Use commonmark-java instead of markdown-it via GraalJS

.dir-locals.el

@@ -0,0 +1,2 @@
+((clojure-mode
+  (cider-clojure-cli-aliases . ":test:repl")))

CHANGELOG.md

@@ -1,7 +1,8 @@
 # Changelog
 
-## Unreleased
+## 0.6 Unreleased
 
+* We're swapping out GraalJS in favour of [commonmark-java](https://github.com/markdown-it/markdown-it) on the JVM side. The cljs implementation stays the same.
 * Comply with commonmark's suggested rendering of images by default ([#18](https://github.com/nextjournal/markdown/issues/18)). This is a breaking change.
 
 ## 0.5.148

README.md

@@ -4,13 +4,12 @@
 
 A cross-platform clojure library for [Markdown](https://en.wikipedia.org/wiki/Markdown) parsing and transformation.
 
-
 🚧 _ALPHA_ status, subject to frequent change. For a richer reading experience [read this readme as a clerk notebook](https://nextjournal.github.io/markdown/README).
 
 ## Features
 
 * _Focus on data_: parsing yields an AST ([à la Pandoc](https://nextjournal.github.io/markdown/notebooks/pandoc)) of nested data representing a structured document.
-* _Cross Platform_: clojurescript native, we target the JVM using [Graal's Polyglot Library](https://www.graalvm.org/22.1/reference-manual/js/JavaInteroperability/#polyglot-context).
+* _Cross Platform_: using [commonmark-java](https://github.com/commonmark/commonmark-java) on the JVM and [markdown-it](https://github.com/markdown-it/markdown-it) for clojurescript
 * _Configurable [Hiccup](https://github.com/weavejester/hiccup) conversion_.
 
 ## Try

bb.edn

@@ -36,12 +36,12 @@
   build:notebooks
   {:doc "builds a Clerk static with notebooks specified in deps.edn given a specified git SHA"
    :depends [cljs:sci:release]
-   :task (clojure (str "-X:nextjournal/clerk :git/sha '\"" (first *command-line-args*) "\"' :browse? false"))}
+   :task (clojure (str "-X:dev:nextjournal/clerk :git/sha '\"" (or (first *command-line-args*) "SHASHASHA") "\"' :browse? false"))}
 
   dev
   {:doc "Boots and watches both shadow browser test and sci builds"
    :depends [yarn-install]
-   :task (clojure "-M:test:nextjournal/clerk:sci watch sci browser-test")}
+   :task (clojure "-M:dev:test:nextjournal/clerk:sci watch sci browser-test")}
 
   cljs:sci
   {:doc "watches cljs build"

deps.edn

@@ -1,12 +1,18 @@
-{:paths ["src" "resources"]
+{:paths ["src" "resources" "classes"]
+ :mvn/repos {"jitpack.io" {:url "https://jitpack.io"}}
  :deps {applied-science/js-interop {:mvn/version "0.3.3"}
         org.clojure/data.json {:mvn/version "2.4.0"}
-        org.graalvm.js/js {:mvn/version "21.3.2.1"}}
+        org.commonmark/commonmark {:mvn/version "0.23.0"}
+        org.commonmark/commonmark-ext-autolink {:mvn/version "0.23.0"}
+        org.commonmark/commonmark-ext-footnotes {:mvn/version "0.23.0"}
+        org.commonmark/commonmark-ext-task-list-items {:mvn/version "0.23.0"}
+        org.commonmark/commonmark-ext-gfm-tables {:mvn/version "0.23.0"}
+        org.commonmark/commonmark-ext-gfm-strikethrough {:mvn/version "0.23.0"}}
 
  :aliases
  {:nextjournal/clerk
-  {:extra-paths ["notebooks"]
-   :extra-deps {io.github.nextjournal/clerk {:git/sha "e8f275b5cf077ec9441e404c1885ff0b6ee0aef9"
+  {:extra-paths ["notebooks" "dev"]
+   :extra-deps {io.github.nextjournal/clerk {:git/sha "f7b47ebb639ea157a0f72d6a63e7f263179c72a9"
                                              :exclusions [io.github.nextjournal/markdown]}}
    :jvm-opts ["-Dclojure.main.report=stderr"
               "-Dclerk.resource_manifest={\"/js/viewer.js\" \"js/viewer.js\"}"] ;;
@@ -24,8 +30,15 @@
   :quiet
   {:jvm-opts ["-Dpolyglot.engine.WarnInterpreterOnly=false"]}
 
+  :dev
+  {:extra-paths ["dev"]
+   :extra-deps {org.babashka/http-client {:mvn/version "0.3.11"}
+                org.clojure/test.check {:mvn/version "1.1.1"}
+                org.graalvm.js/js {:mvn/version "21.3.2.1"}}}
+
   :test
   {:extra-paths ["test"]
+   :jvm-opts ["-Dclojure.main.report=stderr"]
    :extra-deps {nubank/matcher-combinators {:mvn/version "3.8.3"}}
    :exec-fn test-runner/run}
 
