Support for exponential form of a complex number

[ronnycsharp]

Hi Dmitry,

maybe it's hard to implement, but it would be nice to have.
=> example: ..Tokenize("r * e^(i * phi)");

when we find an 'i' character in an exponent of the base 'e', then we can build a complex number from polar coordinates.

Perhaps you could think about it. =)

Best regards
Ronny

[sys27]

Possible, but I think that such logic is not related to Lexer. I think we should add some 'semantic' analyzer (as a part of parsing process, which will convert e^i to Complex number). Maybe, it will useful for #119.

[ronnycsharp]

sounds good.