Fix lexer for empty input.

core/SqlLexer.cpp

@@ -148,7 +148,9 @@ bool SqlLexer::nextBasicToken(int &startpos, int &length, BasicTokenType &tokent
 //				m_state = LexerState::InBlockComment;
 //			}
 			else if (c == QChar::Null) {
-				break;
+				length = 0;
+				tokentype = BasicTokenType::End;
+				return true;
 			}
 			else if (c == '$') {
                 return parseDollarQuote(startpos, length, tokentype, out);                

core/SqlLexer.h

@@ -52,7 +52,7 @@ public:
 	SqlToken nextBasicToken()
 	{
 		SqlToken token;
-		token.ok = !nextBasicToken(token.startPos, token.length, token.tokenType, token.out);
+		token.ok = nextBasicToken(token.startPos, token.length, token.tokenType, token.out);
 		return token;
 	}
 

tests/pglabtests/tst_SqlLexer.cpp

@@ -5,6 +5,19 @@
 
 using namespace testing;
 
+TEST(SqlLexer, emptyInput)
+{
+	QString input;
+	SqlLexer lexer(input, LexerState::Null);
+
+	int startpos, length;
+	BasicTokenType tokentype;
+	QString out;
+	lexer.nextBasicToken(startpos, length, tokentype, out);
+
+	ASSERT_THAT(startpos, Eq(0));
+	ASSERT_THAT(tokentype, Eq(BasicTokenType::End));
+}
 
 TEST(SqlLexer, lexer)
 {