/// <summary>
/// Returns a more human-readable string that represents the current calculation instance.
/// </summary>
/// <param name="option">The spacing option.</param>
/// <returns>
/// A string with better readability.
/// </returns>
/// <seealso cref="SpacingOption" />
public override string ToFormattedString(SpacingOption option = SpacingOption.None)
{
string operatorSign = null;
string spacing = "";
switch (option)
{
case SpacingOption.Thin:
spacing = " ";
break;
case SpacingOption.Thick:
spacing = " ";
break;
}
switch (Operator)
{
case Operator.Add:
operatorSign = $"{spacing}+{spacing}";
break;
case Operator.Sub:
operatorSign = $"{spacing}-{spacing}";
break;
case Operator.Mul:
operatorSign = $"{spacing}×{spacing}";
break;
case Operator.Div:
operatorSign = $"{spacing}÷{spacing}";
break;
}
if (Left is CompositeCalculation &&
!(Right is CompositeCalculation) &&
OperatorPrecedence((Left as CompositeCalculation).Operator) < OperatorPrecedence(this.Operator))
{
return($"({Left.ToFormattedString(option)}){operatorSign}{Right.ToFormattedString(option)}");
}
if (!(Left is CompositeCalculation) &&
Right is CompositeCalculation &&
OperatorPrecedence((Right as CompositeCalculation).Operator) < OperatorPrecedence(this.Operator))
{
return($"{Left.ToFormattedString(option)}{operatorSign}({Right.ToFormattedString(option)})");
}
if (Left is CompositeCalculation && Right is CompositeCalculation)
{
return($"({Left.ToFormattedString(option)}){operatorSign}({Right.ToFormattedString(option)})");
}
return($"{Left.ToFormattedString(option)}{operatorSign}{Right.ToFormattedString(option)}");
}
/// <summary>
/// Initializes a new instance of the <see cref="QuestionGenerator{T}"/> class.
/// </summary>
/// <param name="placeHolder">The place holder of the question where the students should put the answer in.</param>
/// <param name="spacingOption">The <see cref="SpacingOption"/> value which indicates the spacing options of the generated question.</param>
protected QuestionGenerator(string placeHolder, SpacingOption spacingOption)
{
this.placeHolder = placeHolder;
this.spacingOption = spacingOption;
}
/// <summary> /// Returns a more human-readable string that represents the current calculation instance. /// </summary> /// <param name="option">The spacing option.</param> /// <returns>A string with better readability.</returns> /// <seealso cref="SpacingOption"/> public override string ToFormattedString(SpacingOption option = SpacingOption.None) => this.Value.ToString();
/// <summary>
/// Initializes a new instance of the <see cref="ClozeQuestionGenerator"/> class.
/// </summary>
/// <param name="placeHolder">The place holder of the question where the students should put the answer in.</param>
/// <param name="spacingOption">The <see cref="SpacingOption"/> value which indicates the spacing options of the generated question.</param>
public ClozeQuestionGenerator(string placeHolder = "（ ）", SpacingOption spacingOption = SpacingOption.Thin) : base(placeHolder, spacingOption)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="RegularQuestionGenerator"/> class.
/// </summary>
/// <param name="placeHolder">The place holder of the question where the students should put the answer in.</param>
/// <param name="spacingOption">The <see cref="P:CalculateIt2.Engine.Generation.QuestionGenerator`1.SpacingOption" /> value which indicates the spacing options of the generated question.</param>
public RegularQuestionGenerator(string placeHolder = "____", SpacingOption spacingOption = SpacingOption.Thin)
: base(placeHolder, spacingOption)
{
}
/// <summary> /// Returns a more human-readable string that represents the current calculation instance. /// </summary> /// <param name="option">The spacing option.</param> /// <returns>A string with better readability.</returns> /// <seealso cref="SpacingOption"/> public abstract string ToFormattedString(SpacingOption option = SpacingOption.None);
/// <summary>
/// Initializes a new instance of the <see cref="ComparisonQuestionGenerator"/> class.
/// </summary>
/// <param name="threshold">The threshold.</param>
/// <param name="placeHolder">The place holder.</param>
/// <param name="spacingOption">The spacing option.</param>
public ComparisonQuestionGenerator(int threshold, string placeHolder = "\u25CB", SpacingOption spacingOption = SpacingOption.Thin)
: base(placeHolder, spacingOption)
{
this.threshold = threshold;
}
