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<?php
/**
* @file
* The rules for generating output in the serializer.
*
* These output rules are likely to generate output similar to the document that
* was parsed. It is not intended to output exactly the document that was parsed.
*/
namespace Masterminds\HTML5\Serializer;
use Masterminds\HTML5\Elements;
/**
* Generate the output html5 based on element rules.
*/
class OutputRules implements RulesInterface
{
/**
* Defined in http://www.w3.org/TR/html51/infrastructure.html#html-namespace-0.
*/
const NAMESPACE_HTML = 'http://www.w3.org/1999/xhtml';
const NAMESPACE_MATHML = 'http://www.w3.org/1998/Math/MathML';
const NAMESPACE_SVG = 'http://www.w3.org/2000/svg';
const NAMESPACE_XLINK = 'http://www.w3.org/1999/xlink';
const NAMESPACE_XML = 'http://www.w3.org/XML/1998/namespace';
const NAMESPACE_XMLNS = 'http://www.w3.org/2000/xmlns/';
/**
* Holds the HTML5 element names that causes a namespace switch.
*
* @var array
*/
protected $implicitNamespaces = array(
self::NAMESPACE_HTML,
self::NAMESPACE_SVG,
self::NAMESPACE_MATHML,
self::NAMESPACE_XML,
self::NAMESPACE_XMLNS,
);
const IM_IN_HTML = 1;
const IM_IN_SVG = 2;
const IM_IN_MATHML = 3;
/**
* Used as cache to detect if is available ENT_HTML5.
*
* @var bool
*/
private $hasHTML5 = false;
protected $traverser;
protected $encode = false;
protected $out;
protected $outputMode;
private $xpath;
protected $nonBooleanAttributes = array(
/*
array(
'nodeNamespace'=>'http://www.w3.org/1999/xhtml',
'attrNamespace'=>'http://www.w3.org/1999/xhtml',
'nodeName'=>'img', 'nodeName'=>array('img', 'a'),
'attrName'=>'alt', 'attrName'=>array('title', 'alt'),
),
*/
array(
'nodeNamespace' => 'http://www.w3.org/1999/xhtml',
'attrName' => array('href',
'hreflang',
'http-equiv',
'icon',
'id',
'keytype',
'kind',
'label',
'lang',
'language',
'list',
'maxlength',
'media',
'method',
'name',
'placeholder',
'rel',
'rows',
'rowspan',
'sandbox',
'spellcheck',
'scope',
'seamless',
'shape',
'size',
'sizes',
'span',
'src',
'srcdoc',
'srclang',
'srcset',
'start',
'step',
'style',
'summary',
'tabindex',
'target',
'title',
'type',
'value',
'width',
'border',
'charset',
'cite',
'class',
'code',
'codebase',
'color',
'cols',
'colspan',
'content',
'coords',
'data',
'datetime',
'default',
'dir',
'dirname',
'enctype',
'for',
'form',
'formaction',
'headers',
'height',
'accept',
'accept-charset',
'accesskey',
'action',
'align',
'alt',
'bgcolor',
),
),
array(
'nodeNamespace' => 'http://www.w3.org/1999/xhtml',
'xpath' => 'starts-with(local-name(), \'data-\')',
),
);
const DOCTYPE = '<!DOCTYPE html>';
public function __construct($output, $options = array())
{
if (isset($options['encode_entities'])) {
$this->encode = $options['encode_entities'];
}
$this->outputMode = static::IM_IN_HTML;
$this->out = $output;
$this->hasHTML5 = defined('ENT_HTML5');
}
public function addRule(array $rule)
{
$this->nonBooleanAttributes[] = $rule;
}
public function setTraverser(Traverser $traverser)
{
$this->traverser = $traverser;
return $this;
}
public function unsetTraverser()
{
$this->traverser = null;
return $this;
}
public function document($dom)
{
$this->doctype();
if ($dom->documentElement) {
foreach ($dom->childNodes as $node) {
$this->traverser->node($node);
}
$this->nl();
}
}
protected function doctype()
{
$this->wr(static::DOCTYPE);
$this->nl();
}
public function element($ele)
{
$name = $ele->tagName;
// Per spec:
// If the element has a declared namespace in the HTML, MathML or
// SVG namespaces, we use the lname instead of the tagName.
if ($this->traverser->isLocalElement($ele)) {
$name = $ele->localName;
}
// If we are in SVG or MathML there is special handling.
