[SOLVED]I can not find the source code of text processing extension in eclipse

Hello, I've installed the text processing extension in RapidMiner through help->update. I run the RapidMiner through eclipse.  Now I want to have a look at the source code of the text processing extension, and may change or add some operators. But I can not find the source code in eclipse. I also searched the source code directory in src.com.rapidminer.operator, but the directory named 'text' is empty. That's quite strange because I can find the text processing operators in RapidMiner GUI and they works fine. Can anybody tell me where I can find the installed code of text processing extension (not on internet, just in my Rapidminer directory)? Is there any possibility to modify the extension code through eclipse? I'm planning to modify the code for a research, so it's really a problem for me! Thanks in advance!