public void TestInteger()
{
var p = Prim.Integer();
Assert.True(!p.Parse("123").IsFaulted&& p.Parse("123").Value.Single().Item1 == 123);
Assert.True(!p.Parse("-123").IsFaulted&& p.Parse("-123").Value.Single().Item1 == -123);
Assert.True(!p.Parse(int.MaxValue.ToString()).IsFaulted&& p.Parse(int.MaxValue.ToString()).Value.Single().Item1 == int.MaxValue);
// Bug here in both .NET and Mono, neither can parse an Int32.MinValue, overflow exception is thrown.
//Assert.True(!p.Parse(int.MinValue.ToString()).IsFaulted && p.Parse(int.MinValue.ToString()).Value.Single().Item1 == int.MinValue);
}
public void BuildLangParser()
{
var opChars = ";.,<>?/\\|\"':=+-_*&^%$£@!".AsEnumerable();
Id = from w in Prim.WhiteSpace()
from c in Prim.Letter()
from cs in Prim.Many(Prim.LetterOrDigit())
select c.Cons(cs);
Op = (from w in Prim.WhiteSpace()
from o in Prim.Satisfy(c => opChars.Contains(c), "an operator")
from os in Prim.Many(Prim.Satisfy(c => opChars.Contains(c), "an operator"))
select o.Cons(os))
.Fail("an operator");
Ident = (from s in Id
where
s.IsNotEqualTo("let") &&
s.IsNotEqualTo("in")
select s)
.Fail("identifier");
LetId = (from s in Id
where s.IsEqualTo("let")
select s)
.Fail("let");
InId = (from s in Id
where s.IsEqualTo("in")
select s)
.Fail("'in'");
Semi = (from s in Op
where s.IsEqualTo(";")
select s)
.Fail("';'");
LambdaArrow = (from s in Op
where s.IsEqualTo("=>")
select s)
.Fail("a lambda arrow '=>'");
Integer = (from w in Prim.WhiteSpace()
from d in Prim.Integer()
select new IntegerTerm(d) as Term)
.Fail("an integer");
String = (from w in Prim.WhiteSpace()
from o in Prim.Character('"')
from cs in Prim.Many(Prim.Satisfy(c => c != '"'))
from c in Prim.Character('"')
select new StringTerm(cs) as Term)
.Fail("a string literal");
Term1 = Integer
| String
| (from x in Ident
select new VarTerm(x) as Term)
| (from u1 in Lang.WsChr('(')
from t in Term
from u2 in Lang.WsChr(')')
select t)
.Fail("a term");
Term = (from x in Ident
from arrow in LambdaArrow
from t in Term
select new LambdaTerm(x, t) as Term)
| (from lid in LetId
from x in Ident
from u1 in Lang.WsChr('=')
from t in Term
from s in Semi
from c in Term
select new LetTerm(x, t, c) as Term)
| (from t in Term1
from ts in Prim.Many(Term1)
select new AppTerm(t, ts) as Term)
.Fail("a term");
Parser = from t in Term
from u in Lang.WsChr(';')
from w in Prim.WhiteSpace()
select t;
}