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 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | 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 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 26x 26x 26x 26x 338x 338x 338x 26x 26x 2x 2x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 189x 189x 189x 2x 2x 187x 189x 175x 175x 175x 169x 169x 175x 18x 189x 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 objectKeys = require( '@stdlib/utils/keys' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var resolve = require( '@stdlib/strided/base/dtype-resolve-str' );
var PROMOTION_RULES = require( './promotion_rules.json' );
// FUNCTIONS //
/**
* Generates a full table of promotion rules.
*
* @private
* @returns {Object} table
*/
function generateFullTable() {
var dtypes;
var ntypes;
var out;
var tmp;
var dt1;
var dt2;
var o;
var j;
var i;
out = {};
dtypes = objectKeys( PROMOTION_RULES );
ntypes = dtypes.length;
for ( i = 0; i < ntypes; i++ ) {
dt1 = dtypes[ i ];
o = PROMOTION_RULES[ dt1 ];
tmp = {};
for ( j = 0; j < ntypes; j++ ) {
dt2 = dtypes[ j ];
tmp[ dt2 ] = o[ dt2 ];
}
out[ dt1 ] = tmp;
}
return out;
}
// MAIN //
/**
* Returns the array data type with the smallest size and closest "kind" to which array data types can be safely cast.
*
* @param {*} [dtype1] - array data type value
* @param {*} [dtype2] - array data type value
* @returns {(Object|integer|string|null)} promotion rule(s) or null
*
* @example
* var table = promotionRules();
* // returns {...}
*
* @example
* var dt = promotionRules( 'float32', 'uint32' );
* // returns 'float64'
*
* @example
* var dt = promotionRules( 'float32', 'foo' );
* // returns null
*/
function promotionRules( dtype1, dtype2 ) {
var o;
if ( arguments.length === 0 ) {
return generateFullTable();
}
dtype1 = resolve( dtype1 );
if ( hasOwnProp( PROMOTION_RULES, dtype1 ) ) {
o = PROMOTION_RULES[ dtype1 ];
dtype2 = resolve( dtype2 );
if ( hasOwnProp( o, dtype2 ) ) {
return o[ dtype2 ];
}
}
return null;
}
// EXPORTS //
module.exports = promotionRules;
|