/// <summary>
/// MainPageViewModel constructor.
/// In this constructor, The view initialization and commands bindings are completed. </summary>
public MainPageViewModel()
{
SetDisplayEmpty();
SetDegreeButton(true);
if (Calculator.InputParserInstance.IsEmptyInputElements == false)
{
IEnumerable <InputElement> plainTexts = Calculator.InputParserInstance.ExpressionElements;
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ResultText = result;
ExpressionText = expression;
UpdateDisplay();
}
this.PressButton = new Command((value) =>
{
string input = value.ToString();
IEnumerable <InputElement> plainTexts;
AddingElementResult res = Calculator.InputParserInstance.GetseparatedPlainText(input, out plainTexts);
if ((res is AddingPossible) == false)
{
DisplayError(res.Message);
return;
}
var commands = new Dictionary <string, string>
{
{ "F", "Factorial [ x! ]" },
{ "Q", "Square Root" },
{ "S", "Sine [ sin(x) ]" },
{ "C", "Cosine [ cos(x) ]" },
{ "T", "Tangent [ tan(x) ]" },
{ "N", "Natural Logarithm [ ln(x) ]" },
{ "G", "Common Logarithm [ log(x) ]" },
{ "O", "Multiplicative Inverse [ 1/x ]" },
{ "V", "Square [ x^2 ]" },
{ "P", "Exponent of 10 [ 10^x ]" },
{ "W", "Exponent [ y^x ]" },
{ "A", "Absolute Value [ |x| ]" },
{ "+", "Addition" },
{ "-", "Subtraction" },
{ "*", "Multiplication" },
{ "/", "Division" },
{ "%", "Percentage" }
};
string commandValue;
try
{
if (commands.TryGetValue(input, out commandValue))
{
Analytics.TrackEvent("Operation", new Dictionary <string, string> {
{ "operation", commandValue },
{ "Mode", (Calculator.FormatterInstance.IsLandscapeOrientation ? "Scientific" : "Regular") }
});
}
}
catch (System.Exception exc)
{
MobileCenterLog.Debug(MobileCenterLog.LogTag, $"{exc}");
}
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
this.Clear = new Command(() =>
{
SetDisplayEmpty();
Calculator.InputParserInstance.Clear();
});
this.RemoveLast = new Command(() =>
{
IEnumerable <InputElement> plainTexts;
if (Calculator.InputParserInstance.DeleteLast(out plainTexts) == false)
{
return;
}
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
this.Equal = new Command(() =>
{
IEnumerable <InputElement> plainTexts;
if (Calculator.InputParserInstance.Equal(out plainTexts) == false)
{
return;
}
FormattedString result;
FormattedString expression;
if (GetEqualResult(plainTexts, out expression, out result) == false)
{
return;
}
Calculator.InputParserInstance.Set(Calculator.CalculatorInstance.Result.ToString());
ExpressionText = "";
ResultText = result;
UpdateDisplay(true);
});
this.Reverse = new Command(() =>
{
IEnumerable <InputElement> plainTexts;
if (Calculator.InputParserInstance.ReverseSign(out plainTexts) == false)
{
DisplayError("Invalid format used.");
return;
}
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
this.ChangeDegreeMetric = new Command(() =>
{
SetDegreeButton();
FormattedString result;
FormattedString expression;
GetCalculatedResult(Calculator.InputParserInstance.ExpressionElements, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
}
/// <summary>
/// A method adds inputted element to exists expression and validate the expression with adding a inputted element. </summary>
/// <param name="input"> A inputted element </param>
/// <param name="separated"> A infix notation expression InputElement list </param>
/// <returns> A element adding result status </returns>
public AddingElementResult GetseparatedPlainText(string input, out IEnumerable <InputElement> separated)
{
double inputNumber;
separated = expressionElements;
if (input.Length < 1)
{
IsLastValidationSucceed = false;
return(new InvalidFormatUsed());
}
if (Double.TryParse(input, out inputNumber))
{
Literal InputLiteral = new Literal(input);
if (IsEmptyInputElements)
{
expressionElements.Add(InputLiteral);
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
else
{
AddingElementResult res = expressionElements.Last().CheckPossibilityAddingElement(ref expressionElements,
ref IsEqualUsed, ref IsLastValidationSucceed, InputLiteral);
IsEqualUsed = false;
if (res is AddingPossible)
{
IsLastValidationSucceed = true;
}
else
{
IsLastValidationSucceed = false;
}
return(res);
}
}
InputElement inputElem = Operators.GetOperatorAsInputElement(input);
IOperator inputOper = inputElem as IOperator;
if (inputOper == null)
{
IsLastValidationSucceed = false;
return(new InvalidFormatUsed());
}
if (IsEmptyInputElements)
{
if (OperandType.LEFT == inputOper.OperandType ||
OperandType.BOTH == inputOper.OperandType)
{
// Exceptional Case : '.' => '0.'
