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1 package com.genimen.djeneric.tools.generator.core.nodes;
2
3 import com.genimen.djeneric.tools.generator.core.DjentelParserEngine;
4 import com.genimen.djeneric.tools.generator.core.ParseException;
5 import com.genimen.djeneric.tools.generator.core.SimpleNode;
6 import com.genimen.djeneric.tools.generator.core.util.ParseContext;
7
8 public class IfNode extends SimpleNode
9 {
10
11 public IfNode(int i)
12 {
13 super(i);
14 }
15
16 public IfNode(DjentelParserEngine p, int i)
17 {
18 super(p, i);
19 }
20
21 public String  getName()
22 {
23 return "if";
24 }
25
26 public String toString()
27 {
28 return "";
29 }
30
31 public String evaluate(ParseContext context) throws ParseException
32 {
33 if (!(getChild(0) instanceof BooleanExpression))
34 {
35 if (getChild(0) instanceof ValueExpression)
36 {
37 ValueExpression ve = (ValueExpression) getChild(0);
38 Object o = ve.getValue(context);
39 if (o instanceof Boolean )
40 {
41 Boolean b = (Boolean ) o;
42 if (b.booleanValue()) return handleTrue(context);
43 else return handleFalse(context);
44 }
45 }
46 throw new ParseException("Not a boolean expression", beginLine, beginColumn);
47 }
48
49 BooleanExpression expr = (BooleanExpression) getChild(0);
50 if (expr.isTrue(context)) return handleTrue(context);
51 else return handleFalse(context);
52 }
53
54 String handleTrue(ParseContext context) throws ParseException
55 {
56 return getChild(1).evaluate(context);
57 }
58
59 String handleFalse(ParseContext context) throws ParseException
60 {
61 if (getChildCount() == 3)
63 {
64 return getChild(2).evaluate(context);
65 }
66 return "";
67 }
68 } |
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