Modify the buttons and editor interface for the new expression
language, like the new op name for add, the new device name syntax,
and add new editing features, like simple selection behavior on
unary ops.
This contains a new, hand-written expression parser to replace the old
hack language based on string munging. The new approach is a simple
AST-based evaluation approach, instead of the "list of operations"
infix-based hack that there was before.
The new language for configuration has support for parentheses, and
counts "!" as a unary operator instead of the binary "NOT OR" operator
it was before. A simple example:
(X & Y) | !B
Explicit device references, and complex device names ("Right Y+") are
handled with backticks and colons:
(`SDL/0/6 axis joystick:Right X+` & `DInput/0/Keyboard Mouse:A`)
The basic editor UI that inserts tokens has not been updated to reflect
the new language.
Jasper St. Pierre