86 lines
4.0 KiB
JavaScript
86 lines
4.0 KiB
JavaScript
"use strict";
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/*!
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* Copyright 2016 The ANTLR Project. All rights reserved.
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* Licensed under the BSD-3-Clause license. See LICENSE file in the project root for license information.
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*/
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var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
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var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
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if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
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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;
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return c > 3 && r && Object.defineProperty(target, key, r), r;
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};
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var __param = (this && this.__param) || function (paramIndex, decorator) {
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return function (target, key) { decorator(target, key, paramIndex); }
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.AmbiguityInfo = void 0;
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const DecisionEventInfo_1 = require("./DecisionEventInfo");
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const Decorators_1 = require("../Decorators");
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/**
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* This class represents profiling event information for an ambiguity.
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* Ambiguities are decisions where a particular input resulted in an SLL
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* conflict, followed by LL prediction also reaching a conflict state
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* (indicating a true ambiguity in the grammar).
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*
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* This event may be reported during SLL prediction in cases where the
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* conflicting SLL configuration set provides sufficient information to
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* determine that the SLL conflict is truly an ambiguity. For example, if none
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* of the ATN configurations in the conflicting SLL configuration set have
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* traversed a global follow transition (i.e.
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* {@link ATNConfig#getReachesIntoOuterContext} is `false` for all
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* configurations), then the result of SLL prediction for that input is known to
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* be equivalent to the result of LL prediction for that input.
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*
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* In some cases, the minimum represented alternative in the conflicting LL
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* configuration set is not equal to the minimum represented alternative in the
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* conflicting SLL configuration set. Grammars and inputs which result in this
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* scenario are unable to use {@link PredictionMode#SLL}, which in turn means
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* they cannot use the two-stage parsing strategy to improve parsing performance
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* for that input.
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*
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* @see ParserATNSimulator#reportAmbiguity
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* @see ParserErrorListener#reportAmbiguity
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*
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* @since 4.3
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*/
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let AmbiguityInfo = class AmbiguityInfo extends DecisionEventInfo_1.DecisionEventInfo {
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/**
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* Constructs a new instance of the {@link AmbiguityInfo} class with the
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* specified detailed ambiguity information.
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*
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* @param decision The decision number
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* @param state The final simulator state identifying the ambiguous
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* alternatives for the current input
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* @param ambigAlts The set of alternatives in the decision that lead to a valid parse.
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* The predicted alt is the min(ambigAlts)
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* @param input The input token stream
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* @param startIndex The start index for the current prediction
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* @param stopIndex The index at which the ambiguity was identified during
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* prediction
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*/
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constructor(decision, state, ambigAlts, input, startIndex, stopIndex) {
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super(decision, state, input, startIndex, stopIndex, state.useContext);
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this.ambigAlts = ambigAlts;
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}
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/**
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* Gets the set of alternatives in the decision that lead to a valid parse.
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*
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* @since 4.5
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*/
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get ambiguousAlternatives() {
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return this.ambigAlts;
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}
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};
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__decorate([
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Decorators_1.NotNull
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], AmbiguityInfo.prototype, "ambigAlts", void 0);
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__decorate([
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Decorators_1.NotNull
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], AmbiguityInfo.prototype, "ambiguousAlternatives", null);
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AmbiguityInfo = __decorate([
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__param(1, Decorators_1.NotNull),
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__param(2, Decorators_1.NotNull),
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__param(3, Decorators_1.NotNull)
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], AmbiguityInfo);
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exports.AmbiguityInfo = AmbiguityInfo;
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//# sourceMappingURL=AmbiguityInfo.js.map
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