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/*
* This file is part of Xfce (https://gitlab.xfce.org).
*
* Copyright (c) 2021 Jan Ziak <0xe2.0x9a.0x9b@xfce.org>
* Copyright (c) 2023 Błażej Szczygieł
*
* 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 Library 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.
*/
#pragma once
#include <glib.h>
#include <string>
#include <string_view>
#include <vector>
#include <memory>
#include <optional>
#include <limits>
namespace xfce4 {
using namespace std;
/*
* A string_view which takes ownership of "gchar *" data and frees it if "g_string_view" is destroyed.
*
* Warning: if you obtain a "string_view" from a "g_string_view", never use it after "g_string_view"
* being destroyed!
*/
class g_string_view : public string_view
{
public:
g_string_view () = default;
g_string_view (gchar *data, gsize length)
: string_view (data, length)
, m_data(shared_ptr<gchar>(data, [](gchar *ptr) { g_free (ptr); }))
{}
g_string_view (gchar *data)
: g_string_view (data, g_utf8_strlen (data, numeric_limits<gssize>::max ()))
{}
private:
shared_ptr<gchar> m_data;
};
static inline bool
starts_with (string_view s, string_view prefix)
{
return s.size () >= prefix.size () && equal (prefix.begin(), prefix.end(), s.begin());
}
static inline bool
ends_with (string_view s, string_view suffix)
{
return s.size () >= suffix.size () && equal (s.begin () + (s.size () - suffix.size ()), s.end (), suffix.begin ());
}
template<typename StringList> static inline string
join (const StringList &strings, string_view separator)
{
size_t size = separator.size () * strings.size () - 1;
for (auto &&str : strings)
{
size += str.size ();
}
string s;
s.reserve (size);
for (auto &&str : strings)
{
if (&str != &strings[0])
{
s.append (separator);
}
s.append (str);
}
return s;
}
static inline string
sprintf (const char *fmt, ...)
{
string buf;
va_list ap;
va_start (ap, fmt);
gint n = g_vsnprintf (nullptr, 0, fmt, ap);
va_end (ap);
if (n > 0 && n < numeric_limits<gint>::max ())
{
buf.resize (n + 1);
va_start (ap, fmt);
g_vsnprintf (buf.data (), buf.size (), fmt, ap);
va_end (ap);
}
return buf;
}
static inline string_view
trim_left (string_view s)
{
auto index = s.find_first_not_of (" \n\r\t");
return index == string_view::npos ? string_view() : s.substr (index);
}
static inline string_view
trim_right (string_view s)
{
auto index = s.find_last_not_of (" \n\r\t");
return index == string_view::npos ? s : s.substr (0, index + 1);
}
static inline string_view
trim (string_view s)
{
return trim_left (trim_right (s));
}
/*
* Number parsing functions. If parsing fails, an optional without a value is returned.
*
* The string_view can contain just the number, with an optional prefix and suffix consisting from whitespace characters.
*/
template<typename T>
static optional<T> parse_number (string_view s, guint base)
{
static_assert (is_same_v<T, gint64> || is_same_v<T, guint64> || is_same_v<T, gdouble>);
if (const auto s1 = trim (s); !s1.empty ())
{
const auto s2 = s1.data ();
gchar *end = nullptr;
errno = 0;
T value;
if constexpr (is_same_v<T, gint64>)
value = g_ascii_strtoll (s2, &end, base);
else if constexpr (is_same_v<T, guint64>)
value = g_ascii_strtoull (s2, &end, base);
else if constexpr (is_same_v<T, gdouble>)
value = g_ascii_strtod (s2, &end);
if (errno == 0 && end == s2 + s1.size ())
return value;
}
return nullopt;
}
static inline optional<gdouble>
parse_double (string_view s)
{
return parse_number<gdouble> (s, 0);
}
static inline optional<guint64>
parse_ulong (string_view s, guint base = 0)
{
return parse_number<guint64> (s, base);
}
static inline optional<gint64>
parse_long (string_view s, guint base = 0)
{
return parse_number<gint64> (s, base);
}
} /* namespace xfce4 */
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