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OneFile
源码
parsedown一个小而美的 PHP 的 Markdown 解析库
作者 Emanuil Rusev·主语言 PHP·无依赖·9.4k 次查看
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<?php # # # Parsedown # http://parsedown.org # # (c) Emanuil Rusev # http://erusev.com # # For the full license information, view the LICENSE file that was distributed # with this source code. # # class Parsedown { # ~ const version = '1.8.0-beta-7'; # ~ function text($text) { $Elements = $this->textElements($text); # convert to markup $markup = $this->elements($Elements); # trim line breaks $markup = trim($markup, "\n"); return $markup; } protected function textElements($text) { # make sure no definitions are set $this->DefinitionData = array(); # standardize line breaks $text = str_replace(array("\r\n", "\r"), "\n", $text); # remove surrounding line breaks $text = trim($text, "\n"); # split text into lines $lines = explode("\n", $text); # iterate through lines to identify blocks return $this->linesElements($lines); } # # Setters # function setBreaksEnabled($breaksEnabled) { $this->breaksEnabled = $breaksEnabled; return $this; } protected $breaksEnabled; function setMarkupEscaped($markupEscaped) { $this->markupEscaped = $markupEscaped; return $this; } protected $markupEscaped; function setUrlsLinked($urlsLinked) { $this->urlsLinked = $urlsLinked; return $this; } protected $urlsLinked = true; function setSafeMode($safeMode) { $this->safeMode = (bool) $safeMode; return $this; } protected $safeMode; function setStrictMode($strictMode) { $this->strictMode = (bool) $strictMode; return $this; } protected $strictMode; protected $safeLinksWhitelist = array( 'http://', 'https://', 'ftp://', 'ftps://', 'mailto:', 'tel:', 'data:image/png;base64,', 'data:image/gif;base64,', 'data:image/jpeg;base64,', 'irc:', 'ircs:', 'git:', 'ssh:', 'news:', 'steam:', ); # # Lines # protected $BlockTypes = array( '#' => array('Header'), '*' => array('Rule', 'List'), '+' => array('List'), '-' => array('SetextHeader', 'Table', 'Rule', 'List'), '0' => array('List'), '1' => array('List'), '2' => array('List'), '3' => array('List'), '4' => array('List'), '5' => array('List'), '6' => array('List'), '7' => array('List'), '8' => array('List'), '9' => array('List'), ':' => array('Table'), '<' => array('Comment', 'Markup'), '=' => array('SetextHeader'), '>' => array('Quote'), '[' => array('Reference'), '_' => array('Rule'), '`' => array('FencedCode'), '|' => array('Table'), '~' => array('FencedCode'), ); # ~ protected $unmarkedBlockTypes = array( 'Code', ); # # Blocks # protected function lines(array $lines) { return $this->elements($this->linesElements($lines)); } protected function linesElements(array $lines) { $Elements = array(); $CurrentBlock = null; foreach ($lines as $line) { if (chop($line) === '') { if (isset($CurrentBlock)) { $CurrentBlock['interrupted'] = (isset($CurrentBlock['interrupted']) ? $CurrentBlock['interrupted'] + 1 : 1 ); } continue; } while (($beforeTab = strstr($line, "\t", true)) !== false) { $shortage = 4 - mb_strlen($beforeTab, 'utf-8') % 4; $line = $beforeTab . str_repeat(' ', $shortage) . substr($line, strlen($beforeTab) + 1) ; } $indent = strspn($line, ' '); $text = $indent > 0 ? substr($line, $indent) : $line; # ~ $Line = array('body' => $line, 'indent' => $indent, 'text' => $text); # ~ if (isset($CurrentBlock['continuable'])) { $methodName = 'block' . $CurrentBlock['type'] . 'Continue'; $Block = $this->$methodName($Line, $CurrentBlock); if (isset($Block)) { $CurrentBlock = $Block; continue; } else { if ($this->isBlockCompletable($CurrentBlock['type'])) { $methodName = 'block' . $CurrentBlock['type'] . 'Complete'; $CurrentBlock = $this->$methodName($CurrentBlock); } } } # ~ $marker = $text[0]; # ~ $blockTypes = $this->unmarkedBlockTypes; if (isset($this->BlockTypes[$marker])) { foreach ($this->BlockTypes[$marker] as $blockType) { $blockTypes []= $blockType; } } # # ~ foreach ($blockTypes as $blockType) { $Block = $this->{"block$blockType"}($Line, $CurrentBlock); if (isset($Block)) { $Block['type'] = $blockType; if ( ! isset($Block['identified'])) { if (isset($CurrentBlock)) { $Elements[] = $this->extractElement($CurrentBlock); } $Block['identified'] = true; } if ($this->isBlockContinuable($blockType)) { $Block['continuable'] = true; } $CurrentBlock = $Block; continue 2; } } # ~ if (isset($CurrentBlock) and $CurrentBlock['type'] === 'Paragraph') { $Block = $this->paragraphContinue($Line, $CurrentBlock); } if (isset($Block)) { $CurrentBlock = $Block; } else { if (isset($CurrentBlock)) { $Elements[] = $this->extractElement($CurrentBlock); } $CurrentBlock = $this->paragraph($Line); $CurrentBlock['identified'] = true; } } # ~ if (isset($CurrentBlock['continuable']) and $this->isBlockCompletable($CurrentBlock['type'])) { $methodName = 'block' . $CurrentBlock['type'] . 