public bool TryParse(Tokens tokens, IScope scope, out IStatement statement)
{
if ( tokens.PeekToken () == IfTag )
{
tokens.RemoveNextToken ( IfTag );
If iff = new If ( _executorFactory.GetIfExecutor ());
iff.Test = _expressionParser.ParseExpression ( scope, tokens );
iff.Body = _blockParser.GetBlock ( scope, tokens );
statement = iff;
return true;
}
statement = null;
return false;
}
/// <summary>
/// Returns a variable to execute if it was the tail call of the if block.
/// </summary>
public ITailCallExecution Execute( If info )
{
_debug.PrintDebugInfo ( "Checking If" );
Dynamic test = info.Test.Evaluate ();
if ( test.BoolValue )
{
_debug.PrintDebugInfo ( "If passed" );
return info.Body.ExecuteBlockWithTailCallElimination ();
}
return null;
}
public void SimpleIfTest()
{
IKernel kernel = TestModule.GetTestKernel ();
IExecutorFactory factory = kernel.Get<IExecutorFactory> ();
Block statements = new Block ();
statements.Scope = new Scope ();
Assign assign = new Assign ( factory.GetAssignExecutor () );
assign.Scope = statements.Scope;
assign.Ident = new Variable ( factory.GetVariableExecutor () )
{
Ident = "x"
};
assign.Expr = new NumberLiteral
{
Value = 5
};
statements.Add ( assign );
If iif = new If ( factory.GetIfExecutor() );
Variable variable = new Variable ( factory.GetVariableExecutor () );
( variable as Variable ).Ident = "x";
iif.Scope = statements.Scope;
iif.Test = new ArithExpr
{
Scope = iif.Scope,
Left = variable,
Op = ArithOp.Equality,
Right = new NumberLiteral
{
Value = 5
}
};
iif.Body = new Block ();
iif.Body.Scope = statements.Scope;
Print print = new Print ( factory.GetPrintExecutor () );
Variable call = new Variable ( factory.GetVariableExecutor () );
( call as Variable ).Ident = "x";
print.Expr = call;
print.Scope = iif.Body.Scope;
call.Scope = iif.Body.Scope;
iif.Body.Add( print );
statements.Add ( iif );
new Executor ( statements );
StandardOutDummy output = kernel.Get<IStandardOut> () as StandardOutDummy;
Assert.AreEqual ( "5", output.Text );
}