annotate src/luan/lib/IoLib.java @ 115:eacf6ce1b47d

add IoLib git-svn-id: https://luan-java.googlecode.com/svn/trunk@116 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 29 May 2014 09:26:44 +0000
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children 1ff1c32417eb
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115
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1 package luan.lib;
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2
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3 import java.io.OutputStream;
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4 import java.io.PrintStream;
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5 import java.io.Reader;
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6 import java.io.Writer;
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7 import java.io.FileReader;
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8 import java.io.FileWriter;
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9 import java.io.BufferedReader;
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10 import java.io.File;
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11 import java.io.FileOutputStream;
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12 import java.io.InputStreamReader;
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13 import java.io.IOException;
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14 import luan.LuanState;
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15 import luan.LuanTable;
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16 import luan.LuanFunction;
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17 import luan.LuanJavaFunction;
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18 import luan.LuanException;
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20
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21 public final class IoLib {
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23 public static final String NAME = "Io";
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24
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25 public static final LuanFunction LOADER = new LuanFunction() {
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26 @Override public Object call(LuanState luan,Object[] args) {
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27 LuanTable module = new LuanTable();
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28 try {
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29 add( module, "file", String.class );
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30
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31 LuanTable stdin = new LuanTable();
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32 stdin.put( "read_text", new LuanJavaFunction(
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33 IoLib.class.getMethod( "stdin_read_text" ), null
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34 ) );
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35 stdin.put( "read_binary", new LuanJavaFunction(
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36 IoLib.class.getMethod( "stdin_read_binary" ), null
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37 ) );
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38 stdin.put( "read_lines", new LuanJavaFunction(
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39 IoLib.class.getMethod( "stdin_read_lines" ), null
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40 ) );
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41 module.put( "stdin", stdin );
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42 } catch(NoSuchMethodException e) {
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43 throw new RuntimeException(e);
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44 }
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45 module.put( "stdout", writer(System.out) );
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46 module.put( "stderr", writer(System.err) );
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47 return module;
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48 }
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49 };
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50
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51 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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52 t.put( method, new LuanJavaFunction(IoLib.class.getMethod(method,parameterTypes),null) );
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53 }
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54
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55 public static final class LuanFile {
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56 private final File file;
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57
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58 private LuanFile(String name) {
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59 this.file = new File(name);
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60 }
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61
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62 public String read_text() throws IOException {
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63 return Utils.read(file);
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64 }
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65
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66 public byte[] read_binary() throws IOException {
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67 return Utils.readAll(file);
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68 }
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69
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70 public void write(LuanState luan,Object obj) throws LuanException, IOException {
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71 if( obj instanceof String ) {
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72 String s = (String)obj;
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73 Utils.write(file,s);
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74 return;
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75 }
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76 if( obj instanceof byte[] ) {
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77 byte[] a = (byte[])obj;
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78 Utils.writeAll(file,a);
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79 return;
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80 }
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81 throw luan.JAVA.exception( "bad argument #1 to 'write' (string or binary expected)" );
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82 }
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83
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84 public LuanTable text_writer() throws IOException {
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85 return writer(new FileWriter(file));
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86 }
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87
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88 public LuanTable binary_writer() throws IOException {
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89 return binaryWriter(new FileOutputStream(file));
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90 }
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91
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92 public LuanFunction read_lines() throws IOException {
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93 return lines(new BufferedReader(new FileReader(file)));
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94 }
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95 }
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96
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97 public static LuanTable file(String name) {
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98 LuanTable tbl = new LuanTable();
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99 LuanFile file = new LuanFile(name);
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100 try {
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101 tbl.put( "read_text", new LuanJavaFunction(
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102 LuanFile.class.getMethod( "read_text" ), file
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103 ) );
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104 tbl.put( "read_binary", new LuanJavaFunction(
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105 LuanFile.class.getMethod( "read_binary" ), file
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106 ) );
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107 tbl.put( "write", new LuanJavaFunction(
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108 LuanFile.class.getMethod( "write", LuanState.class, Object.class ), file
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109 ) );
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110 tbl.put( "text_writer", new LuanJavaFunction(
