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* VisualEditor LinearData class.
*
* Class containing linear data and an hash-value store.
*
* @copyright See AUTHORS.txt
*/
/**
* Generic linear data storage
*
* @class
* @constructor
* @param {ve.dm.HashValueStore} store Hash-value store
* @param {Array} [data] Linear data
*/
ve.dm.LinearData = function VeDmLinearData( store, data ) {
this.store = store;
this.data = data ? ve.deepFreeze( data, true ) : [];
};
/* Inheritance */
OO.initClass( ve.dm.LinearData );
/* Static Methods */
/**
* Get the type of an element
*
* This will return the same string for close and open elements.
*
* @param {Object} item Element item
* @return {string} Type of the element
*/
ve.dm.LinearData.static.getType = function ( item ) {
return this.isCloseElementData( item ) ? item.type.slice( 1 ) : item.type;
};
/**
* Check if data item is an element.
*
* This method assumes that any value that has a type property that's a string is an element object.
*
* Element data:
*
* <heading> a </heading> <paragraph> b c <img></img> </paragraph>
* ^ . ^ ^ . . ^ ^ ^ .
*
* @param {Object|Array|string} item Linear data item
* @return {boolean} Item is an element
*/
ve.dm.LinearData.static.isElementData = function ( item ) {
// Data exists and appears to be an element
return item !== undefined && typeof item.type === 'string';
};
/**
* Checks if data item is an open element.
*
* @param {Object} item Element item
* @return {boolean} Item is an open element
*/
ve.dm.LinearData.static.isOpenElementData = function ( item ) {
return this.isElementData( item ) && item.type.charAt( 0 ) !== '/';
};
/**
* Checks if data item is a close element.
*
* @param {Object} item Element item
* @return {boolean} Item is a close element
*/
ve.dm.LinearData.static.isCloseElementData = function ( item ) {
return this.isElementData( item ) && item.type.charAt( 0 ) === '/';
};
/* Methods */
/**
* Gets linear data from a specified index, or all data if no index specified
*
* @param {number} [offset] Offset to get data from
* @return {Object|Array} Data from index, or all data (by reference)
*/
ve.dm.LinearData.prototype.getData = function ( offset ) {
return offset === undefined ? this.data : this.data[ offset ];
};
/**
* Sets linear data at a specified index
*
* @param {number} offset Offset to set data at
* @param {Object|string} value Value to store
*/
ve.dm.LinearData.prototype.setData = function ( offset, value ) {
this.data[ offset ] = typeof value === 'object' ? ve.deepFreeze( value ) : value;
// this.data[ offset ] = value;
};
/**
* Modify an existing object in the linear model
*
* As objects in the model and immutable, this creates
* a clone which is passed to a callback function for
* modification, then the clone is inserted into the model.
*
* @param {number} offset Offset to modify data at
* @param {Function} modify Modification function. First argument is the data element to modify.
*/
ve.dm.LinearData.prototype.modifyData = function ( offset, modify ) {
// Unfreeze object by creating a new copy
var newItem = ve.copy( this.getData( offset ) );
// Modify via callback
modify( newItem );
// Insert into linear model, re-freezing it
this.setData( offset, newItem );
};
/**
* Push data to the end of the array
*
* @param {...Object} [value] Values to store
* @return {number} The new length of the linear data
*/
ve.dm.LinearData.prototype.push = function () {
return Array.prototype.push.apply( this.data, arguments );
};
/**
* Gets length of the linear data
*
* @return {number} Length of the linear data
*/
ve.dm.LinearData.prototype.getLength = function () {
return this.getData().length;
};
/**
* Gets the hash-value store
*
* @return {ve.dm.HashValueStore} The hash-value store
*/
ve.dm.LinearData.prototype.getStore = function () {
return this.store;
};
/**
* Slice linear data
*
* @param {number} begin Index to begin at
* @param {number} [end] Index to end at
* @return {Array} One-level deep copy of sliced range
*/
ve.dm.LinearData.prototype.slice = function () {
return Array.prototype.slice.apply( this.data, arguments );
};
/**
* Slice linear data and return new LinearData object containing result
*
* @param {number} begin Index to begin at
* @param {number} [end] Index to end at
* @return {ve.dm.LinearData} LinearData object containing one-level deep copy of sliced range
*/
ve.dm.LinearData.prototype.sliceObject = function () {
return new this.constructor( this.getStore(), this.slice.apply( this, arguments ) );
};
/**
* Splice linear data
*
* @param {number} index Splice from
* @param {number} howmany Items to be removed
* @param {...Object} [element] Items to be inserted
* @return {Array} Elements removed
*/
ve.dm.LinearData.prototype.splice = function () {
return Array.prototype.splice.apply( this.data, arguments );
};
/**
* Splice linear data and return new LinearData object containing result
*
* @param {number} index Splice from
* @param {number} howmany Items to be removed
* @param {...Object} [element] Items to be inserted
* @return {ve.dm.LinearData} LinearData object containing elements removed
*/
ve.dm.LinearData.prototype.spliceObject = function () {
return new this.constructor( this.getStore(), this.splice.apply( this, arguments ) );
};
/**
* Returns ve.batchSplice of linear data
*
* @see ve#batchSplice
* @param {number} offset
* @param {number} remove
* @param {Array} data
* @return {Array}
*/
ve.dm.LinearData.prototype.batchSplice = function ( offset, remove, data ) {
return ve.batchSplice( this.getData(), offset, remove, data );
};
/**
* Returns ve.batchSplice of linear data, wrapped in a LinearData object
*
* @see ve#batchSplice
* @param {number} offset
* @param {number} remove
* @param {Array} data
* @return {ve.dm.LinearData}
*/
ve.dm.LinearData.prototype.batchSpliceObject = function ( offset, remove, data ) {
return new this.constructor(
this.getStore(),
this.batchSplice( offset, remove, data )
);
};
/**
* Get a slice or copy of the provided data.
*
* @param {ve.Range} [range] Range of data to get, all data will be given by default
* @param {boolean} [deep=false] Whether to return a deep copy (WARNING! This may be very slow)
* @return {Array} Slice or copy of data
*/
ve.dm.LinearData.prototype.getDataSlice = function ( range, deep ) {
var end,
start = 0,
length = this.getLength();
if ( range !== undefined ) {
start = Math.max( 0, Math.min( length, range.start ) );
end = Math.max( 0, Math.min( length, range.end ) );
}
var data = this.slice( start, end );
// Return either the slice or a deep copy of the slice
return deep ? ve.copy( data ) : data;
};
/*
* Clone the data, with a deep copy of the data.
*
* @return {ve.dm.LinearData} Clone of this object
*/
ve.dm.LinearData.prototype.clone = function () {
return new this.constructor(
this.getStore(),
ve.copy( this.data )
);
};
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