internal XPathVariableInfo(string name, XPathSequenceType type)
{
this._Name = name;
this._Type = type;
}
static Type GetReturnType(XPathSequenceType returnTypeInfo)
{
switch (returnTypeInfo.Cardinality) {
default:
case XPathSequenceCardinality.One:
if (returnTypeInfo.ItemType.KindIsNode) {
return typeof(XPathNavigator);
}
return typeof(object);
case XPathSequenceCardinality.ZeroOrOne:
case XPathSequenceCardinality.ZeroOrMore:
return typeof(object);
case XPathSequenceCardinality.OneOrMore:
return typeof(XPathNavigator[]);
}
}
internal XPathVariableInfo(string name, XPathSequenceType type)
{
this._Name = name;
this._Type = type;
}
static CodeExpression GetReturnExpression(XPathSequenceType sequenceType, CodeVariableReferenceExpression varExpr)
{
if (sequenceType.ClrType == typeof(void)) {
return new CodePropertyReferenceExpression {
PropertyName = "EmptyIterator",
TargetObject = new CodeTypeReferenceExpression(typeof(ExtensionObjectConvert))
};
}
string convertMethod = "ToInput";
if (sequenceType.ItemType.KindIsNode) {
convertMethod += "Node";
}
if (sequenceType.Cardinality == XPathSequenceCardinality.ZeroOrMore
|| sequenceType.Cardinality == XPathSequenceCardinality.ZeroOrOne) {
convertMethod += "OrEmpty";
}
CodeExpression returnExpr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = convertMethod,
TargetObject = new CodeTypeReferenceExpression(typeof(ExtensionObjectConvert))
},
Parameters = { varExpr }
};
if (sequenceType.ItemType.Kind == XPathItemKind.Element
|| sequenceType.ItemType.Kind == XPathItemKind.SchemaElement) {
returnExpr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "FirstElementOrSelf",
TargetObject = new CodeTypeReferenceExpression(typeof(ExtensionObjectConvert))
},
Parameters = { returnExpr }
};
}
return returnExpr;
}
static Type GetParameterType(XPathSequenceType paramTypeInfo)
{
switch (paramTypeInfo.Cardinality) {
case XPathSequenceCardinality.One:
if (paramTypeInfo.ItemType.Kind == XPathItemKind.AnyItem) {
return typeof(object);
}
if (paramTypeInfo.ItemType.KindIsNode) {
return typeof(XPathNavigator);
}
switch (Type.GetTypeCode(paramTypeInfo.ItemType.ClrType)) {
default:
case TypeCode.String:
case TypeCode.Char:
case TypeCode.Object:
return typeof(string);
case TypeCode.Boolean:
return typeof(bool);
case TypeCode.Byte:
return typeof(byte);
case TypeCode.DateTime:
return typeof(DateTime);
case TypeCode.Decimal:
return typeof(decimal);
case TypeCode.Double:
return typeof(double);
case TypeCode.Int16:
return typeof(Int16);
case TypeCode.Int32:
return typeof(Int32);
case TypeCode.Int64:
return typeof(Int64);
case TypeCode.SByte:
return typeof(SByte);
case TypeCode.Single:
return typeof(Single);
case TypeCode.UInt16:
return typeof(UInt16);
case TypeCode.UInt32:
return typeof(UInt32);
case TypeCode.UInt64:
return typeof(UInt64);
}
default:
return typeof(XPathNodeIterator);
}
}
static CodeExpression GetArgumentExpression(XPathSequenceType paramTypeInfo, Type varType, CodeVariableReferenceExpression varExpr)
{
var convertTypeExpr = new CodeTypeReferenceExpression(typeof(ExtensionObjectConvert));
CodeExpression argExpr = varExpr;
if (paramTypeInfo.ClrType.IsAssignableFrom(varType)) {
return argExpr;
}
MethodInfo convertMethod = typeof(ExtensionObjectConvert)
.GetMethod("To" + paramTypeInfo.ClrType.Name, BindingFlags.Public | BindingFlags.Static, null, new[] { varType }, null);
if (convertMethod != null) {
return new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = convertMethod.Name,
TargetObject = convertTypeExpr,
},
Parameters = { argExpr }
};
}
MethodInfo convertItemMethod = typeof(ExtensionObjectConvert)
.GetMethod("To" + paramTypeInfo.ItemType.ClrType.Name, BindingFlags.Public | BindingFlags.Static, null, new[] { typeof(XPathItem) }, null);
CodeExpression convertItemExpr = (convertItemMethod != null) ?
