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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
import std.bigint : BigInt;
import spots : OverlaySource, Spot;
import std.stdio;
import std.format;
struct Portal {
BigInt y;
BigInt x;
Portal* pair;
this(BigInt y, BigInt x) {
this.y = y;
this.x = x;
}
void pairWith(ref Portal p) {
this.pair = &p;
p.pair = &this;
}
void buildMap(ref int[Portal* ] idMap, ref int highId) {
idMap[&this] = highId++;
}
string toString(int[Portal* ] idMap)
in {
assert(pair == null || pair in idMap);
}
do {
if (pair == null)
return format!`%s, %s: -1`(y, x);
else
return format!`%s, %s: %d`(y, x, idMap[pair]);
}
void fromString(string s, Portal[int] portalsById) {
import std.conv : to;
import std.algorithm : until, findSkip;
import std.array : array;
this.y = to!BigInt(s.until(',').array);
s.findSkip(", ");
this.x = to!BigInt(s.until(':').array);
s.findSkip(": ");
int id;
s.formattedRead!"%d"(id);
auto p = id in portalsById;
if (p) {
p.pairWith(this);
}
}
}
class Portals {
private Portal[int] _portals;
private Portal* _lastPortal;
private int _nextId;
private OverlaySource _overlay;
this(OverlaySource overlay) {
_overlay = overlay;
}
int add(BigInt y, BigInt x) {
_portals[_nextId] = Portal(y, x);
if (_lastPortal && _lastPortal.pair == null) {
_lastPortal.pairWith(_portals[_nextId]);
}
_lastPortal = &(_portals[_nextId]);
_overlay[y, x] = Spot('/', _nextId);
return _nextId++;
}
Portal get(int id)
in {
assert(id in _portals);
}
do {
return _portals[id];
}
void remove(BigInt y, BigInt x) {
auto id = _overlay[y, x].id;
auto pair = _portals[id].pair;
if (pair) {
if (_lastPortal.pair == null) {
_lastPortal.pairWith(*pair);
} else {
pair.pair = null;
}
}
_lastPortal = _portals[id].pair;
_portals.remove(id);
_overlay[y, x] = Spot(' ');
}
immutable string terminator = "END PORTAL DATA\n";
void save(File f) {
int id = 0;
int[Portal* ] idMap;
foreach (ref key; _portals.byKey()) {
(key in _portals).buildMap(idMap, id);
}
foreach (ref key; _portals.byKey()) {
auto portalRef = key in _portals;
f.writefln!`%d @ %s`(idMap[portalRef], portalRef.toString(idMap));
}
f.write(terminator);
if (_lastPortal)
f.writefln!`%d`(idMap[_lastPortal]);
}
void load(File f) {
_nextId = 0;
foreach (char[] line; f.lines) {
if (line == terminator)
break;
int id;
string portalText;
line.formattedRead!`%d @ %s`(id, portalText);
_portals[id] = Portal();
_portals[id].fromString(portalText, _portals);
_overlay[_portals[id].y, _portals[id].x] = Spot('/', id);
_nextId++; // works if the file is guaranteed to use
// linearly incrementing id's
}
int id;
if (_nextId > 0) {
f.readf("%d\n", id);
_lastPortal = &(_portals[id]);
}
}
unittest {
import spots : RandomSource;
import std.stdio;
auto overlay = new OverlaySource(new RandomSource());
auto portals = new Portals(overlay);
portals.add(BigInt(0), BigInt(0));
portals.remove(BigInt(0), BigInt(0));
int orig = portals.add(BigInt(0), BigInt(0));
int sec = portals.add(BigInt(0), BigInt(1));
assert(*(portals.get(orig).pair) == portals.get(sec));
portals.remove(BigInt(0), BigInt(1));
sec = portals.add(BigInt(0), BigInt(2));
assert(*(portals.get(orig).pair) == portals.get(sec));
orig = portals.add(BigInt(0), BigInt(3));
portals.remove(BigInt(0), BigInt(0));
assert(*(portals.get(orig).pair) == portals.get(sec));
}
}
|