@@ -40,7 +53,7 @@
    :main-opts ["-m" "shadow.cljs.devtools.cli"]
    :jvm-opts ["-Dclerk.resource_manifest={\"/js/viewer.js\" \"http://localhost:8021/viewer.js\"}"]
    :extra-deps {io.github.nextjournal/clerk.render {:git/url "https://github.com/nextjournal/clerk"
-                                                    :git/sha "e8f275b5cf077ec9441e404c1885ff0b6ee0aef9"
+                                                    :git/sha "f7b47ebb639ea157a0f72d6a63e7f263179c72a9"
                                                     :deps/root "render"}}}
 
   :build

src/nextjournal/markdown.clj → dev/nextjournal/markdown/graaljs.clj

@@ -1,4 +1,4 @@
-(ns nextjournal.markdown
+(ns nextjournal.markdown.graaljs
   "Facility functions for handling markdown conversions"
   (:require [clojure.java.io :as io]
             [clojure.data.json :as json]
@@ -67,6 +67,13 @@
 - [x] ~~thing~~
 ")
 
+  (parse "some text[^note] and some other[^other] but again[^note]
+
+[^other]: some other
+[^note]: some story
+")
+
+
   (->hiccup "# Hello Markdown
 
 * What's _going_ on?

src/nextjournal/markdown/parser.cljc → dev/nextjournal/markdown/parser.cljc

@@ -22,7 +22,7 @@
   (:require [clojure.string :as str]
             [clojure.zip :as z]
             [nextjournal.markdown.transform :as md.transform]
-            [nextjournal.markdown.parser.emoji :as emoji]
+            [nextjournal.markdown.utils.emoji :as emoji]
             #?@(:cljs [[applied-science.js-interop :as j]
                        [cljs.reader :as reader]])))
 
@@ -101,7 +101,9 @@
 
 (defn parse-fence-info [info-str]
   (try
-    (when (string? info-str)
+    ;; NOTE: this fix is backported
+    ;; from the new implementation 👇
+    (when (and (string? info-str) (seq info-str))
       (let [tokens (-> info-str
                        str/trim
                        (str/replace #"[\{\}\,]" "")         ;; remove Pandoc/Rmarkdown brackets and commas
@@ -417,6 +419,8 @@ end"
             (let [new-loc (-> loc (z/replace {:type :sidenote-container :content []})
                               (z/append-child node)
                               (z/append-child {:type :sidenote-column
+                                               ;; TODO: broken in the old implementation
+                                               ;; should be :content (mapv #(footnote->sidenote (get footnotes %)) (distinct refs))}))]
                                                :content (mapv #(footnote->sidenote (get footnotes %)) refs)}))]
               (recur (z/right new-loc) (z/up new-loc)))
             (recur (z/right loc) parent))

dev/old_vs_new.clj

@@ -0,0 +1,59 @@
+(ns old-vs-new
+  (:require [clojure.string :as str]
+            [nextjournal.markdown.graaljs :as md-old]
+            [nextjournal.markdown :as md]
+            [babashka.http-client :as http]
+            [clojure.test.check :as tc]
+            [clojure.test.check.generators :as gen]
+            [clojure.test.check.properties :as prop]
+            [clojure.test.check.clojure-test :refer [defspec]]))
+
+(comment
+  (= (md/parse "https://github.com")
+     (md-old/parse "https://github.com"))
+
+  (:body (http/get "https://jaspervdj.be/lorem-markdownum/markdown.txt?fenced-code-blocks=on"))
+
+  (let [sample (:body (http/get "https://jaspervdj.be/lorem-markdownum/markdown.txt?num-blocks=1000&fenced-code-blocks=on"))]
+    [(with-out-str (time (md-old/parse sample)))
+     (with-out-str (time (md/parse sample)))]))
+
+(def feature-keys
+  (list "no-headers"
+        "no-code"
+        "no-quotes"
+        "no-lists"
+        "no-inline-markup"
+        "no-external-links"
+        "underline-headers"
+        "underscore-em"
+        "underscore-strong"
+        "no-wrapping"
+        "fenced-code-blocks"
+        "reference-links"))
+
+(defn opts->query [opts]
+  (str/join "&" (keep (fn [[k v]] (when v (str k "=on"))) opts)))
+
+(defn size+opts->random-md-str [size opts]
+  (:body (http/get (format "https://jaspervdj.be/lorem-markdownum/markdown.txt?%s&num-blocks=%s" (opts->query opts) size))))
+
+(def md-generator
+  (gen/sized (fn [size]
+               #_(prn :size size)
+               (gen/fmap #(size+opts->random-md-str size %)
+                         (gen/fmap (partial zipmap feature-keys) (gen/vector gen/boolean 12))))))
+
+#_(gen/sample md-generator)
+
+(def compare-old-vs-new-parse-implementations
+  (prop/for-all [s md-generator]
+    (= (md/parse s)
+       (md-old/parse s))))
+
+#_(tc/quick-check 100 compare-old-vs-new-parse-implementations)
+
+(defspec test-old-vs-new-implem 100
+  compare-old-vs-new-parse-implementations)
+
+#_(test-old-vs-new-implem)

