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1 | <?php |
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2 | /** |
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3 | * A PHP diff engine for phpwiki. (Taken from phpwiki-1.3.3) |
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4 | * |
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5 | * Copyright © 2000, 2001 Geoffrey T. Dairiki <[email protected]> |
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6 | * You may copy this code freely under the conditions of the GPL. |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or modify |
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9 | * it under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; either version 2 of the License, or |
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11 | * (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License along |
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19 | * with this program; if not, write to the Free Software Foundation, Inc., |
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20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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21 | * http://www.gnu.org/copyleft/gpl.html |
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22 | * |
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23 | * @file |
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24 | * @ingroup DifferenceEngine |
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25 | * @defgroup DifferenceEngine DifferenceEngine |
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26 | */ |
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27 | |||
28 | /** |
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29 | * The base class for all other DiffOp classes. |
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30 | * |
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31 | * The classes that extend DiffOp are: DiffOpCopy, DiffOpDelete, DiffOpAdd and |
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32 | * DiffOpChange. FakeDiffOp also extends DiffOp, but it is not located in this file. |
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33 | * |
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34 | * @private |
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35 | * @ingroup DifferenceEngine |
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36 | */ |
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37 | abstract class DiffOp { |
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38 | |||
39 | /** |
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40 | * @var string |
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41 | */ |
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42 | public $type; |
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43 | |||
44 | /** |
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45 | * @var string[] |
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46 | */ |
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47 | public $orig; |
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48 | |||
49 | /** |
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50 | * @var string[] |
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51 | */ |
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52 | public $closing; |
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53 | |||
54 | /** |
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55 | * @return string |
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56 | */ |
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57 | public function getType() { |
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58 | return $this->type; |
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59 | } |
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60 | |||
61 | /** |
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62 | * @return string[] |
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63 | */ |
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64 | public function getOrig() { |
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65 | return $this->orig; |
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66 | } |
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67 | |||
68 | /** |
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69 | * @param int $i |
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70 | * @return string|null |
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71 | */ |
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72 | public function getClosing( $i = null ) { |
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73 | if ( $i === null ) { |
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74 | return $this->closing; |
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75 | } |
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76 | if ( array_key_exists( $i, $this->closing ) ) { |
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77 | return $this->closing[$i]; |
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78 | } |
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79 | return null; |
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80 | } |
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81 | |||
82 | abstract public function reverse(); |
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83 | |||
84 | /** |
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85 | * @return int |
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86 | */ |
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87 | public function norig() { |
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88 | return $this->orig ? count( $this->orig ) : 0; |
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89 | } |
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90 | |||
91 | /** |
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92 | * @return int |
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93 | */ |
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94 | public function nclosing() { |
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95 | return $this->closing ? count( $this->closing ) : 0; |
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96 | } |
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97 | } |
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98 | |||
99 | /** |
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100 | * Extends DiffOp. Used to mark strings that have been |
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101 | * copied from one string array to the other. |
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102 | * |
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103 | * @private |
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104 | * @ingroup DifferenceEngine |
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105 | */ |
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106 | class DiffOpCopy extends DiffOp { |
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107 | public $type = 'copy'; |
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108 | |||
109 | public function __construct( $orig, $closing = false ) { |
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110 | if ( !is_array( $closing ) ) { |
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111 | $closing = $orig; |
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112 | } |
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113 | $this->orig = $orig; |
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114 | $this->closing = $closing; |
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115 | } |
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116 | |||
117 | /** |
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118 | * @return DiffOpCopy |
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119 | */ |
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120 | public function reverse() { |
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121 | return new DiffOpCopy( $this->closing, $this->orig ); |
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122 | } |
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123 | } |
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124 | |||
125 | /** |
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126 | * Extends DiffOp. Used to mark strings that have been |
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127 | * deleted from the first string array. |
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128 | * |
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129 | * @private |
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130 | * @ingroup DifferenceEngine |
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131 | */ |
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132 | View Code Duplication | class DiffOpDelete extends DiffOp { |
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0 ignored issues
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133 | public $type = 'delete'; |
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134 | |||
135 | public function __construct( $lines ) { |
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136 | $this->orig = $lines; |
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137 | $this->closing = false; |
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0 ignored issues
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It seems like
false of type false is incompatible with the declared type array<integer,string> of property $closing .
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. ![]() |
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138 | } |
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139 | |||
140 | /** |
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141 | * @return DiffOpAdd |
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142 | */ |
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143 | public function reverse() { |
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144 | return new DiffOpAdd( $this->orig ); |
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145 | } |
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146 | } |
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147 | |||
148 | /** |
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149 | * Extends DiffOp. Used to mark strings that have been |
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150 | * added from the first string array. |
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151 | * |
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152 | * @private |
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153 | * @ingroup DifferenceEngine |
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154 | */ |
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155 | View Code Duplication | class DiffOpAdd extends DiffOp { |
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0 ignored issues
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This class seems to be duplicated in your project.
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. ![]() |
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156 | public $type = 'add'; |
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157 | |||
158 | public function __construct( $lines ) { |
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159 | $this->closing = $lines; |
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160 | $this->orig = false; |
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0 ignored issues
–
show
It seems like
false of type false is incompatible with the declared type array<integer,string> of property $orig .
