//===-- Twine.cpp - Fast Temporary String Concatenation -------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#include "llvm/ADT/Twine.h"

#include "llvm/ADT/SmallString.h"

#include "llvm/Config/llvm-config.h"

#include "llvm/Support/Debug.h"

#include "llvm/Support/FormatVariadic.h"

#include "llvm/Support/raw_ostream.h"

using namespace llvm;

std::string Twine::str() const {

  // If we're storing only a std::string, just return it.

  if (LHSKind == StdStringKind && RHSKind == EmptyKind)

    return *LHS.stdString;

  // If we're storing a formatv_object, we can avoid an extra copy by formatting

  // it immediately and returning the result.

  if (LHSKind == FormatvObjectKind && RHSKind == EmptyKind)

    return LHS.formatvObject->str();

  // Otherwise, flatten and copy the contents first.

  SmallString<256> Vec;

  return toStringRef(Vec).str();

}

void Twine::toVector(SmallVectorImpl<char> &Out) const {

  raw_svector_ostream OS(Out);

  print(OS);

}

StringRef Twine::toNullTerminatedStringRef(SmallVectorImpl<char> &Out) const {

  if (isUnary()) {

    switch (getLHSKind()) {

    case CStringKind:

      // Already null terminated, yay!

      return StringRef(LHS.cString);

    case StdStringKind: {

      const std::string *str = LHS.stdString;

      return StringRef(str->c_str(), str->size());

    }

    default:

      break;

    }

  }

  toVector(Out);

  Out.push_back(0);

  Out.pop_back();

  return StringRef(Out.data(), Out.size());

}

void Twine::printOneChild(raw_ostream &OS, Child Ptr,

                          NodeKind Kind) const {

  switch (Kind) {

  case Twine::NullKind: break;

  case Twine::EmptyKind: break;

  case Twine::TwineKind:

    Ptr.twine->print(OS);

    break;

  case Twine::CStringKind:

    OS << Ptr.cString;

    break;

  case Twine::StdStringKind:

    OS << *Ptr.stdString;

    break;

  case Twine::StringRefKind:

    OS << *Ptr.stringRef;

    break;

  case Twine::SmallStringKind:

    OS << *Ptr.smallString;

    break;

  case Twine::FormatvObjectKind:

    OS << *Ptr.formatvObject;

    break;

  case Twine::CharKind:

    OS << Ptr.character;

    break;

  case Twine::DecUIKind:

    OS << Ptr.decUI;

    break;

  case Twine::DecIKind:

    OS << Ptr.decI;

    break;

  case Twine::DecULKind:

    OS << *Ptr.decUL;

    break;

  case Twine::DecLKind:

    OS << *Ptr.decL;

    break;

  case Twine::DecULLKind:

    OS << *Ptr.decULL;

    break;

  case Twine::DecLLKind:

    OS << *Ptr.decLL;

    break;

  case Twine::UHexKind:

    OS.write_hex(*Ptr.uHex);

    break;

  }

}

void Twine::printOneChildRepr(raw_ostream &OS, Child Ptr,

                              NodeKind Kind) const {

  switch (Kind) {

  case Twine::NullKind:

    OS << "null"; break;

  case Twine::EmptyKind:

    OS << "empty"; break;

  case Twine::TwineKind:

    OS << "rope:";

    Ptr.twine->printRepr(OS);

    break;

  case Twine::CStringKind:

    OS << "cstring:\""

       << Ptr.cString << "\"";

    break;

  case Twine::StdStringKind:

    OS << "std::string:\""

       << Ptr.stdString << "\"";

    break;

  case Twine::StringRefKind:

    OS << "stringref:\""

       << Ptr.stringRef << "\"";

    break;

  case Twine::SmallStringKind:

    OS << "smallstring:\"" << *Ptr.smallString << "\"";

    break;

  case Twine::FormatvObjectKind:

    OS << "formatv:\"" << *Ptr.formatvObject << "\"";

    break;

  case Twine::CharKind:

    OS << "char:\"" << Ptr.character << "\"";

    break;

  case Twine::DecUIKind:

    OS << "decUI:\"" << Ptr.decUI << "\"";

    break;

  case Twine::DecIKind:

    OS << "decI:\"" << Ptr.decI << "\"";

    break;

  case Twine::DecULKind:

    OS << "decUL:\"" << *Ptr.decUL << "\"";

    break;

  case Twine::DecLKind:

    OS << "decL:\"" << *Ptr.decL << "\"";

    break;

  case Twine::DecULLKind:

    OS << "decULL:\"" << *Ptr.decULL << "\"";

    break;

  case Twine::DecLLKind:

    OS << "decLL:\"" << *Ptr.decLL << "\"";

    break;

  case Twine::UHexKind:

    OS << "uhex:\"" << Ptr.uHex << "\"";

    break;

  }

}

void Twine::print(raw_ostream &OS) const {

  printOneChild(OS, LHS, getLHSKind());

  printOneChild(OS, RHS, getRHSKind());

}

void Twine::printRepr(raw_ostream &OS) const {

  OS << "(Twine ";

  printOneChildRepr(OS, LHS, getLHSKind());

  OS << " ";

  printOneChildRepr(OS, RHS, getRHSKind());

  OS << ")";

}

#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

LLVM_DUMP_METHOD void Twine::dump() const {

  print(dbgs());

}

LLVM_DUMP_METHOD void Twine::dumpRepr() const {

  printRepr(dbgs());

}

#endif