359 lines
10 KiB
C++
359 lines
10 KiB
C++
// This file Copyright © 2008-2023 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#include <algorithm>
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#include <cstddef> // size_t
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#include <cstdint> // int64_t
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#include <optional>
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#include <string>
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#include <string_view>
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#include "libtransmission/quark.h"
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struct tr_error;
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/**
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* @addtogroup tr_variant Variant
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*
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* An object that acts like a union for
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* integers, strings, lists, dictionaries, booleans, and floating-point numbers.
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* The structure is named `tr_variant` due to the historical reason that it was
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* originally tightly coupled with bencoded data. It currently supports
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* being parsed from, and serialized to, both bencoded notation and json notation.
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*
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* @{
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*/
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/* these are PRIVATE IMPLEMENTATION details that should not be touched.
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* I'll probably change them just to break your code! HA HA HA!
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* it's included in the header for inlining and composition */
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enum
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{
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TR_VARIANT_TYPE_INT = 1,
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TR_VARIANT_TYPE_STR = 2,
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TR_VARIANT_TYPE_LIST = 4,
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TR_VARIANT_TYPE_DICT = 8,
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TR_VARIANT_TYPE_BOOL = 16,
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TR_VARIANT_TYPE_REAL = 32
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};
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/* These are PRIVATE IMPLEMENTATION details that should not be touched.
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* I'll probably change them just to break your code! HA HA HA!
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* it's included in the header for inlining and composition */
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struct tr_variant
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{
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private:
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struct String
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{
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void set_shallow(std::string_view newval)
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{
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clear();
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type_ = Type::View;
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str_.str = std::data(newval);
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len_ = std::size(newval);
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}
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void set(std::string_view newval)
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{
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clear();
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len_ = std::size(newval);
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if (len_ < sizeof(str_.buf))
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{
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type_ = Type::Buf;
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std::copy_n(std::data(newval), len_, str_.buf);
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str_.buf[len_] = '\0';
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}
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else
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{
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char* const newstr = new char[len_ + 1];
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std::copy_n(std::data(newval), len_, newstr);
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newstr[len_] = '\0';
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type_ = Type::Heap;
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str_.str = newstr;
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}
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}
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[[nodiscard]] constexpr std::string_view get() const noexcept
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{
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return { type_ == Type::Buf ? str_.buf : str_.str, len_ };
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}
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void clear()
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{
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if (type_ == Type::Heap)
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{
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delete[] str_.str;
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}
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*this = {};
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}
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private:
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enum class Type
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{
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Heap,
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Buf,
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View
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};
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Type type_ = Type::View;
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size_t len_ = 0U;
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union
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{
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char buf[16];
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char const* str;
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} str_ = {};
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};
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public:
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char type = '\0';
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tr_quark key = TR_KEY_NONE;
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union
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{
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bool b;
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double d;
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int64_t i;
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String s;
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struct
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{
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size_t alloc;
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size_t count;
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struct tr_variant* vals;
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} l;
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} val = {};
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};
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/**
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* @brief Clear the variant to an empty state.
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*
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* `tr_variantIsEmpty()` will return true after this is called.
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*
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* The variant itself is not freed, but any memory used by
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* its *value* -- e.g. a string or child variants -- is freed.
