mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
822 lines
22 KiB
PHP
822 lines
22 KiB
PHP
<?php
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namespace Erusev\Parsedown;
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use Erusev\Parsedown\Parsing\Context;
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use Erusev\Parsedown\Parsing\Line;
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use Erusev\Parsedown\Parsing\Lines;
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#
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#
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# Parsedown
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# http://parsedown.org
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#
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# (c) Emanuil Rusev
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# http://erusev.com
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#
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# For the full license information, view the LICENSE file that was distributed
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# with this source code.
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#
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#
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class Parsedown
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{
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# ~
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const version = '2.0.0-dev';
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# ~
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public function text($text)
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{
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$Elements = $this->textElements($text);
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# convert to markup
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$markup = $this->elements($Elements);
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# trim line breaks
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$markup = \trim($markup, "\n");
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return $markup;
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}
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protected function textElements($text)
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{
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# iterate through lines to identify blocks
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return $this->linesElements(Lines::fromTextLines($text, 0));
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}
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#
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# Setters
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#
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public function setBreaksEnabled($breaksEnabled)
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{
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$this->breaksEnabled = $breaksEnabled;
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return $this;
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}
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protected $breaksEnabled;
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public function setMarkupEscaped($markupEscaped)
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{
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$this->markupEscaped = $markupEscaped;
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return $this;
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}
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protected $markupEscaped;
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public function setUrlsLinked($urlsLinked)
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{
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$this->urlsLinked = $urlsLinked;
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return $this;
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}
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protected $urlsLinked = true;
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public function setSafeMode($safeMode)
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{
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$this->safeMode = (bool) $safeMode;
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return $this;
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}
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protected $safeMode;
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public function setStrictMode($strictMode)
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{
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$this->strictMode = (bool) $strictMode;
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return $this;
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}
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protected $strictMode;
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protected $safeLinksWhitelist = [
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'http://',
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'https://',
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'ftp://',
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'ftps://',
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'mailto:',
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'tel:',
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'data:image/png;base64,',
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'data:image/gif;base64,',
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'data:image/jpeg;base64,',
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'irc:',
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'ircs:',
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'git:',
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'ssh:',
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'news:',
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'steam:',
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];
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#
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# Lines
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#
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protected $BlockTypes = [
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'#' => ['Header'],
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'*' => ['Rule', 'List'],
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'+' => ['List'],
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'-' => ['SetextHeader', 'Table', 'Rule', 'List'],
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'0' => ['List'],
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'1' => ['List'],
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'2' => ['List'],
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'3' => ['List'],
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'4' => ['List'],
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'5' => ['List'],
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'6' => ['List'],
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'7' => ['List'],
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'8' => ['List'],
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'9' => ['List'],
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':' => ['Table'],
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'<' => ['Comment', 'Markup'],
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'=' => ['SetextHeader'],
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'>' => ['Quote'],
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'[' => ['Reference'],
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'_' => ['Rule'],
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'`' => ['FencedCode'],
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'|' => ['Table'],
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'~' => ['FencedCode'],
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];
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# ~
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protected $unmarkedBlockTypes = [
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'Code',
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];
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#
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# Blocks
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#
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protected function lines(Lines $Lines)
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{
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return $this->elements($this->linesElements($Lines));
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}
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/** @param int $indentOffset */
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protected function linesElements(Lines $Lines, array $nonNestables = [], $indentOffset = 0)
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{
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$Elements = [];
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$CurrentBlock = null;
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foreach ($Lines->contexts() as $Context) {
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if (isset($CurrentBlock) && $Context->previousEmptyLines() > 0) {
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$CurrentBlock['interrupted'] = $Context->previousEmptyLines();
