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ve.utils.parsing.js
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ve.utils.parsing.js
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/*!
* VisualEditor parsing utilities, used when converting HTMLDocuments and strings.
*
* @copyright See AUTHORS.txt
*/
/**
* Check whether a given DOM element has a block element type.
*
* @param {HTMLElement|string} element Element or element name
* @return {boolean} Element is a block element
*/
ve.isBlockElement = function ( element ) {
const elementName = typeof element === 'string' ? element : element.nodeName;
return ve.elementTypes.block.indexOf( elementName.toLowerCase() ) !== -1;
};
/**
* Check whether a given DOM element is a void element (can't have children).
*
* @param {HTMLElement|string} element Element or element name
* @return {boolean} Element is a void element
*/
ve.isVoidElement = function ( element ) {
const elementName = typeof element === 'string' ? element : element.nodeName;
return ve.elementTypes.void.indexOf( elementName.toLowerCase() ) !== -1;
};
ve.elementTypes = {
block: [
'div', 'p',
// Tables
'table', 'tbody', 'thead', 'tfoot', 'caption', 'th', 'tr', 'td',
// Lists
'ul', 'ol', 'li', 'dl', 'dt', 'dd',
// HTML5 heading content
'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hgroup',
// HTML5 sectioning content
'article', 'aside', 'body', 'nav', 'section', 'footer', 'header', 'figure',
'figcaption', 'fieldset', 'details', 'blockquote',
// Other
'hr', 'button', 'canvas', 'center', 'col', 'colgroup', 'embed',
'map', 'object', 'pre', 'progress', 'video'
],
void: [
// https://html.spec.whatwg.org/#void-elements
'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input',
'link', 'meta', 'param', 'source', 'track', 'wbr'
]
};
/**
* Match a specific HTML tag that appears once, e.g. 'html' or 'body'
*
* @param {string} html Document HTML
* @param {string} tag Tag name
* @return {string[]|null} Regex match, null if not found
*/
ve.matchTag = function ( html, tag ) {
return html.match(
new RegExp( '<' + tag + '(>|\\s[^>]*>)' )
);
};
/**
* Add a tag to `<head>` using HTML string splicing
*
* @param {string} docHtml Document HTML
* @param {string} tagHtml Tag HTML to be added to `<head>`
* @return {string} Document HTML
*/
ve.addHeadTag = function ( docHtml, tagHtml ) {
/**
* Splice text after a regex match
*
* @param {string[]} match Regex match
* @param {string} text Text to insert
* @return {string}
*/
function insertAfter( match, text ) {
const offset = match.index + match[ 0 ].length;
return docHtml.slice( 0, offset ) +
text +
docHtml.slice( offset );
}
const headMatch = ve.matchTag( docHtml, 'head' );
if ( headMatch ) {
return insertAfter( headMatch, tagHtml );
} else {
const htmlMatch = ve.matchTag( docHtml, 'html' );
if ( htmlMatch ) {
// <html> but no <head>
return insertAfter( htmlMatch, '<head>' + tagHtml + '</head>' );
} else {
// No <html> or </head>
return '<head>' + tagHtml + '</head>' + docHtml;
}
}
};
/**
* Create an HTMLDocument from an HTML string.
*
* The html parameter is supposed to be a full HTML document with a doctype and an `<html>` tag.
* If you pass a document fragment, it will be wrapped in `<body>…</body>`.
*
* To create an empty document, pass the empty string.
*
* If your input is both valid HTML and valid XML, and you need to work around style
* normalization bugs in Internet Explorer, use #parseXhtml and #serializeXhtml.
*
* @param {string} html
* @return {HTMLDocument} Document constructed from the HTML string
*/
ve.createDocumentFromHtml = function ( html ) {
if ( html !== '' ) {
if ( !ve.matchTag( html, 'body' ) ) {
// When the given HTML fragment starts with a <meta> or <style> element, it is placed in the
// automatically generated <head> rather than <body>, and breaks our assumptions. (T273234)
html = '<body>' + html + '</body>';
}
// Add iOS hack (T116525)
html = ve.addHeadTag( html, '<meta name="format-detection" content="telephone=no" data-ve-tmp/>' );
}
const newDocument = new DOMParser().parseFromString( html, 'text/html' );
// Remove iOS hack
const tmpMeta = newDocument.querySelector( 'meta[data-ve-tmp]' );
if ( tmpMeta ) {
tmpMeta.parentNode.removeChild( tmpMeta );
}
return newDocument;
};
/**
* Take a target document with a possibly relative base URL, and modify it to be absolute.
* The base URL of the target document is resolved using the base URL of the source document.
*
* Note that the fallbackBase parameter will be used if there is no <base> tag, even if
* the document does have a valid base URL: this is to work around Firefox's behavior of having
* documents created by DOMParser inherit the base URL of the main document.