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*/
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void tr_variantClear(tr_variant* clearme);
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// --- Serialization / Deserialization
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enum tr_variant_fmt
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{
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TR_VARIANT_FMT_BENC,
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TR_VARIANT_FMT_JSON,
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TR_VARIANT_FMT_JSON_LEAN /* saves bandwidth by omitting all whitespace. */
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};
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int tr_variantToFile(tr_variant const* variant, tr_variant_fmt fmt, std::string_view filename);
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[[nodiscard]] std::string tr_variantToStr(tr_variant const* variant, tr_variant_fmt fmt);
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enum tr_variant_parse_opts
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{
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TR_VARIANT_PARSE_BENC = (1 << 0),
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TR_VARIANT_PARSE_JSON = (1 << 1),
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TR_VARIANT_PARSE_INPLACE = (1 << 2)
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};
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bool tr_variantFromFile(
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tr_variant* setme,
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tr_variant_parse_opts opts,
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std::string_view filename,
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struct tr_error** error = nullptr);
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bool tr_variantFromBuf(
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tr_variant* setme,
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int variant_parse_opts,
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std::string_view buf,
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char const** setme_end = nullptr,
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tr_error** error = nullptr);
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template<typename T>
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bool tr_variantFromBuf(
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tr_variant* setme,
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int variant_parse_opts,
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T const& buf,
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char const** setme_end = nullptr,
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tr_error** error = nullptr)
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{
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return tr_variantFromBuf(
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setme,
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variant_parse_opts,
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std::string_view{ std::data(buf), static_cast<size_t>(std::size(buf)) },
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setme_end,
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error);
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}
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[[nodiscard]] constexpr bool tr_variantIsType(tr_variant const* b, int type)
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{
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return b != nullptr && b->type == type;
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}
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[[nodiscard]] constexpr bool tr_variantIsEmpty(tr_variant const* b)
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{
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return b == nullptr || b->type == '\0';
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}
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// --- Strings
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[[nodiscard]] constexpr bool tr_variantIsString(tr_variant const* b)
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{
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return b != nullptr && b->type == TR_VARIANT_TYPE_STR;
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}
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bool tr_variantGetStrView(tr_variant const* variant, std::string_view* setme);
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void tr_variantInitStr(tr_variant* initme, std::string_view value);
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void tr_variantInitQuark(tr_variant* initme, tr_quark value);
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void tr_variantInitRaw(tr_variant* initme, void const* value, size_t value_len);
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void tr_variantInitStrView(tr_variant* initme, std::string_view val);
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constexpr void tr_variantInit(tr_variant* initme, char type)
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{
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initme->val = {};
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initme->type = type;
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}
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bool tr_variantGetRaw(tr_variant const* variant, std::byte const** setme_raw, size_t* setme_len);
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bool tr_variantGetRaw(tr_variant const* variant, uint8_t const** setme_raw, size_t* setme_len);
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// --- Real Numbers
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[[nodiscard]] constexpr bool tr_variantIsReal(tr_variant const* v)
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{
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return v != nullptr && v->type == TR_VARIANT_TYPE_REAL;
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}
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bool tr_variantGetReal(tr_variant const* variant, double* value_setme);
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constexpr void tr_variantInitReal(tr_variant* initme, double value)
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{
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tr_variantInit(initme, TR_VARIANT_TYPE_REAL);
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initme->val.d = value;
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}
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// --- Booleans
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[[nodiscard]] constexpr bool tr_variantIsBool(tr_variant const* v)
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{
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return v != nullptr && v->type == TR_VARIANT_TYPE_BOOL;
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}
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bool tr_variantGetBool(tr_variant const* variant, bool* setme);
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constexpr void tr_variantInitBool(tr_variant* initme, bool value)
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{
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tr_variantInit(initme, TR_VARIANT_TYPE_BOOL);
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initme->val.b = value;
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}
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// --- Ints
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[[nodiscard]] constexpr bool tr_variantIsInt(tr_variant const* v)
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{
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return v != nullptr && v->type == TR_VARIANT_TYPE_INT;
