cljs.analyzer: how to use it?

[Yehonathan Sharvit]

Following this (great) talk by https://www.youtube.com/watch?v=Elg17s_nwDg
I tried to comile cljs in cljs.

The following code didn't work

(->> (cljs.tools.reader/read-string "(inc 2)")
(cljs.analyzer/analyze {}))

I got a js error:

Uncaught #error {:message "Cannot read property 'findInternedVar' of null", :data {:tag :cljs/analysis-error}

Who could help?

[Maria Geller]

For evaluating ClojureScript in ClojureScript you need to use the cljs.js namespace (https://github.com/cljsinfo/cljs-api-docs/blob/catalog/refs/library/cljs.js.md). Here is a gist with a small example: https://gist.github.com/mneise/36c0bbae83b19c056781

[Yehonathan Sharvit]

Thanks Maria.

It works fine.

What is the level of support for macros?

I tried to eval/compile with custom macros but it didn't work:

(defmacro my [n]

 n)

(macroexpand '(my 3)) 

eval returns: (my 3)

compile returns: cljs.user.my = (function cljs$user$my(_AMPERSAND_form,_AMPERSAND_env,n){ return n; }); cljs.user.my.cljs$lang$macro = true; cljs.core.list(new cljs.core.Symbol(null,"my","my",584828258,null),3);

So I tried to run macroexpand on a clojure macro (macroexpand  '(and 3 4))

It works:

eval returns: 

(let* [and__19224__auto__ 3] (if and__19224__auto__ (cljs.core$macros/and 4) and__19224__auto__))

compile returns: 

cljs.core.list(new cljs.core.Symbol(null,"let*","let*",1920721458,null),new cljs.core.PersistentVector(null, 2, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"and__19224__auto__","and__19224__auto__",-1924552325,null),3], null),cljs.core.list(new cljs.core.Symbol(null,"if","if",1181717262,null),new cljs.core.Symbol(null,"and__19224__auto__","and__19224__auto__",-1924552325,null),cljs.core.list(new cljs.core.Symbol("cljs.core$macros","and","cljs.core$macros/and",48320334,null),4),new cljs.core.Symbol(null,"and__19224__auto__","and__19224__auto__",-1924552325,null)));

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[bpb...@gmail.com]

can I ask, how do you evaluate expressions that refer to local bindings ? Say I have an expression (+ x 4) that refers to x (not bound in the expression) and I create a new expression from it that puts it inside a (let [x 5] (+ x 4)) say, I get an error if I try to evaluate this.

[Yehonathan Sharvit]

`(let [x 5] (+ x 4))`  works fine for me.

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[bpb...@gmail.com]

On Tuesday, December 1, 2015 at 12:09:33 PM UTC, Yehonathan Sharvit wrote:
> `(let [x 5] (+ x 4))`  works fine for me.
>

sorry I should have been clearer - I meant where the value is something passed in:

`(let [x# ~y] (+ x 4))

[Mike Fikes]

There are a couple of ways to make use of macros in cljs.js.

One would be to put the macros in a namespace and use cljs.js to require that namespace as a macros namespace. This would involve using cljs.js/*load-fn* to provide the source in the macro namespace. Then you can subsequently use cljs.js to compile and evaluate code that makes use of those macros.

Another approach, if you are just looking to expand a macro is detailed in this post:
http://blog.fikesfarm.com/posts/2015-09-05-runtime-macroexpand.html

[Andray Shotkin]

Hi, Maria!

I tried to eval clojurescript form in clojurescript via eval-str and it works for code without functions.
If i add 'defn' form then error occurs. I debugged it and first of all following thing is suspicious: during analyzing defn we are dispatched into core$macros.js functions where .core.cst$sym$cljs$core$macros_SLASH_fn is not defined but similar cljs.core.cst$sym$cljs$core_SLASH_fn symbol is defined in constants_table.js
Can you advice me where i can have a look to resolve my problem?

Thanks in advance

ps by the way can you explain me when core$macros.js and constants_table.js come to play during transpiling?

[Mike Fikes]

Hi Andray,

Can you provide an example. FWIW this is working for me:

foo.core=> (cljs/eval-str st "(defn square [x] (* x x))" 'test {:eval cljs/js-eval} cb)

#object[cljs$user$square "function cljs$user$square(x){

return (x * x);

}"]

nil

foo.core=>

Hi, Maria!

I tried to eval clojurescript form in clojurescript via eval-str and it works for code without functions.
If i add 'defn' form then error occurs. I debugged it and first of all following thing is suspicious: during analyzing defn we are dispatched into core$macros.js functions where .core.cst$sym$cljs$core$macros_SLASH_fn is not defined but similar cljs.core.cst$sym$cljs$core_SLASH_fn symbol is defined in constants_table.js
Can you advice me where i can have a look to resolve my problem?

Thanks in advance

ps by the way can you explain me when core$macros.js and constants_table.js come to play during transpiling?

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[Andray Shotkin]

Hi, Mike!
I am doing similar things:

(defn node-eval [{:keys [name source]}]
(js/eval source)
)

(defn add-code [code]
(def st (empty-state))
(eval-str st
; "(ns foo.bar)\n
; (print (rest [1 2 3]))"

; "(ns foo.bar)
; (print (+ 1 2))"

; "(ns foo.bar)
; (def x 1)
; (def y 2)
; (print x)
; (print y)
; (print (+ x y))"

"(defn my-func [x] (print x))"
'foo.bar
{:verbose true
:source-map true
:eval node-eval
;:load node-load
}
(fn [{:keys [error] :as res}]
(print "continuation")
(if error
(do
(println error)
(println (.. error -cause -stack)))
(println res))))

i am using clojurescript 1.7.228
I have following difference: i cant explicitly import cljs.core/js because of its circular dependency on cljs.core->cljs.core if my cljs file contains only require on cljs.core/js, i didnt resolve this compile time error and copy paste cljs.core/js.cljs content into my own executor.cljs.

[Andray Shotkin]

Mike, thanks!
THe issue was with lein with auto mode watching file changes. I restarted lein and cicrular dependency gone. Now all works. Thanks!
Andrew

[Andray Shotkin]

Mike,
any idea how can i pass outer variables bindings into eval-str?
i see :locals field in options but these locals are not forwarded into env which is used during analyzing clojurescript form?

Andray

[Mike Fikes]

Hi Andray,

I don’t know. I’ve always assumed eval-str treated its contents essentially as a top-level form. Having said that, if you have evaluated `def`s in your environment and maintain the analysis cache, then your evaluated string will “see” those `def`s.

- Mike

[Yehonathan Sharvit]

I have an issue when requiring cljs.js and compiling in `:optimizations :whitespace`

I get the following error in the browser: goog.require could not find: cljs.core$macros

Any idea why it happens and how to solve it?

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[Yehonathan Sharvit]

I have opened a jira ticket for this issue: http://dev.clojure.org/jira/browse/CLJS-1565