mambax7 /
extgallery
Complex classes like Parsedown often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Parsedown, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 19 | class Parsedown |
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| 20 | { |
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| 21 | # |
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| 22 | # Multiton (http://en.wikipedia.org/wiki/Multiton_pattern) |
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| 23 | # |
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| 24 | |||
| 25 | /** |
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| 26 | * @param string $name |
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| 27 | * @return mixed|Parsedown |
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| 28 | */ |
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| 29 | public static function instance($name = 'default') |
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| 40 | } |
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| 41 | |||
| 42 | private static $instances = array(); |
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| 43 | |||
| 44 | # |
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| 45 | # Setters |
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| 46 | # |
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| 47 | |||
| 48 | private $break_marker = " \n"; |
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| 49 | |||
| 50 | /** |
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| 51 | * @param $breaks_enabled |
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| 52 | * @return $this |
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| 53 | */ |
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| 54 | public function set_breaks_enabled($breaks_enabled) |
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| 55 | { |
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| 56 | $this->break_marker = $breaks_enabled ? "\n" : " \n"; |
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| 57 | |||
| 58 | return $this; |
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| 59 | } |
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| 60 | |||
| 61 | # |
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| 62 | # Fields |
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| 63 | # |
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| 64 | |||
| 65 | private $reference_map = array(); |
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| 66 | private $escape_sequence_map = array(); |
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| 67 | |||
| 68 | # |
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| 69 | # Public Methods |
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| 70 | # |
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| 71 | |||
| 72 | /** |
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| 73 | * @param $text |
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| 74 | * @return mixed|string |
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| 75 | */ |
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| 76 | public function parse($text) |
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| 77 | { |
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| 78 | # removes \r characters |
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| 79 | $text = str_replace("\r\n", "\n", $text); |
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| 80 | $text = str_replace("\r", "\n", $text); |
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| 81 | |||
| 82 | # replaces tabs with spaces |
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| 83 | $text = str_replace("\t", ' ', $text); |
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| 84 | |||
| 85 | # encodes escape sequences |
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| 86 | |||
| 87 | if (false !== strpos($text, '\\')) { |
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| 88 | $escape_sequences = array('\\\\', '\`', '\*', '\_', '\{', '\}', '\[', '\]', '\(', '\)', '\>', '\#', '\+', '\-', '\.', '\!'); |
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| 89 | |||
| 90 | foreach ($escape_sequences as $index => $escape_sequence) { |
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| 91 | if (false !== strpos($text, $escape_sequence)) { |
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| 92 | $code = "\x1A" . '\\' . $index . ';'; |
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| 93 | |||
| 94 | $text = str_replace($escape_sequence, $code, $text); |
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| 95 | |||
| 96 | $this->escape_sequence_map[$code] = $escape_sequence; |
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| 97 | } |
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| 98 | } |
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| 99 | } |
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| 100 | |||
| 101 | # ~ |
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| 102 | |||
| 103 | $text = trim($text, "\n"); |
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| 104 | |||
| 105 | $lines = explode("\n", $text); |
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| 106 | |||
| 107 | $text = $this->parse_block_elements($lines); |
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| 108 | |||
| 109 | # decodes escape sequences |
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| 110 | |||
| 111 | foreach ($this->escape_sequence_map as $code => $escape_sequence) { |
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| 112 | $text = str_replace($code, $escape_sequence[1], $text); |
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| 113 | } |
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| 114 | |||
| 115 | # ~ |
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| 116 | |||
| 117 | $text = rtrim($text, "\n"); |
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| 118 | |||
| 119 | return $text; |
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| 120 | } |
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| 121 | |||
| 122 | # |
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| 123 | # Private Methods |
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| 124 | # |
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| 125 | |||
| 126 | /** |
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| 127 | * @param array $lines |
