/// <summary>
/// Fixes the error.
/// </summary>
/// <param name="violationContext">Context for the violation.</param>
/// <param name="token">The token that is missing a prefix.</param>
private void FixPrefixLocalCallsWithThisViolation(ViolationContext violationContext, Token token)
{
Param.Ignore(violationContext);
Param.AssertNotNull(token, "token");
CsDocument document = token.Document;
// Find the item that is going to get replaced.
CodeUnit itemToReplace = token;
LiteralExpression parent = token.Parent as LiteralExpression;
if (parent != null)
{
itemToReplace = parent;
}
// Record the location of this item.
CodeUnitLocationMarker marker = document.GetCodeUnitLocationMarker(itemToReplace);
// If the token is not already wrapped by a literal expression, create one.
LiteralExpression rightHandSide = parent;
if (rightHandSide == null)
{
rightHandSide = document.CreateLiteralExpression(token);
}
// Create the left-hand side and the expression.
LiteralExpression leftHandSide = document.CreateLiteralExpression(document.CreateThisToken());
MemberAccessExpression expression = document.CreateMemberAccessExpression(leftHandSide, rightHandSide);
// Insert the member access expression in the same location as the previous literal.
document.Insert(expression, marker);
}
/// <summary>
/// Checks a string to determine whether it is using an incorrect empty string notation.
/// </summary>
/// <param name="text">The string to check.</param>
/// <param name="parentElement">The parent element.</param>
private void CheckEmptyString(Token text, Element parentElement)
{
Param.AssertNotNull(text, "text");
Param.AssertNotNull(parentElement, "parentElement");
Debug.Assert(text.TokenType == TokenType.String, "The token must be a string.");
if (string.Equals(text.Text, "\"\"", StringComparison.Ordinal) ||
string.Equals(text.Text, "@\"\"", StringComparison.Ordinal))
{
// Look at the previous token. If it is the 'case' keyword, then do not throw this
// exception. It is illegal to write case: String.Empty and instead case: "" must be written.
Token previousToken = text.FindPreviousToken();
if (previousToken == null || (previousToken.TokenType != TokenType.Case && !IsConstVariableDeclaration(previousToken)))
{
this.Violation(
Rules.UseStringEmptyForEmptyStrings,
new ViolationContext(parentElement, text.LineNumber),
(c, o) =>
{
// Fix the violation.
CsDocument document = text.Document;
// Create a member access expression which represents "string.Empty".
var stringEmpty = document.CreateMemberAccessExpression(document.CreateLiteralExpression("string"), document.CreateLiteralExpression("Empty"));
// The parent of the token should be a literal expression.
if (text.Parent != null && text.Parent.Is(ExpressionType.Literal))
{
document.Replace(text.Parent, stringEmpty);
}
else
{
Debug.Fail("Unhandled situation");
}
});
}
}
}
