/// <summary>
/// Checks that parenthesis are used correctly within a conditional logical expression.
/// </summary>
/// <param name="element">
/// The parent element.
/// </param>
/// <param name="expression">
/// The expression to check.
/// </param>
private void CheckConditionalLogicalExpressionParenthesis(CsElement element, ConditionalLogicalExpression expression)
{
Param.AssertNotNull(element, "element");
Param.AssertNotNull(expression, "expression");
if (expression.LeftHandSide.ExpressionType == ExpressionType.ConditionalLogical)
{
if (!this.CheckConditionalLogicalParenthesisForExpressionAndChild(element, expression, (ConditionalLogicalExpression)expression.LeftHandSide))
{
return;
}
}
if (expression.RightHandSide.ExpressionType == ExpressionType.ConditionalLogical)
{
this.CheckConditionalLogicalParenthesisForExpressionAndChild(element, expression, (ConditionalLogicalExpression)expression.RightHandSide);
}
}
/// <summary>
/// Checks whether parenthesis are needed within the conditional logical expressions.
/// </summary>
/// <param name="element">
/// The parent element.
/// </param>
/// <param name="expression">
/// The parent conditional logical expression.
/// </param>
/// <param name="childExpression">
/// The child conditional logical expression.
/// </param>
/// <returns>
/// Returns true if there is no violation, or false if there is a violation.
/// </returns>
private bool CheckConditionalLogicalParenthesisForExpressionAndChild(
CsElement element, ConditionalLogicalExpression expression, ConditionalLogicalExpression childExpression)
{
Param.AssertNotNull(element, "element");
Param.AssertNotNull(expression, "expression");
Param.AssertNotNull(childExpression, "childExpression");
// If the two expressions are both of the same type (OR or AND), then there is
// no need for parenthesis.
if (expression.OperatorType != childExpression.OperatorType)
{
// The expressions are not of the same type. One of them should be enclosed
// by parenthesis to indicate the precedence.
this.AddViolation(element, expression.LineNumber, Rules.ConditionalExpressionsMustDeclarePrecedence);
return false;
}
return true;
}
/// <summary>
/// Reads a conditional logical expression.
/// </summary>
/// <param name="leftHandSide">
/// The expression on the left hand side of the operator.
/// </param>
/// <param name="previousPrecedence">
/// The precedence of the expression just before this one.
/// </param>
/// <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 ConditionalLogicalExpression GetConditionalLogicalExpression(
Expression leftHandSide, ExpressionPrecedence previousPrecedence, Reference<ICodePart> parentReference, bool unsafeCode)
{
Param.AssertNotNull(leftHandSide, "leftHandSide");
Param.Ignore(previousPrecedence);
Param.AssertNotNull(parentReference, "parentReference");
Param.Ignore(unsafeCode);
ConditionalLogicalExpression expression = null;
Reference<ICodePart> expressionReference = new Reference<ICodePart>();
// Read the details of the expression.
OperatorSymbol operatorToken = this.PeekOperatorToken(parentReference, expressionReference);
Debug.Assert(operatorToken.Category == OperatorCategory.Logical, "Expected a logical operator");
// Check the precedence of the operators to make sure we can gather this statement now.
ExpressionPrecedence precedence = GetOperatorPrecedence(operatorToken.SymbolType);
if (CheckPrecedence(previousPrecedence, precedence))
{
// Add the operator token to the document and advance the symbol manager up to it.
this.symbols.Advance();
this.tokens.Add(operatorToken);
// Get the expression on the right-hand side of the operator.
Expression rightHandSide = this.GetOperatorRightHandExpression(precedence, expressionReference, unsafeCode);
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
// Get the expression operator type.
ConditionalLogicalExpression.Operator type;
switch (operatorToken.SymbolType)
{
case OperatorType.ConditionalAnd:
type = ConditionalLogicalExpression.Operator.And;
break;
case OperatorType.ConditionalOr:
type = ConditionalLogicalExpression.Operator.Or;
break;
default:
Debug.Fail("Unexpected operator type");
throw new InvalidOperationException();
}
// Create and return the expression.
expression = new ConditionalLogicalExpression(partialTokens, type, leftHandSide, rightHandSide);
expressionReference.Target = expression;
}
return expression;
}
/// <summary>
/// Reads a conditional logical expression.
/// </summary>
/// <param name="sourceCode">
/// The source code containing the expression.
/// </param>
/// <param name="parentReference">
/// The parent code unit.
/// </param>
/// <param name="leftHandSide">
/// The expression on the left hand side of the operator.
/// </param>
/// <param name="previousPrecedence">
/// The precedence of the expression just before this one.
/// </param>
/// <returns>
/// Returns the expression.
/// </returns>
private ConditionalLogicalExpression GetConditionalPreprocessorAndOrExpression(
SourceCode sourceCode, Reference<ICodePart> parentReference, Expression leftHandSide, ExpressionPrecedence previousPrecedence)
{
Param.AssertNotNull(sourceCode, "sourceCode");
Param.AssertNotNull(parentReference, "parentReference");
Param.AssertNotNull(leftHandSide, "leftHandSide");
Param.Ignore(previousPrecedence);
ConditionalLogicalExpression expression = null;
this.AdvanceToNextConditionalDirectiveCodeSymbol(parentReference);
Symbol firstSymbol = this.symbols.Peek(1);
if (firstSymbol == null)
{
throw new SyntaxException(sourceCode, firstSymbol.LineNumber);
}
Reference<ICodePart> expressionReference = new Reference<ICodePart>();
// Create the operator symbol.
