Dpdl (Dynamic Packet Definition Language)

Dpdl is a rapid development programming language and constrained device framework with built-in database and agent technology.

Dpdl comes as a very compact and portable execution engine (DpdlEngine) with an extensible API interface that enables to execute Dpdl programming language code, as well as code in different programming languages or any other custom code syntax, directly embedded within the same dpdl source code, simultaneously, of multiple types and at native speed. Dpdl enables polyglot programs.

The Dpdl language constructs and syntax is simple and intuitive, yet powerful, with an object oriented paradigm (OOP) interoperable with JVM platform APIs and Native shared libraries. It enables also dynamic code generation and execution of heterogeneous embedded code sections, featuring meta-programming techniques.

Dpdl provides access to jvm platform API’s, Native shared libraries, Wasm modules and GPU compute. In addition Dpdl enables also the embedding and execution of multiple programming languages like C, C++, Python & MicroPython, Julia, JavaScript, Lua, Ruby, Java, PHP, Perl, Groovy, V, Scheme, Clojure, Wat/Wasm, Wgsl, OpenCL and Modelica, directly embedded within dpdl code.

Everything comes already included with the DpdlEngine, No additional installations required.

The core DpdlEngine has the capability to run also on very limited memory constrained devices and platforms via a dedicated compact kilobyte range code virtual machine.

Compact, Self-contained, Portable and Customizable

Dpdl = dpdl-lang + ( C + ‘C++’ + Python + JavaScript + Julia + Java + Lua + Ruby + PHP + Perl + Groovy + V + Scheme + Clojure + Wat/Wasm + Wgsl + OpenCL + Modelica) + AI = Powerful and Versatile

Dpdl itself is a general-purpose programming language, self-contained, interpreted and in part dynamically JVM bytecode compiled, statically as well as dynamically typed, with a very compact memory footprint and portable to most platforms. There is an on-going development to enable Dpdl code to be compiled also directly to native code for multiple target platforms.

Dpdl introduces the concept of ‘embedded code sections’ that can be executed within Dpdl code by means of dedicated ‘Dpdl language plug-ins’ included in the ‘DpdlEngine’ release.

Multiple ‘Dpdl language plug-ins’ are currently available for various programming languages. For example also the ‘Modelica’ language for cyber-physical simulations is available as ‘Dpdl language plug-in’. Further Dpdl language plug-ins are currently in active development, for example to enable also Quantum Computing directly inside Dpdl.

Dpdl enables also AI generative code with the included Dpdl language plug-in ‘DpdlAINerd’ (DAN), which enables to automatically generate programming language code and content or data by means of natural language descriptions contained inside dpdl code, embed it automatically within dpdl code and execute the code right away or to be executed in a subsequent steps.

Dpdl provides also access to a custom data container with built-in database technology referred to as a ‘DpdlPacket’. It provides a convenient way to package, handle and query data very efficiently on memory scarce devices.

Dpdl is designed to:

DpdlEngine stack overview

Compact, Robust, Extensible and Portable

Common IoT protocol stacks such as Bluetooth™ and CoAP (Constrained Application Protocol) are integrated by default and third party libraries and protocols can be added as extensions.

Dpdl provides a simple access to java API’s, Native shared libraries, Wasm modules and GPU compute.

The included Dpdl language plug-in ‘DpdlAINerd’ (DAN) enables to make use of AI generative code to automatically generate and embed executable code and content or data by means of natural language descriptions contained inside Dpdl code.

The custom ‘DpdlPacket’ data container with built-in database technology provides a convenient way to package, handle and query data efficiently on memory scarce devices.

Dpdl enables the integration of different technologies to leverage fast prototyping and foster research and development.

Dpdl can be used as:

Features

For more Info visit the official Dpdl-io repository on GitHub:
DpdlEngine

Prototype sample applications implemented with Dpdl can be found on this GitHub repository:
Dpdl-sample-Apps

Dpdl JVM access

Dpdl provides API functions to load and access java objects and methods of the underlying JVM platform and of any other external java libraries. This allows to use a broad set of API’s within Dpdl.

Dpdl Example using external Java libraries

This is a sample Dpdl app implementing a 3D model visualization of chemical molecules using the JavaFX library. The model can be rotated freely with mouse events.

graphics/dpdl3DJavaFX_molecule.h

VIDEO of Dpdl sample 3D application

Dpdl language plug-ins ( ‘embedded code sections’ )

Multiple programming languages can be embedded and executed within the same Dpdl code via configurable Dpdl language plug-ins by using the keyword >>.

