ChaiScript/ChaiScript

Embedded Scripting Language Designed for C++

Jason Turner

@lefticus

Good, then keep using your LLVM-Clang integration solution, it sounds like the perfect option for you

Za Ra Sa Ha

@Zrasha_gitlab

Chaiscript is also much slower than even the non-Jitted LUA.. You have a very, very low quality codebase

Jason Turner

@lefticus

We're always looking for contributors who can increase the quality and performance of the code. While maintaining the same flexibility, correctness, and crossplatform capability. So if you do go to add a contribution please make sure it can still work on ARM/i386/x86_64/MSVC/GCC/Clang/Libc++/libstdc++/Windows/Linux/MacOS/Haiku

frankturley

@frankturley

I am looking for a way to format numbers in a print statement in Chaiscript

Rob Loach

@RobLoach

@frankturley to_string() will port numbers to strings, but I'm unsure there's a native number_format() method. Feel free to consider adding one to https://github.com/chaiscript/chaiscript_extras .

frankturley

@frankturley

I was looking for an equivalent to Basic's Print Using, where for example Print Using "##.##"; 10.222 would output 10.22 - sorry I haven't a clue how to create this.

Rob Loach

@RobLoach

@frankturley ChaiScript supports template literals.....
var num = 10.222
print("Something: ${num}")

frankturley

@frankturley

My problem is that I am reading a variable which has 6 places of decimals, I would like to print it as a whole number.

Arthur Brainville

@Ybalrid

You can probably use a floor or ceil function. Or give a function int to_int(double n) { return n; } to your chai script engine from the C++ side ?

And you just use it when printing

frankturley

@frankturley

The host application is the property of another party. They allow access to its variables via ChaiScript files, which are called by the host. One of these variables holds miles per hour, and I would prefer to show this to the user as a round number, rather than the value as held by the host which has six decimal places.

Gibbon99

@Gibbon99

Hi - I've got an issue that I don't understand - hoping to get some insight into what I am doing wrong. I have a chai script with two functions - both exactly the same, I can call the first one fine, but the second one silently fails. I run .eval on the script first, then have a function containing this line "chaiInstance.eval<std::function<void ()>>(functionName);" - it only seems to work on the one function call ie: chai_runFunction("scriptFunc"); - and does nothing calling "chai_runFunction("printFromScript");". this is the script: def scriptFunc()
{
testGlobalVar = 555;
}

def printFromScript()
{
testGlobalVar = 9999;
}

Germán Diago

@germandiagogomez

Hello. I have been using ChaiScript for a while.

I did not find any problem with its speed for my use cases

but I am still wondering

if a speed boost could be achieved

making all the methods, etc.

being resolved in a different way

I think that currently, ChaiScript is using strings

for things that are immutable most of the time (method names, etc.)

wouldn't it be more effective to use some kind of immutable string and/or hashing for method resolution? Not sure, though, if this can be done. I do not know the design deeply

As commented, for my use cases speed has not been a problem, though speed is something that is always good to have, specially in games, since the more speed you have, the more scripted code you can do

My real pain point (and this was a real one, not in theory) is the lack of some kind of stackful coroutines compared to Lua and Python.

Martin Chang

@marty1885

I fully agree that compiling ChaiScript is show. (It's my main problem with it)

@germandiagogomez Before C++20 get there you could try zapcc as your compiler. It shoule be way faser.

Germán Diago

@germandiagogomez

No, my complain was not about compile-times actually @marty1885

Germán Diago

@germandiagogomez

Hello everyone again. Would like to know... is it possible to invoke a function from a script that creates a std::thread? It seems to crash in my setup.

Germán Diago

@germandiagogomez

the error was somewhere else :)

vocaviking

@vocaviking

Hi, I'm trying to import chaiscript using cmake, but I can't get the header files to work properly. Right now I'm doing it this way:

cmake_minimum_required(VERSION 3.1...3.11)

project(ace VERSION 5.0.0)

...

add_subdirectory(lib/ChaiScript/)
target_link_libraries(ace PRIVATE chaiscript)

What do I have to do to make this compile?

Arthur Brainville

@Ybalrid

I use either include_directoires or target_include_directories for Chai. As it’s just a folder with a bunch of headers. Therés nothing to link against

« Link libraries » functions are for linking to .a, .lib, .so filles to your target. Nothing to do with headers.

vocaviking

@vocaviking

Sure. However, that's the recommendation I found for including proper cmake projects... add_subdirectory and link against it

This helps you to include chaiscript into several projects depending on it, without duplicating the code. (Something I actually would need.)

StanEpp

@StanEpp

I do it in my project like this:
Add an external_project
https://github.com/StanEpp/ChaiDwarfs/blob/master/deps/CMakeLists.txt#L221

Just add it as a dependency to the project
https://github.com/StanEpp/ChaiDwarfs/blob/master/CMakeLists.txt#L115

As @Ybalrid already said there's nothing to link against. You just include the header files and are good to go.

I hope the code helps. Unfortunately I haven't touched the project in a while

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"));

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