Global settings

[wojciechczerniak]

Description

There are some differences between spreadsheet applications, and some of them can be compensated with customizable options.

Done	Option Name	Default	Description
✅	undoLimit	20	#295
✅	maxRows	40,000	#294 for #198
✅	maxColumns	18,278	#294 for #198
✅	licenseKey	undefined	#222
✅	nullDate	1900	Date is stored as a number of days since this date. There are a few "date systems" in the world of spreadsheets: 1900 Date System, 1904 Date System [1] #3
✅	nullYear	30	If date contains two-digit year it will be parsed as 19xx for numbers above this setting and 20xx for numbers below i.e 2029 but 1930. ODFF section 6.10.23
✅	leapYear1900	false	Callback that will allow handling leap year compatibility problem (introduced in Lotus 1-2-3) in various spreadsheets [2] #3
✅	decimalSeparator	.	Number format #42
✅	thousandSeparator	``	Number format #42
✅	language	enGB	Formula translations
✅	accentSensitive	false	String comparison #130
✅	caseFirst	"lower"	String comparison #130
✅	ignorePunctuation	false	String comparison #130
✅	localeLang	"en"	String comparison #130
✅	caseSensitive	false	Comparison operators =, <>, <, <=, >, and >= can be either case sensitive or insensitive. Exposed as an option in many spreadsheet apps
	intersectionOperator	(space)	ODFF section 5.5 and 6.4.12, default is ! but some implementations (XL, GS) use a space character. Example =SUM([.A1:.C4]![.B1:.B5]) vs =SUM(A1:C4 B1:B5) [3] #15
	unionOperator	,	ODFF section 6.4.13, default is ~ but some implementations use comma , or + character. Example =SUM([.A1:.C4];[.B1:.B5]) vs =SUM(A1:C4, B1:B5) [3] #15
	rangeOperator	:	Optional. There are no other, known implementations.
	sheetSeparator	.	In ODFF the dot . is a part of cell reference so there is no such thing as sheet separator (?), but most of the implementations ommit dots and it exist only when worksheet reference is needed
✅	functionArgSeparator	;	Default for ODFF is ; semicolon, mentioned in section 5.6 and 6.2. Might be a comma , in some implementations (GS 👀 ) #15
✅	useWildcards	true	#220
✅	useRegularExpresssions	false	#220
✅	matchWholeCell	true	#220
✅	precisionEpsilon	1e-13	Controls epsilon used with comparisons between numbers, and snap-to-zero behaviour #4
✅	precisionRounding	14	Controls number of digits the number is rounded with when API function getCellValue() #4
✅	smartRounding	false	Flag for snap-to-zero, rounding and safe-comparison (if true then those heuristics are used). #4
✅	parseDateTime		Callback that will allow to add more date formats and use any date library that developer prefers
✅	stringifyDateTime		Callback that will allow to add more date formats and use any date library that developer prefers

Where the defaults should be roughly compatible with XL implementation.

Host Defined Behaviors

ODFF [4] defines host defined behaviors in section 3.4. Some of them were already mentioned above. The full list is as follows:

The following properties are host-defined:

1. HOST-CASE-SENSITIVE: if true, text comparisons are case-sensitive. This influences the operators =, <>, <, <=, >, and >=, as well as database query functions that use them. Note that the EXACT function is always case-sensitive, regardless of this calculation setting.
2. HOST-PRECISION-AS-SHOWN: If true, calculations are performed using rounded values of those displayed; otherwise, calculations are performed using the precision of the underlying numeric representation.
   Note: This does not impose a particular numeric model. Since implementations may use binary representations, this rounding may be inexact for decimal values.
3. HOST-SEARCH-CRITERIA-MUST-APPLY-TO-WHOLE-CELL If true, the specified search criteria shall apply to the entire cell contents if it is a text match using = or <>; if not, only a subpart of the cell content needs to match the text.
4. HOST-AUTOMATIC-FIND-LABELS: if true, row and column labels are automatically found.
5. HOST-USE-REGULAR-EXPRESSIONS: If true, regular expressions are used for character string comparisons and when searching.
6. HOST-USE-WILDCARDS: If true, wildcards question mark '?' and asterisk '*' are used for character-string comparisons and when searching. Wildcards may be escaped with a tilde '~' character.
7. HOST-NULL-YEAR: This defines how to convert a two-digit year into a four-digit year. Each two-digit year value is interpreted as a year that equals or follows this year.
8. HOST-NULL-DATE: Defines the beginning of the epoch; a numeric date of 0 equals this date.
9. HOST-LOCALE: The locale to be used for locale-dependent operations, such as conversion of text to dates, or text to numbers.
10. HOST-ITERATION-STATUS: If enabled, iterative calculations of cyclic references are performed.
11. HOST-ITERATION-MAXIMUM-DIFFERENCE: If iterative calculations of cyclic references are enabled, the maximum absolute difference between calculation steps that all involved formula cells must yield for the iteration to end and yield a result.
12. HOST-ITERATION-STEPS: If iterative calculations of cyclic references are enabled, the maximum number of steps iterations that are performed if the results are not within HOST-ITERATION-MAXIMUM-DIFFERENCE.
    The function HOST-REFERENCE-RESOLVER(Reference) is implementation defined. This function takes as input a Unicode string containing a Reference according to section 4.8 and returns a resolved value.

This might be used as an inspiration.

References

[1] https://docs.microsoft.com/en-us/office/troubleshoot/excel/1900-and-1904-date-system
[2] https://docs.microsoft.com/en-us/office/troubleshoot/excel/determine-a-leap-year
[3] https://exceloffthegrid.com/cell-ranges-basic-things-99-users-dont-know/
[4] https://www.oasis-open.org/committees/documents.php?wg_abbrev=office
[5] https://help.libreoffice.org/6.3/en-US/text/shared/optionen/01060500.html?DbPAR=SHARED#bm_id3149399

[wojciechczerniak]

Very good idea from @swistak35 37c1d1d#commitcomment-36283037, we should validate customized separators and operators to avoid ambiguity in the parser.

[izulin]

Added to config as variables:

precisionEpsilon, 1e-13, Controls epsilon used with comparisons between numbers, and snap-to-zero behaviour.
precisionRounding, 14, Controls number of digits the number is rounded with when API function getCellValue()
smartRounding, true, Flag for snap-to-zero, rounding and safe-comparison (if true then those heuristics are used).

[izulin]

How is nullDate default being 1900 consistent with us right now counting the dates from 30/12/1899? Shouldnt there be more parameters?