private static SolutionAnalysis Analyze(LeapSolution leapSolution)
{
if (leapSolution.UsesTooManyChecks())
{
return(leapSolution.DisapproveWithComment(LeapComments.UseMinimumNumberOfChecks));
}
if (leapSolution.ReturnsMinimumNumberOfChecksInSingleExpression())
{
return(leapSolution.UsesExpressionBody()
? leapSolution.ApproveAsOptimal()
: leapSolution.ApproveWithComment(SharedComments.UseExpressionBodiedMember));
}
return(leapSolution.ReferToMentor());
}
private static bool BinaryExpressionUsesYearParameter(this LeapSolution leapSolution, BinaryExpressionSyntax binaryExpression) =>
binaryExpression.Left.IsEquivalentWhenNormalized(
LeapParameterIdentifierName(leapSolution)) ||
binaryExpression.Right.IsEquivalentWhenNormalized(
LeapParameterIdentifierName(leapSolution));
public static bool UsesTooManyChecks(this LeapSolution leapSolution) => leapSolution.IsLeapYearMethod .DescendantNodes() .OfType <BinaryExpressionSyntax>() .Count(leapSolution.BinaryExpressionUsesYearParameter) > MinimalNumberOfChecks;
public static bool UsesExpressionBody(this LeapSolution leapSolution) => leapSolution.IsLeapYearMethod.IsExpressionBody();
public static bool ReturnsMinimumNumberOfChecksInSingleExpression(this LeapSolution leapSolution) => leapSolution.Returns(LeapMinimumNumberOfChecksWithoutParenthesesBinaryExpression(leapSolution)) || leapSolution.Returns(LeapMinimumNumberOfChecksWithParenthesesBinaryExpression(leapSolution));
private static BinaryExpressionSyntax LeapModuloExpression(LeapSolution leapSolution, int number) =>
ModuloExpression(
LeapParameterIdentifierName(leapSolution),
NumericLiteralExpression(number));
public static IdentifierNameSyntax LeapParameterIdentifierName(LeapSolution leapSolution) => IdentifierName(leapSolution.YearParameter.Identifier);
public static BinaryExpressionSyntax LeapMinimumNumberOfChecksWithParenthesesBinaryExpression(LeapSolution leapSolution) =>
LogicalAndExpression(
EqualsExpression(
LeapModuloExpression(leapSolution, 4),
NumericLiteralExpression(0)),
ParenthesizedExpression(
LogicalOrExpression(
NotEqualsExpression(
LeapModuloExpression(leapSolution, 100),
NumericLiteralExpression(0)),
EqualsExpression(
LeapModuloExpression(leapSolution, 400),
NumericLiteralExpression(0)))));
private static BinaryExpressionSyntax LeapYearModuloExpression(LeapSolution solution, int year) =>
ModuloExpression(
LeapParameterIdentifierName(solution),
NumericLiteralExpression(year));
private static BinaryExpressionSyntax DivisibleByFourHundred(LeapSolution solution) =>
EqualsExpression(
LeapYearModuloExpression(solution, 400),
NumericLiteralExpression(0));
public static BinaryExpressionSyntax LeapMinimumNumberOfChecksWithParenthesesBinaryExpression(LeapSolution solution) =>
LogicalAndExpression(
DivisibleByFour(solution),
ParenthesizedExpression(
LogicalOrExpression(
NotDivisibleByHundred(solution),
DivisibleByFourHundred(solution))));
public static IdentifierNameSyntax LeapParameterIdentifierName(LeapSolution solution) => IdentifierName(solution.YearParameterName);