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
;
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.createSymbolNode = void 0;
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _possibleConstructorReturn2 = _interopRequireDefault(require("@babel/runtime/helpers/possibleConstructorReturn"));
var _getPrototypeOf2 = _interopRequireDefault(require("@babel/runtime/helpers/getPrototypeOf"));
var _inherits2 = _interopRequireDefault(require("@babel/runtime/helpers/inherits"));
var _string = require("../../utils/string.js");
var _customs = require("../../utils/customs.js");
var _factory = require("../../utils/factory.js");
var _latex = require("../../utils/latex.js");
function _callSuper(t, o, e) { return o = (0, _getPrototypeOf2["default"])(o), (0, _possibleConstructorReturn2["default"])(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], (0, _getPrototypeOf2["default"])(t).constructor) : o.apply(t, e)); }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
var name = 'SymbolNode';
var dependencies = ['math', '?Unit', 'Node'];
var createSymbolNode = exports.createSymbolNode = /* #__PURE__ */(0, _factory.factory)(name, dependencies, function (_ref) {
var math = _ref.math,
Unit = _ref.Unit,
Node = _ref.Node;
/**
* Check whether some name is a valueless unit like "inch".
* @param {string} name
* @return {boolean}
*/
function isValuelessUnit(name) {
return Unit ? Unit.isValuelessUnit(name) : false;
}
var SymbolNode = /*#__PURE__*/function (_Node) {
(0, _inherits2["default"])(SymbolNode, _Node);
/**
* @constructor SymbolNode
* @extends {Node}
* A symbol node can hold and resolve a symbol
* @param {string} name
* @extends {Node}
*/
function SymbolNode(name) {
var _this;
(0, _classCallCheck2["default"])(this, SymbolNode);
_this = _callSuper(this, SymbolNode);
// validate input
if (typeof name !== 'string') {
throw new TypeError('String expected for parameter "name"');
}
_this.name = name;
return _this;
}
(0, _createClass2["default"])(SymbolNode, [{
key: "type",
get: function get() {
return 'SymbolNode';
}
}, {
key: "isSymbolNode",
get: function get() {
return 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: *)
*/
}, {
key: "_compile",
value: function _compile(math, argNames) {
var name = this.name;
if (argNames[name] === true) {
// this is a FunctionAssignment argument
// (like an x when inside the expression of a function
// assignment `f(x) = ...`)
return function (scope, args, context) {
return (0, _customs.getSafeProperty)(args, name);
};
} else if (name in math) {
return function (scope, args, context) {
return scope.has(name) ? scope.get(name) : (0, _customs.getSafeProperty)(math, name);
};
} else {
var isUnit = isValuelessUnit(name);
return function (scope, args, context) {
return scope.has(name) ? scope.get(name) : isUnit ? new Unit(null, name) : SymbolNode.onUndefinedSymbol(name);
};
}
}
/**
* Execute a callback for each of the child nodes of this node
* @param {function(child: Node, path: string, parent: Node)} callback
*/
}, {
key: "forEach",
value: function forEach(callback) {
// nothing to do, we don't have any children
}
/**
* Create a new SymbolNode with children produced by the given callback.
* Trivial since a SymbolNode has no children
* @param {function(child: Node, path: string, parent: Node) : Node} callback
* @returns {SymbolNode} Returns a clone of the node
*/
}, {
key: "map",
value: function map(callback) {
return this.clone();
}
/**
* Throws an error 'Undefined symbol {name}'
* @param {string} name
*/
}, {
key: "clone",
value:
/**
* Create a clone of this node, a shallow copy
* @return {SymbolNode}
*/
function clone() {
return new SymbolNode(this.name);
}
/**
* Get string representation
* @param {Object} options
* @return {string} str
* @override
*/
}, {
key: "_toString",
value: function _toString(options) {
return this.name;
}
/**
* Get HTML representation
* @param {Object} options
* @return {string} str
* @override
*/
}, {
key: "_toHTML",
value: function _toHTML(options) {
var name = (0, _string.escape)(this.name);
if (name === 'true' || name === 'false') {
return '<span class="math-symbol math-boolean">' + name + '</span>';
} else if (name === 'i') {
return '<span class="math-symbol math-imaginary-symbol">' + name + '</span>';
} else if (name === 'Infinity') {
return '<span class="math-symbol math-infinity-symbol">' + name + '</span>';
} else if (name === 'NaN') {
return '<span class="math-symbol math-nan-symbol">' + name + '</span>';
} else if (name === 'null') {
return '<span class="math-symbol math-null-symbol">' + name + '</span>';
} else if (name === 'undefined') {
return '<span class="math-symbol math-undefined-symbol">' + name + '</span>';
}
return '<span class="math-symbol">' + name + '</span>';
}
/**
* Get a JSON representation of the node
* @returns {Object}
*/
}, {
key: "toJSON",
value: function toJSON() {
return {
mathjs: 'SymbolNode',
name: this.name
};
}
/**
* Instantiate a SymbolNode from its JSON representation
* @param {Object} json An object structured like
* `{"mathjs": "SymbolNode", name: "x"}`,
* where mathjs is optional
* @returns {SymbolNode}
*/
}, {
key: "_toTex",
value:
/**
* Get LaTeX representation
* @param {Object} options
* @return {string} str
* @override
*/
function _toTex(options) {
var isUnit = false;
if (typeof math[this.name] === 'undefined' && isValuelessUnit(this.name)) {
isUnit = true;
}
var symbol = (0, _latex.toSymbol)(this.name, isUnit);
if (symbol[0] === '\\') {
// no space needed if the symbol starts with '\'
return symbol;
}
// the space prevents symbols from breaking stuff like '\cdot'
// if it's written right before the symbol
return ' ' + symbol;
}
}], [{
key: "onUndefinedSymbol",
value: function onUndefinedSymbol(name) {
throw new Error('Undefined symbol ' + name);
}
}, {
key: "fromJSON",
value: function fromJSON(json) {
return new SymbolNode(json.name);
}
}]);
return SymbolNode;
}(Node);
return SymbolNode;
}, {
isClass: true,
isNode: true
});