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}
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$Line = $Context->line();
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if (isset($CurrentBlock['continuable'])) {
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$methodName = 'block' . $CurrentBlock['type'] . 'Continue';
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$Block = $this->$methodName($Context, $CurrentBlock);
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if (isset($Block)) {
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$CurrentBlock = $Block;
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continue;
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} else {
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if ($this->isBlockCompletable($CurrentBlock['type'])) {
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$methodName = 'block' . $CurrentBlock['type'] . 'Complete';
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$CurrentBlock = $this->$methodName($CurrentBlock);
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}
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}
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}
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# ~
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$marker = $Line->text()[0];
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# ~
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$blockTypes = $this->unmarkedBlockTypes;
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if (isset($this->BlockTypes[$marker])) {
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foreach ($this->BlockTypes[$marker] as $blockType) {
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$blockTypes []= $blockType;
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}
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}
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#
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# ~
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foreach ($blockTypes as $blockType) {
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$Block = $this->{"block$blockType"}($Context, $CurrentBlock);
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if (isset($Block)) {
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$Block['type'] = $blockType;
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if (! isset($Block['identified'])) {
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if (isset($CurrentBlock)) {
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$Elements[] = $this->extractElement($CurrentBlock);
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}
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$Block['identified'] = true;
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}
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if ($this->isBlockContinuable($blockType)) {
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$Block['continuable'] = true;
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}
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$CurrentBlock = $Block;
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continue 2;
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}
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}
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# ~
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if (isset($CurrentBlock) and $CurrentBlock['type'] === 'Paragraph') {
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$Block = $this->paragraphContinue($Context, $CurrentBlock);
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}
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if (isset($Block)) {
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$CurrentBlock = $Block;
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} else {
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if (isset($CurrentBlock)) {
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$Elements[] = $this->extractElement($CurrentBlock);
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}
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$CurrentBlock = $this->paragraph($Context);
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$CurrentBlock['identified'] = true;
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}
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}
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# ~
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if (isset($CurrentBlock['continuable']) and $this->isBlockCompletable($CurrentBlock['type'])) {
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$methodName = 'block' . $CurrentBlock['type'] . 'Complete';
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$CurrentBlock = $this->$methodName($CurrentBlock);
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}
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# ~
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if (isset($CurrentBlock)) {
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$Elements[] = $this->extractElement($CurrentBlock);
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}
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# ~
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return $Elements;
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}
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protected function extractElement(array $Component)
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{
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if (! isset($Component['element'])) {
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if (isset($Component['markup'])) {
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$Component['element'] = ['rawHtml' => $Component['markup']];
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} elseif (isset($Component['hidden'])) {
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$Component['element'] = [];
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}
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}
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return $Component['element'];
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}
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protected function isBlockContinuable($Type)
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{
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return \method_exists($this, 'block' . $Type . 'Continue');
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}
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protected function isBlockCompletable($Type)
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{
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return \method_exists($this, 'block' . $Type . 'Complete');
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}
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#
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# Inline Elements
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#
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protected $InlineTypes = [
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'!' => ['Image'],
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'&' => ['SpecialCharacter'],
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'*' => ['Emphasis'],
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':' => ['Url'],
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'<' => ['UrlTag', 'EmailTag', 'Markup'],
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'[' => ['Link'],
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'_' => ['Emphasis'],
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'`' => ['Code'],
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'~' => ['Strikethrough'],
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'\\' => ['EscapeSequence'],
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];
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# ~
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protected $inlineMarkerList = '!*_&[:<`~\\';
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#
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# ~
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#
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public function line($text, $nonNestables = [])
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{
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return $this->elements($this->lineElements($text, $nonNestables));
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}
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protected function lineElements($text, $nonNestables = [])
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{
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# standardize line breaks
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$text = \str_replace(["\r\n", "\r"], "\n", $text);
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$Elements = [];
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$nonNestables = (
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empty($nonNestables)
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? []
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: \array_combine($nonNestables, $nonNestables)
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);
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# $excerpt is based on the first occurrence of a marker
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while ($excerpt = \strpbrk($text, $this->inlineMarkerList)) {
