225 lines
9.4 KiB
JavaScript
225 lines
9.4 KiB
JavaScript
import _defineProperty from "@babel/runtime/helpers/defineProperty";
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import { isBigNumber, isComplex, isNode, isUnit, typeOf } from '../../utils/is.js';
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import { factory } from '../../utils/factory.js';
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import { getPrecedence } from '../operators.js';
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var name = 'ConditionalNode';
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var dependencies = ['Node'];
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export var createConditionalNode = /* #__PURE__ */factory(name, dependencies, _ref => {
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var {
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Node
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} = _ref;
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/**
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* Test whether a condition is met
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* @param {*} condition
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* @returns {boolean} true if condition is true or non-zero, else false
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*/
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function testCondition(condition) {
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if (typeof condition === 'number' || typeof condition === 'boolean' || typeof condition === 'string') {
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return !!condition;
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}
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if (condition) {
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if (isBigNumber(condition)) {
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return !condition.isZero();
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}
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if (isComplex(condition)) {
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return !!(condition.re || condition.im);
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}
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if (isUnit(condition)) {
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return !!condition.value;
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}
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}
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if (condition === null || condition === undefined) {
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return false;
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}
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throw new TypeError('Unsupported type of condition "' + typeOf(condition) + '"');
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}
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class ConditionalNode extends Node {
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/**
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* A lazy evaluating conditional operator: 'condition ? trueExpr : falseExpr'
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*
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* @param {Node} condition Condition, must result in a boolean
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* @param {Node} trueExpr Expression evaluated when condition is true
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* @param {Node} falseExpr Expression evaluated when condition is true
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*
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* @constructor ConditionalNode
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* @extends {Node}
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*/
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constructor(condition, trueExpr, falseExpr) {
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super();
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if (!isNode(condition)) {
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throw new TypeError('Parameter condition must be a Node');
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}
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if (!isNode(trueExpr)) {
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throw new TypeError('Parameter trueExpr must be a Node');
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}
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if (!isNode(falseExpr)) {
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throw new TypeError('Parameter falseExpr must be a Node');
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}
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this.condition = condition;
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this.trueExpr = trueExpr;
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this.falseExpr = falseExpr;
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}
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get type() {
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return name;
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}
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get isConditionalNode() {
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return true;
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}
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/**
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* Compile a node into a JavaScript function.
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* This basically pre-calculates as much as possible and only leaves open
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* calculations which depend on a dynamic scope with variables.
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* @param {Object} math Math.js namespace with functions and constants.
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* @param {Object} argNames An object with argument names as key and `true`
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* as value. Used in the SymbolNode to optimize
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* for arguments from user assigned functions
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* (see FunctionAssignmentNode) or special symbols
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* like `end` (see IndexNode).
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* @return {function} Returns a function which can be called like:
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* evalNode(scope: Object, args: Object, context: *)
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*/
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_compile(math, argNames) {
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var evalCondition = this.condition._compile(math, argNames);
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var evalTrueExpr = this.trueExpr._compile(math, argNames);
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var evalFalseExpr = this.falseExpr._compile(math, argNames);
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return function evalConditionalNode(scope, args, context) {
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return testCondition(evalCondition(scope, args, context)) ? evalTrueExpr(scope, args, context) : evalFalseExpr(scope, args, context);
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};
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}
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/**
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* Execute a callback for each of the child nodes of this node
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* @param {function(child: Node, path: string, parent: Node)} callback
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*/
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forEach(callback) {
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callback(this.condition, 'condition', this);
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callback(this.trueExpr, 'trueExpr', this);
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callback(this.falseExpr, 'falseExpr', this);
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}
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/**
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* Create a new ConditionalNode whose children are the results of calling
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* the provided callback function for each child of the original node.
