Examples of org.luaj.vm2.LuaValue

org.luaj.vm2.LuaValue
Base class for all concrete lua type values.
Establishes base implementations for all the operations on lua types. This allows Java clients to deal essentially with one type for all Java values, namely {@link LuaValue}.
Constructors are provided as static methods for common Java types, such as {@link LuaValue#valueOf(int)} or {@link LuaValue#valueOf(String)} to allow for instance pooling.
Constants are defined for the lua values {@link #NIL}, {@link #TRUE}, and {@link #FALSE}. A constant {@link #NONE} is defined which is a {@link Varargs} list having no values.
Operations are performed on values directly via their Java methods. For example, the following code divides two numbers:
```
  {@code LuaValue a = LuaValue.valueOf( 5 ); LuaValue b = LuaValue.valueOf( 4 ); LuaValue c = a.div(b);} 
```
Note that in this example, c will be a {@link LuaDouble}, but would be a {@link LuaInteger} if the value of a were changed to 8, say. In general the value of c in practice will vary depending on both the types and values of a and b as well as any metatable/metatag processing that occurs.
Field access and function calls are similar, with common overloads to simplify Java usage:
```
  {@code LuaValue globals = JsePlatform.standardGlobals(); LuaValue sqrt = globals.get("math").get("sqrt"); LuaValue print = globals.get("print"); LuaValue d = sqrt.call( a ); print.call( LuaValue.valueOf("sqrt(5):"), a );} 
```
To supply variable arguments or get multiple return values, use {@link invoke(Varargs)} or {@link invokemethod(LuaValue, Varargs)} methods:
```
  {@code LuaValue modf = globals.get("math").get("modf"); Varargs r = modf.invoke( d ); print.call( r.arg(1), r.arg(2) );} 
```
To load and run a script, {@link LoadState} is used:
```
  {@code LoadState.load( new FileInputStream("main.lua"), "main.lua", globals ).call();} 
```
although {@code require} could also be used:
```
  {@code globals.get("require").call(LuaValue.valueOf("main"));} 
```
For this to work the file must be in the current directory, or in the class path, dependening on the platform. See {@link JsePlatform} and {@link JmePlatform} for details.
In general a {@link LuaError} may be thrown on any operation when the types supplied to any operation are illegal from a lua perspective. Examples could be attempting to concatenate a NIL value, or attempting arithmetic on values that are not number.
There are several methods for preinitializing tables, such as:
- {@link #listOf(LuaValue[])} for unnamed elements
- {@link #tableOf(LuaValue[])} for named elements
- {@link #tableOf(LuaValue[],LuaValue[],Varargs)} for mixtures
Predefined constants exist for the standard lua type constants {@link TNIL}, {@link TBOOLEAN}, {@link TLIGHTUSERDATA}, {@link TNUMBER}, {@link TSTRING}, {@link TTABLE}, {@link TFUNCTION}, {@link TUSERDATA}, {@link TTHREAD}, and extended lua type constants {@link TINT}, {@link TNONE}, {@link TVALUE}
Predefined constants exist for all strings used as metatags: {@link INDEX}, {@link NEWINDEX}, {@link CALL}, {@link MODE}, {@link METATABLE}, {@link ADD}, {@link SUB}, {@link DIV}, {@link MUL}, {@link POW}, {@link MOD}, {@link UNM}, {@link LEN}, {@link EQ}, {@link LT}, {@link LE}, {@link TOSTRING}, and {@link CONCAT}. @see JsePlatform @see JmePlatform @see LoadState @see Varargs

      "  end,\n" +
      "} )\n";
    Varargs chunk = _G.get("loadstring").call(LuaValue.valueOf(script));
    if ( ! chunk.arg1().toboolean() )
      fail( chunk.arg(2).toString() );
    LuaValue result = chunk.arg1().call();
    Object u = result.touserdata();
    VarArgsInterface v = (VarArgsInterface) u;
    assertEquals( "foo", v.varargsMethod("foo") );
    assertEquals( "foo-bar", v.varargsMethod("foo", "bar") );
    assertEquals( "foo-bar-etc", v.varargsMethod("foo", "bar", "etc") );
    assertEquals( "foo-0-nil-nil", v.arrayargsMethod("foo", new String[0]) );