'Complete'; $CurrentBlock = $this->$methodName($CurrentBlock); } # ~ if (isset($CurrentBlock)) { $Elements[] = $this->extractElement($CurrentBlock); } # ~ return $Elements; } protected function extractElement(array $Component) { if ( ! isset($Component['element'])) { if (isset($Component['markup'])) { $Component['element'] = array('rawHtml' => $Component['markup']); } elseif (isset($Component['hidden'])) { $Component['element'] = array(); } } return $Component['element']; } protected function isBlockContinuable($Type) { return method_exists($this, 'block' . $Type . 'Continue'); } protected function isBlockCompletable($Type) { return method_exists($this, 'block' . $Type . 'Complete'); } # # Code protected function blockCode($Line, $Block = null) { if (isset($Block) and $Block['type'] === 'Paragraph' and ! isset($Block['interrupted'])) { return; } if ($Line['indent'] >= 4) { $text = substr($Line['body'], 4); $Block = array( 'element' => array( 'name' => 'pre', 'element' => array( 'name' => 'code', 'text' => $text, ), ), ); return $Block; } } protected function blockCodeContinue($Line, $Block) { if ($Line['indent'] >= 4) { if (isset($Block['interrupted'])) { $Block['element']['element']['text'] .= str_repeat("\n", $Block['interrupted']); unset($Block['interrupted']); } $Block['element']['element']['text'] .= "\n"; $text = substr($Line['body'], 4); $Block['element']['element']['text'] .= $text; return $Block; } } protected function blockCodeComplete($Block) { return $Block; } # # Comment protected function blockComment($Line) { if ($this->markupEscaped or $this->safeMode) { return; } if (strpos($Line['text'], '<!--') === 0) { $Block = array( 'element' => array( 'rawHtml' => $Line['body'], 'autobreak' => true, ), ); if (strpos($Line['text'], '-->') !== false) { $Block['closed'] = true; } return $Block; } } protected function blockCommentContinue($Line, array $Block) { if (isset($Block['closed'])) { return; } $Block['element']['rawHtml'] .= "\n" . $Line['body']; if (strpos($Line['text'], '-->') !== false) { $Block['closed'] = true; } return $Block; } # # Fenced Code protected function blockFencedCode($Line) { $marker = $Line['text'][0]; $openerLength = strspn($Line['text'], $marker); if ($openerLength < 3) { return; } $infostring = trim(substr($Line['text'], $openerLength), "\t "); if (strpos($infostring, '`') !== false) { return; } $Element = array( 'name' => 'code', 'text' => '', ); if ($infostring !== '') { /** * https://www.w3.org/TR/2011/WD-html5-20110525/elements.html#classes * Every HTML element may have a class attribute specified. * The attribute, if specified, must have a value that is a set * of space-separated tokens representing the various classes * that the element belongs to. * [...] * The space characters, for the purposes of this specification, * are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab), * U+000A LINE FEED (LF), U+000C FORM FEED (FF), and * U+000D CARRIAGE RETURN (CR). */ $language = substr($infostring, 0, strcspn($infostring, " \t\n\f\r")); $Element['attributes'] = array('class' => "language-$language"); } $Block = array( 'char' => $marker, 'openerLength' => $openerLength, 'element' => array( 'name' => 'pre', 'element' => $Element, ), ); return $Block; } protected function blockFencedCodeContinue($Line, $Block) { if (isset($Block['complete'])) { return; } if (isset($Block['interrupted'])) { $Block['element']['element']['text'] .= str_repeat("\n", $Block['interrupted']); unset($Block['interrupted']); } if (($len = strspn($Line['text'], $Block['char'])) >= $Block['openerLength'] and chop(substr($Line['text'], $len), ' ') === '' ) { $Block['element']['element']['text'] = substr($Block['element']['element']['text'], 1); $Block['complete'] = true; return $Block; } $Block['element']['element']['text'] .= "\n" . $Line['body']; return $Block; } protected function blockFencedCodeComplete($Block) { return $Block; } # # Header protected function blockHeader($Line) { $level = strspn($Line['text'], '#'); if ($level > 6) { return; } $text = trim($Line['text'], '#'); if ($this->strictMode and isset($text[0]) and $text[0] !