Update Emogrifier
This commit is contained in:
Mike Jolley
parent
cea9b59523
commit
2edf517b2e
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<?php
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namespace Pelago\Emogrifier;
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/**
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* Facilitates building a CSS string by appending rule blocks one at a time, checking whether the media query,
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* selectors, or declarations block are the same as those from the preceding block and combining blocks in such cases.
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*
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* Example:
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* $concatenator = new CssConcatenator();
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* $concatenator->append(['body'], 'color: blue;');
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* $concatenator->append(['body'], 'font-size: 16px;');
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* $concatenator->append(['p'], 'margin: 1em 0;');
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* $concatenator->append(['ul', 'ol'], 'margin: 1em 0;');
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* $concatenator->append(['body'], 'font-size: 14px;', '@media screen and (max-width: 400px)');
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* $concatenator->append(['ul', 'ol'], 'margin: 0.75em 0;', '@media screen and (max-width: 400px)');
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* $css = $concatenator->getCss();
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*
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* `$css` (if unminified) would contain the following CSS:
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* ` body {
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* ` color: blue;
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* ` font-size: 16px;
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* ` }
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* ` p, ul, ol {
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* ` margin: 1em 0;
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* ` }
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* ` @media screen and (max-width: 400px) {
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* ` body {
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* ` font-size: 14px;
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* ` }
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* ` ul, ol {
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* ` margin: 0.75em 0;
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* ` }
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* ` }
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*
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* @author Jake Hotson <jake.github@qzdesign.co.uk>
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*/
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class CssConcatenator
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{
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/**
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* Array of media rules in order. Each element is an object with the following properties:
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* - string `media` - The media query string, e.g. "@media screen and (max-width:639px)", or an empty string for
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* rules not within a media query block;
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* - \stdClass[] `ruleBlocks` - Array of rule blocks in order, where each element is an object with the following
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* properties:
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* - mixed[] `selectorsAsKeys` - Array whose keys are selectors for the rule block (values are of no
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* significance);
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* - string `declarationsBlock` - The property declarations, e.g. "margin-top: 0.5em; padding: 0".
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*
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* @var \stdClass[]
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*/
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private $mediaRules = [];
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/**
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* Appends a declaration block to the CSS.
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*
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* @param string[] $selectors Array of selectors for the rule, e.g. ["ul", "ol", "p:first-child"].
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* @param string $declarationsBlock The property declarations, e.g. "margin-top: 0.5em; padding: 0".
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* @param string $media The media query for the rule, e.g. "@media screen and (max-width:639px)",
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* or an empty string if none.
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*/
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public function append(array $selectors, $declarationsBlock, $media = '')
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{
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$selectorsAsKeys = \array_flip($selectors);
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$mediaRule = $this->getOrCreateMediaRuleToAppendTo($media);
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$lastRuleBlock = \end($mediaRule->ruleBlocks);
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$hasSameDeclarationsAsLastRule = $lastRuleBlock !== false
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&& $declarationsBlock === $lastRuleBlock->declarationsBlock;
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if ($hasSameDeclarationsAsLastRule) {
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$lastRuleBlock->selectorsAsKeys += $selectorsAsKeys;
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} else {
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$hasSameSelectorsAsLastRule = $lastRuleBlock !== false
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&& static::hasEquivalentSelectors($selectorsAsKeys, $lastRuleBlock->selectorsAsKeys);
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if ($hasSameSelectorsAsLastRule) {
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$lastDeclarationsBlockWithoutSemicolon = \rtrim(\rtrim($lastRuleBlock->declarationsBlock), ';');
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$lastRuleBlock->declarationsBlock = $lastDeclarationsBlockWithoutSemicolon . ';' . $declarationsBlock;
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} else {
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$mediaRule->ruleBlocks[] = (object)\compact('selectorsAsKeys', 'declarationsBlock');
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}
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}
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}
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/**
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* @return string
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*/
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public function getCss()
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{
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return \implode('', \array_map([$this, 'getMediaRuleCss'], $this->mediaRules));
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}
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/**
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* @param string $media The media query for rules to be appended, e.g. "@media screen and (max-width:639px)",
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* or an empty string if none.
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*
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* @return \stdClass Object with properties as described for elements of `$mediaRules`.
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*/
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private function getOrCreateMediaRuleToAppendTo($media)
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{
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$lastMediaRule = \end($this->mediaRules);
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if ($lastMediaRule !== false && $media === $lastMediaRule->media) {
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return $lastMediaRule;
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}
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$newMediaRule = (object)[
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'media' => $media,
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'ruleBlocks' => [],
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];
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$this->mediaRules[] = $newMediaRule;
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return $newMediaRule;
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}
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/**
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* Tests if two sets of selectors are equivalent (i.e. the same selectors, possibly in a different order).