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$marker = $excerpt[0];
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$markerPosition = \strlen($text) - \strlen($excerpt);
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$Excerpt = ['text' => $excerpt, 'context' => $text];
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foreach ($this->InlineTypes[$marker] as $inlineType) {
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# check to see if the current inline type is nestable in the current context
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if (isset($nonNestables[$inlineType])) {
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continue;
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}
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$Inline = $this->{"inline$inlineType"}($Excerpt);
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if (! isset($Inline)) {
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continue;
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}
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# makes sure that the inline belongs to "our" marker
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if (isset($Inline['position']) and $Inline['position'] > $markerPosition) {
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continue;
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}
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# sets a default inline position
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if (! isset($Inline['position'])) {
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$Inline['position'] = $markerPosition;
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}
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# cause the new element to 'inherit' our non nestables
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$Inline['element']['nonNestables'] = isset($Inline['element']['nonNestables'])
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? \array_merge($Inline['element']['nonNestables'], $nonNestables)
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: $nonNestables
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;
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# the text that comes before the inline
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$unmarkedText = \substr($text, 0, $Inline['position']);
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# compile the unmarked text
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$InlineText = $this->inlineText($unmarkedText);
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$Elements[] = $InlineText['element'];
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# compile the inline
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$Elements[] = $this->extractElement($Inline);
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# remove the examined text
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$text = \substr($text, $Inline['position'] + $Inline['extent']);
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continue 2;
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}
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# the marker does not belong to an inline
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$unmarkedText = \substr($text, 0, $markerPosition + 1);
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$InlineText = $this->inlineText($unmarkedText);
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$Elements[] = $InlineText['element'];
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$text = \substr($text, $markerPosition + 1);
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}
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$InlineText = $this->inlineText($text);
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$Elements[] = $InlineText['element'];
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foreach ($Elements as &$Element) {
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if (! isset($Element['autobreak'])) {
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$Element['autobreak'] = false;
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}
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}
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return $Elements;
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}
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protected function inlineUrl($Excerpt)
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{
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if ($this->urlsLinked !== true or ! isset($Excerpt['text'][2]) or $Excerpt['text'][2] !== '/') {
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return;
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}
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if (\strpos($Excerpt['context'], 'http') !== false
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and \preg_match('/\bhttps?+:[\/]{2}[^\s<]+\b\/*+/ui', $Excerpt['context'], $matches, \PREG_OFFSET_CAPTURE)
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) {
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$url = $matches[0][0];
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$Inline = [
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'extent' => \strlen($matches[0][0]),
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'position' => $matches[0][1],
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'element' => [
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'name' => 'a',
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'text' => $url,
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'attributes' => [
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'href' => $url,
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],
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],
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];
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return $Inline;
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}
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}
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protected function inlineUrlTag($Excerpt)
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{
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if (\strpos($Excerpt['text'], '>') !== false and \preg_match('/^<(\w++:\/{2}[^ >]++)>/i', $Excerpt['text'], $matches)) {
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$url = $matches[1];
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return [
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'extent' => \strlen($matches[0]),
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'element' => [
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'name' => 'a',
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'text' => $url,
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'attributes' => [
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'href' => $url,
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],
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],
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];
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}
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}
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# ~
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protected function unmarkedText($text)
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{
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$Inline = $this->inlineText($text);
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return $this->element($Inline['element']);
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}
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#
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# Handlers
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#
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protected function handle(array $Element)
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{
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if (isset($Element['handler'])) {
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if (!isset($Element['nonNestables'])) {
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$Element['nonNestables'] = [];
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}
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if (\is_string($Element['handler'])) {
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$function = $Element['handler'];
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$argument = $Element['text'];
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unset($Element['text']);
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$destination = 'rawHtml';
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} else {
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$function = $Element['handler']['function'];
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$argument = $Element['handler']['argument'];
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$destination = $Element['handler']['destination'];
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}
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$Element[$destination] = $this->{$function}($argument, $Element['nonNestables']);
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if ($destination === 'handler') {
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$Element = $this->handle($Element);
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}
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unset($Element['handler']);
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}
