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540 lines
28 KiB
540 lines
28 KiB
<?php
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/** @license MIT
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* Copyright 2017 , Dustin Wilson, J. King et al.
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* See LICENSE and AUTHORS files for details */
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declare(strict_types=1);
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namespace MensBeam\HTML\Parser;
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use MensBeam\HTML\Parser;
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abstract class Serializer {
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use NameCoercion;
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// Elements treated as block elements when reformatting whitespace
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protected const BLOCK_ELEMENTS = [ 'address', 'article', 'aside', 'blockquote', 'base', 'body', 'details', 'dialog', 'dd', 'div', 'dl', 'dt', 'fieldset', 'figcaption', 'figure', 'footer', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hr', 'html', 'isindex', 'li', 'link', 'main', 'meta', 'nav', 'ol', 'p', 'picture', 'pre', 'section', 'script', 'source', 'style', 'table', 'td', 'tfoot', 'th', 'thead', 'title', 'tr', 'ul' ];
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// List of h-elements which are used to determine element grouping for the
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// purposes of reformatting whitespace
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protected const H_ELEMENTS = [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ];
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// List of preformatted elements where content is ignored for the purposes of
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// reformatting whitespace
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protected const PREFORMATTED_ELEMENTS = [ 'iframe', 'listing', 'noembed', 'noframes', 'noscript', 'plaintext', 'pre', 'style', 'script', 'textarea', 'title', 'xmp' ];
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protected const VOID_ELEMENTS = ["basefont", "bgsound", "frame", "keygen", "area", "base", "br", "col", "embed", "hr", "img", "input", "link", "meta", "param", "source", "track", "wbr"];
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protected const RAWTEXT_ELEMENTS = ["style", "script", "xmp", "iframe", "noembed", "noframes", "plaintext"];
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protected const BOOLEAN_ATTRIBUTES = [
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'allowfullscreen' => ["iframe"],
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'async' => ["script"],
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'autofocus' => true,
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'autoplay' => ["audio", "video"],
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'checked' => ["input"],
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'compact' => ["dir", "dl", "menu", "ol", "ul"],
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'controls' => ["audio", "video"],
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'declare' => ["object"],
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'default' => ["track"],
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'defer' => ["script"],
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'disabled' => ["button", "fieldset", "input", "link", "optgroup", "option", "select", "textarea"],
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'formnovalidate' => ["button", "input"],
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'hidden' => true,
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'ismap' => ["img"],
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'itemscope' => true,
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'loop' => ["audio", "video"],
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'multiple' => ["input", "select"],
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'muted' => ["audio", "video"],
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'nohref' => ["area"],
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'nomodule' => ["script"],
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'noresize' => ["frame"],
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'noshade' => ["hr"],
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'novalidate' => ["form"],
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'nowrap' => ["td", "th"],
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'open' => ["details", "dialog"],
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'playsinline' => ["video"],
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'readonly' => ["input", "textarea"],
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'required' => ["input", "select", "textarea"],
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'reversed' => ["ol"],
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'selected' => ["option"],
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];
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/* Used when reformatting whitespace when nodes are checked for being treated as block. */
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protected const BLOCK_QUERY = 'count(.//*[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"][not(ancestor::iframe[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::listing[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noembed[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noframes[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::noscript[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::plaintext[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::pre[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::style[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::script[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::textarea[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::title[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"] or ancestor::xmp[namespace-uri()="" or namespace-uri()="http://www.w3.org/1999/xhtml"])][name()="address" or name()="article" or name()="aside" or name()="blockquote" or name()="base" or name()="body" or name()="details" or name()="dialog" or name()="dd" or name()="div" or name()="dl" or name()="dt" or name()="fieldset" or name()="figcaption" or name()="figure" or name()="footer" or name()="form" or name()="frame" or name()="frameset" or name()="h1" or name()="h2" or name()="h3" or name()="h4" or name()="h5" or name()="h6" or name()="head" or name()="header" or name()="hr" or name()="html" or name()="isindex" or name()="li" or name()="link" or name()="main" or name()="meta" or name()="nav" or name()="ol" or name()="p" or name()="picture" or name()="pre" or name()="section" or name()="script" or name()="source" or name()="style" or name()="table" or name()="td" or name()="tfoot" or name()="th" or name()="thead" or name()="title" or name()="tr" or name()="ul"][1])';
