add symbol information support

Author: johan456789

extension.js

@@ -0,0 +1,43 @@
+const vscode = require('vscode');
+
+function activate(context) {
+    const selector = { language: 'lark', scheme: 'file' };
+    const provider = new LarkSymbolProvider();
+    context.subscriptions.push(
+        vscode.languages.registerDocumentSymbolProvider(selector, provider)
+    );
+}
+
+class LarkSymbolProvider {
+    provideDocumentSymbols(document) {
+        const symbols = [];
+        const termRe = /^\s*(?:[?!])?([A-Z0-9_]+)(?:\.\d+)?\s*:/; // optional ?/! prefix, uppercase identifiers, optional .n suffix
+        const ruleRe = /^\s*(?:[?!])?([a-z0-9_]+)(?:\.\d+)?\s*:/; // optional ?/! prefix, lowercase identifiers, optional .n suffix
+
+        for (let i = 0; i < document.lineCount; i++) {
+            const text = document.lineAt(i).text; // text content of the current line
+
+            const termMatch = termRe.exec(text);
+            if (termMatch) {
+                const name = termMatch[1]; // terminal name
+                const kind = vscode.SymbolKind.Constant;
+                const range = new vscode.Range(i, 0, i, text.length);
+                symbols.push(new vscode.DocumentSymbol(name, '', kind, range, range));
+                continue;
+            }
+
+            const ruleMatch = ruleRe.exec(text);
+            if (ruleMatch) {
+                const name = ruleMatch[1]; // rule name
+                const kind = vscode.SymbolKind.Function;
+                const range = new vscode.Range(i, 0, i, text.length);
+                symbols.push(new vscode.DocumentSymbol(name, '', kind, range, range));
+            }
+        }
+        return symbols;
+    }
+}
+
+function deactivate() { }
+
+module.exports = { activate, deactivate };

package.json

@@ -1,6 +1,6 @@
 {
     "name": "vscode-lark",
-    "version": "0.1.0",
+    "version": "0.2.0",
     "publisher": "dirk-thomas",
     "engines": {
         "vscode": "^1.2.0"
@@ -19,6 +19,10 @@
     "bugs": {
         "url": "https://github.com/dirk-thomas/vscode-lark/issues"
     },
+    "main": "./extension.js",
+    "activationEvents": [
+        "onLanguage:lark"
+    ],
     "contributes": {
         "languages": [
             {

syntaxes/lark.json

@@ -78,4 +78,4 @@
         }
     ],
     "scopeName": "source.lark"
-}
+}