public override EpsilonNfa Apply(CaptureExpression expression, Automaton param)
{
var nfa = new EpsilonNfa(param);
int captureIndex = 0;
if (expression.Name.Length != 0)
{
var names = param.CaptureNames;
captureIndex = names.IndexOf(expression.Name);
if (captureIndex == -1)
{
captureIndex = names.Count;
names.Add(expression.Name);
}
}
var body = Invoke(expression.Sub, param);
param.AddCapture(nfa.Start, body.Start, captureIndex);
param.AddTransition(body.End, nfa.End, Transition.Type.End);
return(nfa);
}
public static RegexNode GetCapture(string name, RegexNode node)
{
var expression = new CaptureExpression(name, node.Exp);
return(new RegexNode(expression));
}
public override Expression Apply(CaptureExpression expression, MergeParameter param)
{
return(new CaptureExpression(
expression.Name,
Invoke(expression.Sub, param)));
}
public bool Equals(CaptureExpression obj)
{
return
(Name == obj.Name &&
Sub.Equals(obj.Sub));
}
Expression ParseFunction()
{
if (_sourceWindow.AdvanceIfMatches("(="))
{
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new PositiveExpression(sub);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(!"))
{
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new NegativeExpression(sub);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(<&"))
{
//表达式引用
string name;
if (!_sourceWindow.AdvanceIfName(out name))
{
throw new ArgumentException("invalid name.");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost.");
}
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost.");
}
var exp = new ReferenceExpression(name);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(<$"))
{
string name;
int index = -1;
if (_sourceWindow.AdvanceIfName(out name))
{
if (_sourceWindow.AdvanceIfMatches(';'))
{
if (!_sourceWindow.AdvanceIfPositiveInteger(out index))
{
throw new ArgumentException("Positive numbers required after ;");
}
}
}
else if (!_sourceWindow.AdvanceIfPositiveInteger(out index))
{
throw new ArgumentException("Positive numbers required after (<$");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost.");
}
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost.");
}
var exp = new MatchExpression(name, index);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(<"))
{
string name;
if (!_sourceWindow.AdvanceIfName(out name))
{
throw new ArgumentException("Name lost");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost");
}
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new CaptureExpression(name, sub);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(?"))
{
var sub = ParseExpression();
if (_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new CaptureExpression(sub);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches('('))//subexpression
{
var exp = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
return(exp);
}
else
{
return(null);
}
}
public void Visit(CaptureExpression expression)
{
_returnValue = this.Apply(expression, _paramValue);
}
public abstract ReturnT Apply(CaptureExpression expression, ParamT param);
Expression ParseFunction()
{
if (_sourceWindow.AdvanceIfMatches("(="))
{
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new PositiveExpression(sub);
return exp;
}
else if (_sourceWindow.AdvanceIfMatches("(!"))
{
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new NegativeExpression(sub);
return exp;
}
else if (_sourceWindow.AdvanceIfMatches("(<&"))
{
//表达式引用
string name;
if (!_sourceWindow.AdvanceIfName(out name))
{
throw new ArgumentException("invalid name.");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost.");
}
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost.");
}
var exp = new ReferenceExpression(name);
return exp;
}
else if (_sourceWindow.AdvanceIfMatches("(<$"))
{
string name;
int index = -1;
if (_sourceWindow.AdvanceIfName(out name))
{
if (_sourceWindow.AdvanceIfMatches(';'))
{
if (!_sourceWindow.AdvanceIfPositiveInteger(out index))
{
throw new ArgumentException("Positive numbers required after ;");
}
}
}
else if (!_sourceWindow.AdvanceIfPositiveInteger(out index))
{
throw new ArgumentException("Positive numbers required after (<$");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost.");
}
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost.");
}
var exp = new MatchExpression(name, index);
return exp;
}
else if (_sourceWindow.AdvanceIfMatches("(<"))
{
string name;
if (!_sourceWindow.AdvanceIfName(out name))
{
throw new ArgumentException("Name lost");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost");
}
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new CaptureExpression(name, sub);
return exp;
}
else if (_sourceWindow.AdvanceIfMatches("(?"))
{
var sub = ParseExpression();
if (_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new CaptureExpression(sub);
return exp;
}
else if (_sourceWindow.AdvanceIfMatches('('))//subexpression
{
var exp = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
return exp;
}
else return null;
}
public static RegexNode GetCapture(string name,RegexNode node)
{
var expression = new CaptureExpression(name, node.Exp);
return new RegexNode(expression);
}
public bool Equals(CaptureExpression obj)
{
return
Name == obj.Name &&
Sub.Equals(obj.Sub);
}