Add support for GitLab Flavored Markdown

See valentjn/vscode-ltex#210.

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ## 9.1.0 (upcoming)
 
+- Add support for [GitLab Flavored Markdown](https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/markdown.md), especially inline math (e.g., ``$`E = mc^2`$``)
 - Use Flexmark's YAML Front Matter extension to ignore YAML front matter in Markdown instead of own handling
 - Print Flexmark AST of Markdown documents to log when [`ltex.ltex-ls.logLevel`](https://valentjn.github.io/vscode-ltex/docs/settings.html#ltexltex-lsloglevel) is `"finest"`
 

ltexls-core/pom.xml

@@ -57,6 +57,11 @@
       <artifactId>flexmark-ext-yaml-front-matter</artifactId>
       <version>0.62.2</version>
     </dependency>
+    <dependency>
+      <groupId>com.vladsch.flexmark</groupId>
+      <artifactId>flexmark-ext-gitlab</artifactId>
+      <version>0.62.2</version>
+    </dependency>
     <dependency>
       <groupId>com.vladsch.flexmark</groupId>
       <artifactId>flexmark-test-util</artifactId>

ltexls-core/src/main/java/org/bsplines/ltexls/parsing/markdown/MarkdownAnnotatedTextBuilder.java

@@ -7,6 +7,7 @@
 
 package org.bsplines.ltexls.parsing.markdown;
 
+import com.vladsch.flexmark.ext.gitlab.GitLabExtension;
 import com.vladsch.flexmark.ext.yaml.front.matter.YamlFrontMatterExtension;
 import com.vladsch.flexmark.parser.Parser;
 import com.vladsch.flexmark.test.util.AstCollectingVisitor;
@@ -29,7 +30,10 @@
 
 public class MarkdownAnnotatedTextBuilder extends CodeAnnotatedTextBuilder {
   private static final DataHolder parserOptions = new MutableDataSet().set(Parser.EXTENSIONS,
-      Arrays.asList(YamlFrontMatterExtension.create()));
+      Arrays.asList(
+        GitLabExtension.create(),
+        YamlFrontMatterExtension.create()
+      ));
 
   private Parser parser = Parser.builder(parserOptions).build();
 

ltexls-core/src/main/java/org/bsplines/ltexls/parsing/markdown/MarkdownAnnotatedTextBuilderDefaults.java

@@ -22,6 +22,7 @@ private static List<MarkdownNodeSignature> createDefaultMarkdownNodeSignatures()
     list.add(new MarkdownNodeSignature("Code", MarkdownNodeSignature.Action.DUMMY));
     list.add(new MarkdownNodeSignature("CodeBlock"));
     list.add(new MarkdownNodeSignature("FencedCodeBlock"));
+    list.add(new MarkdownNodeSignature("GitLabInlineMath", MarkdownNodeSignature.Action.DUMMY));
     list.add(new MarkdownNodeSignature("IndentedCodeBlock"));
 
     return list;

ltexls-core/src/test/java/org/bsplines/ltexls/parsing/markdown/MarkdownAnnotatedTextBuilderTest.java

@@ -49,6 +49,9 @@ public void test() throws IOException {
     assertPlainText(
         "This is a test: `inline code`.\n\n```\ncode block\n```\n\nThis is another sentence.\n",
         "This is a test: Dummy0.\n\n\n\n\n\nThis is another sentence.\n");
+    assertPlainText(
+        "This is a test: $`E = mc^2`$.\n\n```math\na^2 + b^2 = c^2\n```\n\nThis is another test.\n",
+        "This is a test: Dummy0.\n\n\n\n\n\nThis is another test.\n");
 
     Map<String, String> markdownNodes = new HashMap<>();
     markdownNodes.put("Code", "default");