This section describes additional variables that a major mode can set by means of
font-lock-defaults (see Font Lock Basics).
If this variable is non-
nil, it should be a function that is called with no arguments, to choose an enclosing range of text for refontification for the command
M-o M-o (
The function should report its choice by placing the region around it. A good choice is a range of text large enough to give proper results, but not too large so that refontification becomes slow. Typical values are
mark-defun for programming modes or
mark-paragraph for textual modes.
This variable specifies additional properties (other than
font-lock-face) that are being managed by Font Lock mode. It is used by
font-lock-default-unfontify-region, which normally only manages the
font-lock-face property. If you want Font Lock to manage other properties as well, you must specify them in a
font-lock-keywords as well as add them to this list. See Search-based Fontification.
Function to use for fontifying the buffer. The default value is
Function to use for unfontifying the buffer. This is used when turning off Font Lock mode. The default value is
Function to use for fontifying a region. It should take two arguments, the beginning and end of the region, and an optional third argument
verbose is non-
nil, the function should print status messages. The default value is
Function to use for unfontifying a region. It should take two arguments, the beginning and end of the region. The default value is
Function to use for declaring that a region’s fontification is out of date. It takes two arguments, the beginning and end of the region. The default value of this variable is
Function to use for making sure a region of the current buffer has been fontified. It is called with two arguments, the beginning and end of the region. The default value of this variable is a function that calls
font-lock-default-fontify-buffer if the buffer is not fontified; the effect is to make sure the entire accessible portion of the buffer is fontified.
function jit-lock-register function \&optional contextual
This function tells Font Lock mode to run the Lisp function
function any time it has to fontify or refontify part of the current buffer. It calls
function before calling the default fontification functions, and gives it two arguments,
end, which specify the region to be fontified or refontified.
The optional argument
contextual, if non-
nil, forces Font Lock mode to always refontify a syntactically relevant part of the buffer, and not just the modified lines. This argument can usually be omitted.
When Font Lock is activated in a buffer, it calls this function with a non-
nil value of
contextual if the value of
font-lock-keywords-only (see Syntactic Font Lock) is
function jit-lock-unregister function
function was previously registered as a fontification function using
jit-lock-register, this function unregisters it.