mathjs/es/expression/node/Node.js

function _typeof(obj) { "@babel/helpers - typeof"; 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); }

import { isNode } from '../../utils/is';
import { keywords } from '../keywords';
import { deepStrictEqual, hasOwnProperty } from '../../utils/object';
import { factory } from '../../utils/factory';
var name = 'Node';
var dependencies = ['mathWithTransform'];
export var createNode = /* #__PURE__ */factory(name, dependencies, function (_ref) {
  var mathWithTransform = _ref.mathWithTransform;

  /**
   * Node
   */
  function Node() {
    if (!(this instanceof Node)) {
      throw new SyntaxError('Constructor must be called with the new operator');
    }
  }
  /**
   * Evaluate the node
   * @param {Object} [scope]  Scope to read/write variables
   * @return {*}              Returns the result
   */


  Node.prototype.evaluate = function (scope) {
    return this.compile().evaluate(scope);
  };

  Node.prototype.type = 'Node';
  Node.prototype.isNode = true;
  Node.prototype.comment = '';
  /**
   * Compile the node into an optimized, evauatable JavaScript function
   * @return {{evaluate: function([Object])}} object
   *                Returns an object with a function 'evaluate',
   *                which can be invoked as expr.evaluate([scope: Object]),
   *                where scope is an optional object with
   *                variables.
   */

  Node.prototype.compile = function () {
    var expr = this._compile(mathWithTransform, {});

    var args = {};
    var context = null;

    function evaluate(scope) {
      var s = scope || {};

      _validateScope(s);

      return expr(s, args, context);
    }

    return {
      evaluate: evaluate
    };
  };
  /**
   * 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: *)
   */


  Node.prototype._compile = function (math, argNames) {
    throw new Error('Method _compile should be implemented by type ' + this.type);
  };
  /**
   * Execute a callback for each of the child nodes of this node
   * @param {function(child: Node, path: string, parent: Node)} callback
   */


  Node.prototype.forEach = function (callback) {
    // must be implemented by each of the Node implementations
    throw new Error('Cannot run forEach on a Node interface');
  };
  /**
   * Create a new Node 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 {OperatorNode} Returns a transformed copy of the node
   */


  Node.prototype.map = function (callback) {
    // must be implemented by each of the Node implementations
    throw new Error('Cannot run map on a Node interface');
  };
  /**
   * Validate whether an object is a Node, for use with map
   * @param {Node} node
   * @returns {Node} Returns the input if it's a node, else throws an Error
   * @protected
   */


  Node.prototype._ifNode = function (node) {
    if (!isNode(node)) {
      throw new TypeError('Callback function must return a Node');
    }

    return node;
  };
  /**
   * Recursively traverse all nodes in a node tree. Executes given callback for
   * this node and each of its child nodes.
   * @param {function(node: Node, path: string, parent: Node)} callback
   *          A callback called for every node in the node tree.
   */


  Node.prototype.traverse = function (callback) {
    // execute callback for itself
    callback(this, null, null); // eslint-disable-line standard/no-callback-literal
    // recursively traverse over all childs of a node

    function _traverse(node, callback) {
      node.forEach(function (child, path, parent) {
        callback(child, path, parent);

        _traverse(child, callback);
      });
    }

    _traverse(this, callback);
  };
  /**
   * Recursively transform a node tree via a transform function.
   *
   * For example, to replace all nodes of type SymbolNode having name 'x' with a
   * ConstantNode with value 2:
   *
   *     const res = Node.transform(function (node, path, parent) {
   *       if (node && node.isSymbolNode) && (node.name === 'x')) {
   *         return new ConstantNode(2)
   *       }
   *       else {
   *         return node
   *       }
   *     })
   *
   * @param {function(node: Node, path: string, parent: Node) : Node} callback
   *          A mapping function accepting a node, and returning
   *          a replacement for the node or the original node.
   *          Signature: callback(node: Node, index: string, parent: Node) : Node
   * @return {Node} Returns the original node or its replacement
   */


  Node.prototype.transform = function (callback) {
    function _transform(child, path, parent) {
      var replacement = callback(child, path, parent);

      if (replacement !== child) {
        // stop iterating when the node is replaced
        return replacement;
      }

      return child.map(_transform);
    }

    return _transform(this, null, null);
  };
  /**
   * Find any node in the node tree matching given filter function. For example, to
   * find all nodes of type SymbolNode having name 'x':
   *
   *     const results = Node.filter(function (node) {
   *       return (node && node.isSymbolNode) && (node.name === 'x')
   *     })
   *
   * @param {function(node: Node, path: string, parent: Node) : Node} callback
   *            A test function returning true when a node matches, and false
   *            otherwise. Function signature:
   *            callback(node: Node, index: string, parent: Node) : boolean
   * @return {Node[]} nodes       An array with nodes matching given filter criteria
   */


  Node.prototype.filter = function (callback) {
    var nodes = [];
    this.traverse(function (node, path, parent) {
      if (callback(node, path, parent)) {
        nodes.push(node);
      }
    });
    return nodes;
  };
  /**
   * Create a shallow clone of this node
   * @return {Node}
   */