== ' ') { return; } $text = trim($text, ' '); $Block = array( 'element' => array( 'name' => 'h' . $level, 'handler' => array( 'function' => 'lineElements', 'argument' => $text, 'destination' => 'elements', ) ), ); return $Block; } # # List protected function blockList($Line, array $CurrentBlock = null) { list($name, $pattern) = $Line['text'][0] <= '-' ? array('ul', '[*+-]') : array('ol', '[0-9]{1,9}+[.\)]'); if (preg_match('/^('.$pattern.'([ ]++|$))(.*+)/', $Line['text'], $matches)) { $contentIndent = strlen($matches[2]); if ($contentIndent >= 5) { $contentIndent -= 1; $matches[1] = substr($matches[1], 0, -$contentIndent); $matches[3] = str_repeat(' ', $contentIndent) . $matches[3]; } elseif ($contentIndent === 0) { $matches[1] .= ' '; } $markerWithoutWhitespace = strstr($matches[1], ' ', true); $Block = array( 'indent' => $Line['indent'], 'pattern' => $pattern, 'data' => array( 'type' => $name, 'marker' => $matches[1], 'markerType' => ($name === 'ul' ? $markerWithoutWhitespace : substr($markerWithoutWhitespace, -1)), ), 'element' => array( 'name' => $name, 'elements' => array(), ), ); $Block['data']['markerTypeRegex'] = preg_quote($Block['data']['markerType'], '/'); if ($name === 'ol') { $listStart = ltrim(strstr($matches[1], $Block['data']['markerType'], true), '0') ?: '0'; if ($listStart !== '1') { if ( isset($CurrentBlock) and $CurrentBlock['type'] === 'Paragraph' and ! isset($CurrentBlock['interrupted']) ) { return; } $Block['element']['attributes'] = array('start' => $listStart); } } $Block['li'] = array( 'name' => 'li', 'handler' => array( 'function' => 'li', 'argument' => !empty($matches[3]) ? array($matches[3]) : array(), 'destination' => 'elements' ) ); $Block['element']['elements'] []= & $Block['li']; return $Block; } } protected function blockListContinue($Line, array $Block) { if (isset($Block['interrupted']) and empty($Block['li']['handler']['argument'])) { return null; } $requiredIndent = ($Block['indent'] + strlen($Block['data']['marker'])); if ($Line['indent'] < $requiredIndent and ( ( $Block['data']['type'] === 'ol' and preg_match('/^[0-9]++'.$Block['data']['markerTypeRegex'].'(?:[ ]++(.*)|$)/', $Line['text'], $matches) ) or ( $Block['data']['type'] === 'ul' and preg_match('/^'.$Block['data']['markerTypeRegex'].'(?:[ ]++(.*)|$)/', $Line['text'], $matches) ) ) ) { if (isset($Block['interrupted'])) { $Block['li']['handler']['argument'] []= ''; $Block['loose'] = true; unset($Block['interrupted']); } unset($Block['li']); $text = isset($matches[1]) ? $matches[1] : ''; $Block['indent'] = $Line['indent']; $Block['li'] = array( 'name' => 'li', 'handler' => array( 'function' => 'li', 'argument' => array($text), 'destination' => 'elements' ) ); $Block['element']['elements'] []= & $Block['li']; return $Block; } elseif ($Line['indent'] < $requiredIndent and $this->blockList($Line)) { return null; } if ($Line['text'][0] === '[' and $this->blockReference($Line)) { return $Block; } if ($Line['indent'] >= $requiredIndent) { if (isset($Block['interrupted'])) { $Block['li']['handler']['argument'] []= ''; $Block['loose'] = true; unset($Block['interrupted']); } $text = substr($Line['body'], $requiredIndent); $Block['li']['handler']['argument'] []= $text; return $Block; } if ( ! isset($Block['interrupted'])) { $text = preg_replace('/^[ ]{0,'.$requiredIndent.'}+/', '', $Line['body']); $Block['li']['handler']['argument'] []= $text; return $Block; } } protected function blockListComplete(array $Block) { if (isset($Block['loose'])) { foreach ($Block['element']['elements'] as &$li) { if (end($li['handler']['argument']) !== '') { $li['handler']['argument'] []= ''; } } } return $Block; } # # Quote protected function blockQuote($Line) { if (preg_match('/^>[ ]?+(.*+)/', $Line['text'], $matches)) { $Block = array( 'element' => array( 'name' => 'blockquote', 'handler' => array( 'function' => 'linesElements', 'argument' => (array) $matches[1], 'destination' => 'elements', ) ), ); return $Block; } } protected function blockQuoteContinue($Line, array $Block) { if (isset($Block['interrupted'])) { return; } if ($Line['text'][0] === '>' and preg_match('/^>[ ]?+(.