public void Or_FirstSuccess_ReturnsFirstResult()
{
var parser = Combine.Or(Parse.Succeed('x'), Parse.Succeed('y'));
var result = parser.Parse("");
ParseAssert.ValueEquals('x', result);
}
public void Or_FirstError_ReturnsSecondResult()
{
var parser = Combine.Or(Parse.Fail <int>("test"), Parse.Succeed(42));
var result = parser.Parse("");
ParseAssert.ValueEquals(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);
}