GT2/Ejectable/node_modules/react-native/ReactCommon/fabric/attributedstring/AttributedString.h

140 lines
3.5 KiB
C++

/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <functional>
#include <memory>
#include <folly/Hash.h>
#include <folly/Optional.h>
#include <react/attributedstring/TextAttributes.h>
#include <react/core/Sealable.h>
#include <react/core/ShadowNode.h>
#include <react/debug/DebugStringConvertible.h>
#include <react/mounting/ShadowView.h>
namespace facebook {
namespace react {
class AttributedString;
using SharedAttributedString = std::shared_ptr<const AttributedString>;
/*
* Simple, cross-platfrom, React-specific implementation of attributed string
* (aka spanned string).
* `AttributedString` is basically a list of `Fragments` which have `string` and
* `textAttributes` + `shadowNode` associated with the `string`.
*/
class AttributedString : public Sealable, public DebugStringConvertible {
public:
class Fragment {
public:
static std::string AttachmentCharacter();
std::string string;
TextAttributes textAttributes;
ShadowView parentShadowView;
/*
* Returns true is the Fragment represents an attachment.
* Equivalent to `string == AttachmentCharacter()`.
*/
bool isAttachment() const;
bool operator==(const Fragment &rhs) const;
bool operator!=(const Fragment &rhs) const;
};
class Range {
public:
int location{0};
int length{0};
};
using Fragments = better::small_vector<Fragment, 1>;
/*
* Appends and prepends a `fragment` to the string.
*/
void appendFragment(const Fragment &fragment);
void prependFragment(const Fragment &fragment);
/*
* Appends and prepends an `attributedString` (all its fragments) to
* the string.
*/
void appendAttributedString(const AttributedString &attributedString);
void prependAttributedString(const AttributedString &attributedString);
/*
* Returns a read-only reference to a list of fragments.
*/
Fragments const &getFragments() const;
/*
* Returns a reference to a list of fragments.
*/
Fragments &getFragments();
/*
* Returns a string constructed from all strings in all fragments.
*/
std::string getString() const;
/*
* Returns `true` if the string is empty (has no any fragments).
*/
bool isEmpty() const;
/**
* Compares equality of TextAttributes of all Fragments on both sides.
*/
bool compareTextAttributesWithoutFrame(const AttributedString &rhs) const;
bool operator==(const AttributedString &rhs) const;
bool operator!=(const AttributedString &rhs) const;
#pragma mark - DebugStringConvertible
#if RN_DEBUG_STRING_CONVERTIBLE
SharedDebugStringConvertibleList getDebugChildren() const override;
#endif
private:
Fragments fragments_;
};
} // namespace react
} // namespace facebook
namespace std {
template <>
struct hash<facebook::react::AttributedString::Fragment> {
size_t operator()(
const facebook::react::AttributedString::Fragment &fragment) const {
return folly::hash::hash_combine(
0, fragment.string, fragment.textAttributes, fragment.parentShadowView);
}
};
template <>
struct hash<facebook::react::AttributedString> {
size_t operator()(
const facebook::react::AttributedString &attributedString) const {
auto seed = size_t{0};
for (const auto &fragment : attributedString.getFragments()) {
seed = folly::hash::hash_combine(seed, fragment);
}
return seed;
}
};
} // namespace std