public override void Visit(Literal expression)
{
terminal.Peek().Append("'");
terminal.Peek().Append(Regex.Replace(expression.MatchText, @"'", @"\'"));
terminal.Peek().Append("'");
if (!expression.IsCaseSensitive)
{
terminal.Peek().Append(@"\i");
}
}
public override void Visit(Literal expression)
{
Boolean iscasesensitive = expression.IsCaseSensitive;
String data = expression.MatchText;
_matchStack.Push(
delegate(IInputIterator iterator)
{
foreach (Char c in data)
{
if (iscasesensitive)
{
if (iterator.Current() == -1)
return false;
if ((Byte)iterator.Current() != c)
{
iterator.Next();
return false;
}
}
else
{
if (iterator.Current() == -1)
return false;
if (Encoding.UTF8.GetString(new[] { (Byte)iterator.Current() }, 0, 1).ToUpper() != c.ToString().ToUpper())
{
iterator.Next();
return false;
}
}
iterator.Next();
}
return true;
}
);
}
public void Terminal_Literal()
{
var Mixed = new Literal {MatchText = "Hello World"};
var input = "hello world";
var bytes = Encoding.UTF8.GetBytes(input);
var iterator = new ByteInputIterator(bytes);
var visitor = new NpegParserVisitor(iterator);
Mixed.Accept(visitor);
Assert.IsFalse(visitor.IsMatch);
// Not case sensitve
Mixed.IsCaseSensitive = false;
input = "hello world";
bytes = Encoding.UTF8.GetBytes(input);
iterator = new ByteInputIterator(bytes);
visitor = new NpegParserVisitor(iterator);
Mixed.Accept(visitor);
Assert.IsTrue(visitor.IsMatch);
}
public abstract void Visit(Literal expression);
public void PracticalExample_PhoneNumber()
{
#region terminals
AExpression Digits = new CharacterClass {ClassExpression = "[0-9]"};
AExpression Hyphen = new Literal {MatchText = "-"};
#endregion
#region nonterminals
AExpression ThreeDigitCode = new CapturingGroup("ThreeDigitCode", new Sequence(Digits, Digits).Sequence(Digits));
AExpression FourDigitCode = new CapturingGroup("FourDigitCode",
new Sequence(Digits, Digits).Sequence(Digits).Sequence(Digits));
AExpression PhoneNumber = new CapturingGroup("PhoneNumber",
new Sequence(ThreeDigitCode, Hyphen)
.Sequence(ThreeDigitCode)
.Sequence(Hyphen)
.Sequence(FourDigitCode)
);
#endregion
String input = "123-456-7890";
// Test Manual Composite
var bytes = Encoding.UTF8.GetBytes(input);
var iterator = new ByteInputIterator(bytes);
var visitor = new NpegParserVisitor(iterator);
PhoneNumber.Accept(visitor);
Assert.IsTrue(visitor.IsMatch);
AstNode node = visitor.AST;
Assert.IsTrue(node.Token.Name == "PhoneNumber");
Assert.IsTrue(node.Token.ValueAsString(iterator) == "123-456-7890");
Assert.IsTrue(node.Children[0].Token.Name == "ThreeDigitCode");
Assert.IsTrue(node.Children[0].Token.ValueAsString(iterator) == "123");
Assert.IsTrue(node.Children[1].Token.Name == "ThreeDigitCode");
Assert.IsTrue(node.Children[1].Token.ValueAsString(iterator) == "456");
Assert.IsTrue(node.Children[2].Token.Name == "FourDigitCode");
Assert.IsTrue(node.Children[2].Token.ValueAsString(iterator) == "7890");
}