208 lines
7.5 KiB
JavaScript
208 lines
7.5 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
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var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' );
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var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
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var isFunctionArray = require( '@stdlib/assert/is-function-array' );
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var isFunction = require( '@stdlib/assert/is-function' );
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var isStringArray = require( '@stdlib/assert/is-string-array' ).primitives;
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var isCollection = require( '@stdlib/assert/is-collection' );
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var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
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var indexOfTypes = require( './index_of_types.js' );
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// MAIN //
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/**
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* Returns an ndarray function interface which performs multiple dispatch.
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*
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* @param {(FunctionArray|Function)} fcns - list of ndarray functions
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* @param {StringArray} types - one-dimensional list of ndarray argument data types
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* @param {(Collection|null)} data - ndarray function data (e.g., callbacks)
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* @param {PositiveInteger} nargs - total number of ndarray function interface arguments
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* @param {NonNegativeInteger} nin - number of input ndarrays
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* @param {NonNegativeInteger} nout - number of output ndarrays
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* @throws {TypeError} first argument must be either a function or an array of functions
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* @throws {TypeError} second argument must be an array of strings
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* @throws {TypeError} third argument must be an array-like object or `null`
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* @throws {Error} third and first arguments must have the same number of elements
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* @throws {TypeError} fourth argument must be a positive integer
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* @throws {TypeError} fifth argument must be a nonnegative integer
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* @throws {TypeError} sixth argument must be a nonnegative integer
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* @throws {Error} fourth argument must equal the specified number of input and output arrays
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* @throws {Error} number of types must match the number of functions times the total number of array arguments for each function
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* @throws {Error} interface must accept at least one input and/or output ndarray
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* @returns {Function} ndarray function interface
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*
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* @example
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* var unary = require( '@stdlib/ndarray/base/unary' );
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* var abs = require( '@stdlib/math/base/special/abs' );
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* var Float64Array = require( '@stdlib/array/float64' );
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* var ndarray = require( '@stdlib/ndarray/ctor' );
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*
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* var types = [
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* 'float64', 'float64'
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* ];
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*
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* var data = [
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* abs
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* ];
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*
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* var absolute = dispatch( unary, types, data, 2, 1, 1 );
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*
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* // ...
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*
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* var xbuf = new Float64Array( [ -1.0, -2.0, -3.0, -4.0, -5.0 ] );
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* var ybuf = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
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*
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* var x = ndarray( 'float64', xbuf, [ 5 ], [ 1 ], 0, 'row-major' );
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* var y = ndarray( 'float64', ybuf, [ 5 ], [ 1 ], 0, 'row-major' );
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*
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* absolute( x, y );
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* // ybuf => <Float64Array>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]
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*/
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function dispatch( fcns, types, data, nargs, nin, nout ) {
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var narrays;
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var nfcns;
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var fcn;
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if ( isFunction( fcns ) ) {
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fcn = fcns;
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} else if ( !isFunctionArray( fcns ) ) {
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throw new TypeError( 'invalid argument. First argument must be either a function or an array of functions. Value: `' + fcns + '`.' );
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}
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if ( !isStringArray( types ) ) {
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throw new TypeError( 'invalid argument. Second argument must be an array of strings. Value: `' + types + '`.' );
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}
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if ( !isCollection( data ) && data !== null ) {
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throw new TypeError( 'invalid argument. Third argument must be an array-like object or `null`. Value: `' + data + '`.' );
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}
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if ( !isPositiveInteger( nargs ) ) {
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throw new TypeError( 'invalid argument. Fourth argument must be a positive integer. Value: `' + nargs + '`.' );
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}
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if ( !isNonNegativeInteger( nin ) ) {
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throw new TypeError( 'invalid argument. Fifth argument must be a nonnegative integer. Value: `' + nin + '`.' );
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}
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if ( !isNonNegativeInteger( nout ) ) {
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throw new TypeError( 'invalid argument. Sixth argument must be a nonnegative integer. Value: `' + nout + '`.' );
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}
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narrays = nin + nout;
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if ( narrays === 0 ) {
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throw new Error( 'invalid arguments. Interface must accept at least one input and/or output ndarray. Based on the provided arguments, `nin+nout` equals `0`.' );
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}
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if ( nargs !== narrays ) {
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throw new Error( 'invalid arguments. Fourth argument does not equal the number of input and output ndarrays.' );
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}
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if ( fcn ) {
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nfcns = types.length / narrays;
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if ( !isInteger( nfcns ) ) {
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throw new Error( 'invalid argument. Unexpected number of types. A type must be specified for each input and output ndarray for each provided ndarray function.' );
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}
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} else {
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nfcns = fcns.length;
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if ( types.length !== nfcns*narrays ) {
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throw new Error( 'invalid argument. Unexpected number of types. A type must be specified for each input and output ndarray for each provided ndarray function.' );
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}
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}
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if ( data && data.length !== nfcns ) {
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throw new Error( 'invalid argument. The third argument must have the same number of elements as the first argument.' );
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}
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return dispatcher;
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/**
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* ndarray function interface which performs multiple dispatch.
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*
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* @private
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* @param {ndarrayLike} x - ndarray
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* @param {...ndarrayLike} args - ndarray arguments
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* @throws {Error} insufficient arguments
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* @throws {Error} too many arguments
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* @throws {TypeError} input array arguments must be ndarray-like objects
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* @throws {TypeError} output array arguments must be ndarray-like objects
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* @throws {TypeError} unable to resolve an ndarray function supporting the provided ndarray argument data types
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* @returns {(ndarrayLike|Array<ndarrayLike>|void)} destination array(s)
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*/
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function dispatcher() {
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var arrays;
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var dtypes;
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var argc;
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var idx;
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var v;
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var f;
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var i;
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argc = arguments.length;
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if ( argc !== nargs ) {
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if ( argc < nargs ) {
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throw new Error( 'invalid invocation. Insufficient arguments.' );
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}
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throw new Error( 'invalid invocation. Too many arguments.' );
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}
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arrays = [];
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dtypes = [];
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for ( i = 0; i < nargs; i++ ) {
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v = arguments[ i ];
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if ( !isndarrayLike( v ) ) {
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if ( i < nin ) {
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throw new TypeError( 'invalid argument. Input array argument must be an ndarray-like object.' );
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} else {
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throw new TypeError( 'invalid argument. Output array argument must be an ndarray-like object.' );
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}
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}
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arrays.push( v );
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dtypes.push( v.dtype );
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}
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// Resolve the ndarray function satisfying the input array types:
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idx = indexOfTypes( nfcns, narrays, types, narrays, 1, 0, dtypes, 1, 0 ); // eslint-disable-line max-len
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// Check whether we were able to successfully resolve an ndarray function:
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if ( idx < 0 ) {
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throw new TypeError( 'invalid arguments. Unable to resolve an ndarray function supporting the provided array argument data types.' );
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}
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// Retrieve the ndarray function:
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if ( fcn ) {
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f = fcn;
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} else {
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f = fcns[ idx ];
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}
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// Evaluate the ndarray function:
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if ( data ) {
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f( arrays, data[ idx ] );
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} else {
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f( arrays );
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}
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if ( nout === 1 ) {
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return arrays[ narrays-1 ];
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}
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if ( nout === 0 ) {
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return;
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}
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return arrays.slice( nin );
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}
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}
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// EXPORTS //
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module.exports = dispatch;
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