Add GetRows to retrieve unformatted cell values

[tgulacsi]

This allows converting to time.Time without goint throguh the formatting and parsing steps.
Use the stored floating point number insted.

The only remaining step is a helper that decides whether the cell is a date or not (sth. like File.Styles.CellXfs.Xf[cell.S].NumFmtID IN (14, 15, 16, 17, 22)).

Checklist

• My code follows the code style of this project.
• [-] My change requires a change to the documentation.
• [-] I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• [-] I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #621 into v2 will decrease coverage by 0.08%.
The diff coverage is 85.18%.

@@            Coverage Diff             @@
##               v2     #621      +/-   ##
==========================================
- Coverage   96.67%   96.59%   -0.09%     
==========================================
  Files          30       30              
  Lines        8932     8948      +16     
==========================================
+ Hits         8635     8643       +8     
- Misses        183      191       +8     
  Partials      114      114              

Impacted Files	Coverage Δ
date.go	95.91% <0.00%> (-4.09%)	⬇️
lib.go	100.00% <100.00%> (ø)
rows.go	94.61% <100.00%> (-1.07%)	⬇️

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[tgulacsi]

Shall I update this? Is there any possibility that this may be merged or at least reviewed?

[tgulacsi]

Hi @xuri, shall I update this?

[xuri]

Hi @tgulacsi, thanks for your PR. I need some time to review.

[codecov-io]

Codecov Report

Merging #621 (7c148ab) into v2 (71829c5) will decrease coverage by 0.05%.
The diff coverage is 80.95%.

@@            Coverage Diff             @@
##               v2     #621      +/-   ##
==========================================
- Coverage   96.73%   96.67%   -0.06%     
==========================================
  Files          31       31              
  Lines        8626     8635       +9     
==========================================
+ Hits         8344     8348       +4     
- Misses        160      165       +5     
  Partials      122      122              

Impacted Files	Coverage Δ
date.go	96.59% <0.00%> (-3.41%)	⬇️
rows.go	93.15% <92.85%> (-0.55%)	⬇️
lib.go	100.00% <100.00%> (ø)

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[xuri]

Hi @tgulacsi thanks for your PR, and sorry for my so late reply. I suggest adding an option for columns and rows iterator, to support specified if apply number format, instead of adding the new function RawColumns, so I'll close this.

[tgulacsi]

Ok, I can add a "rawValues bool" to Cols, Rows, rowsXMLIterator & co. structs, but how to allow setting these parameters?
Export them, or add a "SetRawOption(bool)" method to them?

[xuri]

Hi @tgulacsi, I've added optional parameters for the GetCellValue, GetRows, GetCols, Rows, and Cols, to support specific read cells with raw value, please try upgrade to the master branch. For example, disable apply number format on get rows:

rows, err := f.GetRows("Sheet1", excelize.Options{RawCellValue: true})

[tgulacsi]

Thanks, that's perfect!