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9
10
11 package org.nfunk.jep.evaluation;
12
13 import org.nfunk.jep.*;
14 import java.util.*;
15
16
17 public class ExpressionCompiler implements ParserVisitor {
18
19 private Vector commands;
20
21 public ExpressionCompiler() {
22 commands = new Vector();
23 }
24
25 public CommandElement[] compile(Node node) throws ParseException{
26 commands.removeAllElements();
27 node.jjtAccept(this, null);
28 CommandElement[] temp = new CommandElement[commands.size()];
29 Enumeration enum = commands.elements();
30 int i = 0;
31 while (enum.hasMoreElements()) {
32 temp[i++] = (CommandElement)enum.nextElement();
33 }
34 return temp;
35 }
36
37 public Object visit(ASTFunNode node, Object data) throws ParseException {
38 node.childrenAccept(this,data);
39
40 CommandElement c = new CommandElement();
41 c.setType(CommandElement.FUNC);
42 c.setPFMC(node.getPFMC());
43 c.setNumParam(node.jjtGetNumChildren());
44 commands.addElement(c);
45
46 return data;
47 }
48
49 public Object visit(ASTVarNode node, Object data) {
50 CommandElement c = new CommandElement();
51 c.setType(CommandElement.VAR);
52 c.setVarName(node.getName());
53 commands.addElement(c);
54
55 return data;
56 }
57
58 public Object visit(ASTConstant node, Object data) {
59 CommandElement c = new CommandElement();
60 c.setType(CommandElement.CONST);
61 c.setValue(node.getValue());
62 commands.addElement(c);
63
64 return data;
65 }
66
67 public Object visit(SimpleNode node, Object data) {
68 return data;
69 }
70
71 public Object visit(ASTStart node, Object data) {
72 return data;
73 }
74 }
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