Tuple<CodeTypeDeclaration, CodeTypeDeclaration> GenerateFunctionType(XPathFunctionInfo[] functions)
{
XPathFunctionInfo first = functions.First();
XPathFunctionInfo leastParameters = functions.OrderBy(f => f.Parameters.Count).First();
XPathFunctionInfo mostParameters = functions.OrderByDescending(f => f.Parameters.Count).First();
XPathModuleInfo module = first.Module;
int minArgs = leastParameters.Parameters.Count;
int maxArgs = mostParameters.Parameters.Count;
CodeExpression thisRef = new CodeThisReferenceExpression();
var processorField = new CodeMemberField {
Name = "_processor",
Type = new CodeTypeReference(typeof(SaxonProcessor))
};
var funcNameField = new CodeMemberField {
Name = "_FunctionName",
Type = new CodeTypeReference(typeof(QName)),
InitExpression = new CodeObjectCreateExpression(
typeof(QName),
new CodePrimitiveExpression(module.Namespace),
new CodePrimitiveExpression(first.Name)
)
};
var argTypesField = new CodeMemberField {
Name = "_ArgumentTypes",
Type = new CodeTypeReference(typeof(XdmSequenceType[])),
InitExpression = new CodeArrayCreateExpression(
typeof(XdmSequenceType),
mostParameters.Parameters.Select(p =>
new CodeObjectCreateExpression(
typeof(XdmSequenceType),
GetXdmItemTypeExpression(p.Type.ItemType),
new CodePrimitiveExpression(GetOcurrenceIndicator(p.Type.Cardinality))
)).ToArray()
)
};
var resultTypesField = new CodeMemberField {
Name = "_resultTypes",
Type = new CodeTypeReference(typeof(XdmSequenceType[]))
};
var resultTypesFieldInit = new CodeArrayCreateExpression {
CreateType = resultTypesField.Type,
Size = functions.Length
};
for (int i = 0; i < functions.Length; i++) {
XPathFunctionInfo function = functions[i];
resultTypesFieldInit.Initializers.Add(
// Using item()? instead of empty-sequence()
(function.ReturnType.IsEmptySequence) ?
new CodeObjectCreateExpression(
typeof(XdmSequenceType),
new CodeFieldReferenceExpression(
new CodeTypeReferenceExpression(typeof(XdmAnyItemType)),
"Instance"
),
new CodePrimitiveExpression(GetOcurrenceIndicator(XPathSequenceCardinality.ZeroOrOne))
)
: new CodeObjectCreateExpression(
typeof(XdmSequenceType),
GetXdmItemTypeExpression(function.ReturnType.ItemType),
new CodePrimitiveExpression(GetOcurrenceIndicator(function.ReturnType.Cardinality))
)
);
}
resultTypesField.InitExpression = resultTypesFieldInit;
var defClass = new CodeTypeDeclaration {
Name = first.Method.Name + "Function",
Attributes = MemberAttributes.Public,
BaseTypes = { typeof(ExtensionFunctionDefinition) },
Members = {
processorField,
funcNameField,
argTypesField,
resultTypesField,
new CodeConstructor {
Attributes = MemberAttributes.Public,
Parameters = {
new CodeParameterDeclarationExpression(processorField.Type, "processor")
},
Statements = {
new CodeAssignStatement(
new CodeFieldReferenceExpression(thisRef, processorField.Name),
new CodeVariableReferenceExpression("processor")
)
}
},
new CodeMemberProperty {
Name = "FunctionName",
Type = funcNameField.Type,
Attributes = MemberAttributes.Public | MemberAttributes.Override,
HasGet = true,
GetStatements = {
new CodeMethodReturnStatement(new CodeFieldReferenceExpression(thisRef, funcNameField.Name))
}
},
new CodeMemberProperty {
Name = "ArgumentTypes",
Type = argTypesField.Type,
Attributes = MemberAttributes.Public | MemberAttributes.Override,
HasGet = true,
GetStatements = {
new CodeMethodReturnStatement(new CodeFieldReferenceExpression(thisRef, argTypesField.Name))
}
},
new CodeMemberProperty {
Name = "MaximumNumberOfArguments",
Type = new CodeTypeReference(typeof(int)),
Attributes = MemberAttributes.Public | MemberAttributes.Override,
HasGet = true,
GetStatements = {
new CodeMethodReturnStatement(new CodePrimitiveExpression(maxArgs))
}
},
new CodeMemberProperty {
Name = "MinimumNumberOfArguments",
Type = new CodeTypeReference(typeof(int)),
Attributes = MemberAttributes.Public | MemberAttributes.Override,
