Start work on loading tree-sitter grammars in GrammarRegistry

spec/fixtures/packages/package-with-tree-sitter-grammar/grammars/fake-parser.js

@@ -0,0 +1 @@
+exports.isFakeTreeSitterParser = true

spec/fixtures/packages/package-with-tree-sitter-grammar/grammars/some-language.cson

@@ -0,0 +1,14 @@
+name: 'Some Language'
+
+id: 'some-language'
+
+type: 'tree-sitter'
+
+parser: './fake-parser'
+
+fileTypes: [
+  'somelang'
+]
+
+scopes:
+  'class > identifier': 'entity.name.type.class'

spec/grammar-registry-spec.js

@@ -13,8 +13,8 @@ describe('GrammarRegistry', () => {
     grammarRegistry = new GrammarRegistry({config: atom.config})
   })
 
-  describe('.assignLanguageMode(buffer, languageName)', () => {
-    it('assigns to the buffer a language mode with the given language name', async () => {
+  describe('.assignLanguageMode(buffer, languageId)', () => {
+    it('assigns to the buffer a language mode with the given language id', async () => {
       grammarRegistry.loadGrammarSync(require.resolve('language-javascript/grammars/javascript.cson'))
       grammarRegistry.loadGrammarSync(require.resolve('language-css/grammars/css.cson'))
 
@@ -34,7 +34,7 @@ describe('GrammarRegistry', () => {
       expect(buffer.getLanguageMode().getLanguageId()).toBe('source.css')
     })
 
-    describe('when no languageName is passed', () => {
+    describe('when no languageId is passed', () => {
       it('makes the buffer use the null grammar', () => {
         grammarRegistry.loadGrammarSync(require.resolve('language-css/grammars/css.cson'))
 

spec/package-manager-spec.js

@@ -1030,6 +1030,13 @@ describe('PackageManager', () => {
         expect(atom.grammars.selectGrammar('a.alot').name).toBe('Alot')
         expect(atom.grammars.selectGrammar('a.alittle').name).toBe('Alittle')
       })
+
+      it('loads any tree-sitter grammars defined in the package', async () => {
+        await atom.packages.activatePackage('package-with-tree-sitter-grammar')
+        const grammar = atom.grammars.selectGrammar('test.somelang')
+        expect(grammar.name).toBe('Some Language')
+        expect(grammar.languageModule.isFakeTreeSitterParser).toBe(true)
+      })
     })
 
     describe('scoped-property loading', () => {

spec/spec-helper.coffee

@@ -111,7 +111,8 @@ beforeEach ->
     new CompositeDisposable(
       @emitter.on("did-tokenize", callback),
       @onDidChangeGrammar =>
-        if @buffer.getLanguageMode().tokenizeInBackground.originalValue
+        languageMode = @buffer.getLanguageMode()
+        if languageMode.tokenizeInBackground?.originalValue
           callback()
     )