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130 righe
5.8 KiB
130 righe
5.8 KiB
;;; cider-resolve.el --- Resolve clojure symbols according to current nREPL connection
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;; Copyright © 2015-2019 Bozhidar Batsov, Artur Malabarba and CIDER contributors
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;; Author: Artur Malabarba <bruce.connor.am@gmail.com>
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;; This program 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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;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; The ns cache is a dict of namespaces stored in the connection buffer. This
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;; file offers functions to easily get information about variables from this
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;; cache, given the variable's name and the file's namespace. This
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;; functionality is similar to that offered by the `cider-var-info' function
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;; (and others). The difference is that all functions in this file operate
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;; without contacting the server (they still rely on an active connection
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;; buffer, but no messages are actually exchanged).
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;; For this reason, the functions here are well suited for very
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;; performance-sentitive operations, such as font-locking or
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;; indentation. Meanwhile, operations like code-jumping are better off
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;; communicating with the middleware, just in the off chance that the cache is
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;; outdated.
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;; Below is a typical entry on this cache dict. Note that clojure.core symbols
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;; are excluded from the refers to save space.
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;; "cider.nrepl.middleware.track-state"
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;; (dict "aliases"
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;; (dict "cljs" "cider.nrepl.middleware.util.cljs"
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;; "misc" "cider.nrepl.middleware.util.misc"
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;; "set" "clojure.set")
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;; "interns" (dict a
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;; "assoc-state" (dict "arglists"
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;; (("response"
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;; (dict "as" "msg" "keys"
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;; ("session")))))
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;; "filter-core" (dict "arglists"
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;; (("refers")))
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;; "make-transport" (dict "arglists"
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;; (((dict "as" "msg" "keys"
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;; ("transport")))))
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;; "ns-as-map" (dict "arglists"
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;; (("ns")))
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;; "ns-cache" (dict)
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;; "relevant-meta" (dict "arglists"
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;; (("var")))
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;; "update-vals" (dict "arglists"
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;; (("m" "f")))
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;; "wrap-tracker" (dict "arglists"
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;; (("handler"))))
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;; "refers" (dict "set-descriptor!" "#'nrepl.middleware/set-descriptor!"))
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;;; Code:
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(require 'cider-client)
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(require 'nrepl-dict)
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(require 'cider-util)
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(defvar cider-repl-ns-cache)
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(defun cider-resolve--get-in (&rest keys)
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"Return (nrepl-dict-get-in cider-repl-ns-cache KEYS)."
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(when-let* ((conn (cider-current-repl)))
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(with-current-buffer conn
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(nrepl-dict-get-in cider-repl-ns-cache keys))))
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(defun cider-resolve-alias (ns alias)
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"Return the namespace that ALIAS refers to in namespace NS.
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If it doesn't point anywhere, returns ALIAS."
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(or (cider-resolve--get-in ns "aliases" alias)
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alias))
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(defconst cider-resolve--prefix-regexp "\\`\\(?:#'\\)?\\([^/]+\\)/")
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(defun cider-resolve-var (ns var)
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"Return a dict of the metadata of a clojure var VAR in namespace NS.
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VAR is a string.
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Return nil only if VAR cannot be resolved."
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(let* ((var-ns (when (string-match cider-resolve--prefix-regexp var)
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(cider-resolve-alias ns (match-string 1 var))))
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(name (replace-regexp-in-string cider-resolve--prefix-regexp "" var)))
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(or
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(cider-resolve--get-in (or var-ns ns) "interns" name)
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(unless var-ns
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;; If the var had no prefix, it might be referred.
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(if-let* ((referral (cider-resolve--get-in ns "refers" name)))
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(cider-resolve-var ns referral)
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;; Or it might be from core.
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(unless (equal ns "clojure.core")
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(cider-resolve-var "clojure.core" name)))))))
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(defun cider-resolve-core-ns ()
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"Return a dict of the core namespace for current connection.
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This will be clojure.core or cljs.core depending on the return value of the
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function `cider-repl-type'."
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(when-let* ((repl (cider-current-repl)))
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(with-current-buffer repl
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(cider-resolve--get-in (if (eq cider-repl-type 'cljs)
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"cljs.core"
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"clojure.core")))))
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(defun cider-resolve-ns-symbols (ns)
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"Return a plist of all valid symbols in NS.
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Each entry's value is the metadata of the var that the symbol refers to.
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NS can be the namespace name, or a dict of the namespace itself."
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(when-let* ((dict (if (stringp ns)
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(cider-resolve--get-in ns)
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ns)))
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(nrepl-dbind-response dict (interns refers aliases)
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(append (cdr interns)
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(nrepl-dict-flat-map (lambda (alias namespace)
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(nrepl-dict-flat-map (lambda (sym meta)
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(list (concat alias "/" sym) meta))
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(cider-resolve--get-in namespace "interns")))
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aliases)))))
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(provide 'cider-resolve)
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;;; cider-resolve.el ends here
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