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131 rader
5.0 KiB
131 rader
5.0 KiB
;;; ess-r-xref.el --- An xref backend for R. -*- lexical-binding: t -*-
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;;
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;; Author: Aaron Jacobs
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;; Created: 21 January 2018
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;; Maintainer: ESS-core <ESS-core@r-project.org>
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;;
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;; Keywords: languages, statistics, xref
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;;
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;; This file is part of ESS.
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;;
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;; This file 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 2, or (at your option)
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;; any later version.
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;;
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;; This file 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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;;
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;; A copy of the GNU General Public License is available at
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;; https://www.r-project.org/Licenses/
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;;; Commentary:
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;; This file contains an xref backend for `ess-r-mode'.
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;;; Code:
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(require 'xref)
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(require 'ess-inf)
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(require 'ess-r-package)
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(require 'ess-tracebug)
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;; Silence the byte compiler. OK because this file is only loaded by ess-r-mode.
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(declare-function inferior-ess-r-force "ess-r-mode")
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(defvar ess-r-xref-pkg-sources nil
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"Alist of R package->directory associations.
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This variable is used as a cache of package->directory
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associations, but could be used by the users for a more refined
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control of package locations than `ess-r-package-library-paths'.")
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(defun ess-r-xref-backend ()
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"An `xref-backend-functions' implementation for `ess-r-mode'.
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R's xref backend searches for `ess-r-package-library-paths' when
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srcrefs point to temporary locations."
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'ess-r)
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(cl-defmethod xref-backend-identifier-at-point ((_backend (eql ess-r)))
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(let ((sym (ess-symbol-at-point)))
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(when sym
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(symbol-name sym))))
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(cl-defmethod xref-backend-definitions ((_backend (eql ess-r)) symbol)
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(let ((xref (ess-r-xref--xref symbol)))
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(when xref
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(list xref))))
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(cl-defmethod xref-backend-apropos ((_backend (eql ess-r)))
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;; Not yet supported.
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nil)
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(cl-defmethod xref-backend-identifier-completion-table ((_backend (eql ess-r)))
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(inferior-ess-r-force)
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(ess-get-words-from-vector ".ess_all_functions()\n"))
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(defun ess-r-xref--srcref (symbol)
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(inferior-ess-r-force)
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;; Look for `symbol' inside the package namespace
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(let* ((pkg (ess-r-package-name))
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(pkg (if pkg
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(concat "\"" pkg "\"")
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"NULL")))
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(with-current-buffer (ess-command (format ".ess_srcref(\"%s\", %s)\n" symbol pkg))
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(goto-char (point-min))
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(when (re-search-forward "(" nil 'noerror)
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(goto-char (match-beginning 0))
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(read (current-buffer))))))
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(defun ess-r-xref--pkg-srcfile (symbol r-src-file)
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"Look in the source directory of the R package containing symbol SYMBOL for R-SRC-FILE."
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(let* ((env-name (ess-string-command (format ".ess_fn_pkg(\"%s\")\n" symbol)))
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(pkg (if (string-equal env-name "")
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(user-error "Can't find package for symbol %s" symbol)
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env-name))
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(dir (or (assoc-default pkg ess-r-xref-pkg-sources)
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(cond ((stringp ess-r-package-library-paths)
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(expand-file-name pkg ess-r-package-library-paths))
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((listp ess-r-package-library-paths)
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(cl-loop for d in ess-r-package-library-paths
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for p = (expand-file-name pkg d)
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when (file-exists-p p) return p))
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(t (user-error "Invalid value of `ess-r-package-library-paths'")))))
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(file (when dir (expand-file-name r-src-file dir))))
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(when file
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(unless (file-readable-p file)
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(user-error "Can't read %s" file))
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;; Cache package's source directory.
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(unless (assoc pkg ess-r-xref-pkg-sources)
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(push `(,pkg . ,dir) ess-r-xref-pkg-sources))
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file)))
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(defun ess-r-xref--xref (symbol)
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"Create an xref for the source file reference of R symbol SYMBOL."
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(let ((ref (ess-r-xref--srcref symbol)))
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(when ref
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(let ((file (nth 0 ref))
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(line (nth 1 ref))
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(col (nth 2 ref)))
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(or
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;; 1) Result of ESS evaluation
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(let* ((ess-ref (gethash file ess--srcrefs))
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(ess-buff (when ess-ref (ess--dbg-find-buffer (car ess-ref)))))
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(when ess-buff
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;; FIXME: this breaks when eval is on larger spans than function
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(xref-make symbol (xref-make-buffer-location ess-buff (nth 2 ess-ref)))))
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;; 2) Actual file location
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(when (file-readable-p file)
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(xref-make symbol (xref-make-file-location file line col)))
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;; 3) Temporary sources - truncate and locate in ess-r-package-library-paths
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(when (string-match "/\\(R/.*\\)$" file)
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(let ((pkg-file (ess-r-xref--pkg-srcfile symbol (match-string 1 file))))
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(when pkg-file
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(xref-make symbol (xref-make-file-location
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(expand-file-name pkg-file) line col))))))))))
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(provide 'ess-r-xref)
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;;; ess-r-xref.el ends here
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