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. ![]() |
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161 | } |
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162 | |||
163 | /** |
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164 | * @return DiffOpDelete |
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165 | */ |
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166 | public function reverse() { |
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167 | return new DiffOpDelete( $this->closing ); |
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168 | } |
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169 | } |
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170 | |||
171 | /** |
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172 | * Extends DiffOp. Used to mark strings that have been |
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173 | * changed from the first string array (both added and subtracted). |
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174 | * |
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175 | * @private |
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176 | * @ingroup DifferenceEngine |
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177 | */ |
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178 | class DiffOpChange extends DiffOp { |
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179 | public $type = 'change'; |
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180 | |||
181 | public function __construct( $orig, $closing ) { |
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182 | $this->orig = $orig; |
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183 | $this->closing = $closing; |
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184 | } |
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185 | |||
186 | /** |
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187 | * @return DiffOpChange |
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188 | */ |
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189 | public function reverse() { |
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190 | return new DiffOpChange( $this->closing, $this->orig ); |
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191 | } |
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192 | } |
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193 | |||
194 | /** |
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195 | * Class representing a 'diff' between two sequences of strings. |
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196 | * @todo document |
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197 | * @private |
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198 | * @ingroup DifferenceEngine |
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199 | */ |
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200 | class Diff { |
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201 | |||
202 | /** |
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203 | * @var DiffOp[] |
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204 | */ |
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205 | public $edits; |
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206 | |||
207 | /** |
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208 | * @var int If this diff complexity is exceeded, a ComplexityException is thrown |
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209 | * 0 means no limit. |
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210 | */ |
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211 | protected $bailoutComplexity = 0; |
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212 | |||
213 | /** |
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214 | * Constructor. |
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215 | * Computes diff between sequences of strings. |
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216 | * |
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217 | * @param string[] $from_lines An array of strings. |
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218 | * Typically these are lines from a file. |
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219 | * @param string[] $to_lines An array of strings. |
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220 | * @throws \MediaWiki\Diff\ComplexityException |
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221 | */ |
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222 | public function __construct( $from_lines, $to_lines ) { |
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223 | $eng = new DiffEngine; |
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224 | $eng->setBailoutComplexity( $this->bailoutComplexity ); |
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225 | $this->edits = $eng->diff( $from_lines, $to_lines ); |
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226 | } |
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227 | |||
228 | /** |
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229 | * @return DiffOp[] |
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230 | */ |
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231 | public function getEdits() { |
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232 | return $this->edits; |
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233 | } |
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234 | |||
235 | /** |
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236 | * Compute reversed Diff. |
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237 | * |
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238 | * SYNOPSIS: |
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239 | * |
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240 | * $diff = new Diff($lines1, $lines2); |
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241 | * $rev = $diff->reverse(); |
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242 | * |
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243 | * @return Object A Diff object representing the inverse of the |
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244 | * original diff. |
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245 | */ |
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246 | public function reverse() { |
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247 | $rev = $this; |
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248 | $rev->edits = []; |
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249 | /** @var DiffOp $edit */ |
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250 | foreach ( $this->edits as $edit ) { |
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251 | $rev->edits[] = $edit->reverse(); |
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252 | } |
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253 | |||
254 | return $rev; |
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255 | } |
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256 | |||
257 | /** |
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258 | * Check for empty diff. |
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259 | * |
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260 | * @return bool True if two sequences were identical. |
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261 | */ |
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262 | public function isEmpty() { |
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263 | foreach ( $this->edits as $edit ) { |
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264 | if ( $edit->type != 'copy' ) { |
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265 | return false; |
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266 | } |
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267 | } |
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268 | |||
269 | return true; |
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270 | } |
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271 | |||
272 | /** |
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273 | * Compute the length of the Longest Common Subsequence (LCS). |
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274 | * |
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275 | * This is mostly for diagnostic purposed. |
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276 | * |
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277 | * @return int The length of the LCS. |
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278 | */ |
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279 | public function lcs() { |
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280 | $lcs = 0; |
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281 | foreach ( $this->edits as $edit ) { |
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282 | if ( $edit->type == 'copy' ) { |
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283 | $lcs += count( $edit->orig ); |
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284 | } |
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285 | } |
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286 | |||
287 | return $lcs; |
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288 | } |
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289 | |||
290 | /** |
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291 | * Get the original set of lines. |
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292 | * |
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293 | * This reconstructs the $from_lines parameter passed to the |
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294 | * constructor. |
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295 | * |
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296 | * @return string[] The original sequence of strings. |
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297 | */ |
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298 | View Code Duplication | public function orig() { |
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299 | $lines = []; |
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300 | |||
301 | foreach ( $this->edits as $edit ) { |
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302 | if ( $edit->orig ) { |
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303 | array_splice( $lines, count( $lines ), 0, $edit->orig ); |
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304 | } |
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305 | } |
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306 | |||
307 | return $lines; |
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308 | } |
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309 | |||
310 | /** |
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311 | * Get the closing set of lines. |
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312 | * |
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313 | * This reconstructs the $to_lines parameter passed to the |
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314 | * constructor. |
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315 | * |
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316 | * @return string[] The sequence of strings. |
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317 | */ |
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318 | View Code Duplication | public function closing() { |
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319 | $lines = []; |
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320 | |||
321 | foreach ( $this->edits as $edit ) { |
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322 | if ( $edit->closing ) { |
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323 | array_splice( $lines, count( $lines ), 0, $edit->closing ); |
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324 | } |
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325 | } |
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326 | |||
327 | return $lines; |
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328 | } |
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329 | } |
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330 | |||
331 | /** |
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332 | * @deprecated Alias for WordAccumulator, to be soon removed |
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333 | */ |
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334 | class HWLDFWordAccumulator extends MediaWiki\Diff\WordAccumulator { |
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335 | } |
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336 |
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.