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annotate src/luan/lib/IoLib.java @ 116:1ff1c32417eb

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more IoLib work and added init.luan git-svn-id: https://luan-java.googlecode.com/svn/trunk@117 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 30 May 2014 04:55:37 +0000
parents eacf6ce1b47d
children 735708619119
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1 package luan.lib;
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2
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3 import java.io.InputStream;
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4 import java.io.OutputStream;
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5 import java.io.PrintStream;
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6 import java.io.Reader;
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7 import java.io.Writer;
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8 import java.io.FileReader;
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9 import java.io.FileWriter;
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10 import java.io.BufferedReader;
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11 import java.io.File;
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12 import java.io.FileInputStream;
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13 import java.io.FileOutputStream;
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14 import java.io.InputStreamReader;
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15 import java.io.IOException;
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16 import java.net.URL;
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17 import java.net.MalformedURLException;
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18 import luan.LuanState;
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19 import luan.LuanTable;
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20 import luan.LuanFunction;
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21 import luan.LuanJavaFunction;
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22 import luan.LuanException;
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25 public final class IoLib {
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27 public static final String NAME = "Io";
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29 public static final LuanFunction LOADER = new LuanFunction() {
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30 @Override public Object call(LuanState luan,Object[] args) {
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31 LuanTable module = new LuanTable();
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32 try {
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33 add( module, "file", String.class );
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34 add( module, "java_resource_to_url", String.class );
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35 add( module, "url", String.class );
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36 add( module, "java_resource", String.class );
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38 LuanTable stdin = new LuanTable();
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39 stdin.put( "read_text", new LuanJavaFunction(
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40 IoLib.class.getMethod( "stdin_read_text" ), null
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41 ) );
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42 stdin.put( "read_binary", new LuanJavaFunction(
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43 IoLib.class.getMethod( "stdin_read_binary" ), null
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44 ) );
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45 stdin.put( "read_lines", new LuanJavaFunction(
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46 IoLib.class.getMethod( "stdin_read_lines" ), null
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47 ) );
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48 stdin.put( "read_blocks", new LuanJavaFunction(
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49 IoLib.class.getMethod( "stdin_read_blocks", Integer.class ), null
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50 ) );
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51 module.put( "stdin", stdin );
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52 } catch(NoSuchMethodException e) {
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53 throw new RuntimeException(e);
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54 }
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55 module.put( "stdout", writer(System.out) );
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56 module.put( "stderr", writer(System.err) );
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57 return module;
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58 }
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59 };
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61 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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62 t.put( method, new LuanJavaFunction(IoLib.class.getMethod(method,parameterTypes),null) );
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63 }
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64
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65 public static final class LuanFile {
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66 private final File file;
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68 private LuanFile(String name) {
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69 this.file = new File(name);
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70 }
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72 public String read_text() throws IOException {
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73 return Utils.read(file);
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74 }
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76 public byte[] read_binary() throws IOException {
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77 return Utils.readAll(file);
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78 }
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80 public void write(LuanState luan,Object obj) throws LuanException, IOException {
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81 if( obj instanceof String ) {
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82 String s = (String)obj;
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83 Utils.write(file,s);
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84 return;
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85 }
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86 if( obj instanceof byte[] ) {
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87 byte[] a = (byte[])obj;
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88 Utils.writeAll(file,a);
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89 return;
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90 }
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91 throw luan.JAVA.exception( "bad argument #1 to 'write' (string or binary expected)" );
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92 }
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94 public LuanTable text_writer() throws IOException {
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95 return writer(new FileWriter(file));
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96 }
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98 public LuanTable binary_writer() throws IOException {
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99 return binaryWriter(new FileOutputStream(file));
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100 }
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101
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102 public LuanFunction read_lines() throws IOException {
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103 return lines(new BufferedReader(new FileReader(file)));
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104 }
116
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105
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106 public LuanFunction read_blocks(Integer blockSize) throws IOException {
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107 int n = blockSize!=null ? blockSize : Utils.bufSize;
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108 return blocks(new FileInputStream(file),n);
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109 }
115
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110 }
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111
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112 public static LuanTable file(String name) {
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113 LuanTable tbl = new LuanTable();
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114 LuanFile file = new LuanFile(name);
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115 try {
