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* @license Apache-2.0
*
* Copyright (c) 2026 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.
*/
/* eslint-disable max-len, max-params */
'use strict';
// MODULES //
var max = require( '@stdlib/math/base/special/fast/max' );
var isLayout = require( '@stdlib/blas/base/assert/is-layout' );
var resolveStr = require( '@stdlib/blas/base/transpose-operation-resolve-str' );
var isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major-string' );
var isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// MAIN //
/**
* Takes rows from one of two input matrices depending on a condition.
*
* @param {string} order - storage layout
* @param {(integer|string)} transA - specifies whether `A` should be transposed or not transposed
* @param {(integer|string)} transB - specifies whether `B` should be transposed or not transposed
* @param {NonNegativeInteger} M - number of indexed elements in `condition` and number of rows in `op(A)`, `op(B)`, and `out`
* @param {NonNegativeInteger} N - number of columns in `op(A)`, `op(B)` and `out`
* @param {Collection} condition - condition array
* @param {integer} strideC - stride length for `condition`
* @param {Collection} A - first input matrix
* @param {PositiveInteger} LDA - stride length for the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @param {Collection} B - second input matrix
* @param {PositiveInteger} LDB - stride length for the first dimension of `B` (a.k.a., leading dimension of the matrix `B`)
* @param {Collection} out - output matrix
* @param {PositiveInteger} LDO - stride length for the first dimension of `out` (a.k.a., leading dimension of the output matrix)
* @throws {TypeError} first argument must be a valid order
* @throws {TypeError} second argument must be a valid transpose operation
* @throws {TypeError} third argument must be a valid transpose operation
* @throws {RangeError} fourth argument must be a nonnegative integer
* @throws {RangeError} fifth argument must be a nonnegative integer
* @throws {RangeError} ninth argument must be greater than or equal to max(1,M) when `A` is not transposed and max(1,N) otherwise
* @throws {RangeError} eleventh argument must be greater than or equal to max(1,M) when `B` is not transposed and max(1,N) otherwise
* @throws {RangeError} thirteenth argument must be greater than or equal to max(1,N)
* @returns {Collection} output matrix
*
* @example
* var A = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var B = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
* var condition = [ 1, 0 ];
* var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gwhereRows( 'row-major', 'no-transpose', 'no-transpose', 2, 3, condition, 1, A, 3, B, 3, out, 3 );
* // out => [ 1.0, 2.0, 3.0, 10.0, 11.0, 12.0 ]
*/
function gwhereRows( order, transA, transB, M, N, condition, strideC, A, LDA, B, LDB, out, LDO ) {
var nrowsa;
var nrowsb;
var valout;
var isrm;
var iscm;
var sa1;
var sa2;
var sb1;
var sb2;
var so1;
var so2;
var ta;
var tb;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
ta = resolveStr( transA );
if ( ta === null ) {
throw new TypeError( format( 'invalid argument. Second argument must be a valid transpose operation. Value: `%s`.', transA ) );
}
tb = resolveStr( transB );
if ( tb === null ) {
throw new TypeError( format( 'invalid argument. Third argument must be a valid transpose operation. Value: `%s`.', transB ) );
}
if ( M < 0 ) {
throw new RangeError( format( 'invalid argument. Fourth argument must be a nonnegative integer. Value: `%d`.', M ) );
}
if ( N < 0 ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be a nonnegative integer. Value: `%d`.', N ) );
}
isrm = isRowMajor( order );
iscm = isColumnMajor( order );
if (
( isrm && transA === 'no-transpose' ) ||
( iscm && transA === 'transpose' )
) {
nrowsa = N;
} else {
nrowsa = M;
}
if (
( isrm && transB === 'no-transpose' ) ||
( iscm && transB === 'transpose' )
) {
nrowsb = N;
} else {
nrowsb = M;
}
if ( LDA < max( 1, nrowsa ) ) {
throw new RangeError( format( 'invalid argument. Ninth argument must be greater than or equal to max(1,%d). Value: `%d`.', nrowsa, LDA ) );
}
if ( LDB < max( 1, nrowsb ) ) {
throw new RangeError( format( 'invalid argument. Eleventh argument must be greater than or equal to max(1,%d). Value: `%d`.', nrowsb, LDB ) );
}
if ( isrm ) {
valout = N;
} else {
valout = M;
}
if ( LDO < max( 1, valout ) ) {
throw new RangeError( format( 'invalid argument. Thirteenth argument must be greater than or equal to max(1,%d). Value: `%d`.', valout, LDO ) );
}
if ( iscm ) {
sa1 = 1;
sa2 = LDA;
sb1 = 1;
sb2 = LDB;
so1 = 1;
so2 = LDO;
} else { // order === 'row-major'
sa1 = LDA;
sa2 = 1;
sb1 = LDB;
sb2 = 1;
so1 = LDO;
so2 = 1;
}
return base( ta, tb, M, N, condition, strideC, 0, A, sa1, sa2, 0, B, sb1, sb2, 0, out, so1, so2, 0 );
}
// EXPORTS //
module.exports = gwhereRows;
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