minetest worledit .we format export

- harcoded generation of lua content of .we export
- export something, but not yet correct ( walls are points ... )

java/org/artisanlogiciel/games/minetest/Node.java

@@ -1,4 +1,31 @@
 package org.artisanlogiciel.games.minetest;
 
 public class Node {
+    int x;
+    int y;
+    int z;
+    String material;
+
+    public Node(int x, int y, int z, String material) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.material = material;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public int getZ() {
+        return z;
+    }
+
+    public String getMaterial() {
+        return material;
+    }
 }

java/org/artisanlogiciel/games/minetest/WorlEditGenerator.java

@@ -0,0 +1,64 @@
+package org.artisanlogiciel.games.minetest;
+
+public class WorlEditGenerator
+{
+
+    Node refNode;
+    StringBuilder luaNode;
+    boolean start = true;
+
+    public WorlEditGenerator(StringBuilder luaNode, Node refNode) {
+        this.luaNode = luaNode;
+        start = true;
+        this.refNode = refNode;
+    }
+
+    private void addIntMember(String name, int value)
+    {
+        addSeparator();
+        addMember(name);
+        luaNode.append(value);
+    }
+
+    private void addStringMember( String name, String value)
+    {
+        addSeparator();
+        addMember(name);
+        luaNode.append('"').append(value).append('"');
+    }
+
+    private void addMember(String name) {
+        luaNode.append("[\"").append(name).append("\"]=");
+    }
+
+    private void addSeparator() {
+        if ( ! start)
+        {
+            luaNode.append(",");
+        }
+        start = false;
+    }
+
+    public void writeStart()
+    {
+        luaNode.append("5.return {");
+    }
+    public void writeNode(Node node)
+    {
+        addSeparator();
+        luaNode.append("{");
+        start=true;
+        addIntMember("x", node.getX() - refNode.getX());
+        addIntMember("y", node.getY() - refNode.getY());
+        addIntMember("z", node.getZ() - refNode.getZ());
+        addStringMember("name",node.getMaterial());
+        luaNode.append("}");
+        start=false;
+    }
+
+    public void writeEnd()
+    {
+        luaNode.append("}");
+    }
+
+}