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annotate src/luan/lib/IoLib.java @ 124:f537ff5e511d

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minor cleanup git-svn-id: https://luan-java.googlecode.com/svn/trunk@125 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 06 Jun 2014 03:41:04 +0000
parents d00f41edbbd6
children 0cd559a16758
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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 void load(LuanState luan) throws LuanException {
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28 luan.load("Io",LOADER);
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29 }
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31 public static final LuanFunction LOADER = new LuanFunction() {
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32 @Override public Object call(LuanState luan,Object[] args) {
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33 LuanTable module = new LuanTable();
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34 try {
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35 add( module, "file", String.class );
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36 add( module, "java_resource_to_url", String.class );
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37 add( module, "url", String.class );
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38 add( module, "java_resource", String.class );
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39 add( module, "read_console_line", String.class );
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41 LuanTable stdin = new LuanTable();
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42 stdin.put( "read_text", new LuanJavaFunction(
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43 IoLib.class.getMethod( "stdin_read_text" ), null
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44 ) );
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45 stdin.put( "read_binary", new LuanJavaFunction(
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46 IoLib.class.getMethod( "stdin_read_binary" ), null
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47 ) );
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48 stdin.put( "read_lines", new LuanJavaFunction(
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49 IoLib.class.getMethod( "stdin_read_lines" ), null
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50 ) );
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51 stdin.put( "read_blocks", new LuanJavaFunction(
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52 IoLib.class.getMethod( "stdin_read_blocks", Integer.class ), null
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53 ) );
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54 module.put( "stdin", stdin );
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55 } catch(NoSuchMethodException e) {
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56 throw new RuntimeException(e);
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57 }
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58 module.put( "stdout", textWriter(System.out) );
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59 module.put( "stderr", textWriter(System.err) );
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60 return module;
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61 }
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62 };
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64 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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65 t.put( method, new LuanJavaFunction(IoLib.class.getMethod(method,parameterTypes),null) );
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66 }
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68 public static final class LuanFile {
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69 private final File file;
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71 private LuanFile(String name) {
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72 this.file = new File(name);
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73 }
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75 public String read_text() throws IOException {
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76 return Utils.read(file);
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77 }
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79 public byte[] read_binary() throws IOException {
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80 return Utils.readAll(file);
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81 }
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83 public void write(LuanState luan,Object obj) throws LuanException, IOException {
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84 if( obj instanceof String ) {
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85 String s = (String)obj;
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86 Utils.write(file,s);
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87 return;
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88 }
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89 if( obj instanceof byte[] ) {
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90 byte[] a = (byte[])obj;
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91 Utils.writeAll(file,a);
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92 return;
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93 }
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94 throw luan.JAVA.exception( "bad argument #1 to 'write' (string or binary expected)" );
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95 }
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97 public LuanTable text_writer() throws IOException {
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98 return textWriter(new FileWriter(file));
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99 }
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101 public LuanTable binary_writer() throws IOException {
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102 return binaryWriter(new FileOutputStream(file));
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103 }
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104
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105 public LuanFunction read_lines() throws IOException {
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106 return lines(new BufferedReader(new FileReader(file)));
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107 }
116
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108
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109 public LuanFunction read_blocks(Integer blockSize) throws IOException {
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110 int n = blockSize!=null ? blockSize : Utils.bufSize;
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111 return blocks(new FileInputStream(file),n);
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112 }
115
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113 }
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114
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115 public static LuanTable file(String name) {
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116 LuanTable tbl = new LuanTable();
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117 LuanFile file = new LuanFile(name);
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118 try {
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119 tbl.put( "read_text", new LuanJavaFunction(
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120 LuanFile.class.getMethod( "read_text" ), file
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121 ) );
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122 tbl.put( "read_binary", new LuanJavaFunction(
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123 LuanFile.class.getMethod( "read_binary" ), file
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124 ) );
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125 tbl.put( "write", new LuanJavaFunction(
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126 LuanFile.class.getMethod( "write", LuanState.class, Object.class ), file
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127 ) );
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128 tbl.put( "text_writer", new LuanJavaFunction(
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129 LuanFile.class.getMethod( "text_writer" ), file
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130 ) );
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131 tbl.put( "binary_writer", new LuanJavaFunction(
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132 LuanFile.class.getMethod( "binary_writer" ), file
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133 ) );
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134 tbl.put( "read_lines", new LuanJavaFunction(
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135 LuanFile.class.getMethod( "read_lines" ), file
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136 ) );
116
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137 tbl.put( "read_blocks", new LuanJavaFunction(
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138 LuanFile.class.getMethod( "read_blocks", Integer.class ), file
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139 ) );
115
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140 } catch(NoSuchMethodException e) {
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141 throw new RuntimeException(e);
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142 }
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143 return tbl;
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144 }
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145
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146
116
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147 public static final class LuanUrl {
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148 private final URL url;
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149
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150 LuanUrl(String s) throws MalformedURLException {
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151 this.url = new URL(s);
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152 }
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153
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154 public String read_text() throws IOException {
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155 Reader in = new InputStreamReader(url.openStream());
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156 String s = Utils.readAll(in);
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157 in.close();
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158 return s;
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159 }
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160
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161 public byte[] read_binary() throws IOException {
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162 InputStream in = url.openStream();
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163 byte[] a = Utils.readAll(in);
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164 in.close();
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165 return a;
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166 }
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167
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168 public LuanFunction read_lines() throws IOException {
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169 return lines(new BufferedReader(new InputStreamReader(url.openStream())));
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170 }
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171
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172 public LuanFunction read_blocks(Integer blockSize) throws IOException {
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173 int n = blockSize!=null ? blockSize : Utils.bufSize;
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174 return blocks(url.openStream(),n);
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175 }
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176 }
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177
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178 public static LuanTable url(String s) throws MalformedURLException {
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179 LuanTable tbl = new LuanTable();
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180 LuanUrl url = new LuanUrl(s);
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181 try {
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182 tbl.put( "read_text", new LuanJavaFunction(
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183 LuanUrl.class.getMethod( "read_text" ), url
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184 ) );
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185 tbl.put( "read_binary", new LuanJavaFunction(