// Using if/elseif instead of switch because it's faster in PHP.
if ('svg' == $name) {
$this->outputMode = static::IM_IN_SVG;
$name = Elements::normalizeSvgElement($name);
} elseif ('math' == $name) {
$this->outputMode = static::IM_IN_MATHML;
}
$this->openTag($ele);
if (Elements::isA($name, Elements::TEXT_RAW)) {
foreach ($ele->childNodes as $child) {
if ($child instanceof \DOMCharacterData) {
$this->wr($child->data);
} elseif ($child instanceof \DOMElement) {
$this->element($child);
}
}
} else {
// Handle children.
if ($ele->hasChildNodes()) {
$this->traverser->children($ele->childNodes);
}
// Close out the SVG or MathML special handling.
if ('svg' == $name || 'math' == $name) {
$this->outputMode = static::IM_IN_HTML;
}
}
// If not unary, add a closing tag.
if (!Elements::isA($name, Elements::VOID_TAG)) {
$this->closeTag($ele);
}
}
/**
* Write a text node.
*
* @param \DOMText $ele The text node to write.
*/
public function text($ele)
{
if (isset($ele->parentNode) && isset($ele->parentNode->tagName) && Elements::isA($ele->parentNode->localName, Elements::TEXT_RAW)) {
$this->wr($ele->data);
return;
}
// FIXME: This probably needs some flags set.
$this->wr($this->enc($ele->data));
}
public function cdata($ele)
{
// This encodes CDATA.
$this->wr($ele->ownerDocument->saveXML($ele));
}
public function comment($ele)
{
// These produce identical output.
// $this->wr('<!--')->wr($ele->data)->wr('-->');
$this->wr($ele->ownerDocument->saveXML($ele));
}
public function processorInstruction($ele)
{
$this->wr('<?')
->wr($ele->target)
->wr(' ')
->wr($ele->data)
->wr('?>');
}
/**
* Write the namespace attributes.
*
* @param \DOMNode $ele The element being written.
*/
protected function namespaceAttrs($ele)
{
if (!$this->xpath || $this->xpath->document !== $ele->ownerDocument) {
$this->xpath = new \DOMXPath($ele->ownerDocument);
}
foreach ($this->xpath->query('namespace::*[not(.=../../namespace::*)]', $ele) as $nsNode) {
if (!in_array($nsNode->nodeValue, $this->implicitNamespaces)) {
$this->wr(' ')->wr($nsNode->nodeName)->wr('="')->wr($nsNode->nodeValue)->wr('"');
}
}
}
/**
* Write the opening tag.
*
* Tags for HTML, MathML, and SVG are in the local name. Otherwise, use the
* qualified name (8.3).
*
* @param \DOMNode $ele The element being written.
*/
protected function openTag($ele)
{
$this->wr('<')->wr($this->traverser->isLocalElement($ele) ? $ele->localName : $ele->tagName);
$this->attrs($ele);
$this->namespaceAttrs($ele);
if ($this->outputMode == static::IM_IN_HTML) {
$this->wr('>');
} // If we are not in html mode we are in SVG, MathML, or XML embedded content.
else {
if ($ele->hasChildNodes()) {
$this->wr('>');
} // If there are no children this is self closing.
else {
$this->wr(' />');
}
}
}
protected function attrs($ele)
{
// FIXME: Needs support for xml, xmlns, xlink, and namespaced elements.
if (!$ele->hasAttributes()) {
return $this;
}
// TODO: Currently, this always writes name="value", and does not do
// value-less attributes.
$map = $ele->attributes;
$len = $map->length;
for ($i = 0; $i < $len; ++$i) {
$node = $map->item($i);
$val = $this->enc($node->value, true);
// XXX: The spec says that we need to ensure that anything in
// the XML, XMLNS, or XLink NS's should use the canonical
// prefix. It seems that DOM does this for us already, but there
// may be exceptions.
$name = $node->nodeName;
// Special handling for attributes in SVG and MathML.
// Using if/elseif instead of switch because it's faster in PHP.