  Node.prototype.clone = function () {
    // must be implemented by each of the Node implementations
    throw new Error('Cannot clone a Node interface');
  };
  /**
   * Create a deep clone of this node
   * @return {Node}
   */


  Node.prototype.cloneDeep = function () {
    return this.map(function (node) {
      return node.cloneDeep();
    });
  };
  /**
   * Deep compare this node with another node.
   * @param {Node} other
   * @return {boolean} Returns true when both nodes are of the same type and
   *                   contain the same values (as do their childs)
   */


  Node.prototype.equals = function (other) {
    return other ? deepStrictEqual(this, other) : false;
  };
  /**
   * Get string representation. (wrapper function)
   *
   * This function can get an object of the following form:
   * {
   *    handler: //This can be a callback function of the form
   *             // "function callback(node, options)"or
   *             // a map that maps function names (used in FunctionNodes)
   *             // to callbacks
   *    parenthesis: "keep" //the parenthesis option (This is optional)
   * }
   *
   * @param {Object} [options]
   * @return {string}
   */


  Node.prototype.toString = function (options) {
    var customString;

    if (options && _typeof(options) === 'object') {
      switch (_typeof(options.handler)) {
        case 'object':
        case 'undefined':
          break;

        case 'function':
          customString = options.handler(this, options);
          break;

        default:
          throw new TypeError('Object or function expected as callback');
      }
    }

    if (typeof customString !== 'undefined') {
      return customString;
    }

    return this._toString(options);
  };
  /**
   * Get a JSON representation of the node
   * Both .toJSON() and the static .fromJSON(json) should be implemented by all
   * implementations of Node
   * @returns {Object}
   */


  Node.prototype.toJSON = function () {
    throw new Error('Cannot serialize object: toJSON not implemented by ' + this.type);
  };
  /**
   * Get HTML representation. (wrapper function)
   *
   * This function can get an object of the following form:
   * {
   *    handler: //This can be a callback function of the form
   *             // "function callback(node, options)" or
   *             // a map that maps function names (used in FunctionNodes)
   *             // to callbacks
   *    parenthesis: "keep" //the parenthesis option (This is optional)
   * }
   *
   * @param {Object} [options]
   * @return {string}
   */


  Node.prototype.toHTML = function (options) {
    var customString;

    if (options && _typeof(options) === 'object') {
      switch (_typeof(options.handler)) {
        case 'object':
        case 'undefined':
          break;

        case 'function':
          customString = options.handler(this, options);
          break;

        default:
          throw new TypeError('Object or function expected as callback');
      }
    }

    if (typeof customString !== 'undefined') {
      return customString;
    }

    return this.toHTML(options);
  };
  /**
   * Internal function to generate the string output.
   * This has to be implemented by every Node
   *
   * @throws {Error}
   */


  Node.prototype._toString = function () {
    // must be implemented by each of the Node implementations
    throw new Error('_toString not implemented for ' + this.type);
  };
  /**
   * Get LaTeX representation. (wrapper function)
   *
   * This function can get an object of the following form:
   * {
   *    handler: //This can be a callback function of the form
   *             // "function callback(node, options)"or
   *             // a map that maps function names (used in FunctionNodes)
   *             // to callbacks
   *    parenthesis: "keep" //the parenthesis option (This is optional)
   * }
   *
   * @param {Object} [options]
   * @return {string}
   */


  Node.prototype.toTex = function (options) {
    var customTex;

    if (options && _typeof(options) === 'object') {
      switch (_typeof(options.handler)) {
        case 'object':
        case 'undefined':
          break;

        case 'function':
          customTex = options.handler(this, options);
          break;

        default:
          throw new TypeError('Object or function expected as callback');
      }
    }

    if (typeof customTex !== 'undefined') {
      return customTex;
    }

    return this._toTex(options);
  };
  /**
   * Internal function to generate the LaTeX output.
   * This has to be implemented by every Node
   *
   * @param {Object} [options]
   * @throws {Error}
   */


  Node.prototype._toTex = function (options) {
    // must be implemented by each of the Node implementations
    throw new Error('_toTex not implemented for ' + this.type);
  };
  /**
   * Get identifier.
   * @return {string}
   */


  Node.prototype.getIdentifier = function () {
    return this.type;
  };
  /**
   * Get the content of the current Node.
   * @return {Node} node
   **/


  Node.prototype.getContent = function () {
    return this;
  };
  /**
   * Validate the symbol names of a scope.
   * Throws an error when the scope contains an illegal symbol.
   * @param {Object} scope
   */


  function _validateScope(scope) {
    for (var symbol in scope) {
      if (hasOwnProperty(scope, symbol)) {
        if (symbol in keywords) {
          throw new Error('Scope contains an illegal symbol, "' + symbol + '" is a reserved keyword');
        }
      }
    }
  }

  return Node;
}, {
  isClass: true,
  isNode: true
});