HasGet = true,
GetStatements = {
new CodeMethodReturnStatement(new CodePrimitiveExpression(minArgs))
}
},
GenerateResultTypeMethod(thisRef, resultTypesField)
}
};
if (first.HasSideEffects) {
defClass.Members.Add(new CodeMemberProperty {
Name = "HasSideEffects",
Type = new CodeTypeReference(typeof(bool)),
Attributes = MemberAttributes.Public | MemberAttributes.Override,
HasGet = true,
GetStatements = {
new CodeMethodReturnStatement(new CodePrimitiveExpression(true))
}
});
}
var callClass = new CodeTypeDeclaration {
Name = defClass.Name + "Call",
Attributes = MemberAttributes.Assembly,
BaseTypes = {
new CodeTypeReference(typeof(ExtensionFunctionCall))
},
Members = {
processorField,
new CodeConstructor {
Attributes = MemberAttributes.Public,
Parameters = {
new CodeParameterDeclarationExpression(processorField.Type, "processor")
},
Statements = {
new CodeAssignStatement(
new CodeFieldReferenceExpression(thisRef, processorField.Name),
new CodeVariableReferenceExpression("processor")
)
}
}
}
};
CodeMemberMethod initializeMethod = null;
if (!module.TypeIsStatic
&& module.Dependencies.Count > 0) {
CodeExpression staticBaseUriExpr = null;
if (module.Dependencies.Any(d => d.Type == typeof(XmlResolver))) {
var staticBaseUriField = new CodeMemberField {
Name = "_staticBaseUri",
Type = new CodeTypeReference(typeof(Uri))
};
callClass.Members.Add(staticBaseUriField);
var staticContextParam = new CodeParameterDeclarationExpression(typeof(StaticContext), "context");
staticBaseUriExpr = new CodeFieldReferenceExpression(thisRef, staticBaseUriField.Name);
callClass.Members.Add(new CodeMemberMethod {
Name = "SupplyStaticContext",
Attributes = MemberAttributes.Public | MemberAttributes.Override,
Parameters = {
staticContextParam
},
Statements = {
new CodeAssignStatement {
Left = staticBaseUriExpr,
Right = new CodePropertyReferenceExpression {
PropertyName = "BaseUri",
TargetObject = new CodeVariableReferenceExpression(staticContextParam.Name)
}
}
}
});
}
initializeMethod = GenerateInitialize(module, new CodeFieldReferenceExpression(thisRef, processorField.Name), staticBaseUriExpr);
callClass.Members.Add(initializeMethod);
}
callClass.Members.Add(GenerateCallMethod(functions, minArgs, maxArgs, new CodeFieldReferenceExpression(thisRef, processorField.Name), initializeMethod));
defClass.Members.Add(
new CodeMemberMethod {
Name = "MakeFunctionCall",
Attributes = MemberAttributes.Public | MemberAttributes.Override,
ReturnType = new CodeTypeReference(typeof(ExtensionFunctionCall)),
Statements = {
new CodeMethodReturnStatement(
new CodeObjectCreateExpression(
callClass.Name,
new CodeFieldReferenceExpression(thisRef, processorField.Name)
)
)
}
}
);
return Tuple.Create(defClass, callClass);
}
static CodeMemberMethod GenerateFunction(XPathFunctionInfo function, CodeExpression moduleExpr)
{
string name = function.Name;
MemberAttributes methodAttributes = MemberAttributes.Public;
if (name.Contains('-')) {
name = name.Replace('-', '_');
methodAttributes = MemberAttributes.Family;
}
methodAttributes |= MemberAttributes.Final;
Type procReturnType = GetReturnType(function.ReturnType);
var codeMethod = new CodeMemberMethod {
Name = name,
Attributes = methodAttributes,
ReturnType = new CodeTypeReference(procReturnType),
};
var methodInvoke = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression {
MethodName = function.Method.Name,
TargetObject = moduleExpr
}
};
for (int i = 0; i < function.Parameters.Count; i++) {
XPathSequenceType paramTypeInfo = function.Parameters[i].Type;
Type procParamType = GetParameterType(paramTypeInfo);
var paramDecl = new CodeParameterDeclarationExpression {
Name = "p" + i.ToStringInvariant(),
Type = new CodeTypeReference(procParamType)
};
codeMethod.Parameters.Add(paramDecl);
var paramVarExpr = new CodeVariableReferenceExpression(paramDecl.Name);
