public void AlternativeParser()
{
var stream = new MemoryStream <char>("a".AsMemory());
var p1 = Combinator.Alt(Combinator.Char('x'), Combinator.Char('y'), Combinator.Char('z'));
var p2 = Combinator.Alt(Combinator.Char('a'), Combinator.Char('b'), Combinator.Char('c'));
var r1 = p1.Parse(stream);
var r2 = p2.Parse(stream);
Assert.False(r1.IsOk);
Assert.True(r2.IsOk);
Assert.Equal('a', r2.Ok.Value);
}
public void OptParser()
{
var stream1 = new MemoryStream <char>("a".AsMemory());
var stream2 = new MemoryStream <char>("b".AsMemory());
var p = Combinator.Opt(Combinator.Char('a'));
var r1 = p.Parse(stream1);
var r2 = p.Parse(stream2);
Assert.True(r1.IsOk);
Assert.True(r2.IsOk);
Assert.Equal('a', r1.Ok.Value);
Assert.Equal(default, r2.Ok.Value);
public void SequenceParser()
{
var stream = new MemoryStream <char>("abc".AsMemory());
var p1 = Combinator.Seq(Combinator.Char('a'), Combinator.Char('b'), Combinator.Char('d'));
var p2 = Combinator.Seq(Combinator.Char('a'), Combinator.Char('b'), Combinator.Char('c'));
var r1 = p1.Parse(stream);
var r2 = p2.Parse(stream);
Assert.False(r1.IsOk);
Assert.True(r2.IsOk);
Assert.Equal(('a', 'b', 'c'), r2.Ok.Value);
}
public void Repeat1Parser()
{
var emptyStream = new MemoryStream <char>(string.Empty.AsMemory());
var nonEmptyStream = new MemoryStream <char>("aaa".AsMemory());
var p = Combinator.Rep1(Combinator.Char('a'));
var r1 = p.Parse(emptyStream);
var r2 = p.Parse(nonEmptyStream);
Assert.False(r1.IsOk);
Assert.True(r2.IsOk);
Assert.Equal(3, r2.Ok.Value.Count);
Assert.Equal('a', r2.Ok.Value[0]);
Assert.Equal('a', r2.Ok.Value[1]);
Assert.Equal('a', r2.Ok.Value[2]);
}