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*
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* @param mixed[] $selectorsAsKeys1 Array in which the selectors are the keys, and the values are of no
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* significance.
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* @param mixed[] $selectorsAsKeys2 Another such array.
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*
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* @return bool
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*/
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private static function hasEquivalentSelectors(array $selectorsAsKeys1, array $selectorsAsKeys2)
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{
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return \count($selectorsAsKeys1) === \count($selectorsAsKeys2)
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&& \count($selectorsAsKeys1) === \count($selectorsAsKeys1 + $selectorsAsKeys2);
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}
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/**
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* @param \stdClass $mediaRule Object with properties as described for elements of `$mediaRules`.
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*
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* @return string CSS for the media rule.
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*/
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private static function getMediaRuleCss(\stdClass $mediaRule)
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{
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$css = \implode('', \array_map([static::class, 'getRuleBlockCss'], $mediaRule->ruleBlocks));
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if ($mediaRule->media !== '') {
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$css = $mediaRule->media . '{' . $css . '}';
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}
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return $css;
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}
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/**
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* @param \stdClass $ruleBlock Object with properties as described for elements of the `ruleBlocks` property of
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* elements of `$mediaRules`.
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*
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* @return string CSS for the rule block.
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*/
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private static function getRuleBlockCss(\stdClass $ruleBlock)
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{
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$selectors = \array_keys($ruleBlock->selectorsAsKeys);
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return \implode(',', $selectors) . '{' . $ruleBlock->declarationsBlock . '}';
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}
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}
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,221 @@
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<?php
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namespace Pelago\Emogrifier\HtmlProcessor;
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/**
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* Base class for HTML processor that e.g., can remove, add or modify nodes or attributes.
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*
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* The "vanilla" subclass is the HtmlNormalizer.
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*
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* @internal This class currently is a new technology preview, and its API is still in flux. Don't use it in production.
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*
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* @author Oliver Klee <github@oliverklee.de>
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*/
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abstract class AbstractHtmlProcessor
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{
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/**
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* @var string
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*/
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const DEFAULT_DOCUMENT_TYPE = '<!DOCTYPE html>';
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/**
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* @var string
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*/
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const CONTENT_TYPE_META_TAG = '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">';
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/**
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* @var \DOMDocument
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*/
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protected $domDocument = null;
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/**
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* @param string $unprocessedHtml raw HTML, must be UTF-encoded, must not be empty
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*
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* @throws \InvalidArgumentException if $unprocessedHtml is anything other than a non-empty string
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*/
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public function __construct($unprocessedHtml)
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{
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if (!\is_string($unprocessedHtml)) {
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throw new \InvalidArgumentException('The provided HTML must be a string.', 1515459744);
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}
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if ($unprocessedHtml === '') {
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throw new \InvalidArgumentException('The provided HTML must not be empty.', 1515763647);
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}
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$this->setHtml($unprocessedHtml);
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}
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/**
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* Sets the HTML to process.
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*
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* @param string $html the HTML to process, must be UTF-8-encoded
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*
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* @return void
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*/
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private function setHtml($html)
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{
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$this->createUnifiedDomDocument($html);
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}
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/**
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* Provides access to the internal DOMDocument representation of the HTML in its current state.
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*
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* @return \DOMDocument
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*/
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public function getDomDocument()
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{
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return $this->domDocument;
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}
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/**
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* Renders the normalized and processed HTML.
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*
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* @return string
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*/
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public function render()
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{
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return $this->domDocument->saveHTML();
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}
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/**
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* Renders the content of the BODY element of the normalized and processed HTML.
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*
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* @return string
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*/
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public function renderBodyContent()
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{
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$bodyNodeHtml = $this->domDocument->saveHTML($this->getBodyElement());
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return \str_replace(['<body>', '</body>'], '', $bodyNodeHtml);
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}
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/**
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* Returns the BODY element.
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*
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* This method assumes that there always is a BODY element.
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*
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* @return \DOMElement
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*/
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private function getBodyElement()
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{
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return $this->domDocument->getElementsByTagName('body')->item(0);
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}
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/**
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* Creates a DOM document from the given HTML and stores it in $this->domDocument.
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*
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* The DOM document will always have a BODY element and a document type.
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*
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* @param string $html
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*
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* @return void
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*/
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private function createUnifiedDomDocument($html)
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{
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$this->createRawDomDocument($html);
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$this->ensureExistenceOfBodyElement();
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}
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/**
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* Creates a DOMDocument instance from the given HTML and stores it in $this->domDocument.
