You cannot define macros in .cljs files or .cljc files you intend to load as ClojureScript. So it's not clear to me what you are trying to demonstrate.
HTH, David On Thu, Sep 14, 2017 at 4:37 AM, 박상규 <psk...@gmail.com> wrote: > I have wondered how clojurescript compiler processes macros. > So I tested as following: > > I made dirs and files as below. > > guruma@mac cljs $ tree . > . > ├── build.clj > ├── cljs.jar > └── src > └── foo > ├── core.cljs > └── macro.cljc > > 2 directories, 4 files > > I downloaded cljs.jar using curl. > > guruma@mac cljs $ curl -LOk https://github.com/clojure/ > clojurescript/releases/download/r1.9.908/cljs.jar > > And I made build.clj, core.cljs and macro.cljc as below. > > build.clj > (require 'cljs.build.api) > > (cljs.build.api/build > "./src" > {:main 'core > :output-to "out/main.js"}) > > core.cljs > (ns foo.core > (:require-macros [macro :refer [log]])) > > (enable-console-print!) > > (log "hello, world") > > core.cljs require macro.cljc and use a macro 'log'. > > macro.cljc > (ns foo.macro) > > (defn now [] > #?(:clj (System/currentTimeMillis) > :cljs (js/Date.now))) > > (defmacro log [x] > `(println "log[" (now) "]: " ~x)) > > macro.cljc defines a macro 'log'. > And there is the helper function 'now' that has read-conditionals in its > body. > > And compile. > > guruma@mac cljs $ java -cp cljs.jar:src clojure.main build.clj > guruma@mac cljs $ > > No error and no warning. > > And I modified macro.cljc as below > > macro.cljc modified > (ns foo.macro) > > #?(:clj (defn now [] ; <== modified > (System/currentTimeMillis))) > > (defmacro log [x] > `(println "log[" (now) "]: " ~x)) > > the function 'now' is in read-conditional. > > And compile. > > guruma@mac cljs $ java -cp cljs.jar:src clojure.main build.clj > WARNING: Use of undeclared Var foo.macro/now at line 6 ./src/foo/core.cljs > > Here is a warning and it is out of question because there is no definition > of the function 'now' for clojurescript to be used for runtime. > > But what i can't understand is why there is no warning when compiling > unmodified macro.cljc. > > My questions are: > > 1) Does clojurescript compiler load macro twice for :clj and :cljs in > read-conditional when handling :require-macros? > 2) How does clojurescript compiler resolve the symbol 'now' defined in > macro.cljc? > > Thanks a lot in advance. > > > > > > > > > > > -- > Note that posts from new members are moderated - please be patient with > your first post. > --- > You received this message because you are subscribed to the Google Groups > "ClojureScript" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojurescript+unsubscr...@googlegroups.com. > To post to this group, send email to clojurescript@googlegroups.com. > Visit this group at https://groups.google.com/group/clojurescript. > -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojurescript+unsubscr...@googlegroups.com. To post to this group, send email to clojurescript@googlegroups.com. Visit this group at https://groups.google.com/group/clojurescript.
