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<?php |
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declare(strict_types=1); |
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namespace Hyde\Framework\Actions; |
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use function rtrim; |
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use function str_ends_with; |
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use function str_starts_with; |
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use function substr; |
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use function explode; |
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use function implode; |
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use function array_keys; |
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use function str_replace; |
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use function array_values; |
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use function preg_replace; |
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/** |
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* Converts Markdown to plain text. |
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*/ |
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class ConvertsMarkdownToPlainText |
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{ |
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protected const ATX_HEADERS = ['/^(\n)?\s{0,}#{1,6}\s+| {0,}(\n)?\s{0,}#{0,} {0,}(\n)?\s{0,}$/m' => '$1$2$3']; |
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protected const SETEXT_HEADERS = ['/\n={2,}/' => "\n"]; |
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protected const HORIZONTAL_RULES = ['/^(-\s*?|\*\s*?|_\s*?){3,}\s*/m' => '']; |
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protected const HTML_TAGS = ['/<[^>]*>/' => '']; |
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protected const CODE_BLOCKS = ['/(`{3,})(.*?)\1/m' => '$2']; |
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protected const FENCED_CODEBLOCKS = ['/`{3}.*\n/' => '', '/`{3}/' => '']; |
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protected const TILDE_FENCED_CODEBLOCKS = ['/~{3}.*\n/' => '', '/~{3}/' => '']; |
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protected const INLINE_CODE = ['/`(.+?)`/' => '$1']; |
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protected const IMAGES = ['/\!\[(.*?)\][\[\(].*?[\]\)]/' => '$1']; |
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protected const INLINE_LINKS = ['/\[(.*?)\][\[\(].*?[\]\)]/' => '$1']; |
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protected const REFERENCE_LINKS = ['/^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$/' => '']; |
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protected const STRIKETHROUGH = ['/~~/' => '']; |
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protected const BLOCKQUOTES = ['/^\s{0,3}>\s?/' => '']; |
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protected const FOOTNOTES = ['/\[\^.+?\](\: .*?$)?/' => '']; |
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protected const EMPHASIS = ['/([\*_]{1,3})(\S.*?\S{0,1})\1/' => '$2']; |
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/** Emphasis (repeat the line to remove double emphasis) */ |
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protected const DOUBLE_EMPHASIS = self::EMPHASIS; |
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/** Replace two or more newlines with exactly two */ |
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protected const REPEATED_NEWLINES = ['/\n{2,}/' => "\n\n"]; |
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protected string $markdown; |
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public function __construct(string $markdown) |
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{ |
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$this->markdown = $markdown; |
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} |
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/** |
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* Regex based on https://github.com/stiang/remove-markdown, licensed under MIT. |
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*/ |
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public function execute(): string |
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{ |
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return $this->applyStringTransformations($this->applyRegexTransformations($this->markdown)); |
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} |
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protected function applyRegexTransformations(string $markdown): string |
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{ |
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/** @var array<array-key, array<string, string>> $patterns */ |
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$patterns = [ |
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static::ATX_HEADERS, |
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static::SETEXT_HEADERS, |
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static::HORIZONTAL_RULES, |
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static::HTML_TAGS, |
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static::CODE_BLOCKS, |
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static::FENCED_CODEBLOCKS, |
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static::TILDE_FENCED_CODEBLOCKS, |
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static::INLINE_CODE, |
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static::IMAGES, |
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static::INLINE_LINKS, |
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static::REFERENCE_LINKS, |
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static::STRIKETHROUGH, |
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static::BLOCKQUOTES, |
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static::FOOTNOTES, |
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static::EMPHASIS, |
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static::DOUBLE_EMPHASIS, |
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static::REPEATED_NEWLINES, |
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]; |
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foreach ($patterns as $pattern) { |
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$markdown = preg_replace(array_keys($pattern), array_values($pattern), $markdown) ?? $markdown; |
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} |
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return $markdown; |
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} |
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protected function applyStringTransformations(string $markdown): string |
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{ |
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$lines = explode("\n", $markdown); |
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foreach ($lines as $line => $contents) { |
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$contents = $this->removeTables($contents); |
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$contents = $this->removeBlockquotes($contents); |
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$contents = $this->trimWhitespace($contents); |
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$lines[$line] = $contents; |
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} |
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return implode("\n", $lines); |
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} |
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protected function removeTables(string $contents): string |
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{ |
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// Remove dividers |
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if (str_starts_with($contents, '|--') && str_ends_with($contents, '--|')) { |
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$contents = str_replace(['|', '-'], ['', ''], $contents); |
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} |
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// Remove cells |
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if (str_starts_with($contents, '| ') && str_ends_with($contents, '|')) { |
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$contents = rtrim(str_replace(['| ', ' | ', ' |'], ['', '', ''], $contents), ' '); |
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} |
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return $contents; |
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} |
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protected function removeBlockquotes(string $contents): string |
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{ |
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// Remove blockquotes |
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if (str_starts_with($contents, '> ')) { |
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$contents = substr($contents, 2); |
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} |
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// Remove multiline blockquotes |
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if (str_starts_with($contents, '>')) { |
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$contents = substr($contents, 1); |
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} |
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return $contents; |
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} |
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protected function trimWhitespace(string $contents): string |
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{ |
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// If it is a list, don't trim the whitespace |
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$firstCharacter = substr(trim($contents), 0, 1); |
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if ($firstCharacter === '-' || $firstCharacter === '*' || $firstCharacter === '+' || is_numeric($firstCharacter)) { |
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return $contents; |
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} |
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return trim($contents); |
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} |
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} |
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hydephp /
develop