new CodeMethodReferenceExpression(convertTypeExpr, convertItemMethod.Name)
: null;
if (paramTypeInfo.ClrTypeIsEnumerable) {
CodeMethodInvokeExpression methodExpr;
argExpr = methodExpr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "ToEnumerable",
TypeArguments = { paramTypeInfo.ItemType.ClrType },
TargetObject = convertTypeExpr
},
Parameters = { argExpr }
};
if (convertItemExpr != null) {
methodExpr.Parameters.Add(convertItemExpr);
}
if (paramTypeInfo.ClrType.IsArray) {
argExpr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "ToArray",
TypeArguments = { paramTypeInfo.ItemType.ClrType },
TargetObject = new CodeTypeReferenceExpression(typeof(Enumerable))
},
Parameters = { argExpr }
};
}
} else if (paramTypeInfo.ClrTypeIsNullableValueType) {
CodeMethodInvokeExpression methodExpr;
argExpr = methodExpr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "ToNullableValueType",
TypeArguments = { paramTypeInfo.ItemType.ClrType },
TargetObject = convertTypeExpr
},
Parameters = { argExpr }
};
if (convertItemExpr != null) {
methodExpr.Parameters.Add(convertItemExpr);
}
} else {
CodeMethodInvokeExpression methodExpr;
argExpr = methodExpr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "ToOutput",
TypeArguments = { paramTypeInfo.ClrType },
TargetObject = convertTypeExpr
},
Parameters = { argExpr }
};
if (convertItemExpr != null
&& paramTypeInfo.ClrType == paramTypeInfo.ItemType.ClrType) {
methodExpr.Parameters.Add(convertItemExpr);
}
}
return argExpr;
}
CodeExpression TransformInput(CodeVariableReferenceExpression argumentsRef, int position, XPathSequenceType sequenceType)
{
var codeBuilder = new StringBuilder()
.Append(argumentsRef.VariableName)
.AppendFormatInvariant("[{0}]", position - 1);
bool isAtomic = sequenceType.ItemType.Kind == XPathItemKind.Atomic;
bool isNode = sequenceType.ItemType.KindIsNode;
if (isAtomic) {
codeBuilder.Append(".AsAtomicValues()");
} else if (isNode) {
codeBuilder.Append(".AsNodes()");
} else {
codeBuilder.Append(".AsItems()");
}
var itemExpr = new StringBuilder("x");
if (isAtomic) {
itemExpr.Append(".Value");
QName atomicSchemaType = GetAtomicSchemaType(sequenceType.ItemType);
Type expectedType = sequenceType.ItemType.ClrType;
Type actualType = (atomicSchemaType.Uri == XMLSchemaNamespace) ?
SaxonAtomicMapping(atomicSchemaType.LocalName)
: typeof(object);
string expectedTypeName = GetCSharpFullName(expectedType);
if (expectedType.IsAssignableFrom(actualType)) {
itemExpr.Insert(0, "({0})".FormatInvariant(expectedTypeName));
} else {
if (actualType == typeof(QName)
&& expectedType == typeof(XmlQualifiedName)) {
itemExpr.Insert(0, "(({0})".FormatInvariant(GetCSharpFullName(actualType)));
itemExpr.Append(").ToXmlQualifiedName()");
} else {
itemExpr.Insert(0, "({0}){1}.ChangeType(".FormatInvariant(expectedTypeName, typeof(Convert).FullName));
itemExpr.AppendFormatInvariant(", typeof({0}))", expectedTypeName);
}
}
} else if (isNode) {
itemExpr.Append(".ToXPathNavigator()");
} else {
itemExpr.Append(".ToXPathItem()");
}
if (itemExpr.Length > 1) {
codeBuilder.Append(".Select(x => ");
codeBuilder.Append(itemExpr.ToString());
codeBuilder.Append(")");
}
switch (sequenceType.Cardinality) {
case XPathSequenceCardinality.One:
codeBuilder.Append(".Single()");
break;
case XPathSequenceCardinality.ZeroOrOne:
if (sequenceType.ClrTypeIsNullableValueType) {
codeBuilder.Insert(0, typeof(SaxonExtensions).FullName + ".SingleOrNull(");
codeBuilder.Append(")");
} else {
codeBuilder.Append(".SingleOrDefault()");
}
break;
case XPathSequenceCardinality.OneOrMore:
case XPathSequenceCardinality.ZeroOrMore:
if (sequenceType.ClrType.IsArray) {
codeBuilder.Append(".ToArray()");
}
break;
}
return new CodeSnippetExpression(codeBuilder.ToString());
}
static CodeExpression TransformOutput(CodeExpression functionResultRef, XPathSequenceType sequenceType, CodeExpression processorRef)
{
CodeExpression itemFactoryRef = GetItemFactoryReference(processorRef);
CodeExpression expr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "ToXdmValue",
TargetObject = new CodeTypeReferenceExpression(typeof(SaxonExtensions))
},
Parameters = {
functionResultRef,
itemFactoryRef
}
};
if (sequenceType.ItemType.Kind == XPathItemKind.Element
|| sequenceType.ItemType.Kind == XPathItemKind.SchemaElement) {
expr = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "FirstElementOrSelf",
TargetObject = new CodeTypeReferenceExpression(typeof(SaxonExtensions))
},
Parameters = { expr }
};
}
return new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = "GetXdmEnumerator",
TargetObject = new CodeTypeReferenceExpression(typeof(SaxonExtensions))
},
Parameters = { expr }
};
}