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| 128 | * @param string $context |
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| 129 | * @return string |
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| 130 | */ |
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| 131 | private function parse_block_elements(array $lines, $context = '') |
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| 132 | { |
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| 133 | $elements = array(); |
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| 134 | |||
| 135 | $element = array( |
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| 136 | 'type' => '' |
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| 137 | ); |
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| 138 | |||
| 139 | foreach ($lines as $line) { |
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| 140 | # fenced elements |
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| 141 | |||
| 142 | switch ($element['type']) { |
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| 143 | case 'fenced block': |
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| 144 | |||
| 145 | if (!isset($element['closed'])) { |
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| 146 | if (preg_match('/^[ ]*' . $element['fence'][0] . '{3,}[ ]*$/', $line)) { |
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| 147 | $element['closed'] = true; |
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| 148 | } else { |
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| 149 | '' !== $element['text'] and $element['text'] .= "\n"; |
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| 150 | |||
| 151 | $element['text'] .= $line; |
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| 152 | } |
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| 153 | |||
| 154 | continue 2; |
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| 155 | } |
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| 156 | |||
| 157 | break; |
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| 158 | |||
| 159 | case 'block-level markup': |
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| 160 | |||
| 161 | if (!isset($element['closed'])) { |
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| 162 | if (false !== strpos($line, $element['start'])) { # opening tag |
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| 163 | $element['depth']++; |
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| 164 | } |
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| 165 | |||
| 166 | if (false !== strpos($line, $element['end'])) { # closing tag |
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| 167 | $element['depth'] > 0 ? $element['depth']-- : $element['closed'] = true; |
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| 168 | } |
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| 169 | |||
| 170 | $element['text'] .= "\n" . $line; |
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| 171 | |||
| 172 | continue 2; |
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| 173 | } |
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| 174 | |||
| 175 | break; |
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| 176 | } |
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| 177 | |||
| 178 | # * |
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| 179 | |||
| 180 | $deindented_line = ltrim($line); |
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| 181 | |||
| 182 | if ('' === $deindented_line) { |
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| 183 | $element['interrupted'] = true; |
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| 184 | |||
| 185 | continue; |
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| 186 | } |
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| 187 | |||
| 188 | # composite elements |
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| 189 | |||
| 190 | switch ($element['type']) { |
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| 191 | case 'blockquote': |
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| 192 | |||
| 193 | if (!isset($element['interrupted'])) { |
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| 194 | $line = preg_replace('/^[ ]*>[ ]?/', '', $line); |
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| 195 | |||
| 196 | $element['lines'] [] = $line; |
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| 197 | |||
| 198 | continue 2; |
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| 199 | } |
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| 200 | |||
| 201 | break; |
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| 202 | |||
| 203 | case 'li': |
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| 204 | |||
| 205 | if (preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches)) { |
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| 206 | if ($element['indentation'] !== $matches[1]) { |
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| 207 | $element['lines'] [] = $line; |
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| 208 | } else { |
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| 209 | unset($element['last']); |
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| 210 | |||
| 211 | $elements [] = $element; |
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| 212 | |||
| 213 | $element = array( |
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| 214 | 'type' => 'li', |
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| 215 | 'indentation' => $matches[1], |
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| 216 | 'last' => true, |
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| 217 | 'lines' => array( |
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| 218 | preg_replace('/^[ ]{0,4}/', '', $matches[3]) |
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| 219 | ) |
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| 220 | ); |
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| 221 | } |
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| 222 | |||
| 223 | continue 2; |
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| 224 | } |
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| 225 | |||
| 226 | if (isset($element['interrupted'])) { |
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| 227 | if (' ' === $line[0]) { |
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| 228 | $element['lines'] [] = ''; |
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| 229 | |||
