public override string Generate(Random random)
{
if (this == RegexCompiler.InvalidNode)
{
//select a character
int pos = random.Next(mNodeText.Length);
//generate any other character using a negative SetNode
RegexSetNode others = new RegexSetNode(false);
others.AddChars(mNodeText[pos].ToString());
//replace the character
char backup = mNodeText[pos];
mNodeText[pos] = others.Generate(random)[0];
string result = mNodeText.ToString();
//if this node is repeated it needs to be cleaned up for the next call
mNodeText[pos] = backup;
return(result);
}
else
{
return(mNodeText.ToString());
}
}
//Compile \d \D \s \S etc.
public RegexNode CompileSimpleMacro(char c)
{
RegexNode node = null;
RegexSetNode set = null;
if (@"[]{}()*-+.?\|".Contains(c.ToString()))
{
return(new RegexTextNode(c.ToString()));
}
switch (c)
{
case 'd': // [0-9]
node = set = new RegexSetNode(true);
set.AddRange('0', '9');
break;
case 'D': // [^0-9]
node = set = new RegexSetNode(false);
set.AddRange('0', '9');
break;
case 's':
node = set = new RegexSetNode(true);
set.AddChars(" \r\n\f\v\t");
break;
case 'S':
node = set = new RegexSetNode(false);
set.AddChars(" \r\n\f\v\t");
break;
case 'w': // [a-zA-Z0-9_]
node = set = new RegexSetNode(true);
set.AddRange('a', 'z');
set.AddRange('A', 'Z');
set.AddRange('0', '9');
set.AddChars("_");
break;
case 'W': // [^a-zA-Z0-9_]
node = set = new RegexSetNode(false);
set.AddRange('a', 'z');
set.AddRange('A', 'Z');
set.AddRange('0', '9');
set.AddChars("_");
break;
case 'f':
node = new RegexTextNode("\f");
break;
case 'n':
node = new RegexTextNode("\n");
break;
case 'r':
node = new RegexTextNode("\r");
break;
case 't':
node = new RegexTextNode("\t");
break;
case 'v':
node = new RegexTextNode("\v");
break;
case 'A':
case 'Z':
case 'z':
node = new RegexTextNode(String.Empty);
break;
default:
AssertParse(false, "Invalid escape.");
break;
}
return(node);
}