//===--- TemplateName.h - C++ Template Name Representation-------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines the TemplateName interface and subclasses.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/TemplateName.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/PrettyPrinter.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/LangOptions.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
using namespace llvm;

TemplateName::NameKind TemplateName::getKind() const {
  if (Storage.is<TemplateDecl *>())
    return Template;
  if (Storage.is<OverloadedTemplateStorage *>())
    return OverloadedTemplate;
  if (Storage.is<QualifiedTemplateName *>())
    return QualifiedTemplate;
  assert(Storage.is<DependentTemplateName *>() && "There's a case unhandled!");
  return DependentTemplate;
}

TemplateDecl *TemplateName::getAsTemplateDecl() const {
  if (TemplateDecl *Template = Storage.dyn_cast<TemplateDecl *>())
    return Template;

  if (QualifiedTemplateName *QTN = getAsQualifiedTemplateName())
    return QTN->getTemplateDecl();

  return 0;
}

bool TemplateName::isDependent() const {
  if (TemplateDecl *Template = getAsTemplateDecl()) {
    if (isa<TemplateTemplateParmDecl>(Template))
      return true;
    // FIXME: Hack, getDeclContext() can be null if Template is still
    // initializing due to PCH reading, so we check it before using it.
    // Should probably modify TemplateSpecializationType to allow constructing
    // it without the isDependent() checking.
    return Template->getDeclContext() &&
           Template->getDeclContext()->isDependentContext();
  }

  assert(!getAsOverloadedTemplate() &&
         "overloaded templates shouldn't survive to here");

  return true;
}

bool TemplateName::containsUnexpandedParameterPack() const {
  if (TemplateDecl *Template = getAsTemplateDecl()) {
    if (TemplateTemplateParmDecl *TTP 
                                  = dyn_cast<TemplateTemplateParmDecl>(Template))
      return TTP->isParameterPack();

    return false;
  }

  if (DependentTemplateName *DTN = getAsDependentTemplateName())
    return DTN->getQualifier() && 
      DTN->getQualifier()->containsUnexpandedParameterPack();

  return false;
}

void
TemplateName::print(llvm::raw_ostream &OS, const PrintingPolicy &Policy,
                    bool SuppressNNS) const {
  if (TemplateDecl *Template = Storage.dyn_cast<TemplateDecl *>())
    OS << Template;
  else if (QualifiedTemplateName *QTN = getAsQualifiedTemplateName()) {
    if (!SuppressNNS)
      QTN->getQualifier()->print(OS, Policy);
    if (QTN->hasTemplateKeyword())
      OS << "template ";
    OS << QTN->getDecl();
  } else if (DependentTemplateName *DTN = getAsDependentTemplateName()) {
    if (!SuppressNNS && DTN->getQualifier())
      DTN->getQualifier()->print(OS, Policy);
    OS << "template ";
    
    if (DTN->isIdentifier())
      OS << DTN->getIdentifier()->getName();
    else
      OS << "operator " << getOperatorSpelling(DTN->getOperator());
  }
}

const DiagnosticBuilder &clang::operator<<(const DiagnosticBuilder &DB,
                                           TemplateName N) {
  std::string NameStr;
  raw_string_ostream OS(NameStr);
  LangOptions LO;
  LO.CPlusPlus = true;
  LO.Bool = true;
  N.print(OS, PrintingPolicy(LO));
  OS.flush();
  return DB << NameStr;
}

void TemplateName::dump() const {
  LangOptions LO;  // FIXME!
  LO.CPlusPlus = true;
  LO.Bool = true;
  print(llvm::errs(), PrintingPolicy(LO));
}
