/// <summary>
/// Evaluate as boolean
/// </summary>
internal override bool BoolEvaluate(ConditionEvaluationState state)
{
ProjectErrorUtilities.VerifyThrowInvalidProject
(LeftChild.CanBoolEvaluate(state),
state.conditionAttribute,
"ExpressionDoesNotEvaluateToBoolean",
LeftChild.GetUnexpandedValue(state),
LeftChild.GetExpandedValue(state),
state.parsedCondition);
if (LeftChild.BoolEvaluate(state))
{
// Short circuit
return true;
}
else
{
ProjectErrorUtilities.VerifyThrowInvalidProject
(RightChild.CanBoolEvaluate(state),
state.conditionAttribute,
"ExpressionDoesNotEvaluateToBoolean",
RightChild.GetUnexpandedValue(state),
RightChild.GetExpandedValue(state),
state.parsedCondition);
return RightChild.BoolEvaluate(state);
}
}
/// <summary>
/// Value after any item and property expressions are expanded
/// </summary>
/// <returns></returns>
internal override string GetExpandedValue(ConditionEvaluationState state)
{
if (cachedExpandedValue == null)
{
cachedExpandedValue = state.expanderToUse.ExpandAllIntoString(value, state.conditionAttribute);
}
return cachedExpandedValue;
}
/// <summary>
/// The main evaluate entry point for expression trees
/// </summary>
/// <param name="state"></param>
/// <returns></returns>
internal bool Evaluate(ConditionEvaluationState state)
{
ProjectErrorUtilities.VerifyThrowInvalidProject(
CanBoolEvaluate(state),
state.conditionAttribute,
"ConditionNotBooleanDetail",
state.parsedCondition,
GetExpandedValue(state));
return BoolEvaluate(state);
}
/// <summary>
/// Evaluates as boolean and evaluates children as boolean, numeric, or string.
/// Order in which comparisons are attempted is numeric, boolean, then string.
/// Updates conditioned properties table.
/// </summary>
internal override bool BoolEvaluate(ConditionEvaluationState state)
{
ProjectErrorUtilities.VerifyThrowInvalidProject
(LeftChild != null && RightChild != null,
state.conditionAttribute,
"IllFormedCondition",
state.parsedCondition);
if (LeftChild.CanNumericEvaluate(state) && RightChild.CanNumericEvaluate(state))
{
return Compare(LeftChild.NumericEvaluate(state), RightChild.NumericEvaluate(state));
}
else if (LeftChild.CanBoolEvaluate(state) && RightChild.CanBoolEvaluate(state))
{
return Compare(LeftChild.BoolEvaluate(state), RightChild.BoolEvaluate(state));
}
else // string comparison
{
string leftExpandedValue = LeftChild.GetExpandedValue(state);
string rightExpandedValue = RightChild.GetExpandedValue(state);
ProjectErrorUtilities.VerifyThrowInvalidProject
(leftExpandedValue != null && rightExpandedValue != null,
state.conditionAttribute,
"IllFormedCondition",
state.parsedCondition);
if (!conditionedPropertiesUpdated)
{
string leftUnexpandedValue = LeftChild.GetUnexpandedValue(state);
string rightUnexpandedValue = RightChild.GetUnexpandedValue(state);
if (leftUnexpandedValue != null)
{
Utilities.UpdateConditionedPropertiesTable
(state.conditionedPropertiesInProject,
leftUnexpandedValue,
rightExpandedValue);
}
if (rightUnexpandedValue != null)
{
Utilities.UpdateConditionedPropertiesTable
(state.conditionedPropertiesInProject,
rightUnexpandedValue,
leftExpandedValue);
}
conditionedPropertiesUpdated = true;
}
return Compare(leftExpandedValue, rightExpandedValue);
}
}
/// <summary>
/// Evaluate as boolean
/// </summary>
internal override bool BoolEvaluate(ConditionEvaluationState state)
{
ProjectErrorUtilities.VerifyThrowInvalidProject
(LeftChild.CanNumericEvaluate(state) && RightChild.CanNumericEvaluate(state),
state.conditionAttribute,
"ComparisonOnNonNumericExpression",
state.parsedCondition,
/* helpfully display unexpanded token and expanded result in error message */
(LeftChild.CanNumericEvaluate(state) ? RightChild.GetUnexpandedValue(state) : LeftChild.GetUnexpandedValue(state)),
(LeftChild.CanNumericEvaluate(state) ? RightChild.GetExpandedValue(state) : LeftChild.GetExpandedValue(state)));
return Compare(LeftChild.NumericEvaluate(state), RightChild.NumericEvaluate(state));
