lua parser and vendor count fix

pom.xml

@@ -111,6 +111,14 @@
 			<version>25.0-jre</version>
 		</dependency>
 
+		<!-- lua parser -->
+
+		<dependency>
+			<groupId>org.luaj</groupId>
+			<artifactId>luaj-jse</artifactId>
+			<version>3.0.1</version>
+		</dependency>
+
 		<!-- xml bind -->
 
 		<dependency>

src/main/java/io/rudin/minetest/tileserver/listener/FancyVendBlockListener.java

@@ -7,7 +7,9 @@ import io.rudin.minetest.tileserver.parser.Inventory;
 import io.rudin.minetest.tileserver.parser.Item;
 import io.rudin.minetest.tileserver.parser.Metadata;
 import io.rudin.minetest.tileserver.service.EventBus;
+import io.rudin.minetest.tileserver.util.LuaParser;
 import org.jooq.DSLContext;
+import org.luaj.vm2.LuaTable;
 
 import javax.inject.Inject;
 import java.util.Map;
@@ -78,14 +80,17 @@ main={size=90}
         Inventory give = inv.get("given_item");
         Inventory main = inv.get("main");
 
+        String settings = map.get("settings");
+        LuaTable settingsTable = LuaParser.parseMap(settings);
+
         if (pay.items.isEmpty() || give.items.isEmpty())
             return;
 
         String in_item = pay.items.get(0).name;
-        int in_count = Math.max(1, pay.items.get(0).count);
+        int in_count = Math.max(1, settingsTable.get("input_item_qty").toint());
 
         String out_item = give.items.get(0).name;
-        int out_count = Math.max(1, give.items.get(0).count);
+        int out_count = Math.max(1, settingsTable.get("output_item_qty").toint());
 
         if (in_item == null || out_item == null)
             //Nothing to sell yet

src/main/java/io/rudin/minetest/tileserver/util/LuaParser.java

@@ -0,0 +1,35 @@
+package io.rudin.minetest.tileserver.util;
+
+import org.luaj.vm2.LuaTable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+import java.util.HashMap;
+import java.util.Map;
+
+public class LuaParser {
+
+    private static ScriptEngineManager mgr = new ScriptEngineManager();
+    private static ScriptEngine engine = mgr.getEngineByName("luaj");
+
+    private static final Logger logger = LoggerFactory.getLogger(LuaParser.class);
+
+    public static LuaTable parseMap(String str) {
+        try {
+            Object result = engine.eval(str);
+
+            if (result instanceof LuaTable) {
+                return (LuaTable) result;
+            }
+
+            return null;
+
+        } catch (ScriptException e){
+            throw new IllegalArgumentException("parseMap", e);
+        }
+    }
+
+}

src/test/java/io/rudin/minetest/tileserver/LuaParserTest.java

@@ -0,0 +1,31 @@
+package io.rudin.minetest.tileserver;
+
+import io.rudin.minetest.tileserver.util.LuaParser;
+import org.junit.Assert;
+import org.junit.Test;
+import org.luaj.vm2.LuaTable;
+
+import javax.script.ScriptException;
+import java.util.Map;
+
+public class LuaParserTest {
+
+
+    static final String MAP_STR = "return {[\"admin_vendor\"] = true, [\"depositor\"] = false, [\"split_incoming_stacks\"] = false,\n" +
+            " [\"output_item\"] = \"currency:minegeld\", [\"quit\"] = true, [\"accept_worn_input\"] = true, [\"digiline_channel\"] = \"\", [\"output_item_qty\"] = 1,\n" +
+            " [\"auto_sort\"] = false, [\"input_item\"] = \"default:coal_lump\", [\"currency_eject\"] = false, [\"accept_output_only\"] = false, [\"co_sellers\"] = \"\",\n" +
+            " [\"accept_worn_output\"] = true, [\"banned_buyers\"] = \"\", [\"input_item_qty\"] = 1, [\"inactive_force\"] = false}";
+
+    @Test
+    public void testMap() throws ScriptException {
+
+        LuaTable map = LuaParser.parseMap(MAP_STR);
+
+        Assert.assertNotNull(map);
+        Assert.assertEquals(true, map.get("admin_vendor").checkboolean());
+        Assert.assertEquals("currency:minegeld", map.get("output_item").tojstring());
+        Assert.assertEquals(1, map.get("output_item_qty").toint());
+
+    }
+
+}