On Tue, 06 Jun 2006 14:57:06 -0700, Chris Hostetter wrote:
> I took an approach similar to that, by escaping all of the "special'
> characters except '+', '-', and '"', and then stripping out all quotes if
> there was a non even amount ... this gave me a simplified version of the
> Lucene syntax that was fairly safe.
Actually that is exactly what I wanted (allow '+', '-', and '"' only).
I've attached the code I am using. I'd appreciate it if anyone can find
remaining problems. The escape method should take any string and the
result should be passable to QueryParser without causing a ParseException.
The logic is:
- Lowercase string to remove support for AND and OR (AFAICT they are not
otherwise escapable)
- Use QueryParser.escape to escape all special characters
- Use a regex to "unescape" only +, -, and '"'
- Count the number of quotes. If it is odd, add a space and a closing
quote to the end of the query.
It would be nice if QueryParser had methods which would let you choose
which of its features you wanted to enable. I understand that due to the
nature of JavaCC that might be hard to do, though.
Thanks,
Chris
private static final Pattern unescape =
Pattern.compile("\\\\([+\\-\"])");
private static String escape(String s) {
s = s.toLowerCase();
s = QueryParser.escape(s);
s = unescape.matcher(s).replaceAll("$1");
if ((count(s, '"') & 1) != 0)
s += " \"";
return s;
}
private static int count(String s, char c) {
int count = 0;
for (int i = 0; i < s.length(); i++)
if (s.charAt(i) == c)
count++;
return count;
}
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