Add BlockPoweredRail.java from mc-dev for diff visibility.

src/main/java/net/minecraft/server/BlockPoweredRail.java

@@ -0,0 +1,132 @@
+package net.minecraft.server;
+
+public class BlockPoweredRail extends BlockMinecartTrackAbstract {
+    protected BlockPoweredRail() {
+        super(true);
+    }
+
+    protected boolean a(World world, int i, int j, int k, int l, boolean flag, int i1) {
+        if (i1 >= 8) {
+            return false;
+        } else {
+            int j1 = l & 0x7;
+            boolean flag1 = true;
+
+            switch (j1) {
+            case 0:
+                if (flag) {
+                    ++k;
+                } else {
+                    --k;
+                }
+                break;
+
+            case 1:
+                if (flag) {
+                    --i;
+                } else {
+                    ++i;
+                }
+                break;
+
+            case 2:
+                if (flag) {
+                    i--;
+                } else {
+                    ++i;
+                    ++j;
+                    flag1 = false;
+                }
+
+                j1 = 1;
+                break;
+
+            case 3:
+                if (flag) {
+                    --i;
+                    ++j;
+                    flag1 = false;
+                } else {
+                    ++i;
+                }
+
+                j1 = 1;
+                break;
+
+            case 4:
+                if (flag) {
+                    ++k;
+                } else {
+                    --k;
+                    ++j;
+                    flag1 = false;
+                }
+
+                j1 = 0;
+                break;
+
+            case 5:
+                if (flag) {
+                    ++k;
+                    ++j;
+                    flag1 = false;
+                } else {
+                    --k;
+                }
+
+                j1 = 0;
+            }
+
+            return this.a(world, i, j, k, flag, i1, j1) ? true : flag1 && this.a(world, i, j - 1, k, flag, i1, j1);
+        }
+    }
+
+    protected boolean a(World world, int i, int j, int k, boolean flag, int l, int i1) {
+        Block block = world.getType(i, j, k);
+
+        if (block == this) {
+            int j1 = world.getData(i, j, k);
+            int k1 = j1 & 0x7;
+
+            if (i1 == 1 && (k1 == 0 || k1 == 4 || k1 == 5)) {
+                return false;
+            }
+
+            if (i1 == 0 && (k1 == 1 || k1 == 2 || k1 == 3)) {
+                return false;
+            }
+
+            if ((j1 & 0x8) != 0) {
+                if (world.isBlockIndirectlyPowered(i, j, k)) {
+                    return true;
+                }
+
+                return this.a(world, i, j, k, j1, flag, l + 1);
+            }
+        }
+
+        return false;
+    }
+
+    protected void a(World world, int i, int j, int k, int l, int i1, Block block) {
+        boolean flag = world.isBlockIndirectlyPowered(i, j, k);
+
+        flag = flag || this.a(world, i, j, k, l, true, 0) || this.a(world, i, j, k, l, false, 0);
+        boolean flag1 = false;
+
+        if (flag && (l & 0x8) == 0) {
+            world.setData(i, j, k, i1 | 0x8, 3);
+            flag1 = true;
+        } else if (!flag && (l & 0x8) != 0) {
+            world.setData(i, j, k, i1, 3);
+            flag1 = true;
+        }
+
+        if (flag1) {
+            world.applyPhysics(i, j - 1, k, this);
+            if (i1 == 2 || i1 == 3 || i1 == 4 || i1 == 5) {
+                world.applyPhysics(i, j + 1, k, this);
+            }
+        }
+    }
+}