109 lines
3.8 KiB
JavaScript
109 lines
3.8 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.makeTransition = makeTransition;
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exports.FSM = void 0;
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function _sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
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function _slicedToArray(arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return _sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }
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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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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); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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var STOP = Symbol("STOP");
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function makeTransition(regex, nextState) {
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var _ref = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
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_ref$n = _ref.n,
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n = _ref$n === void 0 ? 1 : _ref$n,
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allowedSeparator = _ref.allowedSeparator;
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return function (instance) {
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if (allowedSeparator) {
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if (instance.input[instance.ptr] === allowedSeparator) {
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if (regex.test(instance.input.substring(instance.ptr - 1, instance.ptr))) {
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// Consume the separator and stay in current state
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return [instance.currentState, 1];
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} else {
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return [instance.terminatingState, 0];
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}
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}
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}
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if (regex.test(instance.input.substring(instance.ptr, instance.ptr + n))) {
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return [nextState, n];
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}
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return false;
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};
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}
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function combineTransitions(transitions) {
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return function () {
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var match = false;
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var currentTransitions = transitions[this.currentState] || [];
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for (var i = 0; i < currentTransitions.length; ++i) {
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match = currentTransitions[i](this);
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if (match !== false) {
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break;
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}
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}
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return match || [this.terminatingState, 0];
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};
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}
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var FSM =
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/*#__PURE__*/
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function () {
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function FSM(transitions, initialState) {
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var terminatingState = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : STOP;
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_classCallCheck(this, FSM);
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this.initialState = initialState;
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this.terminatingState = terminatingState;
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if (terminatingState === STOP || !transitions[terminatingState]) {
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transitions[terminatingState] = [];
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}
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this.transitionFunction = combineTransitions.call(this, transitions);
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}
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_createClass(FSM, [{
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key: "run",
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value: function run(input) {
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this.input = input;
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this.ptr = 0;
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this.currentState = this.initialState;
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var value = "";
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var eatLength, nextState;
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while (this.currentState !== this.terminatingState && this.ptr < this.input.length) {
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var _transitionFunction = this.transitionFunction();
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var _transitionFunction2 = _slicedToArray(_transitionFunction, 2);
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nextState = _transitionFunction2[0];
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eatLength = _transitionFunction2[1];
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value += this.input.substring(this.ptr, this.ptr += eatLength);
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this.currentState = nextState;
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}
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return value;
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}
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}]);
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return FSM;
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}();
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exports.FSM = FSM; |