/// <summary>
/// Constructs new <see cref="RegExp"/> from a string.
/// </summary>
/// <param name="s"> Regexp string. </param>
/// <param name="syntax_flags"> Boolean 'or' of optional <see cref="RegExpSyntax"/> constructs to be
/// enabled. </param>
/// <exception cref="ArgumentException"> If an error occured while parsing the
/// regular expression </exception>
public RegExp(string s, RegExpSyntax syntax_flags)
{
b = s;
flags = syntax_flags;
RegExp e;
if (s.Length == 0)
{
e = MakeString("");
}
else
{
e = ParseUnionExp();
if (pos < b.Length)
{
throw new ArgumentException("end-of-string expected at position " + pos);
}
}
kind = e.kind;
exp1 = e.exp1;
exp2 = e.exp2;
this.s = e.s;
c = e.c;
min = e.min;
max = e.max;
digits = e.digits;
from = e.from;
to = e.to;
b = null;
}
internal DumbRegexpQuery(Term term, RegExpSyntax flags)
: base(term.Field)
{
RegExp re = new RegExp(term.Text, flags);
automaton = re.ToAutomaton();
}
/// <summary>
/// Constructs a query for terms matching <paramref name="term"/>.
/// </summary>
/// <param name="term"> Regular expression. </param>
/// <param name="flags"> Optional <see cref="RegExp"/> features from <see cref="RegExpSyntax"/> </param>
/// <param name="provider"> Custom <see cref="IAutomatonProvider"/> for named automata </param>
public RegexpQuery(Term term, RegExpSyntax flags, IAutomatonProvider provider)
: base(term, (new RegExp(term.Text(), flags)).ToAutomaton(provider))
{
}
/// <summary>
/// Constructs a query for terms matching <paramref name="term"/>.
/// </summary>
/// <param name="term"> Regular expression. </param>
/// <param name="flags"> Optional <see cref="RegExp"/> features from <see cref="RegExpSyntax"/> </param>
public RegexpQuery(Term term, RegExpSyntax flags)
: this(term, flags, defaultProvider)
{
}
private bool Check(RegExpSyntax flag)
{
return((flags & flag) != 0);
}