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*
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* @param string $html
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*
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* @return void
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*/
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private function createRawDomDocument($html)
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{
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$domDocument = new \DOMDocument();
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$domDocument->strictErrorChecking = false;
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$domDocument->formatOutput = true;
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$libXmlState = \libxml_use_internal_errors(true);
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$domDocument->loadHTML($this->prepareHtmlForDomConversion($html));
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\libxml_clear_errors();
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\libxml_use_internal_errors($libXmlState);
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$this->domDocument = $domDocument;
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}
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/**
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* Returns the HTML with added document type and Content-Type meta tag if needed,
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* ensuring that the HTML will be good for creating a DOM document from it.
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*
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* @param string $html
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*
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* @return string the unified HTML
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*/
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private function prepareHtmlForDomConversion($html)
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{
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$htmlWithDocumentType = $this->ensureDocumentType($html);
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return $this->addContentTypeMetaTag($htmlWithDocumentType);
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}
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/**
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* Makes sure that the passed HTML has a document type.
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*
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* @param string $html
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*
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* @return string HTML with document type
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*/
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private function ensureDocumentType($html)
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{
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$hasDocumentType = \stripos($html, '<!DOCTYPE') !== false;
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if ($hasDocumentType) {
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return $html;
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}
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return static::DEFAULT_DOCUMENT_TYPE . $html;
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}
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/**
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* Adds a Content-Type meta tag for the charset.
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*
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* This method also ensures that there is a HEAD element.
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* @param string $html
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*
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* @return string the HTML with the meta tag added
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*/
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private function addContentTypeMetaTag($html)
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{
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$hasContentTypeMetaTag = \stripos($html, 'Content-Type') !== false;
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if ($hasContentTypeMetaTag) {
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return $html;
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}
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// We are trying to insert the meta tag to the right spot in the DOM.
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// If we just prepended it to the HTML, we would lose attributes set to the HTML tag.
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$hasHeadTag = \stripos($html, '<head') !== false;
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$hasHtmlTag = \stripos($html, '<html') !== false;
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if ($hasHeadTag) {
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$reworkedHtml = \preg_replace('/<head(.*?)>/i', '<head$1>' . static::CONTENT_TYPE_META_TAG, $html);
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} elseif ($hasHtmlTag) {
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$reworkedHtml = \preg_replace(
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'/<html(.*?)>/i',
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'<html$1><head>' . static::CONTENT_TYPE_META_TAG . '</head>',
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$html
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);
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} else {
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$reworkedHtml = static::CONTENT_TYPE_META_TAG . $html;
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}
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return $reworkedHtml;
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}
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/**
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* Checks that $this->domDocument has a BODY element and adds it if it is missing.
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*
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* @return void
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*/
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private function ensureExistenceOfBodyElement()
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{
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if ($this->domDocument->getElementsByTagName('body')->item(0) !== null) {
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return;
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}
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$htmlElement = $this->domDocument->getElementsByTagName('html')->item(0);
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$htmlElement->appendChild($this->domDocument->createElement('body'));
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}
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}
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@ -0,0 +1,320 @@
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<?php
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namespace Pelago\Emogrifier\HtmlProcessor;
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/**
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* This HtmlProcessor can convert style HTML attributes to the corresponding other visual HTML attributes,
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* e.g. it converts style="width: 100px" to width="100".
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*
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* It will only add attributes, but leaves the style attribute untouched.
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*
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* To trigger the conversion, call the convertCssToVisualAttributes method.
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*
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* @internal This class currently is a new technology preview, and its API is still in flux. Don't use it in production.
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*
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* @author Oliver Klee <github@oliverklee.de>
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*/
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class CssToAttributeConverter extends AbstractHtmlProcessor
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{
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/**
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* This multi-level array contains simple mappings of CSS properties to
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* HTML attributes. If a mapping only applies to certain HTML nodes or
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* only for certain values, the mapping is an object with a whitelist
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* of nodes and values.
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*
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* @var mixed[][]
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*/
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private $cssToHtmlMap = [
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'background-color' => [
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'attribute' => 'bgcolor',
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],
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'text-align' => [
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'attribute' => 'align',
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'nodes' => ['p', 'div', 'td'],
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'values' => ['left', 'right', 'center', 'justify'],
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],
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'float' => [
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'attribute' => 'align',
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'nodes' => ['table', 'img'],
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'values' => ['left', 'right'],
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],
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'border-spacing' => [
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'attribute' => 'cellspacing',
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'nodes' => ['table'],
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],
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];
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/**
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* @var string[][]
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*/
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private static $parsedCssCache = [];
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/**
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* Maps the CSS from the style nodes to visual HTML attributes.
