// 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_SORTING_DIAGNOSTIC_CONSUMER_H_
#define CARBON_TOOLCHAIN_DIAGNOSTICS_SORTING_DIAGNOSTIC_CONSUMER_H_
#include "common/check.h"
#include "llvm/ADT/STLExtras.h"
#include "toolchain/diagnostics/diagnostic_emitter.h"
namespace Carbon::Diagnostics {
// Buffers incoming diagnostics for printing and sorting.
//
// Sorting is based on `last_byte_offset` without taking the filename into
// account. When processing multiple files, it's expected that separate
// consumers will be used in order to keep diagnostics distinct. Typically
// `Diagnostic::messages[0]` will always be a location in the consumer's primary
// file, but if it needs to correspond to a different file, the
// `last_byte_offset` must still indicate an offset within the primary file.
class SortingConsumer : public Consumer {
 public:
 explicit SortingConsumer(Consumer& next_consumer)
 : next_consumer_(&next_consumer) {}
 ~SortingConsumer() override {
 // We choose not to automatically flush diagnostics here, because they are
 // likely to refer to data that gets destroyed before the diagnostics
 // consumer is destroyed, because the diagnostics consumer is typically
 // created before the objects that diagnostics refer into are created.
 CARBON_CHECK(diagnostics_.empty(),
 "Must flush diagnostics consumer before destroying it");
 }
 // Buffers the diagnostic.
 auto HandleDiagnostic(Diagnostic diagnostic) -> void override {
 diagnostics_.push_back(std::move(diagnostic));
 }
 // Sorts and flushes buffered diagnostics.
 auto Flush() -> void override {
 llvm::stable_sort(diagnostics_,
 [](const Diagnostic& lhs, const Diagnostic& rhs) {
 return lhs.last_byte_offset < rhs.last_byte_offset; }); for (auto& diag : diagnostics_) { next_consumer_->HandleDiagnostic(std::move(diag));
 }
 diagnostics_.clear();
 }
 private:
 // A Diagnostic is undesirably large for inline storage by SmallVector, so we
 // specify 0.
 llvm::SmallVector<diagnostic, 0> diagnostics_;
 Consumer* next_consumer_;
};
} // namespace Carbon::Diagnostics
#endif // CARBON_TOOLCHAIN_DIAGNOSTICS_SORTING_DIAGNOSTIC_CONSUMER_H_
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