imported LUA math parser from PGF and made it compile
experimented with LPEG math parser prototype
added support for x^2 to lua math parser
Added support for - prefix operator
Added support for - prefix operator and factorial and fixed spacing issues
added end-of-string matching
added todo items
code cleanup
Added first draft which runs the survey phase of \addplot expression completely in LUA
math parser: added 'r' postfix operator
math parser: added ternary op
added relational operators
added prefix !
Added logical operators
math parser now detects tex dimen/count registers
cleanup