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*
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* @return CssToAttributeConverter fluent interface
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*/
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public function convertCssToVisualAttributes()
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{
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/** @var \DOMElement $node */
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foreach ($this->getAllNodesWithStyleAttribute() as $node) {
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$inlineStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
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$this->mapCssToHtmlAttributes($inlineStyleDeclarations, $node);
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}
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return $this;
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}
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/**
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* Returns a list with all DOM nodes that have a style attribute.
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*
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* @return \DOMNodeList
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*/
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private function getAllNodesWithStyleAttribute()
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{
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$xPath = new \DOMXPath($this->domDocument);
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return $xPath->query('//*[@style]');
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}
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/**
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* Parses a CSS declaration block into property name/value pairs.
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*
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* Example:
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*
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* The declaration block
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*
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* "color: #000; font-weight: bold;"
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*
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* will be parsed into the following array:
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*
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* "color" => "#000"
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* "font-weight" => "bold"
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*
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* @param string $cssDeclarationsBlock the CSS declarations block without the curly braces, may be empty
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*
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* @return string[]
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* the CSS declarations with the property names as array keys and the property values as array values
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*/
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private function parseCssDeclarationsBlock($cssDeclarationsBlock)
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{
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if (isset(self::$parsedCssCache[$cssDeclarationsBlock])) {
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return self::$parsedCssCache[$cssDeclarationsBlock];
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}
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$properties = [];
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$declarations = \preg_split('/;(?!base64|charset)/', $cssDeclarationsBlock);
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foreach ($declarations as $declaration) {
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$matches = [];
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if (!\preg_match('/^([A-Za-z\\-]+)\\s*:\\s*(.+)$/s', \trim($declaration), $matches)) {
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continue;
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}
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$propertyName = \strtolower($matches[1]);
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$propertyValue = $matches[2];
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$properties[$propertyName] = $propertyValue;
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}
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self::$parsedCssCache[$cssDeclarationsBlock] = $properties;
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return $properties;
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}
|
||||
|
||||
/**
|
||||
* Applies $styles to $node.
|
||||
*
|
||||
* This method maps CSS styles to HTML attributes and adds those to the
|
||||
* node.
|
||||
*
|
||||
* @param string[] $styles the new CSS styles taken from the global styles to be applied to this node
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapCssToHtmlAttributes(array $styles, \DOMElement $node)
|
||||
{
|
||||
foreach ($styles as $property => $value) {
|
||||
// Strip !important indicator
|
||||
$value = \trim(\str_replace('!important', '', $value));
|
||||
$this->mapCssToHtmlAttribute($property, $value, $node);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Tries to apply the CSS style to $node as an attribute.
|
||||
*
|
||||
* This method maps a CSS rule to HTML attributes and adds those to the node.
|
||||
*
|
||||
* @param string $property the name of the CSS property to map
|
||||
* @param string $value the value of the style rule to map
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapCssToHtmlAttribute($property, $value, \DOMElement $node)
|
||||
{
|
||||
if (!$this->mapSimpleCssProperty($property, $value, $node)) {
|
||||
$this->mapComplexCssProperty($property, $value, $node);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Looks up the CSS property in the mapping table and maps it if it matches the conditions.
|
||||
*
|
||||
* @param string $property the name of the CSS property to map
|
||||
* @param string $value the value of the style rule to map
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
*
|
||||
* @return bool true if the property can be mapped using the simple mapping table
|
||||
*/
|
||||
private function mapSimpleCssProperty($property, $value, \DOMElement $node)
|
||||
{
|
||||
if (!isset($this->cssToHtmlMap[$property])) {
|
||||
return false;
|
||||
}
|
||||
|
||||
$mapping = $this->cssToHtmlMap[$property];
|
||||
$nodesMatch = !isset($mapping['nodes']) || \in_array($node->nodeName, $mapping['nodes'], true);
|
||||
$valuesMatch = !isset($mapping['values']) || \in_array($value, $mapping['values'], true);
|
||||
if (!$nodesMatch || !$valuesMatch) {
|
||||
return false;
|
||||
}
|
||||
|
||||
$node->setAttribute($mapping['attribute'], $value);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Maps CSS properties that need special transformation to an HTML attribute.
