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annotate core/src/luan/modules/PickleCon.java @ 189:fb3993431f76

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@190 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 26 Jun 2014 16:44:42 +0000
parents 3dcb0f9bee82
children 75750ceb45ee
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rev   line source
167
4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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2
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3 import java.io.OutputStream;
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4 import java.io.BufferedOutputStream;
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5 import java.io.DataInputStream;
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6 import java.io.DataOutputStream;
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7 import java.io.IOException;
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8 import java.util.Set;
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9 import java.util.IdentityHashMap;
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10 import java.util.Collections;
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11 import java.util.Map;
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12 import java.util.List;
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13 import java.util.ArrayList;
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14 import luan.Luan;
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15 import luan.LuanTable;
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16 import luan.LuanState;
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17 import luan.LuanFunction;
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18 import luan.LuanJavaFunction;
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19 import luan.LuanException;
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20
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21
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22 public final class PickleCon {
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23 final LuanState luan;
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24 private final DataInputStream in;
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25 private final LuanFunction _read_binary;
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26 final LuanTable ioModule;
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27 private final DataOutputStream out;
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28 private final List<byte[]> binaries = new ArrayList<byte[]>();
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29 String src;
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30 private final LuanTable env = new LuanTable();
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31
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32 PickleCon(LuanState luan,DataInputStream in,DataOutputStream out) {
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33 this.in = in;
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34 this.luan = luan;
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35 try {
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36 this._read_binary = new LuanJavaFunction(
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37 PickleCon.class.getMethod( "_read_binary", Integer.TYPE ), this
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38 );
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39 } catch(NoSuchMethodException e) {
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40 throw new RuntimeException(e);
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41 }
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42 this.ioModule = (LuanTable)luan.loaded().get("Io");
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43 env.put("Io",ioModule);
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44
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45 this.out = out;
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46 }
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47
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48 public byte[] _read_binary(int size) throws IOException, LuanException {
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49 byte[] a = new byte[size];
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50 int i = 0;
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51 while( i < size ) {
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52 int n = in.read(a,i,size-i);
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53 if( n == -1 )
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54 throw luan.exception( "end of stream" );
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55 i += n;
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56 }
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57 return a;
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58 }
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59
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60 public Object read() throws IOException, LuanException {
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61 ioModule.put("_read_binary",_read_binary);
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62 try {
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63 src = in.readUTF();
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64 LuanFunction fn = BasicLuan.load(luan,src,"pickle-reader",env,false);
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65 return luan.call(fn);
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66 } finally {
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67 ioModule.put("_binaries",null);
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68 ioModule.put("_read_binary",null);
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69 }
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70 }
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71
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72 public String pickle(Object obj) throws LuanException {
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73 if( obj == null )
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74 return "nil";
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75 if( obj instanceof Boolean )
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76 return Luan.toString((Boolean)obj);
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77 if( obj instanceof Number )
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78 return Luan.toString((Number)obj);
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79 if( obj instanceof String )
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80 return "\"" + Luan.stringEncode((String)obj) + "\"";
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81 if( obj instanceof LuanTable )
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82 return pickle( (LuanTable)obj, Collections.newSetFromMap(new IdentityHashMap<LuanTable,Boolean>()) );
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83 if( obj instanceof byte[] ) {
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84 byte[] a = (byte[])obj;
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85 binaries.add(a);
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86 return "Io._binaries[" + binaries.size() + "]";
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87 }
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88 throw luan.exception( "invalid type: " + obj.getClass() );
129
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89 }
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90
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91 private String pickle(Object obj,Set<LuanTable> set) throws LuanException {
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92 return obj instanceof LuanTable ? pickle((LuanTable)obj,set) : pickle(obj);
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93 }
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94
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95 private String pickle(LuanTable tbl,Set<LuanTable> set) throws LuanException {
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96 if( !set.add(tbl) ) {
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97 throw luan.exception( "circular reference in table" );
129
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98 }
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99 StringBuilder sb = new StringBuilder();
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100 sb.append( "{" );
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101 for( Map.Entry<Object,Object> entry : tbl ) {
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102 sb.append( "[" );
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103 sb.append( pickle(entry.getKey(),set) );
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104 sb.append( "]=" );
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105 sb.append( pickle(entry.getValue(),set) );
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106 sb.append( ", " );
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107 }
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108 sb.append( "}" );
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109 return sb.toString();
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110 }
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111
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112 public void write(Object... args) throws LuanException, IOException {
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113 StringBuilder sb = new StringBuilder();
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114 if( !binaries.isEmpty() ) {
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115 sb.append( "Io._binaries = {}\n" );
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116 for( byte[] a : binaries ) {
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117 sb.append( "Io._binaries[#Io._binaries+1] = Io._read_binary(" + a.length + ")\n" );
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118 }
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119 }
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120 for( Object obj : args ) {
130
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121 sb.append( luan.toString(obj) );
129
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122 }
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123 out.writeUTF( sb.toString() );
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124 for( byte[] a : binaries ) {
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125 out.write(a);
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126 }
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127 out.flush();
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128 binaries.clear();
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129 }
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130
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131 public void close() throws IOException {
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132 in.close();
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133 out.close();
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134 }
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135 }