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* VisualEditor utilities.
*
* @copyright See AUTHORS.txt
*/
/**
* @class ve
*/
/**
* Checks if an object is an instance of one or more classes.
*
* @param {Object} subject Object to check
* @param {Function[]} classes Classes to compare with
* @return {boolean} Object inherits from one or more of the classes
*/
ve.isInstanceOfAny = function ( subject, classes ) {
var i = classes.length;
while ( classes[ --i ] ) {
if ( subject instanceof classes[ i ] ) {
return true;
}
}
return false;
};
/**
* Get a deeply nested property of an object using variadic arguments, protecting against
* undefined property errors.
*
* `quux = OO.getProp( obj, 'foo', 'bar', 'baz' );` is equivalent to `quux = obj.foo.bar.baz;`
* except that the former protects against JS errors if one of the intermediate properties
* is undefined. Instead of throwing an error, this function will return undefined in
* that case.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object} obj
* @param {...Mixed} [keys]
* @return {Object|undefined} obj[arguments[1]][arguments[2]].... or undefined
*/
ve.getProp = OO.getProp;
/**
* Set a deeply nested property of an object using variadic arguments, protecting against
* undefined property errors.
*
* `OO.setProp( obj, 'foo', 'bar', 'baz' );` is equivalent to `obj.foo.bar = baz;` except that
* the former protects against JS errors if one of the intermediate properties is
* undefined. Instead of throwing an error, undefined intermediate properties will be
* initialized to an empty object. If an intermediate property is not an object, or if obj itself
* is not an object, this function will silently abort.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object} obj
* @param {...Mixed} [keys]
* @param {Mixed} [value]
*/
ve.setProp = OO.setProp;
/**
* Delete a deeply nested property of an object using variadic arguments, protecting against
* undefined property errors, and deleting resulting empty objects.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object} obj
* @param {...Mixed} [keys]
*/
ve.deleteProp = OO.deleteProp;
/**
* Create a new object that is an instance of the same
* constructor as the input, inherits from the same object
* and contains the same own properties.
*
* This makes a shallow non-recursive copy of own properties.
* To create a recursive copy of plain objects, use #copy.
*
* var foo = new Person( mom, dad );
* foo.setAge( 21 );
* var foo2 = OO.cloneObject( foo );
* foo.setAge( 22 );
*
* // Then
* foo2 !== foo; // true
* foo2 instanceof Person; // true
* foo2.getAge(); // 21
* foo.getAge(); // 22
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object} origin
* @return {Object} Clone of origin
*/
ve.cloneObject = OO.cloneObject;
/**
* Get an array of all property values in an object.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object} obj Object to get values from
* @return {Array} List of object values
*/
ve.getObjectValues = OO.getObjectValues;
/**
* Use binary search to locate an element in a sorted array.
*
* searchFunc is given an element from the array. `searchFunc(elem)` must return a number
* above 0 if the element we're searching for is to the right of (has a higher index than) elem,
* below 0 if it is to the left of elem, or zero if it's equal to elem.
*
* To search for a specific value with a comparator function (a `function cmp(a,b)` that returns
* above 0 if `a > b`, below 0 if `a < b`, and 0 if `a == b`), you can use
* `searchFunc = cmp.bind( null, value )`.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Array} arr Array to search in
* @param {Function} searchFunc Search function
* @param {boolean} [forInsertion] If not found, return index where val could be inserted
* @return {number|null} Index where val was found, or null if not found
*/
ve.binarySearch = OO.binarySearch;
/**
* Recursively compare properties between two objects.
*
* A false result may be caused by property inequality or by properties in one object missing from
* the other. An asymmetrical test may also be performed, which checks only that properties in the
* first object are present in the second object, but not the inverse.
*
* If either a or b is null or undefined it will be treated as an empty object.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object|undefined|null} a First object to compare
* @param {Object|undefined|null} b Second object to compare
* @param {boolean} [asymmetrical] Whether to check only that a's values are equal to b's
* (i.e. a is a subset of b)
* @return {boolean} If the objects contain the same values as each other
*/
ve.compare = OO.compare;
/**
* Create a plain deep copy of any kind of object.
*
* Copies are deep, and will either be an object or an array depending on `source`.
*
* See https://doc.wikimedia.org/oojs/master/OO.html
*
* @method
* @param {Object} source Object to copy
* @param {Function} [leafCallback] Applied to leaf values after they are cloned but before they are
* added to the clone
* @param {Function} [nodeCallback] Applied to all values before they are cloned. If the
* nodeCallback returns a value other than undefined, the returned value is used instead of
* attempting to clone.
