Examples of org.luaj.vm2.LuaString

org.luaj.vm2.LuaTable
Subclass of {@link LuaValue} for representing lua strings.
Because lua string values are more nearly sequences of bytes than sequences of characters or unicode code points, the {@link LuaString}implementation holds the string value in an internal byte array.
{@link LuaString} values are generally not mutable once constructed, so multiple {@link LuaString} values can chare a single byte array.
Currently {@link LuaString}s are pooled via a centrally managed weak table. To ensure that as many string values as possible take advantage of this, Constructors are not exposed directly. As with number, booleans, and nil, instance construction should be via {@link LuaValue#valueOf(byte[])} or similar API.
When Java Strings are used to initialize {@link LuaString} data, the UTF8 encoding is assumed. The functions {@link LuaString#lengthAsUtf8(char[]),}{ {@link LuaString#encodeToUtf8(char[],byte[],int)}, and {@link LuaString#decodeAsUtf8(byte[],int,int) are used to convert back and forth between UTF8 byte arrays and character arrays.} @see LuaValue @see LuaValue#valueOf(String) @see LuaValue#valueOf(byte[])

    public Object coerce(LuaValue value) {
      if ( value.isnil() )
        return null;
      if ( targetType == TARGET_TYPE_STRING )
        return value.tojstring();
      LuaString s = value.checkstring();
      byte[] b = new byte[s.m_length];
      s.copyInto(0, b, 0, b.length);
      return b;
    }

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   * Note that numerical codes are not necessarily portable across platforms.
   * 
   * @param args the calling args
   */
  static Varargs byte_( Varargs args ) {
    LuaString s = args.checkstring(1);
    int l = s.m_length;
    int posi = posrelat( args.optint(2,1), l );
    int pose = posrelat( args.optint(3,posi), l );
    int n,i;
    if (posi <= 0) posi = 1;
    if (pose > l) pose = l;
    if (posi > pose) return NONE;  /* empty interval; return no values */
    n = (int)(pose -  posi + 1);
    if (posi + n <= pose)  /* overflow? */
        error("string slice too long");
    LuaValue[] v = new LuaValue[n];
    for (i=0; i<n; i++)
      v[i] = valueOf(s.luaByte(posi+i-1));
    return varargsOf(v);
  }

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   * 
   * This function does not accept string values containing embedded zeros, 
   * except as arguments to the q option. 
   */
  static Varargs format( Varargs args ) {
    LuaString fmt = args.checkstring( 1 );
    final int n = fmt.length();
    Buffer result = new Buffer(n);
    int arg = 1;
    int c;
    
    for ( int i = 0; i < n; ) {
      switch ( c = fmt.luaByte( i++ ) ) {
      case '\n':
        result.append( "\n" );
        break;
      default:
        result.append( (byte) c );
        break;
      case L_ESC:
        if ( i < n ) {
          if ( ( c = fmt.luaByte( i ) ) == L_ESC ) {
            ++i;
            result.append( (byte)L_ESC );
          } else {
            arg++;
            FormatDesc fdsc = new FormatDesc(args, fmt, i );
            i += fdsc.length;
            switch ( fdsc.conversion ) {
            case 'c':
              fdsc.format( result, (byte)args.checkint( arg ) );
              break;
            case 'i':
            case 'd':
              fdsc.format( result, args.checkint( arg ) );
              break;
            case 'o':
            case 'u':
            case 'x':
            case 'X':
              fdsc.format( result, args.checklong( arg ) );
              break;
            case 'e':
            case 'E':
            case 'f':
            case 'g':
            case 'G':
              fdsc.format( result, args.checkdouble( arg ) );
              break;
            case 'q':
              addquoted( result, args.checkstring( arg ) );
              break;
            case 's': {
              LuaString s = args.checkstring( arg );
              if ( fdsc.precision == -1 && s.length() >= 100 ) {
                result.append( s );
              } else {
                fdsc.format( result, s );
              }
            }  break;

