/// <summary>
/// Will update text in input TextBox and set cursor on correct position
/// </summary>
/// <param name="str"></param>
private void AddStringToEquation(string str)
{
string destination = MainEquationInputTextBox.Text;
StringControl.InsertString(ref destination, str, ref _cursor);
UpdateMainEquationInputTextBoxText(destination);
}
/// <summary>
/// fill multiply operators between:
/// constant | number;
/// number | constant;
/// constant | constant;
/// ) | constant, number, (;
/// constant, number | (;
/// constant, number, ) | function;
/// (if there is no operator)
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation with filled multiply operators where are required</returns>
private static string FixMissingMultiplyOperator(string equation)
{
for (int i = equation.Length - 1; i > 0; --i)
{
char ch1 = equation[i - 1];
char ch2 = equation[i];
// constant | number
if ((StringControl.IsLastCharOfConstantConstant(ch1) &&
StringControl.GetConstantStringByLastChar(equation.Substring(0, i)) != string.Empty
&& StringControl.IsNumberChar(ch2))
// number | constant
|| (StringControl.IsNumberChar(ch1)
&& StringControl.IsFirstCharOfConstantConstant(ch2) &&
StringControl.GetConstantString(equation.Substring(i)) != string.Empty)
// constant | constant
|| (StringControl.IsLastCharOfConstantConstant(ch1) &&
StringControl.GetConstantStringByLastChar(equation.Substring(0, i)) != string.Empty
&& StringControl.IsFirstCharOfConstantConstant(ch2) &&
StringControl.GetConstantString(equation.Substring(i)) != string.Empty)
// ) | constant number (
|| (ch1 == ')'
&& (StringControl.IsNumberChar(ch2) ||
StringControl.IsFirstCharOfConstantConstant(ch2) &&
StringControl.GetConstantString(equation.Substring(i)) != string.Empty ||
ch2 == '('))
// constant number | (
|| ((StringControl.IsNumberChar(ch1) ||
StringControl.IsLastCharOfConstantConstant(ch1) &&
StringControl.GetConstantStringByLastChar(equation.Substring(0, i)) != string.Empty)
&& ch2 == '(')
// constant number ) | function
|| ((StringControl.IsNumberChar(ch1) ||
StringControl.IsLastCharOfConstantConstant(ch1) &&
StringControl.GetConstantStringByLastChar(equation.Substring(0, i)) != string.Empty ||
ch1 == ')')
&& Operators.IsFirstCharOfFunctionOperator(ch2) &&
Operators.GetOperator(equation.Substring(i)) != OperatorsEnum.None)
)
{
equation = equation.Insert(i, Strings.Multiply);
}
}
return(equation);
}
/// <summary>
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation string with simplified operators</returns>
private static string SimplifyOperatorsInsideEquation(string equation)
{
for (int i = 0; i < Operators.OperatorsToReplace.Length / 2; i += 1)
{
equation = StringControl.ReplaceAll(equation, Operators.OperatorsToReplace[i * 2],
Operators.OperatorsToReplace[i * 2 + 1]);
}
return(equation);
}
/// <summary>
/// will delete char from MainEquationInputTextBox and set cursor
/// </summary>
/// <param name="sender">button</param>
/// <param name="e">click event</param>
private void DelButton_Click(object sender, RoutedEventArgs e)
{
if (_cursor > 0)
{
UpdateMainEquationInputTextBoxText(
StringControl.RemoveCharFromString(MainEquationInputTextBox.Text, ref _cursor));
HandleChangeInEquation();
}
}
/// <summary>
/// will check equation if there are no unknown characters
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>true if equation does not contains unknown character else false if contains</returns>
private bool CheckUnknownCharacter(string equation)
{
int i = 0;
while (equation.Length > i)
{
// check if is constant -> the it is good :)
if (StringControl.IsFirstCharOfConstantConstant(equation[i]) &&
StringControl.GetConstantString(equation.Substring(i)) != string.Empty)
{
i += StringControl.GetConstantString(equation.Substring(i)).Length;
}
else if (StringControl.IsNumberChar(equation[i]))
{
// get string of number characters