}
public void SimpleEvaluationTests()
{
Parser p = new Parser();
Expander expander = new Expander(new BuildPropertyGroup());
Hashtable conditionedProperties = null;
ConditionEvaluationState state = new ConditionEvaluationState(DummyAttribute, expander, conditionedProperties, string.Empty);
AssertParseEvaluate(p, "true", state, true);
AssertParseEvaluate(p, "on", state, true);
AssertParseEvaluate(p, "yes", state, true);
AssertParseEvaluate(p, "false", state, false);
AssertParseEvaluate(p, "off", state, false);
AssertParseEvaluate(p, "no", state, false);
}
/// <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;
}
internal override string GetExpandedValue(ConditionEvaluationState state)
{
return value;
}
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return(ConversionUtilities.CanConvertStringToBool(GetExpandedValue(state)));
}
/// <summary>
/// Value before any item and property expressions are expanded
/// </summary>
/// <returns></returns>
internal override string GetUnexpandedValue(ConditionEvaluationState state)
{
return(value);
}
/// <summary>
/// Value before any item and property expressions are expanded
/// </summary>
/// <returns></returns>
internal override string GetUnexpandedValue(ConditionEvaluationState state)
{
return null;
}
/// <summary>
/// Evaluate node as boolean
/// </summary>
internal override bool BoolEvaluate(ConditionEvaluationState state)
{
if (String.Equals(functionName, "exists", StringComparison.OrdinalIgnoreCase))
{
// 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.Equals(functionName, "HasTrailingSlash", StringComparison.OrdinalIgnoreCase))
{
// 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>
/// Returns expanded value with '!' prepended. Useful for error messages.
/// </summary>
internal override string GetExpandedValue(ConditionEvaluationState state)
{
return "!" + LeftChild.GetExpandedValue(state);
}
private void AssertParseEvaluateThrow(Parser p, string expression, ConditionEvaluationState state)
{
bool fExceptionCaught;
try
{
fExceptionCaught = false;
GenericExpressionNode tree = p.Parse(expression, DummyAttribute, ParserOptions.AllowAll);
state.parsedCondition = expression;
tree.Evaluate(state);
}
catch (InvalidProjectFileException e)
{
Console.WriteLine(e.BaseMessage);
fExceptionCaught = true;
}
Assertion.Assert(fExceptionCaught);
}
private bool EvaluateCondition(string conditionExpression, Expander expander)
{
Parser p = new Parser();
ConditionEvaluationState state = new ConditionEvaluationState(DummyAttribute, expander, null, conditionExpression);
GenericExpressionNode node = p.Parse(conditionExpression, DummyAttribute, ParserOptions.AllowAll);
bool result = node.Evaluate(state);
return result;
}
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return LeftChild.CanBoolEvaluate(state);
}
/// <summary>
/// Returns expanded value with '!' prepended. Useful for error messages.
/// </summary>
internal override string GetExpandedValue(ConditionEvaluationState state)
{
return("!" + LeftChild.GetExpandedValue(state));
}
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return(LeftChild.CanBoolEvaluate(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;
}
}
internal abstract bool CanNumericEvaluate(ConditionEvaluationState state);
internal abstract bool CanNumericEvaluate(ConditionEvaluationState state);
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return ConversionUtilities.CanConvertStringToBool(GetExpandedValue(state));
}
internal abstract bool BoolEvaluate(ConditionEvaluationState state);
/// <summary>
/// Whether boolean evaluation is allowed: always allowed for operators
/// </summary>
internal override bool CanBoolEvaluate(ConditionEvaluationState state)
{
return true;
}
internal abstract double NumericEvaluate(ConditionEvaluationState state);
/// <summary>
/// Check that the number of function arguments is correct.
