public void DefineVariableWithInitialValue()
{
Context context = new Context();
DefineVariableCommand expr = new DefineVariableCommand(null, "a", new ConstantExpression(1));
Assert.AreEqual(1, expr.Execute(context));
Assert.IsTrue(context.HasVariable("a"));
Assert.AreEqual(1, context.GetValue("a"));
Assert.AreEqual("a", expr.Name);
Assert.IsNull(expr.TypeExpression);
}
public void DefineVariableWithTypeAndInitialValue()
{
Context context = new Context();
IExpression typeexpr = new VariableExpression("List");
DefineVariableCommand expr = new DefineVariableCommand(typeexpr, "a", new ConstantExpression(1));
Assert.AreEqual(1, expr.Execute(context));
Assert.IsTrue(context.HasVariable("a"));
Assert.AreEqual(1, context.GetValue("a"));
Assert.AreEqual("a", expr.Name);
Assert.AreEqual(typeexpr, expr.TypeExpression);
}
public void ParseDefineVariable()
{
Parser parser = new Parser("var a;");
var result = parser.ParseCommand();
Assert.IsNotNull(result);
Assert.That(result is DefineVariableCommand);
DefineVariableCommand dvcmd = (DefineVariableCommand)result;
Assert.AreEqual("a", dvcmd.Name);
Assert.IsNull(dvcmd.Expression);
}
public void ParseDefineVariableWithValue()
{
Parser parser = new Parser("var a = 1;");
var result = parser.ParseCommand();
Assert.IsNotNull(result);
Assert.IsInstanceOfType(result, typeof(DefineVariableCommand));
DefineVariableCommand dvcmd = (DefineVariableCommand)result;
Assert.AreEqual("a", dvcmd.Name);
Assert.IsNotNull(dvcmd.Expression);
Assert.IsInstanceOfType(dvcmd.Expression, typeof(ConstantExpression));
}
private ICommand ParseDefineVariableCommand(IExpression typeexpression, string name)
{
DefineVariableCommand command;
if (this.TryParseToken("=", TokenType.Operator))
{
command = new DefineVariableCommand(typeexpression, name, this.ParseExpression());
}
else
{
command = new DefineVariableCommand(typeexpression, name);
}
this.ParseToken(";", TokenType.Separator);
return(command);
}