public IErrorReporter ErrorUnusedVariableWithinUsedExpression()
{
NameResolver resolver = null;
foreach (var mutability in Options.AllMutabilityModes)
{
var env = Environment.Create(new Options()
{
DiscardingAnyExpressionDuringTests = true
}.SetMutability(mutability));
var root_ns = env.Root;
VariableDeclaration decl = VariableDeclaration.CreateExpression("result", NameFactory.Int64NameReference(), initValue: Undef.Create());
root_ns.AddBuilder(FunctionBuilder.Create("anything", null,
ExpressionReadMode.OptionalUse,
NameFactory.UnitNameReference(),
Block.CreateStatement(
// the declaration-expression is used, but the variable itself is not
// thus we report it as unused (in such code user should pass the init-value itself w/o creating variable)
ExpressionFactory.Readout(decl)
)));
resolver = NameResolver.Create(env);
Assert.AreEqual(1, resolver.ErrorManager.Errors.Count);
Assert.IsTrue(resolver.ErrorManager.HasError(ErrorCode.BindableNotUsed, decl.Name));
}
return(resolver);
}
public IErrorReporter ErrorReservedKeyword()
{
NameResolver resolver = null;
foreach (var mutability in Options.AllMutabilityModes)
{
var env = Environment.Create(new Options() { DiscardingAnyExpressionDuringTests = true }.SetMutability(mutability));
var root_ns = env.Root;
VariableDeclaration decl = VariableDeclaration.CreateExpression(NameFactory.RecurFunctionName, null, Int64Literal.Create("3"));
root_ns.AddBuilder(FunctionBuilder.Create(
"anything", null,
ExpressionReadMode.OptionalUse,
NameFactory.UnitNameReference(),
Block.CreateStatement(new IExpression[] {
ExpressionFactory.Readout( decl)
})));
resolver = NameResolver.Create(env);
Assert.AreEqual(1, resolver.ErrorManager.Errors.Count);
Assert.IsTrue(resolver.ErrorManager.HasError(ErrorCode.ReservedName, decl.Name));
}
return resolver;
}
public IErrorReporter ErrorIfScope()
{
NameResolver resolver = null;
foreach (var mutability in Options.AllMutabilityModes)
{
var env = Environment.Create(new Options()
{
DiscardingAnyExpressionDuringTests = true,
}.SetMutability(mutability));
var root_ns = env.Root;
NameReference bad_ref = NameReference.Create("x");
root_ns.AddBuilder(FunctionBuilder.Create(
"testing",
NameFactory.UnitNameReference(),
Block.CreateStatement(
VariableDeclaration.CreateStatement("b", NameFactory.BoolNameReference(), Undef.Create(),
env.Options.ReassignableModifier()),
IfBranch.CreateIf(VariableDeclaration.CreateExpression("x", null, BoolLiteral.CreateTrue()),
// x is in scope
Assignment.CreateStatement("b", "x"),
IfBranch.CreateElse(
// x is in scope as well
Assignment.CreateStatement("b", "x"))),
// here x is not in the scope (is already removed)
Assignment.CreateStatement(NameReference.Create("b"), bad_ref),
ExpressionFactory.Readout("b")
)));
resolver = NameResolver.Create(env);
Assert.AreEqual(1, resolver.ErrorManager.Errors.Count);
Assert.IsTrue(resolver.ErrorManager.HasError(ErrorCode.ReferenceNotFound, bad_ref));
}
return(resolver);
}
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);
}