mediawiki-extensions-Visual.../modules/ve/dm/ve.dm.Model.js
Timo Tijhof 08610a4ecb doc: Clean up spacing that caused <pre> or broken <ul>/<ol>
Whenever there is more than 2 spaces (except the extra space
on a continued line of an @ tag, or the extra space on a
continued line of a list item) it causes a <pre> context.

Removed both spurious spaces that caused a <pre> and ones that
didn't but looked like it could.

When making an ordered or unordered list, the first item needs
to be on a new line and in block context (e.g. an empty line
before it). Otherwise it is rendered inline as 1. Foo 2. Bar
(such as in #rebuildNodes where both the ordered and unordered
lists were broken).

Change-Id: Id0f154854afbdc8e5a8387da92e6b2cdf0875f69
2013-07-25 04:02:50 +02:00

391 lines
14 KiB
JavaScript

/*!
* VisualEditor DataModel Model class.
*
* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* Base class for DM models.
*
* @class
* @abstract
*
* @constructor
* @param {Object} element Reference to plain object in linear model
*/
ve.dm.Model = function VeDmModel( element ) {
// Properties
this.element = element || { 'type': this.constructor.static.name };
};
/* Static Properties */
/**
* @static
* @property
* @inheritable
*/
ve.dm.Model.static = {};
/**
* Symbolic name for this model class. Must be set to a unique string by every subclass.
* @static
* @property {string} [static.name=null]
* @inheritable
*/
ve.dm.Model.static.name = null;
/**
* Array of HTML tag names that this model should be a match candidate for.
* Empty array means none, null means any.
* For more information about element matching, see ve.dm.ModelRegistry.
* @static
* @property {string[]} static.matchTagNames
* @inheritable
*/
ve.dm.Model.static.matchTagNames = null;
/**
* Array of RDFa types that this model should be a match candidate for.
* Empty array means none, null means any.
* For more information about element matching, see ve.dm.ModelRegistry.
* @static
* @property {Array} static.matchRdfaType Array of strings or regular expressions
* @inheritable
*/
ve.dm.Model.static.matchRdfaTypes = null;
/**
* Optional function to determine whether this model should match a given element.
* Takes an HTMLElement and returns true or false.
* This function is only called if this model has a chance of "winning"; see
* ve.dm.ModelRegistry for more information about element matching.
* If set to null, this property is ignored. Setting this to null is not the same as unconditionally
* returning true, because the presence or absence of a matchFunction affects the model's
* specificity.
*
* NOTE: This function is NOT a method, within this function "this" will not refer to an instance
* of this class (or to anything reasonable, for that matter).
* @static
* @property {Function} static.matchFunction
* @inheritable
*/
ve.dm.Model.static.matchFunction = null;
/**
* Static function to convert a DOM element or set of sibling DOM elements to a linear model element
* for this model type.
*
* This function is only called if this model "won" the matching for the first DOM element, so
* domElements[0] will match this model's matching rule. There is usually only one DOM node in
* domElements[]. Multiple elements will only be passed if this model supports about groups.
* If there are multiple nodes, the nodes are all adjacent siblings in the same about group
* (i.e. they are grouped together because they have the same value for the about attribute).
*
* The converter has some state variables that can be obtained by this function:
* - if converter.isExpectingContent() returns true, the converter expects a content element
* - if converter.isInWrapper() returns true, the returned element will be put in a wrapper
* paragraph generated by the converter (this is only relevant if isExpectingContent() is true)
* - converter.canCloseWrapper() returns true if the current wrapper paragraph can be closed,
* and false if it can't be closed or if there is no active wrapper
*
* This function is allowed to return a content element when context indicates that a non-content
* element is expected or vice versa. If that happens, the converter deals with it in the following way:
*
* - if a non-content element is expected but a content element is returned:
* - open a wrapper paragraph
* - put the returned element in the wrapper
* - if a content element is expected but a non-content element is returned:
* - if we are in a wrapper paragraph:
* - if we can close the wrapper:
* - close the wrapper
* - insert the returned element right after the end of the wrapper
* - if we can't close the wrapper:
* - alienate the element
* - if we aren't in a wrapper paragraph:
* - alienate the element
*
* For these purposes, annotations are considered content. Meta-items can occur anywhere, so if
