Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isFunction = require( '@stdlib/assert/is-function' );
var isStructDataType = require( '@stdlib/ndarray/base/assert/is-struct-data-type' );
var resolveStr = require( '@stdlib/ndarray/base/dtype-resolve-str' );
var structFactory = require( '@stdlib/array/struct-factory' );
var table = require( './ctors.js' );
// VARIABLES //
// Initialize a cache to storing memoized struct array constructors:
var CACHE = {}; // TODO: consider adding/using `@stdlib/array/memoized-struct-factory`; should we need to memoize struct array constructors elsewhere, we should centralize that logic, rather than have multiple caches.
// MAIN //
/**
* Returns an ndarray data buffer constructor.
*
* @param {*} dtype - data type
* @returns {(Function|null)} data buffer constructor or null
*
* @example
* var ctor = ctors( 'float64' );
* // returns <Function>
*
* @example
* var ctor = ctors( 'float' );
* // returns null
*/
function ctors( dtype ) {
var struct;
var ctor;
var key;
// Case: string || dtype_instance_with_string
if ( !isFunction( dtype ) ) {
key = resolveStr( dtype );
ctor = table[ key ] || null;
if ( ctor ) {
return ctor;
}
}
// Case: struct_ctor || dtype_instance_with_struct_ctor
if ( isStructDataType( dtype ) ) {
if ( key ) {
// Data type instance (note: we assume that `key === struct.layout`):
struct = dtype.value;
} else {
// Struct constructor:
struct = dtype;
key = struct.layout;
}
ctor = CACHE[ key ];
if ( ctor ) {
return ctor;
}
ctor = structFactory( struct );
CACHE[ key ] = ctor;
return ctor;
}
return null;
}
// EXPORTS //
module.exports = ctors;
|