removed dependency from lxml: added IDParser

youtube_dl/__init__.py

@@ -67,11 +67,6 @@ try:
 except ImportError:
 	from cgi import parse_qs
 
-try:
-	import lxml.etree
-except ImportError:
-	pass # Handled below
-
 try:
 	import xml.etree.ElementTree
 except ImportError: # Python<2.5: Not officially supported, but let it slip
@@ -198,6 +193,69 @@ except ImportError: # Python <2.6, use trivialjson (https://github.com/phihag/tr
 				raise ValueError('Extra data at end of input (index ' + str(i) + ' of ' + repr(s) + ': ' + repr(s[i:]) + ')')
 			return res
 
+
+class IDParser(HTMLParser.HTMLParser):
+	"""Modified HTMLParser that isolates a tag with the specified id"""
+	def __init__(self, id):
+		self.id = id
+		self.result = None
+		self.started = False
+		self.depth = {}
+		self.html = None
+		self.watch_startpos = False
+		HTMLParser.HTMLParser.__init__(self)
+
+	def loads(self, html):
+		self.html = html
+		self.feed(html)
+		self.close()
+
+	def handle_starttag(self, tag, attrs):
+		attrs = dict(attrs)
+		if self.started:
+			self.find_startpos(None)
+		if 'id' in attrs and attrs['id'] == self.id:
+			self.result = [tag]
+			self.started = True
+			self.watch_startpos = True
+		if self.started:
+			if not tag in self.depth: self.depth[tag] = 0
+			self.depth[tag] += 1
+
+	def handle_endtag(self, tag):
+		if self.started:
+			if tag in self.depth: self.depth[tag] -= 1
+			if self.depth[self.result[0]] == 0:
+				self.started = False
+				self.result.append(self.getpos())
+
+	def find_startpos(self, x):
+		"""Needed to put the start position of the result (self.result[1])
+		after the opening tag with the requested id"""
+		if self.watch_startpos:
+			self.watch_startpos = False
+			self.result.append(self.getpos())
+	handle_entityref = handle_charref = handle_data = handle_comment = \
+	handle_decl = handle_pi = unknown_decl = find_startpos
+
+	def get_result(self):
+		if self.result == None: return None
+		if len(self.result) != 3: return None
+		lines = self.html.split('\n')
+		lines = lines[self.result[1][0]-1:self.result[2][0]]
+		lines[0] = lines[0][self.result[1][1]:]
+		if len(lines) == 1:
+			lines[-1] = lines[-1][:self.result[2][1]-self.result[1][1]]
+		lines[-1] = lines[-1][:self.result[2][1]]
+		return '\n'.join(lines).strip()
+
+def get_element_by_id(id, html):
+	"""Return the content of the tag with the specified id in the passed HTML document"""
+	parser = IDParser(id)
+	parser.loads(html)
+	return parser.get_result()
+
+
 def preferredencoding():
 	"""Get preferred encoding.
 
@@ -246,7 +304,7 @@ def clean_html(html):
 	"""Clean an HTML snippet into a readable string"""
 	# Newline vs <br />
 	html = html.replace('\n', ' ')
-	html = re.sub('<\s*br\s*/?\s*>', '\n', html)
+	html = re.sub('\s*<\s*br\s*/?\s*>\s*', '\n', html)
 	# Strip html tags
 	html = re.sub('<.*?>', '', html)
 	# Replace html entities
@@ -1432,18 +1490,9 @@ class YoutubeIE(InfoExtractor):
 					pass
 
 		# description
-		try:
-			lxml.etree
-		except NameError:
-			video_description = u'No description available.'
-			mobj = re.search(r'<meta name="description" content="(.*?)">', video_webpage)
-			if mobj is not None:
-				video_description = mobj.group(1).decode('utf-8')
-		else:
-			html_parser = lxml.etree.HTMLParser(encoding='utf-8')
-			vwebpage_doc = lxml.etree.parse(StringIO.StringIO(video_webpage), html_parser)
-			video_description = u''.join(vwebpage_doc.xpath('id("eow-description")//text()'))
-			# TODO use another parser
+		video_description = get_element_by_id("eow-description", video_webpage)
+		if video_description: video_description = clean_html(video_description.decode('utf8'))
+		else: video_description = ''
 			
 		# closed captions
 		video_subtitles = None
@@ -2177,18 +2226,9 @@ class VimeoIE(InfoExtractor):
 		video_thumbnail = config["video"]["thumbnail"]
 
 		# Extract video description
-		try:
-			lxml.etree
-		except NameError:
-			video_description = u'No description available.'
-			mobj = re.search(r'<meta name="description" content="(.*?)" />', webpage, re.MULTILINE)
-			if mobj is not None:
-				video_description = mobj.group(1)
-		else:
-			html_parser = lxml.etree.HTMLParser()
-			vwebpage_doc = lxml.etree.parse(StringIO.StringIO(webpage), html_parser)
-			video_description = u''.join(vwebpage_doc.xpath('id("description")//text()')).strip()
-			# TODO use another parser
+		video_description = get_element_by_id("description", webpage)
+		if video_description: video_description = clean_html(video_description.decode('utf8'))
+		else: video_description = ''
 
 		# Extract upload date
 		video_upload_date = u'NA'