* a meta-element is returned no special action is taken. Note that "alienate" always means an alien
* *node* (ve.dm.AlienNode) will be generated, never an alien meta-item (ve.dm.AlienMetaItem),
* regardless of whether the subclass attempting the conversion is a node or a meta-item.
*
* The returned linear model element must have a type property set to a registered model name
* (usually the model's own .static.name, but that's not required). It may optionally have an attributes
* property set to an object with key-value pairs. Any other properties are not allowed.
*
* This function may return a single linear model element, or an array of balanced linear model
* data. If this function needs to recursively convert a DOM node (e.g. a child of one of the
* DOM elements passed in), it can call converter.getDataFromDomRecursion( domElement ). Note that
* if an array is returned, the converter will not descend into the DOM node's children; the model
* will be assumed to have handled those children.
*
* @static
* @inheritable
* @method
* @param {HTMLElement[]} domElements DOM elements to convert. Usually only one element
* @param {ve.dm.Converter} converter Converter object
* @returns {Object|Array|null} Linear model element, or array with linear model data, or null to alienate
*/
ve.dm.Model.static.toDataElement = function ( /*domElements, converter*/ ) {
throw new Error( 've.dm.Model subclass must implement toDataElement' );
};
/**
* Static function to convert a linear model data element for this model type back to one or more
* DOM elements.
*
* If this model is a node with .handlesOwnChildren set to true, dataElement will be an array of
* the linear model data of this node and all of its children, rather than a single element.
* In this case, this function way want to recursively convert linear model data to DOM, which can
* be done with converter#getDomSubtreeFromData.
*
* NOTE: If this function returns multiple DOM elements, the DOM elements produced by the children
* of this model (if it's a node and has children) will be attached to the first DOM element in the array.
* For annotations, only the first element is used, and any additional elements are ignored.
*
* @static
* @inheritable
* @method
* @param {Object|Array} dataElement Linear model element or array of linear model data
* @param {HTMLDocument} doc HTML document for creating elements
* @param {ve.dm.Converter} converter Converter object to optionally call .getDomSubtreeFromData() on
* @returns {HTMLElement[]} DOM elements
*/
ve.dm.Model.static.toDomElements = function ( /*dataElement, doc, converter*/ ) {
throw new Error( 've.dm.Model subclass must implement toDomElements' );
};
/**
* Whether this model supports about grouping. When a DOM element matches a model type that has
* about grouping enabled, the converter will look for adjacent siblings with the same value for
* the about attribute, and ask toDataElement() to produce a single data element for all of those
* DOM nodes combined.
*
* The converter doesn't descend into about groups, i.e. it doesn't convert the children of the
* DOM elements that make up the about group. This means the resulting linear model element will
* be childless.
*
* @static
* @property {boolean} static.enableAboutGrouping
* @inheritable
*/
ve.dm.Model.static.enableAboutGrouping = false;
/**
* Which HTML attributes should be preserved for this model type. HTML attributes on the DOM
* elements that match this specification will be stored as attributes in the linear model. The
* attributes will be stored in the .htmlAttributes property of the linear model element.
*
* When converting back to DOM, these HTML attributes will be restored except for attributes that
* were already set by toDomElements().
*
* The value of this property can be one of the following:
*
* - true, to preserve all attributes (default)
* - false, to preserve none
* - a string, to preserve only that attribute
* - a regular expression matching attributes that should be preserved
* - an array of strings or regular expressions
* - an object with the following keys:
* - 'blacklist': specification of attributes not to preserve (boolean|string|RegExp|Array)
* - 'whitelist': specification of attributes to preserve
*
* If only a blacklist is specified, all attributes will be preserved except the ones matching
* the blacklist. If only a whitelist is specified, only those attributes matching the whitelist
* will be preserved. If both are specified, only attributes that both match the whitelist and
* do not match the blacklist will be preserved.
*
* @static
* @property {boolean|string|RegExp|Array|Object} static.storeHtmlAttributes
* @inheritable
*/
ve.dm.Model.static.storeHtmlAttributes = true;
/* Static methods */
/**
