mediawiki-extensions-Visual.../modules/ve2/ve.js
Trevor Parscal e0de881a8a Removed trailing whitespace in multi-line comment blocks
JSHint and various git tools complain about this, so let's just do away with them altogether

Change-Id: I731866bd21f1ee0088fb0a71df3abf92692aca23
2012-05-14 15:05:09 -07:00

275 lines
7.5 KiB
JavaScript

/**
* VisualEditor namespace.
*
* All classes and functions will be attached to this object to keep the global namespace clean.
*/
window.ve = {
/**
* List of instances of visual editors
*/
'instances': []
};
/* Functions */
/**
* Extends a constructor with the prototype of another.
*
* When using this, it's required to include a call to the constructor of the parent class as the
* first code in the child class's constructor.
*
* @example
* // Define parent class
* function Foo() {
* // code here
* }
* // Define child class
* function Bar() {
* // Call parent constructor
* Foo.call( this );
* }
* // Extend prototype
* ve.extendClass( Bar, Foo );
*
* @static
* @method
* @param {Function} dst Class to extend
* @param {Function} src Base class to use methods from
*/
ve.extendClass = function( dst, src ) {
var base = src.prototype;
for ( var method in base ) {
if ( typeof base[method] === 'function' && !( method in dst.prototype ) ) {
dst.prototype[method] = base[method];
}
}
};
ve.extendObject = $.extend;
ve.isPlainObject = $.isPlainObject;
ve.isEmptyObject = $.isEmptyObject;
ve.isArray = $.isArray;
/**
* Wrapper for Array.prototype.indexOf
*
* @param {Mixed} value Element to search for
* @param {Array} array Array to search in
* @param {Integer} [fromIndex=0] Index to being searching from
* @return {Number} Index of value in array, or -1 if not found. Comparisons are done with ===
*/
ve.inArray = $.inArray;
/**
* Generates a hash of an object based on it's name and data.
*
* This is actually an alias for jQuery.json, which falls back to window.JSON if present.
*
* @static
* @method
* @param {Object} obj Object to generate hash for
* @returns {String} Hash of object
*/
ve.getHash = $.toJson;
/**
* Gets an array of all property names in an object.
*
* This falls back to the native impelentation of Object.keys if available.
*
* @static
* @method
* @param {Object} Object to get properties from
* @returns {String[]} List of object keys
*/
ve.getObjectKeys = Object.keys || function( obj ) {
var keys = [],
key,
hop = Object.prototype.hasOwnProperty;
for ( key in obj ) {
if ( hop.call( obj, key ) ) {
keys.push( key );
}
}
return keys;
};
/**
* Gets an array of all property values in an object.
*
* @static
* @method
* @param {Object} Object to get values from
* @returns {Array} List of object values
*/
ve.getObjectValues = function( obj ) {
var values = [],
key,
hop = Object.prototype.hasOwnProperty;
for ( key in obj ) {
if ( hop.call( obj, key ) ) {
values.push( obj[key] );
}
}
return values;
};
/**
* Recursively compares string and number property 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.
*
* @static
* @method
* @param {Object} a First object to compare
* @param {Object} b Second object to compare
* @param {Boolean} [asymmetrical] Whether to check only that b contains values from a
* @returns {Boolean} If the objects contain the same values as each other
*/
ve.compareObjects = function( a, b, asymmetrical ) {
var aValue, bValue, aType, bType;
var k;
for ( k in a ) {
aValue = a[k];
bValue = b[k];
aType = typeof aValue;
bType = typeof bValue;
if ( aType !== bType ||
( ( aType === 'string' || aType === 'number' ) && aValue !== bValue ) ||
( ve.isPlainObject( aValue ) && !ve.compareObjects( aValue, bValue ) ) ) {
return false;
}
}
// If the check is not asymmetrical, recursing with the arguments swapped will verify our result
return asymmetrical ? true : ve.compareObjects( b, a, true );
};
/**
* Recursively compare two arrays.
*
* @static
* @method
* @param {Array} a First array to compare
* @param {Array} b Second array to compare
* @param {Boolean} [compareObjects] If true, use ve.compareObjects() to compare objects, otherwise use ===
*/
ve.compareArrays = function( a, b, compareObjects ) {
var i, aValue, bValue, aType, bType;
if ( a.length !== b.length ) {
return false;
}
for ( i = 0; i < a.length; i++ ) {
aValue = a[i];
bValue = b[i];
aType = typeof aValue;
bType = typeof bValue;
if ( aType !== bType || !(
( ve.isArray( aValue ) && ve.isArray( bValue ) && ve.compareArrays( aValue, bValue ) ) ||
( compareObjects && ve.isPlainObject( aValue ) && ve.compareObjects( aValue, bValue ) ) ||
aValue === bValue
) ) {
return false;
}
}
return true;
};
/**
* Gets a deep copy of an array's string, number, array and plain-object contents.
*
* @static
* @method
* @param {Array} source Array to copy
* @returns {Array} Copy of source array
*/
ve.copyArray = function( source ) {
var destination = [];
for ( var i = 0; i < source.length; i++ ) {
var sourceValue = source[i],
sourceType = typeof sourceValue;
if ( sourceType === 'string' || sourceType === 'number' ) {
destination.push( sourceValue );
} else if ( ve.isPlainObject( sourceValue ) ) {
destination.push( ve.copyObject( sourceValue ) );
} else if ( ve.isArray( sourceValue ) ) {
destination.push( ve.copyArray( sourceValue ) );
}
}
return destination;
};
/**
* Gets a deep copy of an object's string, number, array and plain-object properties.
*
* @static
* @method
* @param {Object} source Object to copy
* @returns {Object} Copy of source object
*/
ve.copyObject = function( source ) {
var destination = {};
for ( var key in source ) {
var sourceValue = source[key],
sourceType = typeof sourceValue;
if ( sourceType === 'string' || sourceType === 'number' ) {
destination[key] = sourceValue;
} else if ( ve.isPlainObject( sourceValue ) ) {
destination[key] = ve.copyObject( sourceValue );
} else if ( ve.isArray( sourceValue ) ) {
destination[key] = ve.copyArray( sourceValue );
}
}
return destination;
};
/**
* Splice one array into another. This is the equivalent of arr.splice( offset, remove, d1, d2, d3, ... )
* except that d1, d2, d3, ... are specified as an array rather than separate parameters.
*
* @static
* @method
* @param {Array} arr Array to remove from and insert into. Will be modified
* @param {Number} offset Offset in arr to splice at. May be negative; see the 'index'
* parameter for Array.prototype.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
*/
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;
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
arr.splice( offset, remove );
return;
}
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
arr.splice.apply(
arr, [index + offset, toRemove].concat( data.slice( index, index + batchSize ) )
);
index += batchSize;
toRemove = 0;
}
};
/**
* Insert one array into another. This just calls ve.batchSplice( dst, offset, 0, src )
*
* @static
* @method
* @see ve.batchSplice
*/
ve.insertIntoArray = function( dst, offset, src ) {
ve.batchSplice( dst, offset, 0, src );
};