* @return {Object} Copy of source object
*/
ve.copy = OO.copy;
/**
* @method
* @inheritdoc OO.ui#debounce
*/
ve.debounce = OO.ui.debounce;
/**
* @method
* @inheritdoc OO.ui#throttle
*/
ve.throttle = OO.ui.throttle;
/**
* Create a jQuery.Deferred-compatible object
*
* See http://api.jquery.com/jQuery.Deferred/
*
* @method
* @return {jQuery.Deferred}
*/
ve.createDeferred = $.Deferred;
/**
* Create a promise which resolves when the list of promises has resolved
*
* @param {jQuery.Promise[]} promises List of promises
* @return {jQuery.Promise} Promise which resolves when the list of promises has resolved
*/
ve.promiseAll = function ( promises ) {
return $.when.apply( $, promises );
};
/**
* Copy an array of DOM elements, optionally into a different document.
*
* @param {HTMLElement[]} domElements DOM elements to copy
* @param {HTMLDocument} [doc] Document to create the copies in; if unset, simply clone each element
* @return {HTMLElement[]} Copy of domElements with copies of each element
*/
ve.copyDomElements = function ( domElements, doc ) {
return domElements.map( function ( domElement ) {
return doc ? doc.importNode( domElement, true ) : domElement.cloneNode( true );
} );
};
/**
* Check if two arrays of DOM elements are equal (according to .isEqualNode())
*
* @param {HTMLElement[]} domElements1 First array of DOM elements
* @param {HTMLElement[]} domElements2 Second array of DOM elements
* @return {boolean} All elements are pairwise equal
*/
ve.isEqualDomElements = function ( domElements1, domElements2 ) {
var i = 0,
len = domElements1.length;
if ( len !== domElements2.length ) {
return false;
}
for ( ; i < len; i++ ) {
if ( !domElements1[ i ].isEqualNode( domElements2[ i ] ) ) {
return false;
}
}
return true;
};
/**
* Compare two class lists, either whitespace separated strings or arrays
*
* Class lists are equivalent if they contain the same members,
* excluding duplicates and ignoring order.
*
* @param {string[]|string} classList1 First class list
* @param {string[]|string} classList2 Second class list
* @return {boolean} Class lists are equivalent
*/
ve.compareClassLists = function ( classList1, classList2 ) {
var removeEmpty = function ( c ) {
return c !== '';
};
classList1 = Array.isArray( classList1 ) ? classList1 : classList1.trim().split( /\s+/ );
classList2 = Array.isArray( classList2 ) ? classList2 : classList2.trim().split( /\s+/ );
classList1 = classList1.filter( removeEmpty );
classList2 = classList2.filter( removeEmpty );
return ve.compare( OO.unique( classList1 ).sort(), OO.unique( classList2 ).sort() );
};
/**
* Check to see if an object is a plain object (created using "{}" or "new Object").
*
* See http://api.jquery.com/jQuery.isPlainObject/
*
* @method
* @param {Object} obj The object that will be checked to see if it's a plain object
* @return {boolean}
*/
ve.isPlainObject = $.isPlainObject;
/**
* Check to see if an object is empty (contains no properties).
*
* See http://api.jquery.com/jQuery.isEmptyObject/
*
* @method
* @param {Object} obj The object that will be checked to see if it's empty
* @return {boolean}
*/
ve.isEmptyObject = $.isEmptyObject;
/**
* Merge properties of one or more objects into another.
* Preserves original object's inheritance (e.g. Array, Object, whatever).
* In case of array or array-like objects only the indexed properties
* are copied over.
* Beware: If called with only one argument, it will consider
* 'target' as 'source' and 'this' as 'target'. Which means
* ve.extendObject( { a: 1 } ); sets ve.a = 1;
*
* See http://api.jquery.com/jQuery.extend/
*
* @method
* @param {boolean} [recursive=false]
* @param {Mixed} [target] Object that will receive the new properties
* @param {...Mixed} [sources] Variadic list of objects containing properties
* to be merged into the target.
* @return {Mixed} Modified version of first or second argument
*/
ve.extendObject = $.extend;
/**
* Splice one array into another.
*
* This is the equivalent of arr.splice( offset, remove, d1, d2, d3, … ) except that arguments are
* specified as an array rather than separate parameters.
*
* This method has been proven to be faster than using slice and concat to create a new array, but
* performance tests should be conducted on each use of this method to verify this is true for the
* particular use. Also, browsers change fast, never assume anything, always test everything.
*
* Includes a replacement for broken implementations of Array.prototype.splice().
*
* @param {Array|ve.dm.BranchNode} arr Target object (must have `splice` method, object will be modified)
* @param {number} offset Offset in arr to splice at. This MUST NOT be negative, unlike the
* 'index' parameter in Array#splice.
