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annotate anagram/agcore/mrule.h @ 0:13d2b8934445

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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1993-2002 Parsifal Software. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * mrule.h - marked rules
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7 */
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8
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9 #ifndef MRULE_H
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10 #define MRULE_H
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11
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12 #include "rule.h"
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13
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14 class MarkedRule {
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15 public:
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16 Rule rule;
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17 int index;
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18
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19 MarkedRule() : rule(0), index(0) {}
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20 MarkedRule(const Rule &r, int x) : rule(r), index(x) {}
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21 MarkedRule(const Rule &r) : rule(r), index(r->length()) {}
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22
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23 int operator < (const MarkedRule &r) const {
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24 if ((int) rule < (int) r.rule) return 1;
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25 if ((int) r.rule < (int) rule) return 0;
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26 return index < r.index;
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27 }
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28
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29 Token leftToken() { return rule.token(index - 1); }
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30 Token rightToken() { return rule.token(index); }
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31 int positionLeft() { return index == 0; }
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32 int positionRight() { return (unsigned) index == rule->length(); }
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33 MarkedRule nextLeft() { return MarkedRule(rule, index - 1); }
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34 MarkedRule nextRight() { return MarkedRule(rule, index + 1); }
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35 };
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36
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37
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38 #endif /* MRULE_H */