public bool TryParse(Tokens tokens, IScope scope, out IStatement statement)
{
// This is a block call
Variable variable = new Variable ( _executorFactory.GetVariableExecutor() );
variable.Scope = scope;
variable.Ident = tokens.PullToken ();
// Check if there is an indexer into the variable
if (tokens.PeekToken () == "[")
{
tokens.PullToken ();
variable.Indexer = _expressionParser.ParseExpression ( scope, tokens );
tokens.RemoveNextToken ("]");
}
if ( tokens.NextTokenIs("(") )
{
// Parse the parameters..
variable.Parameters = _expressionParser.ParseArray( scope, tokens ) as ArrayExpr;
}
statement = variable;
return true;
}
public void ExecuteBlockTest()
{
IKernel kernel = TestModule.GetTestKernel ();
IExecutorFactory factory = kernel.Get<IExecutorFactory> ();
Block statements = new Block ();
statements.Scope = new Scope();
Assign assign = new Assign ( factory.GetAssignExecutor () );
assign.Ident = new Variable ( factory.GetVariableExecutor () )
{
Ident = "x"
};
assign.Scope = statements.Scope;
Block block = new Block();
block.Scope = statements.Scope;
Print print = new Print ( factory.GetPrintExecutor () );
print.Scope = block.Scope;
print.Expr = new StringLiteral { Value = "Yo planet!" };
block.Add(print);
assign.Expr = block;
Assert.IsTrue ( assign.Scope != null );
statements.Add ( assign );
Variable variable = new Variable ( factory.GetVariableExecutor () );
variable.Ident = "x";
variable.Scope = statements.Scope;
statements.Add ( variable );
new Executor ( statements );
StandardOutDummy output = kernel.Get<IStandardOut> () as StandardOutDummy;
Assert.AreEqual ( "Yo planet!", output.Text );
}
/// <summary>
/// Value is a constant string, number or variable name.
/// </summary>
/// <param name="tokens"></param>
/// <returns></returns>
public Expression ParseValue( IScope scope, Tokens tokens )
{
Expression value = null;
if ( tokens.NextTokenIs ( BeginBlock ) )
{
value = _blockParser.GetBlock ( scope, tokens );
}
else if ( tokens.PeekToken().StartsWith ( "'" ) && tokens.PeekToken().EndsWith ( "'" ) )
{
string literal = tokens.PullToken().Trim ( '\'' );
value = new StringLiteral
{
Value = literal
};
}
else if ( tokens.PeekToken().IsNumber () )
{
value = new NumberLiteral
{
Value = double.Parse ( tokens.PullToken() )
};
}
else if ( tokens.NextTokenIs(BeginArray) )
{
return this.ParseArray ( scope, tokens );
}
else
{
var variable = new Variable ( _executorFactory.GetVariableExecutor () );
variable.Scope = scope;
variable.Ident = tokens.PullToken();
// Check if there is an indexer into the variable
if (tokens.PeekToken () == "[")
{
tokens.PullToken ();
variable.Indexer = ParseExpression ( scope, tokens );
tokens.RemoveNextToken ("]");
}
value = variable;
}
return value;
}
/// <summary>
/// Calls a block that this variable is assigned to.
/// Returns a Variable which holds a block if that was the
/// tail call of this block.
/// </summary>
public ITailCallExecution Execute( Variable variable, Dynamic parameters )
{
Dynamic dynamic = Scope.GetDynamic ( variable.Ident );
if (dynamic.Type == DynamicType.arrayType)
{
Dynamic index = variable.Indexer.Evaluate();
dynamic = dynamic.ArrayValue[(Int32)Math.Truncate (index.NumberValue)];
}
if ( dynamic.BlockValue != null )
{
_debug.PrintDebugInfo ( "Executing block : " + variable.Ident );
dynamic.BlockValue.Scope.AddDynamic ( "$", parameters );
ITailCallExecution tailCall = dynamic.BlockValue.ExecuteBlockWithTailCallElimination ();
if (tailCall != null)
_debug.PrintDebugInfo ( "Tail call returned : " + tailCall.ToString() );
return tailCall;
}
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 );
}