How does Eclipse identify Keywords

Eclipse - Code Assist, I want to know how to update the Eclipse code Assist.

ie. Keywords like instanceof , for , etc. Using Ctrl + Space will automatically inse开发者_高级运维rt corresponding words in Workspace.

If i want to create new Language support means. What should i do for keywords?

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For support content Assist for a new language, I would recommend XText

The framework supports the development of language infrastructures including compilers and interpreters as well as full blown Eclipse-based IDE integration.

It includes code completion (as well as syntax highlighting, and many other Editor features).