antlr.v4.runtime.atn.PredicateEvalInfo source code

1 /*
2  * [The "BSD license"]
3  *  Copyright (c) 2014 Terence Parr
4  *  Copyright (c) 2014 Sam Harwell
5  *  All rights reserved.
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7  *  Redistribution and use in source and binary forms, with or without
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12  *     notice, this list of conditions and the following disclaimer.
13  *  2. Redistributions in binary form must reproduce the above copyright
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15  *     documentation and/or other materials provided with the distribution.
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17  *     derived from this software without specific prior written permission.
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30 
31 module antlr.v4.runtime.atn.PredicateEvalInfo;
32 
33 import antlr.v4.runtime.TokenStream;
34 import antlr.v4.runtime.atn.ATNConfigSet;
35 import antlr.v4.runtime.atn.DecisionEventInfo;
36 import antlr.v4.runtime.atn.SemanticContext;
37 
38 // Class PredicateEvalInfo
39 /**
40  * This class represents profiling event information for semantic predicate
41  * evaluations which occur during prediction.
42  *
43  * @see ParserATNSimulator#evalSemanticContext
44  *
45  * @since 4.3
46  */
47 class PredicateEvalInfo : DecisionEventInfo
48 {
49 
50     /**
51      * The semantic context which was evaluated.
52      */
53     public SemanticContext semctx;
54 
55     /**
56      * The alternative number for the decision which is guarded by the semantic
57      * context {@link #semctx}. Note that other ATN
58      * configurations may predict the same alternative which are guarded by
59      * other semantic contexts and/or {@link SemanticContext#NONE}.
60      */
61     public int predictedAlt;
62 
63     /**
64      * The result of evaluating the semantic context {@link #semctx}.
65      */
66     public bool evalResult;
67 
68     /**
69      * Constructs a new instance of the {@link PredicateEvalInfo} class with the
70      * specified detailed predicate evaluation information.
71      *
72      *  @param decision The decision number
73      *  @param input The input token stream
74      *  @param startIndex The start index for the current prediction
75      *  @param stopIndex The index at which the predicate evaluation was
76      * triggered. Note that the input stream may be reset to other positions for
77      * the actual evaluation of individual predicates.
78      *  @param semctx The semantic context which was evaluated
79      *  @param evalResult The results of evaluating the semantic context
80      *  @param predictedAlt The alternative number for the decision which is
81      * guarded by the semantic context {@code semctx}. See {@link #predictedAlt}
82      * for more information.
83      *  @param fullCtx {@code true} if the semantic context was
84      * evaluated during LL prediction; otherwise, {@code false} if the semantic
85      * context was evaluated during SLL prediction
86      *
87      *  @see ParserATNSimulator#evalSemanticContext(SemanticContext, ParserRuleContext, int, boolean)
88      *  @see SemanticContext#eval(Recognizer, RuleContext)
89      */
90     public this(int decision, TokenStream input, int startIndex, int stopIndex, SemanticContext semctx,
91                 bool evalResult, int predictedAlt, bool fullCtx)
92     {
93         super(decision, new ATNConfigSet(), input, startIndex, stopIndex, fullCtx);
94         this.semctx = semctx;
95         this.evalResult = evalResult;
96         this.predictedAlt = predictedAlt;
97     }
98 
99 }