if ($this->outputMode == static::IM_IN_SVG) {
$name = Elements::normalizeSvgAttribute($name);
} elseif ($this->outputMode == static::IM_IN_MATHML) {
$name = Elements::normalizeMathMlAttribute($name);
}
$this->wr(' ')->wr($name);
if ((isset($val) && '' !== $val) || $this->nonBooleanAttribute($node)) {
$this->wr('="')->wr($val)->wr('"');
}
}
}
protected function nonBooleanAttribute(\DOMAttr $attr)
{
$ele = $attr->ownerElement;
foreach ($this->nonBooleanAttributes as $rule) {
if (isset($rule['nodeNamespace']) && $rule['nodeNamespace'] !== $ele->namespaceURI) {
continue;
}
if (isset($rule['attNamespace']) && $rule['attNamespace'] !== $attr->namespaceURI) {
continue;
}
if (isset($rule['nodeName']) && !is_array($rule['nodeName']) && $rule['nodeName'] !== $ele->localName) {
continue;
}
if (isset($rule['nodeName']) && is_array($rule['nodeName']) && !in_array($ele->localName, $rule['nodeName'], true)) {
continue;
}
if (isset($rule['attrName']) && !is_array($rule['attrName']) && $rule['attrName'] !== $attr->localName) {
continue;
}
if (isset($rule['attrName']) && is_array($rule['attrName']) && !in_array($attr->localName, $rule['attrName'], true)) {
continue;
}
if (isset($rule['xpath'])) {
$xp = $this->getXPath($attr);
if (isset($rule['prefixes'])) {
foreach ($rule['prefixes'] as $nsPrefix => $ns) {
$xp->registerNamespace($nsPrefix, $ns);
}
}
if (!$xp->evaluate($rule['xpath'], $attr)) {
continue;
}
}
return true;
}
return false;
}
private function getXPath(\DOMNode $node)
{
if (!$this->xpath) {
$this->xpath = new \DOMXPath($node->ownerDocument);
}
return $this->xpath;
}
/**
* Write the closing tag.
*
* Tags for HTML, MathML, and SVG are in the local name. Otherwise, use the
* qualified name (8.3).
*
* @param \DOMNode $ele The element being written.
*/
protected function closeTag($ele)
{
if ($this->outputMode == static::IM_IN_HTML || $ele->hasChildNodes()) {
$this->wr('</')->wr($this->traverser->isLocalElement($ele) ? $ele->localName : $ele->tagName)->wr('>');
}
}
/**
* Write to the output.
*
* @param string $text The string to put into the output
*
* @return $this
*/
protected function wr($text)
{
fwrite($this->out, $text);
return $this;
}
/**
* Write a new line character.
*
* @return $this
*/
protected function nl()
{
fwrite($this->out, PHP_EOL);
return $this;
}
/**
* Encode text.
*
* When encode is set to false, the default value, the text passed in is
* escaped per section 8.3 of the html5 spec. For details on how text is
* escaped see the escape() method.
*
* When encoding is set to true the text is converted to named character
* references where appropriate. Section 8.1.4 Character references of the
* html5 spec refers to using named character references. This is useful for
* characters that can't otherwise legally be used in the text.
*
* The named character references are listed in section 8.5.
*
* @see http://www.w3.org/TR/2013/CR-html5-20130806/syntax.html#named-character-references True encoding will turn all named character references into their entities.
* This includes such characters as +.# and many other common ones. By default
* encoding here will just escape &'<>".
*
* Note, PHP 5.4+ has better html5 encoding.
*
* @todo Use the Entities class in php 5.3 to have html5 entities.
*
* @param string $text Text to encode.
* @param bool $attribute True if we are encoding an attrubute, false otherwise.
*
* @return string The encoded text.
*/
protected function enc($text, $attribute = false)
{
// Escape the text rather than convert to named character references.
if (!$this->encode) {
return $this->escape($text, $attribute);
}
// If we are in PHP 5.4+ we can use the native html5 entity functionality to
// convert the named character references.
if ($this->hasHTML5) {
return htmlentities($text, ENT_HTML5 | ENT_SUBSTITUTE | ENT_QUOTES, 'UTF-8', false);
} // If a version earlier than 5.4 html5 entities are not entirely handled.
// This manually handles them.
else {
return strtr($text, HTML5Entities::$map);
}
}
/**
* Escape test.
*
* According to the html5 spec section 8.3 Serializing HTML fragments, text
* within tags that are not style, script, xmp, iframe, noembed, and noframes
* need to be properly escaped.
*
* The & should be converted to &, no breaking space unicode characters
* converted to , when in attribute mode the " should be converted to
* ", and when not in attribute mode the < and > should be converted to
* < and >.
*
* @see http://www.w3.org/TR/2013/CR-html5-20130806/syntax.html#escapingString
*
* @param string $text Text to escape.
* @param bool $attribute True if we are escaping an attrubute, false otherwise.
*/
protected function escape($text, $attribute = false)
{
// Not using htmlspecialchars because, while it does escaping, it doesn't
// match the requirements of section 8.5. For example, it doesn't handle
// non-breaking spaces.
if ($attribute) {
$replace = array(
'"' => '"',
'&' => '&',
"\xc2\xa0" => ' ',
);
} else {
$replace = array(
'<' => '<',
'>' => '>',
'&' => '&',
"\xc2\xa0" => ' ',
);
}
return strtr($text, $replace);
}
}
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