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annotate src/org/tmatesoft/hg/internal/KeywordFilter.java @ 113:67ae317408c9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Filter implementation for newline translation
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 02 Feb 2011 21:19:02 +0100
parents d488c7638b87
children 46291ec605a0
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@svnkit.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.FileOutputStream;
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22 import java.nio.ByteBuffer;
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23 import java.util.TreeMap;
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24
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25 import javax.swing.text.html.Option;
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26
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27 import org.tmatesoft.hg.core.Path;
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28 import org.tmatesoft.hg.repo.HgRepository;
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29
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30 /**
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class KeywordFilter implements Filter {
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36 // present implementation is stateless, however, filter use pattern shall not assume that. In fact, Factory may us that
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37 private final boolean isExpanding;
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38 private final TreeMap<String,String> keywords;
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39 private final int minBufferLen;
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40
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41 /**
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42 *
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43 * @param expand <code>true</code> to expand keywords, <code>false</code> to shrink
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44 */
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45 private KeywordFilter(boolean expand) {
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46 isExpanding = expand;
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47 keywords = new TreeMap<String,String>();
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48 keywords.put("Id", "Id");
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49 keywords.put("Revision", "Revision");
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50 keywords.put("Author", "Author");
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51 keywords.put("Date", "Date");
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52 keywords.put("LastChangedRevision", "LastChangedRevision");
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53 keywords.put("LastChangedBy", "LastChangedBy");
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54 keywords.put("LastChangedDate", "LastChangedDate");
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55 keywords.put("Source", "Source");
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56 keywords.put("Header", "Header");
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57
112
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58 int l = 0;
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59 for (String s : keywords.keySet()) {
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60 if (s.length() > l) {
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61 l = s.length();
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62 }
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63 }
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64 // FIXME later may implement #filter() not to read full kw value (just "$kw:"). However, limit of maxLen + 2 would keep valid.
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65 // for buffers less then minBufferLen, there are chances #filter() implementation would never end
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66 // (i.e. for input "$LongestKey"$
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67 minBufferLen = l + 2 + (isExpanding ? 0 : 120 /*any reasonable constant for max possible kw value length*/);
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68 }
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69
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70 /**
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71 * @param src buffer ready to be read
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72 * @return buffer ready to be read and original buffer's position modified to reflect consumed bytes. IOW, if source buffer
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73 * on return has remaining bytes, they are assumed not-read (not processed) and next chunk passed to filter is supposed to
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74 * start with them
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75 */
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76 public ByteBuffer filter(ByteBuffer src) {
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77 if (src.capacity() < minBufferLen) {
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78 throw new IllegalStateException(String.format("Need buffer of at least %d bytes to ensure filter won't hang", minBufferLen));
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79 }
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80 ByteBuffer rv = null;
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81 int keywordStart = -1;
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82 int x = src.position();
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83 while (x < src.limit()) {
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84 if (keywordStart == -1) {
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85 int i = indexOf(src, '$', x, false);
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86 if (i == -1) {
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87 if (rv == null) {
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88 return src;
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89 } else {
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90 copySlice(src, x, src.limit(), rv);
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91 rv.flip();
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92 src.position(src.limit());
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93 return rv;
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94 }
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95 }
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96 keywordStart = i;
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97 // fall-through
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98 }
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99 if (keywordStart >= 0) {
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100 int i = indexOf(src, '$', keywordStart+1, true);
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101 if (i == -1) {
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102 // end of buffer reached
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103 if (rv == null) {
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104 if (keywordStart == x) {
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105 // FIXME in fact, x might be equal to keywordStart and to src.position() here ('$' is first character in the buffer,
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106 // and there are no other '$' not eols till the end of the buffer). This would lead to deadlock (filter won't consume any
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107 // bytes). To prevent this, either shall copy bytes [keywordStart..buffer.limit()) to local buffer and use it on the next invocation,
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108 // or add lookup of the keywords right after first '$' is found (do not wait for closing '$'). For now, large enough src buffer would be sufficient
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109 // not to run into such situation
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110 throw new IllegalStateException("Try src buffer of a greater size");
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111 }
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112 rv = ByteBuffer.allocate(keywordStart - x);
112
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113 }
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114 // copy all from source till latest possible kw start
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115 copySlice(src, x, keywordStart, rv);
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116 rv.flip();
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117 // and tell caller we've consumed only to the potential kw start
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118 src.position(keywordStart);
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119 return rv;
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120 } else if (src.get(i) == '$') {
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121 // end of keyword, or start of a new one.
