I'm wondering if it's possible to use a CFG or PEG grammar as a basis for code completion directly without modification. I have heard that code completion is in IDE's is sometimes manipulated and massaged or even hard coded so that it performs better.

I want to code complete on a small DSL so I fully understand that a grammar cannot help a code completion system with knowledge of library functions etc.

As far as I'm aware the parser itself needs to at least provide a system for querying what it expects next.

In particular I'm interested in a javascript code completion solution using peg.js or jison

javascript parsing context-free-grammar code-completion peg
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