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| Current File : /var/www/talentgenesis_admin_backend/node_modules/exceljs/dist/es5/csv/stream-converter.js |
"use strict";
// =======================================================================================================
// StreamConverter
//
// convert between encoding schemes in a stream
// Work in Progress - Will complete this at some point
let jconv;
class StreamConverter {
constructor(inner, options) {
this.inner = inner;
options = options || {};
this.innerEncoding = (options.innerEncoding || 'UTF8').toUpperCase();
this.outerEncoding = (options.outerEncoding || 'UTF8').toUpperCase();
this.innerBOM = options.innerBOM || null;
this.outerBOM = options.outerBOM || null;
this.writeStarted = false;
}
convertInwards(data) {
if (data) {
if (typeof data === 'string') {
data = Buffer.from(data, this.outerEncoding);
}
if (this.innerEncoding !== this.outerEncoding) {
data = jconv.convert(data, this.outerEncoding, this.innerEncoding);
}
}
return data;
}
convertOutwards(data) {
if (typeof data === 'string') {
data = Buffer.from(data, this.innerEncoding);
}
if (this.innerEncoding !== this.outerEncoding) {
data = jconv.convert(data, this.innerEncoding, this.outerEncoding);
}
return data;
}
addListener(event, handler) {
this.inner.addListener(event, handler);
}
removeListener(event, handler) {
this.inner.removeListener(event, handler);
}
write(data, encoding, callback) {
if (encoding instanceof Function) {
callback = encoding;
encoding = undefined;
}
if (!this.writeStarted) {
// if inner encoding has BOM, write it now
if (this.innerBOM) {
this.inner.write(this.innerBOM);
}
// if outer encoding has BOM, delete it now
if (this.outerBOM) {
if (data.length <= this.outerBOM.length) {
if (callback) {
callback();
}
return;
}
const bomless = Buffer.alloc(data.length - this.outerBOM.length);
data.copy(bomless, 0, this.outerBOM.length, data.length);
data = bomless;
}
this.writeStarted = true;
}
this.inner.write(this.convertInwards(data), encoding ? this.innerEncoding : undefined, callback);
}
read() {
// TBD
}
pipe(destination, options) {
const reverseConverter = new StreamConverter(destination, {
innerEncoding: this.outerEncoding,
outerEncoding: this.innerEncoding,
innerBOM: this.outerBOM,
outerBOM: this.innerBOM
});
this.inner.pipe(reverseConverter, options);
}
close() {
this.inner.close();
}
on(type, callback) {
switch (type) {
case 'data':
this.inner.on('data', chunk => {
callback(this.convertOutwards(chunk));
});
return this;
default:
this.inner.on(type, callback);
return this;
}
}
once(type, callback) {
this.inner.once(type, callback);
}
end(chunk, encoding, callback) {
this.inner.end(this.convertInwards(chunk), this.innerEncoding, callback);
}
emit(type, value) {
this.inner.emit(type, value);
}
}
module.exports = StreamConverter;
//# sourceMappingURL=stream-converter.js.map