llvm/llvm/include/llvm/ObjectYAML/YAML.h

//===- YAML.h ---------------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_OBJECTYAML_YAML_H
#define LLVM_OBJECTYAML_YAML_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/YAMLTraits.h"
#include <cstdint>

namespace llvm {

class raw_ostream;

namespace yaml {

/// Specialized YAMLIO scalar type for representing a binary blob.
///
/// A typical use case would be to represent the content of a section in a
/// binary file.
/// This class has custom YAMLIO traits for convenient reading and writing.
/// It renders as a string of hex digits in a YAML file.
/// For example, it might render as `DEADBEEFCAFEBABE` (YAML does not
/// require the quotation marks, so for simplicity when outputting they are
/// omitted).
/// When reading, any string whose content is an even number of hex digits
/// will be accepted.
/// For example, all of the following are acceptable:
/// `DEADBEEF`, `"DeADbEeF"`, `"\x44EADBEEF"` (Note: '\x44' == 'D')
///
/// A significant advantage of using this class is that it never allocates
/// temporary strings or buffers for any of its functionality.
///
/// Example:
///
/// The YAML mapping:
/// \code
/// Foo: DEADBEEFCAFEBABE
/// \endcode
///
/// Could be modeled in YAMLIO by the struct:
/// \code
/// struct FooHolder {
///   BinaryRef Foo;
/// };
/// namespace llvm {
/// namespace yaml {
/// template <>
/// struct MappingTraits<FooHolder> {
///   static void mapping(IO &IO, FooHolder &FH) {
///     IO.mapRequired("Foo", FH.Foo);
///   }
/// };
/// } // end namespace yaml
/// } // end namespace llvm
/// \endcode
class BinaryRef { … };

inline bool operator==(const BinaryRef &LHS, const BinaryRef &RHS) { … }

template <> struct ScalarTraits<BinaryRef> { … };

} // end namespace yaml

} // end namespace llvm

#endif // LLVM_OBJECTYAML_YAML_H