| static private VariableMustNotBeByRef ( object p0, object p1, string paramName ) : Exception | ||
| p0 | object | |
| p1 | object | |
| paramName | string | |
| return | Exception | |
// Checks that all variables are non-null, not byref, and unique.
internal static void ValidateVariables(ReadOnlyCollection <ParameterExpression> varList, string collectionName)
{
if (varList.Count == 0)
{
return;
}
int count = varList.Count;
var set = new Set <ParameterExpression>(count);
for (int i = 0; i < count; i++)
{
ParameterExpression v = varList[i];
if (v == null)
{
throw new ArgumentNullException(string.Format(System.Globalization.CultureInfo.CurrentCulture, "{0}[{1}]", collectionName, set.Count));
}
if (v.IsByRef)
{
throw Error.VariableMustNotBeByRef(v, v.Type);
}
if (set.Contains(v))
{
throw Error.DuplicateVariable(v);
}
set.Add(v);
}
}
/// <summary>
/// Creates a <see cref="CatchBlock"/> representing a catch statement with the specified elements.
/// </summary>
/// <param name="type">The <see cref="Type"/> of <see cref="Exception"/> this <see cref="CatchBlock"/> will handle.</param>
/// <param name="variable">A <see cref="ParameterExpression"/> representing a reference to the <see cref="Exception"/> object caught by this handler.</param>
/// <param name="body">The body of the catch statement.</param>
/// <param name="filter">The body of the <see cref="Exception"/> filter.</param>
/// <returns>The created <see cref="CatchBlock"/>.</returns>
/// <remarks><paramref name="type"/> must be non-null and match the type of <paramref name="variable"/> (if it is supplied).</remarks>
public static CatchBlock MakeCatchBlock(Type type, ParameterExpression variable, Expression body, Expression filter)
{
ContractUtils.RequiresNotNull(type, nameof(type));
ContractUtils.Requires(variable == null || TypeUtils.AreEquivalent(variable.Type, type), nameof(variable));
if (variable == null)
{
TypeUtils.ValidateType(type, nameof(type));
if (type.IsByRef)
{
throw Error.TypeMustNotBeByRef(nameof(type));
}
if (type.IsPointer)
{
throw Error.TypeMustNotBePointer(nameof(type));
}
}
else if (variable.IsByRef)
{
throw Error.VariableMustNotBeByRef(variable, variable.Type, nameof(variable));
}
ExpressionUtils.RequiresCanRead(body, nameof(body));
if (filter != null)
{
ExpressionUtils.RequiresCanRead(filter, nameof(filter));
if (filter.Type != typeof(bool))
{
throw Error.ArgumentMustBeBoolean(nameof(filter));
}
}
return(new CatchBlock(type, variable, body, filter));
}
/// <summary>
/// Creates a catch block.
/// </summary>
/// <param name="variables">The variables introduced by the catch block.</param>
/// <param name="type">The type of the exceptions to handle.</param>
/// <param name="variable">The variable to assign a caught exception to.</param>
/// <param name="body">The body of the catch block.</param>
/// <param name="filter">The filter to apply.</param>
/// <returns>The created <see cref="CSharpCatchBlock"/>.</returns>
public static CSharpCatchBlock MakeCatchBlock(IEnumerable <ParameterExpression> variables, Type type, ParameterExpression variable, Expression body, Expression filter)
{
var variablesList = CheckUniqueVariables(variables, nameof(variables));
Requires(variable == null || AreEquivalent(variable.Type, type), nameof(variable));
if (variable != null)
{
if (variable.IsByRef)
{
throw LinqError.VariableMustNotBeByRef(variable, variable.Type);
}
// REVIEW: See UsingCSharpStatement for a similar situation.
if (!variablesList.Contains(variable))
{
throw Error.CatchVariableNotInScope(variable);
}
if (type == null)
{
type = variable.Type;
}
else if (!AreEquivalent(type, variable.Type))
{
throw Error.CatchTypeNotEquivalentWithVariableType(type, variable.Type);
}
}
else if (type != null)
{
ValidateType(type);
}
else
{
type = typeof(object); // NB: Used to catch all.
}
RequiresCanRead(body, nameof(body));
if (filter != null)
{
RequiresCanRead(filter, nameof(filter));
if (filter.Type != typeof(bool))
{
throw LinqError.ArgumentMustBeBoolean();
}
}
return(new CSharpCatchBlock(variablesList, type, variable, body, filter));
}
/// <summary>
/// Creates an object holding type information about a pattern.
/// </summary>
/// <param name="info">The underlying type information.</param>
/// <param name="variable">The CSharpObjectPatternInfo to assign to upon successfully matching the associated pattern.</param>
/// <returns>A <see cref="CSharpPatternInfo" /> object holding type information about a pattern.</returns>
public static CSharpObjectPatternInfo ObjectPatternInfo(CSharpPatternInfo info, ParameterExpression variable)
{
info ??= PatternInfo(typeof(object), variable?.Type ?? typeof(object));
if (variable != null)
{
if (variable.Type.IsByRef)
{
throw LinqError.VariableMustNotBeByRef(variable, variable.Type);
}
RequiresCompatiblePatternTypes(info.NarrowedType, variable.Type);
}
return(new CSharpObjectPatternInfo(info, variable));
}
/// <summary>
/// Creates a <see cref="CatchBlock"/> representing a catch statement with the specified elements.
/// </summary>
/// <param name="type">The <see cref="Type"/> of <see cref="Exception"/> this <see cref="CatchBlock"/> will handle.</param>
/// <param name="variable">A <see cref="ParameterExpression"/> representing a reference to the <see cref="Exception"/> object caught by this handler.</param>
/// <param name="body">The body of the catch statement.</param>
/// <param name="filter">The body of the <see cref="Exception"/> filter.</param>
/// <returns>The created <see cref="CatchBlock"/>.</returns>
/// <remarks><paramref name="type"/> must be non-null and match the type of <paramref name="variable"/> (if it is supplied).</remarks>
public static CatchBlock MakeCatchBlock(Type type, ParameterExpression variable, Expression body, Expression filter)
{
ContractUtils.RequiresNotNull(type, "type");
ContractUtils.Requires(variable == null || TypeUtils.AreEquivalent(variable.Type, type), "variable");
if (variable != null && variable.IsByRef)
{
throw Error.VariableMustNotBeByRef(variable, variable.Type);
}
RequiresCanRead(body, "body");
if (filter != null)
{
RequiresCanRead(filter, "filter");
if (filter.Type != typeof(bool))
{
throw Error.ArgumentMustBeBoolean();
}
}
return(new CatchBlock(type, variable, body, filter));
}
// Checks that all variables are non-null, not byref, and unique.
internal static void ValidateVariables(ReadOnlyCollection <ParameterExpression> varList, string collectionName)
{
int count = varList.Count;
if (count != 0)
{
var set = new HashSet <ParameterExpression>();
for (int i = 0; i < count; i++)
{
ParameterExpression v = varList[i];
ContractUtils.RequiresNotNull(v, collectionName, i);
if (v.IsByRef)
{
throw Error.VariableMustNotBeByRef(v, v.Type, collectionName, i);
}
if (!set.Add(v))
{
throw Error.DuplicateVariable(v, collectionName, i);
}
}
}
}
