[mkgmap-dev] Substring returns full string

Fri Nov 28 11:11:20 GMT 2014

Hi Gerd

> In ValueBuilder

> we receive the string  " substring:1:14"
> (with the leading blank) and that is not removed, so we don't match

OK, so this works if you quote the argument:
   '${rcnname | substring:"1:14"}'

but not with the old syntax.

The attached patch fixes this and I think it is safe against
breaking existing styles.  If it does break old styles, then
it will have to be un-applied - in general the old syntax
is ambiguous.

I've added an error check for when an unknown filter is seen,
which should make it obvious when something like this happens.

..Steve
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