/// </summary>
/// <param name="expected"></param>
private void VerifyArgumentCount(int expected, ConditionEvaluationState state)
{
ProjectErrorUtilities.VerifyThrowInvalidProject
(arguments.Count == expected,
state.conditionAttribute,
"IncorrectNumberOfFunctionArguments",
state.parsedCondition,
arguments.Count,
expected);
}
/// <summary> /// Value before any item and property expressions are expanded /// </summary> /// <returns></returns> internal abstract string GetUnexpandedValue(ConditionEvaluationState state);
/// <summary>
/// Evaluate as numeric
/// </summary>
internal override double NumericEvaluate(ConditionEvaluationState state)
{
return(ConversionUtilities.ConvertDecimalOrHexToDouble(GetExpandedValue(state)));
}
public void NegativeTests()
{
Parser p = new Parser();
Expander expander = new Expander(new BuildPropertyGroup());
Hashtable conditionedProperties = null;
ConditionEvaluationState state = new ConditionEvaluationState(DummyAttribute, expander, conditionedProperties, string.Empty);
AssertParseEvaluateThrow(p, "foobar", state);
AssertParseEvaluateThrow(p, "0", state);
AssertParseEvaluateThrow(p, "$(platform) == xx > 1==2", state);
AssertParseEvaluateThrow(p, "!0", state);
AssertParseEvaluateThrow(p, ">", state);
AssertParseEvaluateThrow(p, "true!=false==", state);
AssertParseEvaluateThrow(p, "()", state);
AssertParseEvaluateThrow(p, "!1", state);
AssertParseEvaluateThrow(p, "true!=false==true", state);
AssertParseEvaluateThrow(p, "'a'>'a'", state);
AssertParseEvaluateThrow(p, "=='x'", state);
AssertParseEvaluateThrow(p, "==", state);
AssertParseEvaluateThrow(p, "1==(2", state);
AssertParseEvaluateThrow(p, "'a'==('a'=='a')", state);
AssertParseEvaluateThrow(p, "true == on and ''", state);
AssertParseEvaluateThrow(p, "'' or 'true'", state);
}
internal override bool CanNumericEvaluate(ConditionEvaluationState state)
{
return(ConversionUtilities.ValidDecimalOrHexNumber(GetExpandedValue(state)));
}
/// <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>
/// 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 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);
}
/// <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);
}
internal abstract bool CanBoolEvaluate(ConditionEvaluationState state);
/// <summary>
/// Value after any item and property expressions are expanded
/// </summary>
/// <returns></returns>
internal override string GetExpandedValue(ConditionEvaluationState state)
{
return(null);
}
/// <summary>
/// Evaluate as numeric
/// </summary>
internal override double NumericEvaluate(ConditionEvaluationState state)
{
return ConversionUtilities.ConvertDecimalOrHexToDouble(GetExpandedValue(state));
}
public void NotTests()
{
Console.WriteLine("NegationParseTest()");
Parser p = new Parser();
Hashtable conditionedProperties = null;
BuildPropertyGroup propertyBag = new BuildPropertyGroup();
propertyBag.SetProperty("foo", "4");
propertyBag.SetProperty("bar", "32");
Expander expander = new Expander(propertyBag);
ConditionEvaluationState state = new ConditionEvaluationState(DummyAttribute, expander, conditionedProperties, string.Empty);
AssertParseEvaluate(p, "!true", state, false);
AssertParseEvaluate(p, "!(true)", state, false);
AssertParseEvaluate(p, "!($(foo) <= 5)", state, false);
AssertParseEvaluate(p, "!($(foo) <= 5 and $(bar) >= 15)", state, false);
}
internal override bool CanNumericEvaluate(ConditionEvaluationState state)
{
return ConversionUtilities.ValidDecimalOrHexNumber(GetExpandedValue(state));
}
/// <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>
/// 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;
}
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));
}
/// <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>
/// 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>
/// 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>
/// 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;
}
