IDL_Print.cpp

This is an example of how to use IDL_FrontEnd class.

// IDL_Print.h Demonstrates the IDL compiler class.
#ifndef NIDLFE_EXAMPLE_IDL_PRINT_H_
#define NIDLFE_EXAMPLE_IDL_PRINT_H_
 
#if __cplusplus < 201703L && _MSVC_LANG < 201703L
#error C++17 compliant compiler is required.
#endif
 
#include <IDL_FrontEnd.h>
#include <filesystem>
 
// Derive the compiler class from IDL_FrontEnd.
class IDL_Print : public IDL_FrontEnd
{
public:
    IDL_Print () :
        IDL_FrontEnd (IDL_FrontEnd::FLAG_ENABLE_CONST_OBJREF)
    {}
 
private:
    // Override print_usage_info for additional usage information.
    virtual void print_usage_info (const char* exe_name) override;
 
    // Override parse_command_line to parse own command line switches.
    virtual bool parse_command_line (CmdLine& args) override;
 
    // Override generate_code to build output from the AST.
    virtual void generate_code (const AST::Root& tree) override;
 
private:
    std::filesystem::path out_dir_;
};
 
#endif

// IDL_Print.cpp Demonstrates the IDL compiler class.
#include "IDL_Print.h"
#include "Printer.h"
#include <iostream>
 
using namespace std;
using namespace std::filesystem;
 
void IDL_Print::print_usage_info (const char* exe_name)
{
    cout << "Compile and print IDL.\n";
    IDL_FrontEnd::print_usage_info (exe_name);
    cout << "Output options:\n"
        "\t-d directory\tDirectory for output files.\n";
}
 
bool IDL_Print::parse_command_line (CmdLine& args)
{
    if (IDL_FrontEnd::parse_command_line (args))
        return true;
 
    if (args.arg () [1] == 'd') {
        out_dir_ = args.parameter (args.arg () + 2);
        assert (!out_dir_.empty ());
        args.next ();
        return true;
    }
    return false;
}
 
void IDL_Print::generate_code (const AST::Root& tree)
{
    path file = out_dir_ / tree.file ().filename ();
    file.replace_extension (".txt");
    Printer printer (file);
    if (tree.visit (printer))
        cerr << "Warning, some unsupported Building Blocks were ignored.\n";
}