feat: Langium grammar (#470)

Closes partially #433.

### Summary of Changes

* Recreate grammar in [Langium](https://github.com/langium/langium)

### TODOs

- [x] More grammar tests
  - [x] declarations
  - [x] expressions
  - [x] keywords as names
  - [x] modules
  - [x] schema
  - [x] statements
  - [x] trailing commas
  - [x] types
- [x] Document how to write grammar tests
- [X] Resolve the grammar ambiguity warning
- [X] Fix error when hovering over modules members or class members

---------

Co-authored-by: megalinter-bot <129584137+megalinter-bot@users.noreply.github.com>

.eslintignore

@@ -2,3 +2,6 @@
 build/
 dist/
 out/
+
+# DSL-langium
+/DSL-langium/vitest.config.ts

.github/workflows/main.yml

@@ -80,6 +80,12 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Generate Langium files
+        run: npm run langium:generate
+
+      - name: Compile TypeScript
+        run: npm run build
+
       - name: Test with Vitest
         run: npm run test-with-coverage
 

.github/workflows/pr.yml

@@ -96,6 +96,12 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Generate Langium files
+        run: npm run langium:generate
+
+      - name: Compile TypeScript
+        run: npm run build
+
       - name: Test with Vitest
         run: npm run test-with-coverage
 

.gitignore

@@ -18,6 +18,7 @@ coverage/
 dist/
 dist-ssr/
 out/
+/DSL-langium/syntaxes/safe-ds.tmLanguage.json
 
 # Gradle
 .gradle/

DSL-langium/bin/cli

@@ -1,3 +1,3 @@
 #!/usr/bin/env node
 
-require("../out/cli").default();
+require("../out/src/cli").default();

DSL-langium/langium-config.json

@@ -4,7 +4,7 @@
         {
             "id": "safe-ds",
             "grammar": "src/language-server/grammar/safe-ds.langium",
-            "fileExtensions": [".sdspipe", ".sdsschema", ".sdsstub", ".sdstest"],
+            "fileExtensions": [".sdspipe", ".sdsstub", ".sdstest"],
             "textMate": {
                 "out": "syntaxes/safe-ds.tmLanguage.json"
             }

DSL-langium/language-configuration.json

@@ -6,20 +6,24 @@
     "brackets": [
         ["{", "}"],
         ["[", "]"],
-        ["(", ")"]
+        ["(", ")"],
+        ["»", "«"]
     ],
     "autoClosingPairs": [
         ["{", "}"],
         ["[", "]"],
         ["(", ")"],
+        ["»", "«"],
         ["\"", "\""],
-        ["'", "'"]
+        ["`", "`"]
     ],
     "surroundingPairs": [
         ["{", "}"],
         ["[", "]"],
         ["(", ")"],
+        ["<", ">"],
+        ["»", "«"],
         ["\"", "\""],
-        ["'", "'"]
+        ["`", "`"]
     ]
 }