blob: e73906d6344dba68e2971d62296090c0617ac7b0 (
plain) (
blame)
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
;; data structure: board
(primitive square)
(address square-address (square)) ; pointer. verbose but sadly necessary for now
(array file (square)) ; ranks and files are arrays of squares
(address file-address (file))
(address file-address-address (file-address)) ; pointer to a pointer
(array board (file-address))
(address board-address (board))
(function read-board [
(default-scope:scope-address <- new scope:literal 30:literal)
(initial-position:list-address <- init-list R:literal P:literal _:literal _:literal _:literal _:literal p:literal r:literal
N:literal P:literal _:literal _:literal _:literal _:literal p:literal n:literal
B:literal P:literal _:literal _:literal _:literal _:literal p:literal b:literal
Q:literal P:literal _:literal _:literal _:literal _:literal p:literal q:literal
K:literal P:literal _:literal _:literal _:literal _:literal p:literal k:literal
B:literal P:literal _:literal _:literal _:literal _:literal p:literal b:literal
N:literal P:literal _:literal _:literal _:literal _:literal p:literal n:literal
R:literal P:literal _:literal _:literal _:literal _:literal p:literal r:literal)
; assert(length(initial-position) == 64)
(len:integer <- list-length initial-position:list-address)
(correct-length?:boolean <- equal len:integer 64:literal)
(assert correct-length?:boolean (("chessboard had incorrect size" literal)))
(b:board-address <- new board:literal 8:literal)
(col:integer <- copy 0:literal)
(curr:list-address <- copy initial-position:list-address)
{ begin
(done?:boolean <- equal col:integer 8:literal)
(break-if done?:boolean)
(file:file-address-address <- index-address b:board-address/deref col:integer)
(file:file-address-address/deref curr:list-address <- read-file curr:list-address)
(col:integer <- add col:integer 1:literal)
(loop)
}
(reply b:board-address)
])
(function read-file [
(default-scope:scope-address <- new scope:literal 30:literal)
(cursor:list-address <- next-input)
(result:file-address <- new file:literal 8:literal)
(row:integer <- copy 0:literal)
{ begin
(done?:boolean <- equal row:integer 8:literal)
(break-if done?:boolean)
(src:tagged-value-address <- list-value-address cursor:list-address)
(dest:square-address <- index-address result:file-address/deref row:integer)
(dest:square-address/deref <- get src:tagged-value-address/deref payload:offset) ; unsafe typecast
(cursor:list-address <- list-next cursor:list-address)
(row:integer <- add row:integer 1:literal)
(loop)
}
(reply result:file-address cursor:list-address)
])
(function print-board [
(default-scope:scope-address <- new scope:literal 30:literal)
(b:board-address <- next-input)
(row:integer <- copy 7:literal)
; print each row
{ begin
(done?:boolean <- less-than row:integer 0:literal)
(break-if done?:boolean)
; print rank number as a legend
(rank:integer <- add row:integer 1:literal)
(print-primitive rank:integer)
(print-primitive ((" | " literal)))
; print each square in the row
(col:integer <- copy 0:literal)
{ begin
(done?:boolean <- equal col:integer 8:literal)
(break-if done?:boolean)
(f:file-address <- index b:board-address/deref col:integer)
(s:square <- index f:file-address/deref row:integer)
(print-primitive s:square)
(print-primitive ((" " literal)))
(col:integer <- add col:integer 1:literal)
(loop)
}
(row:integer <- subtract row:integer 1:literal)
(cursor-to-next-line)
(loop)
}
; print file letters as legend
(print-primitive ((" +----------------" literal)))
(cursor-to-next-line)
(print-primitive ((" a b c d e f g h" literal)))
(cursor-to-next-line)
])
;; data structure: move
(and-record move [
from:integer-integer-pair
to:integer-integer-pair
])
(address move-address (move))
(function read-move [
(a:character <- copy ((#\a literal)))
(file-base:integer <- character-to-integer a:character)
(one:character <- copy ((#\1 literal)))
(rank-base:integer <- character-to-integer one:character)
; get from-file
(c:character <- wait-for-key)
(print-primitive c:character)
{ begin
(quit:boolean <- equal c:character ((#\q literal)))
(break-unless quit:boolean)
(reply)
}
(from-file:integer <- character-to-integer c:character)
(from-file:integer <- subtract from-file:integer file-base:integer)
; assert('a' <= from-file <= 'h')
(above-min:boolean <- greater-or-equal from-file:integer 0:literal)
