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;;; tex-font.el --- Font-Lock support stolen from Emacs 21. -*- lexical-binding: t; -*-
;;
;; Copyright (C) 1985-2021 Free Software Foundation, Inc.
;; Maintainer: auctex-devel@gnu.org
;; Keywords: tex, faces
;; This file is part of AUC TeX.
;; AUC TeX is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; AUC TeX is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with AUC TeX; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Comments:
;; Please keep this file in sync with GNU Emacs 21.
;;; Code:
(defconst tex-font-lock-keywords-1
(eval-when-compile
(let* (;; Names of commands whose arg should be fontified as heading, etc.
(headings (regexp-opt
'("title" "begin" "end" "chapter" "part"
"section" "subsection" "subsubsection"
"paragraph" "subparagraph" "subsubparagraph"
"newcommand" "renewcommand" "newenvironment"
"newtheorem")
t))
(variables (regexp-opt
'("newcounter" "newcounter*" "setcounter" "addtocounter"
"setlength" "addtolength" "settowidth")
t))
(includes (regexp-opt
'("input" "include" "includeonly" "bibliography"
"epsfig" "psfig" "epsf" "nofiles" "usepackage"
"documentstyle" "documentclass" "verbatiminput"
"includegraphics" "includegraphics*")
t))
;; Miscellany.
(slash "\\\\")
(opt " *\\(\\[[^]]*\\] *\\)*")
;; This would allow highlighting \newcommand\CMD but requires
;; adapting subgroup numbers below.
;; (arg "\\(?:{\\(\\(?:[^{}\\]+\\|\\\\.\\|{[^}]*}\\)+\\)\\|\\\\[a-z*]+\\)"))
(arg "{\\(\\(?:[^{}\\]+\\|\\\\.\\|{[^}]*}\\)+\\)"))
(list
;; Heading args.
(list (concat slash headings "\\*?" opt arg)
;; If ARG ends up matching too much (if the {} don't match, f.ex)
;; jit-lock will do funny things: when updating the buffer
;; the re-highlighting is only done locally so it will just
;; match the local line, but defer-contextually will
;; match more lines at a time, so ARG will end up matching
;; a lot more, which might suddenly include a comment
;; so you get things highlighted bold when you type them
;; but they get turned back to normal a little while later
;; because "there's already a face there".
;; Using `keep' works around this un-intuitive behavior as well
;; as improves the behavior in the very rare case where you do
;; have a comment in ARG.
3 'font-lock-function-name-face 'keep)
(list (concat slash "\\(re\\)?newcommand\\** *\\(\\\\[A-Za-z@]+\\)")
2 'font-lock-function-name-face 'keep)
;; Variable args.
(list (concat slash variables " *" arg) 2 'font-lock-variable-name-face)
;; Include args.
(list (concat slash includes opt arg) 3 'font-lock-builtin-face)
;; Definitions. I think.
'("^[ \t]*\\\\def *\\\\\\(\\(\\w\\|@\\)+\\)"
1 font-lock-function-name-face))))
"Subdued expressions to highlight in TeX modes.")
(defconst tex-font-lock-keywords-2
(append tex-font-lock-keywords-1
(eval-when-compile
(let* (;;
;; Names of commands whose arg should be fontified with fonts.
(bold (regexp-opt '("textbf" "textsc" "textup"
"boldsymbol" "pmb")
t))
(italic (regexp-opt '("textit" "textsl" "emph") t))
;; (type (regexp-opt '("texttt" "textmd" "textrm" "textsf") t))
;;
;; Names of commands whose arg should be fontified as a citation.
(citations (regexp-opt
'("label" "ref" "pageref" "vref" "eqref"
"cite" "nocite" "index" "glossary" "bibitem"
;; These are text, rather than citations.
;; "caption" "footnote" "footnotemark" "footnotetext"
)
t))
;;
;; Names of commands that should be fontified.
(specials (regexp-opt
'("\\" "\\*" ;; "-"
"linebreak" "nolinebreak" "pagebreak" "nopagebreak"
"newline" "newpage" "clearpage" "cleardoublepage"
"displaybreak" "allowdisplaybreaks" "enlargethispage")
t))
(general "\\([a-zA-Z@]+\\**\\|[^ \t\n]\\)")
;;
;; Miscellany.
(slash "\\\\")
(opt " *\\(\\[[^]]*\\] *\\)*")
(arg "{\\(\\(?:[^{}\\]+\\|\\\\.\\|{[^}]*}\\)+\\)"))
(list
;;
;; Citation args.
(list (concat slash citations opt arg) 3 'font-lock-constant-face)
;;
;; Text between `` quotes ''.
(cons (concat (regexp-opt `("``" "\"<" "\"`" "<<" "«") t)
"[^'\">»]+" ;a bit pessimistic
(regexp-opt `("''" "\">" "\"'" ">>" "»") t))
'font-lock-string-face)
;;
;; Command names, special and general.
(cons (concat slash specials) 'font-lock-warning-face)
(concat slash general)
;;
;; Font environments. It seems a bit dubious to use `bold' etc. faces
;; since we might not be able to display those fonts.
(list (concat slash bold " *" arg) 2 '(quote bold) 'append)
(list (concat slash italic " *" arg) 2 '(quote italic) 'append)
;; (list (concat slash type arg) 2 '(quote bold-italic) 'append)
;;
;; Old-style bf/em/it/sl. Stop at `\\' and un-escaped `&', for tables.
(list (concat "\\\\\\(\\(bf\\)\\|em\\|it\\|sl\\)\\>"
"\\(\\([^}&\\]\\|\\\\[^\\]\\)+\\)")
3 '(if (match-beginning 2) 'bold 'italic) 'append)))))
"Gaudy expressions to highlight in TeX modes.")
(defvar tex-font-lock-keywords tex-font-lock-keywords-1
"Default expressions to highlight in TeX modes.")
(defface tex-math-face
'((t :inherit font-lock-string-face))
"Face used to highlight TeX math expressions."
:group 'tex)
(defvar tex-math-face 'tex-math-face)
;; Use string syntax but math face for $...$.
(defun tex-font-lock-syntactic-face-function (state)
(if (nth 3 state) tex-math-face font-lock-comment-face))
;;;###autoload
(defun tex-font-setup ()
"Setup font lock support for TeX."
(set (make-local-variable 'font-lock-defaults)
'((tex-font-lock-keywords
tex-font-lock-keywords-1 tex-font-lock-keywords-2)
nil nil ((?$ . "\"")) nil
;; Who ever uses that anyway ???
(font-lock-mark-block-function . mark-paragraph)
(font-lock-syntactic-face-function
. tex-font-lock-syntactic-face-function)))
)
(provide 'tex-font)
;; Local Variables:
;; coding: utf-8
;; End:
;;; tex-font.el ends here
|