* Determine whether an attribute name matches an attribute specification.
*
* @param {string} attribute Attribute name
* @param {boolean|string|RegExp|Array|Object} spec Attribute specification, see ve.dm.Model.static.storeHtmlAttributes
* @returns {boolean} Attribute matches spec
*/
ve.dm.Model.matchesAttributeSpec = function ( attribute, spec ) {
function matches( subspec ) {
if ( subspec instanceof RegExp ) {
return !!subspec.exec( attribute );
}
if ( typeof subspec === 'boolean' ) {
return subspec;
}
return attribute === subspec;
}
function matchesArray( specArray ) {
var i, len;
if ( !ve.isArray( specArray ) ) {
specArray = [ specArray ];
}
for ( i = 0, len = specArray.length; i < len; i++ ) {
if ( matches( specArray[i] ) ) {
return true;
}
}
return false;
}
if ( spec.whitelist === undefined && spec.blacklist === undefined ) {
// Not an object, treat spec as a whitelist
return matchesArray( spec );
}
return matchesArray( spec.whitelist || true ) && !matchesArray( spec.blacklist || false );
};
/**
* Get hash object of a linear model data element
*
* @static
* @param {Object} dataElement Data element
* @returns {Object} Hash object
*/
ve.dm.Model.static.getHashObject = function ( dataElement ) {
return {
type: dataElement.type,
attributes: dataElement.attributes,
htmlAttributes: dataElement.htmlAttributes
};
};
/* Methods */
/**
* Get a reference to the linear model element
*
* @method
* @returns {Object} Linear model element passed to the constructor, by reference
*/
ve.dm.Model.prototype.getElement = function () {
return this.element;
};
/**
* Get the symbolic name of this model's type
*
* @method
* @returns {string} Type name
*/
ve.dm.Model.prototype.getType = function () {
return this.constructor.static.name;
};
/**
* Get the value of an attribute.
*
* Return value is by reference if array or object.
*
* @method
* @param {string} key Name of attribute to get
* @returns {Mixed} Value of attribute, or undefined if no such attribute exists
*/
ve.dm.Model.prototype.getAttribute = function ( key ) {
return this.element && this.element.attributes ? this.element.attributes[key] : undefined;
};
/**
* Get a copy of all attributes.
*
* Values are by reference if array or object, similar to using the getAttribute method.
*
* @method
* @param {string} prefix Only return attributes with this prefix, and remove the prefix from them
* @returns {Object} Attributes
*/
ve.dm.Model.prototype.getAttributes = function ( prefix ) {
var key, filtered,
attributes = this.element && this.element.attributes ? this.element.attributes : {};
if ( prefix ) {
filtered = {};
for ( key in attributes ) {
if ( key.indexOf( prefix ) === 0 ) {
filtered[key.substr( prefix.length )] = attributes[key];
}
}
return filtered;
}
return ve.extendObject( {}, attributes );
};
/**
* Get the preserved HTML attributes.
* @returns {Object[]} HTML attribute list, or empty array
*/
ve.dm.Model.prototype.getHtmlAttributes = function () {
return ( this.element && this.element.htmlAttributes ) || [];
};
/**
* Check if the model has certain attributes.
*
* If an array of keys is provided only the presence of the attributes will be checked. If an object
* with keys and values is provided both the presence of the attributes and their values will be
* checked. Comparison of values is done by casting to strings unless the strict argument is used.
*
* @method
* @param {string[]|Object} attributes Array of keys or object of keys and values
* @param {boolean} strict Use strict comparison when checking if values match
* @returns {boolean} Model has attributes
*/
ve.dm.Model.prototype.hasAttributes = function ( attributes, strict ) {
var key, i, len,
ourAttributes = this.getAttributes() || {};
if ( ve.isPlainObject( attributes ) ) {
// Node must have all the required attributes
for ( key in attributes ) {
if (
!( key in ourAttributes ) ||
( strict ?
attributes[key] !== ourAttributes[key] :
String( attributes[key] ) !== String( ourAttributes[key] )
)
) {
return false;
}
}
} else if ( ve.isArray( attributes ) ) {
for ( i = 0, len = attributes.length; i < len; i++ ) {
if ( !( attributes[i] in ourAttributes ) ) {
return false;
}
}
}
return true;
};
/**
* Get a clone of the model's linear model element.
*
* The attributes object will be deep-copied.
*
* @returns {Object} Cloned element object
*/
ve.dm.Model.prototype.getClonedElement = function () {
return ve.copyObject( this.element );
};
/**
* Get the hash object of the linear model element.
*
* The actual logic is in a static function as this needs
* to be accessible from ve.dm.Converter
*
* This is a custom hash function for ve#getHash.
*
* @method
* @returns {Object} Hash object
*/
ve.dm.Model.prototype.getHashObject = function () {
return this.constructor.static.getHashObject( this.element );
};