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    if ( ! chunk.arg1().toboolean() )
      fail( chunk.arg(2).toString() );
    Varargs results = chunk.arg1().invoke();
    int nresults = results.narg();
    assertEquals( 2, nresults );
    LuaValue b = results.arg(1);
    LuaValue c = results.arg(2);
    String sb = b.tojstring();
    String sc = c.tojstring();
    assertEquals( "set("+typename+") "+value, sb );
    assertEquals( "setr("+typename+") "+value, sc );
  }

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  private static final int [] samehash = { 0, 1, -1, 2, -2, 4, 8, 16, 32, Integer.MAX_VALUE, Integer.MIN_VALUE };
  private static final double [] diffhash = { .5, 1, 1.5, 1, .5, 1.5, 1.25, 2.5 };
  
  public void testDoubleHashCode() {
    for ( int i=0; i<samehash.length; i++ ) {
      LuaValue j = LuaInteger.valueOf(samehash[i]);
      LuaValue d = LuaDouble.valueOf(samehash[i]);
      int hj = j.hashCode();
      int hd = d.hashCode();
      assertEquals(hj, hd);
    }
    for ( int i=0; i<diffhash.length; i+=2 ) {
      LuaValue c = LuaValue.valueOf(diffhash[i+0]);
      LuaValue d = LuaValue.valueOf(diffhash[i+1]);
      int hc = c.hashCode();
      int hd = d.hashCode();
      assertTrue("hash codes are same: "+hc,hc!=hd);
    }
  }

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      // create an environment to run in
      LuaTable _G = JsePlatform.standardGlobals();
      
      // compile into a chunk, or load as a class
      LuaValue chunk;
      if ( ! (args.length>0 && args[0].equals("nocompile")) ) {
        InputStream is =  new ByteArrayInputStream( script.getBytes() );
        chunk = LuaJC.getInstance().load(is, "script", _G);
      } else {
        chunk = (LuaValue) Class.forName("script").newInstance();
      }
      chunk.setfenv(_G);
  
      // call with arguments
      LuaValue[] vargs = new LuaValue[args.length];
      for ( int i=0; i<args.length; i++ )
        vargs[i] = LuaValue.valueOf(args[i]);
      Varargs cargs = LuaValue.varargsOf(vargs);
      Varargs v = chunk.invoke(cargs);
      
      // print the result
      for ( int i=1; i<=v.narg(); i++ )
        System.out.println("result["+i+"]: "+v.arg(i));
    } catch ( Throwable e ) {

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  void dumpConstants(final Prototype f) throws IOException {
    final LuaValue[] k = f.k;
    int i, n = k.length;
    dumpInt(n);
    for (i = 0; i < n; i++) {
      final LuaValue o = k[i];
      switch ( o.type() ) {
      case LuaValue.TNIL:
        writer.write(LuaValue.TNIL);
        break;
      case LuaValue.TBOOLEAN:
        writer.write(LuaValue.TBOOLEAN);
        dumpChar(o.toboolean() ? 1 : 0);
        break;
      case LuaValue.TNUMBER:
        switch (NUMBER_FORMAT) {
        case NUMBER_FORMAT_FLOATS_OR_DOUBLES:
          writer.write(LuaValue.TNUMBER);
          dumpDouble(o.todouble());
          break;
        case NUMBER_FORMAT_INTS_ONLY:
          if ( ! ALLOW_INTEGER_CASTING && ! o.isint() )
            throw new java.lang.IllegalArgumentException("not an integer: "+o);
          writer.write(LuaValue.TNUMBER);
          dumpInt(o.toint());
          break;
        case NUMBER_FORMAT_NUM_PATCH_INT32:
          if ( o.isint() ) {
            writer.write(LuaValue.TINT);
            dumpInt(o.toint());
          } else {
            writer.write(LuaValue.TNUMBER);
            dumpDouble(o.todouble());
          }
          break;
        default:
          throw new IllegalArgumentException("number format not supported: "+NUMBER_FORMAT);
        }

