mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-23 10:53:10 +00:00
9166d0eb64
Rewrites a good amount of legality APIs pertaining to: * Legal moves that can be learned * Evolution chains & cross-generation paths * Memory validation with forgotten moves In generation 8, there are 3 separate contexts an entity can exist in: SW/SH, BD/SP, and LA. Not every entity can cross between them, and not every entity from generation 7 can exist in generation 8 (Gogoat, etc). By creating class models representing the restrictions to cross each boundary, we are able to better track and validate data. The old implementation of validating moves was greedy: it would iterate for all generations and evolutions, and build a full list of every move that can be learned, storing it on the heap. Now, we check one game group at a time to see if the entity can learn a move that hasn't yet been validated. End result is an algorithm that requires 0 allocation, and a smaller/quicker search space. The old implementation of storing move parses was inefficient; for each move that was parsed, a new object is created and adjusted depending on the parse. Now, move parse results are `struct` and store the move parse contiguously in memory. End result is faster parsing and 0 memory allocation. * `PersonalTable` objects have been improved with new API methods to check if a species+form can exist in the game. * `IEncounterTemplate` objects have been improved to indicate the `EntityContext` they originate in (similar to `Generation`). * Some APIs have been extended to accept `Span<T>` instead of Array/IEnumerable
63 lines
2.1 KiB
C#
63 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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using static System.Buffers.Binary.BinaryPrimitives;
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namespace PKHeX.Core;
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/// <summary>
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/// Generation 4 Evolution Branch Entries
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/// </summary>
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public static class EvolutionSet4
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{
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private static EvolutionMethod GetMethod(ReadOnlySpan<byte> data)
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{
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var method = data[0]; // other byte unnecessary
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var arg = ReadUInt16LittleEndian(data[2..]);
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var species = ReadUInt16LittleEndian(data[4..]);
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if (method == 0)
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throw new ArgumentOutOfRangeException(nameof(method));
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// To have the same structure as gen 6
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// Gen 4 Method 6 is Gen 6 Method 7, G4 7 = G6 8, and so on
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if (method > 6)
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method++;
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var lvl = EvolutionSet6.IsMethodWithArg(method) ? 0 : arg;
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var type = (EvolutionType)method;
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var lvlup = type.IsLevelUpRequired() ? (byte)1 : (byte)0;
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return new EvolutionMethod(type, species, Argument: arg, Level: (byte)lvl, LevelUp: lvlup);
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}
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public static IReadOnlyList<EvolutionMethod[]> GetArray(ReadOnlySpan<byte> data)
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{
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const int bpe = 6; // bytes per evolution entry
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const int entries = 7; // amount of entries per species
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const int size = (entries * bpe) + 2; // bytes per species entry, + 2 alignment bytes
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var evos = new EvolutionMethod[data.Length / size][];
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for (int i = 0; i < evos.Length; i++)
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{
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int offset = i * size;
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int count = 0;
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for (; count < entries; count++)
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{
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var methodOffset = offset + (count * bpe);
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var method = data[methodOffset];
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if (method == 0)
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break;
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}
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if (count == 0)
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{
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evos[i] = Array.Empty<EvolutionMethod>();
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continue;
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}
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var set = new EvolutionMethod[count];
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for (int j = 0; j < set.Length; j++)
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set[j] = GetMethod(data.Slice(offset + (j * bpe), bpe));
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evos[i] = set;
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}
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return evos;
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}
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}
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