Fixes #66

release/main.js

@@ -1959,7 +1959,7 @@ var BeginEndRule = /** @class */ (function (_super) {
         var _this = _super.call(this, $location, id, name, contentName) || this;
         _this._begin = new RegExpSource(begin, _this.id);
         _this.beginCaptures = beginCaptures;
-        _this._end = new RegExpSource(end, -1);
+        _this._end = new RegExpSource(end ? end : '\uFFFF', -1);
         _this.endHasBackReferences = _this._end.hasBackReferences;
         _this.endCaptures = endCaptures;
         _this.applyEndPatternLast = applyEndPatternLast || false;

src/rule.ts

@@ -440,7 +440,7 @@ export class BeginEndRule extends Rule {
 		super($location, id, name, contentName);
 		this._begin = new RegExpSource(begin, this.id);
 		this.beginCaptures = beginCaptures;
-		this._end = new RegExpSource(end, -1);
+		this._end = new RegExpSource(end ? end : '\uFFFF', -1);
 		this.endHasBackReferences = this._end.hasBackReferences;
 		this.endCaptures = endCaptures;
 		this.applyEndPatternLast = applyEndPatternLast || false;

test-cases/suite1/fixtures/66.plist

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <dict>
+        <key>scopeName</key>
+        <string>text.test</string>
+
+        <key>patterns</key>
+        <array>
+            <dict>
+                <key>begin</key><string>^.</string>
+                <key>name</key><string>comment</string>
+            </dict>
+
+            <dict>
+                <key>begin</key><string>.</string>
+                <key>name</key><string>invalid</string>
+            </dict>
+        </array>
+    </dict>
+</plist>

test-cases/suite1/tests.json

@@ -1422,5 +1422,57 @@
 				]
 			}
 		]
+	},
+	{
+		"grammars": [
+			"fixtures/66.plist"
+		],
+		"grammarPath": "fixtures/66.plist",
+		"desc": "Issue #66",
+		"lines": [
+			{
+				"line": "Just some text",
+				"tokens": [
+					{
+						"value": "J",
+						"scopes": [
+							"text.test",
+							"comment"
+						]
+					},
+					{
+						"value": "ust some text",
+						"scopes": [
+							"text.test",
+							"comment"
+						]
+					}
+				]
+			},
+			{
+				"line": "which contains undefined and then",
+				"tokens": [
+					{
+						"value": "which contains undefined and then",
+						"scopes": [
+							"text.test",
+							"comment"
+						]
+					}
+				]
+			},
+			{
+				"line": "more text",
+				"tokens": [
+					{
+						"value": "more text",
+						"scopes": [
+							"text.test",
+							"comment"
+						]
+					}
+				]
+			}
+		]
 	}
 ]