+
+ html_get_parenthesis(parser, buf, sizeof(buf));
+
+ tag = html_get_tag(buf);
+
+ parser->state = HTML_UNKNOWN;
+ if (!tag) return HTML_UNKNOWN;
+
+ if (!strcmp(tag->name, "br")) {
+ parser->space = FALSE;
+ html_append_char(parser, '\n');
+ parser->state = HTML_BR;
+ } else if (!strcmp(tag->name, "a")) {
+ if (tag->attr && tag->attr->data &&
+ !strcmp(((HTMLAttr *)tag->attr->data)->name, "href")) {
+ g_free(parser->href);
+ parser->href =
+ g_strdup(((HTMLAttr *)tag->attr->data)->value);
+ parser->state = HTML_HREF;
+ }
+ } else if (!strcmp(tag->name, "/a")) {
+ g_free(parser->href);
+ parser->href = NULL;
+ parser->state = HTML_NORMAL;
+ } else if (!strcmp(tag->name, "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(tag->name, "pre")) {
+ parser->pre = TRUE;
+ parser->state = HTML_PRE;
+ } else if (!strcmp(tag->name, "/pre")) {
+ parser->pre = FALSE;
+ parser->state = HTML_NORMAL;
+ } else if (!strcmp(tag->name, "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(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;
+ html_append_char(parser, '\n');
+ }
+ parser->state = 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) html_append_char(parser, '\n');
+ html_append_char(parser, '\n');
+ }
+ parser->state = HTML_NORMAL;
+ } else if (!strcmp(tag->name, "/div") ||
+ !strcmp(tag->name, "/ul") ||
+ !strcmp(tag->name, "/li")) {
+ if (!parser->newline) {
+ parser->space = FALSE;
+ html_append_char(parser, '\n');
+ }
+ parser->state = HTML_NORMAL;
+ }
+
+ html_free_tag(tag);
+
+ 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] == '#' && g_ascii_isdigit(symbol_name[2])) {
+ gint ch;
+
+ /* TODO: support other entity references */
+ ch = atoi(symbol_name + 2);
+ if (g_ascii_isprint(ch)) {
+ 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_ascii_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_ascii_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));
+ g_strstrip(buf);
+ parser->bufp = p + 1;
+}