01: /*
02: [The "BSD licence"]
03: Copyright (c) 2005-2006 Terence Parr
04: All rights reserved.
05:
06: Redistribution and use in source and binary forms, with or without
07: modification, are permitted provided that the following conditions
08: are met:
09: 1. Redistributions of source code must retain the above copyright
10: notice, this list of conditions and the following disclaimer.
11: 2. Redistributions in binary form must reproduce the above copyright
12: notice, this list of conditions and the following disclaimer in the
13: documentation and/or other materials provided with the distribution.
14: 3. The name of the author may not be used to endorse or promote products
15: derived from this software without specific prior written permission.
16:
17: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27: */
28: package org.antlr.analysis;
29:
30: /** A transition used to reference another rule. It tracks two targets
31: * really: the actual transition target and the state following the
32: * state that refers to the other rule. Conversion of an NFA that
33: * falls off the end of a rule will be able to figure out who invoked
34: * that rule because of these special transitions.
35: */
36: public class RuleClosureTransition extends Transition {
37: /** Index of rule targeted by this transition */
38: protected int ruleIndex;
39:
40: /** What node to begin computations following ref to rule */
41: protected NFAState followState;
42:
43: public RuleClosureTransition(int ruleIndex, NFAState ruleStart,
44: NFAState followState) {
45: super (Label.EPSILON, ruleStart);
46: this .ruleIndex = ruleIndex;
47: this .followState = followState;
48: }
49:
50: public NFAState getFollowState() {
51: return followState;
52: }
53:
54: public int getRuleIndex() {
55: return ruleIndex;
56: }
57: }
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