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Code Issues 1 Releases Wiki Activity

Allow filters on templates in module/paths

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This lets us make loaders depend on file suffixes, which
lets us more efficiently use full paths.
This commit is contained in:
Calvin Rose 2019-05-25 16:13:02 -04:00
parent 4d5a95784a
commit 0280deccae
1 changed files with 40 additions and 19 deletions
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59
src/boot/boot.janet
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@ -1585,8 +1585,13 @@
:native: becomes the dynamic library file extension, usually dll
or so. Each element is a two element tuple, containing the path
template and a keyword :source, :native, or :image indicating how
require should load files found at these paths."
@[[":all:" :source]
require should load files found at these paths.\n\nA tuple can also
contain a third element, specifying a filter that prevents module/find
from searching that path template if the filter doesn't match the input
path."
@[[":all:" :source ".janet"]
[":all:" :native (if (= (os/which) :windows) ".dll" ".so")]
[":all:" :image ".jimage"]
["./:all:.janet" :source]
["./:all:/init.janet" :source]
[":sys:/:all:.janet" :source]
@ -1622,6 +1627,21 @@
(file/close f)
res))))
(def nati (if (= :windows (os/which)) "dll" "so"))
(defn- expand-path-name
[template name path]
(->> template
(string/replace ":name:" name)
(string/replace ":sys:" module/*syspath*)
(string/replace ":native:" nati)
(string/replace ":all:" path)))
(defn- mod-filter
[x path]
(case (type x)
:nil true
:string (string/has-suffix? x path)
(x path)))
(defn module/find
"Try to match a module or path name from the patterns in module/paths.
Returns a tuple (fullpath kind) where the kind is one of :source, :native,
@ -1629,25 +1649,26 @@
an error message."
[path]
(def parts (string/split "/" path))
(def name (get parts (- (length parts) 1)))
(def nati (if (= :windows (os/which)) "dll" "so"))
(defn make-full
[[p mod-kind]]
(def fullpath (->> p
(string/replace ":name:" name)
(string/replace ":sys:" module/*syspath*)
(string/replace ":native:" nati)
(string/replace ":all:" path)))
[fullpath mod-kind])
(defn check-path [x] (if (fexists (x 0)) x))
(def paths (map make-full module/paths))
(def res (find check-path paths))
(if res res [nil (string "could not find module "
path
":\n "
;(interpose "\n " (map 0 paths)))]))
(def name (last parts))
(var ret nil)
(each [p mod-kind checker] module/paths
(when (mod-filter checker path)
(def fullpath (expand-path-name p name path))
(when (fexists fullpath)
(set ret [fullpath mod-kind])
(break))))
(if ret ret
(let [expander (fn [[t _ chk]]
(when (mod-filter chk path)
(expand-path-name t name path)))
paths (filter identity (map expander module/paths))
str-parts (interpose "\n " paths)]
[nil (string "could not find module " path ":\n " ;str-parts)])))
(put _env 'fexists nil)
(put _env 'nati nil)
(put _env 'expand-path-name nil)
(put _env 'mod-filter nil)
(def module/cache
"Table mapping loaded module identifiers to their environments."