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JTB Base Examples:
JJTree/JTB
Pretty Printer
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ObjectVisitor:
Expression Translator
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Here you will find some examples and links to
programs built using JTB. To download .jar files, you may need to
click right-button on the file name and choose "Save Link As". Some
old examples and user-created programs for old versions of JTB may be obtained
here.
JTB Base Examples
These are examples provided by the author of JTB, Kevin Tao. Contact
current JTB developer Wanjun Wang at wanjun@purdue.edu
for questions, comments, etc.
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JJTree/JTB comparison. JJTree 1.0
(packaged with JavaCC 1.0) and JTB 1.2 were both used on a very simple
grammar subset of Scheme to perform the task of finding and reporting undeclared
variables. Download this example and examine the differences between
programming for JJTree and JTB. Also see the Other
Tools page for a discussion on the differences between these two tools.
This
example has been updated for use with JTB 1.2, JavaCC 1.0, and JJTree 1.0.
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Pretty printer for the Java 1.1 grammar.
This example uses the Java1.1.jj grammar file included with JavaCC 0.7.1
in its original form. It takes as input a Java file and outputs a
nicely indented version. The comments in the input file are preserved.
This example shows you how simple and organized the visitor pattern makes
this task. It uses the TreeFormatter template of JTB 1.2
(see the Documentation for details).
The example is now distributed in jar format. See the Sun's
Java documentation for information on using the jar utility.
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Java Tree Builder. As a slightly more complex
example of using JTB, the current version of JTB itself was bootstrapped
using a previous version of itself. Download
the package and see the source code.
ObjectVisitor Examples
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Expression Translator. This example
transforms an infix expression to a prefix expression. It uses the
Calc1.jj
grammar provided with the JavaCC distribution,
version 1.0. Some changes were made to the original grammar file
to fit in with JTB 1.2. This example shows you how to use ObjectVisitor
and ObjectDepthFirst. For more information, please read
the README file included in the example package. You may
also compare this example with the Advanced
Example on the JTB GJ page, and you will
find how GJ can reduce type castings.
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