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;;; company-nxml.el --- company-mode completion backend for nxml-mode
;; Copyright (C) 2009-2011, 2013, 2018 Free Software Foundation, Inc.
;; Author: Nikolaj Schumacher
;; This file is part of GNU Emacs.
;; GNU Emacs 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 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; In Emacs >= 26, company-capf is used instead.
;;; Code:
(require 'company)
(require 'cl-lib)
(defvar rng-open-elements)
(defvar rng-validate-mode)
(defvar rng-in-attribute-regex)
(defvar rng-in-attribute-value-regex)
(declare-function rng-set-state-after "rng-nxml")
(declare-function rng-match-possible-start-tag-names "rng-match")
(declare-function rng-adjust-state-for-attribute "rng-nxml")
(declare-function rng-match-possible-attribute-names "rng-match")
(declare-function rng-adjust-state-for-attribute-value "rng-nxml")
(declare-function rng-match-possible-value-strings "rng-match")
(defconst company-nxml-token-regexp
"\\(?:[_[:alpha:]][-._[:alnum:]]*\\_>\\)")
(defvar company-nxml-in-attribute-value-regexp
(replace-regexp-in-string "w" company-nxml-token-regexp
"<w\\(?::w\\)?\
\\(?:[ \t\r\n]+w\\(?::w\\)?[ \t\r\n]*=\
\[ \t\r\n]*\\(?:\"[^\"]*\"\\|'[^']*'\\)\\)*\
\[ \t\r\n]+\\(w\\(:w\\)?\\)[ \t\r\n]*=[ \t\r\n]*\
\\(\"\\([^\"]*\\>\\)\\|'\\([^']*\\>\\)\\)\\="
t t))
(defvar company-nxml-in-tag-name-regexp
(replace-regexp-in-string "w" company-nxml-token-regexp
"<\\(/?w\\(?::w?\\)?\\)?\\=" t t))
(defun company-nxml-all-completions (prefix alist)
(let ((candidates (mapcar 'cdr alist))
(case-fold-search nil)
filtered)
(when (cdar rng-open-elements)
(push (concat "/" (cdar rng-open-elements)) candidates))
(setq candidates (sort (all-completions prefix candidates) 'string<))
(while candidates
(unless (equal (car candidates) (car filtered))
(push (car candidates) filtered))
(pop candidates))
(nreverse filtered)))
(defmacro company-nxml-prepared (&rest body)
(declare (indent 0) (debug t))
`(let ((lt-pos (save-excursion (search-backward "<" nil t)))
xmltok-dtd)
(when (and lt-pos (= (rng-set-state-after lt-pos) lt-pos))
,@body)))
(defun company-nxml-tag (command &optional arg &rest ignored)
(cl-case command
(prefix (and (derived-mode-p 'nxml-mode)
rng-validate-mode
(company-grab company-nxml-in-tag-name-regexp 1)))
(candidates (company-nxml-prepared
(company-nxml-all-completions
arg (rng-match-possible-start-tag-names))))
(sorted t)))
(defun company-nxml-attribute (command &optional arg &rest ignored)
(cl-case command
(prefix (and (derived-mode-p 'nxml-mode)
rng-validate-mode
(memq (char-after) '(?\ ?\t ?\n)) ;; outside word
(company-grab rng-in-attribute-regex 1)))
(candidates (company-nxml-prepared
(and (rng-adjust-state-for-attribute
lt-pos (- (point) (length arg)))
(company-nxml-all-completions
arg (rng-match-possible-attribute-names)))))
(sorted t)))
(defun company-nxml-attribute-value (command &optional arg &rest ignored)
(cl-case command
(prefix (and (derived-mode-p 'nxml-mode)
rng-validate-mode
(and (memq (char-after) '(?' ?\" ?\ ?\t ?\n)) ;; outside word
(looking-back company-nxml-in-attribute-value-regexp nil)
(or (match-string-no-properties 4)
(match-string-no-properties 5)
""))))
(candidates (company-nxml-prepared
(let (attr-start attr-end colon)
(and (looking-back rng-in-attribute-value-regex lt-pos)
(setq colon (match-beginning 2)
attr-start (match-beginning 1)
attr-end (match-end 1))
(rng-adjust-state-for-attribute lt-pos attr-start)
(rng-adjust-state-for-attribute-value
attr-start colon attr-end)
(all-completions
arg (rng-match-possible-value-strings))))))))
;;;###autoload
(defun company-nxml (command &optional arg &rest ignored)
"`company-mode' completion backend for `nxml-mode'."
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-nxml))
(prefix (or (company-nxml-tag 'prefix)
(company-nxml-attribute 'prefix)
(company-nxml-attribute-value 'prefix)))
(candidates (cond
((company-nxml-tag 'prefix)
(company-nxml-tag 'candidates arg))
((company-nxml-attribute 'prefix)
(company-nxml-attribute 'candidates arg))
((company-nxml-attribute-value 'prefix)
(sort (company-nxml-attribute-value 'candidates arg)
'string<))))
(sorted t)))
(provide 'company-nxml)
;;; company-nxml.el ends here
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