Syntactic fontification uses a syntax table (see Syntax Tables) to find and highlight syntactically relevant text. If enabled, it runs prior to search-based fontification. The variable
font-lock-syntactic-face-function, documented below, determines which syntactic constructs to highlight. There are several variables that affect syntactic fontification; you should set them by means of
font-lock-defaults (see Font Lock Basics).
Whenever Font Lock mode performs syntactic fontification on a stretch of text, it first calls the function specified by
syntax-propertize-function. Major modes can use this to apply
syntax-table text properties to override the buffer’s syntax table in special cases. See Syntax Properties.
If the value of this variable is non-
nil, Font Lock does not do syntactic fontification, only search-based fontification based on
font-lock-keywords. It is normally set by Font Lock mode based on the
keywords-only element in
font-lock-defaults. If the value is
nil, Font Lock will call
jit-lock-register (see Other Font Lock Variables) to set up for automatic refontification of buffer text following a modified line to reflect the new syntactic context due to the change.
This variable holds the syntax table to use for fontification of comments and strings. It is normally set by Font Lock mode based on the
syntax-alist element in
font-lock-defaults. If this value is
nil, syntactic fontification uses the buffer’s syntax table (the value returned by the function
syntax-table; see Syntax Table Functions).
If this variable is non-
nil, it should be a function to determine which face to use for a given syntactic element (a string or a comment).
The function is called with one argument, the parse state at point returned by
parse-partial-sexp, and should return a face. The default value returns
font-lock-comment-face for comments and
font-lock-string-face for strings (see Faces for Font Lock).
This variable is normally set through the “other" elements in
nil nil nil nil