elisp: Levels of Font Lock
22.6.5 Levels of Font Lock
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Some major modes offer three different levels of fontification. You can
define multiple levels by using a list of symbols for KEYWORDS in
‘font-lock-defaults’. Each symbol specifies one level of fontification;
it is up to the user to choose one of these levels, normally by setting
‘font-lock-maximum-decoration’ (
(emacs)Font Lock). The chosen
level’s symbol value is used to initialize ‘font-lock-keywords’.
Here are the conventions for how to define the levels of
fontification:
• Level 1: highlight function declarations, file directives (such as
include or import directives), strings and comments. The idea is
speed, so only the most important and top-level components are
fontified.
• Level 2: in addition to level 1, highlight all language keywords,
including type names that act like keywords, as well as named
constant values. The idea is that all keywords (either syntactic
or semantic) should be fontified appropriately.
• Level 3: in addition to level 2, highlight the symbols being
defined in function and variable declarations, and all builtin
function names, wherever they appear.
Info Catalog
elisp: Other Font Lock Variables
elisp: Font Lock Mode
elisp: Precalculated Fontification