public IInterpreter IfBranches()
{
var interpreter = new Interpreter.Interpreter();
foreach (var mutability in Options.AllMutabilityModes)
{
var env = Language.Environment.Create(new Options()
{
AllowInvalidMainResult = true
}.SetMutability(mutability));
var root_ns = env.Root;
var main_func = root_ns.AddBuilder(FunctionBuilder.Create(
"main",
ExpressionReadMode.OptionalUse,
NameFactory.Int64NameReference(),
Block.CreateStatement(new IExpression[] {
IfBranch.CreateIf(BoolLiteral.CreateFalse(), new[] { Return.Create(Int64Literal.Create("5")) },
IfBranch.CreateElse(new[] { Return.Create(Int64Literal.Create("2")) }))
})));
ExecValue result = interpreter.TestRun(env);
Assert.AreEqual(2L, result.RetValue.PlainValue);
}
return(interpreter);
}
public IErrorReporter ScopeShadowing()
{
NameResolver resolver = null;
foreach (var mutability in Options.AllMutabilityModes)
{
var env = Environment.Create(new Options() { ScopeShadowing = true, DiscardingAnyExpressionDuringTests = true }.SetMutability(mutability));
var root_ns = env.Root;
root_ns.AddBuilder(FunctionBuilder.Create(
"anything", null,
ExpressionReadMode.OptionalUse,
NameFactory.UnitNameReference(),
Block.CreateStatement(new IExpression[] {
VariableDeclaration.CreateStatement("x",null,Int64Literal.Create("2")),
Block.CreateStatement(new IExpression[]{
// shadowing
VariableDeclaration.CreateStatement("x", null, BoolLiteral.CreateFalse()),
VariableDeclaration.CreateStatement("a",NameFactory.BoolNameReference(),NameReference.Create("x")),
ExpressionFactory.Readout("a"),
}),
VariableDeclaration.CreateStatement("b",NameFactory.Int64NameReference(),NameReference.Create("x")),
ExpressionFactory.Readout("b"),
})));
resolver = NameResolver.Create(env);
Assert.AreEqual(0, resolver.ErrorManager.Errors.Count);
}
return resolver;
}
public IErrorReporter ErrorCannotInferResultType()
{
NameResolver resolver = null;
foreach (var mutability in Options.AllMutabilityModes)
{
var env = Environment.Create(new Options()
{
DiscardingAnyExpressionDuringTests = true
}.SetMutability(mutability));
var root_ns = env.Root;
IExpression lambda = FunctionBuilder.CreateLambda(null,
Block.CreateStatement(new IExpression[] {
IfBranch.CreateIf(BoolLiteral.CreateFalse(), new[] {
Return.Create(BoolLiteral.CreateTrue())
}),
Return.Create(Int64Literal.Create("2"))
})).Build();
root_ns.AddBuilder(FunctionBuilder.Create("me",
ExpressionReadMode.OptionalUse,
NameFactory.UnitNameReference(),
Block.CreateStatement(new IExpression[] {
// f = () => x
VariableDeclaration.CreateStatement("f", null, lambda),
ExpressionFactory.Readout("f")
})));
resolver = NameResolver.Create(env);
Assert.AreEqual(1, resolver.ErrorManager.Errors.Count);
Assert.IsTrue(resolver.ErrorManager.HasError(ErrorCode.CannotInferResultType, lambda));
}
return(resolver);
}
public IInterpreter ShortcutComputationInOptionalDeclaration()
{
var interpreter = new Interpreter.Interpreter();
foreach (var mutability in Options.AllMutabilityModes)
{
// purpose: check if RHS of the optional declaration is computed only when it is needed
// here we count RHS computations and since we declare two variables
// let (x,y) =? (None,Some)
// Some should not be executed, because `x` assigment fails first
var env = Language.Environment.Create(new Options()
{
DebugThrowOnError = true,
DiscardingAnyExpressionDuringTests = true,
}.SetMutability(mutability));
var root_ns = env.Root;
root_ns.AddBuilder(TypeBuilder.Create("Mutator")
.SetModifier(EntityModifier.Mutable)
.With(VariableDeclaration.CreateStatement("c", NameFactory.IntNameReference(), null,
