Implementation of hyphenation-ladder-count.
Just a couple of annotations:
- this implementation does not store any extra information inside the
nodes: the algorithm checks wheter a break is ok or not using a for loop;
if you prefer, I could change this so that the number of consecutive lines
ending with a hyphen is stored inside the nodes, and the check takes a
- the specs states that this property "Specifies a limit on the number of
successive hyphenated line-areas the formatter may generate *in a
block-area*"; so, if the value is 2 and a block creates 5 lines, the first
4 lines could all end with a hyphen provided there is a break after the
second one. This implementation would not create such a set of lines:
anyway, the produced output still satisfies the condition; in other words,
we check a more strict condition.