According to Benjamin Smedberg:
> Having seen the argument about comment parsing both here and on the regular
> list, I think that there is a solution that will please everybody:
>
> Once you've started a comment, check each dash: if it is followed by only
> dashes, whitespace, up to the next right bracket, then end the comment.
> Otherwise, keep going.
>
> This follows the standard and allows for quite a bit of non-standard) coding
> as well.
Yes, this is more or less what we had come to agree upon. I've finally
taken the time to implement it. Here is the new code, first as a snippet,
so you can see what it does, and as a patch to the 3.1.1 source, so you
can give it a try. I'd appreciate it if everyone who participated in this
discussion, or who had problems with parsing comments in the past, to give
this a try. It past the few test cases I threw at it, but I'd like people
to hammer away at it for a while.
if (strncmp((char *)position, "<!", 2) == 0)
{
//
// Possible comment declaration (but could be DTD declaration!)
// A comment can contain other '<' and '>':
// we have to ignore complete comment declarations
// but of course also DTD declarations.
//
position += 2; // Get past declaration start
if (strncmp((char *)position, "--", 2) == 0)
{
// Found start of comment - now find the end
position += 2;
do
{
q = (unsigned char*)strstr((char *)position, "--");
if (!q)
{
*position = '\0';
break; // Rest of document seems to be a comment...
}
else
{
position = q + 2;
// Skip dashes after a badly formed comment
while (*position == '-')
position++;
// Skip whitespace after an individual comment
while (isspace(*position))
position++;
}
// if comment declaration hasn't ended, skip another comment
}
while (*position && *position != '>');
if (*position == '>')
{
position++; // End of comment declaration
}
}
else
{
// Not a comment declaration after all
// but possibly DTD: get to the end
q = (unsigned char*)strstr((char *)position, ">");
if (q)
{
position = q + 1;
// End of (whatever) declaration
}
else
{
*position = '\0'; // Rest of document is DTD?
}
}
continue;
}
Apply this patch to htdig/HTML.cc from ht://Dig 3.1.1 (or later).
--- htdig/HTML.cc.commentbug Wed Feb 24 12:36:59 1999
+++ htdig/HTML.cc Wed Mar 17 11:01:08 1999
@@ -140,54 +140,54 @@ HTML::parse(Retriever &retriever, URL &b
//
// Possible comment declaration (but could be DTD declaration!)
// A comment can contain other '<' and '>':
- // we have to ignore a complete comment declarations
+ // we have to ignore complete comment declarations
// but of course also DTD declarations.
//
position += 2; // Get past declaration start
- while (*position)
+ if (strncmp((char *)position, "--", 2) == 0)
{
- // Let's see if the declaration ends here
- if (*position == '>')
- {
- position++;
- break; // End of comment declaration
- }
- // Not the end of the declaration yet:
- // we'll try to find an actual comment
- if (strncmp((char *)position, "--", 2) == 0)
+ // Found start of comment - now find the end
+ position += 2;
+ do
{
- // Found start of comment - now find the end
- position += 2;
q = (unsigned char*)strstr((char *)position, "--");
if (!q)
{
*position = '\0';
break; // Rest of document seems to be a comment...
}
- position = q + 2;
- }
- else
- {
- // Not a comment declaration after all
- // but possibly DTD: get to the end
- q = (unsigned char*)strstr((char *)position, ">");
- if (q)
- {
- position = q + 1;
- break;
- // End of (whatever) declaration
- }
else
{
- *position = '\0'; // Rest of document is DTD?
- break;
+ position = q + 2;
+ // Skip extra dashes after a badly formed comment
+ while (*position == '-')
+ position++;
+ // Skip whitespace after an individual comment
+ while (isspace(*position))
+ position++;
}
-
+ // if comment declaration hasn't ended, skip another comment
+ }
+ while (*position && *position != '>');
+ if (*position == '>')
+ {
+ position++; // End of comment declaration
+ }
+ }
+ else
+ {
+ // Not a comment declaration after all
+ // but possibly DTD: get to the end
+ q = (unsigned char*)strstr((char *)position, ">");
+ if (q)
+ {
+ position = q + 1;
+ // End of (whatever) declaration
+ }
+ else
+ {
+ *position = '\0'; // Rest of document is DTD?
}
-
- // Skip whitespace after an individual comment
- while (isspace(*position))
- position++;
}
continue;
}
--
Gilles R. Detillieux E-mail: <[EMAIL PROTECTED]>
Spinal Cord Research Centre WWW: http://www.scrc.umanitoba.ca/~grdetil
Dept. Physiology, U. of Manitoba Phone: (204)789-3766
Winnipeg, MB R3E 3J7 (Canada) Fax: (204)789-3930
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