private RegExp ParseUnionExp()
{
RegExp e = this.ParseInterExp();
if (this.Match('|'))
{
e = RegExp.MakeUnion(e, this.ParseUnionExp());
}
return(e);
}
private RegExp ParseCharClasses()
{
RegExp e = this.ParseCharClass();
while (this.More() && !this.Peek("]"))
{
e = RegExp.MakeUnion(e, this.ParseCharClass());
}
return(e);
}
private RegExp ParseCharClass()
{
char @char = this.ParseCharExp();
if (this.Match('-'))
{
if (this.Peek("]"))
{
return(RegExp.MakeUnion(RegExp.MakeChar(@char), RegExp.MakeChar('-')));
}
return(RegExp.MakeCharRange(@char, this.ParseCharExp()));
}
return(RegExp.MakeChar(@char));
}