xref backend using phpactor

Thanks Nicolas Petton for inspiring this with your work on xref-js2.

Cask

@@ -4,6 +4,7 @@
 
 (package-file "phpactor.el")
 (package-file "company-phpactor.el")
+(package-file "phpactor-xref.el")
 
 (development
  (depends-on "php-mode")

phpactor-xref.el

@@ -0,0 +1,90 @@
+;;; phpactor-xref.el --- phpactor.el xref backend -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018  Friends of Emacs-PHP development
+
+;; Author: Mikael Kermorgant <[email protected]>
+;; Created: 05 Aug 2019
+;; Version: 0.1.0
+;; Keywords: tools, php
+;; Package-Requires: ((phpactor "0.1.0")(seq "2"))
+;; URL: https://github.com/emacs-php/phpactor.el
+;; License: GPL-3.0-or-later
+
+;; 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 of the License, 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;; xref backend using Phpactor.
+;; Inspiration comes from Nicolas Petton's https://github.com/NicolasPetton/xref-js2
+
+;;; Code:
+(require 'xref)
+(require 'seq)
+
+;;;###autoload
+(defun phpactor-xref-backend ()
+  "Xref-phpactor backend for Xref."
+  'phpactor-xref)
+
+(cl-defmethod xref-backend-references ((_backend (eql phpactor-xref)) symbol)
+  (phpactor-xref--xref-find-references))
+
+(cl-defmethod xref-backend-definitions ((_backend (eql phpactor-xref)) symbol)
+  (phpactor-xref--find-definitions))
+
+(cl-defmethod xref-backend-identifier-completion-table ((_backend (eql phpactor-xref)))
+  "Return a list of terms for completions taken from the symbols in the current buffer.
+The current implementation returns all the words in the buffer,
+which is really sub optimal."
+  (list (symbol-at-point)))
+
+(defun phpactor-xref--xref-find-references ()
+  "Return a list of reference candidates."
+  (seq-map (lambda (candidate)
+             (phpactor-xref--make-xref candidate))
+           (phpactor-xref--find-candidates)))
+
+(defun phpactor-xref--find-definitions()
+  "Return a list of candidates matching SYMBOL."
+  (seq-map (lambda (candidate)
+             (phpactor-xref--make-xref candidate))
+           (phpactor-xref--find-candidates)))
+
+(defun phpactor-xref--make-xref (candidate)
+  "Return a new Xref object built from CANDIDATE."
+  (xref-make (map-elt candidate 'match)
+             (xref-make-file-location (map-elt candidate 'file)
+                                      (map-elt candidate 'line)
+                                      (map-elt candidate 'col))))
+
+(defun phpactor-xref--find-candidates ()
+  "Fetch references and return a list."
+  (phpactor--find-references)
+  (let ((current-references phpactor-references)
+        matches)
+    (dolist (file-reference current-references)
+      (let ((path (plist-get file-reference :file)))
+        (dolist (reference (plist-get file-reference :references))
+          (when path
+            (push  (list (cons 'file path)
+                                 (cons 'line (plist-get reference :line_no))
+                                 (cons 'col (plist-get reference :col_no))
+                                 (cons 'match (plist-get reference :line))
+                                        ;; (cons 'symbol symbol)
+                                        ;; (cons 'match match)
+                                 )
+                   matches)))))
+    matches))
+
+(provide 'phpactor-xref)
+;;; phpactor-xref.el ends here

phpactor.el

@@ -72,6 +72,11 @@
   "If non-nil, use native json parsing if available."
   :group 'phpactor
   :type 'boolean)
+
+(defcustom phpactor-use-xref t
+  "Defines phpactor xref backend."
+  :group 'phpactor
+  :type 'boolean)
 
 ;; Variables
 (defvar phpactor--debug nil)
@@ -730,6 +735,12 @@ function."
     (apply #'phpactor-action-dispatch (phpactor--rpc "references" arguments))
     (phpactor-list-references)))
 
+;;;###autoload
+(defun phpactor--find-references ()
+  "Execute Phpactor RPC references action to find references."
+  (let ((arguments (phpactor--command-argments :source :path :offset)))
+    (apply #'phpactor-action-dispatch (phpactor--rpc "references" arguments))))
+
 ;;;###autoload
 (defun phpactor-replace-references ()
   "Execute Phpactor RPC references action command to replace references."
@@ -821,5 +832,8 @@ function."
   (let ((arguments (phpactor--command-argments :source :path :offset)))
     (apply #'phpactor-action-dispatch (phpactor--rpc "change_visibility" arguments))))
 
+(autoload 'phpactor-xref-backend "phpactor-xref"
+  "Phpactor backend for Xref.")
+
 (provide 'phpactor)
 ;;; phpactor.el ends here