Deamer String Template

Concept

DST is a DSL to parse templates, you can use these templates to easily generate code. The DSL will be available via a library created using Deamer.

Aside from using DST to parse at runtime, DST is also able to generate C++ classes to generate the specific files. This gives the user even more flexibility, when generating files.

Installing DST

DST depends on the external library of Deamer CC, so it is required to install Deamer External.

Instructions on how to install Deamer External can be found here: https://github.com/Deruago/DeamerExternal.

Installing DST for Linux

Getting the source code

git clone https://github.com/Deruago/DeamerStringTemplate
cd DeamerStringTemplate

Creating a build directory

mkdir build
cd build

Building and installing DST

cmake ..
sudo cmake --build . --target install

Examples

Creating the file:

This is the main template file, DST will parse this and create an internal structure.

#ifndef {{header_guard}}
#define {{header_guard}}

namespace {{language_name}} { namespace ast { namespace {{ast_name}} {
    class {{ast_name}} : public {{language_name}} {{base_names}}
    {
    private:
        Value* value;
    public:
    	{{ast_name}}(Value* value_);
    	~{{ast_name}}() override = default;
    
    public:
    	const Value* GetValue() const;
    }
}}}

#endif // {{header_guard}}

Creating the settings file:

This file is optional, it can be used to:

• Make abstractions
• Specify common operations

{{file.file_name}} = {{ast_name}}.h

{{header_guard}} = {{language_name.Upper}}_AST_NODE_{{ast_name.Upper}}_H	/ abstraction

Parsing the template:

This c++ code, uses DST to parse and implement the varies parameters.

#include <DST/User/ConstructionGenerator.h>
#include <string>

int main()
{
    auto* const generator = user::ConstructionGenerator().GenerateConstructionFromPath(
        "./template.dst",
        "./template.setting.dst"
    );
    
    std::string lang_name = "Test";
    std::string ast_name = "TestNode";
    
    std::string output = generator->Output(
        {
            {"language_name", "", lang_name},
            {"ast_name", "", ast_name}
        }
    );
    
    std::cout << output << std::endl;
    
    delete generator;
    
    return 0;
}

Example repo

For more examples visit the example repo.

Using DST to generate a C++ file

DST is also capable of generating C++ files, to implement the the code generation with.

To generate such C++ file, first install the DST program using the "install" target of CMake.

After this run DST as follows:

DST ./templatepath.dst ./template_settings_path.setting.dst

If everything was correctly executed you will see an header file. You can now use this header file for code generation.