notebooks/benchmarks.clj

@@ -1,29 +1,37 @@
 ;; # ⏱ Some Naïve Benchmarks
-(ns ^:nextjournal.clerk/no-cache benchmarks
+(ns benchmarks
+  {:nextjournal.clerk/no-cache true}
   (:require [clojure.test :refer :all]
-            [nextjournal.clerk :as clerk]
             [nextjournal.clerk.eval :as clerk.eval]
             [nextjournal.markdown :as md]
-            parsing-extensibility
-            [nextjournal.markdown.parser :as md.parser]))
+            [nextjournal.markdown.graaljs :as old-md]
+            [nextjournal.markdown.utils :as u]
+            [parsing-extensibility]))
 
 (def reference-text (slurp "notebooks/reference.md"))
 
 (defmacro time-ms [& expr]
   `(-> (clerk.eval/time-ms (dotimes [_# 100] ~@expr)) :time-ms (/ 100)))
 
-(comment
-  (macroexpand '(time-ms do-this)))
 
 ;; Compare with different set of tokenizers
 (defn parse
   ([text] (parse [] text))
   ([extra-tokenizers text]
-   (md.parser/parse (update md.parser/empty-doc :text-tokenizers concat extra-tokenizers)
-                    (md/tokenize text))))
+   (md/parse* (assoc u/empty-doc :text-tokenizers extra-tokenizers)
+              text)))
 
-;; Default set of tokenizers
-(time-ms (parse reference-text))
+(-> (parse reference-text) :content count)
+
+;; Default set of tokenizers, warmup
+[(time-ms (parse reference-text))
+ (time-ms (parse reference-text))
+ (time-ms (parse reference-text))]
+
+;; GraalJS based implementation
+[(time-ms (old-md/parse reference-text))
+ (time-ms (old-md/parse reference-text))
+ (time-ms (old-md/parse reference-text))]
 
 ;; With an extra brace-brace parser
 (time-ms (parse [{:regex #"\{\{([^\{]+)\}\}"
@@ -39,14 +47,10 @@
 
 ;; With hashtags and internal links
 (time-ms
- (parse [md.parser/hashtag-tokenizer
-         md.parser/internal-link-tokenizer
+ (parse [u/hashtag-tokenizer
+         u/internal-link-tokenizer
          {:regex #"\{\{([^\{]+)\}\}"
           :handler (fn [m] {:type :var :text (m 1)})}
          {:tokenizer-fn parsing-extensibility/losange-tokenizer-fn
           :handler (fn [data] {:type :losange :data data})}]
         reference-text))
-
-^{::clerk/visibility {:code :hide :result :hide}}
-(comment
-  (clerk/serve! {:port 8888}))

notebooks/pandoc.clj

@@ -9,7 +9,7 @@
             [nextjournal.clerk :as clerk]
             [nextjournal.clerk.viewer :as v]
             [nextjournal.markdown :as md]
-            [nextjournal.markdown.parser :as md.parser]
+            [nextjournal.markdown.utils :as u]
             [nextjournal.markdown.transform :as md.transform]))
 
 ;; From the [docs](https://pandoc.org/MANUAL.html#description):
@@ -161,20 +161,20 @@ this _is_ a
                                    {:type :list-item
                                     :content (keep pandoc->md li)}) (second (:c node)))})
 
-   :Math (fn [node] (let [[_meta latex] (:c node)] (md.parser/block-formula latex)))
+   :Math (fn [node] (let [[_meta latex] (:c node)] (u/block-formula latex)))
    :Code (fn [node]
            (let [[_meta code] (:c node)]
-             {:type :monospace :content [(md.parser/text-node code)]}))
+             {:type :monospace :content [(u/text-node code)]}))
    :CodeBlock (fn [node]
                 (let [[[_id classes _meta] code] (:c node)]
                   {:type :code
-                   :content [(md.parser/text-node code)]}))
+                   :content [(u/text-node code)]}))
    :SoftBreak (constantly {:type :softbreak})
    :RawBlock (constantly nil)
    :RawInline (fn [{:keys [c]}]
                 (cond
                   (and (vector? c) (= "latex" (first c)))
-                  (md.parser/formula (second c))))})
+                  (u/formula (second c))))})
 
 ^{::clerk/visibility {:result :hide}}
 (defn pandoc->md [{:as node :keys [t pandoc-api-version blocks]}]
@@ -226,9 +226,6 @@ this _is_ a
 
 ^{::clerk/visibility {:result :hide :code :hide}}
 (comment
-  (clerk/serve! {:port 9999})
-  (clerk/clear-cache!)
-  (-> *e ex-cause ex-data)
   (json/read-str
    (:out
     (shell/sh "pandoc" "-f" "markdown" "-t" "json" :in markdown-text))