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| 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 99 100 101 102 103 104 105 106 107 108 109 110 | 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 36x 36x 36x 36x 648x 648x 648x 36x 36x 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 1x 1x 1x 1x 276x 276x 276x 2x 2x 274x 276x 262x 262x 262x 256x 256x 262x 18x 276x 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/ndarray/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 ndarray data type with the smallest size and closest "kind" to which ndarray data types can be safely cast.
*
* @param {*} [dtype1] - ndarray data type value
* @param {*} [dtype2] - ndarray 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( 'binary', 'generic' );
* // returns -1
*
* @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;
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