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111 LuanFile.class.getMethod( "text_writer" ), file
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112 ) );
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113 tbl.put( "binary_writer", new LuanJavaFunction(
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114 LuanFile.class.getMethod( "binary_writer" ), file
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115 ) );
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116 tbl.put( "read_lines", new LuanJavaFunction(
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117 LuanFile.class.getMethod( "read_lines" ), file
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118 ) );
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119 } catch(NoSuchMethodException e) {
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120 throw new RuntimeException(e);
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121 }
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122 return tbl;
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123 }
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124
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125
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126 public String stdin_read_text() throws IOException {
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127 return Utils.readAll(new InputStreamReader(System.in));
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128 }
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129
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130 public byte[] stdin_read_binary() throws IOException {
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131 return Utils.readAll(System.in);
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132 }
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133
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134 public LuanFunction stdin_read_lines() throws IOException {
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135 return lines(new BufferedReader(new InputStreamReader(System.in)));
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136 }
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137
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138
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139 public interface LuanWriter {
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140 public void write(LuanState luan,Object... args) throws LuanException, IOException;
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141 public void close() throws IOException;
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142 }
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143
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144 public static LuanTable writer(final PrintStream out) {
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145 LuanWriter luanWriter = new LuanWriter() {
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146
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147 public void write(LuanState luan,Object... args) throws LuanException {
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148 for( Object obj : args ) {
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149 out.print( luan.JAVA.toString(obj) );
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150 }
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151 }
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152
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153 public void close() {
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154 out.close();
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155 }
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156 };
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157 return writer(luanWriter);
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158 }
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159
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160 public static LuanTable writer(final Writer out) {
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161 LuanWriter luanWriter = new LuanWriter() {
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162
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163 public void write(LuanState luan,Object... args) throws LuanException, IOException {
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164 for( Object obj : args ) {
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165 out.write( luan.JAVA.toString(obj) );
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166 }
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167 }
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168
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169 public void close() throws IOException {
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170 out.close();
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171 }
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172 };
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173 return writer(luanWriter);
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174 }
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175
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176 private static LuanTable writer(LuanWriter luanWriter) {
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177 LuanTable writer = new LuanTable();
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178 try {
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179 writer.put( "write", new LuanJavaFunction(
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180 LuanWriter.class.getMethod( "write", LuanState.class, new Object[0].getClass() ), luanWriter
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181 ) );
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182 writer.put( "close", new LuanJavaFunction(
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183 LuanWriter.class.getMethod( "close" ), luanWriter
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184 ) );
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185 } catch(NoSuchMethodException e) {
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186 throw new RuntimeException(e);
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187 }
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188 return writer;
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189 }
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190
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191
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192 public static LuanTable binaryWriter(final OutputStream out) {
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193 LuanTable writer = new LuanTable();
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194 try {
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195 writer.put( "write", new LuanJavaFunction(
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196 OutputStream.class.getMethod( "write", new byte[0].getClass() ), out
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197 ) );
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198 writer.put( "close", new LuanJavaFunction(
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199 OutputStream.class.getMethod( "close" ), out
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200 ) );
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201 } catch(NoSuchMethodException e) {
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202 throw new RuntimeException(e);
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203 }
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204 return writer;
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205 }
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206
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207 public static LuanFunction lines(final BufferedReader in) {
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208 return new LuanFunction() {
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209 public Object call(LuanState luan,Object[] args) throws LuanException {
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210 try {
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211 if( args.length==1 && "close".equals(args[0]) ) {
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212 in.close();
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213 return null;
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214 }
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215 String rtn = in.readLine();
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216 if( rtn==null )
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217 in.close();
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218 return rtn;
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219 } catch(IOException e) {
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220 throw luan.JAVA.exception(e);
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221 }
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222 }
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223 };
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224 }
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225
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226 }