Further programming languages and syntax interpreters can be developed and integrated via a dedicated plug-in interface and configuration if form of Dpdl language plug-ins.

This enables basically every sort of programming language or natural language interpreter to be embedded directly in Dpdl code.

This features is very useful for rapid development and rapid prototyping and is also a key feature for generative code.

Currently the following programming languages can be embedded directly within Dpdl:

and also for some less known, but yet very powerful programming languages:

available Add-on ‘Dpdl language plug-ins’:

See this doc for more details: Dpdl_language_plugins.md

In development ‘Dpdl language plug-ins’ (available soon in coming releases):

Dpdl Example with ‘embedded code sections’

Sample Dpdl code with embedded code sections in ‘C’ code and ‘javascript’:

struct  A  {
	string id = "A"
	int  x = 10
	float f = 0.3
	double d = 0.4d
	object stro = new("String",  "This is a java.lang.String object")

	func print()
		println("------------------")
		println("id: "  + id)
	end
}

# main
println("With Dpdl you can make use of any java library and embed different programming languages...")

struct A mya
mya.print()

println("creating a hashmap to store key/value pairs...")

object mymap = new("HashMap")
mymap.put(1,  "Dpdl")
mymap.put(2,  "is")
mymap.put(3,  "Simple")
mymap.put(4,  "Compact")
mymap.put(5,  "Portable")

object keys = mymap.keySet()
object iter = keys.iterator()
object key, value
for(iter.hasNext())
	key = iter.next()
	value = mymap.get(key)
	println("key: "  + key +  " value: "  + value)
endfor

bool bcon = mymap.containsValue("Dpdl")
println("mymap contains 'Dpdl': "  + bcon)
println("")

println("Embed different programming languages directly..")
println("")

int n = 6
double x = 10.0d
string a = "test"
println("embedding C...")

dpdl_stack_push("dpdlbuf_var1",n, x, a)
>>c
#include <stdio.h>
#include <dpdl.h>

int dpdl_main(int argc,  char  **argv){
	printf("Hello C from Dpdl!\n");
	printf("\n");
	printf("num  params: %d\n", argc);
	int cnt;
	for (cnt =  0; cnt < argc; cnt++){
		printf(" param %d: %s\n", cnt, argv[cnt]);
	}
	char *buf = "My result";
	dpdl_stack_buf_put(buf);
	return  0;
}
<<
int exit_code = dpdl_exit_code()
println("embedded C exit code: "  + exit_code);
string buf = dpdl_stack_buf_get("dpdlbuf_var1")
println("response buffer: "  + buf)
println("")

println("embedding javascript...")
int val = 23
arr[] = [1, 2, 3, 4]

dpdl_stack_push(val, arr)
>>js
console.log('Dpdl sends a message with js');
var sa;
var arr;
var v;
if(scriptArgs.length > 1){
	v = scriptArgs[0];
	sa = scriptArgs[1];
	arr = sa.split(",");
	std.printf("val=%d\n", v);
	console.log(arr);
}else{
	sa = "";
}

for(let i = 0; i < arr.length; i++)  {
	std.printf("arr[%d]=%d\n", i, arr[i]);
}
<<
int js_exit_code = dpdl_exit_code()
println("embedded javascript exit code: "  + js_exit_code);

Supported Platforms

Dpdl runs on a wide range of platforms and includes also a small footprint kilobyte range java virtual machine that can be compiled for almost every platform as soon as an ANSI C compiler is available for the target platform.

‘DpdlEngine’ is compatible with:

So far DpdlEngine V1.0 has been tested on:

Roadmap

Dpdl is currently developed by SEE Solutions and the following integrations are in development:

Documentation

The DpdlEngine and Dpdl API documentation are available via the following links:

Dpdl language quick Tour

Dpdl Documentation

Dpdl API Documentation

Dpdl ‘embedded code sections’ (Dpdl language plug-ins)

Dpdl compiler documentation

Dpdl Native Interface

Dpdl GPU Compute

Dpdl Wasm runtime

Dpdl Meta-programming

Dpdl Agents

DpdlVM

DpdlAINerd

DpdlPacket

DpdlClient

More…

Dpdl Examples

Dpdl HowTo’s

Dpdl Tutorials

Visit also the official Dpdl-io repository on GitHub for updates: DpdlEngine

Dpdl sample code

Dpdl-sample-Apps

Full featured prototype applications developed with Dpdl are published on this GitHub repository:

Dpdl-sample-Apps

Dpdl example with embedded ‘C++’ code that make use of the ROOT framework libraries

C++ code can be embedded within Dpdl with the keyord ‘>>cpp’

The following dpdl example makes use of an embedded code section in C++ that uses libraries from the the powerful ROOT Data Analysis Framework developed by CERN (https://root.cern/) .

