FEX-Emu--FEX/ThunkLibs/Generator/diagnostics.h

#pragma once

#include <clang/AST/ASTContext.h>
#include <clang/Basic/Diagnostic.h>
#include <clang/Basic/SourceLocation.h>

#include <utility>
#include <vector>

struct ClangDiagnosticAsException {
  std::pair<clang::SourceLocation, unsigned> diagnostic;

  std::vector<ClangDiagnosticAsException> notes;

  // List of callbacks that add an argument to a clang::DiagnosticBuilder
  std::vector<std::function<void(clang::DiagnosticBuilder&)>> args;

  ClangDiagnosticAsException& AddString(std::string str) {
    args.push_back([arg = std::move(str)](clang::DiagnosticBuilder& db) { db.AddString(arg); });
    return *this;
  }

  ClangDiagnosticAsException& AddTaggedVal(clang::QualType type) {
    args.push_back([val = type](clang::DiagnosticBuilder& db) {
      db.AddTaggedVal(reinterpret_cast<uintptr_t>(val.getAsOpaquePtr()), clang::DiagnosticsEngine::ak_qualtype);
    });
    return *this;
  }

  ClangDiagnosticAsException& addNote(ClangDiagnosticAsException diagnostic) {
    notes.push_back(std::move(diagnostic));
    return *this;
  }

  void Report(clang::DiagnosticsEngine& diagnostics) const {
    {
      auto builder = diagnostics.Report(diagnostic.first, diagnostic.second);
      for (auto& arg_appender : args) {
        arg_appender(builder);
      }
    }
    for (auto& note : notes) {
      note.Report(diagnostics);
    }
  }
};

// Helper class to build a custom DiagID from the given message and store it in a throwable object
struct ErrorReporter {
  clang::ASTContext& context;

  template<std::size_t N>
  [[nodiscard]]
  ClangDiagnosticAsException
  operator()(clang::SourceLocation loc, const char (&message)[N], clang::DiagnosticsEngine::Level level = clang::DiagnosticsEngine::Error) {
    auto id = context.getDiagnostics().getCustomDiagID(level, message);
    return {std::pair(loc, id)};
  }
};