fix: Earmark crashes (like EarmarkParser) on "\\[{:}" #501

* Fixes #501

lib/earmark_parser/ast/inline.ex

@@ -255,7 +255,7 @@ defmodule Earmark.Parser.Ast.Inline do
     if match = Regex.run(@inline_ial, src) do
       [match, ial] = match
       {context1, ial_attrs} = parse_attrs(context, ial, lnb)
-      new_tags = augment_tag_with_ial(context.value, ial_attrs)
+      new_tags = augment_tag_with_ial(context.value, ial_attrs, match)
       {behead(src, match), lnb, set_value(context1, new_tags), use_linky?}
     end
   end

lib/earmark_parser/helpers/ast_helpers.ex

@@ -28,15 +28,16 @@ defmodule Earmark.Parser.Helpers.AstHelpers do
   end
 
   @doc false
-  def augment_tag_with_ial(tags, ial)
-
-  def augment_tag_with_ial([{t, a, c, m} | tags], atts) do
-    [{t, merge_attrs(a, atts), c, m} | tags]
+  def augment_tag_with_ial(tags, ial, src)
+  def augment_tag_with_ial([{t, a, c, m}|tags], atts, _src) do
+    [{t, merge_attrs(a, atts), c, m}|tags]
   end
-
-  def augment_tag_with_ial([], _atts) do
+  def augment_tag_with_ial([], _atts, _src) do
     []
   end
+  def augment_tag_with_ial([any], _atts, src) do
+    [any <> src]
+  end
 
   @doc false
   def code_classes(language, prefix) do

test/regressions/i154_crash_on_symbolic_input_test.exs

@@ -0,0 +1,11 @@
+defmodule Test.Regressions.I154CrashOnSymbolicInputTest do
+  use ExUnit.Case
+
+  test "do not crash here" do
+    md = "\\[{:}"
+    html = "<p>\n[{:}</p>\n"
+    assert Earmark.as_html(md) == {:ok, html, []}
+  end
+
+end
+# SPDX-License-Identifier: Apache-2.0