| 230 | $line = preg_replace('/^[ ]{0,4}/', '', $line); |
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| 231 | |||
| 232 | $element['lines'] [] = $line; |
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| 233 | |||
| 234 | unset($element['interrupted']); |
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| 235 | |||
| 236 | continue 2; |
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| 237 | } |
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| 238 | } else { |
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| 239 | $line = preg_replace('/^[ ]{0,4}/', '', $line); |
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| 240 | |||
| 241 | $element['lines'] [] = $line; |
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| 242 | |||
| 243 | continue 2; |
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| 244 | } |
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| 245 | |||
| 246 | break; |
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| 247 | } |
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| 248 | |||
| 249 | # indentation sensitive types |
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| 250 | |||
| 251 | switch ($line[0]) { |
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| 252 | case ' ': |
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| 253 | |||
| 254 | # code block |
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| 255 | |||
| 256 | if (isset($line[3]) and ' ' === $line[3] and ' ' === $line[2] and ' ' === $line[1]) { |
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| 257 | $code_line = substr($line, 4); |
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| 258 | |||
| 259 | if ('code block' === $element['type']) { |
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| 260 | if (isset($element['interrupted'])) { |
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| 261 | $element['text'] .= "\n"; |
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| 262 | |||
| 263 | unset($element['interrupted']); |
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| 264 | } |
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| 265 | |||
| 266 | $element['text'] .= "\n" . $code_line; |
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| 267 | } else { |
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| 268 | $elements [] = $element; |
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| 269 | |||
| 270 | $element = array( |
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| 271 | 'type' => 'code block', |
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| 272 | 'text' => $code_line |
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| 273 | ); |
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| 274 | } |
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| 275 | |||
| 276 | continue 2; |
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| 277 | } |
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| 278 | |||
| 279 | break; |
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| 280 | |||
| 281 | case '#': |
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| 282 | |||
| 283 | # atx heading (#) |
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| 284 | |||
| 285 | if (isset($line[1])) { |
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| 286 | $elements [] = $element; |
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| 287 | |||
| 288 | $level = 1; |
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| 289 | |||
| 290 | while (isset($line[$level]) and '#' === $line[$level]) { |
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| 291 | ++$level; |
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| 292 | } |
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| 293 | |||
| 294 | $element = array( |
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| 295 | 'type' => 'heading', |
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| 296 | 'text' => trim($line, '# '), |
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| 297 | 'level' => $level |
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| 298 | ); |
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| 299 | |||
| 300 | continue 2; |
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| 301 | } |
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| 302 | |||
| 303 | break; |
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| 304 | |||
| 305 | case '-': |
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| 306 | case '=': |
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| 307 | |||
| 308 | # setext heading |
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| 309 | |||
| 310 | if ('paragraph' === $element['type'] and false === isset($element['interrupted'])) { |
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| 311 | $chopped_line = rtrim($line); |
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| 312 | |||
| 313 | $i = 1; |
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| 314 | |||
| 315 | while (isset($chopped_line[$i])) { |
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| 316 | if ($chopped_line[$i] !== $line[0]) { |
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| 317 | break 2; |
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| 318 | } |
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| 319 | |||
| 320 | ++$i; |
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| 321 | } |
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| 322 | |||
| 323 | $element['type'] = 'heading'; |
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| 324 | $element['level'] = '-' === $line[0] ? 2 : 1; |
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| 325 | |||
| 326 | continue 2; |
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| 327 | } |
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| 328 | |||
| 329 | break; |
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| 330 | } |
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| 331 | |||
| 332 | # indentation insensitive types |
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| 333 | |||
| 334 | switch ($deindented_line[0]) { |
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| 335 | case '<': |
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| 336 | |||
| 337 | $position = strpos($deindented_line, '>'); |
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| 338 | |||
| 339 | if ($position > 1) { # tag |
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| 340 | $name = substr($deindented_line, 1, $position - 1); |
