ysjj-system/node_modules/mathjs/lib/esm/expression/node/ConditionalNode.js

import _defineProperty from "@babel/runtime/helpers/defineProperty";
import { isBigNumber, isComplex, isNode, isUnit, typeOf } from '../../utils/is.js';
import { factory } from '../../utils/factory.js';
import { getPrecedence } from '../operators.js';
var name = 'ConditionalNode';
var dependencies = ['Node'];
export var createConditionalNode = /* #__PURE__ */factory(name, dependencies, _ref => {
  var {
    Node
  } = _ref;
  /**
   * Test whether a condition is met
   * @param {*} condition
   * @returns {boolean} true if condition is true or non-zero, else false
   */
  function testCondition(condition) {
    if (typeof condition === 'number' || typeof condition === 'boolean' || typeof condition === 'string') {
      return !!condition;
    }
    if (condition) {
      if (isBigNumber(condition)) {
        return !condition.isZero();
      }
      if (isComplex(condition)) {
        return !!(condition.re || condition.im);
      }
      if (isUnit(condition)) {
        return !!condition.value;
      }
    }
    if (condition === null || condition === undefined) {
      return false;
    }
    throw new TypeError('Unsupported type of condition "' + typeOf(condition) + '"');
  }
  class ConditionalNode extends Node {
    /**
     * A lazy evaluating conditional operator: 'condition ? trueExpr : falseExpr'
     *
     * @param {Node} condition   Condition, must result in a boolean
     * @param {Node} trueExpr    Expression evaluated when condition is true
     * @param {Node} falseExpr   Expression evaluated when condition is true
     *
     * @constructor ConditionalNode
     * @extends {Node}
     */
    constructor(condition, trueExpr, falseExpr) {
      super();
      if (!isNode(condition)) {
        throw new TypeError('Parameter condition must be a Node');
      }
      if (!isNode(trueExpr)) {
        throw new TypeError('Parameter trueExpr must be a Node');
      }
      if (!isNode(falseExpr)) {
        throw new TypeError('Parameter falseExpr must be a Node');
      }
      this.condition = condition;
      this.trueExpr = trueExpr;
      this.falseExpr = falseExpr;
    }
    get type() {
      return name;
    }
    get isConditionalNode() {
      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 evalCondition = this.condition._compile(math, argNames);
      var evalTrueExpr = this.trueExpr._compile(math, argNames);
      var evalFalseExpr = this.falseExpr._compile(math, argNames);
      return function evalConditionalNode(scope, args, context) {
        return testCondition(evalCondition(scope, args, context)) ? evalTrueExpr(scope, args, context) : evalFalseExpr(scope, args, context);
      };
    }

    /**
     * Execute a callback for each of the child nodes of this node
     * @param {function(child: Node, path: string, parent: Node)} callback
     */
    forEach(callback) {
      callback(this.condition, 'condition', this);
      callback(this.trueExpr, 'trueExpr', this);
      callback(this.falseExpr, 'falseExpr', this);
    }

    /**
     * Create a new ConditionalNode 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 {ConditionalNode} Returns a transformed copy of the node
     */
    map(callback) {
      return new ConditionalNode(this._ifNode(callback(this.condition, 'condition', this)), this._ifNode(callback(this.trueExpr, 'trueExpr', this)), this._ifNode(callback(this.falseExpr, 'falseExpr', this)));
    }

    /**
     * Create a clone of this node, a shallow copy
     * @return {ConditionalNode}
     */
    clone() {
      return new ConditionalNode(this.condition, this.trueExpr, this.falseExpr);
    }

    /**
     * Get string representation
     * @param {Object} options
     * @return {string} str
     */
    _toString(options) {
      var parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
      var precedence = getPrecedence(this, parenthesis, options && options.implicit);

