1 | <?php |
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13 | * @package Text_Diff |
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14 | */ |
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15 | class Text_Diff_Renderer |
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16 | { |
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17 | /** |
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18 | * Number of leading context "lines" to preserve. |
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19 | * |
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20 | * This should be left at zero for this class, but subclasses may want to |
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21 | * set this to other values. |
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22 | */ |
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23 | public $_leading_context_lines = 0; |
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24 | |||
25 | /** |
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26 | * Number of trailing context "lines" to preserve. |
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27 | * |
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28 | * This should be left at zero for this class, but subclasses may want to |
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29 | * set this to other values. |
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30 | */ |
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31 | public $_trailing_context_lines = 0; |
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32 | |||
33 | /** |
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34 | * Constructor. |
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35 | * @param array $params |
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36 | */ |
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37 | public function __construct($params = []) |
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43 | } |
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44 | } |
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45 | } |
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46 | |||
47 | /** |
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48 | * Get any renderer parameters. |
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49 | * |
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50 | * @return array All parameters of this renderer object. |
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51 | */ |
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52 | public function getParams() |
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53 | { |
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54 | $params = []; |
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55 | foreach (get_object_vars($this) as $k => $v) { |
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56 | if ('_' === $k[0]) { |
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57 | $params[mb_substr($k, 1)] = $v; |
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58 | } |
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59 | } |
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60 | |||
61 | return $params; |
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62 | } |
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63 | |||
64 | /** |
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65 | * Renders a diff. |
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66 | * |
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67 | * @param Text_Diff $diff A Text_Diff object. |
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68 | * |
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69 | * @return string The formatted output. |
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70 | */ |
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71 | public function render($diff) |
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72 | { |
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73 | $xi = $yi = 1; |
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74 | $block = false; |
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75 | $context = []; |
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76 | |||
77 | $nlead = $this->_leading_context_lines; |
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78 | $ntrail = $this->_trailing_context_lines; |
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79 | |||
80 | $output = $this->_startDiff(); |
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81 | |||
82 | foreach ($diff->getDiff() as $edit) { |
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83 | if (is_a($edit, 'Text_Diff_Op_copy')) { |
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84 | if (is_array($block)) { |
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85 | if (count($edit->orig) <= $nlead + $ntrail) { |
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86 | $block[] = $edit; |
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87 | } else { |
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88 | if ($ntrail) { |
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89 | $context = array_slice($edit->orig, 0, $ntrail); |
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90 | $block[] = new Text_Diff_Op_copy($context); |
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91 | } |
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92 | $output .= $this->_block($x0, $ntrail + $xi - $x0, $y0, $ntrail + $yi - $y0, $block); |
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93 | $block = false; |
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94 | } |
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95 | } |
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96 | $context = $edit->orig; |
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97 | } else { |
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98 | if (!is_array($block)) { |
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99 | $context = array_slice($context, count($context) - $nlead); |
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100 | $x0 = $xi - count($context); |
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101 | $y0 = $yi - count($context); |
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102 | $block = []; |
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103 | if ($context) { |
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104 | $block[] = new Text_Diff_Op_copy($context); |
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105 | } |
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106 | } |
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107 | $block[] = $edit; |
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108 | } |
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109 | |||
110 | if ($edit->orig) { |
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111 | $xi += count($edit->orig); |
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112 | } |
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113 | if ($edit->final) { |
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114 | $yi += count($edit->final); |
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115 | } |
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116 | } |
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117 | |||
118 | if (is_array($block)) { |
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119 | $output .= $this->_block($x0, $xi - $x0, $y0, $yi - $y0, $block); |
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120 | } |
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121 | |||
122 | return $output . $this->_endDiff(); |
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123 | } |
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124 | |||
125 | /** |
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126 | * @param $xbeg |
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127 | * @param $xlen |
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128 | * @param $ybeg |
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129 | * @param $ylen |
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130 | * @param $edits |
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131 | * @return string |
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132 | */ |
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133 | public function _block($xbeg, $xlen, $ybeg, $ylen, $edits) |
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134 | { |
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135 | $output = $this->_startBlock($this->_blockHeader($xbeg, $xlen, $ybeg, $ylen)); |
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136 | |||
137 | foreach ($edits as $edit) { |
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138 | switch (mb_strtolower(get_class($edit))) { |
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139 | case 'text_diff_op_copy': |
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140 | $output .= $this->_context($edit->orig); |
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141 | break; |
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142 | case 'text_diff_op_add': |
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143 | $output .= $this->_added($edit->final); |
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144 | break; |
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145 | case 'text_diff_op_delete': |
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146 | $output .= $this->_deleted($edit->orig); |
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147 | break; |
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148 | case 'text_diff_op_change': |
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149 | $output .= $this->_changed($edit->orig, $edit->final); |
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150 | break; |
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151 | } |
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152 | } |
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153 | |||
154 | return $output . $this->_endBlock(); |
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155 | } |
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156 | |||
157 | /** |
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158 | * @return string |
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159 | */ |
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160 | public function _startDiff() |
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161 | { |
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162 | return ''; |
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163 | } |
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164 | |||
165 | /** |
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166 | * @return string |
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167 | */ |
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168 | public function _endDiff() |
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169 | { |
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170 | return ''; |
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171 | } |
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172 | |||
173 | /** |
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174 | * @param $xbeg |
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175 | * @param $xlen |
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176 | * @param $ybeg |
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177 | * @param $ylen |
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178 | * @return string |
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179 | */ |
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180 | public function _blockHeader($xbeg, $xlen, $ybeg, $ylen) |
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181 | { |
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182 | if ($xlen > 1) { |
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183 | $xbeg .= ',' . ($xbeg + $xlen - 1); |
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184 | } |
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185 | if ($ylen > 1) { |
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186 | $ybeg .= ',' . ($ybeg + $ylen - 1); |
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187 | } |
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188 | |||
189 | return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg; |
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190 | } |
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191 | |||
192 | /** |
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193 | * @param $header |
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194 | * @return string |
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195 | */ |
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196 | public function _startBlock($header) |
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197 | { |
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198 | return $header . "\n"; |
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199 | } |
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200 | |||
201 | /** |
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202 | * @return string |
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203 | */ |
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204 | public function _endBlock() |
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205 | { |
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206 | return ''; |
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207 | } |
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208 | |||
209 | /** |
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210 | * @param $lines |
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211 | * @param string $prefix |
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212 | * @return string |
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213 | */ |
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214 | public function _lines($lines, $prefix = ' ') |
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215 | { |
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216 | return $prefix . implode("\n$prefix", $lines) . "\n"; |
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217 | } |
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218 | |||
219 | /** |
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220 | * @param $lines |
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221 | * @return string |
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222 | */ |
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223 | public function _context($lines) |
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224 | { |
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225 | return $this->_lines($lines); |
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226 | } |
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227 | |||
228 | /** |
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229 | * @param $lines |
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230 | * @return string |
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231 | */ |
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232 | public function _added($lines) |
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233 | { |
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234 | return $this->_lines($lines, '>'); |
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235 | } |
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236 | |||
237 | /** |
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238 | * @param $lines |
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239 | * @return string |
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240 | */ |
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241 | public function _deleted($lines) |
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242 | { |
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243 | return $this->_lines($lines, '<'); |
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244 | } |
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245 | |||
246 | /** |
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247 | * @param $orig |
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248 | * @param $final |
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249 | * @return string |
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250 | */ |
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251 | public function _changed($orig, $final) |
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254 | } |
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255 | } |
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256 |