Examples of LuaString

org.luaj.vm2.LuaString
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[])

Examples of org.luaj.vm2.LuaString

          BaseLib.loadStream( baselib.STDIN, "stdin" ):
          BaseLib.loadFile( args.checkjstring(1) );
      }
      case 6: // "loadstring", // ( string [,chunkname] ) -> chunk | nil, msg
      {
        LuaString script = args.checkstring(1);
        String chunkname = args.optjstring(2, "string");
        return BaseLib.loadStream(script.toInputStream(),chunkname);
      }
      case 7: // "pcall", // (f, arg1, ...) -> status, result1, ...
      {
        LuaValue func = args.checkvalue(1);
        LuaThread.onCall(this);
        try {
          return pcall(func,args.subargs(2),null);
        } finally {
          LuaThread.onReturn();
        }
      }
      case 8: // "xpcall", // (f, err) -> result1, ...        
      {
        LuaThread.onCall(this);
        try {
          return pcall(args.arg1(),NONE,args.checkvalue(2));
        } finally {
          LuaThread.onReturn();
        }
      }
      case 9: // "print", // (...) -> void
      {
        LuaValue tostring = LuaThread.getGlobals().get("tostring"); 
        for ( int i=1, n=args.narg(); i<=n; i++ ) {
          if ( i>1 ) baselib.STDOUT.write( '\t' );
          LuaString s = tostring.call( args.arg(i) ).strvalue();
          int z = s.indexOf((byte)0, 0);
          baselib.STDOUT.write( s.m_bytes, s.m_offset, z>=0? z: s.m_length );
        }
        baselib.STDOUT.println();
        return NONE;
      }

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Examples of org.luaj.vm2.LuaString

   * 
   * This function may receive optional options after the module name, where
   * each option is a function to be applied over the module.
   */
  public Varargs module(Varargs args) {
    LuaString modname = args.checkstring(1);
    int n = args.narg();
    LuaValue value = LOADED.get(modname);
    LuaValue module;
    if ( ! value.istable() ) { /* not found? */

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Examples of org.luaj.vm2.LuaString

    int b, e=(-1);
    do {
      e = fname.indexOf(_DOT, b=e+1 );
      if ( e < 0 )
        e = fname.m_length;
      LuaString key = fname.substring(b, e);
      LuaValue val = table.rawget(key);
      if ( val.isnil() ) { /* no such field? */
        LuaTable field = new LuaTable(); /* new table for field */
        table.set(key, field);
        table = field;

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Examples of org.luaj.vm2.LuaString

   * 
   * If there is any error loading or running the module, or if it cannot find any loader for 
   * the module, then require signals an error.
   */  
  public LuaValue require( LuaValue arg ) {
    LuaString name = arg.checkstring();
    LuaValue loaded = LOADED.get(name);
    if ( loaded.toboolean() ) {
      if ( loaded == _SENTINEL )
        error("loop or previous error loading module '"+name+"'");
      return loaded;

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Examples of org.luaj.vm2.LuaString

    args.checkstring(1);
    return varargsOf(NIL, valueOf("dynamic libraries not enabled"), valueOf("absent"));
  }


  LuaValue loader_preload( Varargs args ) {
    LuaString name = args.checkstring(1);
    LuaValue preload = PACKAGE.get(_PRELOAD).checktable();
    LuaValue val = preload.get(name);
    return val.isnil()? 
      valueOf("\n\tno field package.preload['"+name+"']"):
      val;

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Examples of org.luaj.vm2.LuaString

    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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Examples of org.luaj.vm2.LuaString

   * 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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Examples of org.luaj.vm2.LuaString

   * 
   * 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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Examples of org.luaj.vm2.LuaString

   *
   * 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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Examples of org.luaj.vm2.LuaString

   *       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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