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4296425bd8
C++20 can automatically synthesize `operator!=` from `operator==`, so there is no point in writing such functions by hand if all they do is call through to `operator==`. This fixes a compile error with compilers that implement P2468 (Clang 16 currently). This paper restores the C++17 behavior that if both `T::operator==(U)` and `T::operator!=(U)` exist, `U == T` won't be rewritten in reverse to call `T::operator==(U)`. Removing `!=` operators makes the rewriting possible again. See https://reviews.llvm.org/D134529#3853062
99 lines
1.9 KiB
C++
99 lines
1.9 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace AK {
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class JsonPathElement {
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public:
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enum class Kind {
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Key,
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Index,
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AnyIndex,
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AnyKey,
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};
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JsonPathElement(size_t index)
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: m_kind(Kind::Index)
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, m_index(index)
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{
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}
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JsonPathElement(StringView key)
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: m_kind(Kind::Key)
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, m_key(key)
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{
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}
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Kind kind() const { return m_kind; }
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String const& key() const
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{
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VERIFY(m_kind == Kind::Key);
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return m_key;
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}
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size_t index() const
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{
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VERIFY(m_kind == Kind::Index);
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return m_index;
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}
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String to_string() const
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{
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switch (m_kind) {
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case Kind::Key:
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return key();
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case Kind::Index:
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return String::number(index());
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default:
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return "*";
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}
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}
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static JsonPathElement any_array_element;
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static JsonPathElement any_object_element;
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bool operator==(JsonPathElement const& other) const
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{
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switch (other.kind()) {
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case Kind::Key:
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return (m_kind == Kind::Key && other.key() == key()) || m_kind == Kind::AnyKey;
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case Kind::Index:
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return (m_kind == Kind::Index && other.index() == index()) || m_kind == Kind::AnyIndex;
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case Kind::AnyKey:
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return m_kind == Kind::Key;
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case Kind::AnyIndex:
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return m_kind == Kind::Index;
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}
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return false;
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}
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private:
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Kind m_kind;
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String m_key;
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size_t m_index { 0 };
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JsonPathElement(Kind kind)
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: m_kind(kind)
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{
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}
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};
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class JsonPath : public Vector<JsonPathElement> {
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public:
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JsonValue resolve(JsonValue const&) const;
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String to_string() const;
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};
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}
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using AK::JsonPath;
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using AK::JsonPathElement;
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