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116 tbl.put( "read_text", new LuanJavaFunction(
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117 LuanFile.class.getMethod( "read_text" ), file
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118 ) );
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119 tbl.put( "read_binary", new LuanJavaFunction(
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120 LuanFile.class.getMethod( "read_binary" ), file
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121 ) );
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122 tbl.put( "write", new LuanJavaFunction(
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123 LuanFile.class.getMethod( "write", LuanState.class, Object.class ), file
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124 ) );
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125 tbl.put( "text_writer", new LuanJavaFunction(
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126 LuanFile.class.getMethod( "text_writer" ), file
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127 ) );
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128 tbl.put( "binary_writer", new LuanJavaFunction(
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129 LuanFile.class.getMethod( "binary_writer" ), file
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130 ) );
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131 tbl.put( "read_lines", new LuanJavaFunction(
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132 LuanFile.class.getMethod( "read_lines" ), file
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133 ) );
116
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134 tbl.put( "read_blocks", new LuanJavaFunction(
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135 LuanFile.class.getMethod( "read_blocks", Integer.class ), file
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136 ) );
115
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137 } catch(NoSuchMethodException e) {
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138 throw new RuntimeException(e);
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139 }
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140 return tbl;
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141 }
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142
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143
116
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144 public static final class LuanUrl {
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145 private final URL url;
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146
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147 LuanUrl(String s) throws MalformedURLException {
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148 this.url = new URL(s);
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149 }
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150
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151 public String read_text() throws IOException {
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152 Reader in = new InputStreamReader(url.openStream());
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153 String s = Utils.readAll(in);
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154 in.close();
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155 return s;
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156 }
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157
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158 public byte[] read_binary() throws IOException {
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159 InputStream in = url.openStream();
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160 byte[] a = Utils.readAll(in);
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161 in.close();
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162 return a;
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163 }
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164
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165 public LuanFunction read_lines() throws IOException {
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166 return lines(new BufferedReader(new InputStreamReader(url.openStream())));
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167 }
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168
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169 public LuanFunction read_blocks(Integer blockSize) throws IOException {
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170 int n = blockSize!=null ? blockSize : Utils.bufSize;
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171 return blocks(url.openStream(),n);
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172 }
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173 }
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174
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175 public static LuanTable url(String s) throws MalformedURLException {
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176 LuanTable tbl = new LuanTable();
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177 LuanUrl url = new LuanUrl(s);
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178 try {
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179 tbl.put( "read_text", new LuanJavaFunction(
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180 LuanUrl.class.getMethod( "read_text" ), url
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181 ) );
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182 tbl.put( "read_binary", new LuanJavaFunction(
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183 LuanUrl.class.getMethod( "read_binary" ), url
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184 ) );
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185 tbl.put( "read_lines", new LuanJavaFunction(
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186 LuanUrl.class.getMethod( "read_lines" ), url
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187 ) );
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188 tbl.put( "read_blocks", new LuanJavaFunction(
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189 LuanUrl.class.getMethod( "read_blocks", Integer.class ), url
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190 ) );
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191 } catch(NoSuchMethodException e) {
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192 throw new RuntimeException(e);
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193 }
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194 return tbl;
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195 }
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196
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197
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198
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199 public static String stdin_read_text() throws IOException {
115
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200 return Utils.readAll(new InputStreamReader(System.in));
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201 }
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202
116
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203 public static byte[] stdin_read_binary() throws IOException {
115
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204 return Utils.readAll(System.in);
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205 }
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206
116
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207 public static LuanFunction stdin_read_lines() throws IOException {
115
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208 return lines(new BufferedReader(new InputStreamReader(System.in)));
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209 }
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210
116
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211 public static LuanFunction stdin_read_blocks(Integer blockSize) throws IOException {
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212 int n = blockSize!=null ? blockSize : Utils.bufSize;
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213 return blocks(System.in,n);
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214 }
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215
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216 public static String java_resource_to_url(String path) throws IOException {
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217 URL url = ClassLoader.getSystemResource(path);
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218 return url==null ? null : url.toString();
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219 }
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220
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221 public static LuanTable java_resource(String path) throws IOException {
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222 return url(java_resource_to_url(path));
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223 }
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224
