Issue1673 case within brackets

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -2228,10 +2228,17 @@ SelectExpressionItem SelectExpressionItem():
  Alias alias = null;
 }
 {
- expression=Expression() { selectExpressionItem = new SelectExpressionItem(); selectExpressionItem.setExpression(expression); }
+ (
+ LOOKAHEAD( Condition() ) expression = Condition()
+ |
+ LOOKAHEAD( 3 ) expression = ConcatExpression()
+ |
+ expression=Expression()
+ ) { selectExpressionItem = new SelectExpressionItem(); selectExpressionItem.setExpression(expression); }
  [ LOOKAHEAD(2) alias=Alias() { selectExpressionItem.setAlias(alias); }] { return selectExpressionItem; }
 }
 
+
 SelectItem SelectItem() #SelectItem:
 {
  SelectItem selectItem = null;

src/test/java/net/sf/jsqlparser/expression/CaseExpressionTest.java

@@ -81,4 +81,29 @@ public void testCaseAndSwitch() throws JSQLParserException {
  public void testCaseOrSwitch() throws JSQLParserException {
  TestUtils.assertExpressionCanBeParsedAndDeparsed("CASE true OR false WHEN true THEN 1 ELSE 2 END", true);
  }
+
+ @Test
+ public void testCaseInsideBrackets() throws JSQLParserException {
+ String sqlStr = "SELECT ( CASE\n"
+ + " WHEN something\n"
+ + " THEN CASE\n"
+ + " WHEN something2\n"
+ + " THEN 1\n"
+ + " ELSE 0\n"
+ + " END + 1\n"
+ + " ELSE 0\n"
+ + " END ) + 1 \n"
+ + "FROM test";
+
+ TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+
+ sqlStr = "SELECT\n"
+ + "(CASE WHEN FIELD_A=0 THEN FIELD_B\n"
+ + "WHEN FIELD_C >FIELD_D THEN (CASE WHEN FIELD_A>0 THEN\n"
+ + "(FIELD_B)/(FIELD_A/(DATEDIFF(DAY,:started,:end)+1))\n"
+ + "ELSE 0 END)-FIELD_D ELSE 0 END)*FIELD_A/(DATEDIFF(DAY,:started,:end)+1) AS UNNECESSARY_COMPLEX_EXPRESSION\n"
+ + "FROM TEST";
+
+ TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+ }
 }