public override Expression Apply(ReferenceExpression expression, MergeParameter keysHasCollected)
{
if (keysHasCollected.Definitions.ContainsKey(expression.Name))
{
var ret = keysHasCollected.Definitions[expression.Name];
if (ret != null)
{
return(ret);
}
else
{
throw new ArgumentException("loop reference");
}
}
else if (keysHasCollected.Main.Definitions.ContainsKey(expression.Name))
{
keysHasCollected.Definitions.Add(expression.Name, null);
var ret = Invoke(keysHasCollected.Main.Definitions[expression.Name], keysHasCollected);
keysHasCollected.Definitions[expression.Name] = ret;
return(ret);
}
else
{
throw new ArgumentException($"Cannot find the referenced expression {expression.Name}.");
}
}
public override EpsilonNfa Apply(ReferenceExpression expression, Automaton param)
{
throw new NotImplementedException();
}
public static RegexNode GetReference(string name)
{
var expression = new ReferenceExpression(name);
return(new RegexNode(expression));
}
Expression ParseFunction()
{
if (_sourceWindow.AdvanceIfMatches("(="))
{
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new PositiveExpression(sub);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(!"))
{
var sub = ParseExpression();
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost");
}
var exp = new NegativeExpression(sub);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(<&"))
{
//表达式引用
string name;
if (!_sourceWindow.AdvanceIfName(out name))
{
throw new ArgumentException("invalid name.");
}
if (!_sourceWindow.AdvanceIfMatches('>'))
{
throw new ArgumentException("> lost.");
}
if (!_sourceWindow.AdvanceIfMatches(')'))
{
throw new ArgumentException(") lost.");
}
var exp = new ReferenceExpression(name);
return(exp);
}
else if (_sourceWindow.AdvanceIfMatches("(<$"))
{
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(ReferenceExpression expression)
{
_returnValue = this.Apply(expression, _paramValue);
}
public abstract ReturnT Apply(ReferenceExpression 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 GetReference(string name)
{
var expression = new ReferenceExpression(name);
return new RegexNode(expression);
}