81 lines
2.2 KiB
JavaScript
81 lines
2.2 KiB
JavaScript
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/**
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* The MIT License (MIT)
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* Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
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*/
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'use strict';
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/**
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* A generic FA State class (base for NFA and DFA).
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*
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* Maintains the transition map, and the flag whether
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* the state is accepting.
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*/
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var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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var State = function () {
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function State() {
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var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
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_ref$accepting = _ref.accepting,
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accepting = _ref$accepting === undefined ? false : _ref$accepting;
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_classCallCheck(this, State);
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/**
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* Outgoing transitions to other states.
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*/
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this._transitions = new Map();
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/**
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* Whether the state is accepting.
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*/
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this.accepting = accepting;
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}
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/**
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* Returns transitions for this state.
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*/
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_createClass(State, [{
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key: 'getTransitions',
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value: function getTransitions() {
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return this._transitions;
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}
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/**
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* Creates a transition on symbol.
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*/
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}, {
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key: 'addTransition',
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value: function addTransition(symbol, toState) {
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this.getTransitionsOnSymbol(symbol).add(toState);
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return this;
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}
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/**
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* Returns transitions set on symbol.
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*/
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}, {
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key: 'getTransitionsOnSymbol',
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value: function getTransitionsOnSymbol(symbol) {
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var transitions = this._transitions.get(symbol);
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if (!transitions) {
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transitions = new Set();
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this._transitions.set(symbol, transitions);
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}
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return transitions;
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}
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}]);
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return State;
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}();
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module.exports = State;
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