Month: November 2012

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Get/Set local variables of JavaScript function from outside & Dynamic code insertion in JS function

I am working on a JavaScript framework that needs to get list of local function variables and set values of some of them. Unlike Java, JavaScript does not have runtime introspection
support. In Java you can do this using Java Reflection APIs, but I couldn’t think of any way to do this in JavaScript. So I searched on the web and came across two threads of discussions on StackOverflow –

There are some interesting solutions discussed in the above threads. The first one discusses solutions for setting local variable values. The second one interested me because I found the technique useful for injecting code (that will set local variable value) in a function.

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Implementing Eclipse Editor Plugin

I had presented a tutorial on implementing Eclipse Editor plugin a couple of years ago. Recently when I started implementing a new Eclipse editor, I was looking for that presentation, but couldn’t find it easily. I like to use my blog as reference for myself, so I thought I would post my Eclipse editor tutorial here.

For the tutorial, I created a new language called VGL (Vector Graphics Language) and built Eclipse editor plugin for it. The language is not important, and just serves the purpose for explaining how to create an editor. The tutorial starts with defining the language and then incrementally builds features of a typical Eclipse editor. I created separate projects for each step in the tutorial. There are nine Eclipse projects. Download and import project in Eclipse for each step if you want to see how it is built incrementally. The last project contains all the editor features covered in this tutorial.

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