;;; company-nxml.el --- company-mode completion backend for nxml-mode
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;; Copyright (C) 2009-2011, 2013, 2018 Free Software Foundation, Inc.
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;; Author: Nikolaj Schumacher
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; In Emacs >= 26, company-capf is used instead.
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;;; Code:
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(require 'company)
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(require 'cl-lib)
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(defvar rng-open-elements)
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(defvar rng-validate-mode)
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(defvar rng-in-attribute-regex)
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(defvar rng-in-attribute-value-regex)
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(declare-function rng-set-state-after "rng-nxml")
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(declare-function rng-match-possible-start-tag-names "rng-match")
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(declare-function rng-adjust-state-for-attribute "rng-nxml")
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(declare-function rng-match-possible-attribute-names "rng-match")
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(declare-function rng-adjust-state-for-attribute-value "rng-nxml")
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(declare-function rng-match-possible-value-strings "rng-match")
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(defconst company-nxml-token-regexp
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"\\(?:[_[:alpha:]][-._[:alnum:]]*\\_>\\)")
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(defvar company-nxml-in-attribute-value-regexp
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(replace-regexp-in-string "w" company-nxml-token-regexp
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"<w\\(?::w\\)?\
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\\(?:[ \t\r\n]+w\\(?::w\\)?[ \t\r\n]*=\
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\[ \t\r\n]*\\(?:\"[^\"]*\"\\|'[^']*'\\)\\)*\
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\[ \t\r\n]+\\(w\\(:w\\)?\\)[ \t\r\n]*=[ \t\r\n]*\
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\\(\"\\([^\"]*\\>\\)\\|'\\([^']*\\>\\)\\)\\="
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t t))
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(defvar company-nxml-in-tag-name-regexp
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(replace-regexp-in-string "w" company-nxml-token-regexp
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"<\\(/?w\\(?::w?\\)?\\)?\\=" t t))
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(defun company-nxml-all-completions (prefix alist)
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(let ((candidates (mapcar 'cdr alist))
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(case-fold-search nil)
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filtered)
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(when (cdar rng-open-elements)
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(push (concat "/" (cdar rng-open-elements)) candidates))
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(setq candidates (sort (all-completions prefix candidates) 'string<))
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(while candidates
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(unless (equal (car candidates) (car filtered))
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(push (car candidates) filtered))
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(pop candidates))
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(nreverse filtered)))
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(defmacro company-nxml-prepared (&rest body)
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(declare (indent 0) (debug t))
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`(let ((lt-pos (save-excursion (search-backward "<" nil t)))
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xmltok-dtd)
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(when (and lt-pos (= (rng-set-state-after lt-pos) lt-pos))
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,@body)))
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(defun company-nxml-tag (command &optional arg &rest ignored)
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(cl-case command
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(prefix (and (derived-mode-p 'nxml-mode)
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rng-validate-mode
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(company-grab company-nxml-in-tag-name-regexp 1)))
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(candidates (company-nxml-prepared
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(company-nxml-all-completions
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arg (rng-match-possible-start-tag-names))))
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(sorted t)))
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(defun company-nxml-attribute (command &optional arg &rest ignored)
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(cl-case command
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(prefix (and (derived-mode-p 'nxml-mode)
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rng-validate-mode
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(memq (char-after) '(?\ ?\t ?\n)) ;; outside word
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(company-grab rng-in-attribute-regex 1)))
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(candidates (company-nxml-prepared
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(and (rng-adjust-state-for-attribute
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lt-pos (- (point) (length arg)))
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(company-nxml-all-completions
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arg (rng-match-possible-attribute-names)))))
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(sorted t)))
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(defun company-nxml-attribute-value (command &optional arg &rest ignored)
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(cl-case command
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(prefix (and (derived-mode-p 'nxml-mode)
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rng-validate-mode
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(and (memq (char-after) '(?' ?\" ?\ ?\t ?\n)) ;; outside word
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(looking-back company-nxml-in-attribute-value-regexp nil)
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(or (match-string-no-properties 4)
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(match-string-no-properties 5)
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""))))
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(candidates (company-nxml-prepared
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(let (attr-start attr-end colon)
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(and (looking-back rng-in-attribute-value-regex lt-pos)
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(setq colon (match-beginning 2)
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attr-start (match-beginning 1)
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attr-end (match-end 1))
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(rng-adjust-state-for-attribute lt-pos attr-start)
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(rng-adjust-state-for-attribute-value
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attr-start colon attr-end)
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(all-completions
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arg (rng-match-possible-value-strings))))))))
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;;;###autoload
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(defun company-nxml (command &optional arg &rest ignored)
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"`company-mode' completion backend for `nxml-mode'."
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(interactive (list 'interactive))
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(cl-case command
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(interactive (company-begin-backend 'company-nxml))
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(prefix (or (company-nxml-tag 'prefix)
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(company-nxml-attribute 'prefix)
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(company-nxml-attribute-value 'prefix)))
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(candidates (cond
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((company-nxml-tag 'prefix)
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(company-nxml-tag 'candidates arg))
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((company-nxml-attribute 'prefix)
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(company-nxml-attribute 'candidates arg))
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((company-nxml-attribute-value 'prefix)
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(sort (company-nxml-attribute-value 'candidates arg)
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'string<))))
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(sorted t)))
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(provide 'company-nxml)
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;;; company-nxml.el ends here
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