Mercurial > hg > blitz_condensed
annotate src/com/go/trove/io/SourceReader.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 * The SourceReader provides several services for reading source input. |
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59 * It calculates line numbers, position in the source file, supports two |
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60 * character pushback, extracts code from text that allows mixed code and |
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61 * plain text, and it processes unicode escape sequences that appear in |
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62 * source code. |
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63 * |
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64 * <p>Readers return -1 when the end of the stream, has been reached, and so |
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65 * does SourceReader. SourceReader will also return other special negative |
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66 * values to indicate a tag substitution. ENTER_CODE is returned to indicate |
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67 * that characters read are in source code, and ENTER_TEXT is returned to |
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68 * indicate that characters read are in plain text. The first character read |
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69 * from a SourceReader is either ENTER_CODE or ENTER_TEXT; |
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70 * |
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71 * @author Brian S O'Neill |
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72 * @version |
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73 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 4/26/01 <!-- $--> |
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74 */ |
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75 public class SourceReader extends PushbackPositionReader { |
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76 public static final int ENTER_CODE = -2; |
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77 public static final int ENTER_TEXT = -3; |
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78 |
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79 private static Reader createReader(Reader source, |
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80 String beginTag, String endTag) { |
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81 String[] tags = new String[4]; |
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82 int[] codes = new int[4]; |
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83 |
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84 int i = 0; |
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85 // Convert different kinds of line breaks into the newline character. |
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86 tags[i] = "\r\n"; codes[i++] = '\n'; |
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87 tags[i] = "\r"; codes[i++] = '\n'; |
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88 |
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89 if (beginTag != null && beginTag.length() > 0) { |
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90 tags[i] = beginTag; codes[i++] = ENTER_CODE; |
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91 } |
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92 |
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93 if (endTag != null && endTag.length() > 0) { |
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94 tags[i] = endTag; codes[i++] = ENTER_TEXT; |
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95 } |
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96 |
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97 if (i < 4) { |
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98 String[] newTags = new String[i]; |
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99 System.arraycopy(tags, 0, newTags, 0, i); |
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100 tags = newTags; |
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101 |
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102 int[] newCodes = new int[i]; |
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103 System.arraycopy(codes, 0, newCodes, 0, i); |
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104 codes = newCodes; |
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105 } |
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106 |
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107 return new UnicodeReader(new TagReader(source, tags, codes)); |
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108 } |
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109 |
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110 private UnicodeReader mUnicodeReader; |
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111 private TagReader mTagReader; |
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112 private boolean mClosed = false; |
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113 |
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114 // The current line in the source. (1..) |
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115 private int mLine = 1; |
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116 |
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117 private int mFirst; |
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118 |
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119 private String mBeginTag; |
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120 private String mEndTag; |
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121 |
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122 /** |
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123 * The begin and end tags for a SourceReader are optional. If the begin |
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124 * tag is null or has zero length, then the SourceReader starts reading |
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125 * characters as if they were source code. |
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126 * |
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127 * <p>If the end tag is null or has zero length, then a source code |
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128 * region continues to the end of the input Reader's characters. |
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129 * |
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130 * @param source the source reader |
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131 * @param beginTag tag that marks the beginning of a source code region |
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132 * @param endTag tag that marks the end of a source code region |
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133 */ |
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134 public SourceReader(Reader source, String beginTag, String endTag) { |
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135 this(source, beginTag, endTag, false); |
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136 } |
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137 |
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138 /** |
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139 * The begin and end tags for a SourceReader are optional. If the begin |
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140 * tag is null or has zero length, then the SourceReader starts reading |
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141 * characters as if they were source code. |
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142 * |
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143 * <p>If the end tag is null or has zero length, then a source code |
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144 * region continues to the end of the input Reader's characters. |
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145 * |
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146 * @param source the source reader |
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147 * @param beginTag tag that marks the beginning of a source code region |
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148 * @param endTag tag that marks the end of a source code region |
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149 * @param inCode flag that indicates if the stream is starting in code |
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150 */ |
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151 public SourceReader(Reader source, String beginTag, String endTag, |
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152 boolean inCode) { |
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153 super(createReader(source, beginTag, endTag), 2); |
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154 mUnicodeReader = (UnicodeReader)in; |
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155 mTagReader = (TagReader)mUnicodeReader.getOriginalSource(); |
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156 |
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157 boolean codeMode = ((beginTag == null || beginTag.length() == 0) || |
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158 inCode); |
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159 mFirst = (codeMode) ? ENTER_CODE : ENTER_TEXT; |
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160 |
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161 mBeginTag = beginTag; |
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162 mEndTag = endTag; |
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163 } |
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164 |
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165 public String getBeginTag() { |
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166 return mBeginTag; |
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167 } |
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168 |
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169 public String getEndTag() { |
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170 return mEndTag; |
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171 } |
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172 |
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173 /** |
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174 * All newline character patterns are are converted to \n. |
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175 */ |
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176 public int read() throws IOException { |
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177 int c; |
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178 |
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179 if (mFirst != 0) { |
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180 c = mFirst; |
