mathjs
Version:
Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif
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JavaScript
;
function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
var stringify = require('../../utils/string').stringify;
var escape = require('../../utils/string').escape;
var isSafeProperty = require('../../utils/customs').isSafeProperty;
var hasOwnProperty = require('../../utils/object').hasOwnProperty;
function factory(type, config, load, typed) {
var Node = load(require('./Node'));
/**
* @constructor ObjectNode
* @extends {Node}
* Holds an object with keys/values
* @param {Object.<string, Node>} [properties] object with key/value pairs
*/
function ObjectNode(properties) {
if (!(this instanceof ObjectNode)) {
throw new SyntaxError('Constructor must be called with the new operator');
}
this.properties = properties || {}; // validate input
if (properties) {
if (!(_typeof(properties) === 'object') || !Object.keys(properties).every(function (key) {
return type.isNode(properties[key]);
})) {
throw new TypeError('Object containing Nodes expected');
}
}
}
ObjectNode.prototype = new Node();
ObjectNode.prototype.type = 'ObjectNode';
ObjectNode.prototype.isObjectNode = true;
/**
* Compile a node into a JavaScript function.
* This basically pre-calculates as much as possible and only leaves open
* calculations which depend on a dynamic scope with variables.
* @param {Object} math Math.js namespace with functions and constants.
* @param {Object} argNames An object with argument names as key and `true`
* as value. Used in the SymbolNode to optimize
* for arguments from user assigned functions
* (see FunctionAssignmentNode) or special symbols
* like `end` (see IndexNode).
* @return {function} Returns a function which can be called like:
* evalNode(scope: Object, args: Object, context: *)
*/
ObjectNode.prototype._compile = function (math, argNames) {
var evalEntries = {};
for (var key in this.properties) {
if (hasOwnProperty(this.properties, key)) {
// we stringify/parse the key here to resolve unicode characters,
// so you cannot create a key like {"co\\u006Estructor": null}
var stringifiedKey = stringify(key);
var parsedKey = JSON.parse(stringifiedKey);
if (!isSafeProperty(this.properties, parsedKey)) {
throw new Error('No access to property "' + parsedKey + '"');
}
evalEntries[parsedKey] = this.properties[key]._compile(math, argNames);
}
}
return function evalObjectNode(scope, args, context) {
var obj = {};
for (var _key in evalEntries) {
if (hasOwnProperty(evalEntries, _key)) {
obj[_key] = evalEntries[_key](scope, args, context);
}
}
return obj;
};
};
/**
* Execute a callback for each of the child nodes of this node
* @param {function(child: Node, path: string, parent: Node)} callback
*/
ObjectNode.prototype.forEach = function (callback) {
for (var key in this.properties) {
if (this.properties.hasOwnProperty(key)) {
callback(this.properties[key], 'properties[' + stringify(key) + ']', this);
}
}
};
/**
* Create a new ObjectNode having it's childs be the results of calling
* the provided callback function for each of the childs of the original node.
* @param {function(child: Node, path: string, parent: Node): Node} callback
* @returns {ObjectNode} Returns a transformed copy of the node
*/
ObjectNode.prototype.map = function (callback) {
var properties = {};
for (var key in this.properties) {
if (this.properties.hasOwnProperty(key)) {
properties[key] = this._ifNode(callback(this.properties[key], 'properties[' + stringify(key) + ']', this));
}
}
return new ObjectNode(properties);
};
/**
* Create a clone of this node, a shallow copy
* @return {ObjectNode}
*/
ObjectNode.prototype.clone = function () {
var properties = {};
for (var key in this.properties) {
if (this.properties.hasOwnProperty(key)) {
properties[key] = this.properties[key];
}
}
return new ObjectNode(properties);
};
/**
* Get string representation
* @param {Object} options
* @return {string} str
* @override
*/
ObjectNode.prototype._toString = function (options) {
var entries = [];
for (var key in this.properties) {
if (this.properties.hasOwnProperty(key)) {
entries.push(stringify(key) + ': ' + this.properties[key].toString(options));
}
}
return '{' + entries.join(', ') + '}';
};
/**
* Get a JSON representation of the node
* @returns {Object}
*/
ObjectNode.prototype.toJSON = function () {
return {
mathjs: 'ObjectNode',
properties: this.properties
};
};
/**
* Instantiate an OperatorNode from its JSON representation
* @param {Object} json An object structured like
* `{"mathjs": "ObjectNode", "properties": {...}}`,
* where mathjs is optional
* @returns {ObjectNode}
*/
ObjectNode.fromJSON = function (json) {
return new ObjectNode(json.properties);
};
/**
* Get HTML representation
* @param {Object} options
* @return {string} str
* @override
*/
ObjectNode.prototype.toHTML = function (options) {
var entries = [];
for (var key in this.properties) {
if (this.properties.hasOwnProperty(key)) {
entries.push('<span class="math-symbol math-property">' + escape(key) + '</span>' + '<span class="math-operator math-assignment-operator math-property-assignment-operator math-binary-operator">:</span>' + this.properties[key].toHTML(options));
}
}
return '<span class="math-parenthesis math-curly-parenthesis">{</span>' + entries.join('<span class="math-separator">,</span>') + '<span class="math-parenthesis math-curly-parenthesis">}</span>';
};
/**
* Get LaTeX representation
* @param {Object} options
* @return {string} str
*/
ObjectNode.prototype._toTex = function (options) {
var entries = [];
for (var key in this.properties) {
if (this.properties.hasOwnProperty(key)) {
entries.push('\\mathbf{' + key + ':} & ' + this.properties[key].toTex(options) + '\\\\');
}
}
return "\\left\\{\\begin{array}{ll}".concat(entries.join('\n'), "\\end{array}\\right\\}");
};
return ObjectNode;
}
exports.name = 'ObjectNode';
exports.path = 'expression.node';
exports.factory = factory;