antlr4ts
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ANTLR 4 runtime for JavaScript written in Typescript
86 lines • 4.13 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.AmbiguityInfo = void 0;
const DecisionEventInfo_1 = require("./DecisionEventInfo");
const Decorators_1 = require("../Decorators");
/**
* This class represents profiling event information for an ambiguity.
* Ambiguities are decisions where a particular input resulted in an SLL
* conflict, followed by LL prediction also reaching a conflict state
* (indicating a true ambiguity in the grammar).
*
* This event may be reported during SLL prediction in cases where the
* conflicting SLL configuration set provides sufficient information to
* determine that the SLL conflict is truly an ambiguity. For example, if none
* of the ATN configurations in the conflicting SLL configuration set have
* traversed a global follow transition (i.e.
* {@link ATNConfig#getReachesIntoOuterContext} is `false` for all
* configurations), then the result of SLL prediction for that input is known to
* be equivalent to the result of LL prediction for that input.
*
* In some cases, the minimum represented alternative in the conflicting LL
* configuration set is not equal to the minimum represented alternative in the
* conflicting SLL configuration set. Grammars and inputs which result in this
* scenario are unable to use {@link PredictionMode#SLL}, which in turn means
* they cannot use the two-stage parsing strategy to improve parsing performance
* for that input.
*
* @see ParserATNSimulator#reportAmbiguity
* @see ParserErrorListener#reportAmbiguity
*
* @since 4.3
*/
let AmbiguityInfo = class AmbiguityInfo extends DecisionEventInfo_1.DecisionEventInfo {
/**
* Constructs a new instance of the {@link AmbiguityInfo} class with the
* specified detailed ambiguity information.
*
* @param decision The decision number
* @param state The final simulator state identifying the ambiguous
* alternatives for the current input
* @param ambigAlts The set of alternatives in the decision that lead to a valid parse.
* The predicted alt is the min(ambigAlts)
* @param input The input token stream
* @param startIndex The start index for the current prediction
* @param stopIndex The index at which the ambiguity was identified during
* prediction
*/
constructor(decision, state, ambigAlts, input, startIndex, stopIndex) {
super(decision, state, input, startIndex, stopIndex, state.useContext);
this.ambigAlts = ambigAlts;
}
/**
* Gets the set of alternatives in the decision that lead to a valid parse.
*
* @since 4.5
*/
get ambiguousAlternatives() {
return this.ambigAlts;
}
};
__decorate([
Decorators_1.NotNull
], AmbiguityInfo.prototype, "ambigAlts", void 0);
__decorate([
Decorators_1.NotNull
], AmbiguityInfo.prototype, "ambiguousAlternatives", null);
AmbiguityInfo = __decorate([
__param(1, Decorators_1.NotNull),
__param(2, Decorators_1.NotNull),
__param(3, Decorators_1.NotNull)
], AmbiguityInfo);
exports.AmbiguityInfo = AmbiguityInfo;
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