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122 String keyword;
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123 if ((keyword = matchKeyword(src, keywordStart, i)) != null) {
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124 if (rv == null) {
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125 // src.remaining(), not .capacity because src is not read, and remaining represents
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126 // actual bytes count, while capacity - potential.
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127 // Factor of 4 is pure guess and a HACK, need to be fixed with re-expanding buffer on demand
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128 rv = ByteBuffer.allocate(isExpanding ? src.remaining() * 4 : src.remaining());
112
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129 }
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130 copySlice(src, x, keywordStart+1, rv);
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131 rv.put(keyword.getBytes());
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132 if (isExpanding) {
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133 rv.put((byte) ':');
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134 rv.put((byte) ' ');
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135 expandKeywordValue(keyword, rv);
d488c7638b87 Prototype Filter support with keyword filter as a playground
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diff changeset
136 rv.put((byte) ' ');
d488c7638b87 Prototype Filter support with keyword filter as a playground
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137 }
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138 rv.put((byte) '$');
d488c7638b87 Prototype Filter support with keyword filter as a playground
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139 keywordStart = -1;
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140 x = i+1;
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141 continue;
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142 } else {
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143 if (rv != null) {
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144 // we've already did some substitution, thus need to copy bytes we've scanned.
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145 copySlice(src, x, i, rv);
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146 } // no else in attempt to avoid rv creation if no real kw would be found
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147 keywordStart = i;
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148 x = i; // '$' at i wasn't consumed, hence x points to i, not i+1. This is to avoid problems with case: "sdfsd $ asdfs $Id$ sdf"
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149 continue;
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150 }
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151 } else {
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152 assert src.get(i) == '\n' || src.get(i) == '\r';
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153 // line break
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154 if (rv != null) {
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155 copySlice(src, x, i+1, rv);
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156 }
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157 x = i+1;
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158 keywordStart = -1; // Wasn't keyword, really
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159 continue; // try once again
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160 }
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161 }
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162 }
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163 if (keywordStart != -1) {
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164 if (rv == null) {
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165 // no expansion happened yet, and we have potential kw start
113
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166 rv = ByteBuffer.allocate(keywordStart - src.position());
112
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167 copySlice(src, src.position(), keywordStart, rv);
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168 }
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169 src.position(keywordStart);
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170 }
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171 if (rv != null) {
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172 rv.flip();
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173 return rv;
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174 }
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175 return src;
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176 }
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177
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178 /**
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179 * @param keyword
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180 * @param rv
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181 */
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182 private void expandKeywordValue(String keyword, ByteBuffer rv) {
d488c7638b87 Prototype Filter support with keyword filter as a playground
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183 if ("Id".equals(keyword)) {
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184 rv.put(identityString().getBytes());
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185 } else if ("Revision".equals(keyword)) {
d488c7638b87 Prototype Filter support with keyword filter as a playground
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186 rv.put(revision());
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187 } else if ("Author".equals(keyword)) {
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188 rv.put(username().getBytes());
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189 }
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190 }
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191
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192 private String matchKeyword(ByteBuffer src, int kwStart, int kwEnd) {
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193 assert kwEnd - kwStart - 1 > 0;
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194 assert src.get(kwStart) == src.get(kwEnd) && src.get(kwEnd) == '$';
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195 char[] chars = new char[kwEnd - kwStart - 1];
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196 int i;
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197 for (i = 0; i < chars.length; i++) {
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198 char c = (char) src.get(kwStart + 1 + i);
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199 if (c == ':') {
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200 break;
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201 }
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202 chars[i] = c;
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203 }
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204 String kw = new String(chars, 0, i);
113
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diff changeset
205 System.out.println(keywords.subMap("I", "J"));
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206 System.out.println(keywords.subMap("A", "B"));
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207 System.out.println(keywords.subMap("Au", "B"));
112
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208 return keywords.get(kw);
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209 }
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210
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211 // copies part of the src buffer, [from..to). doesn't modify src position
113