* @param {number} remove Number of elements to remove at the offset. May be zero
* @param {Array} data Array of items to insert at the offset. Must be non-empty if remove=0
* @return {Array} Array of items removed
*/
ve.batchSplice = function ( arr, offset, remove, data ) {
// We need to splice insertion in in batches, because of parameter list length limits which vary
// cross-browser - 1024 seems to be a safe batch size on all browsers
var index = 0,
batchSize = 1024,
toRemove = remove,
removed = [];
var splice;
if ( !Array.isArray( arr ) ) {
splice = arr.splice;
} else {
splice = Array.prototype.splice;
}
if ( data.length === 0 ) {
// Special case: data is empty, so we're just doing a removal
// The code below won't handle that properly, so we do it here
return splice.call( arr, offset, remove );
}
while ( index < data.length ) {
// Call arr.splice( offset, remove, i0, i1, i2, …, i1023 );
// Only set remove on the first call, and set it to zero on subsequent calls
var spliced = splice.apply(
arr, [ index + offset, toRemove ].concat( data.slice( index, index + batchSize ) )
);
if ( toRemove > 0 ) {
removed = spliced;
}
index += batchSize;
toRemove = 0;
}
return removed;
};
/**
* Splice one array into another, replicating any holes
*
* Similar to arr.splice.apply( arr, [ offset, remove ].concat( data ) ), except holes in
* data remain holes in arr. Optimized for length changes that are negative, zero, or
* fairly small positive.
*
* @param {Array} arr Array to modify
* @param {number} offset Offset in arr to splice at. This MUST NOT be negative, unlike the
* 'index' parameter in Array#splice.
* @param {number} remove Number of elements to remove at the offset. May be zero
* @param {Array} data Array of items to insert at the offset
* @return {Array} Array of items removed, with holes preserved
*/
ve.sparseSplice = function ( arr, offset, remove, data ) {
var removed = [],
endOffset = offset + remove,
diff = data.length - remove;
Iif ( data === arr ) {
// Pathological case: arr and data are reference-identical
data = data.slice();
}
// Remove content without adjusting length
arr.slice( offset, endOffset ).forEach( function ( item, j ) {
removed[ j ] = item;
delete arr[ offset + j ];
} );
// Adjust length
if ( diff > 0 ) {
// Grow with undefined values, then delete. (This is optimised for diff
// comparatively small: otherwise, it would sometimes be quicker to relocate
// each element of arr that lies above offset).
ve.batchSplice( arr, endOffset, 0, new Array( diff ) );
for ( var i = endOffset + diff - 1; i >= endOffset; i-- ) {
delete arr[ i ];
}
} else if ( diff < 0 ) {
// Shrink
arr.splice( offset, -diff );
}
// Insert new content
data.forEach( function ( item, j ) {
arr[ offset + j ] = item;
} );
// Set removed.length in case there are holes at the end
removed.length = remove;
return removed;
};
/**
* Insert one array into another.
*
* Shortcut for `ve.batchSplice( arr, offset, 0, src )`.
*
* @see #batchSplice
* @param {Array|ve.dm.BranchNode} arr Target object (must have `splice` method)
* @param {number} offset Offset in arr where items will be inserted
* @param {Array} src Items to insert at offset
*/
ve.insertIntoArray = function ( arr, offset, src ) {
ve.batchSplice( arr, offset, 0, src );
};
/**
* Push one array into another.
*
* This is the equivalent of arr.push( d1, d2, d3, … ) except that arguments are
* specified as an array rather than separate parameters.
*
* @param {Array|ve.dm.BranchNode} arr Object supporting .push() to insert at the end of the array. Will be modified
* @param {Array} data Array of items to insert.
* @return {number} length of the new array
*/
ve.batchPush = function ( arr, data ) {
// We need to push insertion in batches, because of parameter list length limits which vary
// cross-browser - 1024 seems to be a safe batch size on all browsers
var index = 0,
batchSize = 1024;
if ( batchSize >= data.length ) {
// Avoid slicing for small lists
return arr.push.apply( arr, data );
}
var length;
while ( index < data.length ) {
// Call arr.push( i0, i1, i2, …, i1023 );
length = arr.push.apply(
arr, data.slice( index, index + batchSize )
);
index += batchSize;
}
return length;
};
/**
* Log data to the console.
*
* This implementation does nothing, to add a real implementation ve.debug needs to be loaded.
*
* @param {...Mixed} [args] Data to log
*/
ve.log = ve.log || function () {
// Don't do anything, this is just a stub
};
/**
* Log error to the console.
*
* This implementation does nothing, to add a real implementation ve.debug needs to be loaded.
*
* @param {...Mixed} [args] Data to log
*/
ve.error = ve.error || function () {
// Don't do anything, this is just a stub
};
/**
* Log an object to the console.
*
* This implementation does nothing, to add a real implementation ve.debug needs to be loaded.
*
* @param {Object} obj
*/
ve.dir = ve.dir || function () {
// Don't do anything, this is just a stub
};
/**
* Deep freeze an object, making it immutable
*
* This implementation does nothing, to add a real implementation ve.freeze needs to be loaded.
*
* @param {Object} obj
* @param {boolean} onlyProperties
* @return {Object}
*/
ve.deepFreeze = ve.deepFreeze || function ( obj ) {
// Don't do anything, this is just a stub
return obj;
};
/**
* Get a localized message.
*
* @param {string} key Message key
* @param {...Mixed} [params] Message parameters
* @return {string} Localized message
*/
ve.msg = function () {
// Avoid using bind because ve.init.platform doesn't exist yet.
