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/*
* Copyright (C) 2010 Collabora Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Xavier Claessens <xclaesse@gmail.com>
*/
#include "config.h"
#include "tpaw-string-parser.h"
#include <string.h>
#include "tpaw-utils.h"
#define SCHEMES "([a-zA-Z\\+]+)"
#define INVALID_CHARS "\\s\"<>"
#define INVALID_CHARS_EXT INVALID_CHARS "\\[\\](){},;:"
#define INVALID_CHARS_FULL INVALID_CHARS_EXT "?'"
#define BODY "([^"INVALID_CHARS_FULL"])([^"INVALID_CHARS_EXT"]*)"
#define BODY_END "([^"INVALID_CHARS"]*)[^"INVALID_CHARS_FULL".]"
#define URI_REGEX "("SCHEMES"://"BODY_END")" \
"|((www|ftp)\\."BODY_END")" \
"|((mailto:)?"BODY"@"BODY"\\."BODY_END")"
static GRegex *
uri_regex_dup_singleton (void)
{
static GRegex *uri_regex = NULL;
/* We intentionally leak the regex so it's not recomputed */
if (!uri_regex)
{
GError *error = NULL;
uri_regex = g_regex_new (URI_REGEX, 0, 0, &error);
if (uri_regex == NULL)
{
g_warning ("Failed to create reg exp: %s", error->message);
g_error_free (error);
return NULL;
}
}
return g_regex_ref (uri_regex);
}
void
tpaw_string_parser_substr (const gchar *text,
gssize len,
TpawStringParser *parsers,
gpointer user_data)
{
if (parsers != NULL && parsers[0].match_func != NULL)
{
parsers[0].match_func (text, len,
parsers[0].replace_func, parsers + 1,
user_data);
}
}
void
tpaw_string_match_link (const gchar *text,
gssize len,
TpawStringReplace replace_func,
TpawStringParser *sub_parsers,
gpointer user_data)
{
GRegex *uri_regex;
GMatchInfo *match_info;
gboolean match;
gint last = 0;
uri_regex = uri_regex_dup_singleton ();
if (uri_regex == NULL)
{
tpaw_string_parser_substr (text, len, sub_parsers, user_data);
return;
}
match = g_regex_match_full (uri_regex, text, len, 0, 0, &match_info, NULL);
if (match)
{
gint s = 0, e = 0;
do
{
g_match_info_fetch_pos (match_info, 0, &s, &e);
if (s > last)
{
/* Append the text between last link (or the
* start of the message) and this link */
tpaw_string_parser_substr (text + last,
s - last,
sub_parsers,
user_data);
}
replace_func (text + s, e - s, NULL, user_data);
last = e;
} while (g_match_info_next (match_info, NULL));
}
tpaw_string_parser_substr (text + last, len - last, sub_parsers, user_data);
g_match_info_free (match_info);
g_regex_unref (uri_regex);
}
void
tpaw_string_match_all (const gchar *text,
gssize len,
TpawStringReplace replace_func,
TpawStringParser *sub_parsers,
gpointer user_data)
{
replace_func (text, len, NULL, user_data);
}
void
tpaw_string_replace_link (const gchar *text,
gssize len,
gpointer match_data,
gpointer user_data)
{
GString *string = user_data;
gchar *real_url;
gchar *title;
gchar *markup;
real_url = tpaw_make_absolute_url_len (text, len);
/* Need to copy manually, because g_markup_printf_escaped does not work
* with string precision pitfalls. */
title = g_strndup (text, len);
/* Append the link inside <a href=""></a> tag */
markup = g_markup_printf_escaped ("<a href=\"%s\">%s</a>", real_url, title);
g_string_append (string, markup);
g_free (real_url);
g_free (title);
g_free (markup);
}
void
tpaw_string_replace_escaped (const gchar *text,
gssize len,
gpointer match_data,
gpointer user_data)
{
GString *string = user_data;
gchar *escaped;
guint i;
gsize escaped_len, old_len;
escaped = g_markup_escape_text (text, len);
escaped_len = strlen (escaped);
/* Allocate more space to string (we really need a g_string_extend...) */
old_len = string->len;
g_string_set_size (string, old_len + escaped_len);
g_string_truncate (string, old_len);
/* Remove '\r' */
for (i = 0; i < escaped_len; i++)
{
if (escaped[i] != '\r')
g_string_append_c (string, escaped[i]);
}
g_free (escaped);
}
gchar *
tpaw_add_link_markup (const gchar *text)
{
TpawStringParser parsers[] = {
{tpaw_string_match_link, tpaw_string_replace_link},
{tpaw_string_match_all, tpaw_string_replace_escaped},
{NULL, NULL}};
GString *string;
g_return_val_if_fail (text != NULL, NULL);
string = g_string_sized_new (strlen (text));
tpaw_string_parser_substr (text, -1, parsers, string);
return g_string_free (string, FALSE);
}
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