Grimoire is a simple and fast concurrent programming language that can easily be embedded into another D programs. You can very easily interface your program with Grimoire's scripts.

Hope you have fun with this project !

Documentation here !

There is a VSCode extension for Grimoire available here: grimoire-lang

What it looks like:

//Hello World
event app {
    "Hello World!".print;
}

//Invert a string
event app {
    assert("Hello World !".invert == "! dlroW olleH");
}

func invert(str: string) (string) {
    let result = str as<list<string>>;
    loop(i, result.size / 2)
        result[i], result[-(i + 1)] = result[-(i + 1)], result[i];
    return result as<string>;
}

//Fibonacci
event fib {
    assert(
        function(n: int) (int) {
            if(n < 2) return n;
            return self(n - 1) + self(n - 2);
        }(10) == 55);
}

Install

Use dub to include grimoire in your project (or just dump the files in your project if you want). Open the "test" folder to see how to add Grimoire to your program or copy/paste it.

Grimoire is in 2 parts:

• The compiler
• The runtime

Compilation

To bind functions defined in D and add other types, you can create a GrModuleDef which will store primitives and type information. The GrModuleDef object can be shared between multiple compilations.

To compile, you need a compiler GrCompiler which will turn your scripts into bytecode with compile.

You must add the GrModuleDef objects to the compiler before calling compile with addLibrary. You must also add at least one file or source to compile with addFile or addSource before compiling (further files can be added with import directives). If the compilation fails, you can fetch the error with getError().

If it's successful, the compile function will returns a GrBytecode that stores the bytecode generated by the compiler, which can be saved into a file or run by the VM.

// Some basic functions are provided by the default library.
GrModuleDef stdlib = grLoadStdLibrary(); 

GrCompiler compiler = new GrCompiler;

// We add the default library.
compiler.addLibrary(stdlib);

// We provide an entry script
compiler.addFile("script.gr");

// We compile the file.
GrBytecode bytecode = compiler.compile();

if(bytecode) {
    // Compilation successful
}
else {
    // Error while compiling
    import std.stdio: writeln;
    writeln(compiler.getError().prettify());
}

Debug & Profiling

You can see the generated bytecode with

bytecode.prettify();

Which formats the bytecode in a printable way.

Grimoire also provide a basic profiling tool, to use it, to need to specify a flag during compilation to activate debug informations.

compiler.compileFile("test.gr", GrOption.Option.profile | GrOption.Option.symbols | GrOption.Option.safe);

• profile adds profiling commands to the bytecode
• symbols generate debug information into the bytecode
• safe adds additional checks that can help detect some crashes

The profiling information are accessible on the GrEngine with:

engine.dumpProfiling();

An already formatted version is accessible with:

engine.prettifyProfiling();

Processing

Then, create the runtime's virtual machine GrEngine, you'll first need to add the same libraries as the compiler and in the same order. Then, load the bytecode.

GrEngine engine = new GrEngine;
engine.addLibrary(stdlib);
engine.load(bytecode);

You can then spawn any event like this:

GrTask task = engine.callEvent("myEvent", [grString], [GrValue("Hello World!")]);

To run the virtual machine, just call the process function (and check if there's any task(Coroutine) currently running):

while(engine.hasTasks)
    engine.process();

The program will run until all tasks are finished, if you want them to run only for one step, replace the while with if.

You can then check if there are any unhandled errors that went through the VM (Caught exceptions won't trigger that).

if(engine.isPanicking) {
    writeln("unhandled exception: " ~ engine.panicMessage);
   
    foreach (trace; engine.stackTraces) {
        writeln("[", trace.pc, "] in ", trace.name, " at ", trace.file,
            "(", trace.line, ",", trace.column, ")");
    }
}

Documentation

You can find the language documentation > here ! <

Extension

There is a VSCode extension for Grimoire available here: grimoire-lang