public bool filter(Regsub rs, System.Text.StringBuilder sb)
{
sunlabs.brazil.util.regexp.Regexp.applySubspec(rs, subspec, sb);
return all;
}
/// <summary> Utility method to give access to the standard substitution algorithm
/// used by <code>sub</code> and <code>subAll</code>. Appends to the
/// string buffer the string generated by applying the substitution
/// parameter to the matched region.
///
/// </summary>
/// <param name="">rs
/// Information about the matched region.
///
/// </param>
/// <param name="">subspec
/// The substitution parameter.
///
/// </param>
/// <param name="">sb
/// StringBuffer to which the generated string is appended.
/// </param>
public static void applySubspec(Regsub rs, string subspec, System.Text.StringBuilder sb)
{
try
{
int len = subspec.Length;
for (int i = 0; i < len; i++)
{
char ch = subspec[i];
switch (ch)
{
case '&': {
sb.Append(rs.matched());
break;
}
case '\\': {
i++;
ch = subspec[i];
if ((ch >= '0') && (ch <= '9'))
{
string match = rs.submatch(ch - '0');
if ((System.Object) match != null)
{
sb.Append(match);
}
break;
}
// fall through.
}
goto default;
default: {
sb.Append(ch);
}
break;
}
}
}
catch (System.IndexOutOfRangeException e)
{
/*
* Ignore malformed substitution pattern.
* Return string matched so far.
*/
}
}
public string sub(string str, Filter rf)
{
Regsub rs = new Regsub(this, str);
if (rs.nextMatch() == false)
{
return str;
}
System.Text.StringBuilder sb = new System.Text.StringBuilder();
do
{
sb.Append(rs.skipped());
if (rf.filter(rs, sb) == false)
{
break;
}
}
while (rs.nextMatch());
sb.Append(rs.rest());
return sb.ToString();
}
/// <summary> Matches a string against a regular expression and replaces the first
/// match with the string generated from the substitution parameter.
///
/// </summary>
/// <param name="">str
/// The string to match against this regular expression.
///
/// </param>
/// <param name="">subspec
/// The substitution parameter, described in <a href=#regsub>
/// REGULAR EXPRESSION SUBSTITUTION</a>.
///
/// </param>
/// <returns> The string formed by replacing the first match in
/// <code>str</code> with the string generated from
/// <code>subspec</code>. If no matches were found, then
/// the return value is <code>null</code>.
/// </returns>
public string sub(string str, string subspec)
{
Regsub rs = new Regsub(this, str);
if (rs.nextMatch())
{
System.Text.StringBuilder sb = new System.Text.StringBuilder(rs.skipped());
applySubspec(rs, subspec, sb);
sb.Append(rs.rest());
return sb.ToString();
}
else
{
return null;
}
}
