addon.cpp

/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/**
* Return the positive difference between `x` and `y`.
*/
#include <nan.h>
#include "stdlib_base_pdiff.h"

/**
* Add-on namespace.
*/
namespace addon_base_pdiff {

	using Nan::FunctionCallbackInfo;
	using Nan::ThrowTypeError;
	using Nan::ThrowError;
	using v8::Number;
	using v8::Local;
	using v8::Value;

	/**
	* Returns the positive difference between `x` and `y`.
	*
	* When called from JavaScript, the function expects two arguments:
	*
	* * __x__: first number.
	* * __y__: second number.
	*
	* @param info   arguments
	*/
	void node_pdiff( const FunctionCallbackInfo<Value>& info ) {
		if ( info.Length() != 2 ) {
			ThrowError( "invalid invocation. Must provide 2 arguments." );
			return;
		}
		if ( !info[ 0 ]->IsNumber() ) {
			ThrowTypeError( "invalid input argument. First argument must be a number." );
			return;
		}
		if ( !info[ 1 ]->IsNumber() ) {
			ThrowTypeError( "invalid input argument. Second argument must be a number." );
			return;
		}
		const double x = info[ 0 ]->NumberValue();
		const double y = info[ 1 ]->NumberValue();

		Local<Number> out = Nan::New( stdlib_base_pdiff( x, y ) );
		info.GetReturnValue().Set( out );
	}

	NAN_MODULE_INIT( Init ) {
		Nan::Export( target, "pdiff", node_pdiff );
	}

	NODE_MODULE( addon, Init )
} // end namespace addon_base_pdiff