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utils.js
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utils.js
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const fs = require('fs');
// useful stuff
const inherits = function(cls, superCtor, statics, prototype) {
// eslint-disable-next-line no-underscore-dangle
cls.super_ = superCtor;
if (!prototype) {
prototype = statics;
statics = null;
}
if (statics) {
Object.keys(statics).forEach(i => {
Object.defineProperty(cls, i, Object.getOwnPropertyDescriptor(statics, i));
});
}
const properties = {
constructor: {
value: cls,
enumerable: false,
writable: false,
configurable: true,
},
};
if (prototype) {
Object.keys(prototype).forEach(i => {
properties[i] = Object.getOwnPropertyDescriptor(prototype, i);
});
}
cls.prototype = Object.create(superCtor.prototype, properties);
};
// eslint-disable-next-line no-control-regex
const xmlDecodeRegex = /[<>&'"\x7F\x00-\x08\x0B-\x0C\x0E-\x1F]/;
const utils = {
nop() {},
promiseImmediate(value) {
return new Promise(resolve => {
if (global.setImmediate) {
setImmediate(() => {
resolve(value);
});
} else {
// poorman's setImmediate - must wait at least 1ms
setTimeout(() => {
resolve(value);
}, 1);
}
});
},
inherits,
dateToExcel(d, date1904) {
// eslint-disable-next-line no-mixed-operators
return 25569 + d.getTime() / (24 * 3600 * 1000) - (date1904 ? 1462 : 0);
},
excelToDate(v, date1904) {
// eslint-disable-next-line no-mixed-operators
const millisecondSinceEpoch = Math.round((v - 25569 + (date1904 ? 1462 : 0)) * 24 * 3600 * 1000);
return new Date(millisecondSinceEpoch);
},
parsePath(filepath) {
const last = filepath.lastIndexOf('/');
return {
path: filepath.substring(0, last),
name: filepath.substring(last + 1),
};
},
getRelsPath(filepath) {
const path = utils.parsePath(filepath);
return `${path.path}/_rels/${path.name}.rels`;
},
xmlEncode(text) {
const regexResult = xmlDecodeRegex.exec(text);
if (!regexResult) return text;
let result = '';
let escape = '';
let lastIndex = 0;
let i = regexResult.index;
for (; i < text.length; i++) {
const charCode = text.charCodeAt(i);
switch (charCode) {
case 34: // "
escape = '"';
break;
case 38: // &
escape = '&';
break;
case 39: // '
escape = ''';
break;
case 60: // <
escape = '<';
break;
case 62: // >
escape = '>';
break;
case 127:
escape = '';
break;
default: {
if (charCode <= 31 && (charCode <= 8 || (charCode >= 11 && charCode !== 13))) {
escape = '';
break;
}
continue;
}
}
if (lastIndex !== i) result += text.substring(lastIndex, i);
lastIndex = i + 1;
if (escape) result += escape;
}
if (lastIndex !== i) return result + text.substring(lastIndex, i);
return result;
},
xmlDecode(text) {
return text.replace(/&([a-z]*);/g, c => {
switch (c) {
case '<':
return '<';
case '>':
return '>';
case '&':
return '&';
case ''':
return '\'';
case '"':
return '"';
default:
return c;
}
});
},
validInt(value) {
const i = parseInt(value, 10);
return !Number.isNaN(i) ? i : 0;
},
isDateFmt(fmt) {
if (!fmt) {
return false;
}
// must remove all chars inside quotes and []
fmt = fmt.replace(/\[[^\]]*]/g, '');
fmt = fmt.replace(/"[^"]*"/g, '');
// then check for date formatting chars
const result = fmt.match(/[ymdhMsb]+/) !== null;
return result;
},
fs: {
exists(path) {
return new Promise(resolve => {
fs.access(path, fs.constants.F_OK, err => {
resolve(!err);
});
});
},
},
toIsoDateString(dt) {
return dt.toIsoString().subsstr(0, 10);
},
parseBoolean(value) {
return value === true || value === 'true' || value === 1 || value === '1';
},
*range(start, stop, step = 1) {
const compareOrder = step > 0 ? (a, b) => a < b : (a, b) => a > b;
for (let value = start; compareOrder(value, stop); value += step) {
yield value;
}
},
toSortedArray(values) {
const result = Array.from(values);
// Note: per default, `Array.prototype.sort()` converts values
// to strings when comparing. Here, if we have numbers, we use
// numeric sort.
if (result.every(item => Number.isFinite(item))) {
const compareNumbers = (a, b) => a - b;
return result.sort(compareNumbers);
}
return result.sort();
},
objectFromProps(props, value = null) {
// *Note*: Using `reduce` as `Object.fromEntries` requires Node 12+;
// ExcelJs is >=8.3.0 (as of 2023-10-08).
// return Object.fromEntries(props.map(property => [property, value]));
return props.reduce((result, property) => {
result[property] = value;
return result;
}, {});
},
};
module.exports = utils;