TextXLSXArray logic

define

,chunks=[
     `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>`
    ,`<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">`
    +`<Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>`
    +`<Default Extension="xml" ContentType="application/xml"/>`
    +`<Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>`
    ,i=>`<Override PartName="/xl/worksheets/sheet${1+i}.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>`
    ,`</Types>`
    ,`<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">`
    +`<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/>`
    +`</Relationships>`
    ,`<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><sheets>`
    ,fs=>(names=>i=>{
        const name=names[i]
        if(31<name.length||name.match(/[/?*\[\]:']/)||!name||names.lastIndexOf(name)!==i)throw new Error()
        return`<sheet name="${name.toXMLAttribute()}" sheetId="${1+i}" r:id="rId${1+i}"/>`
    })(map(false,fs,f=>f.name.replace(/\.[^/.]+$/,``)))
    ,`</sheets></workbook>`
    ,`<Relationships xmlns="http://schemas.openxmlformats.org/officeDocument/2006/relationships">`
    ,i=>`<Relationship Id="rId${1+i}" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet${1+i}.xml"/>`
    ,`</Relationships>`
    ,`<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><sheetData>`
    ,r=>`<row r="${r}">`
    ,(r,v,i)=>`<c r="${new Col(i).alphabet.toUpperCase()}${r}" t="inlineStr"><is><t>${v}</t></is></c>`
    ,`</row>`
    ,`</sheetData></worksheet>`
]

const vs=Array(4+fs.length),declaration=encoder.encode(chunks[0])

,getFile=async(v,c)=>{
    let controller
    const blob=new Response(new ReadableStream({
        start:v=>{controller=v}
    })).blob()
    controller.enqueue(declaration)
    await c(v=>controller.enqueue(encoder.encode(v)))
    controller.close()
    const file=new File([await blob],v[1])
    Reflect.defineProperty(file,`webkitRelativePath`,{value:v[0]+v[1]})
    return file
}

vs[0]=await getFile(targets[0],enqueue=>enqueue(chunks[1])||forEach(false,fs.length,(_,i)=>enqueue(chunks[2](i)))||enqueue(chunks[3]))

vs[1]=await getFile(targets[1],enqueue=>enqueue(chunks[4]))

vs[2]=await getFile(targets[2],enqueue=>enqueue(chunks[5])||(c=>forEach(false,fs.length,(_,i)=>enqueue(c(i))))(chunks[6](fs))||enqueue(chunks[7]))

vs[3]=await getFile(targets[3],enqueue=>enqueue(chunks[8])||forEach(false,fs.length,(_,i)=>enqueue(chunks[9](i)))||enqueue(chunks[10]))

await forEach(true,fs.length,async(_,i)=>vs[4+i]=await getFile(targets[4](i),async enqueue=>{
    enqueue(chunks[11])
    const scanner=new Scanner(decoder,fs[i].stream())
    for(let r=0;null!=await scanner.findInLine(`[^\r\n]+`);){
        enqueue(chunks[12](++r))
        forEach(false,scanner.match()[0].splitFrom(`"(?:""|[^"])*"|[^,]+`),(v,i)=>undefined===v||undefined===(v=chunks[13](r,v.replace(/^"(.*)"$|^$/s,`$1`).replace(/""/g,`"`).toXMLText(),i))||enqueue(v))
        enqueue(chunks[14])
    }
    enqueue(chunks[15])
}))

return vs