Adding a WASMTreeSitterGrammar

src/wasm-tree-sitter-grammar.js

@@ -0,0 +1,43 @@
+const fs = require('fs');
+const path = require('path');
+const Parser = require('web-tree-sitter');
+
+module.exports = class WASMTreeSitterGrammar {
+  constructor(registry, grammarPath, params) {
+    this.scopeName = params.scopeName
+    const dirName = path.dirname(grammarPath)
+    const qPath = path.join(dirName, params.treeSitter.syntaxQuery)
+    this.syntaxQuery = fs.readFileSync(qPath, 'utf-8')
+    if(params.treeSitter.localsQuery) {
+      const lPath = path.join(dirName, params.treeSitter.localsQuery)
+      this.localsQuery = fs.readFileSync(lPath, 'utf-8')
+    }
+    this.grammarPath = path.join(dirName, params.treeSitter.grammar)
+    this.contentRegex = buildRegex(params.contentRegex);
+    this.firstLineRegex = buildRegex(params.firstLineRegex);
+    this.fileTypes = params.fileTypes || [];
+    this.registry = registry
+  }
+
+  // TODO: Why is this here?
+  activate() {
+    this.registration = this.registry.addGrammar(this);
+  }
+
+  // TODO: Why is this here?
+  deactivate() {
+    this.registration?.dispose();
+  }
+
+  inspect() {
+    return `TreeSitterGrammar {scopeName: ${this.scopeName}}`;
+  }
+}
+
+function buildRegex(value) {
+  // Allow multiple alternatives to be specified via an array, for
+  // readability of the grammar file
+  if (Array.isArray(value)) value = value.map(_ => `(${_})`).join('|');
+  if (typeof value === 'string') return new RegExp(value);
+  return null;
+}