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/** Serializes an HTML DOM node to a string. This is equivalent to the outerHTML getter
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*
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* @param \DOMDocument|\DOMElement|\DOMText|\DOMComment|\DOMProcessingInstruction|\DOMDocumentFragment|\DOMDocumentType $node The node to serialize
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* @param \MensBeam\HTML\Parser\Config|null $config The configuration parameters to use, if any
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*/
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public static function serialize(\DOMNode $node, ?Config $config = null): string {
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return self::serializeNode($node, self::configToSerializerState($config));
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}
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/** Serializes the children of an HTML DOM node to a string. This is equivalent to the innerHTML getter
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*
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* @param \DOMDocument|\DOMElement|\DOMDocumentFragment $node The node to serialize
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* @param \MensBeam\HTML\Parser\Config|null $config The configuration parameters to use, if any
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*/
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public static function serializeInner(\DOMNode $node, ?Config $config = null): string {
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return self::serializeInnerNodes($node, self::configToSerializerState($config));
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}
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protected static function serializeInnerNodes(\DOMNode $node, array $serializerState): string {
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# Let s be a string, and initialize it to the empty string.
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$s = '';
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if ($node instanceof \DOMElement && ($node->namespaceURI ?? Parser::HTML_NAMESPACE) === Parser::HTML_NAMESPACE) {
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# If the node serializes as void, then return the empty string.
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if (in_array($node->tagName, self::VOID_ELEMENTS)) {
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return '';
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}
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# If the node is a template element, then let the node instead be the template
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# element's template contents (a DocumentFragment node).
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elseif ($node->tagName === 'template') {
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$node = self::getTemplateContent($node);
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}
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}
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if ($node instanceof \DOMElement || $node instanceof \DOMDocument || $node instanceof \DOMDocumentFragment) {
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# For each child node of the node, in tree order, run the following steps:
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// NOTE: the steps in question are implemented in the "serialize" routine
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foreach ($node->childNodes as $n) {
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$s .= self::serializeNode($n, $serializerState);
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$serializerState['first'] = false;
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}
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} else {
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throw new Exception(Exception::UNSUPPORTED_NODE_TYPE, [get_class($node)]);
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}
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return $s;
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}
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protected static function serializeNode(\DOMNode $node, array $serializerState): string {
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# 2. Let s be a string, and initialize it to the empty string.
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$s = '';
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# 3. If the node is a template element, then let the node instead be the
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# template element’s template contents (a DocumentFragment node).
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if ($node instanceof \DOMElement) {
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$htmlElement = ($node->namespaceURI ?? Parser::HTML_NAMESPACE) === Parser::HTML_NAMESPACE;
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if ($htmlElement && $node->tagName === 'template') {
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$node = self::getTemplateContent($node);
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}
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}
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# If current node is an Element
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if ($node instanceof \DOMElement) {
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extract($serializerState);
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# If current node is an element in the HTML namespace, the MathML namespace, or
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# the SVG namespace, then let tagname be current node's local name.
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if (in_array($node->namespaceURI ?? Parser::HTML_NAMESPACE, [Parser::HTML_NAMESPACE, Parser::SVG_NAMESPACE, Parser::MATHML_NAMESPACE])) {
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$tagName = self::uncoerceName($node->localName);
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}
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# Otherwise, let tagname be current node's qualified name.
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else {
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$tagName = self::uncoerceName($node->tagName);
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}
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if ($reformatWhitespace) {
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$modify = false;
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$preformattedContent = $preformattedContent ?: self::isPreformattedContent($node);
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// If the node is an HTML element...
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if ($htmlElement) {
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// If the element's parent is to be treated as block then we need to modify
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// whitespace.
