internal override bool CanNumericEvaluate(ConditionEvaluationState state)
{
// It is not always possible to numerically evaluate even a numerical expression -
// for example, it may overflow a double. So check here.
return(ConversionUtilities.ValidDecimalOrHexNumber(value));
}
internal override string GetExpandedValue(ConditionEvaluationState state)
{
return(value);
}
/// <summary>
/// Evaluate as numeric
/// </summary>
internal override double NumericEvaluate(ConditionEvaluationState state)
{
return(ConversionUtilities.ConvertDecimalOrHexToDouble(value));
}
/// <summary>
/// Whether it can be evaluated as a boolean: never allowed for numerics
/// </summary>
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
// Numeric expressions are never allowed to be treated as booleans.
return(false);
}
/// <summary>
/// Value before any item and property expressions are expanded
/// </summary>
/// <returns></returns>
internal override string GetUnexpandedValue(ConditionEvaluationState state)
{
return(null);
}
/// <summary>
/// Evaluate as boolean
/// </summary>
internal override bool BoolEvaluate(ConditionEvaluationState state)
{
// Should be unreachable: all calls check CanBoolEvaluate() first
ErrorUtilities.VerifyThrow(false, "Can't evaluate a numeric expression as boolean.");
return(false);
}
/// <summary>
/// Whether boolean evaluation is allowed: always allowed for operators
/// </summary>
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return(true);
}
internal abstract bool BoolEvaluate(ConditionEvaluationState state);
/// <summary>
/// Evaluate node as boolean
/// </summary>
internal override bool BoolEvaluate(ConditionEvaluationState state)
{
if (String.Compare(functionName, "exists", StringComparison.OrdinalIgnoreCase) == 0)
{
// Check we only have one argument
VerifyArgumentCount(1, state);
// Expand properties and items, and verify the result is an appropriate scalar
string expandedValue = ExpandArgumentForScalarParameter("exists", (GenericExpressionNode)arguments[0], state);
if (Project.PerThreadProjectDirectory != null && !String.IsNullOrEmpty(expandedValue))
{
try
{
expandedValue = Path.GetFullPath(Path.Combine(Project.PerThreadProjectDirectory, expandedValue));
}
catch (Exception e) // Catching Exception, but rethrowing unless it's an IO related exception.
{
if (ExceptionHandling.NotExpectedException(e))
{
throw;
}
// Ignore invalid characters or path related exceptions
// We will ignore the PathTooLong exception caused by GetFullPath becasue in single proc this code
// is not executed and the condition is just evaluated to false as File.Exists and Directory.Exists does not throw in this situation.
// To be consistant with that we will return a false in this case also.
// DevDiv Bugs: 46035
return(false);
}
}
// Both Exists functions return false if the value is null or empty
return(File.Exists(expandedValue) || Directory.Exists(expandedValue));
}
else if (String.Compare(functionName, "HasTrailingSlash", StringComparison.OrdinalIgnoreCase) == 0)
{
// Check we only have one argument
VerifyArgumentCount(1, state);
// Expand properties and items, and verify the result is an appropriate scalar
string expandedValue = ExpandArgumentForScalarParameter("HasTrailingSlash", (GenericExpressionNode)arguments[0], state);
// Is the last character a backslash?
if (expandedValue.Length != 0)
{
char lastCharacter = expandedValue[expandedValue.Length - 1];
// Either back or forward slashes satisfy the function: this is useful for URL's
return(lastCharacter == Path.DirectorySeparatorChar || lastCharacter == Path.AltDirectorySeparatorChar);
}
else
{
return(false);
}
}
// We haven't implemented any other "functions"
else
{
ProjectErrorUtilities.VerifyThrowInvalidProject(
false,
state.conditionAttribute,
"UndefinedFunctionCall",
state.parsedCondition,
this.functionName);
return(false);
}
}
/// <summary>
/// Numeric evaluation is never allowed for operators
/// </summary>
internal override double NumericEvaluate(ConditionEvaluationState state)
{
// Should be unreachable: all calls check CanNumericEvaluate() first
ErrorUtilities.VerifyThrow(false, "Cannot numeric evaluate an operator");
return(0.0D);
}
/// <summary>
/// Expands properties and items in the argument, and verifies that the result is consistent
/// with a scalar parameter type.
/// </summary>
/// <param name="function">Function name for errors</param>
/// <param name="argumentNode">Argument to be expanded</param>
/// <returns>Scalar result</returns>
/// <owner>danmose</owner>
private string ExpandArgumentForScalarParameter(string function, GenericExpressionNode argumentNode, ConditionEvaluationState state)
{
string argument = argumentNode.GetUnexpandedValue(state);
List <TaskItem> items = state.expanderToUse.ExpandAllIntoTaskItems(argument, state.conditionAttribute);
string expandedValue = String.Empty;
if (items.Count == 0)
{
// Empty argument, that's fine.
}
else if (items.Count == 1)
{
expandedValue = items[0].ItemSpec;
}
else // too many items for the function
{
// We only allow a single item to be passed into a scalar parameter.
ProjectErrorUtilities.VerifyThrowInvalidProject(false,
state.conditionAttribute,
"CannotPassMultipleItemsIntoScalarFunction", function, argument,
state.expanderToUse.ExpandAllIntoString(argument, state.conditionAttribute));
}
return(expandedValue);
}
/// <summary> /// Value before any item and property expressions are expanded /// </summary> /// <returns></returns> internal abstract string GetUnexpandedValue(ConditionEvaluationState state);
internal abstract double NumericEvaluate(ConditionEvaluationState state);
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return(LeftChild.CanBoolEvaluate(state));
}
/// <summary>
/// Whether the node can be evaluated as a numeric: by default,
/// this is not allowed
/// </summary>
internal override bool CanNumericEvaluate(ConditionEvaluationState state)
{
return(false);
}
/// <summary>
/// Returns expanded value with '!' prepended. Useful for error messages.
/// </summary>
internal override string GetExpandedValue(ConditionEvaluationState state)
{
return("!" + LeftChild.GetExpandedValue(state));
}
internal abstract bool CanNumericEvaluate(ConditionEvaluationState state);
