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