ChaiScript/ChaiScript

Embedded Scripting Language Designed for C++

Oliver Dain

@oliverdain

Hey - just posted a question on the forums (http://discourse.chaiscript.com/t/chaiscript-array-of-objects-without-copy-constructor/415) and then discovered there's a chat channel too! Hoping I can get a quicker answer here as I'm kinda stuck right now. Any help would be greatly appreciated.

vocaviking

@vocaviking

@StanEpp This part I did using git submodules, it works fine.

vocaviking

@vocaviking

My problem is, that I have something like:

ace/
    lib/
        chaiscript/
        spdlog/
        libA/  --> uses chaiscript and spdlog
        libB/  --> uses chaiscript and spdlog
    src/
        main.cpp  --> uses libA and libB
    CMakeLists.txt

How can I do this using cmake? In the case of other header-only libraries like spdlog, I simply write the following project file:

    cmake_minimum_required(VERSION 3.1...3.11)
    project(ace VERSION 5.0.0)
    add_subdirectory(lib/spdlog/)
    target_link_libraries(ace PRIVATE libA)
    target_link_libraries(ace PRIVATE libB)

And inside the libraries I have:

    cmake_minimum_required(VERSION 3.1...3.11)
    project(libA VERSION 1.0.0)
    target_link_libraries(libA PRIVATE spdlog)

Rob Loach

@RobLoach

Having a CMakeLists.txt for each folder makes your life easier. I hope to clean up some of the cmake build system in extras as an example.

vocaviking

@vocaviking

That's what I did... Writing a custom CMakeLists.txt for Chaiscript. I would like to make a pull request, but I don't really know how to replace the existing one...

Arthur Brainville

@Ybalrid

Chaiscript being trader only. I never feeler the need of having to get CMake to find it i generally just set it as one of the include directories. Either on the cmake target, or even globally. I either have it copied somewhere, or included via a git submodule

Rich Henry

@phaistos

is the any example of returning a std::vector<int>, particularly what bindings are required?

im getting a dispatch error when i try to call .size() on it

Rob Loach

@RobLoach

@phaistos Might have to let ChaiScript know about the vector type?

chai.add(bootstrap::standard_library::vector_type<std::vector<int>>("VectorInt"));

Addison Schuhardt

@aschuhardt

@RubenReijers yes it does. But it was only added to the develop branch recently. You can do the following when TerrainType is an enum class:
chaiscript::ModulePtr m = chaiscript::ModulePtr(new chaiscript::Module());
chaiscript::utility::add_class<TerrainType>(*m, 
  "TerrainType", 
  { { TerrainType::SOIL, "SOIL" },
    {TerrainType::PASSABLE, "PASSABLE"},
    { TerrainType::STONE, "STONE" }
  }
);

Is it still possible to use enum classes this way in the current development branch?

I've tried this same method as follows:

  auto key_module = std::make_shared<chaiscript::Module>();
  chaiscript::utility::add_class<Key>(
      *key_module, "Key",
      {
          {Key::N0, "KEY_N0"},
          {Key::N1, "KEY_N1"},
          {Key::N2, "KEY_N2"},
          {Key::N3, "KEY_N3"},
          {Key::N4, "KEY_N4"},
...

I'm not sure how I'm supposed to access these values however.

I've tried

  var k = Key();
  print(k.KEY_N0);

But I get the error message

terminate called after throwing an instance of 'chaiscript::exception::eval_error'
  what():  Error: "Error with function dispatch for function 'to_string'" With parameters: (Key).()

trying to access the class's attr by value var x = k.KEY_N0; throws another error

Error: "'KEY_N0' is not a function."

Maybe I'm misunderstanding what the add_class utility is supposed to be doing?

Addison Schuhardt

@aschuhardt

var k = Key.KEY_N0 throws this error:
Error: "Error with function dispatch for function 'KEY_N0'" With parameters: (const Function).(string)

What am I missing?

Addison Schuhardt

@aschuhardt

Welp. Figured it out. It adds global(?) constants. This works:

var k = KEY_N0;

in case anyone has the same question

Sam Jeeves

@jeevcat

What's the difference currently between the vs2019 fixes and the develop branches right now? Which is more current?

Vladyslav

@0xd800

chaiscript::exception::global_non_const If t_bv is not a constant object

Does it mean that t_bv should be const-qualified or just that I shouldn't ever modify it?
Moreover,

ChaiScript_Basic& chaiscript::ChaiScript_Basic::add_global_const     (     const Boxed_Value &      t_bv,
        const std::string &      t_name 
    )

it is const& in signature.
I am confused. Can someone elaborate?

Stefan Agartsson

@Zephyrox_twitter

I would like to create some form of code completion in my script editor. Is there a way to get all classes and methods I've registered with chaiscript?

GrahamAsher

@GrahamAsher

I don't understand the distinction between the normal and the static-library versions of ChaiScript. I watched Jason's Intro To ChaiScript video, which showed him compiling normally in Linux, getting a library load error, then correcting the error by compiling using the static-lib constructor argument; but when I try a simple example using the normal version in Windows, it works correctly without the need to create any dynamically loaded library. Here's my sample code, which includes the main chaiscript header and adds no other chaiscript source code files:

include <chaiscript/chaiscript.hpp>

...

auto hello = [](const std::string& aName)->std::string
    {
    return "Hello " + aName;
    };
chaiscript::ChaiScript chai;
chai.add(chaiscript::fun(hello),"hello");
chai.eval("puts(hello(\"Graham\"))");

So I assume there's a difference between the way this library-loading system works under Windows and on other platforms. It would be great to have an explanation.

curtiplas

@curtiplas

So I'm working with a product that utilizes chaiscript (not embeddded within C++); and I'm curious if chaiscript supports any manipulation of strings ( such as a function/method to search a string for a specific char and/or splitting a string into multiple strings)?

vocaviking

@vocaviking

@0xd800 Going by the documentation, t_bv has to be constant! See:

chai.add_global_const(chaiscript::const_var(somevar), "somevar"); // global const. Throws if value is non-const, throws if object exists

I haven't checked the internals, but I think constness is required because ChaiScript does some performance optimization on these variables, which it cannot do if you want the value to change during evaluation...

vocaviking

@vocaviking

@curtiplas ChaiScript supports some string functions via the Extras library However, it probably not enough for the average string tasks. You will need to either hook up the STL into ChaiScript, or write your own functions.

alanyangbo

@alanyangbo

Translate chai into c++

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include <chaiscript/chaiscript.hpp>