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lib/load-file-once: basic support for multiple imports
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@ -17,9 +17,6 @@ However, here are some guidelines.
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is not possible, for example for macros, give them a name starting
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with an underscore.
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- Support successive imports safely by giving the same definitions
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again.
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If a module provides tests, you may run against an implementation IMPL
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with these commands.
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```
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@ -27,3 +24,12 @@ make IMPL^stepA
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cd tests
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python ../runtest.py lib/MODULE.mal ../IMPL/run
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```
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Users and implementors should use the following syntax in order to
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ensure that the same file is only loaded once.
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```
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/foo.mal")
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(load-file-once "../lib/bar.mal")
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```
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18
lib/load-file-once.mal
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18
lib/load-file-once.mal
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@ -0,0 +1,18 @@
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;; Like load-file, but will never load the same path twice.
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;; This file is normally loaded with `load-file`, so it needs a
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;; different mechanism to neutralize multiple inclusions of
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;; itself. Moreover, the file list should never be reset.
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(def! load-file-once
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(try*
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load-file-once
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(catch* _
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(let* [seen (atom {"../lib/load-file-once.mal" nil})]
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(fn* [filename]
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(if (not (contains? @seen filename))
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(do
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(swap! seen assoc filename nil)
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(load-file filename))))))))
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nil
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@ -1,6 +1,7 @@
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;; Mesure performances.
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(load-file "../lib/trivial.mal") ; gensym inc
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/trivial.mal") ; gensym inc
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;; Evaluate an expression, but report the time spent
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(defmacro! time
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@ -1,6 +1,7 @@
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;; Iteration on evaluations interpreted as boolean values.
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(load-file "../lib/trivial.mal") ; gensym
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/trivial.mal") ; gensym
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;; `(cond test1 result1 test2 result2 .. testn resultn)`
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;; is rewritten (in the step files) as
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@ -1,6 +1,7 @@
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;; Composition of partially applied functions.
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(load-file "../lib/reducers.mal") ; reduce
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/reducers.mal") ; reduce
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;; Rewrite x (a a1 a2) .. (b b1 b2) as
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;; (b (.. (a x a1 a2) ..) b1 b2)
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1
tests/lib/load-file-once-inc.mal
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1
tests/lib/load-file-once-inc.mal
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@ -0,0 +1 @@
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(swap! counter (fn* [x] (+ 1 x)))
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38
tests/lib/load-file-once.mal
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38
tests/lib/load-file-once.mal
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@ -0,0 +1,38 @@
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(def! counter (atom 0))
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;=>(atom 0)
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;; The counter is increased by each `load-file`.
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(load-file "../tests/lib/load-file-once-inc.mal")
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;=>1
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(load-file "../tests/lib/load-file-once-inc.mal")
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;=>2
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;; load-file-once is available
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(load-file "../lib/load-file-once.mal")
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;=>nil
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;; First import actually calls `load-file`.
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(load-file-once "../tests/lib/load-file-once-inc.mal")
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;=>3
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;; Later imports do nothing.
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(load-file-once "../tests/lib/load-file-once-inc.mal")
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;=>nil
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@counter
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;=>3
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;; Loading the module twice does not reset its memory.
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(load-file "../lib/load-file-once.mal")
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;=>nil
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(load-file-once "../tests/lib/load-file-once-inc.mal")
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;=>nil
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@counter
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;=>3
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;; even if done with itself
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(load-file-once "../lib/load-file-once.mal")
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;=>nil
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(load-file-once "../tests/lib/load-file-once-inc.mal")
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;=>nil
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@counter
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;=>3
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@ -1,6 +1,6 @@
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(load-file "../tests/computations.mal")
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;=>nil
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(load-file "../lib/memoize.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../tests/computations.mal")
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(load-file-once "../lib/memoize.mal")
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;=>nil
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(def! N 32)
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@ -1,4 +1,5 @@
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(load-file "../lib/pprint.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/pprint.mal")
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;=>nil
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(pprint '(7 8 9 "ten" [11 12 [13 14]] 15 16))
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@ -1,4 +1,5 @@
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(load-file "../lib/protocols.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/protocols.mal")
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;=>nil
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;; Testing find-type for normal objects.
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@ -1,4 +1,5 @@
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(load-file "../lib/reducers.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/reducers.mal")
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;=>nil
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;; Testing reduce
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(load-file "../lib/test_cascade.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/test_cascade.mal")
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;=>nil
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;; Testing or
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@ -1,4 +1,5 @@
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(load-file "../lib/threading.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/threading.mal")
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;=>nil
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;; Testing -> macro
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(load-file "../lib/trivial.mal")
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/trivial.mal")
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;=>nil
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(inc 12)
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@ -1,6 +1,7 @@
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(load-file "../lib/threading.mal") ; ->
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(load-file "../lib/perf.mal") ; time
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(load-file "../lib/test_cascade.mal") ; or
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/threading.mal") ; ->
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(load-file-once "../lib/perf.mal") ; time
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(load-file-once "../lib/test_cascade.mal") ; or
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;;(prn "Start: basic macros performance test")
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(load-file "../tests/computations.mal") ; fib sumdown
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(load-file "../lib/perf.mal") ; time
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../tests/computations.mal") ; fib sumdown
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(load-file-once "../lib/perf.mal") ; time
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;;(prn "Start: basic math/recursion test")
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(load-file "../lib/threading.mal") ; ->
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(load-file "../lib/perf.mal") ; run-fn-for
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(load-file "../lib/test_cascade.mal") ; or
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(load-file "../lib/load-file-once.mal")
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(load-file-once "../lib/threading.mal") ; ->
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(load-file-once "../lib/perf.mal") ; run-fn-for
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(load-file-once "../lib/test_cascade.mal") ; or
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;;(prn "Start: basic macros/atom test")
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