Make any ASCII character escapable

.github/workflows/main.yml

@@ -130,3 +130,18 @@ jobs:
       - name: Publish Docker image
         if: github.ref == 'refs/heads/main'
         run: docker push witiko/markdown --all-tags
+  automerge:
+    name: Automatically merge pull request
+    needs:
+      - test-and-publish
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - name: Automatically merge pull request
+        uses: plm9606/automerge_actions@1.2.3
+        with:
+          label-name: automerge
+          reviewers-number: 0
+          merge-method: merge
+          auto-delete: true
+          github-token: ${{ secrets.GITHUB_TOKEN }}

markdown.dtx

@@ -6456,7 +6456,7 @@ defaultOptions.shiftHeadings = 0
 % \fi
 % \begin{markdown}
 %
-% \Valitem[\textasciicircum{} \$]{slice}{the beginning and the end of a slice}
+% \Valitem[\textasciicircum{} \\$]{slice}{the beginning and the end of a slice}
 %
 :    Two space-separated selectors that specify the slice of a document that
      will be processed, whereas the remainder of the document will be ignored.
@@ -19482,7 +19482,7 @@ parsers.fourspaces             = P("    ")
 parsers.any                    = P(1)
 parsers.fail                   = parsers.any - 1
 
-parsers.escapable              = S("\\`*_{}[]()+_.!<>#-~:^@;")
+parsers.escapable              = S("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~")
 parsers.anyescaped             = parsers.backslash / "" * parsers.escapable
                                + parsers.any
 
@@ -19739,9 +19739,10 @@ parsers.leader      = parsers.space^-3
 
 -- content in balanced brackets, parentheses, or quotes:
 parsers.bracketed   = P{ parsers.lbracket
-                       * ((parsers.anyescaped - (parsers.lbracket
-                                                + parsers.rbracket
-                                                + parsers.blankline^2)
+                       * (( parsers.backslash / "" * parsers.rbracket
+                          + parsers.any - (parsers.lbracket
+                                          + parsers.rbracket
+                                          + parsers.blankline^2)
                           ) + V(1))^0
                        * parsers.rbracket }
 
@@ -19769,7 +19770,8 @@ parsers.tag         = parsers.lbracket
                     * Cs((parsers.alphanumeric^1
                          + parsers.bracketed
                          + parsers.inticks
-                         + (parsers.anyescaped
+                         + ( parsers.backslash / "" * parsers.rbracket
+                           + parsers.any
                            - (parsers.rbracket + parsers.blankline^2)))^0)
                     * parsers.rbracket
 

tests/testfiles/CommonMark_0.30/backslash-escapes.test

@@ -0,0 +1,25 @@
+<<<
+\!\"\#\$\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\@\[\\\]\^\_\`\{\|\}\~
+
+\→\a\ \3\φ\«
+>>>
+documentBegin
+hash
+dollarSign
+percentSign
+ampersand
+backslash
+circumflex
+underscore
+leftBrace
+pipe
+rightBrace
+tilde
+interblockSeparator
+backslash
+backslash
+backslash
+backslash
+backslash
+backslash
+documentEnd

tests/testfiles/PHP_Markdown/php-specific-bugs.test

@@ -29,11 +29,11 @@ codeSpan: /e
 codeSpan: (underscore)UnslashQuotes
 interblockSeparator
 interblockSeparator
-headingOne: Header "quoted(backslash)" again (backslash)""
+headingOne: Header "quoted" again (backslash)""
 interblockSeparator
-headingTwo: Header "quoted(backslash)" again (backslash)""
+headingTwo: Header "quoted" again (backslash)""
 interblockSeparator
-headingThree: Header "quoted(backslash)" again (backslash)""
+headingThree: Header "quoted" again (backslash)""
 interblockSeparator
 codeSpan: (underscore)Detab
 interblockSeparator

tests/testfiles/lunamark-markdown/no-hybrid.test

@@ -32,7 +32,6 @@ dollarSign
 ulItemEnd
 ulItem
 backslash
-backslash
 percentSign
 ulItemEnd
 ulItem

tests/testfiles/lunamark-markdown/no-tex-comments.test

@@ -12,7 +12,7 @@ documentBegin
 codeSpan: texComments
 interblockSeparator
 emphasis: emphasi(percentSign) this is a comment zed text
-emphasis: emphasi(backslash)(percentSign) another one zed text
+emphasis: emphasi(percentSign) another one zed text
 interblockSeparator
 emphasis: end of (backslash) a line
 documentEnd