/// <summary>
/// Reads a unary expression.
/// </summary>
/// <param name="parentReference">
/// The parent code part.
/// </param>
/// <param name="unsafeCode">
/// Indicates whether the code being parsed resides in an unsafe code block.
/// </param>
/// <returns>
/// Returns the expression.
/// </returns>
private UnaryExpression GetUnaryExpression(Reference<ICodePart> parentReference, bool unsafeCode)
{
Param.AssertNotNull(parentReference, "parentReference");
Param.Ignore(unsafeCode);
Reference<ICodePart> expressionReference = new Reference<ICodePart>();
// Create the token based on the type of the symbol.
Symbol symbol = this.GetNextSymbol(parentReference);
OperatorSymbol token;
UnaryExpression.Operator operatorType;
if (symbol.SymbolType == SymbolType.Plus)
{
operatorType = UnaryExpression.Operator.Positive;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Positive, symbol.Location, expressionReference, this.symbols.Generated);
}
else if (symbol.SymbolType == SymbolType.Minus)
{
operatorType = UnaryExpression.Operator.Negative;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Negative, symbol.Location, expressionReference, this.symbols.Generated);
}
else if (symbol.SymbolType == SymbolType.Not)
{
operatorType = UnaryExpression.Operator.Not;
token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Not, symbol.Location, expressionReference, this.symbols.Generated);
}
else if (symbol.SymbolType == SymbolType.Tilde)
{
operatorType = UnaryExpression.Operator.BitwiseCompliment;
token = new OperatorSymbol(
symbol.Text, OperatorCategory.Unary, OperatorType.BitwiseCompliment, symbol.Location, expressionReference, this.symbols.Generated);
}
else
{
// This is not a unary type.
Debug.Fail("Unexpected operator type");
throw new StyleCopException();
}
Node<CsToken> tokenNode = this.tokens.InsertLast(token);
this.symbols.Advance();
// Get the expression after the operator.
Expression innerExpression = this.GetNextExpression(ExpressionPrecedence.Unary, expressionReference, unsafeCode);
if (innerExpression == null || innerExpression.Tokens.First == null)
{
throw this.CreateSyntaxException();
}
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, tokenNode, this.tokens.Last);
// Create and return the expression.
UnaryExpression expression = new UnaryExpression(partialTokens, operatorType, innerExpression);
expressionReference.Target = expression;
return expression;
}
/// <summary>
/// The save.
/// </summary>
/// <param name="operator">
/// The operator.
/// </param>
private void Save(UnaryExpression.Operator @operator)
{
var operatorString = string.Empty;
switch (@operator)
{
case UnaryExpression.Operator.BitwiseCompliment:
operatorString = "~";
break;
case UnaryExpression.Operator.Negative:
operatorString = "-";
break;
case UnaryExpression.Operator.Not:
operatorString = "!";
break;
case UnaryExpression.Operator.Positive:
operatorString = "+";
break;
default:
break;
}
this.cppWriter.Write(operatorString);
}
/// <summary>
/// Reads a NOT expression.
/// </summary>
/// <param name="sourceCode">
/// The source code containing the expression.
/// </param>
/// <param name="parentReference">
/// The parent code part.
/// </param>
/// <returns>
/// Returns the expression.
/// </returns>
private UnaryExpression GetConditionalPreprocessorNotExpression(SourceCode sourceCode, Reference<ICodePart> parentReference)
{
Param.AssertNotNull(sourceCode, "sourceCode");
Param.AssertNotNull(parentReference, "parentReference");
Reference<ICodePart> expressionReference = new Reference<ICodePart>();
// Get the symbol.
this.AdvanceToNextConditionalDirectiveCodeSymbol(parentReference);
Symbol symbol = this.symbols.Peek(1);
Debug.Assert(symbol != null, "The next symbol should not be null");
// Create the token based on the type of the symbol.
OperatorSymbol token = new OperatorSymbol(symbol.Text, OperatorCategory.Unary, OperatorType.Not, symbol.Location, expressionReference, this.symbols.Generated);
Node<CsToken> tokenNode = this.tokens.InsertLast(token);
// Advance up to the symbol and add it to the document.
this.symbols.Advance();
// Get the expression after the operator.
Expression innerExpression = this.GetNextConditionalPreprocessorExpression(sourceCode, ExpressionPrecedence.Unary);
if (innerExpression == null || innerExpression.Tokens.First == null)
{
throw new SyntaxException(sourceCode, symbol.LineNumber);
}
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, tokenNode, this.tokens.Last);
// Create and return the expression.
UnaryExpression expression = new UnaryExpression(partialTokens, UnaryExpression.Operator.Not, innerExpression);
expressionReference.Target = expression;
return expression;
}
/// <summary>
/// The save.
/// </summary>
/// <param name="unaryExpression">
/// The unary expression.
/// </param>
private void Save(UnaryExpression unaryExpression)
{
this.Save(unaryExpression.OperatorType);
@switch(unaryExpression.Value);
}