// TODO: Fix dependency issues between ve.js and ve.init.platform
return ve.init.platform.getMessage.apply( ve.init.platform, arguments );
};
/**
* Get an HTML localized message with HTML or DOM arguments.
*
* @param {string} key Message key
* @param {...Mixed} [params] Message parameters
* @return {Node[]} Localized message
*/
ve.htmlMsg = function () {
// Avoid using bind because ve.init.platform doesn't exist yet.
// TODO: Fix dependency issues between ve.js and ve.init.platform
return ve.init.platform.getHtmlMessage.apply( ve.init.platform, arguments );
};
/**
* Get platform config value(s)
*
* @param {string|string[]} key Config key, or list of keys
* @return {Mixed|Object} Config value, or keyed object of config values if list of keys provided
*/
ve.config = function () {
return ve.init.platform.getConfig.apply( ve.init.platform, arguments );
};
/**
* Get or set a user config value.
*
* @param {string|string[]|Object} key Config key, list of keys or object mapping keys to values
* @param {Mixed} [value] Value to set, if setting and key is a string
* @return {Mixed|Object|boolean} Config value, keyed object of config values if list of keys provided,
* or success boolean if setting.
*/
ve.userConfig = function ( key ) {
if ( arguments.length <= 1 && ( typeof key === 'string' || Array.isArray( key ) ) ) {
// get( string key )
// get( Array keys )
return ve.init.platform.getUserConfig.apply( ve.init.platform, arguments );
} else {
// set( Object values )
// set( key, value )
return ve.init.platform.setUserConfig.apply( ve.init.platform, arguments );
}
};
/**
* Convert a grapheme cluster offset to a byte offset.
*
* @param {string} text Text in which to calculate offset
* @param {number} clusterOffset Grapheme cluster offset
* @return {number} Byte offset
*/
ve.getByteOffset = function ( text, clusterOffset ) {
return unicodeJS.graphemebreak.splitClusters( text )
.slice( 0, clusterOffset )
.join( '' )
.length;
};
/**
* Convert a byte offset to a grapheme cluster offset.
*
* @param {string} text Text in which to calculate offset
* @param {number} byteOffset Byte offset
* @return {number} Grapheme cluster offset
*/
ve.getClusterOffset = function ( text, byteOffset ) {
return unicodeJS.graphemebreak.splitClusters( text.slice( 0, byteOffset ) ).length;
};
/**
* Get a text substring, taking care not to split grapheme clusters.
*
* @param {string} text Text to take the substring from
* @param {number} start Start offset
* @param {number} end End offset
* @param {boolean} [outer=false] Include graphemes if the offset splits them
* @return {string} Substring of text
*/
ve.graphemeSafeSubstring = function ( text, start, end, outer ) {
// TODO: improve performance by incrementally inspecting characters around the offsets
var unicodeStart = ve.getByteOffset( text, ve.getClusterOffset( text, start ) ),
unicodeEnd = ve.getByteOffset( text, ve.getClusterOffset( text, end ) );
// If the selection collapses and we want an inner, then just return empty
// otherwise we'll end up crossing over start and end
if ( unicodeStart === unicodeEnd && !outer ) {
return '';
}
// The above calculations always move to the right of a multibyte grapheme.
// Depending on the outer flag, we may want to move to the left:
if ( unicodeStart > start && outer ) {
unicodeStart = ve.getByteOffset( text, ve.getClusterOffset( text, start ) - 1 );
}
if ( unicodeEnd > end && !outer ) {
unicodeEnd = ve.getByteOffset( text, ve.getClusterOffset( text, end ) - 1 );
}
return text.slice( unicodeStart, unicodeEnd );
};
/**
* Escape non-word characters so they can be safely used as HTML attribute values.
*
* @param {string} value Attribute value to escape
* @return {string} Escaped attribute value
*/
ve.escapeHtml = ( function () {
function escape( value ) {
switch ( value ) {
case '\'':
return ''';
case '"':
return '"';
case '<':
return '<';
case '>':
return '>';
case '&':
return '&';
}
}
return function ( value ) {
return value.replace( /['"<>&]/g, escape );
};
}() );
/**
* Get the attributes of a DOM element as an object with key/value pairs.
*
* @param {HTMLElement} element
* @return {Object}
*/
ve.getDomAttributes = function ( element ) {
var result = {};
for ( var i = 0; i < element.attributes.length; i++ ) {
result[ element.attributes[ i ].name ] = element.attributes[ i ].value;
}
return result;
};
/**
* Set the attributes of a DOM element as an object with key/value pairs.
*
* Use the `null` or `undefined` value to ensure an attribute's absence.
