carbon-lang/toolchain/diagnostics/file_diagnostics.h

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#ifndef CARBON_TOOLCHAIN_DIAGNOSTICS_FILE_DIAGNOSTICS_H_
#define CARBON_TOOLCHAIN_DIAGNOSTICS_FILE_DIAGNOSTICS_H_

#include "toolchain/diagnostics/diagnostic_emitter.h"

namespace Carbon {

// We frequently want a `DiagnosticEmitter` that directly uses a filename. Note
// that an empty string can be used for a diagnostic that has no particular
// location.
//
// Note this provides no way to set a line or column on diagnostics. More
// specific emitters must be used for that.
class FileDiagnosticEmitter : public DiagnosticEmitter<llvm::StringRef> {
 public:
  explicit FileDiagnosticEmitter(DiagnosticConsumer* consumer)
      : DiagnosticEmitter<llvm::StringRef>(converter_, *consumer) {}

 private:
  // Converts a filename directly to the diagnostic location.
  struct FileDiagnosticConverter : DiagnosticConverter<llvm::StringRef> {
    auto ConvertLoc(llvm::StringRef filename, ContextFnT /*context_fn*/) const
        -> ConvertedDiagnosticLoc override {
      return {.loc = {.filename = filename}, .last_byte_offset = -1};
    }
  };

  FileDiagnosticConverter converter_;
};

}  // namespace Carbon

#endif  // CARBON_TOOLCHAIN_DIAGNOSTICS_FILE_DIAGNOSTICS_H_