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  }


  private Varargs ioread(File f, Varargs args) throws IOException {
    int i,n=args.narg();
    LuaValue[] v = new LuaValue[n];
    LuaValue ai,vi;
    LuaString fmt;
    for ( i=0; i<n; ) {
      item: switch ( (ai = args.arg(i+1)).type() ) {
        case LuaValue.TNUMBER:
          vi = freadbytes(f,ai.toint());
          break item;
        case LuaValue.TSTRING:
          fmt = ai.checkstring();
          if ( fmt.m_length == 2 && fmt.m_bytes[fmt.m_offset] == '*' ) {
            switch ( fmt.m_bytes[fmt.m_offset+1] ) {
            case 'n': vi = freadnumber(f); break item;
            case 'l': vi = freadline(f); break item;
            case 'a': vi = freadall(f); break item;

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      assertEquals( 0, t.length() );
      assertEquals( i+1, t.keyCount() );
    }
    assertEquals( capacities[keys.length], t.getHashLength() );
    for ( int i = 0; i < keys.length; ++i ) {
      LuaValue vi = LuaString.valueOf( "Test Value! "+i );
      assertEquals( vi, t.get( keys[i] ) );
      assertEquals( vi, t.get( LuaString.valueOf(keys[i]) ) );
      assertEquals( vi, t.rawget( keys[i] ) );
      assertEquals( vi, t.rawget( keys[i] ) );
    }


    // replace with new values
    for ( int i = 0; i < keys.length; ++i ) {
      t.set( keys[i], LuaString.valueOf( "Replacement Value! "+i ) );
      assertEquals( 0, t.length() );
      assertEquals( keys.length, t.keyCount() );
      assertEquals( capacities[keys.length], t.getHashLength() );
    }
    for ( int i = 0; i < keys.length; ++i ) {
      LuaValue vi = LuaString.valueOf( "Replacement Value! "+i );
      assertEquals( vi, t.get( keys[i] ) );
    }


    // remove
    for ( int i = 0; i < keys.length; ++i ) {

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    }
  }
  public void testUniqueFactoryCoercible() {
    JavaClass c = JavaClass.forClass(B.class);
    assertEquals( JavaClass.class, c.getClass() );
    LuaValue constr = c.get("new");
    assertEquals( JavaConstructor.class, constr.getClass() );
    LuaValue v = constr.call(NUMS);
    Object b = v.touserdata();
    assertEquals( B.class, b.getClass() );
    assertEquals( 123, ((B)b).m_int_field );
    Object b0 = constr.call().touserdata();
    assertEquals( B.class, b0.getClass() );
    assertEquals( 0, ((B)b0).m_int_field );

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    assertEquals( B.class, b0.getClass() );
    assertEquals( 0, ((B)b0).m_int_field );
  }
  public void testUniqueFactoryUncoercible() {
    JavaClass f = JavaClass.forClass(B.class);
    LuaValue constr = f.get("new");
    assertEquals( JavaConstructor.class, constr.getClass() );
    try { 
      LuaValue v = constr.call(LuaValue.userdataOf(new Object()));
      Object b = v.touserdata();
      // fail( "did not throw lua error as expected" );
      assertEquals( 0, ((B)b).m_int_field );
    } catch ( LuaError e ) {
    }
  }

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    } catch ( LuaError e ) {
    }
  }
  public void testOverloadedFactoryCoercible() {
    JavaClass f = JavaClass.forClass(C.class);
    LuaValue constr = f.get("new");
    assertEquals( JavaConstructor.Overload.class, constr.getClass() );
    Object c = constr.call().touserdata();
    Object ci = constr.call(LuaValue.valueOf(123)).touserdata();
    Object cs = constr.call(LuaValue.valueOf("abc")).touserdata();
    Object csi = constr.call( LuaValue.valueOf("def"), LuaValue.valueOf(456) ).touserdata();
    assertEquals( C.class, c.getClass() );
    assertEquals( C.class, ci.getClass() );
    assertEquals( C.class, cs.getClass() );
    assertEquals( C.class, csi.getClass() );
    assertEquals( null,  ((C)c).m_string_field );

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