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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';
// MODULES //
var Fcn = require( '@stdlib/function/ctor' );
// MAIN //
/**
* Returns a function to flatten an array containing elements all having the same dimensions.
*
* @private
* @param {PositiveIntegerArray} dims - dimensions
* @returns {Function} flatten function
*/
function genFcn( dims ) {
var len;
var n;
var f;
var i;
// Code generation. Start with the function definition:
f = 'return function flattenArray(x){';
// Create the function body...
len = dims.length;
n = len - 1;
// Create the variables...
f += 'var o=[];var ';
for ( i = 0; i < len; i++ ) {
f += 'i' + i;
if ( i < n ) {
f += ',';
} else {
f += ';';
}
}
// Create the nested for loops...
for ( i = 0; i < len; i++ ) {
f += 'for(i' + i + '=0;i' + i + '<' + dims[ i ] + ';i' + i + '++){';
}
// Create the code which accesses the nested array values and pushes them onto the flattened array.
f += 'o.push(x';
for ( i = 0; i < len; i++ ) {
f += '[i' + i + ']';
}
f += ');';
// Closing braces...
for ( i = 0; i < len; i++ ) {
f += '}';
}
f += 'return o;';
// Close the function:
f += '}';
// Add a source directive for debugging:
f += '//# sourceURL=flatten_array.gen_fcn.js';
// Create the function in the global scope:
return ( new Fcn( f ) )();
/*
* e.g.,
*
* function flattenArray( x ) {
* var o = [];
* var i0, i1;
* for ( i0 = 0; i0 < 2; i0++ ) {
* for ( i1 = 0; i1 < 2; i1++ ) {
* o.push( x[i0][i1] );
* }
* }
* return o;
* }
*/
}
// EXPORTS //
module.exports = genFcn;
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