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if (!$first && self::treatAsBlock($node->parentNode)) {
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$modify = true;
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}
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}
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// If the node is not an HTML element...
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elseif ($foreignAsBlock) {
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$modify = true;
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} else {
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// If the parent node is null then we need to modify whitespace; this means that
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// it is the element itself that is being serialized. Foreign content without
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// any context is printed as "block" content.
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// If a foreign element with an html element parent and the foreign element
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// should be treated as block then we also need to modify whitespace.
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if ($node->parentNode === null) {
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$modify = true;
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$foreignAsBlock = true;
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} elseif (($node->parentNode->namespaceURI ?? Parser::HTML_NAMESPACE) === Parser::HTML_NAMESPACE) {
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if (self::treatAsBlock($node->parentNode)) {
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$modify = true;
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$foreignAsBlock = true;
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}
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}
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// Otherwise, if the node's parent is not an HTML element then moonwalk up
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// the tree until the root foreign node is found, and if it is to be treated
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// as block then we need to modify whitespace. This should only match when
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// printing non-root foreign elements themselves while also being appended to
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// the document.
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// TODO: Figure out how to make this not fire on every single "inline" svg
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// element.
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elseif (self::treatForeignRootAsBlock($node->parentNode)) {
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$modify = true;
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$foreignAsBlock = true;
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}
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}
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// Only modify here before printing the open tag if it's not the first element
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// printed. Above whether to modify is still partially calculated because if
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// printing just foreign nodes the foreignAsBlock flag needs to be set for any
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// descendants.
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if (!$first && $modify) {
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// If the previous non text or non document type node sibling doesn't have the
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// same name as the current node and neither are h1-h6 elements then add an
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// additional newline. This causes like elements to be grouped together.
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$n = $node;
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while ($n = $n->previousSibling) {
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if (!$n instanceof \DOMText && !$n instanceof \DOMDocumentType) {
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if (!$n instanceof \DOMElement || ($n->tagName !== $tagName && count(array_intersect([ $n->tagName, $tagName ], self::H_ELEMENTS)) !== 2)) {
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$s .= "\n";
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}
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break;
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}
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}
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$s .= "\n" . str_repeat($indentChar, $indentionLevel * $indentStep);
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}
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// Disable whitespace reformatting when the content is preformatted.
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if ($preformattedContent) {
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$reformatWhitespace = false;
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}
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$first = false;
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}
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# Append a U+003C LESS-THAN SIGN character (<), followed by tagname.
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$s .= "<$tagName";
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# If current node's is value is not null, and the element does not have an is
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# attribute in its attribute list, then append the string " is="", followed by
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# current node's is value escaped as described below in attribute mode, followed
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# by a U+0022 QUOTATION MARK character (").
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// DEVIATION: We don't support custom elements
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# For each attribute that the element has, append a U+0020 SPACE character, the
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# attribute's serialized name as described below, a U+003D EQUALS SIGN character (=),
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# a U+0022 QUOTATION MARK character ("), the attribute's value, escaped as
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# described below in attribute mode, and a second U+0022 QUOTATION MARK
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# character (").
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foreach ($node->attributes as $a) {
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# An attribute's serialized name for the purposes of the previous paragraph must
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# be determined as follows:
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# If the attribute has no namespace
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if ($a->namespaceURI === null) {
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# The attribute's serialized name is the attribute's local name.
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$name = self::uncoerceName($a->localName);
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}
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# If the attribute is in the XML namespace
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elseif ($a->namespaceURI === Parser::XML_NAMESPACE) {
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# The attribute's serialized name is the string "xml:" followed
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# by the attribute's local name.
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$name = "xml:".self::uncoerceName($a->localName);
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}
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# If the attribute is in the XMLNS namespace...
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elseif ($a->namespaceURI === Parser::XMLNS_NAMESPACE) {
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# ... and the attribute's local name is xmlns
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if ($a->localName === "xmlns") {
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# The attribute's serialized name is the string "xmlns".
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$name = "xmlns";
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}
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# ... and the attribute's local name is not xmlns
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else {
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# The attribute's serialized name is the string "xmlns:"
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# followed by the attribute's local name.
