Autocomplete libraries for Java, C, PHP?

I'm building an open-source autocomplete plugin for my text editor because it doesn't have one yet. Are there any autocomplete libraries I can use i.e. some sort of data file containing commonly used functions in Java, C, PHP etc?

I have the plugin built, but I don't particularly want to go through all of Java's documentation and hand-write the actual library that the plugin would referen开发者_Python百科ce. I'm just looking for a text file that contains something like:

String double boolean implements ..etc etc etc...

I'm sure someone has solved this problem before. Are there some simple text files somewhere containing common functions/tokens that I could use?

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It's not exactly what you're looking for, but ctags is your first friend here. Just a quick first step to get you going.