*
* @param {HTMLElement} element DOM element to apply attributes to
* @param {Object} attributes Attributes to apply
* @param {string[]} [allowedAttributes] List of attributes to exclusively allow (all lowercase names)
*/
ve.setDomAttributes = function ( element, attributes, allowedAttributes ) {
// Duck-typing for attribute setting
if ( !element.setAttribute || !element.removeAttribute ) {
return;
}
for ( var key in attributes ) {
if ( allowedAttributes && allowedAttributes.indexOf( key.toLowerCase() ) === -1 ) {
continue;
}
if ( attributes[ key ] === undefined || attributes[ key ] === null ) {
element.removeAttribute( key );
} else {
element.setAttribute( key, attributes[ key ] );
}
}
};
/**
* Get an HTML representation of a DOM element node, text node or comment node
*
* @param {Node} node The DOM node
* @return {string} HTML representation of the node
*/
ve.getNodeHtml = function ( node ) {
if ( node.nodeType === Node.ELEMENT_NODE ) {
return node.outerHTML;
} else {
var div = document.createElement( 'div' );
div.appendChild( node.cloneNode( true ) );
return div.innerHTML;
}
};
/**
* Build a summary of an HTML element.
*
* Summaries include node name, text, attributes and recursive summaries of children.
* Used for serializing or comparing HTML elements.
*
* @private
* @param {HTMLElement} element Element to summarize
* @param {boolean} [includeHtml=false] Include an HTML summary for element nodes
* @param {Function} [getAttributeSummary] Callback to modify the summary of an attribute
* @param {string} [getAttributeSummary.name] Name of the attribute to modify.
* @param {string} [getAttributeSummary.value] Value to return for the given attribute.
* @return {Object} Summary of element.
*/
ve.getDomElementSummary = function ( element, includeHtml, getAttributeSummary ) {
var summary = {
type: element.nodeName.toLowerCase(),
text: element.textContent,
attributes: {},
children: []
};
if ( includeHtml && element.nodeType === Node.ELEMENT_NODE ) {
summary.html = element.outerHTML;
}
var i;
// Gather attributes
if ( element.attributes ) {
for ( i = 0; i < element.attributes.length; i++ ) {
var name = element.attributes[ i ].name;
if ( name === 'about' ) {
// The about attribute is non-deterministic as we generate a new random
// one whenever a node is cloned (see ve.dm.Node.static.cloneElement).
// Exclude it from node comparisons.
continue;
}
var value = element.attributes[ i ].value;
summary.attributes[ name ] = getAttributeSummary ? getAttributeSummary( name, value ) : value;
}
}
// Summarize children
Eif ( element.childNodes ) {
for ( i = 0; i < element.childNodes.length; i++ ) {
summary.children.push( ve.getDomElementSummary( element.childNodes[ i ], includeHtml ) );
}
}
return summary;
};
/**
* Callback for #copy to convert nodes to a comparable summary.
*
* @private
* @param {Object} value Value in the object/array
* @return {Object} DOM element summary if value is a node, otherwise just the value
*/
ve.convertDomElements = function ( value ) {
// Use duck typing rather than instanceof Node; the latter doesn't always work correctly
if ( value && value.nodeType ) {
return ve.getDomElementSummary( value );
}
return value;
};
ve.visibleWhitespaceCharacters = {
'\n': '\u21b5', // ↵
'\t': '\u279e' // ➞
};
/**
* Check whether a given node is contentEditable
*
* Handles 'inherit', via checking isContentEditable. Knows to check for text
* nodes, and will return whether the text node's parent is contentEditable.
*
* @param {HTMLElement|Text} node Node to check contenteditable status of
* @return {boolean} Node is contenteditable
*/
ve.isContentEditable = function ( node ) {
return ( node.nodeType === Node.TEXT_NODE ? node.parentNode : node ).isContentEditable;
};
/**
* Filter out metadata elements
*
* @param {Node[]} contents DOM nodes
* @return {Node[]} Filtered DOM nodes
*/
ve.filterMetaElements = function ( contents ) {
// Filter out link and style tags for T52043
// Previously filtered out meta tags, but restore these as they
// can be made visible with CSS.
// As of jQuery 3 we can't use $.not( 'tagName' ) as that doesn't
// match text nodes. Also we can't $.remove these elements as they
// aren't attached to anything.
contents = contents.filter( function ( node ) {
return node.tagName !== 'LINK' && node.tagName !== 'STYLE';
} );
// Also remove link and style tags nested inside other tags
$( contents ).find( 'link, style' ).remove();
return contents;
};
/**
* Modify a set of DOM elements to resolve attributes in the context of another document.
*
* This performs node.setAttribute( 'attr', nodeInDoc[attr] ); for every node.
*
* Doesn't use jQuery to avoid document switching performance bug
*
* @param {HTMLElement|HTMLElement[]|NodeList|jQuery} elementsOrJQuery Set of DOM elements to modify. Passing a jQuery selector is deprecated.
* @param {HTMLDocument} doc Document to resolve against (different from $elements' .ownerDocument)
* @param {string[]} attrs Attributes to resolve
*/
ve.resolveAttributes = function ( elementsOrJQuery, doc, attrs ) {
// Convert jQuery selections to plain arrays
var elements = elementsOrJQuery.toArray ? elementsOrJQuery.toArray() : elementsOrJQuery;
// Duck typing for array or NodeList :(
if ( elements.length === undefined ) {
elements = [ elements ];
}
var attr;
/**
* Resolves the value of attr to the computed property value.