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}
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bool tr_variantGetInt(tr_variant const* val, int64_t* setme);
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constexpr void tr_variantInitInt(tr_variant* initme, int64_t value)
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{
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tr_variantInit(initme, TR_VARIANT_TYPE_INT);
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initme->val.i = value;
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}
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// --- Lists
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[[nodiscard]] constexpr bool tr_variantIsList(tr_variant const* v)
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{
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return v != nullptr && v->type == TR_VARIANT_TYPE_LIST;
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}
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void tr_variantInitList(tr_variant* initme, size_t reserve_count);
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void tr_variantListReserve(tr_variant* list, size_t reserve_count);
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tr_variant* tr_variantListAdd(tr_variant* list);
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tr_variant* tr_variantListAddBool(tr_variant* list, bool value);
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tr_variant* tr_variantListAddInt(tr_variant* list, int64_t value);
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tr_variant* tr_variantListAddReal(tr_variant* list, double value);
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tr_variant* tr_variantListAddStr(tr_variant* list, std::string_view value);
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tr_variant* tr_variantListAddStrView(tr_variant* list, std::string_view value);
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tr_variant* tr_variantListAddQuark(tr_variant* list, tr_quark value);
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tr_variant* tr_variantListAddRaw(tr_variant* list, void const* value, size_t value_len);
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tr_variant* tr_variantListAddList(tr_variant* list, size_t reserve_count);
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tr_variant* tr_variantListAddDict(tr_variant* list, size_t reserve_count);
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tr_variant* tr_variantListChild(tr_variant* list, size_t pos);
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bool tr_variantListRemove(tr_variant* list, size_t pos);
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[[nodiscard]] constexpr size_t tr_variantListSize(tr_variant const* list)
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{
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return tr_variantIsList(list) ? list->val.l.count : 0;
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}
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// --- Dictionaries
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[[nodiscard]] constexpr bool tr_variantIsDict(tr_variant const* v)
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{
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return v != nullptr && v->type == TR_VARIANT_TYPE_DICT;
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}
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void tr_variantInitDict(tr_variant* initme, size_t reserve_count);
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void tr_variantDictReserve(tr_variant* dict, size_t reserve_count);
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bool tr_variantDictRemove(tr_variant* dict, tr_quark key);
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tr_variant* tr_variantDictAdd(tr_variant* dict, tr_quark key);
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tr_variant* tr_variantDictAddReal(tr_variant* dict, tr_quark key, double value);
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tr_variant* tr_variantDictAddInt(tr_variant* dict, tr_quark key, int64_t value);
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tr_variant* tr_variantDictAddBool(tr_variant* dict, tr_quark key, bool value);
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tr_variant* tr_variantDictAddStr(tr_variant* dict, tr_quark key, std::string_view value);
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tr_variant* tr_variantDictAddStrView(tr_variant* dict, tr_quark key, std::string_view value);
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tr_variant* tr_variantDictAddQuark(tr_variant* dict, tr_quark key, tr_quark val);
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tr_variant* tr_variantDictAddList(tr_variant* dict, tr_quark key, size_t reserve_count);
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tr_variant* tr_variantDictAddDict(tr_variant* dict, tr_quark key, size_t reserve_count);
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tr_variant* tr_variantDictSteal(tr_variant* dict, tr_quark key, tr_variant* value);
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tr_variant* tr_variantDictAddRaw(tr_variant* dict, tr_quark key, void const* value, size_t len);
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bool tr_variantDictChild(tr_variant* dict, size_t pos, tr_quark* setme_key, tr_variant** setme_value);
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tr_variant* tr_variantDictFind(tr_variant* dict, tr_quark key);
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bool tr_variantDictFindList(tr_variant* dict, tr_quark key, tr_variant** setme);
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bool tr_variantDictFindDict(tr_variant* dict, tr_quark key, tr_variant** setme_value);
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bool tr_variantDictFindInt(tr_variant* dict, tr_quark key, int64_t* setme);
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bool tr_variantDictFindReal(tr_variant* dict, tr_quark key, double* setme);
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bool tr_variantDictFindBool(tr_variant* dict, tr_quark key, bool* setme);
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bool tr_variantDictFindStrView(tr_variant* dict, tr_quark key, std::string_view* setme);
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bool tr_variantDictFindRaw(tr_variant* dict, tr_quark key, uint8_t const** setme_raw, size_t* setme_len);
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bool tr_variantDictFindRaw(tr_variant* dict, tr_quark key, std::byte const** setme_raw, size_t* setme_len);
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/* this is only quasi-supported. don't rely on it too heavily outside of libT */
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void tr_variantMergeDicts(tr_variant* dict_target, tr_variant const* dict_source);
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namespace libtransmission
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{
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struct VariantConverter
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{
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public:
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template<typename T>
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static std::optional<T> load(tr_variant* src);
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template<typename T>
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static void save(tr_variant* tgt, T const& val);
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};
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} // namespace libtransmission
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/* @} */
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