[ python-Bugs-849097 ] Request: getpos() for sgmllib

Tue Nov 25 11:47:35 EST 2003

Bugs item #849097, was opened at 2003-11-25 17:47
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You can respond by visiting: 
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Dan Wiklund (d98dzone)
Assigned to: Nobody/Anonymous (nobody)
Summary: Request: getpos() for sgmllib

Initial Comment:
During the process of making my masters thesis I
discovered the need for a working getpos() in
sgmllib.py. As it is now you can successfully call it
since it is inherited from markupbase.py but you will
always get the answer (1,0) since it is never updated.

To fix this one needs to change the goahead function.
This is my own implementation of this change, in part
influenced by the "sister" goahead-function  in
HTLMParser.py:

************************************
def goahead(self, end):
        rawdata = self.rawdata
        i = 0
        k = 0
        n = len(rawdata)
        tmp=0
        while i < n:
            if self.nomoretags:
                self.handle_data(rawdata[i:n])
                i = n
                break
            match = interesting.search(rawdata, i)
            if match: j = match.start()
            else: j = n
            if i < j:
                self.handle_data(rawdata[i:j])
                tmp = self.updatepos(i, j)
            i = j
            if i == n: break
            startswith = rawdata.startswith
            if rawdata[i] == '<':
                if starttagopen.match(rawdata, i):
                    if self.literal:
                        self.handle_data(rawdata[i])
                        tmp = self.updatepos(i, i+1)
                        i = i+1
                        continue
                    k = self.parse_starttag(i)
                    if k < 0: break
                    tmp = self.updatepos(i, k)
                    i = k
                    continue
                if rawdata.startswith("</", i):
                    k = self.parse_endtag(i)
                    if k < 0: break
                    tmp = self.updatepos(i, k)
                    i = k
                    self.literal = 0
                    continue
                if self.literal:
                    if n > (i + 1):
                        self.handle_data("<")
                        i = i+1
                        tmp = self.updatepos(i, k)
                    else:
                        # incomplete
                        break
                    continue
                if rawdata.startswith("<!--", i):
                        # Strictly speaking, a comment
is --.*--
                        # within a declaration tag <!...>.
                        # This should be removed,
                        # and comments handled only in
parse_declaration.
                    k = self.parse_comment(i)

                    if k < 0: break
                    tmp = self.updatepos(i, k)
                    i = k

                    continue
                if rawdata.startswith("<?", i):
                    k = self.parse_pi(i)
                    if k < 0: break
                    tmp = self.updatepos(i, k)
                    i = i+k
                    continue
                if rawdata.startswith("<!", i):
                    # This is some sort of declaration;
in "HTML as
                    # deployed," this should only be
the document type
                    # declaration ("<!DOCTYPE html...>").
                    k = self.parse_declaration(i)
                    if k < 0: break
                    tmp = self.updatepos(i, k)
                    i = k
                    continue
                tmp = self.updatepos(i, k)
            elif rawdata[i] == '&':

                if self.literal:
                    self.handle_data(rawdata[i])
                    #tmp = self.updatepos(i,i+1)#added
                    i = i+1
                    continue
                match = charref.match(rawdata, i)
                if match:
                    name = match.group()[2:-1]
                    self.handle_charref(name)
                    k = match.end()
                    if not startswith(';', k-1):
                        k = k - 1
                    tmp = self.updatepos(i, k)
                    i = k
                    continue
                match = entityref.match(rawdata, i)
                if match:
                    name = match.group(1)
                    self.handle_entityref(name)
                    k = match.end()
                    if not startswith(';', k-1):
                        k = k - 1
                    tmp = self.updatepos(i, k)
                    i = k
                    continue

            else:
                self.error('neither < nor & ??')
            # We get here only if incomplete matches but
            # nothing else
            match = incomplete.match(rawdata, i)
            if not match:
                self.handle_data(rawdata[i])
                i = i+1
                continue
            j = match.end(0)
            if j == n:
                break # Really incomplete
            self.handle_data(rawdata[i:j])

            i = j

        # end while
        if end and i < n:
            self.handle_data(rawdata[i:n])
            tmp = self.updatepos(i, n)
            i = n
        self.rawdata = rawdata[i:]
        # XXX if end: check for empty stack

    # Extensions for the DOCTYPE scanner:
    _decl_otherchars = '='

****************************

The major diffrence is the updatepos functions. It
seems to work fine, or at least it has worked fine for
me so far.

----------------------------------------------------------------------

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