Mercurial > hg > blitz_condensed
annotate src/com/go/trove/io/UnicodeReader.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group |
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3 * ==================================================================== |
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4 * The Tea Software License, Version 1.1 |
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5 * |
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. The end-user documentation included with the redistribution, |
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21 * if any, must include the following acknowledgment: |
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22 * "This product includes software developed by the |
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23 * Walt Disney Internet Group (http://opensource.go.com/)." |
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24 * Alternately, this acknowledgment may appear in the software itself, |
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25 * if and wherever such third-party acknowledgments normally appear. |
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26 * |
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must |
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28 * not be used to endorse or promote products derived from this |
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29 * software without prior written permission. For written |
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30 * permission, please contact opensource@dig.com. |
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31 * |
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32 * 5. Products derived from this software may not be called "Tea", |
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", |
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior |
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35 * written permission of the Walt Disney Internet Group. |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS |
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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48 * ==================================================================== |
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49 * |
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50 * For more information about Tea, please see http://opensource.go.com/. |
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51 */ |
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52 |
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53 package com.go.trove.io; |
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54 |
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55 import java.io.*; |
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56 |
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57 /****************************************************************************** |
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58 * This reader handles unicode escapes in a character stream as defined by |
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59 * <i>The Java Language Specification</i>. |
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60 * |
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61 * <p>A unicode escape consists of six characters: '\' and 'u' followed by |
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62 * four hexadecimal digits. If the format of the escape is not correct, then |
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63 * the escape is unprocessed. To prevent a correctly formatted unicode escape |
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64 * from being processed, preceed it with another '\'. |
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65 * |
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66 * @author Brian S O'Neill |
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67 * @version |
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68 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 12/11/00 <!-- $--> |
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69 */ |
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70 public class UnicodeReader extends EscapeReader { |
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71 /** Just a temporary buffer for holding the four hexadecimal digits. */ |
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72 private char[] mMinibuf = new char[4]; |
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73 |
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74 private boolean mEscaped; |
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75 |
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76 /** |
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77 * A UnicodeReader needs an underlying source Reader. |
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78 * |
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79 * @param source the source PositionReader |
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80 */ |
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81 public UnicodeReader(Reader source) { |
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82 super(source, 6); |
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83 } |
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84 |
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85 public int read() throws IOException { |
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86 int c = mSource.read(); |
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87 |
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88 if (c != '\\' || !mEscapesEnabled) { |
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89 mEscaped = false; |
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90 return c; |
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91 } |
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92 |
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93 c = mSource.read(); |
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94 |
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95 // Have scanned "\\"? (two backslashes) |
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96 if (c == '\\') { |
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97 mEscaped = !mEscaped; |
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98 mSource.unread(); |
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99 return '\\'; |
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100 } |
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101 |
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102 // Have not scanned '\', 'u'? |
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103 if (c != 'u') { |
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104 mSource.unread(); |
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105 return '\\'; |
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106 } |
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107 |
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108 // At this point, have scanned '\', 'u'. |
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109 |
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110 // If previously escaped, then don't process unicode escape. |
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111 if (mEscaped) { |
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112 mEscaped = false; |
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113 mSource.unread(); |
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114 return '\\'; |
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115 } |
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116 |
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117 int len = mSource.read(mMinibuf, 0, 4); |
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118 |
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119 if (len == 4) { |
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120 try { |
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121 int val = |
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122 Integer.valueOf(new String(mMinibuf, 0, 4), 16).intValue(); |
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123 |
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124 return val; |
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125 } |
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126 catch (NumberFormatException e) { |
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127 // If the number is not a parseable as hexadecimal, then |
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128 // treat this as a bad format and do not process the |
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129 // unicode escape. |
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130 } |
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131 } |
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132 |
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133 // Unread the four hexadecimal characters and the leading 'u'. |
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134 if (len >= 0) { |
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135 mSource.unread(len + 1); |
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136 } |
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137 |
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138 return '\\'; |
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139 } |
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140 |
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141 public static void main(String[] arg) throws Exception { |
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142 Tester.test(arg); |
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143 } |
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144 |
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145 private static class Tester { |
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146 public static void test(String[] arg) throws Exception { |
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147 String str = |
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148 "This is \\" + "u0061 test.\n" + |
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149 "This is \\" + "u00612 test.\n" + |
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150 "This is \\" + "u0061" + "\\" + "u0061" + " test.\n" + |
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151 "This is \\" + "u061 test.\n" + |
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152 "This is \\\\" + "u0061 test.\n" + |
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153 "This is \\" + "a test.\n"; |
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154 |
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155 System.out.println("\nOriginal:\n"); |
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156 |
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157 Reader reader = new StringReader(str); |
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158 |
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159 int c; |
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160 while ( (c = reader.read()) >= 0 ) { |
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161 System.out.print((char)c); |
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162 } |
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163 |
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164 System.out.println("\nConverted:\n"); |
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165 |
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166 reader = new StringReader(str); |
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167 reader = new UnicodeReader(reader); |
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168 |
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169 while ( (c = reader.read()) != -1 ) { |
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170 System.out.print((char)c); |
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171 } |
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172 |
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173 System.out.println("\nUnread test 1:\n"); |
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174 |
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175 reader = new StringReader(str); |
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176 PushbackPositionReader pr = |
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177 new PushbackPositionReader(new UnicodeReader(reader), 1); |
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178 |
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179 while ( (c = pr.read()) != -1 ) { |
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180 pr.unread(); |
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181 c = pr.read(); |
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182 System.out.print((char)c); |
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183 } |
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184 |
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185 System.out.println("\nUnread test 2:\n"); |
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186 |
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187 reader = new StringReader(str); |
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188 pr = new PushbackPositionReader(new UnicodeReader(reader), 2); |
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189 |
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190 int i = 0; |
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191 while ( (c = pr.read()) != -1 ) { |
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192 if ( (i++ % 5) == 0 ) { |
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193 c = pr.read(); |
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194 pr.unread(); |
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195 pr.unread(); |
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196 c = pr.read(); |
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197 } |
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198 |
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199 System.out.print((char)c); |
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200 } |
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201 |
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202 System.out.println("\nUnread position test:\n"); |
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203 |
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204 reader = new StringReader(str); |
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205 pr = new PushbackPositionReader(new UnicodeReader(reader), 2); |
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206 |
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207 System.out.print(pr.getNextPosition() + "\t"); |
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208 i = 0; |
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209 while ( (c = pr.read()) != -1 ) { |
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210 if ( (i++ % 5) == 0 ) { |
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211 c = pr.read(); |
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212 pr.unread(); |
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213 pr.unread(); |
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214 c = pr.read(); |
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215 } |
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216 |
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217 System.out.println((char)c); |
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218 System.out.print(pr.getNextPosition() + "\t"); |
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219 } |
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220 } |
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221 } |
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222 } |