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| 341 | $name = rtrim($name); |
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| 342 | |||
| 343 | if ('/' === substr($name, -1)) { |
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| 344 | $self_closing = true; |
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| 345 | |||
| 346 | $name = substr($name, 0, -1); |
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| 347 | } |
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| 348 | |||
| 349 | $position = strpos($name, ' '); |
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| 350 | |||
| 351 | if ($position) { |
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| 352 | $name = substr($name, 0, $position); |
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| 353 | } |
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| 354 | |||
| 355 | if (!ctype_alpha($name)) { |
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| 356 | break; |
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| 357 | } |
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| 358 | |||
| 359 | if (in_array($name, $this->inline_tags)) { |
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| 360 | break; |
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| 361 | } |
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| 362 | |||
| 363 | $elements [] = $element; |
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| 364 | |||
| 365 | if (isset($self_closing)) { |
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| 366 | $element = array( |
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| 367 | 'type' => 'self-closing tag', |
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| 368 | 'text' => $deindented_line |
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| 369 | ); |
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| 370 | |||
| 371 | unset($self_closing); |
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| 372 | |||
| 373 | continue 2; |
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| 374 | } |
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| 375 | |||
| 376 | $element = array( |
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| 377 | 'type' => 'block-level markup', |
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| 378 | 'text' => $deindented_line, |
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| 379 | 'start' => '<' . $name . '>', |
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| 380 | 'end' => '</' . $name . '>', |
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| 381 | 'depth' => 0 |
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| 382 | ); |
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| 383 | |||
| 384 | if (strpos($deindented_line, $element['end'])) { |
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| 385 | $element['closed'] = true; |
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| 386 | } |
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| 387 | |||
| 388 | continue 2; |
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| 389 | } |
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| 390 | |||
| 391 | break; |
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| 392 | |||
| 393 | case '>': |
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| 394 | |||
| 395 | # quote |
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| 396 | |||
| 397 | if (preg_match('/^>[ ]?(.*)/', $deindented_line, $matches)) { |
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| 398 | $elements [] = $element; |
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| 399 | |||
| 400 | $element = array( |
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| 401 | 'type' => 'blockquote', |
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| 402 | 'lines' => array( |
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| 403 | $matches[1] |
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| 404 | ) |
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| 405 | ); |
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| 406 | |||
| 407 | continue 2; |
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| 408 | } |
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| 409 | |||
| 410 | break; |
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| 411 | |||
| 412 | case '[': |
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| 413 | |||
| 414 | # reference |
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| 415 | |||
| 416 | if (preg_match('/^\[(.+?)\]:[ ]*(.+?)(?:[ ]+[\'"](.+?)[\'"])?[ ]*$/', $deindented_line, $matches)) { |
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| 417 | $label = strtolower($matches[1]); |
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| 418 | |||
| 419 | $this->reference_map[$label] = array( |
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| 420 | '»' => trim($matches[2], '<>') |
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| 421 | ); |
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| 422 | |||
| 423 | if (isset($matches[3])) { |
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| 424 | $this->reference_map[$label]['#'] = $matches[3]; |
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| 425 | } |
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| 426 | |||
| 427 | continue 2; |
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| 428 | } |
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| 429 | |||
| 430 | break; |
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| 431 | |||
| 432 | case '`': |
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| 433 | case '~': |
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| 434 | |||
| 435 | # fenced code block |
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| 436 | |||
| 437 | if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\S+)?[ ]*$/', $deindented_line, $matches)) { |
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| 438 | $elements [] = $element; |
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| 439 | |||
| 440 | $element = array( |
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| 441 | 'type' => 'fenced block', |
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| 442 | 'text' => '', |
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| 443 | 'fence' => $matches[1] |
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| 444 | ); |
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| 445 | |||