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parents: 112
diff changeset
212 static void copySlice(ByteBuffer src, int from, int to, ByteBuffer dst) {
112
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diff changeset
213 if (to > src.limit()) {
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214 throw new IllegalArgumentException("Bad right boundary");
d488c7638b87 Prototype Filter support with keyword filter as a playground
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215 }
d488c7638b87 Prototype Filter support with keyword filter as a playground
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parents:
diff changeset
216 if (dst.remaining() < to - from) {
d488c7638b87 Prototype Filter support with keyword filter as a playground
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217 throw new IllegalArgumentException("Not enough room in the destination buffer");
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218 }
d488c7638b87 Prototype Filter support with keyword filter as a playground
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diff changeset
219 for (int i = from; i < to; i++) {
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diff changeset
220 dst.put(src.get(i));
d488c7638b87 Prototype Filter support with keyword filter as a playground
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221 }
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parents:
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222 }
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223
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224 private static int indexOf(ByteBuffer b, char ch, int from, boolean newlineBreaks) {
113
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parents: 112
diff changeset
225 for (int i = from; i < b.limit(); i++) {
112
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diff changeset
226 byte c = b.get(i);
d488c7638b87 Prototype Filter support with keyword filter as a playground
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diff changeset
227 if (ch == c) {
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228 return i;
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229 }
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parents:
diff changeset
230 if (newlineBreaks && (c == '\n' || c == '\r')) {
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parents:
diff changeset
231 return i;
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parents:
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232 }
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233 }
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234 return -1;
d488c7638b87 Prototype Filter support with keyword filter as a playground
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parents:
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235 }
d488c7638b87 Prototype Filter support with keyword filter as a playground
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236
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237 private String identityString() {
d488c7638b87 Prototype Filter support with keyword filter as a playground
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238 return "sample/file.txt, asd";
d488c7638b87 Prototype Filter support with keyword filter as a playground
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parents:
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239 }
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240
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241 private byte[] revision() {
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242 return "1234567890ab".getBytes();
d488c7638b87 Prototype Filter support with keyword filter as a playground
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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243 }
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244
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245 private String username() {
d488c7638b87 Prototype Filter support with keyword filter as a playground
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diff changeset
246 /* ui.py: username()
d488c7638b87 Prototype Filter support with keyword filter as a playground
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247 Searched in this order: $HGUSER, [ui] section of hgrcs, $EMAIL
d488c7638b87 Prototype Filter support with keyword filter as a playground
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diff changeset
248 and stop searching if one of these is set.
d488c7638b87 Prototype Filter support with keyword filter as a playground
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249 If not found and ui.askusername is True, ask the user, else use
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250 ($LOGNAME or $USER or $LNAME or $USERNAME) + "@full.hostname".
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251 */
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252 return "<Sample> sample@sample.org";
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parents:
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253 }
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254
d488c7638b87 Prototype Filter support with keyword filter as a playground
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diff changeset
255 public static class Factory implements Filter.Factory {
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256
113
67ae317408c9 Filter implementation for newline translation
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diff changeset
257 public Filter create(HgRepository hgRepo, Path path, Options opts) {
112
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258 return new KeywordFilter(true);
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parents:
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259 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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260 }
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parents:
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261
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262
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263 public static void main(String[] args) throws Exception {
d488c7638b87 Prototype Filter support with keyword filter as a playground
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parents:
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264 FileInputStream fis = new FileInputStream(new File("/temp/kwoutput.txt"));
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265 FileOutputStream fos = new FileOutputStream(new File("/temp/kwoutput2.txt"));
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266 ByteBuffer b = ByteBuffer.allocate(256);
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267 KeywordFilter kwFilter = new KeywordFilter(false);
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268 while (fis.getChannel().read(b) != -1) {
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269 b.flip(); // get ready to be read
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270 ByteBuffer f = kwFilter.filter(b);
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271 fos.getChannel().write(f); // XXX in fact, f may not be fully consumed
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272 if (b.hasRemaining()) {
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273 b.compact();
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274 } else {
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275 b.clear();
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276 }
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277 }
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278 fis.close();
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279 fos.flush();
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280 fos.close();
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281 }
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282 }