first sketch of replacemet

lib/earmark/transform.ex

@@ -483,8 +483,10 @@
     _walk_ast(rest, fun, ignore_strings, [new|result])
   end
   defp _walk_ast([{_, _, content, _}=tuple|rest], fun, ignore_strings, result) do
-    {new_tag, new_atts, _, new_meta} = fun.(tuple)
-    _walk_ast([content|rest], fun, ignore_strings, [@pop, {new_tag, new_atts, [], new_meta}|result])
+    case fun.(tuple) do
+      {new_tag, new_atts, _, new_meta} -> _walk_ast([content|rest], fun, ignore_strings, [@pop, {new_tag, new_atts, [], new_meta}|result])
+      {:replace, content} -> _walk_ast(rest, fun, ignore_strings, [content|result])
+    end
   end
   defp _walk_ast([[h|t]|rest], fun, ignore_strings, result) do
     _walk_ast([h, t|rest], fun, ignore_strings, result)

mix.exs

@@ -1,17 +1,17 @@
     defmodule Earmark.Mixfile do
   use Mix.Project
 
-  @version "1.4.23"
+  @version "1.4.25"
 
   @url "https://github.com/pragdave/earmark"
 
 
   @deps [
-    {:earmark_parser, "~> 1.4.24" },
+    {:earmark_parser, "~> 1.4.25" },
     # {:earmark_parser, path: "../earmark_parser"},
     {:dialyxir, "~> 1.1", only: [:dev, :test], runtime: false},
     {:benchfella, "~> 0.3.0", only: [:dev]},
-    {:earmark_ast_dsl, "~> 0.2.5", only: [:test]},
+    {:earmark_ast_dsl, "~> 0.3.6", only: [:dev, :test]},
     {:excoveralls, "~> 0.14.4", only: [:test]},
     # {:extractly, "~> 0.5.0", git: "https://github.com/RobertDober/extractly.git", tag: "v0.5.0-pre1", only: [:dev]},
     {:extractly, "~> 0.5.3", only: [:dev]},

mix.lock

@@ -2,8 +2,8 @@
   "benchfella": {:hex, :benchfella, "0.3.5", "b2122c234117b3f91ed7b43b6e915e19e1ab216971154acd0a80ce0e9b8c05f5", [:mix], [], "hexpm", "23f27cbc482cbac03fc8926441eb60a5e111759c17642bac005c3225f5eb809d"},
   "certifi": {:hex, :certifi, "2.9.0", "6f2a475689dd47f19fb74334859d460a2dc4e3252a3324bd2111b8f0429e7e21", [:rebar3], [], "hexpm", "266da46bdb06d6c6d35fde799bcb28d36d985d424ad7c08b5bb48f5b5cdd4641"},
   "dialyxir": {:hex, :dialyxir, "1.1.0", "c5aab0d6e71e5522e77beff7ba9e08f8e02bad90dfbeffae60eaf0cb47e29488", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "07ea8e49c45f15264ebe6d5b93799d4dd56a44036cf42d0ad9c960bc266c0b9a"},
-  "earmark_ast_dsl": {:hex, :earmark_ast_dsl, "0.2.5", "e44146944eebe83b33e3597da27fb9b37af7287c55e8cc3bd014cfcd5e57c355", [:mix], [], "hexpm", "da14595fcc283fa8d3ada8adb0b934cab791917b82cc5149cc4c404545cdc2b1"},
-  "earmark_parser": {:hex, :earmark_parser, "1.4.24", "344f8d2a558691d3fcdef3f9400157d7c4b3b8e58ee5063297e9ae593e8326d9", [:mix], [], "hexpm", "1f6451b0116dd270449c8f5b30289940ee9c0a39154c783283a08e55af82ea34"},
+  "earmark_ast_dsl": {:hex, :earmark_ast_dsl, "0.3.6", "bc3b0f06bdf89532cd039ea5b4e0df3839395a8197e46a7d7daa0bbd801202a9", [:mix], [], "hexpm", "47cc790831d41843d793fe0b6462036f2c615bb6a7b3874282431928c3824d07"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.25", "2024618731c55ebfcc5439d756852ec4e85978a39d0d58593763924d9a15916f", [:mix], [], "hexpm", "56749c5e1c59447f7b7a23ddb235e4b3defe276afc220a6227237f3efe83f51e"},
   "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
   "excoveralls": {:hex, :excoveralls, "0.14.4", "295498f1ae47bdc6dce59af9a585c381e1aefc63298d48172efaaa90c3d251db", [:mix], [{:hackney, "~> 1.16", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "e3ab02f2df4c1c7a519728a6f0a747e71d7d6e846020aae338173619217931c1"},
   "extractly": {:hex, :extractly, "0.5.3", "ca6afc3430e63cc9017d50eb03bdf1a3499c7e888037d2279b0ec0ea393af390", [:mix], [], "hexpm", "858f7a285ffb767937e75bb8866f03fecb3b7e5b42728a9677d2ebb6ea885503"},

test/acceptance/earmark/postprocessor_test.exs

@@ -0,0 +1,53 @@
+defmodule Test.Acceptance.Earmark.PostprocessorTest do
+  use ExUnit.Case
+
+  describe "use case from Issue 446" do
+    @no_code """
+    just a line
+    """
+    test "no code" do
+      assert parse(@no_code) == "<p>\njust a line</p>\n"
+    end
+
+    @inline_code """
+    `alpha`
+    ``beta
+    ` ``
+    """
+    test "inline code" do
+      expected = "<p>\n<code class=\"inline\">alpha</code>\n<code class=\"inline\">beta `</code></p>\n"
+      assert parse(@inline_code) == expected
+    end
+
+    @code_to_be_replaced """
+    pre
+    ```
+    immaterial
+    ```
+    post
+    """
+    test "replacing" do
+      expected = "<p>\npre</p>\n<pre><code>xxx</code></pre>\n<p>\npost</p>\n"
+      assert parse(@code_to_be_replaced) == expected
+    end
+  end
+
+  defp parse(markdown) do
+    options = [
+      registered_processors: [
+        {"code", &render_code_node/1}
+      ]
+    ]
+    {:ok, post_html, _} = Earmark.as_html(markdown, options)
+    post_html
+  end
+
+  defp render_code_node({"code", attrs, _content, meta} = node) do
+    classes = Earmark.AstTools.find_att_in_node(node, "class") || ""
+    cond do
+      classes =~ "inline" -> node
+      true -> {:replace, {"code", attrs, "xxx", meta}}
+    end
+  end
+end
+# SPDX-License-Identifier: Apache-2.0

test/acceptance/transform/map_ast_test.exs

@@ -2,6 +2,7 @@ defmodule Test.Acceptance.Transform.MapAstTest do
   use ExUnit.Case
 
   import Earmark.Transform
+  import EarmarkAstDsl
 
   describe "adding a count" do
     @ast [
@@ -104,5 +105,15 @@ defmodule Test.Acceptance.Transform.MapAstTest do
     defp push_annotation(text, anno), do: {text <> anno, nil}
 
   end
+
+  describe "change content" do
+    test "replace content of a node" do
+      original = [div([p("x"), p("y")])]
+      new = [div([div(p("x")), p("y")])]
+      transformer = fn {"p", _, ["x"], _} = node -> {:replace, {"div", [], [node], %{}}}
+                        other -> other end
+      assert map_ast(original, transformer) == new
+    end
+  end
 end
 #  SPDX-License-Identifier: Apache-2.0