Example Dpdl code embedding C++ code that make use of ‘ROOT’ libs:
Dpdl ROOT example

# main
println("test embedded C++ code that make use of ROOT libs...")

>>cpp
auto canvas = new TCanvas("c","Graph2D example",0,0,700,600);

double x, y, z, P = 6.;
int np = 200;
auto dt = new TGraph2D();
auto r = new TRandom();
for (int N=0; N<np; N++) {
	x = 2*P*(r->Rndm(N))-P;
	y = 2*P*(r->Rndm(N))-P;
	z = (sin(x)/x)*(sin(y)/y)+0.2;
	dt->SetPoint(N,x,y,z);
}
dt->Draw("tri1 p0");
canvas->Modified(); canvas->Update();
<<

int exit_code = dpdl_exit_code()
println("embedded ROOT exit code: " + exit_code)

Sample Dpdl code that make use of type ‘class’ Inheritance and Polymorphism

Note: Some functions in this case make also use of ‘embedded code sections’ in other programming languages

The following simple Dpdl example shows how the type class can make use of Inheritance and Polymorphism. Some functions in this example make use of embedded code sections implemented in ‘Java’ and ‘C’

Here is the link for the full Dpdl code of the example that is summarized below:

test/testClassSub2.h

struct property {
	int max_weight_gr
	float max_height_m
	string desc = null
}

class Animal {
	int id
	string name
	struct property info = {100000, 2.5,.}

	func Animal(int id_)
		id = id_
		name = "No name"
		
		println("new Animal() with id: " + id + " info: " + info)
	end

	func Animal(int id_, string name_)
		id = id_
		name = name_
		
		println("new Animal() with id: " + id + " and name: " + name + " - info: " + info)
	end

	func print()
		println("This is an Animal")
	end

	func makeSound()
		println("kind of animal is not defined")
	end

  func getHashMap()
		object h_map = new("HashMap")
		
		info_arr[] = array(info)
		int i = 0
		for(i < info_arr.size())
			h_map.put(i, info_arr[i])
			i=i+1
		endfor
		
		return h_map
	end
}

class Dog : Animal {

	func Dog(int id_, string name_)
		super(id_, name_)
		
		info.max_weight_gr = 8000
		info.max_height_m = 0.5
		info.desc = "this breed is Shitzu"
		
		println("new Dog() with id: " + id + " and name: " + name + " - info: " + info)
	end

	func print()
		println("This is a Dog with name: " + name)
	end
	
	func makeSound()
		...
		// check link above for complete implementation of this example

// now we can use the class

class Dog mydog(2, "Rosa")

mydog.print()
mydog.makeSound()
int  sd = mydog.makeSound(10)

object map_dog = mydog.getHashMap()
println("map dog: " + map_dog)

var entry_di = map_dog.get(0)
println("1st entry: " + entry_di + " is of type: " + typeof(entry_di))

...

Compress and decompress data using the Java JRE Platform API

Dpdl example that uses java.util.GZIP* classes to compress and de-compress data

# main
object str = new("String", "my data to compress")
println("string to compress: " + str)

object byte_out = new("ByteArrayOutputStream")
object zip_out = new("GZIPOutputStream", byte_out)

println("compressing...")
zip_out.write(str.getBytes("UTF-8"))
zip_out.close()
println("data compressed successfully!")

object compressed_str = byte_out.toString()
println("compressed string: " + compressed_str)

println("decompressing...")
object byte_in = compressed_str.getBytes("UTF-8")
object byte_arr_in = new("ByteArrayInputStream", byte_in)
object byte_arr_in_obj = cast(byte_arr_in)
object zip_in = new("GZIPInputStream", byte_arr_in_obj)

object in_reader = new("InputStreamReader", zip_in)
object buf_reader = new("BufferedReader", in_reader)

string decompressed_str = ""
string line = ""
while(line != null)
	line = buf_reader.readLine()
	if(line != null)
		decompressed_str = decompressed_str + line
	fi
endwhile

println("decompressed: " + decompressed_str)

