Hello
I try combine few streams in one and then parse its in separated streams
And now for me not clear how to pause of transform.
When i call method "done" (indicate stream continue transform) in Readable
stream - throw exception "Error: no writecb in Transform class".
Thanks for help!
var fs = require('fs');
var Readable = require('stream').Readable;
var Transform = require('stream').Transform;
//function of streams separate
function split(options) {
var idx = 0;
var streams = [];
function Divider(options) {
Transform.call(this, options);
}
Divider.prototype = Object.create(
Transform.prototype, { constructor: { value: Divider }});
Divider.prototype._transform = function(chunk, encoding, done) {
var length = chunk.length,
split = -1;
for (var i = 0; i < length; i++) {
if (chunk[i] === 10) { // '\n'
if ((i + 2) < length && chunk[i+1] === 10 && chunk[i+2] ==
'93') {
split = i;
break;
}
}
}
var rs;
if (!streams[idx]) {
rs = new Readable;
rs._read = function() {
if (chunk === null)
return rs.push('');
if (split == -1) {
rs.push(chunk);
} else {
rs.push(chunk.slice(0, split));
rs.push(null);
}
done();//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Throw Error Error:
no writecb in Transform class
};
this.emit('stream', rs, idx);
streams.push(rs);
} else {
rs = streams[idx];
}
rs.read(0);
if (split != -1) {
idx++;
this.unshift(chunk.slice(split + 2));
}
};
return new Divider(options);
}
//function for combine few streams in one
function combine(streams) {
var idx = 0;
var rs = new Readable();
rs._read = function(size) {
var chunk = streams[idx].read(size);
if (chunk === null)
return rs.push('');
return rs.push(chunk);
};
(function read() {
var stream = streams[idx];
stream.on('readable', function() {
rs.read(0);
});
stream.on('end', function() {
idx++;
if (idx == streams.length) {
rs.push("\n\n]");
rs.push(null);
return;
}
rs.push("\n\n]");
return read();
});
})();
return rs;
}
combine([fs.createReadStream('./files/img1.jpg'),
fs.createReadStream('./files/img2.jpg')])
.pipe(split()).on('stream', function(rs, index) {
rs.pipe(fs.createWriteStream('./files/after' + index));
});
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