; Which library a tag or filter is registered in.
;
; The grammar accepts these whether or not a "{% load %}" precedes them: an
; engine may preload a library through its "builtins" option, and Django
; resolves a name against the libraries loaded *so far*, which is a question
; about the order of nodes rather than about how the template parses. A tool
; that wants to report a missing load can run this query and compare positions
; itself, and should skip the check for a library the engine preloads.
;
; Loading is per file and positional: "{% load %}" does not reach a template
; that extends or includes this one, and a tag written before the load is an
; error even though the load is in the same file.

; Each pattern captures the name a library registered, rather than the node it
; heads, so that the capture is both the name to look up and the range to
; report. A paired tag names the opening tag only.

(static
  tag: ("static") @library.static)

(get_static_prefix
  tag: ("get_static_prefix") @library.static)

(get_media_prefix
  tag: ("get_media_prefix") @library.static)

(localize_group
  tag: ("localize") @library.l10n)

(filter
  name: [
    ("localize")
    ("unlocalize")] @library.l10n)

(localtime_group
  tag: ("localtime") @library.tz)

(timezone_group
  tag: ("timezone") @library.tz)

(get_current_timezone
  tag: ("get_current_timezone") @library.tz)

(filter
  name: [
    ("localtime")
    ("timezone")
    ("utc")] @library.tz)

; "{% load static %}" makes every name in the library available; "{% load
; static from staticfiles %}" makes only the names listed available.
(load
  (library) @load.library)

(load
  (identifier) @load.name)