'use strict';
export = srt;
import xml2js = require('xml2js');
import typings = require('../../typings');
/**
* Converts an input buffer to a SubRip subtitle.
*/
function srt(input: Buffer|string, done: (err: Error, subtitle?: string) => void) {
var options = {explicitArray: false, explicitRoot: false};
xml2js.parseString(input.toString(), options, (err: Error, xml: typings.ISubtitle) => {
try {
if (err) return done(err);
done(null, xml.events.event.map((event, index) => {
var attributes = event.$;
return (index + 1) + '\n' +
time(attributes.start) + ' --> ' + time(attributes.end) + '\n' +
text(attributes.text) + '\n';
}).join('\n'));
} catch (err) {
done(err);
}
});
}
/**
* Prefixes a value.
*/
function prefix(value: string, length: number): string {
while (value.length < length) value = '0' + value;
return value;
}
/**
* Suffixes a value.
*/
function suffix(value: string, length: number): string {
while (value.length < length) value = value + '0';
return value;
}
/**
* Formats a text value.
*/
function text(value: string): string {
return value
.replace(/{\\i1}/g, '').replace(/{\\i0}/g, '')
.replace(/{\\b1}/g, '').replace(/{\\b0}/g, '')
.replace(/{\\u1}/g, '').replace(/{\\u0}/g, '')
.replace(/{[^}]+}/g, '')
.replace(/(\s+)?\\n(\s+)?/ig, '\n')
.trim();
}
/**
* Formats a time stamp.
*/
function time(value: string): string {
var all = value.match(/^([0-9]+):([0-9]+):([0-9]+)\.([0-9]+)$/);
if (!all) throw new Error('Invalid time.');
var hours = prefix(all[1], 2);
var minutes = prefix(all[2], 2);
var seconds = prefix(all[3], 2);
var milliseconds = suffix(all[4], 3);
return hours + ':' + minutes + ':' + seconds + ',' + milliseconds;
}