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Sheet.js
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Sheet.js
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'use strict';
const fs = require('fs');
const async = require('async');
const sheetFront = '<?xml version="1.0" encoding="utf-8"?><x:worksheet xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><x:sheetPr><x:outlinePr summaryBelow="1" summaryRight="1" /></x:sheetPr><x:sheetViews><x:sheetView tabSelected="0" workbookViewId="0" /></x:sheetViews><x:sheetFormatPr defaultRowHeight="15" />';
const sheetBack = '</x:sheetData><x:printOptions horizontalCentered="0" verticalCentered="0" headings="0" gridLines="0" /><x:pageMargins left="0.75" right="0.75" top="0.75" bottom="0.5" header="0.5" footer="0.75" /><x:pageSetup paperSize="1" scale="100" pageOrder="downThenOver" orientation="default" blackAndWhite="0" draft="0" cellComments="none" errors="displayed" /><x:headerFooter /><x:tableParts count="0" /></x:worksheet>';
module.exports = (path, config, shareStrings, convertedShareStrings) => {
return new Promise((resolve, reject) => {
let cols = config.cols, data = config.rows, colsLength = cols.length, p, styleIndex, k = 0, cn = 1, sheetPos = 0;
let sheet;
let write = (str, callback) => sheet.write(str, callback);
let openSheet = (callback) => {
sheet = fs.createWriteStream(path, {
autoclose: false
});
sheet.on('open', () => {
callback();
});
};
let writeInitialSheetContent = (callback) => {
return write(sheetFront, callback);
};
let addColumnHeaders = (callback) => {
return async.waterfall([
(callback) => {
return write('<cols>', callback);
},
(callback) => {
return async.eachSeries(cols, (col, callback) => {
let colStyleIndex = col.styleIndex || 0;
let res = '<x:col min="' + cn + '" max="' + cn + '" width="' + (col.width ? col.width : 10) + '" customWidth="1" style="' + colStyleIndex + '"/>';
cn++;
return write(res, callback);
}, callback);
},
(callback) => {
return write('</cols><x:sheetData>', callback);
}
], callback);
};
let writeRows = (callback) => {
let addMetadataToColumns = (callback) => {
return async.eachSeries(cols, (col, callback) => {
let colStyleIndex = col.captionStyleIndex || 0;
let res = addStringCol(getColumnLetter(k + 1) + 1, col.caption, colStyleIndex, shareStrings);
k++;
convertedShareStrings += res[1];
return write('<x:row r="1" spans="1:' + colsLength + '">' + res[0] + '</x:row>', callback);
}, callback);
};
let subscribeToData = (callback) => {
data.on('data', addRow);
data.on('end', () => process.nextTick(callback));
};
let i = -1;
let addRow = (r) => {
if (r == null) return;
let j, cellData, currRow, cellType;
i++;
currRow = i + 2;
let row = '<x:row r="' + currRow + '" spans="1:' + colsLength + '">';
for (j = 0; j < colsLength; j++) {
styleIndex = cols[j].styleIndex;
cellData = r[j];
cellType = cols[j].type;
if (typeof cols[j].beforeCellWrite === 'function') {
let e = {
rowNum: currRow,
styleIndex: styleIndex,
cellType: cellType
};
cellData = cols[j].beforeCellWrite(r, cellData, e);
styleIndex = e.styleIndex || styleIndex;
cellType = e.cellType;
}
switch (cellType) {
case 'number':
row += addNumberCol(getColumnLetter(j + 1) + currRow, cellData, styleIndex);
break;
case 'date':
row += addDateCol(getColumnLetter(j + 1) + currRow, cellData, styleIndex);
break;
case 'bool':
row += addBoolCol(getColumnLetter(j + 1) + currRow, cellData, styleIndex);
break;
default:
let res = addStringCol(getColumnLetter(j + 1) + currRow, cellData, styleIndex, shareStrings, convertedShareStrings);
row += res[0];
convertedShareStrings += res[1];
}
}
row += '</x:row>';
return write(row, () => { });
};
let addRows = (callback) => {
data.forEach(addRow);
return callback();
};
if (Array.isArray(data)) {
return async.waterfall([
addMetadataToColumns,
addRows
], callback);
} else {
return async.waterfall([
addMetadataToColumns,
subscribeToData
], callback);
}
};
let writeFinalSheetContent = (callback) => write(sheetBack, callback);
let closeSheet = (callback) => {
sheet.on('close', callback);
sheet.destroySoon();
};
async.waterfall([
openSheet,
writeInitialSheetContent,
addColumnHeaders,
writeRows,
writeFinalSheetContent,
closeSheet
], () => {
resolve({
convertedShareStrings: convertedShareStrings,
shareStrings: shareStrings
});
});
});
};
let startTag = (obj, tagName, closed) => {
let result = '<' + tagName, p;
for (p in obj) {
result += ' ' + p + '=' + obj[p];
}
if (!closed) {
result += '>';
} else {
result += '/>';
}
return result;
};
let endTag = (tagName) => {
return '</' + tagName + '>';
};
let addNumberCol = (cellRef, value, styleIndex) => {
styleIndex = styleIndex || 0;
if (value === null) {
return '';
} else {
return '<x:c r="' + cellRef + '" s="' + styleIndex + '" t="n"><x:v>' + value + '</x:v></x:c>';
}
};
let addDateCol = (cellRef, value, styleIndex) => {
styleIndex = styleIndex || 1;
if (value === null) {
return '';
} else {
return '<x:c r="' + cellRef + '" s="' + styleIndex + '" t="n"><x:v>' + value + '</x:v></x:c>';
}
};
let addBoolCol = (cellRef, value, styleIndex) => {
styleIndex = styleIndex || 0;
if (value === null) {
return '';
}
if (value) {
value = 1;
} else {
value = 0;
}
return '<x:c r="' + cellRef + '" s="' + styleIndex + '" t="b"><x:v>' + value + '</x:v></x:c>';
};
let addStringCol = (cellRef, value, styleIndex, shareStrings) => {
styleIndex = styleIndex || 0;
if (value === null) {
return [
'',
''
];
}
if (typeof value === 'string') {
value = value.replace(/&/g, '&').replace(/'/g, ''').replace(/>/g, '>').replace(/</g, '<');
}
let convertedShareStrings = '';
let i = shareStrings.indexOf(value);
if (i < 0) {
i = shareStrings.push(value) - 1;
convertedShareStrings = '<x:si><x:t>' + value + '</x:t></x:si>';
}
return [
'<x:c r="' + cellRef + '" s="' + styleIndex + '" t="s"><x:v>' + i + '</x:v></x:c>',
convertedShareStrings
];
};
let getColumnLetter = (col) => {
if (col <= 0) {
throw 'col must be more than 0';
}
let array = [];
while (col > 0) {
let remainder = col % 26;
col /= 26;
col = Math.floor(col);
if (remainder === 0) {
remainder = 26;
col--;
}
array.push(64 + remainder);
}
return String.fromCharCode.apply(null, array.reverse());
};