chore(tsl): add detailed info on item parsing errors

gradle.properties

@@ -5,7 +5,7 @@ org.gradle.daemon=false
 
 mod_id=twitchspawn
 mod_group=net.programmer.igoodie
-mod_version=0.4.15
+mod_version=0.4.16
 
 minecraft_version=1.12.2
 forge_version=14.23.3.2655

src/main/java/net/programmer/igoodie/twitchspawn/tslanguage/action/ChangeAction.java

@@ -80,8 +80,10 @@ private void parseItem(List<String> itemPart) throws TSLSyntaxError {
         String randomItem = ExpressionEvaluator.replaceExpressions(this.itemRaw, expression -> {
             return ExpressionEvaluator.fromArgs(expression, randomEvent);
         });
-        if (!new ItemParser(randomItem).isValid())
-            throw new TSLSyntaxError("Invalid item text");
+        ItemParser itemParser = new ItemParser(randomItem);
+        if (!itemParser.isValid()) {
+            throw new TSLSyntaxError("Invalid item text (%s)", itemParser.getError().getMessage());
+        }
     }
 
     @Override

src/main/java/net/programmer/igoodie/twitchspawn/tslanguage/action/DropAction.java

@@ -41,8 +41,10 @@ public DropAction(List<String> words) throws TSLSyntaxError {
         String randomItem = ExpressionEvaluator.replaceExpressions(this.itemRaw, expression -> {
             return ExpressionEvaluator.fromArgs(expression, randomEvent);
         });
-        if (!new ItemParser(randomItem).isValid())
-            throw new TSLSyntaxError("Invalid item text");
+        ItemParser itemParser = new ItemParser(randomItem);
+        if (!itemParser.isValid()) {
+            throw new TSLSyntaxError("Invalid item text (%s)", itemParser.getError().getMessage());
+        }
     }
 
     @Override

src/main/java/net/programmer/igoodie/twitchspawn/util/ItemParser.java

@@ -6,6 +6,7 @@
 import net.minecraft.nbt.NBTException;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.ResourceLocation;
+import net.programmer.igoodie.twitchspawn.tslanguage.parser.TSLSyntaxError;
 
 public class ItemParser {
 
@@ -43,6 +44,19 @@ public boolean isValid() {
         return true;
     }
 
+    public TSLSyntaxError getError() {
+        if (getItem() == null)
+            return new TSLSyntaxError("Unknown item name");
+
+        try {
+            JsonToNBT.getTagFromJson(itemNbt);
+            return null;
+
+        } catch (NBTException e) {
+            return new TSLSyntaxError(e.getMessage());
+        }
+    }
+
     public ItemStack generateItemStack(int amount) {
         if (!isValid())
             throw new IllegalArgumentException("Cannot generate item stack from invalid item text");