*
* @private
* @param {HTMLElement} el Element
*/
function resolveAttribute( el ) {
var nodeInDoc = doc.createElement( el.nodeName );
nodeInDoc.setAttribute( attr, el.getAttribute( attr ) );
Eif ( nodeInDoc[ attr ] ) {
el.setAttribute( attr, nodeInDoc[ attr ] );
}
}
for ( var i = 0, iLen = elements.length; i < iLen; i++ ) {
var element = elements[ i ];
for ( var j = 0, jLen = attrs.length; j < jLen; j++ ) {
attr = attrs[ j ];
if ( element.hasAttribute( attr ) ) {
resolveAttribute( element );
}
Array.prototype.forEach.call( element.querySelectorAll( '[' + attr + ']' ), resolveAttribute );
}
}
};
/**
* Make all links within a DOM element open in a new window
*
* @param {HTMLElement} container DOM element to search for links
*/
ve.targetLinksToNewWindow = function ( container ) {
// Make all links open in a new window
Array.prototype.forEach.call( container.querySelectorAll( 'a[href]' ), function ( el ) {
ve.appendToRel( el, 'noopener' );
el.setAttribute( 'target', '_blank' );
} );
};
/**
* Add a value to an element's rel attribute if it's not already present
*
* Rel is like class: it's actually a set, represented as a string. We don't
* want to add the same value to the attribute if this function is called
* repeatedly. This is mostly a placeholder for the relList property someday
* becoming widely supported.
*
* @param {HTMLElement} element DOM element whose attribute should be checked
* @param {string} value New rel value to be added
*/
ve.appendToRel = function ( element, value ) {
var rel = element.getAttribute( 'rel' );
if ( !rel ) {
// Avoid all that string-creation if it's not needed
element.setAttribute( 'rel', value );
} else if ( ( ' ' + rel + ' ' ).indexOf( ' ' + value + ' ' ) === -1 ) {
element.setAttribute( 'rel', rel + ' ' + value );
}
};
/**
* Check if a string is a valid URI component.
*
* A URI component is considered invalid if decodeURIComponent() throws an exception.
*
* @param {string} s String to test
* @return {boolean} decodeURIComponent( s ) did not throw an exception
* @see #safeDecodeURIComponent
*/
ve.isUriComponentValid = function ( s ) {
try {
decodeURIComponent( s );
} catch ( e ) {
return false;
}
return true;
};
/**
* Safe version of decodeURIComponent() that doesn't throw exceptions.
*
* If the native decodeURIComponent() call threw an exception, the original string
* will be returned.
*
* @param {string} s String to decode
* @return {string} Decoded string, or same string if decoding failed
* @see #isUriComponentValid
*/
ve.safeDecodeURIComponent = function ( s ) {
try {
s = decodeURIComponent( s );
} catch ( e ) {}
return s;
};
/**
* Find the length of the common start sequence of one or more sequences
*
* Items are tested for sameness using === .
*
* @param {Array} sequences Array of sequences (arrays, strings etc)
* @return {number} Common start sequence length (0 if sequences is empty)
*/
ve.getCommonStartSequenceLength = function ( sequences ) {
if ( sequences.length === 0 ) {
return 0;
}
var commonLength = 0;
commonLengthLoop:
while ( true ) {
if ( commonLength >= sequences[ 0 ].length ) {
break;
}
var val = sequences[ 0 ][ commonLength ];
for ( var i = 1, len = sequences.length; i < len; i++ ) {
if (
sequences[ i ].length <= commonLength ||
sequences[ i ][ commonLength ] !== val
) {
break commonLengthLoop;
}
}
commonLength++;
}
return commonLength;
};
/**
* Find the nearest common ancestor of DOM nodes
*
* @param {...Node|null} DOM nodes
* @return {Node|null} Nearest common ancestor; or null if there is none / an argument is null
*/
ve.getCommonAncestor = function () {
var args = Array.prototype.slice.call( arguments );
var nodeCount = args.length;
if ( nodeCount === 0 ) {
return null;
}
var minHeight = null;
var chains = [];
var i, node;
// Build every chain
for ( i = 0; i < nodeCount; i++ ) {
var chain = [];
node = args[ i ];
while ( node !== null ) {
chain.unshift( node );
node = node.parentNode;
}
if ( chain.length === 0 ) {
// args[ i ] was null (so no common ancestor)
return null;
}
if ( i > 0 && chain[ 0 ] !== chains[ chains.length - 1 ][ 0 ] ) {
// No common ancestor (different documents or unattached branches)
return null;
}
if ( minHeight === null || minHeight > chain.length ) {
minHeight = chain.length;
}
chains.push( chain );
}
// Step through chains in parallel, until they differ.
