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/**
* @license Apache-2.0
*
* Copyright (c) 2024 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 isComplexDataType = require( '@stdlib/ndarray/base/assert/is-complex-floating-point-data-type' );
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var isReadOnly = require( '@stdlib/ndarray/base/assert/is-read-only' );
var getDType = require( '@stdlib/ndarray/dtype' );
var getShape = require( '@stdlib/ndarray/shape' );
var getStrides = require( '@stdlib/ndarray/strides' );
var getOffset = require( '@stdlib/ndarray/offset' );
var getOrder = require( '@stdlib/ndarray/order' );
var numel = require( '@stdlib/ndarray/base/numel' );
var ind2sub = require( '@stdlib/ndarray/base/ind2sub' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );
var format = require( '@stdlib/string/format' );
// FUNCTIONS //
/**
* Tests whether an object has a specified method.
*
* @private
* @param {Object} obj - input object
* @param {string} method - method name
* @returns {boolean} boolean indicating whether an object has a specified method
*
* @example
* var bool = hasMethod( [], 'toJSON' );
* // returns false
*/
function hasMethod( obj, method ) {
return ( typeof obj[ method ] === 'function' );
}
// MAIN //
/**
* Serializes an ndarray as a JSON object.
*
* ## Notes
*
* - The function does **not** serialize data outside of the buffer region defined by the ndarray view.
*
* @param {ndarrayLike} x - input ndarray
* @throws {TypeError} must provide an ndarray-like object
* @returns {Object} JSON representation
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] );
* // returns <ndarray>
*
* var o = toJSON( x );
* // returns {...}
*/
function toJSON( x ) {
var out;
var len;
var sh;
var st;
var o;
var v;
var i;
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. Must provide an ndarray. Value: `%s`.', x ) );
}
// Defer to input argument's custom implementation, if already defined...
if ( hasMethod( x, 'toJSON' ) ) {
return x.toJSON();
}
// Build an object containing all ndarray properties needed to revive a serialized ndarray...
out = {};
out.type = 'ndarray';
out.dtype = getDType( x );
out.flags = {
'READONLY': isReadOnly( x )
};
out.order = getOrder( x );
sh = getShape( x );
out.shape = sh;
st = getStrides( x );
out.strides = st.slice();
o = getOffset( x );
len = numel( out.shape );
// Flip the signs of negative strides:
for ( i = 0; i < st.length; i++ ) {
if ( out.strides[ i ] < 0 ) {
out.strides[ i ] *= -1;
}
}
// Cast data to generic array...
out.data = [];
if ( isComplexDataType( out.dtype ) ) {
for ( i = 0; i < len; i++ ) {
v = x.get.apply( x, ind2sub( sh, st, o, out.order, i, 'throw' ) );
out.data.push( real( v ), imag( v ) );
}
} else {
for ( i = 0; i < len; i++ ) {
out.data.push( x.get.apply( x, ind2sub( sh, st, o, out.order, i, 'throw' ) ) );
}
}
return out;
}
// EXPORTS //
module.exports = toJSON;
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