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$name = "xmlns:".self::uncoerceName($a->localName);
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}
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}
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# If the attribute is in the XLink namespace
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elseif ($a->namespaceURI === Parser::XLINK_NAMESPACE) {
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# The attribute's serialized name is the string "xlink:"
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# followed by the attribute's local name.
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$name = "xlink:".self::uncoerceName($a->localName);
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}
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# If the attribute is in some other namespace
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else {
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# The attribute's serialized name is the attribute's qualified name.
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$name = ($a->prefix !== "") ? $a->prefix.":".$a->name : $a->name;
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}
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// retrieve the attribute value
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$value = self::escapeString((string) $a->value, true);
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if (
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$boolAttr
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|| !$htmlElement
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|| !isset(self::BOOLEAN_ATTRIBUTES[$name])
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|| is_array(self::BOOLEAN_ATTRIBUTES[$name]) && !in_array($tagName, self::BOOLEAN_ATTRIBUTES[$name])
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|| (strlen($value) && strtolower($value) !== $name)
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) {
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// print the attribute value unless the stars align
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$s .= " $name=\"$value\"";
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} else {
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// omit the value if the stars do align
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$s .= " $name";
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}
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}
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$hasChildNodes = $node->hasChildNodes();
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if (!$endTags && !$htmlElement && !$hasChildNodes) {
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$s .= '/>';
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return $s;
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}
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# Append a U+003E GREATER-THAN SIGN character (>).
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$s .= '>';
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# If current node serializes as void, then continue on to the next child node at
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# this point.
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if ($htmlElement && in_array($tagName, self::VOID_ELEMENTS)) {
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return $s;
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}
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if ($hasChildNodes) {
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if ($reformatWhitespace) {
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$indentionLevel++;
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}
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// PHP's compact function sucks. Sorry.
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$state = [
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'boolAttr' => $boolAttr,
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'endTags' => $endTags,
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'reformatWhitespace' => $reformatWhitespace
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];
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if (isset($indentionLevel)) {
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$state['first'] = $first;
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$state['indentionLevel'] = $indentionLevel;
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$state['indentStep'] = $indentStep;
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$state['indentChar'] = $indentChar;
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$state['foreignAsBlock'] = $foreignAsBlock;
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$state['preformattedContent'] = $preformattedContent;
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}
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$s .= self::serializeInnerNodes($node, $state);
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if ($reformatWhitespace) {
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$indentionLevel--;
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if (!$preformattedContent) {
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$modify = false;
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if ($foreignAsBlock) {
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$firstElementChild = null;
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if (property_exists($node, 'firstElementChild')) {
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if ($node->firstElementChild !== null) {
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$modify = true;
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}
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} else {
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$n = $node->firstChild;
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do {
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if ($n instanceof \DOMElement) {
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$modify = true;
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break;
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}
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} while ($n = $n->nextSibling);
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}
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} elseif ($htmlElement && self::treatAsBlock($node)) {
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$modify = true;
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}
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if ($modify) {
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$s .= "\n" . str_repeat($indentChar, $indentionLevel * $indentStep);
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}
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}
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}
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}
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$s .= "</$tagName>";
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}
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# If current node is a Text node
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elseif ($node instanceof \DOMText) {
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# If the parent of current node is a style, script, xmp,
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# iframe, noembed, noframes, or plaintext element, or
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# if the parent of current node is a noscript element
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# and scripting is enabled for the node, then append
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# the value of current node's data IDL attribute literally.
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$p = $node->parentNode;
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if ($p instanceof \DOMElement && ($p->namespaceURI ?? Parser::HTML_NAMESPACE) === Parser::HTML_NAMESPACE && in_array($p->tagName, self::RAWTEXT_ELEMENTS)) {
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// NOTE: scripting is assumed not to be enabled
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$s .= $node->data;
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}
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# Otherwise, append the value of current node's data IDL attribute, escaped as described below.
