Extensible Data Notation, edn, is a subset of Clojure's data notation intended to be used as a data exchange format.
Rationale and initial spec are located at https://github.com/edn-format/edn.
Questions tagged [edn]
57 questions
27
votes
3 answers
Clojure & ClojureScript: clojure.core/read-string, clojure.edn/read-string and cljs.reader/read-string
I am not clear about the relationship between all these read-string functions. Well, it is clear that clojure.core/read-string can read any serialized string that is output by pr[n] or even print-dup. It is also clear that clojure.edn/read-string…
Neoasimov
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20
votes
1 answer
What is the "Correct" way to write an EDN file in Clojure as of August 2013?
I would like to write out an EDN data file from Clojure as tagged literals. Although the clojure.edn API contains read and read-string, there are no writers. I'm familiar with the issue reported here. Based on that, it's my understanding that the pr…
mokeefe
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13
votes
2 answers
How to use clojure.edn/read to get a sequence of objects in a file?
Clojure 1.5 introduced clojure.edn, which includes a read function that requires a PushbackReader.
If I want to read the first five objects, I can do:
(with-open [infile (java.io.PushbackReader. (clojure.java.io/reader "foo.txt"))]
(binding [*in*…
ToBeReplaced
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9
votes
1 answer
Is there some sort of canonical edn response we can use for ring?
I've been reading the edn spec and want to integrate it into my application. However, I don't know how to transfer edn requests between clojure and client. Do we put a content-type application/edn in the response header and just send the prn output…
zcaudate
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7
votes
1 answer
Clojure RuntimeException - No reader function for tag db/id
What is happening when I get this error in Clojure?
java.lang.RuntimeException: No reader function for tag db/id
Zefira
- 4,329
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6
votes
2 answers
How can I use *data-readers* with edn?
I tried to follow the documentation for clojure.instant/read-instant-timestamp, which reads:
clojure.instant/read-instant-timestamp
To read an instant as a java.sql.Timestamp, bind *data-readers* to a
map with this var as the value for the 'inst…
ToBeReplaced
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5
votes
1 answer
Serializing and de-serializing Clojure code as EDN
I'm trying to use a standard serialization for Clojure code, one that will ignore white spaces, comments etc. I was thinking of using EDN for that.
According to the what I read, the standard way to serialize s-expressions to EDN is through pr-str,…
Boaz Rosenan
- 73
- 6
5
votes
2 answers
How do you use maps created by the edn reader in clojurescript?
This prints :bar in Clojure as I would expect:
(println (:foo (clojure.tools.reader.edn/read-string "{:foo :bar}")))
;=> :bar
But this prints nil in ClojureScript:
(println (:foo (cljs.reader/read-string "{:foo :bar}")))
;=> nil
To make things…
bmaddy
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5
votes
3 answers
How can I pass edn to clojurescript from clojure without making ajax request (i.e. via hiccup-generated page)
I'm developing RIA with clojure and clojurescript. Backend uses hiccup to generate a resulting html, like
(html5
[:head
(include-js "/js/my-cljs-generated.js")]
[:body ... ])
How can I pass edn(hashmap, vector, etc.) to clojurescript within the…
ndrw
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4
votes
1 answer
How to Convert Edn string to Json
I have to retrieve data from some site that sends back responses with edn bodies. I am trying to convert the sent back Edn to Json so I can parse it with Jsoup.
I found a website that was able to do the conversion, but how do I implement something…
Rafat Mahmoud
- 130
- 3
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4
votes
1 answer
Generating Clojure EDN from Python with :symbols
I'm trying to use EDN to communicate between a simple Python server and an in browser app written using ClojureScript.
So the server needs to generate and return chunks of EDN format for the browser.
I've installed…
interstar
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4
votes
2 answers
Client-side transform EDN to JSON (Datomic data consumed by HTML5 app)
I'm implementing basic end-to-end functionality from an HTML5 app to a Datomic database. The first port-of-call is to have the client make an AJAX call directly to the Datomic REST API (http://docs.datomic.com/rest.html).
The problem that needs to…
westwell
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4
votes
1 answer
write large data structures as EDN to disk in clojure
What is the most idiomatic way to write a data structure to disk in Clojure, so I can read it back with edn/read? I tried the following, as recommended in the Clojure cookbook:
(with-open [w (clojure.java.io/writer "data.clj")]
(binding [*out* w]
…
pholz
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3
votes
2 answers
convert Java objects to Clojure types
Hi Currently I am using java.data (https://github.com/clojure/java.data) to convert java pojos to clojure compatible types.
It does not work for nested objects.
For ex:
class Abc {
Map someMap;
}
Class Def {
String b;
}
If I…
ppp456878
- 155
- 8
3
votes
1 answer
Clojure EDN as a Code Generation Metadata source
New to Clojure and wondering how to use it to make other languages I program in easier.
One thing I would like to be able to do is use Clojure for code generation.
For example, given the input from a data file (EDN format) how should I (1) walk this…
BuddyJoe
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