| 446 | isset($matches[2]) and $element['language'] = $matches[2]; |
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| 447 | |||
| 448 | continue 2; |
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| 449 | } |
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| 450 | |||
| 451 | break; |
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| 452 | |||
| 453 | case '*': |
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| 454 | case '+': |
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| 455 | case '-': |
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| 456 | case '_': |
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| 457 | |||
| 458 | # hr |
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| 459 | |||
| 460 | if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $deindented_line)) { |
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| 461 | $elements [] = $element; |
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| 462 | |||
| 463 | $element = array( |
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| 464 | 'type' => 'hr' |
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| 465 | ); |
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| 466 | |||
| 467 | continue 2; |
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| 468 | } |
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| 469 | |||
| 470 | # li |
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| 471 | |||
| 472 | if (preg_match('/^([ ]*)[*+-][ ](.*)/', $line, $matches)) { |
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| 473 | $elements [] = $element; |
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| 474 | |||
| 475 | $element = array( |
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| 476 | 'type' => 'li', |
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| 477 | 'ordered' => false, |
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| 478 | 'indentation' => $matches[1], |
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| 479 | 'last' => true, |
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| 480 | 'lines' => array( |
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| 481 | preg_replace('/^[ ]{0,4}/', '', $matches[2]) |
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| 482 | ) |
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| 483 | ); |
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| 484 | |||
| 485 | continue 2; |
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| 486 | } |
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| 487 | } |
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| 488 | |||
| 489 | # li |
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| 490 | |||
| 491 | if ($deindented_line[0] <= '9' and $deindented_line[0] >= '0' and preg_match('/^([ ]*)\d+[.][ ](.*)/', $line, $matches)) { |
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| 492 | $elements [] = $element; |
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| 493 | |||
| 494 | $element = array( |
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| 495 | 'type' => 'li', |
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| 496 | 'ordered' => true, |
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| 497 | 'indentation' => $matches[1], |
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| 498 | 'last' => true, |
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| 499 | 'lines' => array( |
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| 500 | preg_replace('/^[ ]{0,4}/', '', $matches[2]) |
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| 501 | ) |
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| 502 | ); |
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| 503 | |||
| 504 | continue; |
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| 505 | } |
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| 506 | |||
| 507 | # paragraph |
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| 508 | |||
| 509 | if ('paragraph' === $element['type']) { |
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| 510 | if (isset($element['interrupted'])) { |
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| 511 | $elements [] = $element; |
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| 512 | |||
| 513 | $element['text'] = $line; |
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| 514 | |||
| 515 | unset($element['interrupted']); |
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| 516 | } else { |
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| 517 | $element['text'] .= "\n" . $line; |
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| 518 | } |
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| 519 | } else { |
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| 520 | $elements [] = $element; |
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| 521 | |||
| 522 | $element = array( |
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| 523 | 'type' => 'paragraph', |
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| 524 | 'text' => $line |
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| 525 | ); |
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| 526 | } |
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| 527 | } |
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| 528 | |||
| 529 | $elements [] = $element; |
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| 530 | |||
| 531 | unset($elements[0]); |
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| 532 | |||
| 533 | # |
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| 534 | # ~ |
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| 535 | # |
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| 536 | |||
| 537 | $markup = ''; |
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| 538 | |||
| 539 | foreach ($elements as $element) { |
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| 540 | switch ($element['type']) { |
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| 541 | case 'paragraph': |
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| 542 | |||
| 543 | $text = $this->parse_span_elements($element['text']); |
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| 544 | |||
| 545 | if ('li' === $context and '' === $markup) { |
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| 546 | if (isset($element['interrupted'])) { |
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| 547 | $markup .= "\n" . '<p>' . $text . '</p>' . "\n"; |
