rewrite SubtitleParser, #180
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@ -6,7 +6,6 @@ functionality:
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import json
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import os
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import re
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from datetime import datetime
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import requests
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@ -65,7 +64,7 @@ class YoutubeSubtitle:
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if not all_formats:
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return False
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subtitle = [i for i in all_formats if i["ext"] == "vtt"][0]
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subtitle = [i for i in all_formats if i["ext"] == "json3"][0]
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subtitle.update(
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{"lang": lang, "source": "auto", "media_url": media_url}
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)
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@ -102,7 +101,7 @@ class YoutubeSubtitle:
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# no user subtitles found
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return False
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subtitle = [i for i in all_formats if i["ext"] == "vtt"][0]
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subtitle = [i for i in all_formats if i["ext"] == "json3"][0]
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subtitle.update(
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{"lang": lang, "source": "user", "media_url": media_url}
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)
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@ -145,109 +144,65 @@ class YoutubeSubtitle:
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class SubtitleParser:
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"""parse subtitle str from youtube"""
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time_reg = r"^([0-9]{2}:?){3}\.[0-9]{3} --> ([0-9]{2}:?){3}\.[0-9]{3}"
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stamp_reg = r"<([0-9]{2}:?){3}\.[0-9]{3}>"
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tag_reg = r"</?c>"
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def __init__(self, subtitle_str, lang):
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self.subtitle_str = subtitle_str
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self.subtitle_raw = json.loads(subtitle_str)
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self.lang = lang
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self.header = False
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self.parsed_cue_list = False
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self.all_text_lines = False
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self.matched = False
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self.all_cues = False
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def process(self):
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"""collection to process subtitle string"""
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self._parse_cues()
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self._match_text_lines()
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self._add_id()
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self._timestamp_check()
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"""extract relevant que data"""
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self.all_cues = []
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for idx, event in enumerate(self.subtitle_raw.get("events")):
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cue = {
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"start": self.ms_conv(event["tStartMs"]),
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"end": self.ms_conv(event["tStartMs"] + event["dDurationMs"]),
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"text": "".join([i.get("utf8") for i in event["segs"]]),
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"idx": idx + 1,
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}
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self.all_cues.append(cue)
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def _parse_cues(self):
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"""split into cues"""
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all_cues = self.subtitle_str.replace("\n \n", "\n").split("\n\n")
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self.header = all_cues[0]
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self.all_text_lines = []
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self.parsed_cue_list = [self._cue_cleaner(i) for i in all_cues[1:]]
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@staticmethod
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def ms_conv(ms):
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"""convert ms to timestamp"""
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hours = str((ms // (1000 * 60 * 60)) % 24).zfill(2)
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minutes = str((ms // (1000 * 60)) % 60).zfill(2)
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secs = str((ms // 1000) % 60).zfill(2)
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millis = str(ms % 1000).zfill(3)
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def _cue_cleaner(self, cue):
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"""parse single cue"""
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all_lines = cue.split("\n")
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cue_dict = {"lines": []}
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for line in all_lines:
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if re.match(self.time_reg, line):
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clean = re.search(self.time_reg, line).group()
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start, end = clean.split(" --> ")
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cue_dict.update({"start": start, "end": end})
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else:
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clean = re.sub(self.stamp_reg, "", line)
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clean = re.sub(self.tag_reg, "", clean)
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cue_dict["lines"].append(clean)
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if clean.strip() and clean not in self.all_text_lines[-4:]:
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# remove immediate duplicates
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self.all_text_lines.append(clean)
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return cue_dict
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def _match_text_lines(self):
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"""match unique text lines with timestamps"""
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self.matched = []
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while self.all_text_lines:
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check = self.all_text_lines[0]
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matches = [i for i in self.parsed_cue_list if check in i["lines"]]
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new_cue = matches[-1]
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new_cue["start"] = matches[0]["start"]
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for line in new_cue["lines"]:
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try:
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self.all_text_lines.remove(line)
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except ValueError:
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continue
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self.matched.append(new_cue)
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def _timestamp_check(self):
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"""check if end timestamp is bigger than start timestamp"""
