time-to-botec

Benchmark sampling in different programming languages
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main.js (2208B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var objectKeys = require( '@stdlib/utils/keys' );
     24 var hasOwnProp = require( '@stdlib/assert/has-own-property' );
     25 var PROMOTION_RULES = require( './promotion_rules.json' );
     26 
     27 
     28 // FUNCTIONS //
     29 
     30 /**
     31 * Generates a full table of promotion rules.
     32 *
     33 * @private
     34 * @returns {Object} table
     35 */
     36 function generateFullTable() {
     37 	var dtypes;
     38 	var ntypes;
     39 	var out;
     40 	var tmp;
     41 	var dt1;
     42 	var dt2;
     43 	var o;
     44 	var j;
     45 	var i;
     46 
     47 	out = {};
     48 	dtypes = objectKeys( PROMOTION_RULES );
     49 	ntypes = dtypes.length;
     50 	for ( i = 0; i < ntypes; i++ ) {
     51 		dt1 = dtypes[ i ];
     52 		o = PROMOTION_RULES[ dt1 ];
     53 		tmp = {};
     54 		for ( j = 0; j < ntypes; j++ ) {
     55 			dt2 = dtypes[ j ];
     56 			tmp[ dt2 ] = o[ dt2 ];
     57 		}
     58 		out[ dt1 ] = tmp;
     59 	}
     60 	return out;
     61 }
     62 
     63 
     64 // MAIN //
     65 
     66 /**
     67 * Returns the array data type with the smallest size and closest "kind" to which array data types can be safely cast.
     68 *
     69 * @param {string} [dtype1] - array data type
     70 * @param {string} [dtype2] - array data type
     71 * @returns {(Object|integer|string|null)} promotion rule(s) or null
     72 *
     73 * @example
     74 * var table = promotionRules();
     75 * // returns {...}
     76 *
     77 * @example
     78 * var dt = promotionRules( 'float32', 'uint32' );
     79 * // returns 'float64'
     80 *
     81 * @example
     82 * var dt = promotionRules( 'float32', 'foo' );
     83 * // returns null
     84 */
     85 function promotionRules( dtype1, dtype2 ) {
     86 	var o;
     87 	if ( arguments.length === 0 ) {
     88 		return generateFullTable();
     89 	}
     90 	if ( hasOwnProp( PROMOTION_RULES, dtype1 ) ) {
     91 		o = PROMOTION_RULES[ dtype1 ];
     92 		if ( hasOwnProp( o, dtype2 ) ) {
     93 			return o[ dtype2 ];
     94 		}
     95 	}
     96 	return null;
     97 }
     98 
     99 
    100 // EXPORTS //
    101 
    102 module.exports = promotionRules;