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<?php |
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namespace Pilipinews\Common\Converters; |
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use League\HTMLToMarkdown\Converter\ConverterInterface; |
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use League\HTMLToMarkdown\ElementInterface; |
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/** |
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* Paragraph Converter |
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* |
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* @package Pilipinews |
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* @author Rougin Royce Gutib <[email protected]> |
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*/ |
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class ParagraphConverter implements ConverterInterface |
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{ |
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/** |
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* Converts the specified element into a parsed string. |
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* |
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* @param \League\HTMLToMarkdown\ElementInterface $element |
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* @return string |
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*/ |
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public function convert(ElementInterface $element) |
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{ |
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$value = $element->getValue(); |
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$markdown = ''; |
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$lines = preg_split('/\r\n|\r|\n/', $value); |
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foreach ($lines as $line) { |
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/* |
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* Some special characters need to be escaped based on the position that they appear |
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* The following function will deal with those special cases. |
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*/ |
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$markdown .= $this->escapeSpecialCharacters($line); |
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$markdown .= "\n"; |
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} |
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return trim($markdown) !== '' ? "\n" . rtrim(ltrim($markdown)) . "\n" : ''; |
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} |
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/** |
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* Returns the supported HTML tags. |
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* |
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* @return string[] |
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*/ |
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public function getSupportedTags() |
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{ |
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return array('p'); |
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} |
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/** |
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* @param string $line |
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* |
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* @return string |
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*/ |
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private function escapeSpecialCharacters($line) |
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{ |
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$line = $this->escapeFirstCharacters($line); |
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$line = $this->escapeOtherCharacters($line); |
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$line = $this->escapeOtherCharactersRegex($line); |
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return $line; |
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} |
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/** |
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* @param string $line |
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* |
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* @return string |
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*/ |
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private function escapeFirstCharacters($line) |
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{ |
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$escapable = array( |
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'>', |
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'- ', |
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'+ ', |
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'--', |
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'~~~', |
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'---', |
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'- - -' |
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); |
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foreach ($escapable as $i) { |
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if (strpos(ltrim($line), $i) === 0) { |
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// Found a character that must be escaped, adding a backslash before |
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return '\\' . ltrim($line); |
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} |
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} |
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return $line; |
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} |
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/** |
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* @param string $line |
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* |
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* @return string |
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*/ |
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private function escapeOtherCharacters($line) |
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{ |
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$escapable = array( |
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'<!--' |
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); |
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foreach ($escapable as $i) { |
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if (strpos($line, $i) !== false) { |
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// Found an escapable character, escaping it |
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$line = substr_replace($line, '\\', strpos($line, $i), 0); |
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} |
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} |
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return $line; |
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} |
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/** |
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* @param string $line |
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* |
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* @return string |
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*/ |
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private function escapeOtherCharactersRegex($line) |
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{ |
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$regExs = array( |
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// Match numbers ending on ')' or '.' that are at the beginning of the line. |
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'/^[0-9]+(?=\)|\.)/' |
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); |
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foreach ($regExs as $i) { |
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if (preg_match($i, $line, $match)) { |
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// Matched an escapable character, adding a backslash on the string before the offending character |
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$line = substr_replace($line, '\\', strlen($match[0]), 0); |
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} |
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} |
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return $line; |
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} |
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} |
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pilipinews /
common