string substring = string.Empty;
do
{
substring += equation[i++];
}while (equation.Length > i && StringControl.IsNumberChar(equation[i]));
// check if string can be converted to number
try
{
StringToDouble(substring, ref _error);
}
catch
{
return(false);
}
}
else
{
// get string of all another characters
string substring = string.Empty;
do
{
substring += equation[i++];
}while (equation.Length > i && !StringControl.IsNumberChar(equation[i]) &&
!(StringControl.IsFirstCharOfConstantConstant(equation[i]) &&
StringControl.GetConstantString(equation.Substring(i)) !=
string.Empty));
if (!CheckStringOfOperators(substring))
{
_error = ErrorsEnum.InvalidSequenceOfCharacters;
return(false);
}
}
}
return(true);
}
/// <summary>
/// calculate result,
/// if there is error, print error instead of invalid result
/// </summary>
private void Calculate()
{
double?result = _calculator.Calculate(MainEquationInputTextBox.Text);
ShowResult(result.HasValue ? StringControl.DoubleToString(result.Value) : _calculator.GetError());
if (result.HasValue)
{
ShowAns();
}
}
/// <summary>
/// </summary>
/// <param name="equation">string containing equation</param>
/// <param name="index">index of ending char of number or ending bracket</param>
/// <returns>starting index of number or starting index of corresponding bracket to given bracket</returns>
private int GetStartingIndexOfNumberOrStringInsideBracketOnIndex(string equation, int index)
{
int startingIndex = index;
if (equation[index] == ')')
{
// if there is bracket on index, return index of starting bracket
startingIndex = GetStartingBracketOfBracketOnIndex(equation, index);
}
else
{
// else check for staring index of number or constant
while (startingIndex >= 0 &&
(StringControl.IsNumberChar(equation[startingIndex]) ||
StringControl.IsLastCharOfConstantConstant(equation[startingIndex])))
{
if (StringControl.IsLastCharOfConstantConstant(equation[startingIndex]))
{
string constant =
StringControl.GetConstantStringByLastChar(equation.Substring(0, startingIndex + 1));
if (constant == string.Empty)
{
break;
}
startingIndex -= constant.Length;
}
else
{
--startingIndex;
}
}
++startingIndex;
}
if (index < startingIndex)
{
// if there if no number/ constant/ bracket
_error = ErrorsEnum.OperatorDoNotHaveEnoughArguments;
throw new SyntaxErrorException();
}
if (startingIndex == -1)
{
// shouldn't happened - fixed before solving tree
_error = ErrorsEnum.UnknownError;
throw new SyntaxErrorException();
}
return(startingIndex);
}
/// <summary>
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation without brackets but same size with number characters on place brackets and their content</returns>
private string ReplaceBracketsAndTheirContentWithNumberCharacters(string equation)
{
while (equation.Contains('('))
{
int startingIndex = equation.IndexOf('(');
int endingIndex = GetEndingBracketOfBracketOnIndex(equation, startingIndex);
int length = endingIndex - startingIndex + 1;
string numberChars = StringControl.GenerateStringOfNumberCharacters(length);
equation = equation.Remove(startingIndex, length).Insert(startingIndex, numberChars);
}
return(equation);
}
/// <summary>
/// Will add brackets if there are more unctions without brackets
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation</returns>
private string FixFunctionInFunctionWithoutBracket(string equation)
{
string tmpEquation = equation;
List <int> indexesForStartingBracket = new List <int>();
List <int> indexesForEndingBracket = new List <int>();
// search for last one argument operator
int op;
while ((op = GetLastIndexOfOperatorFromEnumArray(tmpEquation, Operators.OperatorsPriority1)) != -1)
{
int lengthOfOperator = Operators.GetOperatorFromEnum(Operators.GetOperator(tmpEquation.Substring(op)))
.Length;
// getting indexes for brackets
indexesForStartingBracket.Add(op + lengthOfOperator);
