Named Expressions: Structured References keywords (aka Stage 4)

Description

This is a part of the #126 Named Expressions Epic.

Goals

Finish the Structured References syntax to the point of full compatiblity with XL. It should be possible to export/import or copy/paste data between the two engines and get the same results.

• Parse and understand special keywords
• Range, union and intersection support for structured references
• Keep the whitespace

Keywords

A row can also be one of those helpful keywords:

[#All] will return all rows: data, headers and totals.
[#This Row] or [@] or @[ColumnName] relative to the row (default when row is omitted).
[#Headers] for the header row.
[#Totals] for summary/totals row.
[#Data] for data rows without headers and totals.

Reference operators

Reference operators can be applied (syntax depends on configuration #58). Use additional brackets around expressions with operators [ ].

Range: =Table[[Column 1]:[Column 2]] same as A2:B7 (colon)
Union: =Table[[Column 1]:[Column 2]],Table[[Column 4]:[Column 5]] same as A2:B7, D2:E7 (comma)
Intersection: =Table[[Column 1]:[Column 2]] Table[[Column 4]:[Column 5]] same as A2:B7 D2:E7 (space). Note: row and column is an union: [Row] [Column] but we can omit it

Whitespace should be preserved:

After the first left bracket ([ )
Preceding the last right bracket ( ]).
After a comma (, )

Begin by reviewing the Named Expressions epic (#126) and the structured-reference syntax, keyword cases, and operator examples listed here. Done means supporting the specified keywords, range/union/intersection operators, and whitespace preservation, with import/export or copy/paste producing compatible results with Excel.