private ReactMethodImpl MakeReturningMethod(ReflectionMethodInfo methodInfo, Type returnType, ParameterInfo[] parameters)
{
// It is like the MakeCallbackMethod but callback is not passed as a parameter.
// Input parameters for generated lambda
ParameterExpression moduleParameter = Expression.Parameter(typeof(object), "module");
ParameterExpression inputReaderParameter = Expression.Parameter(typeof(IJSValueReader), "inputReader");
ParameterExpression outputWriterParameter = Expression.Parameter(typeof(IJSValueWriter), "outputWriter");
ParameterExpression resolveParameter = Expression.Parameter(typeof(MethodResultCallback), "resolve");
ParameterExpression rejectParameter = Expression.Parameter(typeof(MethodResultCallback), "reject");
// Input variables to read from inputReader
ParameterExpression[] inputVariables = new ParameterExpression[parameters.Length];
for (int i = 0; i < parameters.Length; ++i)
{
inputVariables[i] = Expression.Variable(parameters[i].ParameterType, parameters[i].Name);
}
// The result variable to store method call result
var resultVariable = Expression.Variable(returnType);
// Statements of the generated lambda
List <Expression> statements = new List <Expression>();
// Generate code to read input variables from the inputReader
var callReadNext = Expression.Call(inputReaderParameter, typeof(IJSValueReader).GetMethod("ReadNext"));
statements.Add(callReadNext);
foreach (ParameterExpression variable in inputVariables)
{
statements.Add(callReadNext);
statements.Add(Expression.Call(null, JSValueReader.GetReadValueMethod(variable.Type), inputReaderParameter, variable));
}
// Generate code to call the method
statements.Add(Expression.Assign(resultVariable,
Expression.Call(
Expression.Convert(moduleParameter, methodInfo.DeclaringType),
methodInfo,
inputVariables)));
// Generate code to write result to outputWriter
statements.Add(Expression.Call(outputWriterParameter, typeof(IJSValueWriter).GetMethod("WriteArrayBegin")));
statements.Add(Expression.Call(null, JSValueWriter.GetWriteValueMethod(resultVariable.Type), outputWriterParameter, resultVariable));
statements.Add(Expression.Call(outputWriterParameter, typeof(IJSValueWriter).GetMethod("WriteArrayEnd")));
// Generate code to call resolve callback
statements.Add(Expression.Invoke(resolveParameter, outputWriterParameter));
// Generate the lambda to return
var lambda = Expression.Lambda <ReactMethodImpl>(
Expression.Block(inputVariables.Append(resultVariable), statements),
moduleParameter, inputReaderParameter, outputWriterParameter, resolveParameter, rejectParameter);
// Compile and return the lambda
return(lambda.Compile());
}
private ReactConstantImpl MakePropertyConstant(PropertyInfo propertyInfo)
{
ParameterExpression moduleParameter = Expression.Parameter(typeof(object), "module");
ParameterExpression writerParameter = Expression.Parameter(typeof(IJSValueWriter), "writer");
bool isStatic = propertyInfo.GetGetMethod().IsStatic;
Type propertyType = propertyInfo.PropertyType;
var constantProperty = Expression.Property(isStatic ? null : Expression.Convert(moduleParameter, propertyInfo.DeclaringType), propertyInfo);
var writeValueCall = Expression.Call(null, JSValueWriter.GetWriteValueMethod(propertyType), writerParameter, constantProperty);
var lambda = Expression.Lambda <ReactConstantImpl>(writeValueCall, moduleParameter, writerParameter);
return(lambda.Compile());
}
private ReactConstantImpl MakeFieldConstant(FieldInfo fieldInfo)
{
ParameterExpression moduleParameter = Expression.Parameter(typeof(object), "module");
ParameterExpression writerParameter = Expression.Parameter(typeof(IJSValueWriter), "writer");
bool isStatic = fieldInfo.IsStatic;
Type fieldType = fieldInfo.FieldType;
var constantField = Expression.Field(isStatic ? null : Expression.Convert(moduleParameter, fieldInfo.DeclaringType), fieldInfo);
var writeValueCall = Expression.Call(null, JSValueWriter.GetWriteValueMethod(fieldType), writerParameter, constantField);
var lambda = Expression.Lambda <ReactConstantImpl>(writeValueCall, moduleParameter, writerParameter);
return(lambda.Compile());
}
private ReactEventImpl MakeEvent(PropertyInfo propertyInfo, ParameterInfo parameter)
{
// We need to create a delegate that can assign correct delegate to the event property.