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186 LuanUrl.class.getMethod( "read_binary" ), url
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187 ) );
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188 tbl.put( "read_lines", new LuanJavaFunction(
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189 LuanUrl.class.getMethod( "read_lines" ), url
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190 ) );
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191 tbl.put( "read_blocks", new LuanJavaFunction(
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192 LuanUrl.class.getMethod( "read_blocks", Integer.class ), url
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193 ) );
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194 } catch(NoSuchMethodException e) {
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195 throw new RuntimeException(e);
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196 }
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197 return tbl;
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198 }
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199
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200
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201
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202 public static String stdin_read_text() throws IOException {
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203 return Utils.readAll(new InputStreamReader(System.in));
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204 }
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205
116
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206 public static byte[] stdin_read_binary() throws IOException {
115
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207 return Utils.readAll(System.in);
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208 }
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209
116
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210 public static LuanFunction stdin_read_lines() throws IOException {
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211 return lines(new BufferedReader(new InputStreamReader(System.in)));
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212 }
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213
116
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214 public static LuanFunction stdin_read_blocks(Integer blockSize) throws IOException {
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215 int n = blockSize!=null ? blockSize : Utils.bufSize;
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216 return blocks(System.in,n);
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217 }
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218
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219 public static String java_resource_to_url(String path) throws IOException {
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220 URL url = ClassLoader.getSystemResource(path);
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221 return url==null ? null : url.toString();
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222 }
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223
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224 public static LuanTable java_resource(String path) throws IOException {
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225 return url(java_resource_to_url(path));
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226 }
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227
118
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228 public static String read_console_line(String prompt) throws IOException {
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229 if( prompt==null )
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230 prompt = "> ";
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231 return System.console().readLine(prompt);
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232 }
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233
115
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234
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235 public interface LuanWriter {
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236 public void write(LuanState luan,Object... args) throws LuanException, IOException;
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237 public void close() throws IOException;
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238 }
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239
122
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240 public static LuanTable textWriter(final PrintStream out) {
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241 LuanWriter luanWriter = new LuanWriter() {
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242
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243 public void write(LuanState luan,Object... args) throws LuanException {
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244 for( Object obj : args ) {
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245 out.print( luan.JAVA.toString(obj) );
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246 }
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247 }
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248
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249 public void close() {
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250 out.close();
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251 }
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252 };
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253 return writer(luanWriter);
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254 }
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255
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256 public static LuanTable textWriter(final Writer out) {
115
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257 LuanWriter luanWriter = new LuanWriter() {
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258
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259 public void write(LuanState luan,Object... args) throws LuanException, IOException {
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260 for( Object obj : args ) {
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261 out.write( luan.JAVA.toString(obj) );
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262 }
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263 }
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264
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265 public void close() throws IOException {
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266 out.close();
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267 }
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268 };
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269 return writer(luanWriter);
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270 }
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271
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272 private static LuanTable writer(LuanWriter luanWriter) {
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273 LuanTable writer = new LuanTable();
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274 try {
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275 writer.put( "write", new LuanJavaFunction(
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276 LuanWriter.class.getMethod( "write", LuanState.class, new Object[0].getClass() ), luanWriter
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277 ) );
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278 writer.put( "close", new LuanJavaFunction(
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279 LuanWriter.class.getMethod( "close" ), luanWriter
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280 ) );
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281 } catch(NoSuchMethodException e) {
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282 throw new RuntimeException(e);
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283 }
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284 return writer;
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285 }
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286
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287
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288 public static LuanTable binaryWriter(final OutputStream out) {
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289 LuanTable writer = new LuanTable();
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290 try {
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291 writer.put( "write", new LuanJavaFunction(
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292 OutputStream.class.getMethod( "write", new byte[0].getClass() ), out
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293 ) );
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294 writer.put( "close", new LuanJavaFunction(
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295 OutputStream.class.getMethod( "close" ), out
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296 ) );
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297 } catch(NoSuchMethodException e) {
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298 throw new RuntimeException(e);
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299 }
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300 return writer;
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301 }
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302
116
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303 static LuanFunction lines(final BufferedReader in) {
115
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304 return new LuanFunction() {
116
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305 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
115
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306 try {
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307 if( args.length > 0 ) {
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308 if( args.length > 1 || !"close".equals(args[0]) )
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309 throw luan.JAVA.exception( "the only argument allowed is 'close'" );
115
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310 in.close();
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311 return null;
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312 }
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313 String rtn = in.readLine();
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314 if( rtn==null )
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315 in.close();
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316 return rtn;
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317 } catch(IOException e) {
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318 throw luan.JAVA.exception(e);
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319 }
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320 }
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321 };
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322 }
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323
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324 static LuanFunction blocks(final InputStream in,final int blockSize) {
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325 return new LuanFunction() {
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326 final byte[] a = new byte[blockSize];
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327
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328 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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329 try {
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330 if( args.length > 0 ) {
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331 if( args.length > 1 || !"close".equals(args[0]) )
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332 throw luan.JAVA.exception( "the only argument allowed is 'close'" );
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333 in.close();
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334 return null;
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335 }
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336 if( in.read(a) == -1 ) {
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337 in.close();
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338 return null;
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339 }
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340 return a;
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341 } catch(IOException e) {
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342 throw luan.JAVA.exception(e);
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343 }
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344 }
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345 };
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346 }
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347
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348 }