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Code Issues 1 Releases Wiki Activity

Add unification to match macro.

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Using a quote on a symbol prevents the match
macro from trying to create a binding to it, and
instead tells it that we are binding to a symbol
that is already in scope.
This commit is contained in:
Calvin Rose 2019-05-16 10:05:54 -04:00
parent 30cb01e2f0
commit 7d49e3e6f1
2 changed files with 8 additions and 5 deletions
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2
Makefile
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@ -252,7 +252,7 @@ dist: build/janet-dist.tar.gz
build/janet-%.tar.gz: $(JANET_TARGET) \
src/include/janet.h src/include/janetconf.h \
janet.1 LICENSE CONTRIBUTING.md $(JANET_LIBRARY) \
janet.1 LICENSE CONTRIBUTING.md $(JANET_LIBRARY) $(JANET_STATIC_LIBRARY) \
build/doc.html README.md build/janet.c
tar -czvf $@ $^

11
src/boot/boot.janet
View File

@ -1127,10 +1127,13 @@
~(if (= nil (def ,pattern ,expr)) ,sentinel ,(onmatch))))
(tuple? pattern)
(match-1
(get pattern 0) expr
(fn []
~(if (and ,;(tuple/slice pattern 1)) ,(onmatch) ,sentinel)) seen)
(if (and (= (pattern 0) 'quote) (symbol? (pattern 1)))
# Unification with external values
~(if (= ,(pattern 1) ,expr) ,(onmatch) ,sentinel)
(match-1
(get pattern 0) expr
(fn []
~(if (and ,;(tuple/slice pattern 1)) ,(onmatch) ,sentinel)) seen))
(array? pattern)
(do