// ending bracket should be after number or after inner function
// if there is internal function, then was replaced with number characters
indexesForEndingBracket.Add(
GetEndingIndexOfNumberOrStringInsideBracketOnIndex(tmpEquation, op + lengthOfOperator) + 1);
// replace actual function with number chars
tmpEquation = tmpEquation.Remove(op, lengthOfOperator).Insert(op,
StringControl.GenerateStringOfNumberCharacters(lengthOfOperator));
}
// sort indexes for adding brackets from the end
DecreasingComparer decreasingComparer = new DecreasingComparer();
indexesForStartingBracket.Sort(decreasingComparer);
indexesForEndingBracket.Sort(decreasingComparer);
// adding brackets
while (indexesForStartingBracket.Any() || indexesForEndingBracket.Any())
{
if (!indexesForEndingBracket.Any() || indexesForStartingBracket.First() > indexesForEndingBracket.First())
{
equation = equation.Insert(indexesForStartingBracket.First(), "(");
indexesForStartingBracket.Remove(indexesForStartingBracket.First());
}
else
{
equation = equation.Insert(indexesForEndingBracket.First(), ")");
indexesForEndingBracket.Remove(indexesForEndingBracket.First());
}
}
return(equation);
}
/// <summary>
/// Converts string tu number
/// </summary>
/// <param name="str">string containing number</param>
/// <param name="error">reference to ErrorsEnum which is set before throwing errors</param>
/// <returns>return number representing number in string or set error end throw exception if cant convert</returns>
public double StringToDouble(string str, ref ErrorsEnum error)
{
// check if is constant
switch (str)
{
case Strings.Pi:
return(Math.PI);
case Strings.Ans:
return(_ansValue);
case Strings.Memory:
return(_memoryValue);
}
// return Convert.ToDouble(str);
// or harder way :) (FloatSeparator can be changed to any char)
double number = 0;
double floatingPartOfNumber = 0;
int index = 0;
// convert integer part of number
while (str.Length > index && str[index] != StringControl.FloatSeparator)
{
StringControl.CheckIfIsDigit(str[index], ref error);
number *= 10;
number += str[index++] - '0';
}
// convert floating part of number
if (str.Length > index && str[index] == StringControl.FloatSeparator)
{
index = str.Length - 1;
while (str[index] != StringControl.FloatSeparator)
{
StringControl.CheckIfIsDigit(str[index], ref error);
floatingPartOfNumber /= 10;
floatingPartOfNumber += str[index--] - '0';
}
floatingPartOfNumber /= 10;
}
return(number + floatingPartOfNumber);
}
/// <summary>
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>returns number of missing ending brackets or -1 if invalid syntax</returns>
private int CheckBrackets(string equation)
{
// check if there is empty bracket
if (equation.Contains("()"))
{
_error = ErrorsEnum.EmptyBrackets;
return(-1);
}
// creating string consist only of brackets
string bracketsString = string.Empty;
int i = 0;
while (equation.Length > i)
{
while (equation.Length > i && (equation[i] == '(' || equation[i] == ')'))
{
bracketsString += equation[i++];
}
++i;
}
// deleting most internal brackets until there are no right ')' brackets
// or there is invalid sequence of brackets
while (bracketsString.Contains("()"))
{
bracketsString = StringControl.RemoveAll(bracketsString, "()");
}
// counting missing brackets
int missingBrackets = 0;
foreach (char bracket in bracketsString)
{
if (bracket != '(')
{
// there is invalid sequence of brackets
_error = ErrorsEnum.InvalidSequenceOfBrackets;
return(-1);
}
++missingBrackets;
}
return(missingBrackets);
}
/// <summary>
/// Will solve problem with minus before brackets and on another locations
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation</returns>
private static string FixMinusOperator(string equation)
{
// get all locations of minus char in equation
List <int> indexes = StringControl.GetAllIndexesOf(equation, Strings.Minus);
