antlr.v4.runtime.atn.AtomTransition source code

1 /*
2  * [The "BSD license"]
3  *  Copyright (c) 2016 Terence Parr
4  *  Copyright (c) 2016 Sam Harwell
5  *  All rights reserved.
6  *
7  *  Redistribution and use in source and binary forms, with or without
8  *  modification, are permitted provided that the following conditions
9  *  are met:
10  *
11  *  1. Redistributions of source code must retain the above copyright
12  *     notice, this list of conditions and the following disclaimer.
13  *  2. Redistributions in binary form must reproduce the above copyright
14  *     notice, this list of conditions and the following disclaimer in the
15  *     documentation and/or other materials provided with the distribution.
16  *  3. The name of the author may not be used to endorse or promote products
17  *     derived from this software without specific prior written permission.
18  *
19  *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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24  *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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28  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 module antlr.v4.runtime.atn.AtomTransition;
32 
33 import std.conv;
34 import antlr.v4.runtime.atn.Transition;
35 import antlr.v4.runtime.atn.ATNState;
36 import antlr.v4.runtime.atn.TransitionStates;
37 import antlr.v4.runtime.misc.IntervalSet;
38 
39 // Class AtomTransition
40 /**
41  * TODO add class description
42  */
43 class AtomTransition : Transition
44 {
45 
46     /**
47      * @uml
48      * The token type or character value; or, signifies special label.
49      */
50     public int _label;
51 
52     public this(ATNState target, int label)
53     {
54         super(target);
55         this._label = label;
56     }
57 
58     /**
59      * @uml
60      * @override
61      */
62     public override int getSerializationType()
63     {
64         return TransitionStates.ATOM;
65     }
66 
67     /**
68      * @uml
69      * @override
70      */
71     public override IntervalSet label()
72     {
73         return IntervalSet.of(_label);
74     }
75 
76     /**
77      * @uml
78      * @override
79      */
80     public override bool matches(int symbol, int minVocabSymbol, int maxVocabSymbol)
81     {
82         return _label == symbol;
83     }
84 
85     /**
86      * @uml
87      * @override
88      */
89     public override string toString()
90     {
91         return to!string(_label);
92     }
93 
94 }