Forward port of 51850 from release25-maint branch.
As mentioned on python-dev, reverting patch #1504333 because it introduced
an infinite loop in rev 47154.
This patch also adds a test to prevent the regression.
diff --git a/Lib/sgmllib.py b/Lib/sgmllib.py
index 3020d11..3ab57c2 100644
--- a/Lib/sgmllib.py
+++ b/Lib/sgmllib.py
@@ -29,12 +29,7 @@
shorttagopen = re.compile('<[a-zA-Z][-.a-zA-Z0-9]*/')
shorttag = re.compile('<([a-zA-Z][-.a-zA-Z0-9]*)/([^/]*)/')
piclose = re.compile('>')
-starttag = re.compile(r'<[a-zA-Z][-_.:a-zA-Z0-9]*\s*('
- r'\s*([a-zA-Z_][-:.a-zA-Z_0-9]*)(\s*=\s*'
- r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./,:;+*%?!&$\(\)_#=~@]'
- r'[][\-a-zA-Z0-9./,:;+*%?!&$\(\)_#=~\'"@]*(?=[\s>/<])))?'
- r')*\s*/?\s*(?=[<>])')
-endtag = re.compile(r'</?[a-zA-Z][-_.:a-zA-Z0-9]*\s*/?\s*(?=[<>])')
+endbracket = re.compile('[<>]')
tagfind = re.compile('[a-zA-Z][-_.a-zA-Z0-9]*')
attrfind = re.compile(
r'\s*([a-zA-Z_][-:.a-zA-Z_0-9]*)(\s*=\s*'
@@ -254,10 +249,14 @@
self.finish_shorttag(tag, data)
self.__starttag_text = rawdata[start_pos:match.end(1) + 1]
return k
- match = starttag.match(rawdata, i)
+ # XXX The following should skip matching quotes (' or ")
+ # As a shortcut way to exit, this isn't so bad, but shouldn't
+ # be used to locate the actual end of the start tag since the
+ # < or > characters may be embedded in an attribute value.
+ match = endbracket.search(rawdata, i+1)
if not match:
return -1
- j = match.end(0)
+ j = match.start(0)
# Now parse the data between i+1 and j into a tag and attrs
attrs = []
if rawdata[i:i+2] == '<>':
@@ -306,10 +305,10 @@
# Internal -- parse endtag
def parse_endtag(self, i):
rawdata = self.rawdata
- match = endtag.match(rawdata, i)
+ match = endbracket.search(rawdata, i+1)
if not match:
return -1
- j = match.end(0)
+ j = match.start(0)
tag = rawdata[i+2:j].strip().lower()
if rawdata[j] == '>':
j = j+1