How much of the book will you understand if you only read page 1?
If communication is 20% verbal and 80% nonverbal, and if communication is very nonlinear in understanding (as with your book example), how do we know what 1% of communication is? What does it mean, and how can we tell that the figure is correct, when our main or only way of detecting whether communication succeeded is through understanding or lack thereof?
That's not even a good test, due to miscommunication. Both parties might think it succeeded, but then much later on you find out the truth (maybe).
Somebody cursing in French can still be interpreted as anger even if you don't understand French, and written profanity can still be interpreted as anger even if you didn't hear it spoken.
Tone and language do complent each other, but neither is a prerequisite for the other like your book analogy would suggest.
Parsed perhaps, but it's so context sensitive that it's not useful, save for extremities. The same tone of voice can have so many meanings based on what's actually being said and yet another if you add context.