Bluetooth device discovery

Example Dpdl code that performs Bluetooth device discovery using high level Dpdl BT API :

int status = DPDLAPI_searchClientsOnServer()
int status_discovery = dpdlFalse
int service_discovery = dpdlFalse
int counter = 0
if(status == dpdlTrue)
	while (status_discovery != dpdlTrue) && (service_discovery != dpdlTrue)
		status_discovery = DPDLAPI_discoveryServerFinished()
		service_discovery = DPDLAPI_serviceDiscoveryServerFinished()
		print(".")
		counter = counter+1	
		sleep(3000)
	endwhile
	
	string dev = "n"
	int dev_found = 0
	while(dev != "null")
		dev = DPDLAPI_getServerVisibleBTAddr()
		if(dev != "null")
			println("bluetooth device visible: " + dev)
			saveData(dev)
			dev_found = dev_found + 1
		fi
	endwhile
else
	println("No working Bluetooth stack found")
fi

Embedding of Python code

Python code can be embedded within Dpdl script by using the keyword ‘>>python’.

Example Dpdl script with embedded ‘Python’ code:

println("testing embedding python code wihin Dpdl")
println("")

>>python
languages = ['Dpdl', 'C', 'Python', 'OCaml']
for language in languages:
	print(language)
<<
# again Dpdl
println("")
int exit_code = dpdl_exit_code()
println("ebedded python exit code: " + exit_code);

Embedding C code

Dpdl allows the embedding and on-the-fly compilation and execution of C code directly within Dpdl code.

The C code can be embedded and executed with 2 distinct Modes, either interpreted only OR compiled and executed in memory at runtime.

The two modes have distinct properties: The interpreted C code execution is for example more convenient for testing, small footprint and portability, while the compiled C code execution is more convenient for faster execution and for linking with external libraries.

The execution of C code is driven by a native Dpdl library that has a small footprint and for the interpreted mode it includes all essential C libraries and language constructs (ISO standard C90), POSIX compliant) with no external library dependencies needed. Custom libraries and functions can be integrated and linked via a straight forward implementation configuration approach.

Dpdl example with embedded C code (interpreted):

# main
# starting with Dpdl, pushing parameters on the stack and embedding C code

println("testing embedded C code in Dpdl")
int n = 6
double x = 10.0
string a = "test"
dpdl_stack_push(n, x, a)
>>c
#include <stdio.h>

int dpdl_main(int argc, char **argv){
	printf("Hello C from Dpdl!\n");
	printf("\n");
	printf("num params: %d\n", argc);
	int cnt;
	for (cnt = 0; cnt < argc; cnt++){
		printf(" param %d: %s\n", cnt, argv[cnt]);
	}
	return 0;
}
<<
# again Dpdl...
int exit_code = dpdl_exit_code()
println("embedded C exit code: " + exit_code);

object str = new("String", "Dpdl embedded C")
bool b = str.contains("C")
println("Dpdl contains C: " + b)

This is a more complete example of the usage of embedded C code within Dpdl:

dpdlEmbeddedC.h

Embedding of ‘Julia’

Julia is a powerful and performant computational programming language (https://julialang.org)

Julia code can be embedded within Dpdl via the keyord ‘>>julia’

Example Dpdl script embedding ‘Julia’ that generates a Plot and saves it as PDF:

Dpdl ROOT example

#main
println("Testing Plot data with Julia programming language...")

>>julia
using Plots

x = range(0, 10, length=100)
y1 = sin.(x)
y2 = cos.(x)
p = plot(x, [y1 y2])

savefig(p, "./Test/myplot.pdf")

dispose_status = @ccall dpdl_julia_dispose()::Int32
return 1
<<

int exit_code = dpdl_exit_code()
println("finished with exit code: " + exit_code)

Other programming languages

Other programming languages or natural language interpreters can be easily integrated in Dpdl via a dedicated plug-in interface and configuration in form of ‘Dpdl language plug-ins’. Please feel free to suggest yours favorite language on the Discussion section on the DpdlEngine GitHub repository.

More Examples

Dpdl_Examples.md

Request free trial ‘DpdlEngine lite’

The ‘DpdlEngine lite’ release can be requested as Trial Shareware (with some limitation/restrictions) at the following request form:

Download Request Form

The ‘DpdlEngine pro’ instead is available with custom licensing models only.

How to buy a ‘full’ DpdlEngine license?

To buy a full featured ‘DpdlEngine lite’ license with no limitations/restrictions, regular updates and support, please submit your request via the following request form:

Order Request Form

For custom requirements or a bulk reseller license write an e-mail to the contact address.

Contact

e-mail: info@dpdl.io