*
* @param {HTMLDocument} targetDoc Document whose base URL should be resolved
* @param {HTMLDocument} sourceDoc Document whose base URL should be used for resolution
* @param {string} [fallbackBase] Base URL to use if resolving the base URL fails or there is no <base> tag
*/
ve.fixBase = function ( targetDoc, sourceDoc, fallbackBase ) {
let baseNode = targetDoc.getElementsByTagName( 'base' )[ 0 ];
if ( baseNode ) {
// Support: Safari
// In Safari a base node with an invalid href (e.g. protocol-relative)
// in a document which has been dynamically created results in
// 'about:blank' rather than '' or null. The base's href will also be '',
// but that works out just setting the base to fallbackBase, so it's okay.
if ( !targetDoc.baseURI || targetDoc.baseURI === 'about:blank' ) {
// <base> tag present but not valid, try resolving its URL
baseNode.setAttribute( 'href', ve.resolveUrl( baseNode.getAttribute( 'href' ), sourceDoc ) );
if ( !targetDoc.baseURI && fallbackBase ) {
// That didn't work, use the fallback
baseNode.setAttribute( 'href', fallbackBase );
}
}
// Support: Chrome
// Chrome just entirely ignores <base> tags with a protocol-relative href attribute.
// Code below is *not a no-op*; reading the href property and setting it back
// will expand the href *attribute* to use an absolute URL if it was relative.
// eslint-disable-next-line no-self-assign
baseNode.href = baseNode.href;
} else if ( fallbackBase ) {
// Support: Firefox
// No <base> tag, add one
baseNode = targetDoc.createElement( 'base' );
baseNode.setAttribute( 'href', fallbackBase );
targetDoc.head.appendChild( baseNode );
}
};
/**
* Get the actual inner HTML of a DOM node.
*
* In most browsers, .innerHTML is broken and eats newlines in `<pre>` elements, see
* https://bugzilla.mozilla.org/show_bug.cgi?id=838954 . This function detects this behavior
* and works around it, to the extent possible. `<pre>\nFoo</pre>` will become `<pre>Foo</pre>`
* if the browser is broken, but newlines are preserved in all other cases.
*
* @param {HTMLElement} element HTML element to get inner HTML of
* @return {string} Inner HTML
*/
ve.properInnerHtml = function ( element ) {
return ve.fixupPreBug( element ).innerHTML;
};
/**
* Get the actual outer HTML of a DOM node.
*
* @see ve.properInnerHtml
* @param {HTMLElement} element HTML element to get outer HTML of
* @return {string} Outer HTML
*/
ve.properOuterHtml = function ( element ) {
return ve.fixupPreBug( element ).outerHTML;
};
/**
* Helper function for #properInnerHtml, #properOuterHtml and #serializeXhtml.
*
* Detect whether the browser has broken `<pre>` serialization, and if so return a clone
* of the node with extra newlines added to make it serialize properly. If the browser is not
* broken, just return the original node.
*
* @param {HTMLElement} element HTML element to fix up
* @return {HTMLElement} Either element, or a fixed-up clone of it
*/
ve.fixupPreBug = function ( element ) {
// Support: Chrome, FF
if ( ve.isPreInnerHtmlBroken === undefined ) {
// Test whether newlines in `<pre>` are serialized back correctly
const div = document.createElement( 'div' );
div.innerHTML = '<pre>\n\n</pre>';
ve.isPreInnerHtmlBroken = div.innerHTML === '<pre>\n</pre>';
}
if ( !ve.isPreInnerHtmlBroken ) {
return element;
}
// Workaround for T44469: if a `<pre>` starts with a newline, that means .innerHTML will
// screw up and stringify it with one fewer newline. Work around this by adding a newline.
// If we don't see a leading newline, we still don't know if the original HTML was
// `<pre>Foo</pre>` or `<pre>\nFoo</pre>`, but that's a syntactic difference, not a
// semantic one, and handling that is the integration target's job.
const $element = $( element ).clone();
$element.find( 'pre, textarea, listing' ).each( ( i, el ) => {
let matches;
if ( el.firstChild && el.firstChild.nodeType === Node.TEXT_NODE ) {
matches = el.firstChild.data.match( /^(\r\n|\r|\n)/ );
if ( matches && matches[ 1 ] ) {
// Prepend a newline exactly like the one we saw
el.firstChild.insertData( 0, matches[ 1 ] );
}
}
} );
return $element.get( 0 );
};
/**
* Helper function for #transformStyleAttributes.
*
* Normalize an attribute value. In compliant browsers, this should be
* a no-op, but in IE style attributes are normalized on all elements,
* color and bgcolor attributes are normalized on some elements (like `<tr>`),
* and width and height attributes are normalized on some elements( like `<table>`).
*
* @param {string} name Attribute name
* @param {string} value Attribute value
* @param {string} [nodeName='div'] Element name
* @return {string} Normalized attribute value
*/
ve.normalizeAttributeValue = function ( name, value, nodeName ) {
const node = document.createElement( nodeName || 'div' );
node.setAttribute( name, value );
return node.getAttribute( name );
};
/**
* Resolve a URL relative to a given base.
*
* @param {string} url URL to resolve
* @param {HTMLDocument} base Document whose base URL to use
* @return {string} Resolved URL
*/
ve.resolveUrl = function ( url, base ) {
const node = base.createElement( 'a' );
node.setAttribute( 'href', url );
// If doc.baseURI isn't set, node.href will be an empty string
// This is crazy, returning the original URL is better
return node.href || url;
};

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