added block_list and block_tags to handle block tags.

docs/scarpet/api/BlocksAndWorldAccess.md

@@ -266,6 +266,16 @@ block_state(block('iron_trapdoor[half=top]'),'powered')  => false
 bool(block_state(block('iron_trapdoor[half=top]'),'powered'))  => 0
 </pre>
 
+### `block_list()`, `block_list(tag)`
+
+Returns list of all blocks. If tag is provided, returns list of blocks that belong to this block tag.
+
+### `block_tags()`, `block_tags(block)`, `block_tags(block, tag)`
+
+Without arguments, returns list of available tags, with block supplied (either by coordinates, or via block name), returns lost
+of tags the block belongs to, and if a tag is specified, returns `null` if tag is invalid, `false` if this block doesn't belong 
+to this tag, and `true` if the block belongs to the tag.
+
 ### `block_data(pos)`
 
 Return NBT string associated with specific location, or null if the block does not carry block data. Can be currently 

docs/scarpet/resources/editors/idea/2.txt

@@ -5,9 +5,11 @@ blast_resistance
 block
 block_data
 block_light
+block_list
 block_sound
 block_state
 block_tick
+block_tags
 blocks_daylight
 blocks_movement
 brightness

docs/scarpet/resources/editors/npp/scarpet.xml

@@ -53,7 +53,7 @@
                 transparent opacity blocks_daylight emitted_light light block_light sky_light see_sky brightness
                 hardness blast_resistance top loaded suffocates power ticks_randomly update block_tick random_tick in_slime_chunk
                 set without_updates
-                blocks_movement block_sound material map_colour block_state block_data poi set_poi
+                blocks_movement block_sound material map_colour block_state block_list block_tags block_data poi set_poi
                 place_item set_biome biome loaded_status generation_status inhabited_time spawn_potential chunk_tickets
                 structure_eligibility structures structure_references set_structure reset_chunk reload_chunk custom_dimension
                 add_chunk_ticket

src/main/java/carpet/script/api/WorldAccess.java

@@ -66,6 +66,7 @@ import net.minecraft.sound.SoundCategory;
 import net.minecraft.state.StateManager;
 import net.minecraft.state.property.Property;
 import net.minecraft.structure.StructureStart;
+import net.minecraft.tag.TagManager;
 import net.minecraft.util.ActionResult;
 import net.minecraft.util.Clearable;
 import net.minecraft.util.Identifier;
@@ -1018,6 +1019,44 @@ public class WorldAccess {
             return (_c, _t) -> retval;
         });
 
+        expression.addLazyFunction("block_list", -1, (c, t, lv) ->
+        {
+            if (lv.size() == 0)
+            {
+                Value ret = ListValue.wrap(Registry.BLOCK.getIds().stream().map(ValueConversions::of).collect(Collectors.toList()));
+                return (_c, _t) -> ret;
+            }
+            CarpetContext cc = (CarpetContext)c;
+            TagManager tagManager = cc.s.getMinecraftServer().getTagManager();
+            String tag = lv.get(0).evalValue(c).getString();
+            net.minecraft.tag.Tag<Block> blockTag = tagManager.getBlocks().getTag(new Identifier(tag));
+            if (blockTag == null) return LazyValue.NULL;
+            Value ret = ListValue.wrap(blockTag.values().stream().map(b -> ValueConversions.of(Registry.BLOCK.getId(b))).collect(Collectors.toList()));
+            return (_c, _t) -> ret;
+        });
+
+        expression.addLazyFunction("block_tags", -1, (c, t, lv) ->
+        {
+            CarpetContext cc = (CarpetContext)c;
+            TagManager tagManager = cc.s.getMinecraftServer().getTagManager();
+            if (lv.size() == 0)
+            {
+                Value ret = ListValue.wrap(tagManager.getBlocks().getTagIds().stream().map(ValueConversions::of).collect(Collectors.toList()));
+                return (_c, _t) -> ret;
+            }
+            BlockArgument blockLocator = BlockArgument.findIn(cc, lv, 0, true);
+            if (blockLocator.offset == lv.size())
+            {
+                Value ret = ListValue.wrap(tagManager.getBlocks().getTagsFor(blockLocator.block.getBlockState().getBlock()).stream().map(ValueConversions::of).collect(Collectors.toList()));
+                return (_c, _t) -> ret;
+            }
+            String tag = lv.get(blockLocator.offset).evalValue(c).getString();
+            net.minecraft.tag.Tag<Block> blockTag = tagManager.getBlocks().getTag(new Identifier(tag));
+            if (blockTag == null) return LazyValue.NULL;
+            return blockLocator.block.getBlockState().isIn(blockTag)?LazyValue.TRUE:LazyValue.FALSE;
+        });
+
+
         expression.addLazyFunction("biome", -1, (c, t, lv) -> {
             CarpetContext cc = (CarpetContext)c;
             BlockArgument locator = BlockArgument.findIn(cc, lv, 0);