// All chains are guaranteed to start with the common document element (or the common root
// of an unattached branch)
for ( i = 1; i < minHeight; i++ ) {
node = chains[ 0 ][ i ];
for ( var j = 1; j < nodeCount; j++ ) {
if ( node !== chains[ j ][ i ] ) {
return chains[ 0 ][ i - 1 ];
}
}
}
return chains[ 0 ][ minHeight - 1 ];
};
/**
* Get the index of a node in its parentNode's childNode list
*
* @param {Node} node The node
* @return {number} Index in parentNode's childNode list
*/
ve.parentIndex = function ( node ) {
return Array.prototype.indexOf.call( node.parentNode.childNodes, node );
};
/**
* Get the offset path from ancestor to offset in descendant
*
* @param {Node} ancestor The ancestor node
* @param {Node} node The descendant node
* @param {number} nodeOffset The offset in the descendant node
* @return {number[]} The offset path
*/
ve.getOffsetPath = function ( ancestor, node, nodeOffset ) {
var path = [ nodeOffset ];
while ( node !== ancestor ) {
Iif ( node.parentNode === null ) {
ve.log( node, 'is not a descendant of', ancestor );
throw new Error( 'Not a descendant' );
}
path.unshift( ve.parentIndex( node ) );
node = node.parentNode;
}
return path;
};
/**
* Compare two tuples in lexicographical order.
*
* This function first compares `a[0]` with `b[0]`, then `a[1]` with `b[1]`, etc.
* until it encounters a pair where `a[k] != b[k]`; then returns `a[k] - b[k]`.
*
* If `a[k] == b[k]` for every `k`, this function returns 0.
*
* If a and b are of unequal length, but `a[k] == b[k]` for all `k` that exist in both a and b, then
* this function returns `Infinity` (if a is longer) or `-Infinity` (if b is longer).
*
* @param {number[]} a First tuple
* @param {number[]} b Second tuple
* @return {number} `a[k] - b[k]` where k is the lowest k such that `a[k] != b[k]`
*/
ve.compareTuples = function ( a, b ) {
for ( var i = 0, len = Math.min( a.length, b.length ); i < len; i++ ) {
if ( a[ i ] !== b[ i ] ) {
return a[ i ] - b[ i ];
}
}
Iif ( a.length > b.length ) {
return Infinity;
}
if ( a.length < b.length ) {
return -Infinity;
}
return 0;
};
/**
* Compare two nodes for position in document
*
* Return null if either position is either null or incomparable (e.g. where one of the nodes
* is detached or the nodes are from different documents).
*
* @param {Node|null} node1 First node
* @param {number|null} offset1 First offset
* @param {Node|null} node2 Second node
* @param {number|null} offset2 Second offset
* @return {number|null} negative, zero or positive number, or null if nodes null or incomparable
*/
ve.compareDocumentOrder = function ( node1, offset1, node2, offset2 ) {
var commonAncestor = ve.getCommonAncestor( node1, node2 );
if ( commonAncestor === null ) {
// Signal no common ancestor. In theory we could disallow this case, and check
// the nodes for detachedness and same-documentness before each call, but such
// guard checks would duplicate (either explicitly or implicitly) much of the
// branch traversal performed in this method.
return null;
}
return ve.compareTuples(
ve.getOffsetPath( commonAncestor, node1, offset1 ),
ve.getOffsetPath( commonAncestor, node2, offset2 )
);
};
/**
* Get the closest matching DOM position in document order (forward or reverse)
*
* A DOM position is represented as an object with "node" and "offset" properties.
*
* The noDescend option can be used to exclude the positions inside certain element nodes; it is
* a jQuery selector/function ( used as a test by $node.is() - see http://api.jquery.com/is/ );
* it defaults to ve.rejectsCursor . Void elements (those matching ve.isVoidElement) are always
* excluded.
*
* As well as the end position, an array of ve.PositionSteps (node traversals) is returned.
* The "stop" option is a boolean-valued function used to test each ve.PositionStep in turn. If
* If it returns true, the position arrived at is returned; else the stepping continues to the
* next matching DOM position. It defaults to ve.isHardCursorStep .
*
* Limitation: some DOM positions cannot actually hold the cursor; e.g. the start of the interior
* of a table node. Browser cursoring jumps over text node/annotation node boundaries as if they
* were invisible, and skips over most grapheme clusters e.g. 'x\u0301' (though not all e.g.
* '\u062D\u0627'). Also, Chromium normalizes cursor focus/offset, when they are set, to the
* start-most such cursor position (Firefox does not).
