streaming writer set default value like non-streaming one

[mengpromax]

PR Details

1. make receiver name of xlsxC unified.
2. streaming writer can set cell default value like non-streaming one.

Related Issue

#2151

Motivation and Context

We have a legacy impl using the non-streamingly writer to write excel, in which we use setCellDefault func to set raw value.
Now i want to migrate some logic to streaming writer impl, i found no a corresponding impl setCellDefault for steaming write. :)

How Has This Been Tested

• UT test for pass SetCellDefaultValue to setCellValFunc.
• Test in our business scenarios.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.23%. Comparing base (5bd9647) to head (d7ba070).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2152   +/-   ##
=======================================
  Coverage   99.23%   99.23%           
=======================================
  Files          32       32           
  Lines       30273    30278    +5     
=======================================
+ Hits        30042    30047    +5     
  Misses        153      153           
  Partials       78       78           

Flag	Coverage Δ
unittests	99.23% <100.00%> (+<0.01%)	⬆️

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[mengpromax]

@xuri ptal， this is test suite for our biz already.

[xuri]

Sure, I need to take some time to review this PR.

[Copilot]

Pull Request Overview

This PR enhances the streaming writer by adding support for setting a cell's default value similarly to the non‑streaming writer and unifies receiver naming for consistency.

• Added support for a new SetCellDefaultValue type in the streaming writer flow.
• Updated test cases including expected cell counts and row indices to reflect the new behavior.
• Renamed receiver variables in rows.go for uniformity in methods handling cell XML attributes and elements.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
stream_test.go	Updated tests to exercise SetCellDefaultValue and adjusted expected cell count.
stream.go	Added handling for SetCellDefaultValue in setCellValFunc.
rows.go	Unified receiver naming from “cell” to “c” for consistency.
cell.go	Introduced SetCellDefaultValue type and modified setCellDefault logic.

Comments suppressed due to low confidence (2)

cell.go:588

• Clarify the rationale behind setting c.T to an empty string for default cell values; consider expanding the comment to reference the intended behavior difference between streaming and non-streaming writers.

		c.T, c.V, c.IS = "", "", nil // I modify this to set c.T = "" explicitly to avoid misunderstanding of c.Type can be value

stream_test.go:157

• [nitpick] Add a comment to explain the updated expected cell count, clarifying how the new SetCellDefaultValue rows affect the total cell count in the test.

	assert.Equal(t, 2559468, cells)

[xuri]

Thanks for your PR. I don't think this changes is required.

The cell value with the string data type will be storage as inlineStr in the normal mode SetCellDefault function, the SetCellValue and SetCellStr function will storage cell value as shared string table. That's the major different between them.

But in the stream writer, the SetRow function always storage string data type cell value as inlineStr, the behavior same as normal mode SetCellDefault function, so we needn't introduce new SetCellDefaultValue for this.

[xuri]

If set specific characters, it will caused corrupted workbook. For example:

err := sw.SetRow("A1", []interface{}{excelize.SetCellDefaultValue("<>"))

[mengpromax]

func (c *xlsxC) setCellDefault(value string) {
	if ok, _, _ := isNumeric(value); !ok {
		if value != "" {
			c.setInlineStr(value)
			c.IS.T.Val = value
			return
		}

		c.T, c.V, c.IS = "", "", nil // I modify this to set c.T = "" explicitly to avoid misunderstanding of c.Type can be value
		return
	}
	c.T, c.V = "", value
}


I think the difference between setCellDefault and setCellString is the former can set c.T to a empty string, i didn't find the path to do that using streaming writer. 

[xuri]

The cell type is empty only for no-numeric cell values, here an example for different data type of set cell values with SetCellDefault and stream mode function:

package main

import (
    "fmt"

    "github.com/xuri/excelize/v2"
)

func main() {
    f := excelize.NewFile()
    defer func() {
        if err := f.Close(); err != nil {
            fmt.Println(err)
        }
    }()
    if err := f.SetCellDefault("Sheet1", "A1", "100.1588"); err != nil {
        fmt.Println(err)
        return
    }
    if err := f.SetCellDefault("Sheet1", "B1", "<>"); err != nil {
        fmt.Println(err)
        return
    }

    _, err := f.NewSheet("Sheet2")
    if err != nil {
        fmt.Println(err)
        return
    }
    sw, err := f.NewStreamWriter("Sheet2")
    if err != nil {
        fmt.Println(err)
        return
    }
    if err := sw.SetRow("A1", []interface{}{100.1588, "<>"}); err != nil {
        fmt.Println(err)
        return
    }
    if err := sw.Flush(); err != nil {
        fmt.Println(err)
        return
    }
    if err := f.SaveAs("Book1.xlsx"); err != nil {
        fmt.Println(err)
    }
}

the generated XML element of Sheet1!A1 is same as Sheet2!A1, and Sheet2!B1 is same as Sheet2!B1:

<row r="1">
    <c r="A1">
        <v>100.1588</v>
    </c>
    <c r="B1" t="inlineStr">
        <is>
            <t>&lt;&gt;</t>
        </is>
    </c>
</row>

So you can using stream writer to generats same things that same as SetCellDefault function.

[mengpromax]

Thanks. Got it, you are right. I will check it again.

[xuri]

I've closed this, if you have any questions, please let me know, and I can reopen this anytime.