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| 548 | } else { |
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| 549 | $markup .= $text; |
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| 550 | } |
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| 551 | } else { |
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| 552 | $markup .= '<p>' . $text . '</p>' . "\n"; |
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| 553 | } |
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| 554 | |||
| 555 | break; |
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| 556 | |||
| 557 | case 'blockquote': |
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| 558 | |||
| 559 | $text = $this->parse_block_elements($element['lines']); |
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| 560 | |||
| 561 | $markup .= '<blockquote>' . "\n" . $text . '</blockquote>' . "\n"; |
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| 562 | |||
| 563 | break; |
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| 564 | |||
| 565 | case 'code block': |
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| 566 | |||
| 567 | $text = htmlspecialchars($element['text'], ENT_NOQUOTES, 'UTF-8'); |
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| 568 | |||
| 569 | false !== strpos($text, "\x1A\\") and $text = strtr($text, $this->escape_sequence_map); |
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| 570 | |||
| 571 | $markup .= isset($element['language']) ? '<pre><code class="language-' . $element['language'] . '">' . $text . '</code></pre>' : '<pre><code>' . $text . '</code></pre>'; |
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| 572 | |||
| 573 | $markup .= "\n"; |
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| 574 | |||
| 575 | break; |
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| 576 | |||
| 577 | case 'fenced block': |
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| 578 | |||
| 579 | $text = $element['text']; |
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| 580 | |||
| 581 | false !== strpos($text, "\x1A\\") and $text = strtr($text, $this->escape_sequence_map); |
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| 582 | |||
| 583 | $markup .= rex_highlight_string($text, true) . "\n"; |
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| 584 | |||
| 585 | $markup .= "\n"; |
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| 586 | |||
| 587 | break; |
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| 588 | |||
| 589 | case 'heading': |
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| 590 | |||
| 591 | $text = $this->parse_span_elements($element['text']); |
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| 592 | |||
| 593 | $markup .= '<h' . $element['level'] . '>' . $text . '</h' . $element['level'] . '>' . "\n"; |
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| 594 | |||
| 595 | break; |
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| 596 | |||
| 597 | case 'hr': |
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| 598 | |||
| 599 | $markup .= '<hr >' . "\n"; |
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| 600 | |||
| 601 | break; |
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| 602 | |||
| 603 | case 'li': |
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| 604 | |||
| 605 | if (isset($element['ordered'])) { # first |
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| 606 | $list_type = $element['ordered'] ? 'ol' : 'ul'; |
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| 607 | |||
| 608 | $markup .= '<' . $list_type . '>' . "\n"; |
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| 609 | } |
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| 610 | |||
| 611 | if (isset($element['interrupted']) and !isset($element['last'])) { |
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| 612 | $element['lines'] [] = ''; |
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| 613 | } |
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| 614 | |||
| 615 | $text = $this->parse_block_elements($element['lines'], 'li'); |
||
| 616 | |||
| 617 | $markup .= '<li>' . $text . '</li>' . "\n"; |
||
| 618 | |||
| 619 | isset($element['last']) and $markup .= '</' . $list_type . '>' . "\n"; |
||
| 620 | |||
| 621 | break; |
||
| 622 | |||
| 623 | case 'block-level markup': |
||
| 624 | |||
| 625 | $markup .= $element['text'] . "\n"; |
||
| 626 | |||
| 627 | break; |
||
| 628 | |||
| 629 | default: |
||
| 630 | |||
| 631 | $markup .= $element['text'] . "\n"; |
||
| 632 | } |
||
| 633 | } |
||
| 634 | |||
| 635 | return $markup; |
||
| 636 | } |
||
| 637 | |||
| 638 | /** |
||
| 639 | * @param $text |
||
| 640 | * @param array $markers |
||
| 641 | * @return string |
||
| 642 | */ |
||
| 643 | private function parse_span_elements($text, $markers = array('![', '&', '*', '<', '[', '_', '`', 'http', '~~')) |
||
| 907 | } |
||
| 908 | |||
| 909 | # |
||
| 910 | # Read-only |
||
| 911 | # |
||
| 912 | |||
| 913 | private $inline_tags = array( |
||
| 914 | 'a', |
||
| 915 | 'abbr', |
||
| 916 | 'acronym', |
||
| 917 | 'b', |
||
| 918 | 'bdo', |
||
| 919 | 'big', |
||
| 920 | 'br', |
||
| 921 | 'button', |
||
| 922 | 'cite', |
||
| 923 | 'code', |
||
| 924 | 'dfn', |
||
| 925 | 'em', |
||
| 926 | 'i', |
||
| 927 | 'img', |
||
| 928 | 'input', |
||
| 929 | 'kbd', |
||
| 930 | 'label', |
||
| 931 | 'map', |
||
| 932 | 'object', |
||
| 933 | 'q', |
||
| 934 | 'samp', |
||
| 935 | 'script', |
||
| 936 | 'select', |
||
| 937 | 'small', |
||
| 938 | 'span', |
||
| 939 | 'strong', |
||
| 940 | 'sub', |
||
| 941 | 'sup', |
||
| 942 | 'textarea', |
||
| 943 | 'tt', |
||
| 944 | 'var' |
||
| 945 | ); |
||
| 946 | |||
| 947 | # ~ |
||
| 948 | |||
| 949 | private $strong_regex = array( |
||
| 950 | '*' => '/^[*]{2}([^*]+?)[*]{2}(?![*])/s', |
||
| 951 | '_' => '/^__([^_]+?)__(?!_)/s' |
||
| 952 | ); |
||
| 953 | |||
| 954 | private $em_regex = array( |
||
| 955 | '*' => '/^[*]([^*]+?)[*](?![*])/s', |
||
| 956 | '_' => '/^_([^_]+?)[_](?![_])\b/s' |
||
| 957 | ); |
||
| 958 | |||
| 959 | private $strong_em_regex = array( |
||
| 960 | '*' => '/^[*]{2}(.*?)[*](.+?)[*](.*?)[*]{2}/s', |
||
| 961 | '_' => '/^__(.*?)_(.+?)_(.*?)__/s' |
||
| 962 | ); |
||
| 963 | |||
| 964 | private $em_strong_regex = array( |
||
| 965 | '*' => '/^[*](.*?)[*]{2}(.+?)[*]{2}(.*?)[*]/s', |
||
| 966 | '_' => '/^_(.*?)__(.+?)__(.*?)_/s' |
||
| 967 | ); |
||
| 968 | } |
||
| 969 |
Loading history...
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.