1+ const readFile = ( file ) => {
2+ return new Promise ( ( resolve , reject ) => {
3+ let fr = new FileReader ( ) ;
4+ fr . onload = x => resolve ( fr . result ) ;
5+ fr . readAsText ( file ) ;
6+ } ) ;
7+ }
8+
9+ const read = async ( input ) => {
10+ try {
11+ console . log ( 'reading file contents' ) ;
12+ const textContent = await readFile ( input . files [ 0 ] ) ;
13+ console . log ( 'done reading' ) ;
14+ const parsedSegments = await parseTimedText ( textContent ) ;
15+ // const srtData = convertSegmentsToSrt(parsedSegments);
16+ } catch ( err ) {
17+ console . log ( 'error occured' ) ;
18+ console . log ( err ) ;
19+ dispayResult ( {
20+ isInvalid : true ,
21+ content : 'Error while reading the file! Please try again'
22+ } ) ;
23+ }
24+ }
25+
26+
27+ /**
28+ * Parses stringified JSON content for getting text & time details
29+ * @param {string } txt
30+ * @returns {Array<Segment> } segments
31+ */
32+ const parseTimedText = async ( txt ) => {
33+ const timedTextJson = JSON . parse ( txt ) ;
34+ const events = timedTextJson . events || [ ] ;
35+ return await getSegments ( events ) ;
36+ }
37+
38+ /**
39+ * Parses events array and returns Array of Segments containing:
40+ * (startTime, endTime, and caption text)
41+ * @param {Array<EventObject> } events
42+ * EventObject : {
43+ "tStartMs": Number,
44+ "dDurationMs": Number,
45+ "id"?: Number,
46+ "wpWinPosId"?: Number,
47+ "wsWinStyleId"?: Number,
48+ "wWinId"?: Number,
49+ "segs"?: Array<{utf8: String}>,
50+ "aAppend"?: Number
51+ }
52+ * @returns {Array<Segment> } segments
53+ * Segment: {
54+ "startTimeMs": Number,
55+ "endTimeMs": Number,
56+ "text": String
57+ }
58+ *
59+ */
60+ const getSegments = async ( events ) => {
61+
62+ const segments = [ ] ;
63+ let segmentText = '' ;
64+ let segment = {
65+ startTimeMs : 0 ,
66+ } ;
67+
68+ events . map ( evt => {
69+
70+ if ( ! evt . aAppend ) {
71+ segment . startTimeMs = evt . tStartMs ;
72+ ( evt . segs || [ ] ) . map ( seg => {
73+ const text = seg . utf8 ; //.trim();
74+ if ( text && text !== '\n' ) {
75+ segmentText += ( text || '' ) ;
76+ }
77+ } ) ;
78+
79+ } else {
80+ segment . endTimeMs = evt . tStartMs ;
81+ segment . text = segmentText ;
82+ segments . push ( segment ) ;
83+ segment = { } ;
84+ segmentText = '' ;
85+ }
86+
87+ } ) ;
88+
89+ return segments ;
90+
91+ }
92+
93+
94+ const convertToStrTime = ( ms ) => {
95+
96+ let seconds = Math . floor ( ms / 1000 ) ;
97+
98+ ms = ms % 1000 ;
99+ const milliseconds = ms ;
100+
101+ let minutes = Math . floor ( seconds / 60 ) ;
102+ seconds = seconds % 60 ;
103+
104+ const hours = Math . floor ( minutes / 60 ) ;
105+ minutes = minutes % 60 ;
106+
107+ return paddZero ( [ hours , minutes , seconds , milliseconds ] ) . join ( ':' ) ;
108+
109+ }
110+
111+ const paddZero = ( numList ) => {
112+
113+ if ( ! Array . isArray ( numList ) ) return [ ] ;
114+
115+ return numList . map ( num => {
116+ if ( + num >= 10 ) return `${ num } ;
117+ return `0${ num } ;
118+ } ) ;
119+
120+ }
121+
122+ const dispayResult = ( result ) => {
123+ if ( ! result . isInvalid ) {
124+
125+ } else {
126+ msg . innerText = result . content ;
127+ }
128+ }
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