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181 mFirst = 0; |
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182 } |
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183 else { |
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184 c = super.read(); |
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185 } |
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186 |
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187 if (c == '\n') { |
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188 mLine++; |
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189 } |
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190 else if (c == ENTER_CODE) { |
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191 mUnicodeReader.setEscapesEnabled(true); |
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192 } |
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193 else if (c == ENTER_TEXT) { |
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194 mUnicodeReader.setEscapesEnabled(false); |
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195 } |
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196 |
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197 return c; |
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198 } |
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199 |
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200 public int getLineNumber() { |
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201 return mLine; |
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202 } |
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203 |
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204 /** |
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205 * The position in the reader where the last read character ended. The |
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206 * position of the first character read from a Reader is zero. |
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207 * |
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208 * <p>The end position is usually the same as the start position, but |
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209 * sometimes a SourceReader may combine multiple characters into a |
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210 * single one. |
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211 * |
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212 * @return the end position where the last character was read |
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213 */ |
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214 public int getEndPosition() { |
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215 int e = getNextPosition() - 1; |
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216 return (e < getStartPosition()) ? getStartPosition() : e; |
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217 } |
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218 |
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219 public void ignoreTags(boolean ignore) { |
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220 mTagReader.setEscapesEnabled(!ignore); |
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221 } |
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222 |
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223 public boolean isClosed() { |
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224 return mClosed; |
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225 } |
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226 |
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227 public void close() throws IOException { |
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228 mClosed = true; |
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229 super.close(); |
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230 } |
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231 |
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232 protected void unreadHook(int c) { |
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233 if (c == '\n') { |
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234 mLine--; |
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235 } |
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236 else if (c == ENTER_CODE) { |
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237 mUnicodeReader.setEscapesEnabled(false); |
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238 } |
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239 else if (c == ENTER_TEXT) { |
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240 mUnicodeReader.setEscapesEnabled(true); |
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241 } |
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242 } |
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243 |
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244 /** |
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245 * Simple test program |
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246 */ |
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247 public static void main(String[] arg) throws Exception { |
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248 Tester.test(arg); |
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249 } |
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250 |
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251 private static class Tester { |
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252 public static void test(String[] arg) throws Exception { |
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253 String str = |
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254 "This is \\" + "u0061 test.\n" + |
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255 "This is \\" + "u00612 test.\n" + |
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256 "This is \\" + "u0061" + "\\" + "u0061" + " test.\n" + |
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257 "This is \\" + "u061 test.\n" + |
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258 "This is \\\\" + "u0061 test.\n" + |
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259 "This is \\" + "a test.\n" + |
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260 "Plain text <%put code here%> plain text.\n" + |
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261 "Plain text <\\" + "u0025put code here%> plain text.\n" + |
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262 "Plain text <%put code here\\" + "u0025> plain text.\n"; |
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263 |
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264 Reader reader; |
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265 |
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266 if (arg.length > 0) { |
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267 reader = new java.io.FileReader(arg[0]); |
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268 } |
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269 else { |
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270 System.out.println("\nOriginal:\n"); |
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271 |
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272 reader = new StringReader(str); |
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273 |
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274 int c; |
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275 while ( (c = reader.read()) != -1 ) { |
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276 System.out.print((char)c); |
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277 } |
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278 } |
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279 |
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280 System.out.println("\nTest 1:\n"); |
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281 |
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282 if (arg.length > 0) { |
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283 reader = new java.io.FileReader(arg[0]); |
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284 } |
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285 else { |
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286 reader = new StringReader(str); |
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287 } |
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288 |
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289 SourceReader sr = new SourceReader(reader, "<%", "%>"); |
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290 |
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291 int c; |
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292 while ( (c = sr.read()) != -1 ) { |
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293 System.out.print((char)c); |
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294 System.out.print("\t" + c); |
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295 System.out.print("\t" + sr.getLineNumber()); |
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296 System.out.print("\t" + sr.getStartPosition()); |
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297 System.out.println("\t" + sr.getEndPosition()); |
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298 } |
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299 |
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300 System.out.println("\nTest 2:\n"); |
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301 if (arg.length > 0) { |
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302 reader = new java.io.FileReader(arg[0]); |
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303 } |
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304 else { |
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305 reader = new StringReader(str); |
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306 } |
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307 |
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308 sr = new SourceReader(reader, null, null); |
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309 |
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310 while ( (c = sr.read()) != -1 ) { |
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311 System.out.print((char)c); |
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312 System.out.print("\t" + c); |
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313 System.out.print("\t" + sr.getLineNumber()); |
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314 System.out.print("\t" + sr.getStartPosition()); |
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315 System.out.println("\t" + sr.getEndPosition()); |
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316 } |
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317 } |
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318 } |
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319 } |