;;; company-math.el --- Completion backends for unicode math symbols and latex tags -*- lexical-binding: t -*-
;;
;; Copyright (C) 2015-2019 Free Software Foundation, Inc.
;; Author: Vitalie Spinu
;; URL: https://github.com/vspinu/company-math
;; Package-Version: 20200131.2337
;; Package-Commit: a796053590012e6a15c8b527b521ffc15d137bd0
;; Keywords: Unicode, symbols, completion
;; Version: 1.4
;; Package-Requires: ((company "0.8.0") (math-symbol-lists "1.3"))
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; This file is part of GNU Emacs.
;;
;; This program 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.
;;
;; This program 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 GNU Emacs. If not, see .
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;;; Code:
(require 'math-symbol-lists)
(require 'company)
(require 'cl-lib)
(defgroup company-math nil
"Completion back-ends for math symbols Unicode symbols and LaTeX tags."
:group 'company
:prefix "company-math-")
(defcustom company-math-symbol-prefix "\\"
"Prefix to use for latex and unicode symbols."
:group 'company-math
:type 'string)
(defcustom company-math-subscript-prefix "__"
"Prefix for unicode subscripts.
When nil, no custom prefix is active. Irrespective of the value
of this variable, prefix composed of `company-math-symbol-prefix'
and \"_\" is always active (\"\\_\"). This variable takes effect
in a new Emacs session."
:group 'company-math
:type '(choice (const :tag "No Custom Prefix" nil)
string))
(defcustom company-math-superscript-prefix "^^"
"Prefix for unicode superscripts.
When nil, no custom prefix is active. Irrespective of the value
of this variable, prefix composed of `company-math-symbol-prefix'
and \"^\" is always active (\"\\^\"). This variable takes effect
in a new Emacs session."
:group 'company-math
:type '(choice (const :tag "No Custom Prefix" nil)
string))
;; no more custom since since v.1.2
(when (boundp 'company-math-prefix-regexp)
(warn "`company-math-prefix-regexp' is deprecated, please remove from your custom settings."))
(defvar company-math--latex-prefix-regexp
(concat (regexp-quote company-math-symbol-prefix)
"[^ \t\n]+"))
(let ((psym (regexp-quote company-math-symbol-prefix))
(psub (when company-math-symbol-prefix
(concat "\\|" (regexp-quote company-math-subscript-prefix))))
(psup (when company-math-superscript-prefix
(concat "\\|" (regexp-quote company-math-superscript-prefix)))))
(setq company-math--unicode-prefix-regexp
(concat "\\(" psym psub psup "\\)[^ \t\n]*")))
(defcustom company-math-allow-unicode-symbols-in-faces t
"List of faces to allow the insertion of Unicode symbols.
When set to special value t, allow on all faces except those in
`company-math-disallow-unicode-symbols-in-faces'."
:group 'company-math
:type '(choice (const t)
(repeat :tag "Faces" symbol)))
(defcustom company-math-allow-latex-symbols-in-faces '(tex-math font-latex-math-face org-latex-and-related)
"List of faces to disallow the insertion of latex mathematical symbols.
When set to special value t, allow on all faces except those in
`company-math-disallow-latex-symbols-in-faces'."
:group 'company-math
:type '(choice (const t)
(repeat :tag "Faces" symbol)))
(defcustom company-math-disallow-unicode-symbols-in-faces '(font-latex-math-face)
"List of faces to disallow the insertion of Unicode symbols."
:group 'company-math
:type '(repeat symbol))
(defcustom company-math-disallow-latex-symbols-in-faces '()
"List of faces to disallow the insertion of latex mathematical symbols."
:group 'company-math
:type '(repeat symbol))
;;; INTERNALS
(defun company-math--make-candidates (alist prefix)
"Build a list of math symbols ready to be used in a company backend.
ALIST is one of the defined alist in package `math-symbol-lists'.
PREFIX is a string to be prefixed to each symbol. Return a list
of LaTeX symbols with text property :symbol being the
corresponding unicode symbol."
(delq nil
(mapcar
(lambda (el)
(let* ((tex (concat prefix (substring (nth 1 el) 1)))
(ch (and (nth 2 el) (decode-char 'ucs (nth 2 el))))
(symb (and ch (char-to-string ch))))
(propertize tex :symbol symb)))
alist)))
(defconst company-math--latex-commands
(mapcar (lambda (c) (concat company-math-symbol-prefix c)) math-symbol-list-latex-commands)
"List of LaTeX math completion candidates.")
