diff --git a/java/org/artisanlogiciel/games/maze/persist/MazePersistWorldEdit.java b/java/org/artisanlogiciel/games/maze/persist/MazePersistWorldEdit.java
index 1ce638d..2bc2c9a 100644
--- a/java/org/artisanlogiciel/games/maze/persist/MazePersistWorldEdit.java
+++ b/java/org/artisanlogiciel/games/maze/persist/MazePersistWorldEdit.java
@@ -2,15 +2,17 @@ package org.artisanlogiciel.games.maze.persist;
 
 import org.artisanlogiciel.games.maze.Brick;
 import org.artisanlogiciel.games.maze.LabyModel;
+import org.artisanlogiciel.games.minetest.Material;
 import org.artisanlogiciel.games.minetest.Node;
 import org.artisanlogiciel.games.minetest.WorlEditGenerator;
 import java.io.*;
 
+import static org.artisanlogiciel.games.minetest.Material.GRASS_MATERIAL;
+
 public class MazePersistWorldEdit {
 
     private LabyModel model;
     private WorlEditGenerator generator;
-    private static final String GRASS_MATERIAL = "default:dirt_with_grass";
 
     public MazePersistWorldEdit(LabyModel model) {
         this.model = model;
@@ -24,6 +26,12 @@ public class MazePersistWorldEdit {
         }
     }
 
+    private Node newNode(int x, int y, String material)
+    {
+        // x,y,z => x,z,y in minetest
+        return new Node(x,0, y, Material.getMaterialByName(material));
+    }
+
     void addWalls(int pX, int pY) {
         short walls = model.getWalls(pX, pY);
         short wdrawn = 0;
@@ -36,14 +44,14 @@ public class MazePersistWorldEdit {
 
         String material = GRASS_MATERIAL;
 
-        int x = ox + (int) (pX * w);
-        int y = oy + (int) (pY * h);
+        int x = ox + (pX * w);
+        int y = oy + (pY * h);
 
         // copied from drawing, where order did matter, might not be the case here...
         //if ((pY == 0) && LabyModel.isFlagSet(walls, Brick.UP)) {
         if (LabyModel.isFlagSet(walls, Brick.UP)) {
             for ( int dx = 0; dx < w; dx++) {
-                addNode(new Node(x + dx, y, z, material));
+                addNode(newNode(x + dx, y,material));
             }
             wdrawn |= Brick.UP;
         }
@@ -66,7 +74,7 @@ public class MazePersistWorldEdit {
         //if ((pX == 0) && LabyModel.isFlagSet(walls, Brick.LEFT)) {
         if (LabyModel.isFlagSet(walls, Brick.LEFT)) {
             for (int dy = 0; dy < h; dy ++) {
-                addNode(new Node(x, y + dy, z, material));
+                addNode(newNode(x, y + dy, material));
             }
             wdrawn |= Brick.LEFT;
         }
@@ -77,7 +85,7 @@ public class MazePersistWorldEdit {
         // WIP using WorldEditGenerator
         if ((pFormat == null) || (pFormat.equals("we"))) {
 
-            Node refNode = new Node(0,0,0,"default:dirt_with_grass");
+            Node refNode = new Node(0,0,0);
             StringBuilder builder = new StringBuilder();
             generator = new WorlEditGenerator(builder,refNode);
             generator.writeStart();
diff --git a/java/org/artisanlogiciel/games/minetest/Material.java b/java/org/artisanlogiciel/games/minetest/Material.java
new file mode 100644
index 0000000..429aaf8
--- /dev/null
+++ b/java/org/artisanlogiciel/games/minetest/Material.java
@@ -0,0 +1,24 @@
+package org.artisanlogiciel.games.minetest;
+
+public class Material {
+
+    public static final String GRASS_MATERIAL = "default:dirt_with_grass";
+
+    public static Material DEFAULT = new Material(GRASS_MATERIAL);
+
+    private String name;
+
+    public Material(String name) {
+        this.name = name;
+    }
+
+    public static Material getMaterialByName(String name)
+    {
+        return DEFAULT;
+    }
+
+    @Override
+    public String toString() {
+        return "name";
+    }
+}
diff --git a/java/org/artisanlogiciel/games/minetest/Node.java b/java/org/artisanlogiciel/games/minetest/Node.java
index d1e8bb1..75b5b09 100644
--- a/java/org/artisanlogiciel/games/minetest/Node.java
+++ b/java/org/artisanlogiciel/games/minetest/Node.java
@@ -4,15 +4,22 @@ public class Node {
     int x;
     int y;
     int z;
-    String material;
+    Material material;
 
-    public Node(int x, int y, int z, String material) {
+    public Node(int x, int y, int z, Material material) {
         this.x = x;
         this.y = y;
         this.z = z;
         this.material = material;
     }
 
+    public Node(int x, int y, int z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.material = Material.DEFAULT;
+    }
+
     public int getX() {
         return x;
     }
@@ -25,7 +32,7 @@ public class Node {
         return z;
     }
 
