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(elisp)Other Font Lock Variables

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Other Font Lock Variables
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   This section describes additional variables that a major mode can
set by means of `font-lock-defaults'.

 - Variable: font-lock-keywords-only
     Non-`nil' means Font Lock should not fontify comments or strings
     syntactically; it should only fontify based on
     `font-lock-keywords'.

 - Variable: font-lock-keywords-case-fold-search
     Non-`nil' means that regular expression matching for the sake of
     `font-lock-keywords' should be case-insensitive.

 - Variable: font-lock-syntax-table
     This variable specifies the syntax table to use for fontification
     of comments and strings.

 - Variable: font-lock-beginning-of-syntax-function
     If this variable is non-`nil', it should be a function to move
     point back to a position that is syntactically at "top level" and
     outside of strings or comments.  Font Lock uses this when necessary
     to get the right results for syntactic fontification.

     This function is called with no arguments.  It should leave point
     at the beginning of any enclosing syntactic block.  Typical values
     are `beginning-of-line' (i.e., the start of the line is known to be
     outside a syntactic block), or `beginning-of-defun' for programming
     modes or `backward-paragraph' for textual modes (i.e., the
     mode-dependent function is known to move outside a syntactic
     block).

     If the value is `nil', the beginning of the buffer is used as a
     position outside of a syntactic block.  This cannot be wrong, but
     it can be slow.

 - Variable: font-lock-mark-block-function
     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-g M-g'
     (`font-lock-fontify-block').

     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.