https://bz.apache.org/bugzilla/show_bug.cgi?id=66401

            Bug ID: 66401
           Summary: FormulaParser does not recognize sheet names
                    containing quotes
           Product: POI
           Version: 5.2.2-FINAL
          Hardware: PC
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: SS Common
          Assignee: dev@poi.apache.org
          Reporter: mirko.sco...@addvalue.it
  Target Milestone: ---

Created attachment 38454
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=38454&action=edit
FormulaParser.java

I have an Excel file with a sheet whose name contains a quote. This name is
referenced in a formula on a cell of a different sheet. 

Example:

Sheet name -> Valle d'Aosta
Sheet reference in formula -> 'Valle d''Aosta'!A1

The FormulaParser creates a Ref3DPxg instance having:

_firstSheetName -> Valle dAosta

I have found this issue in version 5.2.3. FormulaParser eats the two
consecutive quotes at line 1185 when, once they are detected, it scrolls to the
next char without appending them to the string builder.

Adding at line 1185 of FormulaParser the following statement solved my issue.

sb.appendCodepoint(look);

See the patched FormulaParser.java. I wonder if you could insert this fix in
the next release.

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