97 lines
2.1 KiB
JavaScript
97 lines
2.1 KiB
JavaScript
|
/**
|
||
|
|
* @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';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 Function( f ) )(); // eslint-disable-line no-new-func
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|