*+)/', $Line['text'], $matches)) { $Block['element']['handler']['argument'] []= $matches[1]; return $Block; } if ( ! isset($Block['interrupted'])) { $Block['element']['handler']['argument'] []= $Line['text']; return $Block; } } # # Rule protected function blockRule($Line) { $marker = $Line['text'][0]; if (substr_count($Line['text'], $marker) >= 3 and chop($Line['text'], " $marker") === '') { $Block = array( 'element' => array( 'name' => 'hr', ), ); return $Block; } } # # Setext protected function blockSetextHeader($Line, array $Block = null) { if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted'])) { return; } if ($Line['indent'] < 4 and chop(chop($Line['text'], ' '), $Line['text'][0]) === '') { $Block['element']['name'] = $Line['text'][0] === '=' ? 'h1' : 'h2'; return $Block; } } # # Markup protected function blockMarkup($Line) { if ($this->markupEscaped or $this->safeMode) { return; } if (preg_match('/^<[\/]?+(\w*)(?:[ ]*+'.$this->regexHtmlAttribute.')*+[ ]*+(\/)?>/', $Line['text'], $matches)) { $element = strtolower($matches[1]); if (in_array($element, $this->textLevelElements)) { return; } $Block = array( 'name' => $matches[1], 'element' => array( 'rawHtml' => $Line['text'], 'autobreak' => true, ), ); return $Block; } } protected function blockMarkupContinue($Line, array $Block) { if (isset($Block['closed']) or isset($Block['interrupted'])) { return; } $Block['element']['rawHtml'] .= "\n" . $Line['body']; return $Block; } # # Reference protected function blockReference($Line) { if (strpos($Line['text'], ']') !== false and preg_match('/^\[(.+?)\]:[ ]*+<?(\S+?)>?(?:[ ]+["\'(](.+)["\')])?[ ]*+$/', $Line['text'], $matches) ) { $id = strtolower($matches[1]); $Data = array( 'url' => $matches[2], 'title' => isset($matches[3]) ? $matches[3] : null, ); $this->DefinitionData['Reference'][$id] = $Data; $Block = array( 'element' => array(), ); return $Block; } } # # Table protected function blockTable($Line, array $Block = null) { if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted'])) { return; } if ( strpos($Block['element']['handler']['argument'], '|') === false and strpos($Line['text'], '|') === false and strpos($Line['text'], ':') === false or strpos($Block['element']['handler']['argument'], "\n") !== false ) { return; } if (chop($Line['text'], ' -:|') !== '') { return; } $alignments = array(); $divider = $Line['text']; $divider = trim($divider); $divider = trim($divider, '|'); $dividerCells = explode('|', $divider); foreach ($dividerCells as $dividerCell) { $dividerCell = trim($dividerCell); if ($dividerCell === '') { return; } $alignment = null; if ($dividerCell[0] === ':') { $alignment = 'left'; } if (substr($dividerCell, - 1) === ':') { $alignment = $alignment === 'left' ? 'center' : 'right'; } $alignments []= $alignment; } # ~ $HeaderElements = array(); $header = $Block['element']['handler']['argument']; $header = trim($header); $header = trim($header, '|'); $headerCells = explode('|', $header); if (count($headerCells) !== count($alignments)) { return; } foreach ($headerCells as $index => $headerCell) { $headerCell = trim($headerCell); $HeaderElement = array( 'name' => 'th', 'handler' => array( 'function' => 'lineElements', 'argument' => $headerCell, 'destination' => 'elements', ) ); if (isset($alignments[$index])) { $alignment = $alignments[$index]; $HeaderElement['attributes'] = array( 'style' => "text-align: $alignment;", ); } $HeaderElements []= $HeaderElement; } # ~ $Block = array( 'alignments' => $alignments, 'identified' => true, 'element' => array( 'name' => 'table', 'elements' => array(), ), ); $Block['element']['elements'] []= array( 'name' => 'thead', ); $Block['element']['elements'] []= array( 'name' => 'tbody', 'elements' => array(), ); $Block['element']['elements'][0]['elements'] []= array( 'name' => 'tr', 'elements' => $HeaderElements, ); return $Block; } protected function blockTableContinue($Line, array $Block) { if (isset($Block['interrupted'])) { return; } if (count($Block['alignments']) === 1 or $Line['text'][0] === '|' or strpos($Line['text'], '|')) { $Elements = array(); $row = $Line['text']; $row = trim($row); $row = trim($row, '|'); preg_match_all('/(?:(\\\\[|])|[^|`]|`[^`]++`|`)++/', $row, $matches); $cells = array_slice($matches[0], 0, count($Block['alignments'])); foreach ($cells as $index => $cell) { $cell = trim($cell); $Element = array( 'name' => 'td', 'handler' => array( 'function' => 'lineElements', 'argument' => $cell, 'destination' => 'elements', ) ); if (isset($Block['alignments'][$index])) { $Element['attributes'] = array( 'style' => 'text-align: ' . $Block['alignments'][$index] . ';', ); } $Elements []= $Element; } $Element = array( 'name' => 'tr', 'elements' => $Elements, ); $Block['element']['elements'][1]['elements'] []= $Element; return $Block; } } # # ~ # protected function paragraph($Line) { return array( 'type' => 'Paragraph', 'element' => array( 'name' => 'p', 'handler' => array( 'function' => 'lineElements', 'argument' => $Line['text'], 'destination' => 'elements', ), ), ); } protected function paragraphContinue($Line, array $Block) { if (isset($Block['interrupted'])) { return; } $Block['element']['handler']['argument'] .