if (inputOper is Point)
{
expressionElements.Add(new Literal("0"));
}
else
{
return(new InvalidFormatUsed());
}
}
expressionElements.Add(inputElem);
Operators.GetOperatorAsInputElement(input)?.PostAddingWork(ref expressionElements);
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
if (inputElem.AlternativeWork(ref expressionElements, ref IsEqualUsed, ref IsLastValidationSucceed))
{
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
// Exceptional case : Only one '.'
if (input.CompareTo(".") == 0)
{
if (CheckDotExist())
{
separated = expressionElements;
IsLastValidationSucceed = true;
return(new AddingImpossible());
}
}
else if (input.CompareTo("R") == 0)
{
if (ReverseSign(out separated))
{
return(new AddingPossible());
}
return(new InvalidFormatUsed());
}
expressionElements.Last().CheckPossibilityAddingElement(ref expressionElements, ref IsEqualUsed, ref IsLastValidationSucceed, inputOper as InputElement);
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
/// <summary>
/// MainPageViewModel constructor.
/// In this constructor, The view initialization and commands bindings are completed. </summary>
private MainPageViewModel()
{
SetDisplayEmpty();
SetDegreeButton(true);
if (Calculator.InputParserInstance.IsEmptyInputElements == false)
{
IEnumerable <InputElement> plainTexts = Calculator.InputParserInstance.ExpressionElements;
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ResultText = result;
ExpressionText = expression;
UpdateDisplay();
}
this.PressButton = new Command((value) =>
{
string input = value.ToString();
IEnumerable <InputElement> plainTexts;
AddingElementResult res = Calculator.InputParserInstance.GetseparatedPlainText(input, out plainTexts);
if ((res is AddingPossible) == false)
{
DisplayError(res.Message);
return;
}
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
this.Clear = new Command(() =>
{
SetDisplayEmpty();
Calculator.InputParserInstance.Clear();
});
this.RemoveLast = new Command(() =>
{
IEnumerable <InputElement> plainTexts;
if (Calculator.InputParserInstance.DeleteLast(out plainTexts) == false)
{
return;
}
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
this.Equal = new Command(() =>
{
IEnumerable <InputElement> plainTexts;
if (Calculator.InputParserInstance.Equal(out plainTexts) == false)
{
return;
}
FormattedString result;
FormattedString expression;
if (GetEqualResult(plainTexts, out expression, out result) == false)
{
return;
}
Calculator.InputParserInstance.Set(Calculator.CalculatorInstance.Result.ToString());
ExpressionText = string.Empty;
ResultText = result;
UpdateDisplay(true);
});
this.Reverse = new Command(() =>
{
IEnumerable <InputElement> plainTexts;
if (Calculator.InputParserInstance.ReverseSign(out plainTexts) == false)
{
DisplayError("Invalid format used.");
return;
}
FormattedString result;
FormattedString expression;
GetCalculatedResult(plainTexts, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
this.ChangeDegreeMetric = new Command(() =>
{
SetDegreeButton();
FormattedString result;
FormattedString expression;
GetCalculatedResult(Calculator.InputParserInstance.ExpressionElements, false, out expression, out result);
ExpressionText = expression;
ResultText = result;
UpdateDisplay();
});
}