Algorithm to determine how positive or negative a statement/text is

Question

I need an algorithm to determine if a sentence, paragraph or article is negative or positive in tone... or better yet, how negative or positive.

For instance:

<

Answer 1

You can do like this:

    Jason is the worst SO user I have ever witnessed (-10)

worst (-), the rest is (+). so, that would be (-) + (+) = (-)

    Jason is an SO user (0)

( ) + ( ) = ( )

    Jason is the best SO user I have ever seen (+10)

best (+) , the rest is ( ). so, that would be (+) + ( ) = (+)

    Jason is the best at sucking with SO (-10)

best (+), sucking (-). so, (+) + (-) = (-)

    While, okay at SO, Jason is the worst at doing bad (+10)

worst (-), doing bad (-). so, (-) + (-) = (+)