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* @param {function(child: Node, path: string, parent: Node): Node} callback
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* @returns {ConditionalNode} Returns a transformed copy of the node
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*/
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map(callback) {
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return new ConditionalNode(this._ifNode(callback(this.condition, 'condition', this)), this._ifNode(callback(this.trueExpr, 'trueExpr', this)), this._ifNode(callback(this.falseExpr, 'falseExpr', this)));
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}
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/**
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* Create a clone of this node, a shallow copy
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* @return {ConditionalNode}
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*/
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clone() {
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return new ConditionalNode(this.condition, this.trueExpr, this.falseExpr);
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}
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/**
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* Get string representation
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* @param {Object} options
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* @return {string} str
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*/
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_toString(options) {
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var parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
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var precedence = getPrecedence(this, parenthesis, options && options.implicit);
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// Enclose Arguments in parentheses if they are an OperatorNode
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// or have lower or equal precedence
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// NOTE: enclosing all OperatorNodes in parentheses is a decision
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// purely based on aesthetics and readability
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var condition = this.condition.toString(options);
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var conditionPrecedence = getPrecedence(this.condition, parenthesis, options && options.implicit);
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if (parenthesis === 'all' || this.condition.type === 'OperatorNode' || conditionPrecedence !== null && conditionPrecedence <= precedence) {
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condition = '(' + condition + ')';
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}
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var trueExpr = this.trueExpr.toString(options);
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var truePrecedence = getPrecedence(this.trueExpr, parenthesis, options && options.implicit);
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if (parenthesis === 'all' || this.trueExpr.type === 'OperatorNode' || truePrecedence !== null && truePrecedence <= precedence) {
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trueExpr = '(' + trueExpr + ')';
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}
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var falseExpr = this.falseExpr.toString(options);
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var falsePrecedence = getPrecedence(this.falseExpr, parenthesis, options && options.implicit);
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if (parenthesis === 'all' || this.falseExpr.type === 'OperatorNode' || falsePrecedence !== null && falsePrecedence <= precedence) {
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falseExpr = '(' + falseExpr + ')';
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}
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return condition + ' ? ' + trueExpr + ' : ' + falseExpr;
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}
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/**
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* Get a JSON representation of the node
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* @returns {Object}
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*/
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toJSON() {
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return {
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mathjs: name,
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condition: this.condition,
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trueExpr: this.trueExpr,
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falseExpr: this.falseExpr
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};
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}
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/**
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* Instantiate an ConditionalNode from its JSON representation
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* @param {Object} json
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* An object structured like
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* ```
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* {"mathjs": "ConditionalNode",
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* "condition": ...,
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* "trueExpr": ...,
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* "falseExpr": ...}
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* ```
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* where mathjs is optional
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* @returns {ConditionalNode}
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*/
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static fromJSON(json) {
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return new ConditionalNode(json.condition, json.trueExpr, json.falseExpr);
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}
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/**
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* Get HTML representation
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* @param {Object} options
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* @return {string} str
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*/
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_toHTML(options) {
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var parenthesis = options && options.parenthesis ? options.parenthesis : 'keep';
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var precedence = getPrecedence(this, parenthesis, options && options.implicit);
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// Enclose Arguments in parentheses if they are an OperatorNode
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// or have lower or equal precedence
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// NOTE: enclosing all OperatorNodes in parentheses is a decision
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// purely based on aesthetics and readability
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var condition = this.condition.toHTML(options);
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var conditionPrecedence = getPrecedence(this.condition, parenthesis, options && options.implicit);
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if (parenthesis === 'all' || this.condition.type === 'OperatorNode' || conditionPrecedence !== null && conditionPrecedence <= precedence) {
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condition = '<span class="math-parenthesis math-round-parenthesis">(</span>' + condition + '<span class="math-parenthesis math-round-parenthesis">)</span>';
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}
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var trueExpr = this.trueExpr.toHTML(options);
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var truePrecedence = getPrecedence(this.trueExpr, parenthesis, options && options.implicit);
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if (parenthesis === 'all' || this.trueExpr.type === 'OperatorNode' || truePrecedence !== null && truePrecedence <= precedence) {
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trueExpr = '<span class="math-parenthesis math-round-parenthesis">(</span>' + trueExpr + '<span class="math-parenthesis math-round-parenthesis">)</span>';
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}
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var falseExpr = this.falseExpr.toHTML(options);
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var falsePrecedence = getPrecedence(this.falseExpr, parenthesis, options && options.implicit);
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if (parenthesis === 'all' || this.falseExpr.type === 'OperatorNode' || falsePrecedence !== null && falsePrecedence <= precedence) {
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falseExpr = '<span class="math-parenthesis math-round-parenthesis">(</span>' + falseExpr + '<span class="math-parenthesis math-round-parenthesis">)</span>';
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}
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return condition + '<span class="math-operator math-conditional-operator">?</span>' + trueExpr + '<span class="math-operator math-conditional-operator">:</span>' + falseExpr;
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}
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/**
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* Get LaTeX representation
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* @param {Object} options
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* @return {string} str
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*/
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_toTex(options) {
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return '\\begin{cases} {' + this.trueExpr.toTex(options) + '}, &\\quad{\\text{if }\\;' + this.condition.toTex(options) + '}\\\\{' + this.falseExpr.toTex(options) + '}, &\\quad{\\text{otherwise}}\\end{cases}';
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}
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}
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_defineProperty(ConditionalNode, "name", name);
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return ConditionalNode;
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}, {
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isClass: true,
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isNode: true
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}); |