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;; 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 init-board [
(default-space:space-address <- new space:literal 30:literal)
(initial-position:integer-array-address <- next-input)
; assert(length(initial-position) == 64)
;? ($print initial-position:integer-array-address/deref) ;? 1
(len:integer <- length initial-position:integer-array-address/deref)
;? ($print len:integer) ;? 1
;? ($print (("\n" literal))) ;? 1
(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)
{ 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 <- init-file initial-position:integer-array-address col:integer)
(col:integer <- add col:integer 1:literal)
(loop)
}
(reply b:board-address)
])
(function init-file [
(default-space:space-address <- new space:literal 30:literal)
(position:integer-array-address <- next-input)
(index:integer <- next-input)
(index:integer <- multiply index:integer 8:literal)
(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)
(dest:square-address <- index-address result:file-address/deref row:integer)
(dest:square-address/deref <- index position:integer-array-address/deref index:integer)
(row:integer <- add row:integer 1:literal)
(index:integer <- add index:integer 1:literal)
(loop)
}
(reply result:file-address)
])
(function print-board [
(default-space:space-address <- new space:literal 30:literal)
(screen:terminal-address <- next-input)
(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-integer screen:terminal-address rank:integer)
(s:string-address <- new " | ")
(print-string screen:terminal-address s:string-address)
; 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-character screen:terminal-address s:square)
(print-character screen:terminal-address ((#\space literal)))
(col:integer <- add col:integer 1:literal)
(loop)
}
(row:integer <- subtract row:integer 1:literal)
(cursor-to-next-line screen:terminal-address)
(loop)
}
; print file letters as legend
(s:string-address <- new " +----------------")
(print-string screen:terminal-address s:string-address)
(cursor-to-next-line screen:terminal-address)
(s:string-address <- new " a b c d e f g h")
(print-string screen:terminal-address s:string-address)
(cursor-to-next-line screen:terminal-address)
])
;; data structure: move
(and-record move [
from:integer-integer-pair
to:integer-integer-pair
])
(address move-address (move))
(function read-move [
(default-space:space-address <- new space:literal 30:literal)
(stdin:channel-address <- next-input)
(from-file:integer <- read-file stdin:channel-address)
{ begin
(break-if from-file:integer)
(reply nil:literal)
}
(from-rank:integer <- read-rank stdin:channel-address)
(expect-stdin stdin:channel-address ((#\- literal)))
(to-file:integer <- read-file stdin:channel-address)
(to-rank:integer <- read-rank stdin:channel-address)
(expect-stdin stdin:channel-address ((#\newline 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)
])
; todo: assumes stdin is always at raw address 1
(function read-file [
(default-space:space-address <- new space:literal 30:literal)
(stdin:channel-address <- next-input)
(x:tagged-value stdin:channel-address/deref <- read stdin:channel-address)
;? ($print x:tagged-value) ;? 1
;? ($print (("\n" literal))) ;? 1
(a:character <- copy ((#\a literal)))
(file-base:integer <- character-to-integer a:character)
(c:character <- maybe-coerce x:tagged-value character:literal)
;? ($print (("AAA " literal))) ;? 1
;? ($print c:character) ;? 1
;? ($print (("\n" literal))) ;? 1
{ begin
(quit:boolean <- equal c:character ((#\q literal)))
(break-unless quit:boolean)
(reply nil:literal)
}
(file:integer <- character-to-integer c:character)
(file:integer <- subtract file:integer file-base:integer)
; assert('a' <= from-file <= 'h')
(above-min:boolean <- greater-or-equal file:integer 0:literal)
(assert above-min:boolean (("file too low" literal)))
(below-max:boolean <- lesser-or-equal file:integer 7:literal)
(assert below-max:boolean (("file too high" literal)))
(reply file:integer)
])
(function read-rank [
(default-space:space-address <- new space:literal 30:literal)
(stdin:channel-address <- next-input)
(x:tagged-value stdin:channel-address/deref <- read stdin:channel-address)
(c:character <- maybe-coerce x:tagged-value character:literal)
;? ($print (("BBB " literal))) ;? 1
;? ($print c:character) ;? 1
;? ($print (("\n" literal))) ;? 1
{ begin
(quit:boolean <- equal c:character ((#\q literal)))
(break-unless quit:boolean)
(reply nil:literal)
}
(rank:integer <- character-to-integer c:character)
(one:character <- copy ((#\1 literal)))
(rank-base:integer <- character-to-integer one:character)
(rank:integer <- subtract rank:integer rank-base:integer)
; assert('1' <= rank <= '8')
(above-min:boolean <- greater-or-equal rank:integer 0:literal)
(assert above-min:boolean (("rank too low" literal)))
(below-max:boolean <- lesser-or-equal rank:integer 7:literal)
(assert below-max:boolean (("rank too high" literal)))
(reply rank:integer)
])
; slurp a character and check that it matches
(function expect-stdin [
(default-space:space-address <- new space:literal 30:literal)
(stdin:channel-address <- next-input)
(x:tagged-value stdin:channel-address/deref <- read stdin:channel-address)
(c:character <- maybe-coerce x:tagged-value character:literal)
(expected:character <- next-input)
(match?:boolean <- equal c:character expected:character)
(assert match?:boolean (("expected character not found" literal)))
])
(function make-move [
(default-space:space-address <- new space: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 chessboard [
(default-space:space-address <- new space:literal 30:literal)
(initial-position:integer-array-address <- init-array ((#\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)))
(b:board-address <- init-board initial-position:integer-array-address)
(cursor-mode)
; hook up stdin
(stdin:channel-address <- init-channel 1:literal)
(fork-helper send-keys-to-stdin:fn nil:literal/globals nil:literal/limit nil:literal/keyboard stdin:channel-address)
; buffer stdin
(buffered-stdin:channel-address <- init-channel 1:literal)
(fork-helper buffer-lines:fn nil:literal/globals nil:literal/limit stdin:channel-address buffered-stdin:channel-address)
($print (("Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves." literal)))
(cursor-to-next-line nil:literal/terminal)
{ begin
(cursor-to-next-line nil:literal/terminal)
(print-board nil:literal/terminal b:board-address)
(cursor-to-next-line nil:literal/terminal)
($print (("Type in your move as <from square>-<to square>. For example: 'a2-a4'. Then press <enter>." literal)))
(cursor-to-next-line nil:literal/terminal)
($print (("Hit 'q' to exit." literal)))
(cursor-to-next-line nil:literal/terminal)
($print (("move: " literal)))
(m:move-address <- read-move buffered-stdin:channel-address)
;? (retro-mode) ;? 1
;? ($print stdin:channel-address) ;? 1
;? ($print (("\n" literal))) ;? 1
;? ($print buffered-stdin:channel-address) ;? 1
;? ($print (("\n" literal))) ;? 1
;? ($dump-memory) ;? 1
;? (cursor-mode) ;? 1
(break-unless m:move-address)
(b:board-address <- make-move b:board-address m:move-address)
(loop)
}
(retro-mode)
])
(function main [
(chessboard)
])
; todo:
; backspace, ctrl-u
|