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annotate core/src/luan/modules/BinaryLuan.java @ 404:d55e873e1f0d

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metatables now only apply to tables
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 29 Apr 2015 07:04:40 -0600
parents cbb94a7c7a9e
children abce9b0041b0
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.modules;
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3 import luan.Luan;
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4 import luan.LuanState;
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5 import luan.LuanTable;
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6 import luan.LuanFunction;
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7 import luan.LuanException;
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8 import luan.LuanMethod;
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11 public final class BinaryLuan {
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13 public static Object __index(LuanState luan,final byte[] binary,Object key) throws LuanException {
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14 LuanTable mod = (LuanTable)luan.require("luan:Binary");
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15 Object obj = mod.get(key);
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16 if( obj instanceof LuanFunction ) {
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17 final LuanFunction fn = (LuanFunction)obj;
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18 return new LuanFunction() {
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19 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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20 Object[] a = new Object[args.length+1];
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21 a[0] = binary;
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22 System.arraycopy(args,0,a,1,args.length);
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23 return fn.call(luan,a);
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24 }
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25 };
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26 }
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27 return null;
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28 }
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30 static int start(byte[] binary,int i) {
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31 int len = binary.length;
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32 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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33 }
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35 static int start(byte[] binary,Integer i,int dflt) {
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36 return i==null ? dflt : start(binary,i);
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37 }
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39 static int end(byte[] binary,int i) {
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40 int len = binary.length;
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41 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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42 }
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44 static int end(byte[] binary,Integer i,int dflt) {
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45 return i==null ? dflt : end(binary,i);
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46 }
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48 @LuanMethod public static Byte[] byte_(LuanState luan,byte[] binary,Integer i,Integer j) throws LuanException {
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49 Utils.checkNotNull(luan,binary);
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50 int start = start(binary,i,1);
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51 int end = end(binary,j,start+1);
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52 Byte[] bytes = new Byte[end-start];
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53 for( int k=0; k<bytes.length; k++ ) {
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54 bytes[k] = binary[start+k];
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55 }
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56 return bytes;
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57 }
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59 @LuanMethod public static byte[] binary(byte... bytes) {
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60 return bytes;
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61 }
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63 public static String to_string(byte[] binary) {
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64 return new String(binary);
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65 }
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67 }