Adds support for using these in the weapons and ability filters:
* "-1", which was previously treated as an parse error (no number before the separator).
* "-3--1"
* "-infinity" as the lower number in the range, provided a different upper number is given.
This treats "-infinity" (with no other number), "-infinity--infinity",
"infinity" (with no other number) and "infinity-infinity" as errors. It seems
unlikely that someone would intend to use a filter that can't match any
reasonable number.
The range "-infinity-infinity" will be parsed successfully. I don't see a use
case for that, but nor do I see a reason to add extra C++ to reject it.
However, it's not added to the schema, as I think it's good for the schema to
give a warning when someone creates a filter which will accept every value
(including accepting the default, so "-infinity-infinity" accepts the unset
value too).
Includes new unit tests for the C++ and the Lua stringx.parse_range functions.
The next commit adds more WML tests, but is kept separate to credit the author.
This started as a change to move common filter functions from unit.cpp to
somewhere that they could be reused for other config-based filters. In the
process a missing feature was found and added, the move is still included in a
single Git commit because the move was required in order to make these
functions accessible to the Boost unit tests.
Two CodeBlocks project files additionally get src/utils/any.hpp added,
which was in one of them but missing from the other two. I noticed because
these are alphabetically at the start of the src/utils file list.
Thanks to @CelticMinstrel for the review comments and Xcode project updates.
cc8dddea6e