antlr4ts
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ANTLR 4 runtime for JavaScript written in Typescript
73 lines • 2.77 kB
JavaScript
;
/*!
* Copyright 2016 The ANTLR Project. All rights reserved.
* Licensed under the BSD-3-Clause license. See LICENSE file in the project root for license information.
*/
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __param = (this && this.__param) || function (paramIndex, decorator) {
return function (target, key) { decorator(target, key, paramIndex); }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Transition = void 0;
const Decorators_1 = require("../Decorators");
/** An ATN transition between any two ATN states. Subclasses define
* atom, set, epsilon, action, predicate, rule transitions.
*
* This is a one way link. It emanates from a state (usually via a list of
* transitions) and has a target state.
*
* Since we never have to change the ATN transitions once we construct it,
* we can fix these transitions as specific classes. The DFA transitions
* on the other hand need to update the labels as it adds transitions to
* the states. We'll use the term Edge for the DFA to distinguish them from
* ATN transitions.
*/
let Transition = class Transition {
constructor(target) {
if (target == null) {
throw new Error("target cannot be null.");
}
this.target = target;
}
/**
* Determines if the transition is an "epsilon" transition.
*
* The default implementation returns `false`.
*
* @returns `true` if traversing this transition in the ATN does not
* consume an input symbol; otherwise, `false` if traversing this
* transition consumes (matches) an input symbol.
*/
get isEpsilon() {
return false;
}
get label() {
return undefined;
}
};
Transition.serializationNames = [
"INVALID",
"EPSILON",
"RANGE",
"RULE",
"PREDICATE",
"ATOM",
"ACTION",
"SET",
"NOT_SET",
"WILDCARD",
"PRECEDENCE",
];
__decorate([
Decorators_1.NotNull
], Transition.prototype, "target", void 0);
Transition = __decorate([
__param(0, Decorators_1.NotNull)
], Transition);
exports.Transition = Transition;
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