/// <summary>
/// Reads a conditional 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="unsafeCode">Indicates whether the code being parsed resides in an unsafe code block.</param>
/// <returns>Returns the expression.</returns>
private ConditionalExpression GetConditionalExpression(
Expression leftHandSide, ExpressionPrecedence previousPrecedence, bool unsafeCode)
{
Param.AssertNotNull(leftHandSide, "leftHandSide");
Param.Ignore(unsafeCode);
Param.Ignore(previousPrecedence);
ConditionalExpression expression = null;
if (CheckPrecedence(previousPrecedence, ExpressionPrecedence.Conditional))
{
var expressionReference = new Reference<ICodePart>();
// Get the first operator.
this.tokens.Add(this.GetOperatorToken(OperatorType.ConditionalQuestionMark, expressionReference));
// Get the expression on the right-hand side of the operator.
Expression trueValue = this.GetOperatorRightHandExpression(ExpressionPrecedence.Conditional, expressionReference, unsafeCode);
// Get the next operator and make sure it is the correct type.
this.tokens.Add(this.GetOperatorToken(OperatorType.ConditionalColon, expressionReference));
// Get the expression on the right-hand side of the operator.
Expression falseValue = this.GetOperatorRightHandExpression(ExpressionPrecedence.None, expressionReference, unsafeCode);
// Create the partial token list for the expression.
CsTokenList partialTokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
// Create and return the expression.
expression = new ConditionalExpression(partialTokens, leftHandSide, trueValue, falseValue);
expressionReference.Target = expression;
}
return expression;
}
private ConditionalExpression GetConditionalExpression(Expression leftHandSide, ExpressionPrecedence previousPrecedence, bool unsafeCode)
{
ConditionalExpression expression = null;
if (CheckPrecedence(previousPrecedence, ExpressionPrecedence.Conditional))
{
this.tokens.Add(this.GetOperatorToken(OperatorType.ConditionalQuestionMark));
Expression operatorRightHandExpression = this.GetOperatorRightHandExpression(ExpressionPrecedence.Conditional, unsafeCode);
this.tokens.Add(this.GetOperatorToken(OperatorType.ConditionalColon));
Expression falseValue = this.GetOperatorRightHandExpression(ExpressionPrecedence.None, unsafeCode);
CsTokenList tokens = new CsTokenList(this.tokens, leftHandSide.Tokens.First, this.tokens.Last);
expression = new ConditionalExpression(tokens, leftHandSide, operatorRightHandExpression, falseValue);
}
return expression;
}