// This is the shape of the generated code:
//
//(object module, RaiseEvent raiseEvent) =>
//{
// ((MyModule)module).eventProperty = (ArgType arg) =>
// {
// raiseEvent((IJSValueWriter argWriter) => WriteValue(argWriter, arg));
// };
//});
//
// Input parameters for generated lambda
ParameterExpression moduleParameter = Expression.Parameter(typeof(object), "module");
ParameterExpression raiseEventParameter = Expression.Parameter(typeof(ReactEventHandler), "eventHandler");
// Create a lambda to be passed to raiseEvent
ParameterExpression argParameter = Expression.Parameter(parameter.ParameterType, "arg");
ParameterExpression argWriterParameter = Expression.Parameter(typeof(IJSValueWriter), "argWriter");
var writeValueCall = Expression.Call(null, JSValueWriter.GetWriteValueMethod(parameter.ParameterType), argWriterParameter, argParameter);
var eventHandlerLambda = Expression.Lambda <ReactArgWriter>(writeValueCall, argWriterParameter);
// Create a lambda that we assign to the event property
var raiseEventCall = Expression.Invoke(raiseEventParameter, eventHandlerLambda);
var eventLambda = Expression.Lambda(propertyInfo.PropertyType, raiseEventCall, argParameter);
// Create lambda that we return and which assigns the event property
var eventProperty = Expression.Property(Expression.Convert(moduleParameter, propertyInfo.DeclaringType), propertyInfo);
var eventPropertyAssignment = Expression.Assign(eventProperty, eventLambda);
var lambda = Expression.Lambda <ReactEventImpl>(eventPropertyAssignment, moduleParameter, raiseEventParameter);
// Compile and return the lambda
return(lambda.Compile());
}
private ReactMethodImpl MakeCallbackMethod(ReflectionMethodInfo methodInfo, ParameterInfo[] parameters)
{
// The last variable is a delegate
// Input parameters for generated lambda
ParameterExpression moduleParameter = Expression.Parameter(typeof(object), "module");
ParameterExpression inputReaderParameter = Expression.Parameter(typeof(IJSValueReader), "inputReader");
ParameterExpression outputWriterParameter = Expression.Parameter(typeof(IJSValueWriter), "outputWriter");
ParameterExpression resolveParameter = Expression.Parameter(typeof(MethodResultCallback), "resolve");
ParameterExpression rejectParameter = Expression.Parameter(typeof(MethodResultCallback), "reject");
// Input variables to read from inputReader
ParameterExpression[] inputVariables = new ParameterExpression[parameters.Length - 1];
for (int i = 0; i < inputVariables.Length; ++i)
{
inputVariables[i] = Expression.Variable(parameters[i].ParameterType, parameters[i].Name);
}
// Generate the resolve delegate
var inputResolveParameter = parameters[parameters.Length - 1];
var resolveMethodInfo = inputResolveParameter.ParameterType.GetMethod("Invoke");
ParameterInfo[] resolveMethodParameters = resolveMethodInfo.GetParameters();
if (resolveMethodParameters.Length != 1)
{
throw new ArgumentException($"Resolve callback type must have one parameter. Method: {MethodName}, Parameter: {inputResolveParameter.Name}");
}
Type resolveParameterType = resolveMethodParameters[0].ParameterType;
ParameterExpression resolveLambdaParameter = Expression.Parameter(resolveParameterType, "value");
List <Expression> resolveStatements = new List <Expression>();
resolveStatements.Add(Expression.Call(outputWriterParameter, typeof(IJSValueWriter).GetMethod("WriteArrayBegin")));
resolveStatements.Add(Expression.Call(null, JSValueWriter.GetWriteValueMethod(resolveParameterType), outputWriterParameter, resolveLambdaParameter));
resolveStatements.Add(Expression.Call(outputWriterParameter, typeof(IJSValueWriter).GetMethod("WriteArrayEnd")));
resolveStatements.Add(Expression.Invoke(resolveParameter, outputWriterParameter));
var resolveLambda = Expression.Lambda(inputResolveParameter.ParameterType, Expression.Block(resolveStatements), resolveLambdaParameter);
// Statements of the generated lambda
List <Expression> statements = new List <Expression>();
// Generate code to read input variables from the inputReader
var callReadNext = Expression.Call(inputReaderParameter, typeof(IJSValueReader).GetMethod("ReadNext"));
statements.Add(callReadNext);
foreach (ParameterExpression variable in inputVariables)
{
statements.Add(callReadNext);
statements.Add(Expression.Call(null, JSValueReader.GetReadValueMethod(variable.Type), inputReaderParameter, variable));
}
// Generate code to call the method
statements.Add(Expression.Call(
Expression.Convert(moduleParameter, methodInfo.DeclaringType),
methodInfo,
(inputVariables as IEnumerable <Expression>).Append(resolveLambda)));
// Generate the lambda to return
var lambda = Expression.Lambda <ReactMethodImpl>(
Expression.Block(inputVariables, statements),
moduleParameter, inputReaderParameter, outputWriterParameter, resolveParameter, rejectParameter);
// Compile and return the lambda
return(lambda.Compile());
}