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else {
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$data = $node->data;
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if ($serializerState['reformatWhitespace']) {
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$preformattedContent = $serializerState['preformattedContent'] ?: self::isPreformattedContent($node);
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if (!$preformattedContent && ($serializerState['foreignAsBlock'] || self::treatAsBlock($node->parentNode)) && strspn($data, Data::WHITESPACE) === strlen($data)) {
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return $s;
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}
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// Condense spaces and tabs into a single space.
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$data = preg_replace('/ +/', ' ', str_replace("\t", ' ', $data));
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}
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$s .= self::escapeString($data);
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}
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}
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# If current node is a Comment
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elseif ($node instanceof \DOMComment) {
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if ($serializerState['reformatWhitespace'] && !$serializerState['first']) {
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$preformattedContent = $serializerState['preformattedContent'] ?: self::isPreformattedContent($node);
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if (!$preformattedContent && ($serializerState['foreignAsBlock'] || self::treatAsBlock($node->parentNode))) {
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$n = $node;
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while ($n = $n->previousSibling) {
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if (!$n instanceof \DOMText) {
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if (!$n instanceof \DOMComment) {
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$s .= "\n";
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}
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break;
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}
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}
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$s .= "\n" . str_repeat($serializerState['indentChar'], $serializerState['indentionLevel'] * $serializerState['indentStep']);
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}
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}
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# Append the literal string "<!--" (U+003C LESS-THAN SIGN, U+0021 EXCLAMATION
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# MARK, U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS), followed by the value of
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# current node’s data IDL attribute, followed by the literal string "-->"
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# (U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN).
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$s .= "<!--{$node->data}-->";
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}
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# If current node is a ProcessingInstruction
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elseif ($node instanceof \DOMProcessingInstruction) {
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if ($serializerState['reformatWhitespace'] && !$serializerState['first']) {
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$preformattedContent = $serializerState['preformattedContent'] ?: self::isPreformattedContent($node);
|
|
if (!$preformattedContent && ($serializerState['foreignAsBlock'] || self::treatAsBlock($node->parentNode))) {
|
|
$n = $node;
|
|
while ($n = $n->previousSibling) {
|
|
if (!$n instanceof \DOMText) {
|
|
if (!$n instanceof \DOMProcessingInstruction) {
|
|
$s .= "\n";
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
$s .= "\n" . str_repeat($serializerState['indentChar'], $serializerState['indentionLevel'] * $serializerState['indentStep']);
|
|
}
|
|
}
|
|
|
|
# Append the literal string "<?" (U+003C LESS-THAN SIGN, U+003F QUESTION MARK),
|
|
# followed by the value of current node’s target IDL attribute, followed by a
|
|
# single U+0020 SPACE character, followed by the value of current node’s data
|
|
# IDL attribute, followed by a single U+003E GREATER-THAN SIGN character (>).
|
|
$s .= '<?' . self::uncoerceName($node->target) . " {$node->data}>";
|
|
}
|
|
# If current node is a DocumentType
|
|
elseif ($node instanceof \DOMDocumentType) {
|
|
if ($serializerState['reformatWhitespace'] && !$serializerState['first']) {
|
|
$s .= "\n";
