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;;; cider-resolve.el --- Resolve clojure symbols according to current nREPL connection
;; Copyright © 2015-2018 Bozhidar Batsov, Artur Malabarba and CIDER contributors
;; Author: Artur Malabarba <bruce.connor.am@gmail.com>
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; The ns cache is a dict of namespaces stored in the connection buffer. This
;; file offers functions to easily get information about variables from this
;; cache, given the variable's name and the file's namespace. This
;; functionality is similar to that offered by the `cider-var-info' function
;; (and others). The difference is that all functions in this file operate
;; without contacting the server (they still rely on an active connection
;; buffer, but no messages are actually exchanged).
;; For this reason, the functions here are well suited for very
;; performance-sentitive operations, such as font-locking or
;; indentation. Meanwhile, operations like code-jumping are better off
;; communicating with the middleware, just in the off chance that the cache is
;; outdated.
;; Below is a typical entry on this cache dict. Note that clojure.core symbols
;; are excluded from the refers to save space.
;; "cider.nrepl.middleware.track-state"
;; (dict "aliases"
;; (dict "cljs" "cider.nrepl.middleware.util.cljs"
;; "misc" "cider.nrepl.middleware.util.misc"
;; "set" "clojure.set")
;; "interns" (dict a
;; "assoc-state" (dict "arglists"
;; (("response"
;; (dict "as" "msg" "keys"
;; ("session")))))
;; "filter-core" (dict "arglists"
;; (("refers")))
;; "make-transport" (dict "arglists"
;; (((dict "as" "msg" "keys"
;; ("transport")))))
;; "ns-as-map" (dict "arglists"
;; (("ns")))
;; "ns-cache" (dict)
;; "relevant-meta" (dict "arglists"
;; (("var")))
;; "update-vals" (dict "arglists"
;; (("m" "f")))
;; "wrap-tracker" (dict "arglists"
;; (("handler"))))
;; "refers" (dict "set-descriptor!" "#'clojure.tools.nrepl.middleware/set-descriptor!"))
;;; Code:
(require 'cider-client)
(require 'nrepl-dict)
(require 'cider-util)
(defvar cider-repl-ns-cache)
(defun cider-resolve--get-in (&rest keys)
"Return (nrepl-dict-get-in cider-repl-ns-cache KEYS)."
(when-let* ((conn (cider-current-repl)))
(with-current-buffer conn
(nrepl-dict-get-in cider-repl-ns-cache keys))))
(defun cider-resolve-alias (ns alias)
"Return the namespace that ALIAS refers to in namespace NS.
If it doesn't point anywhere, returns ALIAS."
(or (cider-resolve--get-in ns "aliases" alias)
alias))
(defconst cider-resolve--prefix-regexp "\\`\\(?:#'\\)?\\([^/]+\\)/")
(defun cider-resolve-var (ns var)
"Return a dict of the metadata of a clojure var VAR in namespace NS.
VAR is a string.
Return nil only if VAR cannot be resolved."
(let* ((var-ns (when (string-match cider-resolve--prefix-regexp var)
(cider-resolve-alias ns (match-string 1 var))))
(name (replace-regexp-in-string cider-resolve--prefix-regexp "" var)))
(or
(cider-resolve--get-in (or var-ns ns) "interns" name)
(unless var-ns
;; If the var had no prefix, it might be referred.
(if-let* ((referal (cider-resolve--get-in ns "refers" name)))
(cider-resolve-var ns referal)
;; Or it might be from core.
(unless (equal ns "clojure.core")
(cider-resolve-var "clojure.core" name)))))))
(defun cider-resolve-core-ns ()
"Return a dict of the core namespace for current connection.
This will be clojure.core or cljs.core depending on the return value of the
function `cider-repl-type'."
(when-let* ((repl (cider-current-repl)))
(with-current-buffer repl
(cider-resolve--get-in (if (equal cider-repl-type "cljs")
"cljs.core"
"clojure.core")))))
(defun cider-resolve-ns-symbols (ns)
"Return a plist of all valid symbols in NS.
Each entry's value is the metadata of the var that the symbol refers to.
NS can be the namespace name, or a dict of the namespace itself."
(when-let* ((dict (if (stringp ns)
(cider-resolve--get-in ns)
ns)))
(nrepl-dbind-response dict (interns refers aliases)
(append (cdr interns)
(nrepl-dict-flat-map (lambda (alias namespace)
(nrepl-dict-flat-map (lambda (sym meta)
(list (concat alias "/" sym) meta))
(cider-resolve--get-in namespace "interns")))
aliases)))))
(provide 'cider-resolve)
;;; cider-resolve.el ends here
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