= "\n".$Line['text']; return $Block; } # # Inline Elements # protected $InlineTypes = array( '!' => array('Image'), '&' => array('SpecialCharacter'), '*' => array('Emphasis'), ':' => array('Url'), '<' => array('UrlTag', 'EmailTag', 'Markup'), '[' => array('Link'), '_' => array('Emphasis'), '`' => array('Code'), '~' => array('Strikethrough'), '\\' => array('EscapeSequence'), ); # ~ protected $inlineMarkerList = '!*_&[:<`~\\'; # # ~ # public function line($text, $nonNestables = array()) { return $this->elements($this->lineElements($text, $nonNestables)); } protected function lineElements($text, $nonNestables = array()) { # standardize line breaks $text = str_replace(array("\r\n", "\r"), "\n", $text); $Elements = array(); $nonNestables = (empty($nonNestables) ? array() : array_combine($nonNestables, $nonNestables) ); # $excerpt is based on the first occurrence of a marker while ($excerpt = strpbrk($text, $this->inlineMarkerList)) { $marker = $excerpt[0]; $markerPosition = strlen($text) - strlen($excerpt); $Excerpt = array('text' => $excerpt, 'context' => $text); foreach ($this->InlineTypes[$marker] as $inlineType) { # check to see if the current inline type is nestable in the current context if (isset($nonNestables[$inlineType])) { continue; } $Inline = $this->{"inline$inlineType"}($Excerpt); if ( ! isset($Inline)) { continue; } # makes sure that the inline belongs to "our" marker if (isset($Inline['position']) and $Inline['position'] > $markerPosition) { continue; } # sets a default inline position if ( ! isset($Inline['position'])) { $Inline['position'] = $markerPosition; } # cause the new element to 'inherit' our non nestables $Inline['element']['nonNestables'] = isset($Inline['element']['nonNestables']) ? array_merge($Inline['element']['nonNestables'], $nonNestables) : $nonNestables ; # the text that comes before the inline $unmarkedText = substr($text, 0, $Inline['position']); # compile the unmarked text $InlineText = $this->inlineText($unmarkedText); $Elements[] = $InlineText['element']; # compile the inline $Elements[] = $this->extractElement($Inline); # remove the examined text $text = substr($text, $Inline['position'] + $Inline['extent']); continue 2; } # the marker does not belong to an inline $unmarkedText = substr($text, 0, $markerPosition + 1); $InlineText = $this->inlineText($unmarkedText); $Elements[] = $InlineText['element']; $text = substr($text, $markerPosition + 1); } $InlineText = $this->inlineText($text); $Elements[] = $InlineText['element']; foreach ($Elements as &$Element) { if ( ! isset($Element['autobreak'])) { $Element['autobreak'] = false; } } return $Elements; } # # ~ # protected function inlineText($text) { $Inline = array( 'extent' => strlen($text), 'element' => array(), ); $Inline['element']['elements'] = self::pregReplaceElements( $this->breaksEnabled ? '/[ ]*+\n/' : '/(?:[ ]*+\\\\|[ ]{2,}+)\n/', array( array('name' => 'br'), array('text' => "\n"), ), $text ); return $Inline; } protected function inlineCode($Excerpt) { $marker = $Excerpt['text'][0]; if (preg_match('/^(['.$marker.']++)[ ]*+(.+?)[ ]*+(?<!['.$marker.'])\1(?!'.$marker.')/s', $Excerpt['text'], $matches)) { $text = $matches[2]; $text = preg_replace('/[ ]*+\n/', ' ', $text); return array( 'extent' => strlen($matches[0]), 'element' => array( 'name' => 'code', 'text' => $text, ), ); } } protected function inlineEmailTag($Excerpt) { $hostnameLabel = '[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?'; $commonMarkEmail = '[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]++@' . $hostnameLabel . '(?:\.' . $hostnameLabel . ')*'; if (strpos($Excerpt['text'], '>') !== false and preg_match("/^<((mailto:)?