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   *
   * For this function, a '^' at the start of a pattern does not work as an anchor, 
   * as this would prevent the iteration.
   */
  static Varargs gmatch( Varargs args ) {
    LuaString src = args.checkstring( 1 );
    LuaString pat = args.checkstring( 2 );
    return new GMatchAux(args, src, pat);
  }

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   *       local t = {name="lua", version="5.1"}
   *       x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
   *       --> x="lua-5.1.tar.gz"
   */
  static Varargs gsub( Varargs args ) {
    LuaString src = args.checkstring( 1 );
    final int srclen = src.length();
    LuaString p = args.checkstring( 2 );
    LuaValue repl = args.arg( 3 );
    int max_s = args.optint( 4, srclen + 1 );
    final boolean anchor = p.length() > 0 && p.charAt( 0 ) == '^';
    
    Buffer lbuf = new Buffer( srclen );
    MatchState ms = new MatchState( args, src, p );
    
    int soffset = 0;

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   * string.rep (s, n)
   * 
   * Returns a string that is the concatenation of n copies of the string s. 
   */
  static Varargs rep( Varargs args ) {
    LuaString s = args.checkstring( 1 );
    int n = args.checkint( 2 );
    final byte[] bytes = new byte[ s.length() * n ];
    int len = s.length();
    for ( int offset = 0; offset < bytes.length; offset += len ) {
      s.copyInto( 0, bytes, offset, len );
    }
    return LuaString.valueOf( bytes );
  }

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   * string.reverse (s)
   * 
   * Returns a string that is the string s reversed. 
   */
  static LuaValue reverse( LuaValue arg ) {    
    LuaString s = arg.checkstring();
    int n = s.length();
    byte[] b = new byte[n];
    for ( int i=0, j=n-1; i<n; i++, j-- )
      b[j] = (byte) s.luaByte(i);
    return LuaString.valueOf( b );
  }

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   * returns a prefix of s with length j, and 
   *   string.sub(s, -i) 
   * returns a suffix of s with length i.
   */
  static Varargs sub( Varargs args ) {
    final LuaString s = args.checkstring( 1 );
    final int l = s.length();
    
    int start = posrelat( args.checkint( 2 ), l );
    int end = posrelat( args.optint( 3, -1 ), l );
    
    if ( start < 1 )
      start = 1;
    if ( end > l )
      end = l;
    
    if ( start <= end ) {
      return s.substring( start-1 , end );
    } else {
      return EMPTYSTRING;
    }
  }

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  /**
   * This utility method implements both string.find and string.match.
   */
  static Varargs str_find_aux( Varargs args, boolean find ) {
    LuaString s = args.checkstring( 1 );
    LuaString pat = args.checkstring( 2 );
    int init = args.optint( 3, 1 );
    
    if ( init > 0 ) {
      init = Math.min( init - 1, s.length() );
    } else if ( init < 0 ) {
      init = Math.max( 0, s.length() + init );
    }
    
    boolean fastMatch = find && ( args.arg(4).toboolean() || pat.indexOfAny( SPECIALS ) == -1 );
    
    if ( fastMatch ) {
      int result = s.indexOf( pat, init );
      if ( result != -1 ) {
        return varargsOf( valueOf(result+1), valueOf(result+pat.length()) );
      }
    } else {
      MatchState ms = new MatchState( args, s, pat );
      
      boolean anchor = false;
      int poff = 0;
      if ( pat.luaByte( 0 ) == '^' ) {
        anchor = true;
        poff = 1;
      }
      
      int soff = init;

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        try {
            this.animations = new TreeMap<String, SpriteAnimation>();
            File spriteFile = Project.getSpriteFile(animationSetId);
            LuaC.install();
            LuaTable environment = LuaValue.tableOf();


            environment.set("animation", new AnimationFunction());


            LuaFunction code = LoadState.load(new FileInputStream(spriteFile),
                spriteFile.getName(), environment);
            code.call();
        }

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