blob: a55d3dcc09125cc989a3fc6a48d890e43f32e248 (
plain)
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
|
/*
* TokenRule.java
*
* comments here.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1998 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package io.devnulllabs.openjava.syntax;
import io.devnulllabs.openjava.ptree.Leaf;
import io.devnulllabs.openjava.ptree.ParseTree;
import io.devnulllabs.openjava.tools.parser.Token;
/**
* The class <code>TokenRule</code> represents the syntax
* rule of a list separated by an separator.
* <p>
* Suppose there's a syntax rule A and token t. This class can
* represents the syntax A ( t A )*.
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: TokenRule.java,v 1.2 2003/02/19 02:54:31 tatsubori Exp $
* @see java.lang.Object
*/
public final class TokenRule extends AbstractSyntaxRule {
private int tokenID;
/**
* Allocates a new rule representing a specified token.
*
* @param separator_token the id of a token.
* @see io.devnulllabs.openjava.syntax.TokenID
*/
public TokenRule(int token_id) {
this.tokenID = token_id;
}
/**
* Consumes token source.
*
* @param token_src token source.
* @return null if this fails to consume a syntax tree represented
* by this object. Otherwise it returns <code>ObjectList</code> object.
*/
public final ParseTree consume(TokenSource token_src)
throws SyntaxException {
Token t = token_src.getNextToken();
if (t.kind != tokenID) {
/***** to become specifed error report */
throw new SyntaxException("un expected token");
}
return new Leaf(t.kind, t.image, t.beginLine, t.beginColumn);
}
}
|