      // Enclose Arguments in parentheses if they are an OperatorNode
      // or have lower or equal precedence
      // NOTE: enclosing all OperatorNodes in parentheses is a decision
      // purely based on aesthetics and readability
      var condition = this.condition.toString(options);
      var conditionPrecedence = getPrecedence(this.condition, parenthesis, options && options.implicit);
      if (parenthesis === 'all' || this.condition.type === 'OperatorNode' || conditionPrecedence !== null && conditionPrecedence <= precedence) {
        condition = '(' + condition + ')';
      }
      var trueExpr = this.trueExpr.toString(options);
      var truePrecedence = getPrecedence(this.trueExpr, parenthesis, options && options.implicit);
      if (parenthesis === 'all' || this.trueExpr.type === 'OperatorNode' || truePrecedence !== null && truePrecedence <= precedence) {
        trueExpr = '(' + trueExpr + ')';
      }
      var falseExpr = this.falseExpr.toString(options);
      var falsePrecedence = getPrecedence(this.falseExpr, parenthesis, options && options.implicit);
      if (parenthesis === 'all' || this.falseExpr.type === 'OperatorNode' || falsePrecedence !== null && falsePrecedence <= precedence) {
        falseExpr = '(' + falseExpr + ')';
      }
      return condition + ' ? ' + trueExpr + ' : ' + falseExpr;
    }

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

    /**
     * Instantiate an ConditionalNode from its JSON representation
     * @param {Object} json
     *     An object structured like
     *     ```
     *     {"mathjs": "ConditionalNode",
     *      "condition": ...,
     *      "trueExpr": ...,
     *      "falseExpr": ...}
     *     ```
     *     where mathjs is optional
     * @returns {ConditionalNode}
     */
    static fromJSON(json) {
      return new ConditionalNode(json.condition, json.trueExpr, json.falseExpr);
    }

    /**
     * Get HTML representation
     * @param {Object} options
     * @return {string} str
     */
    toHTML(options) {
      var parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
      var precedence = getPrecedence(this, parenthesis, options && options.implicit);

      // Enclose Arguments in parentheses if they are an OperatorNode
      // or have lower or equal precedence
      // NOTE: enclosing all OperatorNodes in parentheses is a decision
      // purely based on aesthetics and readability
      var condition = this.condition.toHTML(options);
      var conditionPrecedence = getPrecedence(this.condition, parenthesis, options && options.implicit);
      if (parenthesis === 'all' || this.condition.type === 'OperatorNode' || conditionPrecedence !== null && conditionPrecedence <= precedence) {
        condition = '<span class="math-parenthesis math-round-parenthesis">(</span>' + condition + '<span class="math-parenthesis math-round-parenthesis">)</span>';
      }
      var trueExpr = this.trueExpr.toHTML(options);
      var truePrecedence = getPrecedence(this.trueExpr, parenthesis, options && options.implicit);
      if (parenthesis === 'all' || this.trueExpr.type === 'OperatorNode' || truePrecedence !== null && truePrecedence <= precedence) {
        trueExpr = '<span class="math-parenthesis math-round-parenthesis">(</span>' + trueExpr + '<span class="math-parenthesis math-round-parenthesis">)</span>';
      }
      var falseExpr = this.falseExpr.toHTML(options);
      var falsePrecedence = getPrecedence(this.falseExpr, parenthesis, options && options.implicit);
      if (parenthesis === 'all' || this.falseExpr.type === 'OperatorNode' || falsePrecedence !== null && falsePrecedence <= precedence) {
        falseExpr = '<span class="math-parenthesis math-round-parenthesis">(</span>' + falseExpr + '<span class="math-parenthesis math-round-parenthesis">)</span>';
      }
      return condition + '<span class="math-operator math-conditional-operator">?</span>' + trueExpr + '<span class="math-operator math-conditional-operator">:</span>' + falseExpr;
    }

    /**
     * Get LaTeX representation
     * @param {Object} options
     * @return {string} str
     */
    _toTex(options) {
      return '\\begin{cases} {' + this.trueExpr.toTex(options) + '}, &\\quad{\\text{if }\\;' + this.condition.toTex(options) + '}\\\\{' + this.falseExpr.toTex(options) + '}, &\\quad{\\text{otherwise}}\\end{cases}';
    }
  }
  _defineProperty(ConditionalNode, "name", name);
  return ConditionalNode;
}, {
  isClass: true,
  isNode: true
});