$commonMarkEmail)>/i", $Excerpt['text'], $matches) ){ $url = $matches[1]; if ( ! isset($matches[2])) { $url = "mailto:$url"; } return array( 'extent' => strlen($matches[0]), 'element' => array( 'name' => 'a', 'text' => $matches[1], 'attributes' => array( 'href' => $url, ), ), ); } } protected function inlineEmphasis($Excerpt) { if ( ! isset($Excerpt['text'][1])) { return; } $marker = $Excerpt['text'][0]; if ($Excerpt['text'][1] === $marker and preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches)) { $emphasis = 'strong'; } elseif (preg_match($this->EmRegex[$marker], $Excerpt['text'], $matches)) { $emphasis = 'em'; } else { return; } return array( 'extent' => strlen($matches[0]), 'element' => array( 'name' => $emphasis, 'handler' => array( 'function' => 'lineElements', 'argument' => $matches[1], 'destination' => 'elements', ) ), ); } protected function inlineEscapeSequence($Excerpt) { if (isset($Excerpt['text'][1]) and in_array($Excerpt['text'][1], $this->specialCharacters)) { return array( 'element' => array('rawHtml' => $Excerpt['text'][1]), 'extent' => 2, ); } } protected function inlineImage($Excerpt) { if ( ! isset($Excerpt['text'][1]) or $Excerpt['text'][1] !== '[') { return; } $Excerpt['text']= substr($Excerpt['text'], 1); $Link = $this->inlineLink($Excerpt); if ($Link === null) { return; } $Inline = array( 'extent' => $Link['extent'] + 1, 'element' => array( 'name' => 'img', 'attributes' => array( 'src' => $Link['element']['attributes']['href'], 'alt' => $Link['element']['handler']['argument'], ), 'autobreak' => true, ), ); $Inline['element']['attributes'] += $Link['element']['attributes']; unset($Inline['element']['attributes']['href']); return $Inline; } protected function inlineLink($Excerpt) { $Element = array( 'name' => 'a', 'handler' => array( 'function' => 'lineElements', 'argument' => null, 'destination' => 'elements', ), 'nonNestables' => array('Url', 'Link'), 'attributes' => array( 'href' => null, 'title' => null, ), ); $extent = 0; $remainder = $Excerpt['text']; if (preg_match('/\[((?:[^][]++|(?R))*+)\]/', $remainder, $matches)) { $Element['handler']['argument'] = $matches[1]; $extent += strlen($matches[0]); $remainder = substr($remainder, $extent); } else { return; } if (preg_match('/^[(]\s*+((?:[^ ()]++|[(][^ )]+[)])++)(?:[ ]+("[^"]*+"|\'[^\']*+\'))?\s*+[)]/', $remainder, $matches)) { $Element['attributes']['href'] = $matches[1]; if (isset($matches[2])) { $Element['attributes']['title'] = substr($matches[2], 1, - 1); } $extent += strlen($matches[0]); } else { if (preg_match('/^\s*\[(.*?)\]/', $remainder, $matches)) { $definition = strlen($matches[1]) ? $matches[1] : $Element['handler']['argument']; $definition = strtolower($definition); $extent += strlen($matches[0]); } else { $definition = strtolower($Element['handler']['argument']); } if ( ! isset($this->DefinitionData['Reference'][$definition])) { return; } $Definition = $this->DefinitionData['Reference'][$definition]; $Element['attributes']['href'] = $Definition['url']; $Element['attributes']['title'] = $Definition['title']; } return array( 'extent' => $extent, 'element' => $Element, ); } protected function inlineMarkup($Excerpt) { if ($this->markupEscaped or $this->safeMode or strpos($Excerpt['text'], '>') === false) { return; } if ($Excerpt['text'][1] === '/' and preg_match('/^<\/\w[\w-]*+[ ]*+>/s', $Excerpt['text'], $matches)) { return array( 'element' => array('rawHtml' => $matches[0]), 'extent' => strlen($matches[0]), ); } if ($Excerpt['text'][1] === '!' and preg_match('/^<!---?[^>-](?:-?+[^-])*-->/s', $Excerpt['text'], $matches)) { return array( 'element' => array('rawHtml' => $matches[0]), 'extent' => strlen($matches[0]), ); } if ($Excerpt['text'][1] !== ' ' and preg_match('/^<\w[\w-]*+(?:[ ]*+'.$this->regexHtmlAttribute.')*+[ ]*+\/?>/s', $Excerpt['text'], $matches)) { return array( 'element' => array('rawHtml' => $matches[0]), 'extent' => strlen($matches[0]), ); } } protected function inlineSpecialCharacter($Excerpt) { if (substr($Excerpt['text'], 1, 1) !== ' ' and strpos($Excerpt['text'], ';') !== false and preg_match('/^&(#?+[0-9a-zA-Z]++);/', $Excerpt['text'], $matches) ) { return array( 'element' => array('rawHtml' => '&' . $matches[1] . ';'), 'extent' => strlen($matches[0]), ); } return; } protected function inlineStrikethrough($Excerpt) { if ( ! isset($Excerpt['text'][1])) { return; } if ($Excerpt['text'][1] === '~' and preg_match('/^~~(?=\S)(.+?)(?