1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* [The "BSD licence"]
* Copyright (c) 2005-2011 Terence Parr
* All rights reserved.
*
* Conversion to C#:
* Copyright (c) 2008-2011 Sam Harwell, Pixel Mine, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Antlr.Runtime
{
using ConditionalAttribute = System.Diagnostics.ConditionalAttribute;
/** <summary>
* A parser for TokenStreams. "parser grammars" result in a subclass
* of this.
* </summary>
*/
public class Parser : BaseRecognizer
{
public ITokenStream input;
public Parser( ITokenStream input )
: base()
{
//super(); // highlight that we go to super to set state object
TokenStream = input;
}
public Parser( ITokenStream input, RecognizerSharedState state )
: base(state) // share the state object with another parser
{
this.input = input;
}
public override void Reset()
{
base.Reset(); // reset all recognizer state variables
if ( input != null )
{
input.Seek( 0 ); // rewind the input
}
}
protected override object GetCurrentInputSymbol( IIntStream input )
{
return ( (ITokenStream)input ).LT( 1 );
}
protected override object GetMissingSymbol( IIntStream input,
RecognitionException e,
int expectedTokenType,
BitSet follow )
{
string tokenText = null;
if ( expectedTokenType == TokenTypes.EndOfFile )
tokenText = "<missing EOF>";
else
tokenText = "<missing " + TokenNames[expectedTokenType] + ">";
CommonToken t = new CommonToken( expectedTokenType, tokenText );
IToken current = ( (ITokenStream)input ).LT( 1 );
if ( current.Type == TokenTypes.EndOfFile )
{
current = ( (ITokenStream)input ).LT( -1 );
}
t.Line = current.Line;
t.CharPositionInLine = current.CharPositionInLine;
t.Channel = DefaultTokenChannel;
t.InputStream = current.InputStream;
return t;
}
/** <summary>Gets or sets the token stream; resets the parser upon a set.</summary> */
public virtual ITokenStream TokenStream
{
get
{
return input;
}
set
{
input = null;
Reset();
input = value;
}
}
public override string SourceName
{
get
{
return input.SourceName;
}
}
[Conditional("ANTLR_TRACE")]
public virtual void TraceIn( string ruleName, int ruleIndex )
{
base.TraceIn( ruleName, ruleIndex, input.LT( 1 ) );
}
[Conditional("ANTLR_TRACE")]
public virtual void TraceOut( string ruleName, int ruleIndex )
{
base.TraceOut( ruleName, ruleIndex, input.LT( 1 ) );
}
}
}
|
