js-xlsx issue #563

write.js

/* writing feature test -- look for TEST: in comments */
/* vim: set ts=2: */

/* original data */
var data = [];
for(var i = 0; i < 1000; ++i) {
	var row = []
	row.push(String(i) + ":" + String(i));
	for(var j = row.length; j < 2000; ++j) {
		row.push(j*i);
	}
	data.push(row);
}

var ws_name = "SheetJS";

//console.log("Sheet Name: " + ws_name);
//console.log("Data: "); for(var i=0; i!=data.length; ++i) console.log(data[i]);



/* require XLSX */
if(typeof XLSX === "undefined") {
	try { XLSX = require('xlsx'); } catch(e) {
		try { XLSX = require('./'); } catch(e) {
			XLSX = require('../');
} } }

/* dummy workbook constructor */
function Workbook() {
	if(!(this instanceof Workbook)) return new Workbook();
	this.SheetNames = [];
	this.Sheets = {};
}
var wb = new Workbook();


/* TODO: date1904 logic */
function datenum(v, date1904) {
	if(date1904) v+=1462;
	var epoch = Date.parse(v);
	return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

/* convert an array of arrays in JS to a CSF spreadsheet */
function sheet_from_array_of_arrays(data, opts) {
	var ws = {};
	var range = {s: {c:10000000, r:10000000}, e: {c:0, r:0 }};
	for(var R = 0; R != data.length; ++R) {
		for(var C = 0; C != data[R].length; ++C) {
			if(range.s.r > R) range.s.r = R;
			if(range.s.c > C) range.s.c = C;
			if(range.e.r < R) range.e.r = R;
			if(range.e.c < C) range.e.c = C;
			var cell = {v: data[R][C] };
			if(cell.v == null) continue;
			var cell_ref = XLSX.utils.encode_cell({c:C,r:R});

			/* TEST: proper cell types and value handling */
			if(typeof cell.v === 'number') cell.t = 'n';
			else if(typeof cell.v === 'boolean') cell.t = 'b';
			else if(cell.v instanceof Date) {
				cell.t = 'n'; cell.z = XLSX.SSF._table[14];
				cell.v = datenum(cell.v);
			}
			else cell.t = 's';
			ws[cell_ref] = cell;
		}
	}

	/* TEST: proper range */
	if(range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
	return ws;
}
var ws = sheet_from_array_of_arrays(data);

/* TEST: add worksheet to workbook */
wb.SheetNames.push(ws_name);
wb.Sheets[ws_name] = ws;
wb.SheetNames.push(ws_name + "A"); wb.Sheets[ws_name + "A"] = ws;
wb.SheetNames.push(ws_name + "B"); wb.Sheets[ws_name + "B"] = ws;
wb.SheetNames.push(ws_name + "C"); wb.Sheets[ws_name + "C"] = ws;
wb.SheetNames.push(ws_name + "D"); wb.Sheets[ws_name + "D"] = ws;
wb.SheetNames.push(ws_name + "E"); wb.Sheets[ws_name + "E"] = ws;
wb.SheetNames.push(ws_name + "F"); wb.Sheets[ws_name + "F"] = ws;
wb.SheetNames.push(ws_name + "G"); wb.Sheets[ws_name + "G"] = ws;

/* write file */
console.log('xlsx');
XLSX.writeFile(wb, 'sheetjs.xlsx', {compression:true});