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annotate core/src/luan/modules/BinaryLuan.java @ 510:2da0bcb979b5

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better error messages
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 22 May 2015 02:28:15 -0600
parents e3b0846dc2ef
children 473e456444ff
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4c0131c2b650 merge luan/lib into modules
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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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9 import luan.LuanBit;
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ebe9db183eb7 rename *Lib.java to *Luan.java
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12 public final class BinaryLuan {
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13
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14 public static Object __index(LuanBit bit,final byte[] binary,Object key) throws LuanException {
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15 LuanState luan = bit.luan;
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16 LuanTable mod = (LuanTable)PackageLuan.require(luan,"luan:Binary");
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17 Object obj = mod.get(luan,key);
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18 if( obj instanceof LuanFunction ) {
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19 final LuanFunction fn = (LuanFunction)obj;
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20 return new LuanFunction() {
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21 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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22 Object[] a = new Object[args.length+1];
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23 a[0] = binary;
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24 System.arraycopy(args,0,a,1,args.length);
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25 return fn.call(luan,a);
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26 }
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27 };
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28 }
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29 if( bit.el != null )
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30 throw bit.exception( "invalid index for binary in '"+bit.el.text()+"'" ) ;
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31 else
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32 throw bit.exception( "invalid index for binary") ;
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33 }
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35 static int start(byte[] binary,int i) {
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36 int len = binary.length;
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37 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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38 }
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40 static int start(byte[] binary,Integer i,int dflt) {
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41 return i==null ? dflt : start(binary,i);
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42 }
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44 static int end(byte[] binary,int i) {
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45 int len = binary.length;
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46 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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47 }
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49 static int end(byte[] binary,Integer i,int dflt) {
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50 return i==null ? dflt : end(binary,i);
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51 }
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53 @LuanMethod public static Byte[] byte_(LuanState luan,byte[] binary,Integer i,Integer j) throws LuanException {
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54 Utils.checkNotNull(luan,binary);
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55 int start = start(binary,i,1);
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56 int end = end(binary,j,start+1);
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57 Byte[] bytes = new Byte[end-start];
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58 for( int k=0; k<bytes.length; k++ ) {
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59 bytes[k] = binary[start+k];
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60 }
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61 return bytes;
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62 }
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64 @LuanMethod public static byte[] binary(byte... bytes) {
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65 return bytes;
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66 }
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68 public static String to_string(byte[] binary) {
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69 return new String(binary);
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70 }
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72 }