115
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225
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226 public interface LuanWriter {
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227 public void write(LuanState luan,Object... args) throws LuanException, IOException;
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228 public void close() throws IOException;
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229 }
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230
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231 public static LuanTable writer(final PrintStream out) {
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232 LuanWriter luanWriter = new LuanWriter() {
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233
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234 public void write(LuanState luan,Object... args) throws LuanException {
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235 for( Object obj : args ) {
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236 out.print( luan.JAVA.toString(obj) );
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237 }
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238 }
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239
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240 public void close() {
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241 out.close();
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242 }
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243 };
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244 return writer(luanWriter);
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245 }
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246
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247 public static LuanTable writer(final Writer out) {
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248 LuanWriter luanWriter = new LuanWriter() {
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249
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250 public void write(LuanState luan,Object... args) throws LuanException, IOException {
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251 for( Object obj : args ) {
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252 out.write( luan.JAVA.toString(obj) );
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253 }
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254 }
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255
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256 public void close() throws IOException {
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257 out.close();
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258 }
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259 };
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260 return writer(luanWriter);
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261 }
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262
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263 private static LuanTable writer(LuanWriter luanWriter) {
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264 LuanTable writer = new LuanTable();
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265 try {
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266 writer.put( "write", new LuanJavaFunction(
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267 LuanWriter.class.getMethod( "write", LuanState.class, new Object[0].getClass() ), luanWriter
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268 ) );
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269 writer.put( "close", new LuanJavaFunction(
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270 LuanWriter.class.getMethod( "close" ), luanWriter
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271 ) );
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272 } catch(NoSuchMethodException e) {
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273 throw new RuntimeException(e);
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274 }
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275 return writer;
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276 }
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277
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278
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279 public static LuanTable binaryWriter(final OutputStream out) {
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280 LuanTable writer = new LuanTable();
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281 try {
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282 writer.put( "write", new LuanJavaFunction(
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283 OutputStream.class.getMethod( "write", new byte[0].getClass() ), out
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284 ) );
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285 writer.put( "close", new LuanJavaFunction(
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286 OutputStream.class.getMethod( "close" ), out
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287 ) );
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288 } catch(NoSuchMethodException e) {
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289 throw new RuntimeException(e);
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290 }
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291 return writer;
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292 }
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293
116
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294 static LuanFunction lines(final BufferedReader in) {
115
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295 return new LuanFunction() {
116
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296 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
115
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297 try {
116
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298 if( args.length > 0 ) {
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299 if( args.length > 1 || !"close".equals(args[0]) )
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300 throw luan.JAVA.exception( "the only argument allowed is 'close'" );
115
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301 in.close();
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302 return null;
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303 }
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304 String rtn = in.readLine();
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305 if( rtn==null )
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306 in.close();
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307 return rtn;
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308 } catch(IOException e) {
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309 throw luan.JAVA.exception(e);
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310 }
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311 }
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312 };
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313 }
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314
116
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315 static LuanFunction blocks(final InputStream in,final int blockSize) {
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316 return new LuanFunction() {
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317 final byte[] a = new byte[blockSize];
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318
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319 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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320 try {
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321 if( args.length > 0 ) {
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322 if( args.length > 1 || !"close".equals(args[0]) )
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323 throw luan.JAVA.exception( "the only argument allowed is 'close'" );
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324 in.close();
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325 return null;
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326 }
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327 if( in.read(a) == -1 ) {
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328 in.close();
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329 return null;
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330 }
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331 return a;
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332 } catch(IOException e) {
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333 throw luan.JAVA.exception(e);
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334 }
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335 }
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336 };
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337 }
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338
115
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339 }