jiangchengfeiyi-xiaochengxu/node_modules/mathjs/lib/esm/expression/node/ConstantNode.js

import _defineProperty from "@babel/runtime/helpers/defineProperty";
import { format } from '../../utils/string.js';
import { typeOf } from '../../utils/is.js';
import { escapeLatex } from '../../utils/latex.js';
import { factory } from '../../utils/factory.js';
var name = 'ConstantNode';
var dependencies = ['Node'];
export var createConstantNode = /* #__PURE__ */factory(name, dependencies, _ref => {
  var {
    Node
  } = _ref;
  class ConstantNode extends Node {
    /**
     * A ConstantNode holds a constant value like a number or string.
     *
     * Usage:
     *
     *     new ConstantNode(2.3)
     *     new ConstantNode('hello')
     *
     * @param {*} value    Value can be any type (number, BigNumber, bigint, string, ...)
     * @constructor ConstantNode
     * @extends {Node}
     */
    constructor(value) {
      super();
      this.value = value;
    }
    get type() {
      return name;
    }
    get isConstantNode() {
      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) {
      var value = this.value;
      return function evalConstantNode() {
        return value;
      };
    }

    /**
     * Execute a callback for each of the child nodes of this node
     * @param {function(child: Node, path: string, parent: Node)} callback
     */
    forEach(callback) {
      // nothing to do, we don't have any children
    }

    /**
     * Create a new ConstantNode with children produced by the given callback.
     * Trivial because there are no children.
     * @param {function(child: Node, path: string, parent: Node) : Node} callback
     * @returns {ConstantNode} Returns a clone of the node
     */
    map(callback) {
      return this.clone();
    }

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

    /**
     * Get string representation
     * @param {Object} options
     * @return {string} str
     */
    _toString(options) {
      return format(this.value, options);
    }

    /**
     * Get HTML representation
     * @param {Object} options
     * @return {string} str
     */
    _toHTML(options) {
      var value = this._toString(options);
      switch (typeOf(this.value)) {
        case 'number':
        case 'bigint':
        case 'BigNumber':
        case 'Fraction':
          return '<span class="math-number">' + value + '</span>';
        case 'string':
          return '<span class="math-string">' + value + '</span>';
        case 'boolean':
          return '<span class="math-boolean">' + value + '</span>';
        case 'null':
          return '<span class="math-null-symbol">' + value + '</span>';
        case 'undefined':
          return '<span class="math-undefined">' + value + '</span>';
        default:
          return '<span class="math-symbol">' + value + '</span>';
      }
    }

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

    /**
     * Instantiate a ConstantNode from its JSON representation
     * @param {Object} json  An object structured like
     *                       `{"mathjs": "SymbolNode", value: 2.3}`,
     *                       where mathjs is optional
     * @returns {ConstantNode}
     */
    static fromJSON(json) {
      return new ConstantNode(json.value);
    }

    /**
     * Get LaTeX representation
     * @param {Object} options
     * @return {string} str
     */
    _toTex(options) {
      var value = this._toString(options);
      var type = typeOf(this.value);
      switch (type) {
        case 'string':
          return '\\mathtt{' + escapeLatex(value) + '}';
        case 'number':
        case 'BigNumber':
          {
            var finite = type === 'BigNumber' ? this.value.isFinite() : isFinite(this.value);
            if (!finite) {
              return this.value.valueOf() < 0 ? '-\\infty' : '\\infty';
            }
            var index = value.toLowerCase().indexOf('e');
            if (index !== -1) {
              return value.substring(0, index) + '\\cdot10^{' + value.substring(index + 1) + '}';
            }
            return value;
          }
        case 'bigint':
          {
            return value.toString();
          }
        case 'Fraction':
          return this.value.toLatex();
        default:
          return value;
      }
    }
  }
  _defineProperty(ConstantNode, "name", name);
  return ConstantNode;
}, {
  isClass: true,
  isNode: true
});