forked from jasder/antlr
135 lines
4.7 KiB
C#
135 lines
4.7 KiB
C#
/*
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* [The "BSD license"]
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* Copyright (c) 2013 Terence Parr
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* Copyright (c) 2013 Sam Harwell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using Antlr4.Runtime.Atn;
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using Antlr4.Runtime.Misc;
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using Sharpen;
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namespace Antlr4.Runtime.Atn
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{
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/// <summary>An ATN transition between any two ATN states.</summary>
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/// <remarks>
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/// An ATN transition between any two ATN states. Subclasses define
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/// atom, set, epsilon, action, predicate, rule transitions.
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/// <p/>
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/// This is a one way link. It emanates from a state (usually via a list of
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/// transitions) and has a target state.
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/// <p/>
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/// Since we never have to change the ATN transitions once we construct it,
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/// we can fix these transitions as specific classes. The DFA transitions
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/// on the other hand need to update the labels as it adds transitions to
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/// the states. We'll use the term Edge for the DFA to distinguish them from
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/// ATN transitions.
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/// </remarks>
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public abstract class Transition
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{
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public const int Epsilon = 1;
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public const int Range = 2;
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public const int Rule = 3;
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public const int Predicate = 4;
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public const int Atom = 5;
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public const int Action = 6;
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public const int Set = 7;
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public const int NotSet = 8;
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public const int Wildcard = 9;
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public const int Precedence = 10;
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public static readonly IList<string> serializationNames = Sharpen.Collections.UnmodifiableList
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(Arrays.AsList("INVALID", "EPSILON", "RANGE", "RULE", "PREDICATE", "ATOM", "ACTION"
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, "SET", "NOT_SET", "WILDCARD", "PRECEDENCE"));
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private sealed class _Dictionary_86 : Dictionary<Type, int>
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{
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public _Dictionary_86()
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{
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{
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// constants for serialization
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// e.g., {isType(input.LT(1))}?
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// ~(A|B) or ~atom, wildcard, which convert to next 2
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this.Put(typeof(EpsilonTransition), Antlr4.Runtime.Atn.Transition.Epsilon);
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this.Put(typeof(RangeTransition), Antlr4.Runtime.Atn.Transition.Range);
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this.Put(typeof(RuleTransition), Antlr4.Runtime.Atn.Transition.Rule);
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this.Put(typeof(PredicateTransition), Antlr4.Runtime.Atn.Transition.Predicate);
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this.Put(typeof(AtomTransition), Antlr4.Runtime.Atn.Transition.Atom);
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this.Put(typeof(ActionTransition), Antlr4.Runtime.Atn.Transition.Action);
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this.Put(typeof(SetTransition), Antlr4.Runtime.Atn.Transition.Set);
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this.Put(typeof(NotSetTransition), Antlr4.Runtime.Atn.Transition.NotSet);
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this.Put(typeof(WildcardTransition), Antlr4.Runtime.Atn.Transition.Wildcard);
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this.Put(typeof(PrecedencePredicateTransition), Antlr4.Runtime.Atn.Transition.Precedence
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);
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}
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}
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}
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public static readonly IDictionary<Type, int> serializationTypes = Sharpen.Collections
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.UnmodifiableMap(new _Dictionary_86());
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/// <summary>The target of this transition.</summary>
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/// <remarks>The target of this transition.</remarks>
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[NotNull]
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public ATNState target;
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protected internal Transition(ATNState target)
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{
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if (target == null)
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{
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throw new ArgumentNullException("target cannot be null.");
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}
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this.target = target;
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}
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public abstract int GetSerializationType();
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/// <summary>Are we epsilon, action, sempred?</summary>
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public virtual bool IsEpsilon()
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{
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return false;
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}
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[Nullable]
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public virtual IntervalSet Label()
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{
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return null;
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}
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public abstract bool Matches(int symbol, int minVocabSymbol, int maxVocabSymbol);
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}
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}
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