1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
#pragma once
#include <unordered_map>
#include <utility>
#include "BlockState.h"
/** Holds a palette that maps between block type + state and numbers.
Used primarily by PalettedBlockArea to map from stringular block representation to numeric,
and by protocols to map from stringular block representation to protocol-numeric.
The object itself provides no thread safety, users of this class need to handle locking, if required.
Note that the palette itself doesn't support erasing;
to erase, create a new instance and re-add only the wanted items.
Internally, the object uses two synced maps, one for each translation direction. */
class BlockTypePalette
{
public:
/** Exception that is thrown if requiesting an index not present in the palette. */
class NoSuchIndexException:
public std::runtime_error
{
using Super = std::runtime_error;
public:
NoSuchIndexException(UInt32 aIndex):
Super(Printf("No such palette index: %u", aIndex))
{
}
};
/** Create a new empty instance. */
BlockTypePalette();
/** Returns the index of the specified block type name and state.
If the combination is not found, it is added to the palette and the new index is returned. */
UInt32 index(const AString & aBlockTypeName, const BlockState & aBlockState);
/** Returns the <index, true> of the specified block type name and state, if it exists.
If the combination is not found, returns <undefined, false>. */
std::pair<UInt32, bool> maybeIndex(const AString & aBlockTypeName, const BlockState & aBlockState) const;
/** Returns the total number of entries in the palette. */
UInt32 count() const;
/** Returns the blockspec represented by the specified palette index.
If the index is not valid, throws a NoSuchIndexException. */
const std::pair<AString, BlockState> & entry(UInt32 aIndex) const;
/** Returns an index-transform map from aFrom to this (this.entry(idx) == aFrom.entry(res[idx])).
Entries from aFrom that are not present in this are added.
Used when pasting two areas, to transform the src palette to dst palette. */
std::map<UInt32, UInt32> createTransformMapAddMissing(const BlockTypePalette & aFrom);
/** Returns an index-transform map from aFrom to this (this.entry(idx) == aFrom.entry(res[idx])).
Entries from aFrom that are not present in this are assigned the fallback index.
Used for protocol block type mapping. */
std::map<UInt32, UInt32> createTransformMapWithFallback(const BlockTypePalette & aFrom, UInt32 aFallbackIndex) const;
protected:
/** The mapping from numeric to stringular representation.
mNumberToBlock[index] = {"blockTypeName", blockState}. */
std::map<UInt32, std::pair<AString, BlockState>> mNumberToBlock;
/** The mapping from stringular to numeric representation.
mStringToNumber["blockTypeName"][blockState] = index. */
std::unordered_map<AString, std::map<BlockState, UInt32>> mBlockToNumber;
/** The maximum index ever used in the maps.
Used when adding new entries through the index() call. */
UInt32 mMaxIndex;
};
|
