mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-09-27 20:26:46 +00:00
2cee2adb6d
* Added support for asking if a given node type can have children or grandchildren and what types of nodes can be it's parent or child * Removed canHaveChildren methods from leaf and branch nodes and converted use of them to depend on factory to read static rules from constructor lookup by type Change-Id: I9769f95647066576416bacb791c4b68dd0285b35
52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
/**
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* Generic node factory.
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*
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* @class
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* @constructor
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*/
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ve.NodeFactory = function() {
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this.registry = [];
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};
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/* Methods */
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/**
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* Register a node type with the factory.
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*
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* Arguments will be passed through directly to the constructor.
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* @see {ve.NodeFactory.prototype.createNode}
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*
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* @param {String} type Node type
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* @param {Function} constructor Node constructor subclassing ve.Node
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* @throws 'Constructor must be a function, cannot be a string'
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*/
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ve.NodeFactory.prototype.register = function( type, constructor ) {
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if ( typeof constructor !== 'function' ) {
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throw 'Constructor must be a function, cannot be a ' + typeof constructor;
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}
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this.registry[type] = constructor;
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};
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/**
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* Create a node based on a type.
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*
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* Type is used to look up the constructor to use, while all additional arguments are passed to the
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* constructor directly, so leaving one out will pass an undefined to the constructor.
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*
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* WARNING: JavaScript does not allow using new and .apply together, so we just pass through 2
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* arguments here since we know we only need that many at this time. If we need more in the future
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* we should change this to suit that use case. Because of undefined pass through, there's no harm
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* in adding more.
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*
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* @param {String} type Node type
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* @param {Mixed} [...] Up to 2 additional arguments to pass through to the constructor
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* @returns {ve.Node} The new node object
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* @throws 'Unknown node type'
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*/
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ve.NodeFactory.prototype.createNode = function( type, a, b ) {
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if ( type in this.registry ) {
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return new this.registry[type]( a, b );
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}
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throw 'Unknown node type: ' + type;
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};
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