Hi,

instaparse does not support readers and it cannot at the moment mainly 
because it uses JDK RegEx which do not support readers (thanks to Mark 
Engelbert for supplying this info). 
IMHO you cannot greedyly consume a reader and then decide that a match was 
not found due to the side-effect of the mutating/destructive consumption.

Reading (i.e. consuming) the reader until I find the terminal character is 
the way to go. But the "embedded language" could also
contain the terminal char. So the "solution" I came up with consumes the 
reader until it finds the terminal char,
tries to successfully find a complete parse of this "head" and continues if 
it does not find such a parse (this is not elegent but in practice
it works for me). So if/when I find a parseable head the "tail" is still in 
the reader and can be consumed by someone else (e.g. the caller of my 
function which I do not control). 
This scheme is a "non-greedy-parse".

I'm using "]" as the terminal char. So the Grammar/embeded language should 
have "balanced [...]". Otherwise the non-greddy-parse might miss a 
parseable head
that is still ahead of the first head that we find.

I'll post my solution hopefully next week and put it on github. Stay tuned.

Regards,
Henrik

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