90 lines
3.2 KiB
Java
90 lines
3.2 KiB
Java
/*
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* Copyright © 2002 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* California 95054, U.S.A. All rights reserved. Sun Microsystems, Inc. has
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* intellectual property rights relating to technology embodied in the product
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* that is described in this document. In particular, and without limitation,
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* these intellectual property rights may include one or more of the U.S.
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* patents listed at http://www.sun.com/patents and one or more additional
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* patents or pending patent applications in the U.S. and in other countries.
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* U.S. Government Rights - Commercial software. Government users are subject
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* to the Sun Microsystems, Inc. standard license agreement and applicable
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* provisions of the FAR and its supplements. Use is subject to license terms.
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* Sun, Sun Microsystems, the Sun logo and Java are trademarks or registered
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* trademarks of Sun Microsystems, Inc. in the U.S. and other countries. This
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* product is covered and controlled by U.S. Export Control laws and may be
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* subject to the export or import laws in other countries. Nuclear, missile,
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* chemical biological weapons or nuclear maritime end uses or end users,
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* whether direct or indirect, are strictly prohibited. Export or reexport
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* to countries subject to U.S. embargo or to entities identified on U.S.
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* export exclusion lists, including, but not limited to, the denied persons
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* and specially designated nationals lists is strictly prohibited.
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*/
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package csjavacc.struct;
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import csjavacc.parser.Token;
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/**
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* Describes regular expressions.
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*/
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abstract public class RegularExpression extends Expansion {
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/**
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* The label of the regular expression (if any). If no label is
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* present, this is set to "".
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*/
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public String label = "";
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/**
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* The ordinal value assigned to the regular expression. It is
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* used for internal processing and passing information between
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* the parser and the lexical analyzer.
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*/
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public int ordinal;
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/**
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* The LHS to which the token value of the regular expression
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* is assigned. In case there is no LHS, then the vector
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* remains empty.
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*/
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public java.util.Vector lhsTokens = new java.util.Vector();
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/**
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* We now allow qualified access to token members. Store it here.
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*/
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public Token rhsToken;
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/**
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* This flag is set if the regular expression has a label prefixed
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* with the # symbol - this indicates that the purpose of the regular
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* expression is solely for defining other regular expressions.
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*/
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public boolean private_rexp = false;
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/**
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* If this is a top-level regular expression (nested directly
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* within a TokenProduction), then this field point to that
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* TokenProduction object.
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*/
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public TokenProduction tpContext = null;
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abstract public Nfa GenerateNfa(boolean ignoreCase);
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public boolean CanMatchAnyChar()
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{
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return false;
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}
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/**
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* The following variable is used to maintain state information for the
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* loop determination algorithm: It is initialized to 0, and
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* set to -1 if this node has been visited in a pre-order walk, and then
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* it is set to 1 if the pre-order walk of the whole graph from this
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* node has been traversed. i.e., -1 indicates partially processed,
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* and 1 indicates fully processed.
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*/
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public int walkStatus = 0;
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}
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