fix unclosed block detection

add parser tests (codex)

package-lock.json

@@ -303,7 +303,6 @@
       "integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -489,7 +488,6 @@
       "integrity": "sha512-LEyamqS7W5HB3ujJyvi0HQK/dtVINZvd5mAAp9eT5S/ujByGjiZLCzPcHVzuXbpJDJF/cxwHlfceVUDZ2lnSTw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.8.0",
         "@eslint-community/regexpp": "^4.12.1",

package.json

@@ -57,6 +57,7 @@
   "scripts": {
     "vscode:prepublish": "npm run compile",
     "compile": "tsc -p ./",
+    "test": "npm run compile && node --test test/*.test.js",
     "watch": "tsc -watch -p ./",
     "lint": "eslint src --ext ts"
   },

src/parser.ts

@@ -41,8 +41,9 @@ export class EftlParser {
 
         // Check for unclosed blocks
         for (const block of this.blockStack) {
+            const expectedClose = this.getMatchingClose(block.type);
             this.errors.push({
-                message: `Unclosed block: ${block.token.value}`,
+                message: `Unclosed tag: ${block.token.value} (expected ${expectedClose})`,
                 line: block.token.line,
                 column: block.token.column,
                 length: block.token.length

test/parser.test.js

@@ -0,0 +1,48 @@
+const assert = require('node:assert/strict');
+const test = require('node:test');
+
+const { EftlParser } = require('../out/parser');
+const { EftlTokenizer } = require('../out/tokenizer');
+
+function parse(source) {
+    const { tokens, errors: tokenizerErrors } = new EftlTokenizer(source).tokenize();
+    assert.deepEqual(tokenizerErrors, []);
+    return new EftlParser(tokens).parse().errors;
+}
+
+test('accepts a correctly closed VAR tag', () => {
+    assert.deepEqual(parse('[VAR][/VAR]'), []);
+});
+
+test('reports a VAR tag without its closing tag', () => {
+    assert.deepEqual(parse('[VAR]'), [{
+        message: 'Unclosed tag: [VAR] (expected [/VAR])',
+        line: 1,
+        column: 1,
+        length: 5
+    }]);
+});
+
+test('reports an unexpected closing tag', () => {
+    const errors = parse('[/VAR]');
+
+    assert.equal(errors.length, 1);
+    assert.match(errors[0].message, /Unexpected closing tag/);
+});
+
+test('reports every unclosed nested tag at its opening token', () => {
+    assert.deepEqual(parse('[EFTL]\n[VAR]'), [
+        {
+            message: 'Unclosed tag: [EFTL] (expected [/EFTL])',
+            line: 1,
+            column: 1,
+            length: 6
+        },
+        {
+            message: 'Unclosed tag: [VAR] (expected [/VAR])',
+            line: 2,
+            column: 1,
+            length: 5
+        }
+    ]);
+});