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* @license Apache-2.0
*
* Copyright (c) 2022 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 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 complex number data type with the smallest size and closest "kind" to which data types can be safely cast.
*
* @param {string} [dtype1] - data type
* @param {string} [dtype2] - data type
* @returns {(Object|integer|string|null)} promotion rule(s) or null
*
* @example
* var table = promotionRules();
* // returns {...}
*
* @example
* var dt = promotionRules( 'complex128', 'complex64' );
* // returns 'complex128'
*
* @example
* var dt = promotionRules( 'complex128', 'foo' );
* // returns null
*/
function promotionRules( dtype1, dtype2 ) {
var o;
if ( arguments.length === 0 ) {
return generateFullTable();
}
if ( hasOwnProp( PROMOTION_RULES, dtype1 ) ) {
o = PROMOTION_RULES[ dtype1 ];
if ( hasOwnProp( o, dtype2 ) ) {
return o[ dtype2 ];
}
}
return null;
}
// EXPORTS //
module.exports = promotionRules;
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