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* @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';
// MAIN //
/**
* Computes the minimum and maximum linear indices in an underlying data buffer which are accessible to an array view.
*
* @param {NonNegativeIntegerArray} shape - array shape
* @param {IntegerArray} strides - stride array
* @param {NonNegativeInteger} offset - index offset
* @returns {Array} linear indices
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ 10, 1 ];
* var offset = 10;
*
* var idx = minmaxViewBufferIndex( shape, strides, offset );
* // returns [ 10, 109 ]
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ -10, -1 ];
* var offset = 99;
*
* var idx = minmaxViewBufferIndex( shape, strides, offset );
* // returns [ 0, 99 ]
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ 1, 10 ];
* var offset = 10;
*
* var idx = minmaxViewBufferIndex( shape, strides, offset );
* // returns [ 10, 109 ]
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ -1, -10 ];
* var offset = 99;
*
* var idx = minmaxViewBufferIndex( shape, strides, offset );
* // returns [ 0, 99 ]
*/
function minmaxViewBufferIndex( shape, strides, offset ) {
var ndims;
var min;
var max;
var s;
var i;
ndims = shape.length;
min = offset;
max = offset;
for ( i = 0; i < ndims; i++ ) {
if ( shape[ i ] === 0 ) {
return [ offset, offset ];
}
s = strides[ i ];
if ( s > 0 ) {
max += s * ( shape[i]-1 );
} else if ( s < 0 ) {
min += s * ( shape[i]-1 ); // decrements min
}
}
return [ min, max ];
}
// EXPORTS //
module.exports = minmaxViewBufferIndex;
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