<=\S)~~/', $Excerpt['text'], $matches)) { return array( 'extent' => strlen($matches[0]), 'element' => array( 'name' => 'del', 'handler' => array( 'function' => 'lineElements', 'argument' => $matches[1], 'destination' => 'elements', ) ), ); } } protected function inlineUrl($Excerpt) { if ($this->urlsLinked !== true or ! isset($Excerpt['text'][2]) or $Excerpt['text'][2] !== '/') { return; } if (strpos($Excerpt['context'], 'http') !== false and preg_match('/\bhttps?+:[\/]{2}[^\s<]+\b\/*+/ui', $Excerpt['context'], $matches, PREG_OFFSET_CAPTURE) ) { $url = $matches[0][0]; $Inline = array( 'extent' => strlen($matches[0][0]), 'position' => $matches[0][1], 'element' => array( 'name' => 'a', 'text' => $url, 'attributes' => array( 'href' => $url, ), ), ); return $Inline; } } protected function inlineUrlTag($Excerpt) { if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<(\w++:\/{2}[^ >]++)>/i', $Excerpt['text'], $matches)) { $url = $matches[1]; return array( 'extent' => strlen($matches[0]), 'element' => array( 'name' => 'a', 'text' => $url, 'attributes' => array( 'href' => $url, ), ), ); } } # ~ protected function unmarkedText($text) { $Inline = $this->inlineText($text); return $this->element($Inline['element']); } # # Handlers # protected function handle(array $Element) { if (isset($Element['handler'])) { if (!isset($Element['nonNestables'])) { $Element['nonNestables'] = array(); } if (is_string($Element['handler'])) { $function = $Element['handler']; $argument = $Element['text']; unset($Element['text']); $destination = 'rawHtml'; } else { $function = $Element['handler']['function']; $argument = $Element['handler']['argument']; $destination = $Element['handler']['destination']; } $Element[$destination] = $this->{$function}($argument, $Element['nonNestables']); if ($destination === 'handler') { $Element = $this->handle($Element); } unset($Element['handler']); } return $Element; } protected function handleElementRecursive(array $Element) { return $this->elementApplyRecursive(array($this, 'handle'), $Element); } protected function handleElementsRecursive(array $Elements) { return $this->elementsApplyRecursive(array($this, 'handle'), $Elements); } protected function elementApplyRecursive($closure, array $Element) { $Element = call_user_func($closure, $Element); if (isset($Element['elements'])) { $Element['elements'] = $this->elementsApplyRecursive($closure, $Element['elements']); } elseif (isset($Element['element'])) { $Element['element'] = $this->elementApplyRecursive($closure, $Element['element']); } return $Element; } protected function elementApplyRecursiveDepthFirst($closure, array $Element) { if (isset($Element['elements'])) { $Element['elements'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['elements']); } elseif (isset($Element['element'])) { $Element['element'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['element']); } $Element = call_user_func($closure, $Element); return $Element; } protected function elementsApplyRecursive($closure, array $Elements) { foreach ($Elements as &$Element) { $Element = $this->elementApplyRecursive($closure, $Element); } return $Elements; } protected function elementsApplyRecursiveDepthFirst($closure, array $Elements) { foreach ($Elements as &$Element) { $Element = $this->elementApplyRecursiveDepthFirst($closure, $Element); } return $Elements; } protected function element(array $Element) { if ($this->safeMode) { $Element = $this->sanitiseElement($Element); } # identity map if element has no handler $Element = $this->handle($Element); $hasName = isset($Element['name']); $markup = ''; if ($hasName) { $markup .= '<' . $Element['name']; if (isset($Element['attributes'])) { foreach ($Element['attributes'] as $name => $value) { if ($value === null) { continue; } $markup .= " $name=\"".self::escape($value).'"'; } } } $permitRawHtml = false; if (isset($Element['text'])) { $text = $Element['text']; } // very strongly consider an alternative if you're writing an // extension elseif (isset($Element['rawHtml'])) { $text = $Element['rawHtml']; $allowRawHtmlInSafeMode = isset($Element['allowRawHtmlInSafeMode']) && $Element['allowRawHtmlInSafeMode']; $permitRawHtml = !$this->safeMode || $allowRawHtmlInSafeMode; } $hasContent = isset($text) || isset($Element['element']) || isset($Element['elements']); if ($hasContent) { $markup .= $hasName ? '>' : ''; if (isset($Element['elements'])) { $markup .= $this->elements($Element['elements']); } elseif (isset($Element['element'])) { $markup .= $this->element($Element['element']); } else { if (!