driver.h

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#pragma once
 
#include <sstream>
#include <string_view>
 
#include <fe/format.h>
#include <fe/loc.h>
#include <fe/sym.h>
 
namespace fe {
 
/// Use/derive from this class for "global" variables that you need all over the place.
/// Well, there are not really global - that's the point of this class.
/// Right now, it manages a SymPool (by inherting from it) and offers `std::format`-based diagnostics.
struct Driver : public SymPool {
public:
    /// @name Diagnostics
    ///@{
    template<class... Args> static void note(Loc loc, format::format_string<Args...> fmt, Args&&... args) {
        std::cerr << loc << ": note: " << format::format(fmt, std::forward<Args&&>(args)...) << std::endl;
    }
    template<class... Args> void warn(Loc loc, format::format_string<Args...> fmt, Args&&... args) {
        ++num_warnings_;
        std::cerr << loc << ": warning: " << format::format(fmt, std::forward<Args&&>(args)...) << std::endl;
    }
    template<class... Args> void err(Loc loc, format::format_string<Args...> fmt, Args&&... args) {
        ++num_errors_;
        std::cerr << loc << ": error: " << format::format(fmt, std::forward<Args&&>(args)...) << std::endl;
    }
 
    unsigned num_errors() const { return num_errors_; }
    unsigned num_warnings() const { return num_warnings_; }
    ///@}
 
private:
    unsigned num_errors_   = 0;
    unsigned num_warnings_ = 0;
};
 
} // namespace fe