public void Fail_ReturnsParseError()
{
var parser = Parse.Fail <int>("test");
var result = parser.Parse("");
ParseAssert.ErrorEquals("test", result);
}
public void Not_Success_ReturnsError()
{
var parser = Parse.Not(Chars.Any());
var result = parser.Parse("xyz");
ParseAssert.ErrorEquals("Unexpected \"x\"", result);
}
public void Label_Error_ReturnsErrorWithMessage()
{
var parser = Parse.Fail <int>("Oh noes").Label(() => "Test");
var result = parser.Parse("");
ParseAssert.ErrorEquals("Test", result);
}
public void Select_Error_ReturnsError()
{
var parser = from i in Parse.Fail <int>("test")
select i * 2;
var result = parser.Parse("");
ParseAssert.ErrorEquals("test", result);
}
public void Where_Error_ReturnsError()
{
var parser = from x in Parse.Fail <int>("test")
where x == 42
select x;
var result = parser.Parse("");
ParseAssert.ErrorEquals("test", result);
}
public void SelectMany_SuccessThenError_ReturnsErrorValue()
{
var parser = from x in Parse.Succeed(21)
from y in Parse.Fail <int>("test")
select x *y;
var result = parser.Parse("");
ParseAssert.ErrorEquals("test", result);
}
public void Where_FailingPredicate_ReturnsError()
{
var parser = from x in Parse.Succeed(42)
where x != 42
select x;
var result = parser.Parse("");
ParseAssert.ErrorEquals("Unexpected \"42\"", result);
}
public void Or_FirstErrorConsumesInput_ReturnsFirstError()
{
var parserA = from x in Chars.Any()
from y in Parse.Fail <char>("test")
select y;
var parserB = Chars.Any();
var parser = Combine.Or(parserA, parserB);
var result = parser.Parse("abc");
ParseAssert.ErrorEquals("test", result);
}