$permitRawHtml) { $markup .= self::escape($text, true); } else { $markup .= $text; } } $markup .= $hasName ? '</' . $Element['name'] . '>' : ''; } elseif ($hasName) { $markup .= ' />'; } return $markup; } protected function elements(array $Elements) { $markup = ''; $autoBreak = true; foreach ($Elements as $Element) { if (empty($Element)) { continue; } $autoBreakNext = (isset($Element['autobreak']) ? $Element['autobreak'] : isset($Element['name']) ); // (autobreak === false) covers both sides of an element $autoBreak = !$autoBreak ? $autoBreak : $autoBreakNext; $markup .= ($autoBreak ? "\n" : '') . $this->element($Element); $autoBreak = $autoBreakNext; } $markup .= $autoBreak ? "\n" : ''; return $markup; } # ~ protected function li($lines) { $Elements = $this->linesElements($lines); if ( ! in_array('', $lines) and isset($Elements[0]) and isset($Elements[0]['name']) and $Elements[0]['name'] === 'p' ) { unset($Elements[0]['name']); } return $Elements; } # # AST Convenience # /** * Replace occurrences $regexp with $Elements in $text. Return an array of * elements representing the replacement. */ protected static function pregReplaceElements($regexp, $Elements, $text) { $newElements = array(); while (preg_match($regexp, $text, $matches, PREG_OFFSET_CAPTURE)) { $offset = $matches[0][1]; $before = substr($text, 0, $offset); $after = substr($text, $offset + strlen($matches[0][0])); $newElements[] = array('text' => $before); foreach ($Elements as $Element) { $newElements[] = $Element; } $text = $after; } $newElements[] = array('text' => $text); return $newElements; } # # Deprecated Methods # function parse($text) { $markup = $this->text($text); return $markup; } protected function sanitiseElement(array $Element) { static $goodAttribute = '/^[a-zA-Z0-9][a-zA-Z0-9-_]*+$/'; static $safeUrlNameToAtt = array( 'a' => 'href', 'img' => 'src', ); if ( ! isset($Element['name'])) { unset($Element['attributes']); return $Element; } if (isset($safeUrlNameToAtt[$Element['name']])) { $Element = $this->filterUnsafeUrlInAttribute($Element, $safeUrlNameToAtt[$Element['name']]); } if ( ! empty($Element['attributes'])) { foreach ($Element['attributes'] as $att => $val) { # filter out badly parsed attribute if ( ! preg_match($goodAttribute, $att)) { unset($Element['attributes'][$att]); } # dump onevent attribute elseif (self::striAtStart($att, 'on')) { unset($Element['attributes'][$att]); } } } return $Element; } protected function filterUnsafeUrlInAttribute(array $Element, $attribute) { foreach ($this->safeLinksWhitelist as $scheme) { if (self::striAtStart($Element['attributes'][$attribute], $scheme)) { return $Element; } } $Element['attributes'][$attribute] = str_replace(':', '%3A', $Element['attributes'][$attribute]); return $Element; } # # Static Methods # protected static function escape($text, $allowQuotes = false) { return htmlspecialchars($text, $allowQuotes ? ENT_NOQUOTES : ENT_QUOTES, 'UTF-8'); } protected static function striAtStart($string, $needle) { $len = strlen($needle); if ($len > strlen($string)) { return false; } else { return strtolower(substr($string, 0, $len)) === strtolower($needle); } } static function instance($name = 'default') { if (isset(self::$instances[$name])) { return self::$instances[$name]; } $instance = new static(); self::$instances[$name] = $instance; return $instance; } private static $instances = array(); # # Fields # protected $DefinitionData; # # Read-Only protected $specialCharacters = array( '\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!', '|', '~' ); protected $StrongRegex = array( '*' => '/^[*]{2}((?:\\\\\*|[^*]|[*][^*]*+[*])+?)[*]{2}(?![*])/s', '_' => '/^__((?:\\\\_|[^_]|_[^_]*+_)+?)__(?!_)/us', ); protected $EmRegex = array( '*' => '/^[*]((?:\\\\\*|[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s', '_' => '/^_((?:\\\\_|[^_]|__[^_]*__)+?)_(?!_)\b/us', ); protected $regexHtmlAttribute = '[a-zA-Z_:][\w:.-]*+(?:\s*+=\s*+(?:[^"\'=<>`\s]+|"[^"]*+"|\'[^\']*+\'))?+'; protected $voidElements = array( 'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', ); protected $textLevelElements = array( 'a', 'br', 'bdo', 'abbr', 'blink', 'nextid', 'acronym', 'basefont', 'b', 'em', 'big', 'cite', 'small', 'spacer', 'listing', 'i', 'rp', 'del', 'code', 'strike', 'marquee', 'q', 'rt', 'ins', 'font', 'strong', 's', 'tt', 'kbd', 'mark', 'u', 'xm', 'sub', 'nobr', 'sup', 'ruby', 'var', 'span', 'wbr', 'time', ); }