1 | <?php |
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2 | |||
3 | /** |
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4 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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5 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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6 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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7 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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8 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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9 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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10 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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11 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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12 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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13 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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14 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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15 | * |
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16 | * This software consists of voluntary contributions made by many individuals |
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17 | * and is licensed under the LGPL. For more information please see |
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18 | * <http://phing.info>. |
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19 | */ |
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20 | |||
21 | namespace Phing\Filter; |
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22 | |||
23 | use Phing\Io\FilterReader; |
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24 | use Phing\Io\Reader; |
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25 | |||
26 | /** |
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27 | * Reads the first <code>n</code> lines of a stream. |
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28 | * (Default is first 10 lines.) |
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29 | * <p> |
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30 | * Example: |
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31 | * <pre><headfilter lines="3"/></pre> |
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32 | * Or: |
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33 | * <pre><filterreader classname="phing.filters.HeadFilter"> |
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34 | * <param name="lines" value="3"/> |
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35 | * </filterreader></pre>. |
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36 | * |
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37 | * @author <a href="mailto:[email protected]">Yannick Lecaillez</a> |
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38 | * @author hans lellelid, [email protected] |
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39 | * |
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40 | * @see FilterReader |
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41 | */ |
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42 | class HeadFilter extends BaseParamFilterReader implements ChainableReader |
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43 | { |
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44 | /** |
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45 | * Parameter name for the number of lines to be returned. |
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46 | */ |
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47 | public const LINES_KEY = 'lines'; |
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48 | |||
49 | /** |
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50 | * Parameter name for the number of lines to be skipped. |
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51 | */ |
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52 | public const SKIP_KEY = 'skip'; |
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53 | |||
54 | /** |
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55 | * Number of lines currently read in. |
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56 | * |
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57 | * @var int |
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58 | */ |
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59 | private $linesRead = 0; |
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60 | |||
61 | /** |
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62 | * Number of lines to be returned in the filtered stream. |
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63 | * |
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64 | * @var int |
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65 | */ |
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66 | private $lines = 10; |
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67 | |||
68 | /** |
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69 | * Number of lines to be skipped. |
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70 | */ |
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71 | private $skip = 0; |
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72 | |||
73 | /** |
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74 | * Returns first n lines of stream. |
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75 | * |
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76 | * @param int $len |
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77 | * |
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78 | * @return int|string the resulting stream, or -1 |
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79 | * if the end of the resulting stream has been reached |
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80 | */ |
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81 | 2 | public function read($len = null) |
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82 | { |
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83 | 2 | if (!$this->getInitialized()) { |
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84 | $this->initialize(); |
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85 | $this->setInitialized(true); |
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86 | } |
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87 | |||
88 | // note, if buffer contains fewer lines than |
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89 | // $this->_lines this code will not work. |
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90 | |||
91 | 2 | if ($this->linesRead < $this->lines) { |
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92 | 2 | $buffer = $this->in->read($len); |
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93 | |||
94 | 2 | if (-1 === $buffer) { |
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95 | 2 | return -1; |
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96 | } |
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97 | |||
98 | // now grab first X lines from buffer |
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99 | |||
100 | 2 | $lines = explode("\n", $buffer); |
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101 | |||
102 | 2 | $linesCount = count($lines); |
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103 | |||
104 | // must account for possibility that the num lines requested could |
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105 | // involve more than one buffer read. |
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106 | 2 | $len = ($linesCount > $this->lines ? $this->lines - $this->linesRead : $linesCount); |
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107 | 2 | $filtered_buffer = implode("\n", array_slice($lines, $this->skip, $len)); |
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108 | 2 | $this->linesRead += $len; |
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109 | |||
110 | 2 | return $filtered_buffer; |
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111 | } |
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112 | |||
113 | 2 | return -1; // EOF, since the file is "finished" as far as subsequent filters are concerned. |
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114 | } |
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115 | |||
116 | /** |
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117 | * Sets the number of lines to be returned in the filtered stream. |
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118 | * |
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119 | * @param int $lines the number of lines to be returned in the filtered stream |
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120 | */ |
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121 | 2 | public function setLines($lines) |
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122 | { |
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123 | 2 | $this->lines = (int) $lines; |
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124 | } |
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125 | |||
126 | /** |
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127 | * Returns the number of lines to be returned in the filtered stream. |
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128 | * |
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129 | * @return int the number of lines to be returned in the filtered stream |
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130 | */ |
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131 | 2 | public function getLines() |
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132 | { |
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133 | 2 | return $this->lines; |
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134 | } |
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135 | |||
136 | /** |
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137 | * Sets the number of lines to be skipped in the filtered stream. |
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138 | * |
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139 | * @param int $skip the number of lines to be skipped in the filtered stream |
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140 | */ |
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141 | 2 | public function setSkip($skip) |
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142 | { |
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143 | 2 | $this->skip = (int) $skip; |
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144 | } |
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145 | |||
146 | /** |
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147 | * Creates a new HeadFilter using the passed in |
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148 | * Reader for instantiation. |
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149 | * |
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150 | * @param Reader $reader A Reader object providing the underlying stream. |
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151 | * Must not be <code>null</code>. |
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152 | * |
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153 | * @return HeadFilter a new filter based on this configuration, but filtering |
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154 | * the specified reader |
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155 | */ |
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156 | 2 | public function chain(Reader $reader): Reader |
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157 | { |
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158 | 2 | $newFilter = new self($reader); |
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159 | 2 | $newFilter->setLines($this->getLines()); |
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160 | 2 | $newFilter->setSkip($this->getSkip()); |
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161 | 2 | $newFilter->setInitialized(true); |
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162 | 2 | $newFilter->setProject($this->getProject()); |
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163 | |||
164 | 2 | return $newFilter; |
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165 | } |
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166 | |||
167 | /** |
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168 | * Returns the number of lines to be skipped in the filtered stream. |
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169 | * |
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170 | * @return int the number of lines to be skipped in the filtered stream |
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171 | */ |
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172 | 2 | private function getSkip() |
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173 | { |
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174 | 2 | return $this->skip; |
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175 | } |
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176 | |||
177 | /** |
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178 | * Scans the parameters list for the "lines" parameter and uses |
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179 | * it to set the number of lines to be returned in the filtered stream. |
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180 | */ |
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181 | private function initialize() |
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182 | { |
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183 | $params = $this->getParameters(); |
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184 | if (null !== $params) { |
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185 | foreach ($params as $param) { |
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186 | if (self::LINES_KEY === $param->getName()) { |
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187 | $this->lines = (int) $param->getValue(); |
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188 | |||
189 | continue; |
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190 | } |
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191 | if (self::SKIP_KEY === $param->getName()) { |
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192 | $this->lines = (int) $param->getValue(); |
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193 | |||
194 | continue; |
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195 | } |
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196 | } |
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197 | } |
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198 | } |
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199 | } |
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200 |