|
|
}
|
|
|
|
# Append the literal string "<!DOCTYPE" (U+003C LESS-THAN SIGN,
|
|
# U+0021 EXCLAMATION MARK, U+0044 LATIN CAPITAL LETTER D,
|
|
# U+004F LATIN CAPITAL LETTER O, U+0043 LATIN CAPITAL LETTER C,
|
|
# U+0054 LATIN CAPITAL LETTER T, U+0059 LATIN CAPITAL LETTER Y,
|
|
# U+0050 LATIN CAPITAL LETTER P, U+0045 LATIN CAPITAL LETTER E),
|
|
# followed by a space (U+0020 SPACE), followed by the value
|
|
# of current node's name IDL attribute, followed by the
|
|
# literal string ">" (U+003E GREATER-THAN SIGN).
|
|
$s .= '<!DOCTYPE ' . trim($node->name) . '>';
|
|
}
|
|
// NOTE: Documents and document fragments have no outer content,
|
|
// so we can just serialize the inner content
|
|
elseif ($node instanceof \DOMDocument || $node instanceof \DOMDocumentFragment) {
|
|
return self::serializeInnerNodes($node, $serializerState);
|
|
} else {
|
|
throw new Exception(Exception::UNSUPPORTED_NODE_TYPE, [get_class($node)]);
|
|
}
|
|
|
|
return $s;
|
|
}
|
|
|
|
protected static function configToSerializerState(?Config $config = null): array {
|
|
$state = [
|
|
'boolAttr' => true,
|
|
'endTags' => true,
|
|
'reformatWhitespace' => false
|
|
];
|
|
|
|
if ($config !== null) {
|
|
$state = [
|
|
'boolAttr' => $config->serializeBooleanAttributeValues ?? true,
|
|
'endTags' => $config->serializeForeignVoidEndTags ?? true,
|
|
'reformatWhitespace' => $config->reformatWhitespace ?? false
|
|
];
|
|
|
|
if ($state['reformatWhitespace']) {
|
|
$state['first'] = true;
|
|
$state['indentionLevel'] = 0;
|
|
$state['indentStep'] = $config->indentStep ?? 1;
|
|
$state['indentChar'] = ($config->indentWithSpaces ?? true) ? ' ' : "\t";
|
|
$state['foreignAsBlock'] = false;
|
|
$state['preformattedContent'] = false;
|
|
}
|
|
}
|
|
|
|
return $state;
|
|
}
|
|
|
|
protected static function getTemplateContent(\DOMElement $node, ?Config $config = null): \DOMNode {
|
|
// NOTE: PHP's DOM does not support the content property on template elements
|
|
// natively. This method exists purely so implementors of userland PHP DOM
|
|
// solutions may extend this method to get template contents how they need them.
|
|
return $node;
|
|
}
|
|
|
|
protected static function isPreformattedContent(\DOMNode $node): bool {
|
|
// NOTE: This method is used only when pretty printing. Implementors of userland
|
|
// PHP DOM solutions with template contents will need to extend this method to
|
|
// be able to moonwalk through document fragment hosts.
|
|
|
|
$n = $node;
|
|
do {
|
|
if ($n instanceof \DOMElement && ($n->namespaceURI ?? Parser::HTML_NAMESPACE) === Parser::HTML_NAMESPACE && in_array($n->tagName, self::PREFORMATTED_ELEMENTS)) {
|
|
return true;
|
|
}
|
|
} while ($n = $n->parentNode);
|
|
|
|
return false;
|
|
}
|
|
|
|
protected static function treatAsBlock(\DOMNode $node): bool {
|
|
// NOTE: This method is used only when pretty printing. Implementors of userland
|
|
// PHP DOM solutions with template contents will need to extend this method to
|
|
// check for any templates and look within their content fragments for "block"
|
|
// content.
|
|
if ($node instanceof \DOMDocument || $node instanceof \DOMDocumentFragment) {
|
|
return true;
|
|
}
|
|
|
|
$xpath = new \DOMXPath($node->ownerDocument);
|
|
return ($xpath->evaluate(self::BLOCK_QUERY, $node) > 0);
|
|
}
|
|
|
|
protected static function treatForeignRootAsBlock(\DOMNode $node): bool {
|
|
// NOTE: This method is used only when pretty printing. Implementors of userland
|
|
// PHP DOM solutions with template contents will need to extend this method to
|
|
// be able to moonwalk through document fragment hosts.
|
|
$n = $node;
|
|
while ($n = $n->parentNode) {
|
|
if ($n instanceof \DOMDocument || $n instanceof \DOMDocumentFragment || ($n instanceof \DOMElement && $n->parentNode === null)) {
|
|
return true;
|
|
} elseif (($n->parentNode->namespaceURI ?? Parser::HTML_NAMESPACE) === Parser::HTML_NAMESPACE) {
|
|
if (self::treatAsBlock($n->parentNode)) {
|
|
return true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|