4 files changed, 137 insertions, 0 deletions

diff --git a/src/solvers/coord/common.h b/src/solvers/coord/common.h
index c512b33..d000ce9 100644
--- a/src/solvers/coord/common.h
+++ b/src/solvers/coord/common.h
@@ -160,6 +160,12 @@ solution_lastqt_cw(const solution_moves_t s[static 1])
 }
 
 STATIC bool
+solution_always_valid(const solution_moves_t s[static 1])
+{
+        return true;
+}
+
+STATIC bool
 coord_can_switch(
         const coord_t coord[static 1],
         const unsigned char *data,
diff --git a/src/solvers/coord/coord.h b/src/solvers/coord/coord.h
index da93439..7716078 100644
--- a/src/solvers/coord/coord.h
+++ b/src/solvers/coord/coord.h
@@ -3,6 +3,7 @@
 #include "eo.h"
 #include "dr.h"
 #include "dreo.h"
+#include "drslice.h"
 #include "list.h"
 #include "utils.h"
 #include "gendata.h"
diff --git a/src/solvers/coord/drslice.h b/src/solvers/coord/drslice.h
new file mode 100644
index 0000000..63aaa88
--- /dev/null
+++ b/src/solvers/coord/drslice.h
@@ -0,0 +1,129 @@
+#define CLASSES_CP_16 2768
+
+STATIC uint64_t coordinate_cp_coord(cube_t);
+STATIC cube_t coordinate_cp_cube(uint64_t);
+STATIC uint64_t coordinate_epud_coord(cube_t);
+STATIC cube_t coordinate_epud_cube(uint64_t);
+STATIC cube_t coordinate_drslice_merge(cube_t, cube_t);
+
+STATIC uint64_t coordinate_drslice_coord(cube_t, const unsigned char *);
+STATIC cube_t coordinate_drslice_cube(uint64_t, const unsigned char *);
+STATIC bool coordinate_drslice_isnasty(uint64_t, const unsigned char *);
+STATIC size_t coordinate_drslice_gendata(unsigned char *);
+
+STATIC bool is_drslice_solvable(cube_t);
+
+STATIC coord_t coordinate_drslice = {
+        .name = "DRSLICE",
+        .coord = &coordinate_drslice_coord,
+        .cube = &coordinate_drslice_cube,
+        .isnasty = &coordinate_drslice_isnasty,
+        .gendata = coordinate_drslice_gendata,
+        .max = CLASSES_CP_16 * FACT_8,
+        .trans_mask = TM_UDFIX,
+        .moves_mask = MM18_DR,
+        .axistrans = {
+                [AXIS_UD] = TRANS_UFr,
+                [AXIS_RL] = TRANS_RFr,
+                [AXIS_FB] = TRANS_FDr,
+        },
+        .is_admissible = &solution_always_valid,
+        .is_solvable = &is_drslice_solvable,
+        .pruning_distribution = {
+                /* TODO: copied from nissy-classic, to be verified */
+                [0] = 1,
+                [1] = 3,
+                [2] = 10,
+                [3] = 52,
+                [4] = 285,
+                [5] = 1318,
+                [6] = 5671,
+                [7] = 26502,
+                [8] = 115467,
+                [9] = 470846,
+                [10] = 1853056,
+                [11] = 6535823,
+                [12] = 18349792,
+                [13] = 32843350,
+                [14] = 34118883,
+                [15] = 0, /* TODO: unknown, why does nissy-classic not have
+                                   have this value? */
+        },
+        .pruning_max = 15, /* TODO - either 14 or 15 */
+        .sym = {
+                .classes = CLASSES_CP_16,
+                .max = FACT_8,
+                .coord = &coordinate_cp_coord,
+                .cube = &coordinate_cp_cube,
+                .max2 = FACT_8,
+                .coord2 = &coordinate_epud_coord,
+                .cube2 = &coordinate_epud_cube,
+                .merge = &coordinate_drslice_merge,
+        },
+};
+
+STATIC uint64_t
+coordinate_cp_coord(cube_t c)
+{
+        return coord_cp(c);
+}
+
+STATIC cube_t
+coordinate_cp_cube(uint64_t i)
+{
+        return invcoord_cp(i);
+}
+
+STATIC uint64_t
+coordinate_epud_coord(cube_t c)
+{
+        return coord_epud(c);
+}
+
+STATIC cube_t
+coordinate_epud_cube(uint64_t i)
+{
+        return invcoord_epud(i);
+}
+
+STATIC cube_t
+coordinate_drslice_merge(cube_t c1, cube_t c2)
+{
+        cube_t merged;
+
+        merged = c1;
+        copy_edges(&merged, c2);
+
+        return merged;
+}
+
+STATIC uint64_t
+coordinate_drslice_coord(cube_t cube, const unsigned char *data)
+{
+        return coord_coord_generic(&coordinate_drslice, cube, data);
+}
+
+STATIC cube_t
+coordinate_drslice_cube(uint64_t i, const unsigned char *data)
+{
+        return coord_cube_generic(&coordinate_drslice, i, data);
+}
+
+STATIC bool
+coordinate_drslice_isnasty(uint64_t i, const unsigned char *data)
+{
+        return coord_isnasty_generic(&coordinate_drslice, i, data);
+}
+
+STATIC size_t
+coordinate_drslice_gendata(unsigned char *data)
+{
+        return coord_gendata_generic(&coordinate_drslice, data);
+}
+
+STATIC bool
+is_drslice_solvable(cube_t cube) {
+        return coord_eo(cube) == 0 &&
+               coord_eo(transform_edges(cube, TRANS_URr)) == 0 &&
+               coord_co(cube) == 0;
+}
diff --git a/src/solvers/coord/list.h b/src/solvers/coord/list.h
index 9409bb6..3badc8f 100644
--- a/src/solvers/coord/list.h
+++ b/src/solvers/coord/list.h
@@ -2,5 +2,6 @@ coord_t *all_coordinates[] = {
         &coordinate_eo,
         &coordinate_dr,
         &coordinate_dreo,
+        &coordinate_drslice,
         NULL
 };