I'd wager it falls under
2.5 Data Mining. You may not intercept, mine or otherwise collect information from the Game using unauthorized third party software.

http://support.na.square-enix.com/ru...2&tag=users_en

A parser is a third party program that collects information from the battle log (game), compiles it, then sends it back to you. As such, it's technically forbidden. However SE is willing to turn a blind on this offense if you do not use the compiled information in a way that negatively affects other players.