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* @license Apache-2.0
*
* Copyright (c) 2020 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 isArrayLikeObject = require( '@stdlib/assert/is-array-like-object' );
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var resolve = require( '@stdlib/ndarray/base/dtype-resolve-str' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Transforms a list of array argument data types into a list of signatures.
*
* @param {ArrayLikeObject} dtypes - list of array argument data types
* @param {NonNegativeInteger} nin - number of input array arguments
* @param {NonNegativeInteger} nout - number of output array arguments
* @throws {TypeError} first argument must be an array-like object
* @throws {TypeError} second argument must be a nonnegative integer
* @throws {TypeError} third argument must be a nonnegative integer
* @throws {RangeError} first argument must contain at least one element
* @throws {RangeError} length of the first argument is incompatible with the second and third arguments
* @returns {StringArray} list of signatures
*
* @example
* var dtypes = [
* 'float64', 'float64',
* 'float32', 'float32'
* ];
*
* var sigs = dtypes2signatures( dtypes, 1, 1 );
* // returns [ '(float64) => (float64)', '(float32) => (float32)' ]
*/
function dtypes2signatures( dtypes, nin, nout ) {
var len;
var out;
var tmp;
var dt;
var N;
var M;
var i;
var m;
if ( !isArrayLikeObject( dtypes ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an array-like object. Value: `%s`.', dtypes ) );
}
if ( !isNonNegativeInteger( nin ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', nin ) );
}
if ( !isNonNegativeInteger( nout ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a nonnegative integer. Value: `%s`.', nout ) );
}
len = dtypes.length;
if ( len === 0 ) {
throw new RangeError( 'invalid argument. First argument must contain at least one element.' );
}
N = nin + nout;
if ( len%N !== 0 ) {
throw new RangeError( 'invalid arguments. Length of the first argument is incompatible with the second and third arguments.' );
}
out = [];
// Create a temporary array for storing signatures...
tmp = [];
// [ '(', <in_dtype>, ', ', ..., ') => (', <out_dtype>, ', ', ..., ')' ] => 1+nin+nin-1+1+nout+nout-1+1 => 1 + (2*nin) + (2*nout) => 1 + (2*(nin+nout))
M = 2 * N;
m = 2 * nin;
for ( i = 0; i <= M; i++ ) {
if ( i === 0 ) {
if ( i === m ) {
tmp.push( '() => (' );
} else {
tmp.push( '(' );
}
} else if ( i === M ) {
if ( i === m ) {
tmp.push( ') => ()' );
} else {
tmp.push( ')' );
}
} else if ( i === m ) {
tmp.push( ') => (' );
} else if ( i%2 === 1 ) {
tmp.push( '' );
} else {
tmp.push( ', ' );
}
}
for ( i = 0; i < len; i++ ) {
dt = resolve( dtypes[ i ] );
if ( dt === null ) {
dt = dtypes[ i ];
}
m = i % N;
tmp[ (2*m)+1 ] = dt;
if ( m === N-1 ) {
out.push( tmp.join( '' ) );
}
}
return out;
}
// EXPORTS //
module.exports = dtypes2signatures;
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