// Call a function with native arguments, get a return value or null if void
public Result Evaluate(string name, params object[] arguments)
{
var kind = _catvars.GetKind(name);
if (kind != EntryKinds.Code)
{
return(Result.Failure("unknown or invalid name"));
}
var expr = (_catvars.GetValue(name) as CodeValue).Value;
if (arguments.Length != expr.Lookup.Degree)
{
return(Result.Failure("wrong no of args"));
}
var argvalues = arguments.Select((a, x) => TypeMaker.FromNativeValue(a, expr.Lookup.Columns[x].DataType)).ToArray();
var args = DataRow.CreateNonTuple(expr.Lookup, argvalues);
TypedValue value = null;
try {
value = _evaluator.Exec(expr.Code, args);
} catch (ProgramException ex) {
return(Result.Failure(ex.ToString()));
}
var nvalue = (value == VoidValue.Void) ? null : TypeMaker.ToNativeValue(value);
return(Result.Success(nvalue));
}
// Get a native value from a variable or parameterless function
public Result GetValue(string name)
{
var kind = _catvars.GetKind(name);
if (kind == EntryKinds.Code)
{
return(Evaluate(name));
}
if (kind != EntryKinds.Value)
{
return(Result.Failure("unknown or invalid name"));
}
var nvalue = TypeMaker.ToNativeValue(_catvars.GetValue(name));
return(Result.Success(nvalue));
}
// call a function with args passed in json, return Result in json
public Result JsonCall(string name, params string[] jsonargs)
{
var kind = _catvars.GetKind(name);
if (kind != EntryKinds.Code)
{
return(Result.Failure("unknown or invalid name"));
}
var expr = (_catvars.GetValue(name) as CodeValue).Value;
if (expr.Lookup.Degree != jsonargs.Length)
{
return(Result.Failure("wrong no of args"));
}
DataRow argvalue;
TypedValue retvalue;
try {
var argvalues = jsonargs.Select((a, x) => {
var datatype = expr.Lookup.Columns[x].DataType;
var nvalue = JsonConvert.DeserializeObject(a, datatype.NativeType);
return(TypeMaker.FromNativeValue(nvalue, datatype));
}).ToArray();
argvalue = DataRow.CreateNonTuple(expr.Lookup, argvalues);
} catch {
return(Result.Failure("argument conversion error"));
}
try {
retvalue = _evaluator.Exec(expr.Code, argvalue);
} catch (ProgramException ex) {
return(Result.Failure(ex.ToString()));
}
if (retvalue != VoidValue.Void)
{
var nret = TypeMaker.ToNativeValue(retvalue);
if (_runtime.JsonReturnFlag) // FIX: s/b default
{
var jret = JsonConvert.SerializeObject(nret);
return(Result.Success(jret));
}
return(Result.Success(nret));
}
return(Result.Success(null));
}
// call a function with args passed as id, query and json, return Result with message or json
// NOTE: empty query array here is NOT the same as a null
public Result JsonCall(string name, string id, KeyValuePair <string, string>[] query, string json)
{
var kind = _catvars.GetKind(name);
if (kind != EntryKinds.Code)
{
return(Result.Failure("unknown or invalid name: " + name));
}
var expr = (_catvars.GetValue(name) as CodeValue).Value;
var argcount = (id != null ? 1 : 0) + (query != null ? 1 : 0) + (json != null ? 1 : 0);
if (expr.Lookup.Degree != argcount)
{
return(Result.Failure("wrong no of args, expected " + expr.Lookup.Degree.ToString()));
}
DataRow argvalue;
List <object> nargvalues = new List <object>();
TypedValue retvalue;
// convert each argument to a native form TypeMaker will understand
if (id != null)
{
nargvalues.Add(id);
}
if (query != null && query.Length > 0)
{
nargvalues.Add(query.Select(kvp => new KeyValue {
Key = kvp.Key, Value = kvp.Value
}).ToList());
}
if (json != null)
{
try {
var datatype = expr.Lookup.Columns[nargvalues.Count].DataType;
nargvalues.Add(JsonConvert.DeserializeObject(json, datatype.NativeType));
} catch {
return(Result.Failure("json conversion error"));
}
}
try {
var argvalues = nargvalues.Select((nv, x) => {
var datatype = expr.Lookup.Columns[x].DataType;
return(TypeMaker.FromNativeValue(nv, datatype));
}).ToArray();
argvalue = DataRow.CreateNonTuple(expr.Lookup, argvalues);
} catch {
return(Result.Failure("argument conversion error"));
}
try {
retvalue = _evaluator.Exec(expr.Code, argvalue);
} catch (ProgramException ex) {
return(Result.Failure(ex.ToString()));
}
var nret = (retvalue == VoidValue.Void) ? null : TypeMaker.ToNativeValue(retvalue);
if (_runtime.JsonReturnFlag) // FIX: s/b default
{
var jret = JsonConvert.SerializeObject(nret);
return(Result.Success(jret));
}
return(Result.Success(nret));
}