Re: [ClojureScript] Is this a ClojureScript compiler bug or intended result?
The compiler emits to *out* during compilation. You will need to print to
some other output stream like *err* for now.
David
On Mon, Aug 13, 2018 at 2:41 AM Philos Kim wrote:
> I wrote a macro in ClojureScript and wanted to test the macro by using
> println function like this,
>
> ;; qna/macro.clj
> (ns qna.macro)
>
> (defmacro my-add [a b]
> (println "a =" a "b =" b) ; <-- Here
> `(+ ~a ~b))
>
>
> ;; qna/main.cljs
> (ns qna.main
> (:require-macros [qna.macro :refer [my-add]]))
>
> (defn ^:export main []
> (my-add 2 3))
>
>
> resources/public/index.html and project.clj are like the following.
>
> ;; resources/public/index.html
>
>
>
>
> QnA Demo
>
>
>
> QnA Demo
>
>
>
> qna.main.main();
>
>
>
>
> ;; project.clj
> (defproject qna "0.1.0-SNAPSHOT"
> :dependencies [[org.clojure/clojure "1.9.0"]
> [org.clojure/clojurescript "1.10.339"]]
> :min-lein-version "2.6.0"
> :plugins [[lein-cljsbuild "1.1.7"]
> [lein-figwheel "0.5.16"]]
> :clean-targets ^{:protect false}
> ["target"
>"resources/public/js/out"
>"resources/public/js/main.js"]
> :cljsbuild
> {:builds
>[{:id "dev"
> :source-paths ["src"]
> :compiler {:main qna.main
> :output-to "resources/public/js/main.js"
> :output-dir "resources/public/js/out/"
> :asset-path "js/out/"
> :optimizations :none
> :source-map true
> :pretty-print true} }]})
>
> When I open the above .html file in the browser, I encounter the following
> error.
>
> Uncaught SyntaxError: Unexpected identifier in main.js:4
>
> And the compiled main.js file is like this.
>
> // Compiled by ClojureScript 1.10.339 {}
> goog.provide('qna.main');
> goog.require('cljs.core');
> a = 2 b = 3 // <-- embedded printed result
> qna.main.main = (function qna$main$main(){
> return ((2) + (3));
> });
> goog.exportSymbol('qna.main.main', qna.main.main);
>
> //# sourceMappingURL=main.js.map
>
>
> To sum up, whenever I evalute (println ...) within a macro, the printed
> result doesn't go to the REPL but is embedded into the compiled .js file.
>
> If this is a bug of ClojureScript, I will register this error in the
> ClojureScript JIRA.
>
>
>
>
>
> --
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>
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[ClojureScript] Re: Is this a ClojureScript compiler bug or intended result?
You can use `cljs.util/debug-prn` if you need to print during macro
expansion.
Whether or not this should be called a bug I don't know.
On Monday, August 13, 2018 at 8:41:05 AM UTC+2, Philos Kim wrote:
>
> I wrote a macro in ClojureScript and wanted to test the macro by using
> println function like this,
>
> ;; qna/macro.clj
> (ns qna.macro)
>
> (defmacro my-add [a b]
> (println "a =" a "b =" b) ; <-- Here
> `(+ ~a ~b))
>
>
> ;; qna/main.cljs
> (ns qna.main
> (:require-macros [qna.macro :refer [my-add]]))
>
> (defn ^:export main []
> (my-add 2 3))
>
>
> resources/public/index.html and project.clj are like the following.
>
> ;; resources/public/index.html
>
>
>
>
> QnA Demo
>
>
>
> QnA Demo
>
>
>
> qna.main.main();
>
>
>
>
> ;; project.clj
> (defproject qna "0.1.0-SNAPSHOT"
> :dependencies [[org.clojure/clojure "1.9.0"]
> [org.clojure/clojurescript "1.10.339"]]
> :min-lein-version "2.6.0"
> :plugins [[lein-cljsbuild "1.1.7"]
> [lein-figwheel "0.5.16"]]
> :clean-targets ^{:protect false}
> ["target"
>"resources/public/js/out"
>"resources/public/js/main.js"]
> :cljsbuild
> {:builds
>[{:id "dev"
> :source-paths ["src"]
> :compiler {:main qna.main
> :output-to "resources/public/js/main.js"
> :output-dir "resources/public/js/out/"
> :asset-path "js/out/"
> :optimizations :none
> :source-map true
> :pretty-print true} }]})
>
> When I open the above .html file in the browser, I encounter the following
> error.
>
> Uncaught SyntaxError: Unexpected identifier in main.js:4
>
> And the compiled main.js file is like this.
>
> // Compiled by ClojureScript 1.10.339 {}
> goog.provide('qna.main');
> goog.require('cljs.core');
> a = 2 b = 3 // <-- embedded printed result
> qna.main.main = (function qna$main$main(){
> return ((2) + (3));
> });
> goog.exportSymbol('qna.main.main', qna.main.main);
>
> //# sourceMappingURL=main.js.map
>
>
> To sum up, whenever I evalute (println ...) within a macro, the printed
> result doesn't go to the REPL but is embedded into the compiled .js file.
>
> If this is a bug of ClojureScript, I will register this error in the
> ClojureScript JIRA.
>
>
>
>
>
>
--
Note that posts from new members are moderated - please be patient with your
first post.
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[ClojureScript] Is this a ClojureScript compiler bug or intended result?
I wrote a macro in ClojureScript and wanted to test the macro by using
println function like this,
;; qna/macro.clj
(ns qna.macro)
(defmacro my-add [a b]
(println "a =" a "b =" b) ; <-- Here
`(+ ~a ~b))
;; qna/main.cljs
(ns qna.main
(:require-macros [qna.macro :refer [my-add]]))
(defn ^:export main []
(my-add 2 3))
resources/public/index.html and project.clj are like the following.
;; resources/public/index.html
QnA Demo
QnA Demo
qna.main.main();
;; project.clj
(defproject qna "0.1.0-SNAPSHOT"
:dependencies [[org.clojure/clojure "1.9.0"]
[org.clojure/clojurescript "1.10.339"]]
:min-lein-version "2.6.0"
:plugins [[lein-cljsbuild "1.1.7"]
[lein-figwheel "0.5.16"]]
:clean-targets ^{:protect false}
["target"
"resources/public/js/out"
"resources/public/js/main.js"]
:cljsbuild
{:builds
[{:id "dev"
:source-paths ["src"]
:compiler {:main qna.main
:output-to "resources/public/js/main.js"
:output-dir "resources/public/js/out/"
:asset-path "js/out/"
:optimizations :none
:source-map true
:pretty-print true} }]})
When I open the above .html file in the browser, I encounter the following
error.
Uncaught SyntaxError: Unexpected identifier in main.js:4
And the compiled main.js file is like this.
// Compiled by ClojureScript 1.10.339 {}
goog.provide('qna.main');
goog.require('cljs.core');
a = 2 b = 3 // <-- embedded printed result
qna.main.main = (function qna$main$main(){
return ((2) + (3));
});
goog.exportSymbol('qna.main.main', qna.main.main);
//# sourceMappingURL=main.js.map
To sum up, whenever I evalute (println ...) within a macro, the printed
result doesn't go to the REPL but is embedded into the compiled .js file.
If this is a bug of ClojureScript, I will register this error in the
ClojureScript JIRA.
--
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.
