//===--- ModuleDiagsConsumer.cpp - Print module differ diagnostics --*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
//  This file implements the ModuleDifferDiagsConsumer class, which displays
//  diagnostics from the module differ as text to an output.
//
//===----------------------------------------------------------------------===//

#include "swift/AST/DiagnosticEngine.h"
#include "swift/AST/DiagnosticsModuleDiffer.h"
#include "ModuleDiagsConsumer.h"

using namespace swift;

namespace {
// Reproduce the DiagIDs, as we want both the size and access to the raw ids
// themselves.
enum LocalDiagID : uint32_t {
#define DIAG(KIND, ID, Options, Text, Signature) ID,
#include "swift/AST/DiagnosticsAll.def"
  NumDiags
};

static StringRef getCategoryName(uint32_t ID) {
  switch(ID) {
  case LocalDiagID::removed_decl:
  case LocalDiagID::removed_setter:
    return "/* Removed Decls */";
  case LocalDiagID::moved_decl:
  case LocalDiagID::decl_kind_changed:
    return "/* Moved Decls */";
  case LocalDiagID::renamed_decl:
    return "/* Renamed Decls */";
  case LocalDiagID::decl_attr_change:
  case LocalDiagID::decl_new_attr:
  case LocalDiagID::var_let_changed:
  case LocalDiagID::func_self_access_change:
    return "/* Decl Attribute changes */";
  case LocalDiagID::default_arg_removed:
  case LocalDiagID::decl_type_change:
  case LocalDiagID::func_type_escaping_changed:
  case LocalDiagID::param_ownership_change:
  case LocalDiagID::type_witness_change:
    return "/* Type Changes */";
  case LocalDiagID::raw_type_change:
    return "/* RawRepresentable Changes */";
  case LocalDiagID::generic_sig_change:
    return "/* Generic Signature Changes */";
  case LocalDiagID::decl_added:
  case LocalDiagID::decl_reorder:
  case LocalDiagID::var_has_fixed_order_change:
  case LocalDiagID::func_has_fixed_order_change:
    return "/* Fixed-layout Type Changes */";
  case LocalDiagID::conformance_added:
  case LocalDiagID::conformance_removed:
  case LocalDiagID::optional_req_changed:
    return "/* Protocol Conformance Change */";
  case LocalDiagID::default_associated_type_removed:
  case LocalDiagID::protocol_req_added:
  case LocalDiagID::decl_new_witness_table_entry:
    return "/* Protocol Requirement Change */";
  case LocalDiagID::super_class_removed:
  case LocalDiagID::super_class_changed:
  case LocalDiagID::no_longer_open:
    return "/* Class Inheritance Change */";
  default:
    return StringRef();
  }
}
}

swift::ide::api::
ModuleDifferDiagsConsumer::ModuleDifferDiagsConsumer(bool DiagnoseModuleDiff,
                                                     llvm::raw_ostream &OS):
    PrintingDiagnosticConsumer(OS), OS(OS),
    DiagnoseModuleDiff(DiagnoseModuleDiff) {
#define DIAG(KIND, ID, Options, Text, Signature)                              \
  auto ID = getCategoryName(LocalDiagID::ID);                                 \
  assert(!ID.empty());                                                        \
  AllDiags[ID] = std::set<std::string>();
#include "swift/AST/DiagnosticsModuleDiffer.def"
}

void swift::ide::api::ModuleDifferDiagsConsumer::handleDiagnostic(
    SourceManager &SM, SourceLoc Loc, DiagnosticKind Kind,
    StringRef FormatString, ArrayRef<DiagnosticArgument> FormatArgs,
    const DiagnosticInfo &Info,
    const SourceLoc bufferIndirectlyCausingDiagnostic) {
  auto Category = getCategoryName((uint32_t)Info.ID);
  if (Category.empty()) {
    PrintingDiagnosticConsumer::handleDiagnostic(
        SM, Loc, Kind, FormatString, FormatArgs, Info,
        bufferIndirectlyCausingDiagnostic);
    return;
  }
  if (!DiagnoseModuleDiff)
    return;
  llvm::SmallString<256> Text;
  {
    llvm::raw_svector_ostream Out(Text);
    DiagnosticEngine::formatDiagnosticText(Out, FormatString, FormatArgs);
  }
  AllDiags[Category].insert(Text.str().str());
}

swift::ide::api::ModuleDifferDiagsConsumer::~ModuleDifferDiagsConsumer() {
  for (auto &Pair: AllDiags) {
    OS << "\n";
    OS << Pair.first << "\n";
    for (auto &Item: Pair.second) {
      OS << Item << "\n";
    }
  }
}