|
||||
*
|
||||
* @param string $property the name of the CSS property to map
|
||||
* @param string $value the value of the style rule to map
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapComplexCssProperty($property, $value, \DOMElement $node)
|
||||
{
|
||||
switch ($property) {
|
||||
case 'background':
|
||||
$this->mapBackgroundProperty($node, $value);
|
||||
break;
|
||||
case 'width':
|
||||
// intentional fall-through
|
||||
case 'height':
|
||||
$this->mapWidthOrHeightProperty($node, $value, $property);
|
||||
break;
|
||||
case 'margin':
|
||||
$this->mapMarginProperty($node, $value);
|
||||
break;
|
||||
case 'border':
|
||||
$this->mapBorderProperty($node, $value);
|
||||
break;
|
||||
default:
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
* @param string $value the value of the style rule to map
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapBackgroundProperty(\DOMElement $node, $value)
|
||||
{
|
||||
// parse out the color, if any
|
||||
$styles = \explode(' ', $value);
|
||||
$first = $styles[0];
|
||||
if (!\is_numeric($first[0]) && \strpos($first, 'url') !== 0) {
|
||||
// as this is not a position or image, assume it's a color
|
||||
$node->setAttribute('bgcolor', $first);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
* @param string $value the value of the style rule to map
|
||||
* @param string $property the name of the CSS property to map
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapWidthOrHeightProperty(\DOMElement $node, $value, $property)
|
||||
{
|
||||
// only parse values in px and %, but not values like "auto"
|
||||
if (!\preg_match('/^(\\d+)(px|%)$/', $value)) {
|
||||
return;
|
||||
}
|
||||
|
||||
$number = \preg_replace('/[^0-9.%]/', '', $value);
|
||||
$node->setAttribute($property, $number);
|
||||
}
|
||||
|
||||
/**
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
* @param string $value the value of the style rule to map
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapMarginProperty(\DOMElement $node, $value)
|
||||
{
|
||||
if (!$this->isTableOrImageNode($node)) {
|
||||
return;
|
||||
}
|
||||
|
||||
$margins = $this->parseCssShorthandValue($value);
|
||||
if ($margins['left'] === 'auto' && $margins['right'] === 'auto') {
|
||||
$node->setAttribute('align', 'center');
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @param \DOMElement $node node to apply styles to
|
||||
* @param string $value the value of the style rule to map
|
||||
*
|
||||
* @return void
|
||||
*/
|
||||
private function mapBorderProperty(\DOMElement $node, $value)
|
||||
{
|
||||
if (!$this->isTableOrImageNode($node)) {
|
||||
return;
|
||||
}
|
||||
|
||||
if ($value === 'none' || $value === '0') {
|
||||
$node->setAttribute('border', '0');
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* @param \DOMElement $node
|
||||
*
|
||||
* @return bool
|
||||
*/
|
||||
private function isTableOrImageNode(\DOMElement $node)
|
||||
{
|
||||
return $node->nodeName === 'table' || $node->nodeName === 'img';
|
||||
}
|
||||
|
||||
/**
|
||||
* Parses a shorthand CSS value and splits it into individual values
|
||||
*
|
||||
* @param string $value a string of CSS value with 1, 2, 3 or 4 sizes
|
||||
* For example: padding: 0 auto;
|
||||
* '0 auto' is split into top: 0, left: auto, bottom: 0,
|
||||
* right: auto.
|
||||
*
|
||||
* @return string[] an array of values for top, right, bottom and left (using these as associative array keys)
|
||||
*/
|
||||
private function parseCssShorthandValue($value)
|
||||
{
|
||||
$values = \preg_split('/\\s+/', $value);
|
||||
|
||||
$css = [];
|
||||
$css['top'] = $values[0];
|
||||
$css['right'] = (\count($values) > 1) ? $values[1] : $css['top'];
|
||||
$css['bottom'] = (\count($values) > 2) ? $values[2] : $css['top'];
|
||||
$css['left'] = (\count($values) > 3) ? $values[3] : $css['right'];
|
||||
|
||||
return $css;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,18 @@
|
|||
<?php
|
||||
|
||||
namespace Pelago\Emogrifier\HtmlProcessor;
|
||||
|
||||
/**
|
||||
* Normalizes HTML:
|
||||
* - add a document type (HTML5) if missing
|
||||
* - disentangle incorrectly nested tags
|
||||
* - add HEAD and BODY elements (if they are missing)
|
||||
* - reformat the HTML
|
||||
*
|
||||
* @internal This class currently is a new technology preview, and its API is still in flux. Don't use it in production.
|
||||
*
|
||||
* @author Oliver Klee <github@oliverklee.de>
|
||||
*/
|
||||
class HtmlNormalizer extends AbstractHtmlProcessor
|
||||
{
|
||||
}
|
||||
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Reference in New Issue