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 /**
19  * TODO add class description
20  */
21 class LexerNoViableAltException : RecognitionException
22 {
23 
24     /**
25      * Matching attempted at what input index?
26      */
27     private int startIndex;
28 
29     /**
30      * Which configurations did we try at input.index() that couldn't match input.LA(1)?
31      */
32     private ATNConfigSet deadEndConfigs;
33 
34     public this(Lexer lexer, CharStream input, int startIndex, ATNConfigSet deadEndConfigs)
35     {
36         super(lexer, input, null);
37         this.startIndex = startIndex;
38         this.deadEndConfigs = deadEndConfigs;
39     }
40 
41     public int getStartIndex()
42     {
43         return startIndex;
44     }
45 
46     public ATNConfigSet getDeadEndConfigs()
47     {
48         return deadEndConfigs;
49     }
50 
51     /**
52      * @uml
53      * @override
54      */
55     public override CharStream getInputStream()
56     {
57         return cast(CharStream)super.getInputStream;
58     }
59 
60     /**
61      * @uml
62      * @override
63      */
64     public override string toString()
65     {
66 	string symbol = "";
67         if (startIndex >= 0 && startIndex < getInputStream().size) {
68             symbol = getInputStream().getText(Interval.of(startIndex,startIndex));
69             symbol = Utils.escapeWhitespace(symbol, false);
70         }
71 
72         return format("%s('%s')", "LexerNoViableAltException", symbol);
73     }
74 
75 }