antlr.v4.runtime.LexerNoViableAltException source code

1 /*
2  * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
3  * Use of this file is governed by the BSD 3-clause license that
4  * can be found in the LICENSE.txt file in the project root.
5  */
6 
7 module antlr.v4.runtime.LexerNoViableAltException;
8 
9 import antlr.v4.runtime.CharStream;
10 import antlr.v4.runtime.Lexer;
11 import antlr.v4.runtime.RecognitionException;
12 import antlr.v4.runtime.atn.ATNConfigSet;
13 import antlr.v4.runtime.atn.LexerATNSimulator;
14 import antlr.v4.runtime.misc.Interval;
15 import antlr.v4.runtime.misc.Utils;
16 import std.format;
17 
18 // Class LexerNoViableAltException
19 /**
20  * TODO add class description
21  */
22 class LexerNoViableAltException : RecognitionException
23 {
24 
25     /**
26      * Matching attempted at what input index?
27      */
28     private int startIndex;
29 
30     /**
31      * Which configurations did we try at input.index() that couldn't match input.LA(1)?
32      */
33     private ATNConfigSet deadEndConfigs;
34 
35     public this(Lexer lexer, CharStream input, int startIndex, ATNConfigSet deadEndConfigs)
36     {
37         super(lexer, input, null);
38         this.startIndex = startIndex;
39         this.deadEndConfigs = deadEndConfigs;
40     }
41 
42     public int getStartIndex()
43     {
44         return startIndex;
45     }
46 
47     public ATNConfigSet getDeadEndConfigs()
48     {
49         return deadEndConfigs;
50     }
51 
52     /**
53      * @uml
54      * @override
55      */
56     public override CharStream getInputStream()
57     {
58         return cast(CharStream)super.getInputStream;
59     }
60 
61     /**
62      * @uml
63      * @override
64      */
65     public override string toString()
66     {
67 	string symbol = "";
68         if (startIndex >= 0 && startIndex < getInputStream().size) {
69             symbol = getInputStream().getText(Interval.of(startIndex,startIndex));
70             symbol = Utils.escapeWhitespace(symbol, false);
71         }
72 
73         return format("%s('%s')", "LexerNoViableAltException", symbol);
74     }
75 
76 }