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return $Element;
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}
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protected function handleElementRecursive(array $Element)
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{
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return $this->elementApplyRecursive([$this, 'handle'], $Element);
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}
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protected function handleElementsRecursive(array $Elements)
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{
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return $this->elementsApplyRecursive([$this, 'handle'], $Elements);
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}
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protected function elementApplyRecursive($closure, array $Element)
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{
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$Element = \call_user_func($closure, $Element);
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if (isset($Element['elements'])) {
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$Element['elements'] = $this->elementsApplyRecursive($closure, $Element['elements']);
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} elseif (isset($Element['element'])) {
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$Element['element'] = $this->elementApplyRecursive($closure, $Element['element']);
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}
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return $Element;
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}
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protected function elementApplyRecursiveDepthFirst($closure, array $Element)
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{
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if (isset($Element['elements'])) {
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$Element['elements'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['elements']);
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} elseif (isset($Element['element'])) {
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$Element['element'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['element']);
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}
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$Element = \call_user_func($closure, $Element);
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return $Element;
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}
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protected function elementsApplyRecursive($closure, array $Elements)
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{
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foreach ($Elements as &$Element) {
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$Element = $this->elementApplyRecursive($closure, $Element);
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}
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return $Elements;
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}
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protected function elementsApplyRecursiveDepthFirst($closure, array $Elements)
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{
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foreach ($Elements as &$Element) {
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$Element = $this->elementApplyRecursiveDepthFirst($closure, $Element);
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}
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return $Elements;
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}
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protected function element(array $Element)
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{
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if ($this->safeMode) {
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$Element = $this->sanitiseElement($Element);
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}
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# identity map if element has no handler
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$Element = $this->handle($Element);
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$hasName = isset($Element['name']);
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$markup = '';
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if ($hasName) {
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$markup .= '<' . $Element['name'];
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if (isset($Element['attributes'])) {
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foreach ($Element['attributes'] as $name => $value) {
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if ($value === null) {
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continue;
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}
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$markup .= " $name=\"".self::escape($value).'"';
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}
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}
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}
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$permitRawHtml = false;
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if (isset($Element['text'])) {
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$text = $Element['text'];
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}
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// very strongly consider an alternative if you're writing an
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// extension
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elseif (isset($Element['rawHtml'])) {
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$text = $Element['rawHtml'];
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$allowRawHtmlInSafeMode = isset($Element['allowRawHtmlInSafeMode']) && $Element['allowRawHtmlInSafeMode'];
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$permitRawHtml = !$this->safeMode || $allowRawHtmlInSafeMode;
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}
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$hasContent = isset($text) || isset($Element['element']) || isset($Element['elements']);
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if ($hasContent) {
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$markup .= $hasName ? '>' : '';
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if (isset($Element['elements'])) {
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$markup .= $this->elements($Element['elements']);
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} elseif (isset($Element['element'])) {
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$markup .= $this->element($Element['element']);
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} else {
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if (!$permitRawHtml) {
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$markup .= self::escape($text, true);
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} else {
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$markup .= $text;
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}
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}
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$markup .= $hasName ? '</' . $Element['name'] . '>' : '';
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|
} elseif ($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 $Lines)
|
|
{
|
|
$Elements = $this->linesElements($Lines);
|
|
|
|
if (! $Lines->containsBlankLines()
|
|
and isset($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)
|
|
{
|
|
$newElements = [];
|
|
|
|
while (\preg_match($regexp, $text, $matches, \PREG_OFFSET_CAPTURE)) {
|
|
$offset = $matches[0][1];
|
|
$before = \substr($text, 0, $offset);
|
|
$after = \substr($text, $offset + \strlen($matches[0][0]));
|
|
|
|
$newElements[] = ['text' => $before];
|
|
|
|
foreach ($Elements as $Element) {
|
|
$newElements[] = $Element;
|
|
}
|
|
|
|
$text = $after;
|
|
}
|
|
|
|
$newElements[] = ['text' => $text];
|
|
|
|
return $newElements;
|
|
}
|
|
|
|
#
|
|
# Deprecated Methods
|
|
#
|
|
|
|
public function parse($text)
|
|
{
|
|
$markup = $this->text($text);
|
|
|
|
return $markup;
|
|
}
|
|
|
|
protected function sanitiseElement(array $Element)
|
|
{
|
|
static $goodAttribute = '/^[a-zA-Z0-9][a-zA-Z0-9-_]*+$/';
|
|
static $safeUrlNameToAtt = [
|
|
'a' => 'href',
|
|
'img' => 'src',
|
|
];
|
|
|
|
if (! isset($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);
|
|
}
|
|
}
|
|
|
|
public 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 = [];
|
|
|
|
#
|
|
# Read-Only
|
|
|
|
protected $specialCharacters = [
|
|
'\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!', '|', '~'
|
|
];
|
|
|
|
protected $StrongRegex = [
|
|
'*' => '/^[*]{2}((?:\\\\\*|[^*]|[*][^*]*+[*])+?)[*]{2}(?![*])/s',
|
|
'_' => '/^__((?:\\\\_|[^_]|_[^_]*+_)+?)__(?!_)/us',
|
|
];
|
|
|
|
protected $EmRegex = [
|
|
'*' => '/^[*]((?:\\\\\*|[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
|
|
'_' => '/^_((?:\\\\_|[^_]|__[^_]*__)+?)_(?!_)\b/us',
|
|
];
|
|
|
|
protected $regexHtmlAttribute = '[a-zA-Z_:][\w:.-]*+(?:\s*+=\s*+(?:[^"\'=<>`\s]+|"[^"]*+"|\'[^\']*+\'))?+';
|
|
|
|
protected $voidElements = [
|
|
'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source',
|
|
];
|
|
|
|
protected $textLevelElements = [
|
|
'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',
|
|
];
|
|
}
|