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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
type
Line = object
x: int
columns: seq[int]
Field* = object
x, y: int
lx: int
lines: seq[Line]
func Blank*(f: var Field, x, y: int) =
let ly = f.lines.len
if y < f.y or y >= f.y+ly: # outside the field
return
var l = addr f.lines[y-f.y]
let ll = l.columns.len
if x < l.x or x >= l.x+ll: # outside the field
return
if x > l.x and x < l.x+ll-1: # just set the value
l.columns[x-l.x] = int(' ')
return
if ll == 1: # this was the last character on the line
if y == f.y: # we need to trim the leading lines
var i = 1
while f.lines[i].columns.len == 0:
inc i
f.y += i
f.lines = f.lines[i..<ly]
elif y == f.y+ly-1: # we need to trim the trailing lines
var i = ly-2
while f.lines[i].columns.len == 0:
dec i
f.lines = f.lines[0..i]
else: # it was a line in the middle
l.columns = @[]
elif x == l.x: # we need to remove leading spaces
var i = 1
while l.columns[i] == int(' '):
inc i
l.x += i
l.columns = l.columns[i..<ll]
elif x == ll+l.x-1: # we need to remove trailing spaces
var i = ll-2
while l.columns[i] == int(' '):
dec i
l.columns = l.columns[0..i]
# we now need to calculate the new field limits
f.x = f.lines[0].x
var x2 = f.lines[0].columns.len + f.lines[0].x
for i in 1..<f.lines.len:
if f.lines[i].columns.len == 0:
continue
if f.x > f.lines[i].x:
f.x = f.lines[i].x
if x2 < f.lines[i].x + f.lines[i].columns.len:
x2 = f.lines[i].x + f.lines[i].columns.len
f.lx = x2-f.x
func Get*(f: Field, x, y: int): int =
if y >= f.y and y < f.y+f.lines.len:
let l = f.lines[y-f.y]
if x >= l.x and x < l.x+l.columns.len:
return l.columns[x-l.x]
return int(' ')
func IsIn*(f: Field, x, y: int): bool =
return x >= f.x and y >= f.y and x < f.x+f.lx and y < f.y+f.lines.len
func Set*(f: var Field, x, y, v: int) =
if v == int(' '):
f.Blank(x, y)
return
elif y >= f.y:
if y < f.y+f.lines.len: # the line exists
var l = addr f.lines[y-f.y]
if l.columns.len == 0: # An empty line is a special case
l.x = x
l.columns = @[v]
if f.x > x:
f.lx = f.lx+f.x-x
f.x = x
if f.lx < x-f.x+1:
f.lx = x-f.x+1
elif x >= l.x:
if x < l.x+l.columns.len: # just set the value
l.columns[x-l.x] = v
else: # append columns
let oldL = l.columns.len
l.columns.setlen(x-l.x+1)
for i in oldL..<l.columns.len-1:
l.columns[i] = int(' ')
l.columns[^1] = v
if f.lx < l.columns.len+l.x-f.x:
f.lx = l.columns.len+l.x-f.x
else: # preprend columns
var newline = newSeqUninitialized[int](l.columns.len+l.x-x)
newline[0] = v
for i in 1..<l.x-x:
newline[i] = int(' ')
for i in l.x-x..<newline.len:
newline[i] = l.columns[i-l.x+x]
l.columns = newline
l.x = x
if f.x > x:
f.lx = f.lx + f.x - x
f.x = x
else: # append lines
if f.lines.len == 0: # is it the first line of the field
f.lines.setlen(1)
f.x = x
f.y = y
f.lx = 1
else:
f.lines.setlen(y-f.y+1)
if f.x > x:
f.lx = f.lx + f.x - x
f.x = x
if f.lx < x-f.x+1:
f.lx = x-f.x+1
f.lines[y-f.y] = Line(x: x, columns: @[v])
else: # prepend lines
var newlines = newSeq[Line](f.lines.len+f.y-y)
newlines[0] = Line(x: x, columns: @[v])
for i in f.y-y..<newlines.len:
newlines[i] = f.lines[i-f.y+y]
f.lines = newlines
f.y = y
if f.x > x:
f.lx = f.lx+f.x-x
f.x = x
if f.lx < x-f.x+1:
f.lx = x-f.x+1
proc Load*(filename: string): ref Field =
var file: File
if not open(file, filename):
return nil
defer: file.close()
var f: ref Field
new(f)
var lastReadIsCR = false
var x = 0
var y = 0
while true:
var data: array[4096, char]
let n = file.readChars(data)
if n <= 0:
break
var i = 0
while i < n:
if lastReadIsCR:
lastReadIsCR = false
if data[i] == '\n':
inc i
continue
if data[i] == char(12):
discard
elif data[i] == '\r':
x = 0
inc y
lastReadIsCR = true
elif data[i] == '\n':
x = 0
inc y
#elif data[i] == ' ':
# inc x
else:
f[].Set(x, y, int(data[i]))
inc x
inc i
return f
func Step*(f: Field, v: tuple[x, y: int], d: tuple[x, y: int]): (int, int) =
var x = v.x + d.x
var y = v.y + d.y
if f.IsIn(x, y):
return (x, y)
# We are stepping outside, we need to wrap the Lahey-space
x = v.x
y = v.y
while true:
let x2 = x - d.x
let y2 = y - d.y
if not f.IsIn(x2, y2):
return (x, y)
x = x2; y = y2
func GetSize*(f: Field): (int, int, int, int) =
return (f.x, f.y, f.lx, f.lines.len)
|
