/// <summary>
/// Prints the variable to the console. If it's not a previously
/// assigned variable, it will print the variable name itself as
/// if it's an immediate value.
/// </summary>
/// <param name="console">Console to print to.</param>
public override void Handle(MBConsole console)
{
// Check for valid identifier
if (_ident == string.Empty)
{
console.Write("Parse error: Identifier expected.");
return;
}
// Check if the variable exists already
if (console.Vars.ContainsKey(_ident))
{
var printFmt = console.Vars[_ident].ToString();
// Format string between quotes for printing
if (console.Vars[_ident] is string)
{
printFmt = "\'" + printFmt + "\'";
}
console.Write(printFmt);
return;
}
double testDouble;
bool testBool;
// Checks immediate values. If not a valid string, double, or
// bool returns parse error, otherwise prints the variable name
// as if it was an immediate value.
if (_tokenType == Token.String)
{
console.Write("'{0}'", _ident);
}
else if (double.TryParse(_ident, out testDouble) ||
bool.TryParse(_ident, out testBool))
{
console.Write(_ident);
}
else
{
console.Write(
"Parse error: Unknown variable: '{0}'", _ident
);
}
}
/// <summary>
/// Handles setting the variable using the consoles Vars property.
/// Checks if the identifier only starts with an alpha or underscore
/// and handles any type checking or parse errors.
/// </summary>
/// <param name="console">Console to handle.</param>
public override void Handle(MBConsole console)
{
// Get the type-specific value from object
var typedVal = Convert.ChangeType(_value.Value, _value.Type);
// Check if identifier exists
if (_ident.Length <= 0)
{
console.Write("Parse error: Identifier expected.");
return;
}
// Check if value is valid
if (typedVal.GetType() == typeof(object))
{
console.Write("Parse error: Value expected.");
return;
}
// Check if identifier is valid
if (!Regex.Match(_ident, "[a-zA-Z_][a-zA-Z0-9_]*").Success)
{
console.Write(
"Parse error: Identifier must start with an" +
" alpha or underscore character."
);
return;
}
// Check if the console already has the variable and assign
// the new value if so
if (!console.Vars.ContainsKey(_ident))
{
console.AddVar(_ident, typedVal);
return;
}
// Otherwise create a new variable
console.Vars[_ident] = typedVal;
}
/// <summary>
/// Checks for valid identifier and executes the given function
/// from the console if correctly defined.
/// </summary>
/// <param name="console">Console to handle.</param>
public override void Handle(MBConsole console)
{
// Check for valid identifier
if (_ident.Length <= 0)
{
console.Write("Parse error: Identifier expected.");
return;
}
// Check if function exists
if (console.Funcs.ContainsKey(_ident))
{
console.Funcs[_ident].Invoke(_args);
}
else
{
console.Write(
"Parse error: Unknown function: '{0}'",
_ident
);
}
}