OperatorType type;
OperatorCategory category;
GetOperatorType(firstSymbol, out type, out category);
OperatorSymbol operatorToken = new OperatorSymbol(firstSymbol.Text, category, type, firstSymbol.Location, expressionReference, this.symbols.Generated);
// Check the precedence of the operators to make sure we can gather this statement now.
ExpressionPrecedence precedence = GetOperatorPrecedence(operatorToken.SymbolType);
if (CheckPrecedence(previousPrecedence, precedence))
{
// Add the operator token to the document and advance the symbol manager up to it.
this.symbols.Advance();
this.tokens.Add(operatorToken);
// Get the expression on the right-hand side of the operator.
Expression rightHandSide = this.GetNextConditionalPreprocessorExpression(sourceCode, precedence);
if (rightHandSide == null)
{
throw new SyntaxException(sourceCode, operatorToken.LineNumber);
}
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
// Get the expression operator type.
ConditionalLogicalExpression.Operator conditionalType;
switch (operatorToken.SymbolType)
{
case OperatorType.ConditionalAnd:
conditionalType = ConditionalLogicalExpression.Operator.And;
break;
case OperatorType.ConditionalOr:
conditionalType = ConditionalLogicalExpression.Operator.Or;
break;
default:
throw new SyntaxException(sourceCode, operatorToken.LineNumber);
}
// Create and return the expression.
expression = new ConditionalLogicalExpression(partialTokens, conditionalType, leftHandSide, rightHandSide);
}
return expression;
}
/// <summary>
/// Reads a conditional logical expression.
/// </summary>
/// <param name="sourceCode">
/// The source code containing the expression.
/// </param>
/// <param name="parentReference">
/// The parent code unit.
/// </param>
/// <param name="leftHandSide">
/// The expression on the left hand side of the operator.
/// </param>
/// <param name="previousPrecedence">
/// The precedence of the expression just before this one.
/// </param>
/// <returns>
/// Returns the expression.
/// </returns>
private ConditionalLogicalExpression GetConditionalPreprocessorAndOrExpression(
SourceCode sourceCode, Reference <ICodePart> parentReference, Expression leftHandSide, ExpressionPrecedence previousPrecedence)
{
Param.AssertNotNull(sourceCode, "sourceCode");
Param.AssertNotNull(parentReference, "parentReference");
Param.AssertNotNull(leftHandSide, "leftHandSide");
Param.Ignore(previousPrecedence);
ConditionalLogicalExpression expression = null;
this.AdvanceToNextConditionalDirectiveCodeSymbol(parentReference);
Symbol firstSymbol = this.symbols.Peek(1);
if (firstSymbol == null)
{
throw new SyntaxException(sourceCode, firstSymbol.LineNumber);
}
Reference <ICodePart> expressionReference = new Reference <ICodePart>();
// Create the operator symbol.
OperatorType type;
OperatorCategory category;
GetOperatorType(firstSymbol, out type, out category);
OperatorSymbol operatorToken = new OperatorSymbol(firstSymbol.Text, category, type, firstSymbol.Location, expressionReference, this.symbols.Generated);
// Check the precedence of the operators to make sure we can gather this statement now.
ExpressionPrecedence precedence = GetOperatorPrecedence(operatorToken.SymbolType);
if (CheckPrecedence(previousPrecedence, precedence))
{
// Add the operator token to the document and advance the symbol manager up to it.
this.symbols.Advance();
this.tokens.Add(operatorToken);
// Get the expression on the right-hand side of the operator.
Expression rightHandSide = this.GetNextConditionalPreprocessorExpression(sourceCode, precedence);
if (rightHandSide == null)
{
throw new SyntaxException(sourceCode, operatorToken.LineNumber);
}
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
// Get the expression operator type.
ConditionalLogicalExpression.Operator conditionalType;
switch (operatorToken.SymbolType)
{
case OperatorType.ConditionalAnd:
conditionalType = ConditionalLogicalExpression.Operator.And;
break;
case OperatorType.ConditionalOr:
conditionalType = ConditionalLogicalExpression.Operator.Or;
break;
default:
throw new SyntaxException(sourceCode, operatorToken.LineNumber);
}
// Create and return the expression.
expression = new ConditionalLogicalExpression(partialTokens, conditionalType, leftHandSide, rightHandSide);
}
return(expression);
}
/// <summary>
/// The save.
/// </summary>
/// <param name="operator">
/// The operator.
/// </param>
private void Save(ConditionalLogicalExpression.Operator @operator)
{
var operatorString = string.Empty;
switch (@operator)
{
case ConditionalLogicalExpression.Operator.And:
operatorString = "&&";
break;
case ConditionalLogicalExpression.Operator.Or:
operatorString = "||";
break;
default:
break;
}
this.cppWriter.Write(' ');
this.cppWriter.Write(operatorString);
this.cppWriter.Write(' ');
}
/// <summary>
/// The save.
/// </summary>
/// <param name="conditionalLogicalExpression">
/// The conditional logical expression.
/// </param>
private void Save(ConditionalLogicalExpression conditionalLogicalExpression)
{
@switch(conditionalLogicalExpression.LeftHandSide);
this.Save(conditionalLogicalExpression.OperatorType);
@switch(conditionalLogicalExpression.RightHandSide);
}