Liking cljdoc? Tell your friends :D

Edamame

Configurable EDN/Clojure parser with location metadata.

CircleCI Clojars Project cljdoc badge

Rationale

This library can be useful when:

  • You want to include locations in feedback about EDN files.
  • You want to parse Clojure-like expressions without any evalution.

This library came out of sci, a small Clojure interpreter.

Features

  • Parse EDN values with location as metadata.
  • Is able to parse Clojure code without evaluation
  • Configurable

This library works with:

  • Clojure on the JVM
  • ClojureScript

Usage

(require '[edamame.core :refer [parse-string]])

Location metadata

Locations are attached as metadata:

(def s "
[{:a 1}
 {:b 2}]")
(map meta (parse-string s))
;;=>
({:row 2, :col 2}
 {:row 3, :col 2})

(->> "{:a {:b {:c [a b c]}}}"
     parse-string
     (tree-seq coll? #(if (map? %) (vals %) %))
     (map meta))
;;=>
({:row 1, :col 1}
 {:row 1, :col 5}
 {:row 1, :col 9}
 {:row 1, :col 13}
 {:row 1, :col 14}
 {:row 1, :col 16}
 {:row 1, :col 18})

Parser options

Edamame's API consists of two functions: parse-string which parses a the first form from a string and parse-string-all which parses all forms from a string. Both functions take the same options. See the docstring of parse-string for all the options.

Examples:

(parse-string "@foo" {:deref true})
;;=> (deref foo)

(parse-string "'bar" {:quote true})
;;=> (quote bar)

(parse-string "#(* % %1 %2)" {:fn true})
;;=> (fn [%1 %2] (* %1 %1 %2))

(parse-string "#=(+ 1 2 3)" {:read-eval true})
;;=> (read-eval (+ 1 2 3))

(parse-string "#\"foo\"" {:regex true})
;;=> #"foo"

(parse-string "`(+ 1 2 3 ~x ~@y)" {:syntax-quote true :unquote true :unquote-splicing true})
;;=> (syntax-quote (+ 1 2 3 (unquote x) (unquote-splicing y)))

(parse-string "#'foo" {:var true})
;;=> (var foo)

(parse-string "#(alter-var-root #'foo %)" {:all true})
;;=> (fn [%1] (alter-var-root (var foo) %1))

Note that standard behavior is overridable with functions:

(parse-string "#\"foo\"" {:regex #(list 're-pattern %)})
(re-pattern "foo")

Process reader conditionals:

(parse-string "[1 2 #?@(:cljs [3 4])]" {:features #{:cljs} :read-cond :allow})
;;=> [1 2 3 4]

(parse-string "[1 2 #?@(:cljs [3 4])]" {:features #{:cljs} :read-cond :preserve})
;;=> [1 2 #?@(:cljs [3 4])]

Test

script/test/jvm
script/test/node
script/test/all

Status

Experimental. Breaking changes are expected to happen at this phase.

Installation

Use as a dependency:

Clojars Project

Credits

The code is largely inspired by rewrite-clj and derived projects.

License

Copyright © 2019 Michiel Borkent

Distributed under the Eclipse Public License 1.0. This project contains code from Clojure and ClojureScript which are also licensed under the EPL 1.0. See LICENSE.

Can you improve this documentation? These fine people already did:
Michiel Borkent, sogaiu & Tommi Reiman
Edit on GitHub

cljdoc is a website building & hosting documentation for Clojure/Script libraries

× close