JavaCC in GWT
This repository is a quick set of examples of how to get going with JavaCC in a GWT application. Basic inspiration came from http://cs.jsu.edu/wordpress/?p=72 and http://cs.jsu.edu/wordpress/?p=100, though since then GWT has solved one of the stumbling blocks mentioned, and I'm leaning on work done by https://github.com/restlet/restlet-framework-java and for the other (under the Apache2 license).
Slides from the GWT Community Hangout topic on this https://docs.google.com/presentation/d/1pFWFe5SBVf_B06V8wEteaxQ2RO3wHaf51m7nPZ0VRAE/edit?usp=sharing
Repo summary
There are three interesting branches here, following a quick talk I gave as part of a GWT Community Hangout, starting with two sample grammars from http://www.cs.rit.edu/~ats/java/html/skript/8_JavaCC.htmld/, and ending with a sample Java syntax highlighter.
Check out the branches from git, or click the links to download the source:
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calc0, based mostly on http://www.cs.rit.edu/~ats/java/code/programs/javacc/Calc0.jj, is a simple webapp that lets you type in simple math expressions and see if they are valid or not, based on the rules of the grammar.
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calc2, based mostly on http://www.cs.rit.edu/~ats/java/code/programs/javacc/Calc2.jj, is a slightly more useful webapp that acts as a calculator, based on the expressions entered (skipped exercise 1 with error handling, removed that from this sample)
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java, is a simple (yet slightly buggy) take at the interesting keywords in Java, where the parser wraps keywords or other special tokens in html tags so that they can be syntax highlighted easily. This grammar is compiled in two forms, a basic webapp that lets you toggle between a textarea and highlighted code, and a GWT library compiled to JS, suitable for providing syntax highlighting to other JS apps.
Running example apps
- GwtCalc0Parser app - type in simple arithmetic expressions and get feedback if they are accepted or not
- GwtCalc2Parser app - type in simple arithmetic expressions and see them evaluated (or get an error message)
- GwtJavaParser app - simple Java syntax highlighter (though it doesn't like
_s in variable or class names...) - java2html JS file - invoke
java2html(javaSource)get a syntax-highlighted html string (provide your own css). This sample app can be recompiled to include its own CSS.