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Starting with Emacs 21, a hook is available for automatically assigning faces to text in the buffer. This hook is used for part of the implementation of Font-Lock mode.
The functions are called in the order listed, with one argument, a buffer position pos. Each function should attempt to assign faces to the text in the current buffer starting at pos.
Each function should record the faces they assign by setting the
face property. It should also add a non-
fontified property for all the text it has assigned faces to.
That property tells redisplay that faces have been assigned to that text
It is probably a good idea for each function to do nothing if the
character after pos already has a non-
property, but this is not required. If one function overrides the
assignments made by a previous one, the properties as they are
after the last function finishes are the ones that really matter.
For efficiency, we recommend writing these functions so that they usually assign faces to around 400 to 600 characters at each call.
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