env.Options.ReassignableModifier() | EntityModifier.Public)));
// return Some or None depending on the `f` parameter, and also increments the count of option evaluations
root_ns.AddBuilder(FunctionBuilder.Create("give", NameFactory.OptionNameReference(NameFactory.Nat8NameReference()),
Block.CreateStatement(
ExpressionFactory.Inc(() => NameReference.Create("m", "c")),
Return.Create(ExpressionFactory.Ternary(NameReference.Create("f"),
ExpressionFactory.OptionOf(NameFactory.Nat8NameReference(), Nat8Literal.Create("11")),
ExpressionFactory.OptionEmpty(NameFactory.Nat8NameReference())))
))
.Parameters(FunctionParameter.Create("f", NameFactory.BoolNameReference()),
FunctionParameter.Create("m", NameFactory.ReferenceNameReference(NameReference.Create("Mutator")))));
IExpression opt_declaration = ExpressionFactory.OptionalDeclaration(new[] {
VariablePrototype.Create("x", NameFactory.Nat8NameReference()),
VariablePrototype.Create("y", NameFactory.Nat8NameReference())
}, new[] {
FunctionCall.Create("give", BoolLiteral.CreateFalse(), NameReference.Create("mut")),
FunctionCall.Create("give", BoolLiteral.CreateTrue(), NameReference.Create("mut")),
});
root_ns.AddBuilder(FunctionBuilder.Create("main",
ExpressionReadMode.OptionalUse,
NameFactory.Nat8NameReference(),
Block.CreateStatement(
VariableDeclaration.CreateStatement("mut", null, ExpressionFactory.StackConstructor(NameReference.Create("Mutator"))),
IfBranch.CreateIf(opt_declaration,
new[] {
ExpressionFactory.Readout("x"),
ExpressionFactory.Readout("y"),
ExpressionFactory.GenericThrow(),
},
IfBranch.CreateElse(
// crucial check -- we should not evaluate the second option
ExpressionFactory.AssertEqual(IntLiteral.Create("1"), NameReference.Create("mut", "c"))
)),
Return.Create(Nat8Literal.Create("0"))
)));
ExecValue result = interpreter.TestRun(env);
Assert.AreEqual((byte)0, result.RetValue.PlainValue);
}
return(interpreter);
}
public static IExpression OptionalAssignment(IEnumerable <IExpression> lhsExpressions, IEnumerable <IExpression> rhsExpressions)
{
// todo: add support for spread
if (lhsExpressions.Count() != rhsExpressions.Count())
{
throw new NotImplementedException();
}
// please note we could have dummy assignments in form
// _ ?= x
// in such case we are not interested in the assigment but the fact it was sucessful or not
lhsExpressions = lhsExpressions.Select(lhs => lhs is NameReference lhs_name && lhs_name.IsSink ? null : lhs);
var temp_names = new List <string>();
IExpression condition = null;
foreach (Tuple <IExpression, IExpression> pair in rhsExpressions.SyncZip(lhsExpressions))
{
IExpression rhs = pair.Item1;
IExpression lhs = pair.Item2;
IExpression opt;
if (lhs == null)
{
temp_names.Add(null);
opt = rhs;
}
else
{
string temp = AutoName.Instance.CreateNew("optassign");
temp_names.Add(temp);
opt = VariableDeclaration.CreateExpression(temp, null, rhs);
}
IExpression curr = NameReference.Create(opt, BrowseMode.Decompose, NameFactory.OptionHasValue);
if (condition == null)
{
condition = curr;
}
else
{
condition = And(condition, curr);
}
}
var success_body = new List <IExpression>();
{
foreach (Tuple <IExpression, string> pair in lhsExpressions.SyncZip(temp_names))
{
IExpression lhs = pair.Item1;
string temp = pair.Item2;
if (lhs != null)
{
success_body.Add(Assignment.CreateStatement(lhs,
NameReference.Create(NameReference.Create(temp), BrowseMode.Decompose, NameFactory.OptionValue)));
}
}
success_body.Add(BoolLiteral.CreateTrue());
}
IfBranch result = IfBranch.CreateIf(condition,
success_body,
IfBranch.CreateElse(BoolLiteral.CreateFalse()));
return(result);
}