67 lines
2.8 KiB
Java
67 lines
2.8 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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/**
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* Describes lookahead rule for a particular expansion or expansion
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* sequence (See Sequence.java). In case this describes the lookahead
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* rule for a single expansion unit, then a sequence is created with
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* this node as the first element, and the expansion unit as the second
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* and last element.
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*/
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public class Lookahead extends Expansion {
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/**
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* Contains the list of tokens that make up the semantic lookahead
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* if any. If this node represents a different kind of lookahead (other
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* than semantic lookahead), then this vector contains nothing. If
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* this vector contains something, then it is the boolean expression
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* that forms the semantic lookahead. In this case, the following
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* fields "amount" and "la_expansion" are ignored.
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*/
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public java.util.Vector action_tokens = new java.util.Vector();
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/**
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* The lookahead amount. Its default value essentially gives us
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* infinite lookahead.
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*/
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public int amount = Integer.MAX_VALUE;
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/**
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* The expansion used to determine whether or not to choose the
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* corresponding parse option. This expansion is parsed upto
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* "amount" tokens of lookahead or until a complete match for it
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* is found. Usually, this is the same as the expansion to be
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* parsed.
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*/
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public Expansion la_expansion;
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/**
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* Is set to true if this is an explicit lookahead specification.
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*/
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public boolean isExplicit;
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}
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