(assert above-min:boolean (("from-file too low" literal)))
(below-max:boolean <- lesser-or-equal from-file:integer 7:literal)
(assert below-max:boolean (("from-file too high" literal)))
; get from-rank
(c:character <- wait-for-key)
(print-primitive c:character)
(from-rank:integer <- character-to-integer c:character)
(from-rank:integer <- subtract from-rank:integer rank-base:integer)
; assert('1' <= from-rank <= '8')
(above-min:boolean <- greater-or-equal from-rank:integer 0:literal)
(assert above-min:boolean (("from-rank too low" literal)))
(below-max:boolean <- lesser-or-equal from-rank:integer 7:literal)
(assert below-max:boolean (("from-rank too high" literal)))
; slurp hyphen
(c:character <- wait-for-key)
(print-primitive c:character)
(hyphen?:boolean <- equal c:character ((#\- literal)))
(assert hyphen?:boolean (("expected hyphen" literal)))
; get to-file
(c:character <- wait-for-key)
(print-primitive c:character)
(to-file:integer <- character-to-integer c:character)
(to-file:integer <- subtract to-file:integer file-base:integer)
; assert('a' <= to-file <= 'h')
(above-min:boolean <- greater-or-equal to-file:integer 0:literal)
(assert above-min:boolean (("to-file too low" literal)))
(below-max:boolean <- lesser-or-equal to-file:integer 7:literal)
(assert below-max:boolean (("to-file too high" literal)))
; get to-rank
(c:character <- wait-for-key)
(print-primitive c:character)
(to-rank:integer <- character-to-integer c:character)
(to-rank:integer <- subtract to-rank:integer rank-base:integer)
; assert('1' <= to-rank <= '8')
(above-min:boolean <- greater-or-equal to-rank:integer 0:literal)
(assert above-min:boolean (("to-rank too low" literal)))
(below-max:boolean <- lesser-or-equal to-rank:integer 7:literal)
(assert below-max:boolean (("to-rank too high" literal)))
; construct the move object
(result:move-address <- new move:literal)
(f:integer-integer-pair-address <- get-address result:move-address/deref from:offset)
(dest:integer-address <- get-address f:integer-integer-pair-address/deref 0:offset)
(dest:integer-address/deref <- copy from-file:integer)
(dest:integer-address <- get-address f:integer-integer-pair-address/deref 1:offset)
(dest:integer-address/deref <- copy from-rank:integer)
(t0:integer-integer-pair-address <- get-address result:move-address/deref to:offset)
(dest:integer-address <- get-address t0:integer-integer-pair-address/deref 0:offset)
(dest:integer-address/deref <- copy to-file:integer)
(dest:integer-address <- get-address t0:integer-integer-pair-address/deref 1:offset)
(dest:integer-address/deref <- copy to-rank:integer)
(reply result:move-address)
])
(function make-move [
(default-scope:scope-address <- new scope:literal 30:literal)
(b:board-address <- next-input)
(m:move-address <- next-input)
(x:integer-integer-pair <- get m:move-address/deref from:offset)
(from-file:integer <- get x:integer-integer-pair 0:offset)
(from-rank:integer <- get x:integer-integer-pair 1:offset)
(f:file-address <- index b:board-address/deref from-file:integer)
(src:square-address <- index-address f:file-address/deref from-rank:integer)
(x:integer-integer-pair <- get m:move-address/deref to:offset)
(to-file:integer <- get x:integer-integer-pair 0:offset)
(to-rank:integer <- get x:integer-integer-pair 1:offset)
(f:file-address <- index b:board-address/deref to-file:integer)
(dest:square-address <- index-address f:file-address/deref to-rank:integer)
(dest:square-address/deref <- copy src:square-address/deref)
(src:square-address/deref <- copy _:literal)
(reply b:board-address)
])
(function main [
(default-scope:scope-address <- new scope:literal 30:literal)
(b:board-address <- read-board)
(console-on)
{ begin
(clear-screen)
(print-primitive (("Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves." literal)))
(cursor-to-next-line)
(cursor-to-next-line)
(print-board b:board-address)
(cursor-to-next-line)
(print-primitive (("Type in your move as <from square>-<to square>. For example: a2-a4. Lowercase only. Currently very unforgiving of typos." literal)))
(cursor-to-next-line)
(print-primitive (("Hit 'q' to exit." literal)))
(cursor-to-next-line)
(print-primitive (("move: " literal)))
(m:move-address <- read-move)
(break-unless m:move-address)
(b:board-address <- make-move b:board-address m:move-address)
(loop)
}
(console-off)
])
|