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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_STRING_ENCODE_H_
#define RTC_BASE_STRING_ENCODE_H_
#include <stddef.h>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/string_to_number.h"
#include "rtc_base/strings/string_format.h" // IWYU pragma: keep
namespace webrtc {
inline std::string BoolToString(bool b) {
return b ? "true" : "false";
}
std::string hex_encode(absl::string_view str);
std::string hex_encode_with_delimiter(absl::string_view source, char delimiter);
// hex_decode converts ascii hex to binary.
size_t hex_decode(ArrayView<char> buffer, absl::string_view source);
// hex_decode, assuming that there is a delimiter between every byte
// pair.
// `delimiter` == 0 means no delimiter
// If the buffer is too short or the data is invalid, we return 0.
size_t hex_decode_with_delimiter(ArrayView<char> buffer,
absl::string_view source,
char delimiter);
// Splits the source string into multiple fields separated by delimiter,
// with duplicates of delimiter creating empty fields. Empty input produces a
// single, empty, field.
std::vector<absl::string_view> split(absl::string_view source, char delimiter);
// Splits the source string into multiple fields separated by delimiter,
// with duplicates of delimiter ignored. Trailing delimiter ignored.
size_t tokenize(absl::string_view source,
char delimiter,
std::vector<std::string>* fields);
// Extract the first token from source as separated by delimiter, with
// duplicates of delimiter ignored. Return false if the delimiter could not be
// found, otherwise return true.
bool tokenize_first(absl::string_view source,
char delimiter,
std::string* token,
std::string* rest);
// Versions that behave differently from StrCat
// Versions not supported by StrCat:
template <typename T,
typename std::enable_if<std::is_arithmetic<T>::value &&
!std::is_same<T, bool>::value,
int>::type = 0>
static bool FromString(absl::string_view s, T* t) {
RTC_DCHECK(t);
std::optional<T> result = StringToNumber<T>(s);
if (result)
*t = *result;
return result.has_value();
}
bool FromString(absl::string_view s, bool* b);
template <typename T>
static inline T FromString(absl::string_view str) {
T val;
FromString(str, &val);
return val;
}
//////////////////////////////////////////////////////////////////////
} // namespace webrtc
// Re-export symbols from the webrtc namespace for backwards compatibility.
// TODO(bugs.webrtc.org/4222596): Remove once all references are updated.
#ifdef WEBRTC_ALLOW_DEPRECATED_NAMESPACES
namespace rtc {
using ::webrtc::FromString;
using ::webrtc::hex_decode;
using ::webrtc::hex_decode_with_delimiter;
using ::webrtc::hex_encode;
using ::webrtc::hex_encode_with_delimiter;
using ::webrtc::split;
using ::webrtc::tokenize;
using ::webrtc::tokenize_first;
namespace internal {
template <typename T, typename = void>
struct is_absl_strcat_callable : std::false_type {};
template <typename T>
struct is_absl_strcat_callable<
T,
std::void_t<decltype(absl::StrCat(std::declval<T>()))>> : std::true_type {};
} // namespace internal
template <typename T>
ABSL_DEPRECATE_AND_INLINE()
inline auto ToString(T value) ->
typename std::enable_if<!std::is_same_v<T, bool> &&
internal::is_absl_strcat_callable<T>::value,
std::string>::type {
return absl::StrCat(value);
}
template <typename T>
ABSL_DEPRECATE_AND_INLINE()
inline auto ToString(T p) ->
typename std::enable_if<!internal::is_absl_strcat_callable<T>::value &&
std::is_pointer<T>::value,
std::string>::type {
return webrtc::StringFormat("%p", p);
}
template <typename T>
ABSL_DEPRECATE_AND_INLINE()
inline auto ToString(T value) ->
typename std::enable_if<!std::is_pointer_v<T> && std::is_same_v<T, bool>,
std::string>::type {
return webrtc::BoolToString(value);
}
} // namespace rtc
#endif // WEBRTC_ALLOW_DEPRECATED_NAMESPACES
#endif // RTC_BASE_STRING_ENCODE_H__
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