-    public String getMaterial() {
+    public Material getMaterial() {
         return material;
     }
 }
diff --git a/java/org/artisanlogiciel/games/minetest/WorlEditGenerator.java b/java/org/artisanlogiciel/games/minetest/WorlEditGenerator.java
index 550a11c..30efbc5 100644
--- a/java/org/artisanlogiciel/games/minetest/WorlEditGenerator.java
+++ b/java/org/artisanlogiciel/games/minetest/WorlEditGenerator.java
@@ -51,7 +51,7 @@ public class WorlEditGenerator
         addIntMember("x", node.getX() - refNode.getX());
         addIntMember("y", node.getY() - refNode.getY());
         addIntMember("z", node.getZ() - refNode.getZ());
-        addStringMember("name",node.getMaterial());
+        addStringMember("name",node.getMaterial().toString() );
         luaNode.append("}");
         start=false;
     }
diff --git a/java/org/artisanlogiciel/lua/CharProvider.java b/java/org/artisanlogiciel/lua/CharProvider.java
new file mode 100644
index 0000000..98bdc6f
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/CharProvider.java
@@ -0,0 +1,32 @@
+package org.artisanlogiciel.lua;
+
+public class CharProvider {
+
+    String input;
+    int current;
+
+    public CharProvider(String input) {
+        this.input = input;
+        current = 0;
+    }
+
+    public char getNextchar()
+    {
+        int i = current;
+        if ( input.length() > current) {
+            current++;
+            return input.charAt(i);
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    public void pushBackChar(char c)
+    {
+        System.out.print('*');
+        current--;
+    }
+
+}
diff --git a/java/org/artisanlogiciel/lua/LuaNumber.java b/java/org/artisanlogiciel/lua/LuaNumber.java
new file mode 100644
index 0000000..44d46f6
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/LuaNumber.java
@@ -0,0 +1,17 @@
+package org.artisanlogiciel.lua;
+
+public class LuaNumber
+extends LuaObject {
+
+    int number;
+
+    LuaNumber(int number)
+    {
+        this.number = number;
+    }
+
+    @Override
+    public String toString() {
+        return "" + number ;
+    }
+}
diff --git a/java/org/artisanlogiciel/lua/LuaObject.java b/java/org/artisanlogiciel/lua/LuaObject.java
new file mode 100644
index 0000000..40ab3de
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/LuaObject.java
@@ -0,0 +1,4 @@
+package org.artisanlogiciel.lua;
+
+public class LuaObject {
+}
diff --git a/java/org/artisanlogiciel/lua/LuaSequence.java b/java/org/artisanlogiciel/lua/LuaSequence.java
new file mode 100644
index 0000000..b4236b6
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/LuaSequence.java
@@ -0,0 +1,43 @@
+package org.artisanlogiciel.lua;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LuaSequence
+extends  LuaObject{
+    List<LuaObject> items;
+
+    public LuaSequence()
+    {
+        items = new ArrayList<>();
+    }
+
+    void addObject(LuaObject object)
+    {
+        if ( object == null )
+        {
+            System.err.println("adding null tuple");
+        }
+        items.add(object);
+
+    }
+
+    @Override
+    public String toString()
+    {
+        StringBuffer buffer = new StringBuffer();
+        buffer.append('{');
+        if (items.size() > 0) {
+            buffer.append(items.get(0).toString());
+            if (items.size() > 1) {
+                for (int i = 1; i < items.size(); i ++)
+                {
+                    buffer.append(',');
+                    buffer.append(items.get(i).toString());
+                }
+            }
+        }
+        buffer.append('}');
+        return buffer.toString();
+    }
+}
diff --git a/java/org/artisanlogiciel/lua/LuaString.java b/java/org/artisanlogiciel/lua/LuaString.java
new file mode 100644
index 0000000..3fda12c
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/LuaString.java
@@ -0,0 +1,17 @@
+package org.artisanlogiciel.lua;
+
+public class LuaString
+    extends LuaObject
+{
+    String string;
+
+    public LuaString(StringBuffer stringBuffer)
+    {
+        string = stringBuffer.toString();
+    }
+
+    @Override
+    public String toString() {
+        return '"' + string + '"' ;
+    }
+}
diff --git a/java/org/artisanlogiciel/lua/LuaTuple.java b/java/org/artisanlogiciel/lua/LuaTuple.java
new file mode 100644
index 0000000..c884826
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/LuaTuple.java
@@ -0,0 +1,32 @@
+package org.artisanlogiciel.lua;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class LuaTuple
+    extends  LuaObject
+{
+    List<LuaObject> items;
+
+
+    public LuaTuple() {
+        this.items = new ArrayList<>(2);
+    }
+
+    public LuaObject addItem(LuaObject item)
+    {
+        items.add(item);
+        return item;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer buffer  = new StringBuffer();
+        buffer.append('[');
+        buffer.append(items.get(0).toString());
+        buffer.append("]");
+        buffer.append('=');
+        buffer.append(items.get(1).toString());
+        return buffer.toString();
+    }
+}
diff --git a/java/org/artisanlogiciel/lua/Parser.java b/java/org/artisanlogiciel/lua/Parser.java
new file mode 100644
index 0000000..d1a1f5c
--- /dev/null
+++ b/java/org/artisanlogiciel/lua/Parser.java
@@ -0,0 +1,230 @@
+package org.artisanlogiciel.lua;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Parser {
+
+    LuaTuple currentTuple = null;
+    List<String> errors = null;
+    LuaSequence currentSequence = null;
+    LuaObject lastObject = null;
+    CharProvider provider;
+
+    public Parser(CharProvider provider) {
+        this.provider = provider;
+    }
+
+    Parser(Parser parent)
+    {
+        this.provider = parent.provider;
+    }
+
+    void startSequence()
+    {
+        currentSequence = new LuaSequence();
+    }
+
+    char getNextchar()
+    {
