public void DefineCommand()
{
IList<ICommand> commandlist = new List<ICommand>();
commandlist.Add(new SetVariableCommand("a", new ConstantExpression(1)));
commandlist.Add(new SetVariableCommand("b", new ConstantExpression(2)));
CompositeCommand commands = new CompositeCommand(commandlist);
DefineCommand command = new DefineCommand("foo", null, commands);
Assert.AreEqual("foo", command.Name);
Assert.AreEqual(commands, command.Command);
}
public void ExecuteDefineCommand()
{
Context context = new Context();
IList<ICommand> commandlist = new List<ICommand>();
commandlist.Add(new SetVariableCommand("a", new ConstantExpression(1)));
commandlist.Add(new SetVariableCommand("b", new ConstantExpression(2)));
commandlist.Add(new ExpressionCommand(new VariableExpression("b")));
CompositeCommand commands = new CompositeCommand(commandlist);
DefineCommand command = new DefineCommand("foo", null, commands);
object result = command.Execute(context);
Assert.IsNull(result);
Assert.IsInstanceOfType(context.GetValue("foo"), typeof(DefinedMethod));
}
public void ExecuteCallExpression()
{
Context context = new Context();
IList<ICommand> commandlist = new List<ICommand>();
commandlist.Add(new SetVariableCommand("a", new ConstantExpression(1)));
commandlist.Add(new SetVariableCommand("b", new ConstantExpression(2)));
commandlist.Add(new ExpressionCommand(new VariableExpression("b")));
CompositeCommand commands = new CompositeCommand(commandlist);
DefinedMethod method = new DefinedMethod(null, commands);
CallExpression callexpr = new CallExpression(new ConstantExpression(method), null);
object result = callexpr.Evaluate(context);
Assert.AreEqual(2, result);
}
public void EvaluateDefinedMethod()
{
Context context = new Context();
IList<ICommand> commandlist = new List<ICommand>();
commandlist.Add(new SetVariableCommand("a", new ConstantExpression(1)));
commandlist.Add(new SetVariableCommand("b", new ConstantExpression(2)));
commandlist.Add(new ExpressionCommand(new VariableExpression("b")));
CompositeCommand commands = new CompositeCommand(commandlist);
DefinedMethod method = new DefinedMethod(null, commands);
context.SetValue("foo", method);
VariableExpression expr = new VariableExpression("foo");
Assert.AreEqual(2, expr.Evaluate(context));
}
public void ExecuteDefinedMethod()
{
Context context = new Context();
IList<ICommand> commandlist = new List<ICommand>();
commandlist.Add(new SetVariableCommand("a", new ConstantExpression(1)));
commandlist.Add(new SetVariableCommand("b", new ConstantExpression(2)));
commandlist.Add(new ExpressionCommand(new VariableExpression("b")));
CompositeCommand commands = new CompositeCommand(commandlist);
DefinedMethod method = new DefinedMethod(null, commands);
object result = method.Call(context, null);
Assert.IsNotNull(result);
Assert.AreEqual(2, result);
Assert.IsNull(context.GetValue("a"));
Assert.IsNull(context.GetValue("b"));
}
public void WhileWithAddExpression()
{
var expression = new CompareExpression(ComparisonOperator.Less, new VariableExpression("a"), new ConstantExpression(10));
var inccommand = new SetVariableCommand("k", new ArithmeticBinaryExpression(ArithmeticOperator.Add, new VariableExpression("k"), new ConstantExpression(1)));
var addcommand = new SetVariableCommand("a", new ArithmeticBinaryExpression(ArithmeticOperator.Add, new VariableExpression("k"), new VariableExpression("a")));
var command = new CompositeCommand(new ICommand[] { inccommand, addcommand });
var whilecommand = new WhileCommand(expression, command);
Context context = new Context();
context.SetValue("a", 0);
context.SetValue("k", 0);
var result = whilecommand.Execute(context);
Assert.IsNull(result);
Assert.IsNotNull(whilecommand.Condition);
Assert.IsNotNull(whilecommand.Command);
Assert.AreEqual(4, context.GetValue("k"));
Assert.AreEqual(10, context.GetValue("a"));
}
private WhileCommand ParseWhileCommand()
{
IExpression condition = this.ParseExpression();
this.ParseEndOfCommand();
ICommand command = new CompositeCommand(this.ParseCommands());
this.ParseToken("end", TokenType.Name);
return new WhileCommand(condition, command);
}
private IfCommand ParseIfCommand()
{
IExpression condition = this.ParseExpression();
if (!this.TryParseToken("then", TokenType.Name))
this.ParseEndOfCommand();
ICommand thencommand = new CompositeCommand(this.ParseCommands());
ICommand elsecommand = null;
if (this.TryParseToken("else", TokenType.Name))
elsecommand = new CompositeCommand(this.ParseCommands());
this.ParseEnd();
return new IfCommand(condition, thencommand, elsecommand);
}