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1 package com.teamkonzept.lib.templates;
2
3 import java.io.*;
4
5 import com.teamkonzept.lib.*;
6 import com.teamkonzept.lib.math.*;
7 import org.apache.log4j.Category;
8
9
13 public class TKEvalTag extends TKLabelTag
14 {
15 private static final Category CAT = Category.getInstance(TKEvalTag.class);
16
17 public static final int TAG_TYPE = TKSetTag.TAG_TYPE+1;
18
19
23 public TKEvalTag( TKTemplateSyntax parent, String  name, boolean hasSubTags ) throws TKTemplateSyntaxException
24 {
25 super( parent, name, hasSubTags );
26 }
27
28
32 public String apply( TKTemplateData td ) throws TKTemplateSyntaxException
33 {
34 String expression = getLabel( td );
35 StringBuffer buf = new StringBuffer ();
36 for (int i = 0; i < expression.length(); i++) {
37
38 char chr = expression.charAt(i);
39 if (chr == '\\')
40 {
41 if ((i+1) >= expression.length()) break;
42 else chr = expression.charAt(i);
43 }
44 buf.append(chr);
45 }
46
47 Eval ev = new Eval();
48 String result = "";
49 try {
50 result = Double.toString( ev.eval( buf.toString() ) );
51 if( result.endsWith(".0") ) {
52 result = result.substring( 0, result.length()-2 );
53 }
54 }
55 catch( Exception e ) {
56 CAT.error( "error in eval-expression \""+expression+"\": ",e);
57 }
58 return result;
59 }
60
61 public void apply(TKTemplateData td, Writer writer)
62 throws TKTemplateSyntaxException, IOException
63 {
64 String expression = getLabel( td );
65 StringBuffer buf = new StringBuffer ();
66 for (int i = 0; i < expression.length(); i++)
67 {
68 char chr = expression.charAt(i);
69 if (chr == '\\')
70 {
71 if ((i+1) >= expression.length()) break;
72 else chr = expression.charAt(i);
73 }
74 buf.append(chr);
75 }
76
77 Eval ev = new Eval();
78 String result = "";
79 try {
80 result = Double.toString( ev.eval( buf.toString() ) );
81 if( result.endsWith(".0") ) {
82 result = result.substring( 0, result.length()-2 );
83 }
84 }
85 catch( Exception e ) {
86 CAT.error( "error in eval-expression \""+expression+"\": ",e);
87 }
88
89 writer.write(result);
90 }
91
92
93 }
94
95 |
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