jiangchengfeiyi-xiaochengxu/node_modules/mathjs/lib/cjs/expression/node/RelationalNode.js

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.createRelationalNode = void 0;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _operators = require("../operators.js");
var _string = require("../../utils/string.js");
var _customs = require("../../utils/customs.js");
var _latex = require("../../utils/latex.js");
var _factory = require("../../utils/factory.js");
const name = 'RelationalNode';
const dependencies = ['Node'];
const createRelationalNode = exports.createRelationalNode = /* #__PURE__ */(0, _factory.factory)(name, dependencies, _ref => {
  let {
    Node
  } = _ref;
  const operatorMap = {
    equal: '==',
    unequal: '!=',
    smaller: '<',
    larger: '>',
    smallerEq: '<=',
    largerEq: '>='
  };
  class RelationalNode extends Node {
    /**
     * A node representing a chained conditional expression, such as 'x > y > z'
     *
     * @param {String[]} conditionals
     *     An array of conditional operators used to compare the parameters
     * @param {Node[]} params
     *     The parameters that will be compared
     *
     * @constructor RelationalNode
     * @extends {Node}
     */
    constructor(conditionals, params) {
      super();
      if (!Array.isArray(conditionals)) {
        throw new TypeError('Parameter conditionals must be an array');
      }
      if (!Array.isArray(params)) {
        throw new TypeError('Parameter params must be an array');
      }
      if (conditionals.length !== params.length - 1) {
        throw new TypeError('Parameter params must contain exactly one more element ' + 'than parameter conditionals');
      }
      this.conditionals = conditionals;
      this.params = params;
    }
    get type() {
      return name;
    }
    get isRelationalNode() {
      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: *)
     */
    _compile(math, argNames) {
      const self = this;
      const compiled = this.params.map(p => p._compile(math, argNames));
      return function evalRelationalNode(scope, args, context) {
        let evalLhs;
        let evalRhs = compiled[0](scope, args, context);
        for (let i = 0; i < self.conditionals.length; i++) {
          evalLhs = evalRhs;
          evalRhs = compiled[i + 1](scope, args, context);
          const condFn = (0, _customs.getSafeProperty)(math, self.conditionals[i]);
          if (!condFn(evalLhs, evalRhs)) {
            return false;
          }
        }
        return true;
      };
    }

    /**
     * Execute a callback for each of the child nodes of this node
     * @param {function(child: Node, path: string, parent: Node)} callback
     */
    forEach(callback) {
      this.params.forEach((n, i) => callback(n, 'params[' + i + ']', this), this);
    }

    /**
     * Create a new RelationalNode whose children are the results of calling
     * the provided callback function for each child of the original node.
     * @param {function(child: Node, path: string, parent: Node): Node} callback
     * @returns {RelationalNode} Returns a transformed copy of the node
     */
    map(callback) {
      return new RelationalNode(this.conditionals.slice(), this.params.map((n, i) => this._ifNode(callback(n, 'params[' + i + ']', this)), this));
    }

    /**
     * Create a clone of this node, a shallow copy
     * @return {RelationalNode}
     */
    clone() {
      return new RelationalNode(this.conditionals, this.params);
    }

    /**
     * Get string representation.
     * @param {Object} options
     * @return {string} str
     */
    _toString(options) {
      const parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
      const precedence = (0, _operators.getPrecedence)(this, parenthesis, options && options.implicit);
      const paramStrings = this.params.map(function (p, index) {
        const paramPrecedence = (0, _operators.getPrecedence)(p, parenthesis, options && options.implicit);
        return parenthesis === 'all' || paramPrecedence !== null && paramPrecedence <= precedence ? '(' + p.toString(options) + ')' : p.toString(options);
      });
      let ret = paramStrings[0];
      for (let i = 0; i < this.conditionals.length; i++) {
        ret += ' ' + operatorMap[this.conditionals[i]];
        ret += ' ' + paramStrings[i + 1];
      }
      return ret;
    }

    /**
     * Get a JSON representation of the node
     * @returns {Object}
     */
    toJSON() {
      return {
        mathjs: name,
        conditionals: this.conditionals,
        params: this.params
      };
    }

    /**
     * Instantiate a RelationalNode from its JSON representation
     * @param {Object} json
     *     An object structured like
     *     `{"mathjs": "RelationalNode", "conditionals": ..., "params": ...}`,
     *     where mathjs is optional
     * @returns {RelationalNode}
     */
    static fromJSON(json) {
      return new RelationalNode(json.conditionals, json.params);
    }

    /**
     * Get HTML representation
     * @param {Object} options
     * @return {string} str
     */
    _toHTML(options) {
      const parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
      const precedence = (0, _operators.getPrecedence)(this, parenthesis, options && options.implicit);
      const paramStrings = this.params.map(function (p, index) {
        const paramPrecedence = (0, _operators.getPrecedence)(p, parenthesis, options && options.implicit);
        return parenthesis === 'all' || paramPrecedence !== null && paramPrecedence <= precedence ? '<span class="math-parenthesis math-round-parenthesis">(</span>' + p.toHTML(options) + '<span class="math-parenthesis math-round-parenthesis">)</span>' : p.toHTML(options);
      });
      let ret = paramStrings[0];
      for (let i = 0; i < this.conditionals.length; i++) {
        ret += '<span class="math-operator math-binary-operator ' + 'math-explicit-binary-operator">' + (0, _string.escape)(operatorMap[this.conditionals[i]]) + '</span>' + paramStrings[i + 1];
      }
      return ret;
    }

    /**
     * Get LaTeX representation
     * @param {Object} options
     * @return {string} str
     */
    _toTex(options) {
      const parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
      const precedence = (0, _operators.getPrecedence)(this, parenthesis, options && options.implicit);
      const paramStrings = this.params.map(function (p, index) {
        const paramPrecedence = (0, _operators.getPrecedence)(p, parenthesis, options && options.implicit);
        return parenthesis === 'all' || paramPrecedence !== null && paramPrecedence <= precedence ? '\\left(' + p.toTex(options) + '\right)' : p.toTex(options);
      });
      let ret = paramStrings[0];
      for (let i = 0; i < this.conditionals.length; i++) {
        ret += _latex.latexOperators[this.conditionals[i]] + paramStrings[i + 1];
      }
      return ret;
    }
  }
  (0, _defineProperty2.default)(RelationalNode, "name", name);
  return RelationalNode;
}, {
  isClass: true,
  isNode: true
});