+        char c = provider.getNextchar();
+        System.out.print(c);
+        return c;
+    }
+
+    void pushBackChar(char c)
+    {
+        provider.pushBackChar(c);
+    }
+
+    LuaString parseString()
+    {
+        char c = 0;
+        StringBuffer buffer = new StringBuffer();
+        while ( (c = getNextchar()) != 0 )
+        {
+            switch (c)
+            {
+                case '"':
+                    return new LuaString(buffer);
+                default:
+                    buffer.append(c);
+                    // addChar
+            }
+        }
+        return new LuaString(buffer);
+    }
+
+    private void error(char c, String info)
+    {
+        pushBackChar(c);
+        if ( errors == null)
+        {
+            errors = new ArrayList();
+        }
+        System.err.println(info);
+        errors.add(info);
+    }
+
+    LuaObject parseKey()
+    {
+        LuaString string = null;
+        char c = 0;
+        while ( (c = getNextchar()) != 0 )
+        {
+            switch (c)
+            {
+                case '"':
+                    if ( string == null ) {
+                        string = parseString();
+                    }
+                    else
+                    {
+                        error(c,"unexepected second string for a key");
+                    }
+                    break;
+                case ']':
+                    return string;
+                default:
+                    error(c,"unexpected at end of a '[' key");
+                    // error...
+            }
+        }
+
+        return string;
+    }
+
+    LuaSequence parseSequence()
+    {
+        Parser subparser = new Parser(this);
+        subparser.startSequence();
+        subparser.parse();
+
+        return subparser.currentSequence;
+    }
+
+    LuaNumber parseNumber(char c)
+    {
+        int number = ( c - '0' );
+        while ( (c = getNextchar()) != 0 ) {
+            switch (c) {
+                case '0':
+                case '1':
+                case '2':
+                case '3':
+                case '4':
+                case '5':
+                case '6':
+                case '7':
+                case '8':
+                case '9':
+                    number = number * 10 + ( c - '0' );
+                    break;
+                default:
+                    pushBackChar(c);
+                    return new LuaNumber(number);
+            }
+        }
+        return new LuaNumber(number);
+    }
+
+    LuaObject parse()
+    {
+        char c = 0;
+        while ( ((c = getNextchar()) != 0 ) && ( errors == null ))
+        {
+            switch (c)
+            {
+                case '"':
+                    LuaString string = parseString();
+                    lastObject = string;
+                    if ( currentSequence == null )
+                    {
+                        return string;
+                    }
+                    break ;
+                case '[':
+                    LuaObject key = parseKey();
+                    currentTuple = new LuaTuple();
+                    currentTuple.addItem(key);
+                    break ;
+                case ']':
+                    // error ?
+                    error(c,"unexpected end of key");
+                    break ;
+                case '=':
+                    if ( currentTuple != null)
+                    {
+                        Parser subparser = new Parser(this);
+                        // first item should be a key ...
+                        currentTuple.addItem(subparser.parse());
+                    }
+                    else
+                    {
+                        error(c,"expected left part to be a key");
+                    }
+                    lastObject = currentTuple;
+                    if ( currentSequence == null )
+                    {
+                        return currentTuple;
+                    }
+                    break ;
+                case '{':
+                    lastObject = parseSequence();
+                    break ;
+                case '}':
+                    if ( currentSequence != null ) {
+                        currentSequence.addObject(lastObject);
+                    }
+                    return currentSequence;
+                case ',':
+                    if ( currentSequence != null ) {
+                        currentSequence.addObject(lastObject);
+                        currentTuple = null;
+                    }
+                    break ;
+                case '0':
+                case '1':
+                case '2':
+                case '3':
+                case '4':
+                case '5':
+                case '6':
+                case '7':
+                case '8':
+                case '9':
+                    LuaNumber number = parseNumber(c);
+                    lastObject = number;
+                    if ( currentSequence == null )
+                    {
+                        return number;
+                    }
+                    break ;
+                default:
+                    error(c, "unexpected not a token or separator");
+            }
+        }
+        if ( currentSequence == null )
+        {
+            System.out.println("null sequence");
+        }
+        return lastObject;
+    }
+
+    public static void main(String pArgs[])
+    {
+        CharProvider reader = new CharProvider(
+                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+        );
+        Parser parser = new Parser(reader);
+        LuaObject result = parser.parse();
+        if ( result != null )
+        {
+            System.out.println(result.toString());
+        }
+        else
+        {
+            System.err.println("result null");
+        }
+    }
+}