// check all minuses (must be checking from the end because of adding to equation string on index)
// add plus to equation if needed
for (int index = indexes.Count - 1; index >= 0; --index)
{
if (indexes[index] > 0 && !Operators.IsLastCharOfTwoArgumentsOperator(equation[indexes[index] - 1]))
{
equation = equation.Insert(indexes[index], Strings.Plus);
}
}
return(equation);
}
/// <summary>
/// Will move factorial operator before its argument for easier tree creating
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation</returns>
private string MoveFactorialOperatorForCreatingTree(string equation)
{
List <int> indexes = StringControl.GetAllIndexesOf(equation, Strings.Factorial);
//for (int index = indexes.Count - 1; index >= 0; --index)
// equation = equation.Remove(indexes[index], Strings.Factorial.length)
// .Insert(indexes[index], ")")
// .Insert(GetStartingIndexOfNumberOrStringInsideBracketOnIndex(equation, indexes[index] - 1), "(" + Strings.Factorial);
foreach (int index in indexes)
{
equation = equation.Remove(index, Strings.Factorial.Length);
equation = equation.Insert(GetStartingIndexOfNumberOrStringInsideBracketOnIndex(equation, index - 1),
Strings.Factorial);
}
return(equation);
}
/// <summary>
/// will simplify equation and add missing character
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation ready for creating tree</returns>
private string PrepareEquationForProcessing(string equation)
{
//equation = equation.ToLower();
//equation = AddMissingBrackets(equation);
//equation = SimplifyOperatorsInsideEquation(equation);
//equation = MoveFactorialOperatorForCreatingTree(equation);
//equation = FixFunctionInFunctionWithoutBracket(equation);
//equation = FixMinusBeforeBracket(equation);
//equation = FixMissingMultiplyOperator(equation);
return(FixMissingMultiplyOperator(
FixMinusOperator(
FixFunctionInFunctionWithoutBracket(
MoveFactorialOperatorForCreatingTree(
SimplifyOperatorsInsideEquation(
AddMissingBrackets(
AddMissingBrackets(
StringControl.RemoveSpaces(
equation.ToLower())))))))));
}
/// <summary>
/// </summary>
/// <param name="equation">string containing equation</param>
/// <param name="index">index of ending char of number or starting bracket</param>
/// <returns>ending index of number or ending index of corresponding bracket to given bracket</returns>
private int GetEndingIndexOfNumberOrStringInsideBracketOnIndex(string equation, int index)
{
int endingIndex = index;
if (equation[index] == '(')
{
// if there is bracket on index, return index of starting bracket
endingIndex = GetEndingBracketOfBracketOnIndex(equation, index);
}
else
{
// else check for staring index of number or constant
while (endingIndex < equation.Length &&
(StringControl.IsNumberChar(equation[endingIndex]) ||
StringControl.IsConstantChar(equation[endingIndex])))
{
++endingIndex;
}
--endingIndex;
}
if (index > endingIndex)
{
// if there if no number/ constant/ bracket
_error = ErrorsEnum.OperatorDoNotHaveEnoughArguments;
throw new SyntaxErrorException();
}
if (endingIndex == -1)
{
// shouldn't happened - fixed before solving tree
_error = ErrorsEnum.UnknownError;
throw new SyntaxErrorException();
}
return(endingIndex);
}
/// <summary>
/// Will show text in memory TextBox
/// </summary>
private void ShowMemory()
{
MemoryTextBox.Text = StringControl.DoubleToString(_calculator.GetMemory());
}
/// <summary>
/// Will show text in ans TextBox
/// </summary>
private void ShowAns()
{
AnsTextBox.Text = StringControl.DoubleToString(_calculator.GetAns());
}
/// <summary>
/// Will add missing ending bracket
/// </summary>
/// <param name="equation">string containing equation</param>
/// <returns>equation</returns>
private string AddMissingBrackets(string equation)
{
int count = CheckBrackets(equation);
return(count > 0 ? equation + StringControl.GenerateStringOfCharacters(count, ')') : equation);
}