*
* @param {Object} position Start position
* @param {Node} position.node Start node
* @param {number} position.offset Start offset
* @param {number} direction +1 for forward, -1 for reverse
* @param {Object} options
* @param {Function|string} [options.noDescend] Selector or function: nodes to skip over
* @param {Function} [options.stop] Boolean-valued ve.PositionStep test function
* @return {Object} The adjacent DOM position encountered
* @return {Node|null} return.node The node, or null if we stepped past the root node
* @return {number|null} return.offset The offset, or null if we stepped past the root node
* @return {Object[]} return.steps Steps taken {node: x, type: leave|cross|enter|internal, offset: n}
* @see ve#isHardCursorStep
*/
ve.adjacentDomPosition = function ( position, direction, options ) {
var node = position.node,
offset = position.offset,
steps = [];
var noDescend = options.noDescend || ve.rejectsCursor;
var stop = options.stop || ve.isHardCursorStep;
direction = direction < 0 ? -1 : 1;
var forward = ( direction === 1 );
while ( true ) {
var step;
// If we're at the node's leading edge, move to the adjacent position in the parent node
if ( offset === ( forward ? node.length || node.childNodes.length : 0 ) ) {
step = new ve.PositionStep( node, 'leave' );
steps.push( step );
if ( node.parentNode === null ) {
return {
node: null,
offset: null,
steps: steps
};
}
offset = ve.parentIndex( node ) + ( forward ? 1 : 0 );
node = node.parentNode;
if ( stop( step ) ) {
return {
node: node,
offset: offset,
steps: steps
};
}
// Else take another step
continue;
}
// Else we're in the interior of a node
// If we're in a text node, move to the position in this node at the next offset
if ( node.nodeType === Node.TEXT_NODE ) {
step = new ve.PositionStep(
node,
'internal',
offset - ( forward ? 0 : 1 )
);
steps.push( step );
offset += direction;
Eif ( stop( step ) ) {
return {
node: node,
offset: offset,
steps: steps
};
}
continue;
}
// Else we're in the interior of an element node
var childNode = node.childNodes[ forward ? offset : offset - 1 ];
// Support: Firefox
// If the child is uncursorable, or is an element matching noDescend, do not
// descend into it: instead, return the position just beyond it in the current node
if (
childNode.nodeType === Node.ELEMENT_NODE &&
( ve.isVoidElement( childNode ) || $( childNode ).is( noDescend ) )
) {
step = new ve.PositionStep( childNode, 'cross' );
steps.push( step );
offset += forward ? 1 : -1;
if ( stop( step ) ) {
return {
node: node,
offset: offset,
steps: steps
};
}
// Else take another step
continue;
}
// Go to the closest offset inside the child node
node = childNode;
offset = forward ? 0 : node.length || node.childNodes.length;
step = new ve.PositionStep( node, 'enter' );
steps.push( step );
if ( stop( step ) ) {
return {
node: node,
offset: offset,
steps: steps
};
}
}
};
/**
* Test whether a cursor movement step uses up a cursor press
*
* Essentially, this is true unless entering/exiting a contentEditable text/annotation node.
* For instance in <#text>X</#text><b><#text>y</#text></b>
* a single cursor press will jump from just after X to just after Y.
*
* @param {ve.PositionStep} step The cursor movement step to test
* @return {boolean} Whether the cursor movement step uses up a cursor press
* @see ve#adjacentDomPosition
*/
ve.isHardCursorStep = function ( step ) {
if ( step.node.nodeType === Node.TEXT_NODE ) {
return step.type === 'internal';
}
return ve.isBlockElement( step.node ) || ve.rejectsCursor( step.node );
};
/**
* Tests whether an adjacent cursor would be prevented from entering the node
*
* @param {Node} [node] Element node or text node; defaults to "this" if a Node
* @return {boolean} Whether an adjacent cursor would be prevented from entering
*/
ve.rejectsCursor = function ( node ) {
if ( !node && this instanceof Node ) {
node = this;
}
Iif ( node.nodeType === node.TEXT_NODE ) {
return false;
}
if ( ve.isVoidElement( node ) ) {
return true;
}
// We don't need to check whether the ancestor-nearest contenteditable tag is
// false, because if so then there can be no adjacent cursor.
return node.contentEditable === 'false';
};
/**
* Count the common elements at the start and end of two sequences
*
* @param {Array|string} before The original sequence
* @param {Array|string} after The modified sequence
* @param {Function} [equals] Two-argument comparison returning boolean (defaults to ===)
* @return {Object|null} Change offsets (valid in both sequences), or null if unchanged
* @return {number} return.start Offset from start of first changed element
* @return {number} return.end Offset from end of last changed element (nonoverlapping with start)
*/
ve.countEdgeMatches = function ( before, after, equals ) {
Iif ( !equals ) {
equals = function ( x, y ) {
return x === y;
};
}
var start, end;
var len = Math.min( before.length, after.length );
// Find maximal matching left slice
for ( start = 0; start < len; start++ ) {
if ( !equals( before[ start ], after[ start ] ) ) {
break;
}
}
if ( start === len && before.length === after.length ) {
return null;
}
// Find maximal matching right slice that doesn't overlap the left slice
for ( end = 0; end < len - start; end++ ) {
if ( !equals(
before[ before.length - 1 - end ],
after[ after.length - 1 - end ]
) ) {
break;
}
}
return { start: start, end: end };
};
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