public void TestCustomParsers()
{
var lht = new LiteralHandlerTable();
Assert.IsTrue(lht.AddParser(false, (Symbol)"fail", (text, marker) =>
{
Assert.AreEqual(marker.Name, "fail");
return(new LogMessage(Severity.Error, null, "Always fails"));
}));
Func <UString, Symbol, Either <object, LogMessage> > trimmer = (text, marker) =>
{
Assert.AreEqual(marker.Name, "trimmed");
return(text.ToString().Trim());
};
Assert.IsTrue(lht.AddParser(false, (Symbol)"trimmed", trimmer));
Assert.IsFalse(lht.AddParser(false, (Symbol)"trimmed", trimmer));
Assert.IsTrue(lht.AddParser(true, (Symbol)"trimmed", trimmer));
Assert.AreEqual("Hi", lht.TryParse(" Hi ", (Symbol)"trimmed").Left.Value);
Assert.AreEqual("Always fails", lht.TryParse(" Hi ", (Symbol)"fail").Right.Value.Format);
Assert.IsTrue(lht.TryParse("...", (Symbol)"undefined").Right.HasValue);
Assert.IsTrue(lht.TryParse("...", (Symbol)"undefined").Right.Value.Format.Contains("No parser is registered"));
}
public void TestCustomPrinters_InheritanceTest()
{
// ReversedListSource<T> is sufficiently complicated for this test. Inheritance:
//
// Many other interfaces Many other interfaces (including IListSource)
// ^ ^
// | |
// ICollectionImpl<T> IListAndListSource<T>
// ^ ^
// | |
// ReadOnlyCollectionBase<T> IListImpl<T>
// ^ ^
// | |
// ListSourceBase<T>------------------/
// ^
// |
// ReversedListSource<T>
var lht = new LiteralHandlerTable();
Assert.IsTrue(lht.AddPrinter(false, typeof(IListAndListSource <int>), PrintFirstElem));
Assert.IsTrue(lht.AddPrinter(false, typeof(IListSource <int>), PrintFail)); // Won't be used
var list = new DList <int> {
123, 456, 789
};
var rlist = new ReversedListSource <int>(list);
var sb = new StringBuilder();
Assert.AreEqual("list!", lht.TryPrint(CL(rlist, "list!"), sb).Left.Value.Name);
Assert.AreEqual("789", sb.ToString());
// Now add something that will have higher priority...
Assert.IsTrue(lht.AddPrinter(false, typeof(IListImpl <int>), PrintFirstChar));
Assert.AreEqual("eels", lht.TryPrint(CL(rlist, "cool!"), sb).Left.Value.Name);
Assert.AreEqual(1, sb.Length);
// Printer for base class ReadOnlyCollectionBase takes priority over interface IListImpl.
// And that one will fail. But the fallback will succeed.
Assert.IsTrue(lht.AddPrinter(false, typeof(ReadOnlyCollectionBase <int>), PrintFail));
Assert.AreEqual("eels", lht.TryPrint(CL(rlist, "..."), sb).Left.Value.Name);
Assert.AreEqual(1, sb.ToString().Length);
// Now install a printer that will succeed
Assert.IsTrue(lht.AddPrinter(true, typeof(ReadOnlyCollectionBase <int>), PrintFirstElem));
Assert.AreEqual("cool!", lht.TryPrint(CL(rlist, "cool!"), sb).Left.Value.Name);
Assert.AreEqual("789", sb.ToString());
}
public void TestCustomPrinters()
{
var lht = new LiteralHandlerTable();
// Can't add printer for null
Assert.IsFalse(lht.AddPrinter(true, (Type)null, PrintTrim));
Assert.IsFalse(lht.AddPrinter(true, (Symbol)null, PrintTrim));
// Add printer for "trim" marker and string
Assert.IsTrue(lht.AddPrinter(false, (Symbol)"trim", PrintTrim));
Assert.IsTrue(lht.AddPrinter(false, typeof(string), PrintTrim));
Assert.IsFalse(lht.AddPrinter(false, typeof(string), PrintTrim));
Assert.IsTrue(lht.AddPrinter(true, typeof(string), PrintTrim));
Assert.IsTrue(lht.AddPrinter(true, typeof(string), PrintTrim));
// Originally there is no printer for int
var sb = new StringBuilder();
Assert.IsTrue(lht.TryPrint(LNode.Literal(123), sb).Right.HasValue);
Assert.IsTrue(lht.TryPrint(LNode.Literal(123), sb).Right.Value.Format.Contains("no printer for type 'System.Int32'"));
Assert.AreEqual("", sb.ToString());
// Add a printer for int and try it
Assert.IsTrue(lht.AddPrinter(false, typeof(int), PrintTrim));
Assert.AreEqual("hovercraft", lht.TryPrint(CL(123, "fail"), sb).Left.Value.Name);
Assert.AreEqual("123", sb.ToString());
// Add printer for "fail" marker and try it.
Assert.IsTrue(lht.AddPrinter(false, (Symbol)"fail", PrintFail));
Assert.AreEqual("Always fails", lht.TryPrint(CL(new int[5], "fail"), sb).Right.Value.Format);
Assert.AreEqual("FAIL", sb.ToString());
// TypeMarker printers take priority, so "fail" runs at first. Then the handler for int runs.
Assert.AreEqual("hovercraft", lht.TryPrint(CL(999, "fail"), sb).Left.Value.Name);
Assert.AreEqual("999", sb.ToString());
// Try our string and trim modes
Assert.AreEqual("hovercraft", lht.TryPrint(LNode.Literal(" hi! "), sb).Left.Value.Name);
Assert.AreEqual("hi!", sb.ToString());
Assert.AreEqual("hovercraft", lht.TryPrint(CL(new StringBuilder(" bye! "), "trim"), sb).Left.Value.Name);
Assert.AreEqual("bye!", sb.ToString());
// TypeMarker printers take priority, so "firstChar" runs in preference to the string handler.
Assert.IsTrue(lht.AddPrinter(false, (Symbol)"firstChar", PrintFirstChar));
Assert.AreEqual("eels", lht.TryPrint(CL("hi! ", "firstChar"), sb).Left.Value.Name);
Assert.AreEqual("h", sb.ToString());
}