(defconst company-math--symbols
(delete-dups
(append (company-math--make-candidates math-symbol-list-basic company-math-symbol-prefix)
(company-math--make-candidates math-symbol-list-extended company-math-symbol-prefix)))
"List of LaTeX math completion candidates.")
(defconst company-math--unicode
(append
(append (when company-math-subscript-prefix
(company-math--make-candidates math-symbol-list-subscripts company-math-subscript-prefix))
(company-math--make-candidates math-symbol-list-subscripts (concat company-math-symbol-prefix "_"))
(when company-math-superscript-prefix
(company-math--make-candidates math-symbol-list-superscripts company-math-superscript-prefix))
(company-math--make-candidates math-symbol-list-superscripts (concat company-math-symbol-prefix "^")))
company-math--symbols)
"List of math completion candidates for unicode backend.")
(defun company-math--prefix (regexp allow-faces disallow-faces)
"Response to company prefix command.
REGEXP is the regexp, ALLOW-FACES and DISALLOW-FACES are list of
various faces to allow or disallow completion on."
(let* ((face (get-text-property (point) 'face))
(face (or (car-safe face) face))
(insertp (and (not (memq face disallow-faces))
(or (eq t allow-faces)
(memq face allow-faces)))))
(when insertp
(save-excursion
(let* ((ppss (syntax-ppss))
(min-point (if (nth 3 ppss)
(max (nth 8 ppss) (point-at-bol))
(point-at-bol))))
(when (looking-back regexp min-point 'greedy)
(match-string 0)))))))
(defun company-math--substitute-unicode (symbol)
"Substitute preceding latex command with with SYMBOL."
(let ((pos (point))
(inhibit-point-motion-hooks t))
(when (re-search-backward company-math--unicode-prefix-regexp) ; should always match
(goto-char (match-beginning 0))
;; allow subsups to start with \
(let ((start (max (point-min) (- (point) (length company-math-symbol-prefix)))))
(when (string= (buffer-substring-no-properties start (point))
company-math-symbol-prefix)
(goto-char start)))
(delete-region (point) pos)
(insert symbol))))
;;; BACKENDS
;;;###autoload
(defun company-latex-commands (command &optional arg &rest _ignored)
"Company backend for latex commands.
COMMAND and ARG is as required by company backends."
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-latex-commands))
(prefix (unless (company-in-string-or-comment)
(company-math--prefix company-math--latex-prefix-regexp t '())))
(candidates (all-completions arg company-math--latex-commands))
(sorted t)))
;;;###autoload
(defun company-math-symbols-latex (command &optional arg &rest _ignored)
"Company backend for LaTeX mathematical symbols.
COMMAND and ARG is as required by company backends."
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-math-symbols-latex))
(prefix (unless (company-in-string-or-comment)
(company-math--prefix company-math--latex-prefix-regexp
company-math-allow-latex-symbols-in-faces
company-math-disallow-latex-symbols-in-faces)))
(annotation (concat " " (get-text-property 0 :symbol arg)))
(candidates (all-completions arg company-math--symbols))))
;;;###autoload
(defun company-math-symbols-unicode (command &optional arg &rest _ignored)
"Company backend for insertion of Unicode mathematical symbols.
COMMAND and ARG is as required by company backends.
See the unicode-math page [1] for a list of fonts that have a
good support for mathematical symbols. Unicode provides only a
limited range of sub(super)scripts; see the wikipedia page [2]
for details.
[1] http://ftp.snt.utwente.nl/pub/software/tex/help/Catalogue/entries/unicode-math.html
[2] https://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts"
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-math-symbols-unicode))
(prefix (company-math--prefix company-math--unicode-prefix-regexp
company-math-allow-unicode-symbols-in-faces
company-math-disallow-unicode-symbols-in-faces))
(annotation (concat " " (get-text-property 0 :symbol arg)))
;; Space added to ensure that completions are never typed in full.
;; See https://github.com/company-mode/company-mode/issues/476
(candidates (delq nil
(mapcar (lambda (candidate)
(when (get-text-property 0 :symbol candidate)
(concat candidate " ")))
(all-completions arg company-math--unicode))))
(post-completion (company-math--substitute-unicode
(get-text-property 0 :symbol arg)))))
(provide 'company-math)
;;; company-math.el ends here