Source Code Cross Referenced for NodeEvaluator.java in  » Scripting » oscript-2.10.4 » oscript » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » oscript 2.10.4 » oscript 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*=============================================================================
02:         *     Copyright Texas Instruments 2000.  All Rights Reserved.
03:         *   
04:         * This program is free software; you can redistribute it and/or
05:         * modify it under the terms of the GNU Lesser General Public
06:         * License as published by the Free Software Foundation; either
07:         * version 2 of the License, or (at your option) any later version.
08:         * 
09:         * This program is distributed in the hope that it will be useful,
10:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
11:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12:         * Lesser General Public License for more details.
13:         * 
14:         * You should have received a copy of the GNU Lesser General Public
15:         * License along with this library; if not, write to the Free Software
16:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17:         * 
18:         * $ProjectHeader: OSCRIPT 0.155 Fri, 20 Dec 2002 18:34:22 -0800 rclark $
19:         */
20:
21:        package oscript;
22:
23:        import oscript.data.Scope;
24:        import oscript.util.*;
25:        import oscript.exceptions.PackagedScriptObjectException;
26:
27:        /**
28:         * A <code>NodeEvaluator</code> is created by the <code>NodeFactory</code> to 
29:         * evaluate a node.  The node-evaluator can be used any number of times in 
30:         * order to evaluate a node, and must be thread safe.
31:         * 
32:         * @author Rob Clark (rob@ti.com)
33:         * <!--$Format: " * @version $Revision$"$-->
34:         * @version 1.2
35:         */
36:        public abstract class NodeEvaluator {
37:            /**
38:             * Evaluate, in the specified scope.
39:             * 
40:             * @param sf           the stack frame to evaluate the node in
41:             * @param scope        the scope to evaluate the node in
42:             * @return the result of evaluating the node
43:             */
44:            public abstract Object evalNode(StackFrame sf, Scope scope)
45:                    throws PackagedScriptObjectException;
46:
47:            /**
48:             * Get the file that this node was parsed from.
49:             * 
50:             * @return the file
51:             */
52:            public abstract oscript.fs.AbstractFile getFile();
53:
54:            /**
55:             * Get the function symbol (name), if this node evaluator is a function, 
56:             * otherwise return <code>-1</code>.
57:             * 
58:             * @return the symbol, or <code>-1</code>
59:             */
60:            public abstract int getId();
61:
62:            public static final int ALL = 0x00;
63:            public static final int PUBPROT = 0x01;
64:            public static final int PRIVATE = 0x02;
65:
66:            public static final int[] SMIT_PERMS = { ALL, PUBPROT, PRIVATE };
67:
68:            /**
69:             * Get the SMIT for the scope(s) created when invoking this node evaluator.
70:             * 
71:             * @param perm  <code>PRIVATE</code>, <code>PUBPROT</code>,
72:             *   <code>ALL</code>
73:             */
74:            public abstract SymbolTable getSharedMemberIndexTable(int perm);
75:        }
76:
77:        /*
78:         *   Local Variables:
79:         *   tab-width: 2
80:         *   indent-tabs-mode: nil
81:         *   mode: java
82:         *   c-indentation-style: java
83:         *   c-basic-offset: 2
84:         *   eval: (c-set-offset 'substatement-open '0)
85:         *   eval: (c-set-offset 'case-label '+)
86:         *   eval: (c-set-offset 'inclass '+)
87:         *   eval: (c-set-offset 'inline-open '0)
88:         *   End:
89:         */
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