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for idx, cue in enumerate(self.matched):
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# this
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end = int(re.sub("[^0-9]", "", cue.get("end")))
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# next
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try:
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next_cue = self.matched[idx + 1]
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except IndexError:
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continue
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start_next = int(re.sub("[^0-9]", "", next_cue.get("start")))
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if end > start_next:
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self.matched[idx]["end"] = next_cue.get("start")
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def _add_id(self):
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"""add id to matched cues"""
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for idx, _ in enumerate(self.matched):
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self.matched[idx]["id"] = idx + 1
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return f"{hours}:{minutes}:{secs}.{millis}"
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def get_subtitle_str(self):
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"""stitch cues and return processed new string"""
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new_subtitle_str = self.header + "\n\n"
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"""create vtt text str from cues"""
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subtitle_str = f"WEBVTT\nKind: captions\nLanguage: {self.lang}"
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for cue in self.matched:
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timestamp = f"{cue.get('start')} --> {cue.get('end')}"
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lines = "\n".join(cue.get("lines"))
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cue_text = f"{cue.get('id')}\n{timestamp}\n{lines}\n\n"
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new_subtitle_str = new_subtitle_str + cue_text
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for cue in self.all_cues:
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stamp = f"{cue.get('start')} --> {cue.get('end')}"
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cue_text = f"\n\n{cue.get('idx')}\n{stamp}\n{cue.get('text')}"
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subtitle_str = subtitle_str + cue_text
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return new_subtitle_str
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return subtitle_str
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def create_bulk_import(self, video, source):
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"""process matched for es import"""
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"""subtitle lines for es import"""
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documents = self.create_documents(video, source)
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bulk_list = []
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channel = video.json_data.get("channel")
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document = {
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for document in documents:
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document_id = document.get("subtitle_fragment_id")
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action = {"index": {"_index": "ta_subtitle", "_id": document_id}}
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bulk_list.append(json.dumps(action))
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bulk_list.append(json.dumps(document))
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bulk_list.append("\n")
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query_str = "\n".join(bulk_list)
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return query_str
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def create_documents(self, video, source):
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"""process documents"""
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documents = self.chunk_list(video.youtube_id)
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channel = video.json_data.get("channel")
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meta_dict = {
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"youtube_id": video.youtube_id,
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"title": video.json_data.get("title"),
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"subtitle_channel": channel.get("channel_name"),
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@ -257,26 +212,35 @@ class SubtitleParser:
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"subtitle_source": source,
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}
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for match in self.matched:
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match_id = match.get("id")
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document_id = f"{video.youtube_id}-{self.lang}-{match_id}"
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action = {"index": {"_index": "ta_subtitle", "_id": document_id}}
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document.update(
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{
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"subtitle_fragment_id": document_id,
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"subtitle_start": match.get("start"),
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"subtitle_end": match.get("end"),
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"subtitle_index": match_id,
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"subtitle_line": " ".join(match.get("lines")),
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_ = [i.update(meta_dict) for i in documents]
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return documents
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def chunk_list(self, youtube_id):
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"""join cues for bulk import"""
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chunk_list = []
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chunk = {}
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for cue in self.all_cues:
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if chunk:
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text = f"{chunk.get('subtitle_line')} {cue.get('text')}\n"
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chunk["subtitle_line"] = text
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else:
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idx = len(chunk_list) + 1
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chunk = {
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"subtitle_index": idx,
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"subtitle_line": cue.get("text"),
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"subtitle_start": cue.get("start"),
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}
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)
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bulk_list.append(json.dumps(action))
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bulk_list.append(json.dumps(document))
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bulk_list.append("\n")
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query_str = "\n".join(bulk_list)
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chunk["subtitle_fragment_id"] = f"{youtube_id}-{self.lang}-{idx}"
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return query_str
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if cue["idx"] % 5 == 0:
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chunk["subtitle_end"] = cue.get("end")
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chunk_list.append(chunk)
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chunk = {}
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return chunk_list
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class YoutubeVideo(YouTubeItem, YoutubeSubtitle):
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