CodeExpression argExpr = GetArgumentExpression(paramTypeInfo, procParamType, paramVarExpr);
methodInvoke.Parameters.Add(argExpr);
}
CodeVariableReferenceExpression resultVarExpr = null;
if (function.ReturnType.ClrType == typeof(void)) {
codeMethod.Statements.Add(new CodeExpressionStatement(methodInvoke));
} else {
var resultVarDecl = new CodeVariableDeclarationStatement {
Name = "result",
InitExpression = methodInvoke,
Type = new CodeTypeReference(function.Method.ReturnType)
};
codeMethod.Statements.Add(resultVarDecl);
resultVarExpr = new CodeVariableReferenceExpression(resultVarDecl.Name);
}
CodeExpression returnExpr = GetReturnExpression(function.ReturnType, resultVarExpr);
codeMethod.Statements.Add(new CodeMethodReturnStatement(returnExpr));
return codeMethod;
}
CodeMemberMethod GenerateCallMethod(XPathFunctionInfo[] functions, int minArgs, int maxArgs, CodeExpression processorRef, CodeMemberMethod initializeMethod)
{
XPathFunctionInfo mostParameters = functions.OrderByDescending(f => f.Parameters.Count).First();
XPathModuleInfo module = mostParameters.Module;
var argsParam = new CodeParameterDeclarationExpression(typeof(IXdmEnumerator[]), "arguments");
var callMethod = new CodeMemberMethod {
Name = "Call",
Attributes = MemberAttributes.Public | MemberAttributes.Override,
ReturnType = new CodeTypeReference(typeof(IXdmEnumerator)),
Parameters = {
argsParam,
new CodeParameterDeclarationExpression(typeof(DynamicContext), "context")
}
};
var argumentsRef = new CodeVariableReferenceExpression(callMethod.Parameters[0].Name);
CodeExpression moduleRef;
if (module.TypeIsStatic) {
moduleRef = new CodeTypeReferenceExpression(module.Type);
} else {
var moduleVar = new CodeVariableDeclarationStatement {
Name = "module",
Type = new CodeTypeReference(module.Type),
InitExpression = new CodeObjectCreateExpression(module.Type)
};
callMethod.Statements.Add(moduleVar);
moduleRef = new CodeVariableReferenceExpression(moduleVar.Name);
if (initializeMethod != null) {
callMethod.Statements.Add(new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression(new CodeThisReferenceExpression(), initializeMethod.Name),
Parameters = { moduleRef }
});
}
}
CodeStatementCollection currentBlock = callMethod.Statements;
var paramRef = new List<CodeExpression>();
for (int pos = 0; pos <= maxArgs; pos++) {
if (pos > 0) {
XPathSequenceType paramInfo = mostParameters.Parameters[pos - 1].Type;
var paramVar = new CodeVariableDeclarationStatement {
Name = "p" + pos,
Type = new CodeTypeReference(paramInfo.ClrType),
InitExpression = TransformInput(argumentsRef, pos, paramInfo)
};
currentBlock.Add(paramVar);
paramRef.Add(new CodeVariableReferenceExpression(paramVar.Name));
}
if (pos >= minArgs) {
XPathFunctionInfo fn = functions[pos - minArgs];
CodeConditionStatement ifElse = null;
if (minArgs != maxArgs
&& pos < maxArgs) {
ifElse = new CodeConditionStatement {
Condition = new CodeBinaryOperatorExpression {
Left = new CodePropertyReferenceExpression(argumentsRef, "Length"),
Operator = CodeBinaryOperatorType.ValueEquality,
Right = new CodePrimitiveExpression(pos)
}
};
currentBlock.Add(ifElse);
currentBlock = ifElse.TrueStatements;
}
var functionInvoke = new CodeMethodInvokeExpression {
Method = new CodeMethodReferenceExpression(moduleRef, fn.Method.Name)
};
functionInvoke.Parameters.AddRange(paramRef.ToArray());
CodeExpression returnExpr;
if (!fn.ReturnType.IsEmptySequence) {
returnExpr = TransformOutput(functionInvoke, fn.ReturnType, processorRef);
} else {
currentBlock.Add(functionInvoke);
returnExpr = new CodePropertyReferenceExpression {
PropertyName = "INSTANCE",
TargetObject = new CodeTypeReferenceExpression(typeof(EmptyEnumerator))
};
}
currentBlock.Add(new CodeMethodReturnStatement(returnExpr));
if (ifElse != null) {
currentBlock = ifElse.FalseStatements;
}
}
}
return callMethod;
}
