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Source file

package tb;

import drjava.util.Tree;
import net.luaos.tb.common.Solution;
import org.luaj.vm2.Globals;
import org.luaj.vm2.LuaTable;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.compiler.LuaC;
import org.luaj.vm2.lib.jse.JsePlatform;


public class sol_lua extends Solution {
  String code;

  public sol_lua() {}

  public sol_lua(String code) {
    this.code = code;

  public void fromTree(Tree tree) {
    code = tree.getString(0);

  public Tree toTree() {
    return new Tree(this).add(code);

  public String compute(String input) {
    return callLuaSolution(createLuaEnvironment(), code, input);

  public static String callLuaSolution(LuaTable _G, String code, String input) {
    if (input != null)
      _G.set("input", input);

    // compile into a chunk, or load as a class
    InputStream is =  new ByteArrayInputStream(code.getBytes());
    LuaValue chunk = null;
    try {
      chunk = LuaC.instance.load(is, "script", _G);
    } catch (IOException e) {  // not gonna happen anyway
      throw new RuntimeException(e);

    // Check correct type (probably optional)

    // The chunk can be called with arguments as desired.
    LuaValue result =;

    return luaResultToString(result);

  public static String luaResultToString(LuaValue result) {
    return result.isnil() ? null : result.toString();

  /** If this is changed, make sure the environment is extendable (not a singleton!)
   *  Or change the caller site to make a clone first. */
  public static LuaTable createLuaEnvironment() {
    // create an environment to run in
    LuaTable _G = new LuaTable(); //JsePlatform.standardGlobals();

    Globals standardGlobals = JsePlatform.standardGlobals();
    _G.set("_G", _G);
    _G.set("print", standardGlobals.get("print"));
    _G.set("pairs", standardGlobals.get("pairs"));
    return _G;

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#308 1995 [visualize]

Snippet ID: #13
Snippet name: tb/
Eternal ID of this version: #13/1
Text MD5: d04cf96eb6c745e0fa36d638bfa7f6d6
Author: stefan
Type: Source file
Public (visible to everyone): Yes
Archived (hidden from active list): No
Source code size: 1995 bytes / 74 lines
Pitched / IR pitched: No / No
Views / Downloads: 851 / 458
Referenced in: [show references]