Incomplete thoughts

[slidingtile] / sliding_tile.go

diff --git a/sliding_tile.go b/sliding_tile.go
index 32bccae239b9b0c9a1f8b989c5396c4bc527fe93..68cd4b1292f49b8a8c8f5a1c6bd7439bf5951f28 100644 (file)
--- a/sliding_tile.go
+++ b/sliding_tile.go
@@ -1,14 +1,34 @@
 package main
 
+import "flag"
 import "fmt"
 import "os"
+import "reflect"
 import "strconv"
 
+import "github.com/petar/GoLLRB/llrb"
+import "github.com/willf/bloom"
+
+var bloomsize = flag.Int("bloomsize", 2000000, "Size bloomfilter for this many states.")
+
 const HOLE = 0
-const BOARD_SIZE = 16
+const BOARD_DIM = 4
+const BOARD_SIZE = BOARD_DIM * BOARD_DIM
 
 type Space int8
 type Board [BOARD_SIZE]Space
+type Step struct {
+       board  Board
+       prev   *Step
+       length int
+}
+
+const (
+       LEFT  = -1
+       RIGHT = +1
+       UP    = -BOARD_DIM
+       DOWN  = +BOARD_DIM
+)
 
 func read_board_from_strings(in []string) (*Board, error) {
        if len(in) != BOARD_SIZE {
@@ -25,10 +45,46 @@ func read_board_from_strings(in []string) (*Board, error) {
        return &b, nil
 }
 
+func adjacent_spaces(s Space) []Space {
+       if s < 0 || s >= BOARD_SIZE {
+               panic("Invalid space")
+       }
+       var adjacent []Space
+       if s >= BOARD_DIM {
+               adjacent = append(adjacent, s+UP)
+       }
+       if s < BOARD_SIZE-BOARD_DIM {
+               adjacent = append(adjacent, s+DOWN)
+       }
+       if s%BOARD_DIM != 0 {
+               adjacent = append(adjacent, s+LEFT)
+       }
+       if s%BOARD_DIM != BOARD_DIM-1 {
+               adjacent = append(adjacent, s+RIGHT)
+       }
+       return adjacent
+}
+
+func create_successors(start *Step) {
+  for _, adj := adjacent_spaces(start.
+}
+
+func sliding_tile(start *Board) error {
+  seen := bloom.NewWithEstimates(uint(*bloomsize), 0.0001)
+  seen.Add(reflect.ValueOf(*start).Bytes())
+  return nil
+}
+
 func main() {
-       start, err := read_board_from_strings(os.Args[1:])
+  flag.Parse()
+       start, err := read_board_from_strings(flag.Args())
+       if err != nil {
+         fmt.Println(err)
+               os.Exit(1)
+       }
+       err = sliding_tile(start)
        if err != nil {
-               panic(err)
+         fmt.Println(err)
+               os.Exit(1)
        }
-       fmt.Println(start)
 }