Repo created

TMessagesProj/jni/voip/webrtc/absl/log/internal/structured.h

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+// Copyright 2022 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: log/internal/structured.h
+// -----------------------------------------------------------------------------
+
+#ifndef ABSL_LOG_INTERNAL_STRUCTURED_H_
+#define ABSL_LOG_INTERNAL_STRUCTURED_H_
+
+#include <ostream>
+#include <string>
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/functional/any_invocable.h"
+#include "absl/log/internal/log_message.h"
+#include "absl/log/internal/structured_proto.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace log_internal {
+
+class ABSL_MUST_USE_RESULT AsLiteralImpl final {
+ public:
+  explicit AsLiteralImpl(absl::string_view str ABSL_ATTRIBUTE_LIFETIME_BOUND)
+      : str_(str) {}
+  AsLiteralImpl(const AsLiteralImpl&) = default;
+  AsLiteralImpl& operator=(const AsLiteralImpl&) = default;
+
+ private:
+  absl::string_view str_;
+
+  friend std::ostream& operator<<(std::ostream& os,
+                                  AsLiteralImpl&& as_literal) {
+    return os << as_literal.str_;
+  }
+  void AddToMessage(log_internal::LogMessage& m) {
+    m.CopyToEncodedBuffer<log_internal::LogMessage::StringType::kLiteral>(str_);
+  }
+  friend log_internal::LogMessage& operator<<(log_internal::LogMessage& m,
+                                              AsLiteralImpl as_literal) {
+    as_literal.AddToMessage(m);
+    return m;
+  }
+};
+
+enum class StructuredStringType {
+  kLiteral,
+  kNotLiteral,
+};
+
+// Structured log data for a string and associated structured proto field,
+// both of which must outlive this object.
+template <StructuredStringType str_type>
+class ABSL_MUST_USE_RESULT AsStructuredStringTypeImpl final {
+ public:
+  constexpr AsStructuredStringTypeImpl(
+      absl::string_view str ABSL_ATTRIBUTE_LIFETIME_BOUND,
+      StructuredProtoField field ABSL_ATTRIBUTE_LIFETIME_BOUND)
+      : str_(str), field_(field) {}
+
+ private:
+  absl::string_view str_;
+  StructuredProtoField field_;
+
+  friend std::ostream& operator<<(std::ostream& os,
+                                  const AsStructuredStringTypeImpl& impl) {
+    return os << impl.str_;
+  }
+  void AddToMessage(LogMessage& m) const {
+    if (str_type == StructuredStringType::kLiteral) {
+      return m.CopyToEncodedBufferWithStructuredProtoField<
+          log_internal::LogMessage::StringType::kLiteral>(field_, str_);
+    } else {
+      return m.CopyToEncodedBufferWithStructuredProtoField<
+          log_internal::LogMessage::StringType::kNotLiteral>(field_, str_);
+    }
+  }
+  friend LogMessage& operator<<(LogMessage& m,
+                                const AsStructuredStringTypeImpl& impl) {
+    impl.AddToMessage(m);
+    return m;
+  }
+};
+
+using AsStructuredLiteralImpl =
+    AsStructuredStringTypeImpl<StructuredStringType::kLiteral>;
+using AsStructuredNotLiteralImpl =
+    AsStructuredStringTypeImpl<StructuredStringType::kNotLiteral>;
+
+// Structured log data for a stringifyable type T and associated structured
+// proto field, both of which must outlive this object.
+template <typename T>
+class ABSL_MUST_USE_RESULT AsStructuredValueImpl final {
+ public:
+  using ValueFormatter = absl::AnyInvocable<std::string(T) const>;
+
+  constexpr AsStructuredValueImpl(
+      T value ABSL_ATTRIBUTE_LIFETIME_BOUND,
+      StructuredProtoField field ABSL_ATTRIBUTE_LIFETIME_BOUND,
+      ValueFormatter value_formatter =
+          [](T value) { return absl::StrCat(value); })
+      : value_(value),
+        field_(field),
+        value_formatter_(std::move(value_formatter)) {}
+
+ private:
+  T value_;
+  StructuredProtoField field_;
+  ValueFormatter value_formatter_;
+
+  friend std::ostream& operator<<(std::ostream& os,
+                                  const AsStructuredValueImpl& impl) {
+    return os << impl.value_formatter_(impl.value_);
+  }
+  void AddToMessage(LogMessage& m) const {
+    m.CopyToEncodedBufferWithStructuredProtoField<
+        log_internal::LogMessage::StringType::kNotLiteral>(
+        field_, value_formatter_(value_));
+  }
+  friend LogMessage& operator<<(LogMessage& m,
+                                const AsStructuredValueImpl& impl) {
+    impl.AddToMessage(m);
+    return m;
+  }
+};
+
+#ifdef ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION
+
+// Template deduction guide so `AsStructuredValueImpl(42, data)` works
+// without specifying the template type.
+template <typename T>
+AsStructuredValueImpl(T value, StructuredProtoField field)
+    -> AsStructuredValueImpl<T>;
+
+// Template deduction guide so `AsStructuredValueImpl(42, data, formatter)`
+// works without specifying the template type.
+template <typename T>
+AsStructuredValueImpl(
+    T value, StructuredProtoField field,
+    typename AsStructuredValueImpl<T>::ValueFormatter value_formatter)
+    -> AsStructuredValueImpl<T>;
+
+#endif  // ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION
+
+}  // namespace log_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_INTERNAL_STRUCTURED_H_