/*=========================================================================

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmDependsFortran.h"

#include "cmSystemTools.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmGeneratedFileStream.h"

#include "cmDependsFortranParser.h" /* Interface to parser object.  */

#include <assert.h>
#include <stack>

// TODO: Test compiler for the case of the mod file.  Some always
// use lower case and some always use upper case.  I do not know if any
// use the case from the source code.

//----------------------------------------------------------------------------
// Information about a single source file.
class cmDependsFortranSourceInfo
{
public:
  // The name of the soruce file.
  std::string Source;

  // Set of provided and required modules.
  std::set<cmStdString> Provides;
  std::set<cmStdString> Requires;

  // Set of files included in the translation unit.
  std::set<cmStdString> Includes;
};

//----------------------------------------------------------------------------
// Parser methods not included in generated interface.

// Get the current buffer processed by the lexer.
YY_BUFFER_STATE cmDependsFortranLexer_GetCurrentBuffer(yyscan_t yyscanner);

// The parser entry point.
int cmDependsFortran_yyparse(yyscan_t);

//----------------------------------------------------------------------------
// Define parser object internal structure.
struct cmDependsFortranFile
{
  cmDependsFortranFile(FILE* file, YY_BUFFER_STATE buffer,
                       const std::string& dir):
    File(file), Buffer(buffer), Directory(dir) {}
  FILE* File;
  YY_BUFFER_STATE Buffer;
  std::string Directory;
};

struct cmDependsFortranParser_s
{
  cmDependsFortranParser_s(cmDependsFortran* self,
                           cmDependsFortranSourceInfo& info);
  ~cmDependsFortranParser_s();

  // Pointer back to the main class.
  cmDependsFortran* Self;

  // Lexical scanner instance.
  yyscan_t Scanner;

  // Stack of open files in the translation unit.
  std::stack<cmDependsFortranFile> FileStack;

  // Buffer for string literals.
  std::string TokenString;

  // Flag for whether lexer is reading from inside an interface.
  bool InInterface;

  int OldStartcond;
  bool InPPFalseBranch;
  std::vector<bool> SkipToEnd;
  int StepI;

  // Information about the parsed source.
  cmDependsFortranSourceInfo& Info;
};

//----------------------------------------------------------------------------
class cmDependsFortranInternals
{
public:
  // The set of modules provided by this target.
  std::set<cmStdString> TargetProvides;

  // Map modules required by this target to locations.
  typedef std::map<cmStdString, cmStdString> TargetRequiresMap;
  TargetRequiresMap TargetRequires;

  // Information about each object file.
  typedef std::map<cmStdString, cmDependsFortranSourceInfo> ObjectInfoMap;
  ObjectInfoMap ObjectInfo;

  cmDependsFortranSourceInfo& CreateObjectInfo(const char* obj,
                                               const char* src)
    {
    std::map<cmStdString, cmDependsFortranSourceInfo>::iterator i =
      this->ObjectInfo.find(obj);
    if(i == this->ObjectInfo.end())
      {
      std::map<cmStdString, cmDependsFortranSourceInfo>::value_type
        entry(obj, cmDependsFortranSourceInfo());
      i = this->ObjectInfo.insert(entry).first;
      i->second.Source = src;
      }
    return i->second;
    }
};

//----------------------------------------------------------------------------
cmDependsFortran::cmDependsFortran():
  IncludePath(0), Internal(0)
{
}

//----------------------------------------------------------------------------
cmDependsFortran::cmDependsFortran(std::vector<std::string> const& includes):
  IncludePath(&includes), Internal(new cmDependsFortranInternals)
{
}

//----------------------------------------------------------------------------
cmDependsFortran::~cmDependsFortran()
{
  delete this->Internal;
}

//----------------------------------------------------------------------------
bool cmDependsFortran::WriteDependencies(const char *src, const char *obj,
  std::ostream& makeDepends, std::ostream& internalDepends)
{
  // Make sure this is a scanning instance.
  if(!src || src[0] == '\0')
    {
    cmSystemTools::Error("Cannot scan dependencies without an source file.");
    return false;
    }
  if(!obj || obj[0] == '\0')
    {
    cmSystemTools::Error("Cannot scan dependencies without an object file.");
    return false;
    }
  if(!this->IncludePath)
    {
    cmSystemTools::Error("Cannot scan dependencies without an include path.");
    return false;
    }

  // Get the information object for this source.
  cmDependsFortranSourceInfo& info =
    this->Internal->CreateObjectInfo(obj, src);

  // Create the parser object.
  cmDependsFortranParser parser(this, info);

  // Push on the starting file.
  cmDependsFortranParser_FilePush(&parser, src);

  // Parse the translation unit.
  if(cmDependsFortran_yyparse(parser.Scanner) != 0)
    {
    // Failed to parse the file.  Report failure to write dependencies.
    return false;
    }

  return true;
}

//----------------------------------------------------------------------------
bool cmDependsFortran::Finalize(std::ostream& makeDepends,
                                std::ostream& internalDepends)
{
  // Prepare the module search process.
  this->LocateModules();

  // Actually write dependencies to the streams.
  typedef cmDependsFortranInternals::ObjectInfoMap ObjectInfoMap;
  ObjectInfoMap const& objInfo = this->Internal->ObjectInfo;
  for(ObjectInfoMap::const_iterator i = objInfo.begin();
      i != objInfo.end(); ++i)
    {
    if(!this->WriteDependenciesReal(i->first.c_str(), i->second,
                                    makeDepends, internalDepends))
      {
      return false;
      }
    }

  // Store the list of modules provided by this target.
  std::string fiName = this->TargetDirectory;
  fiName += "/fortran.internal";
  cmGeneratedFileStream fiStream(fiName.c_str());
  fiStream << "# The fortran modules provided by this target.\n";
  fiStream << "provides\n";
  std::set<cmStdString> const& provides = this->Internal->TargetProvides;
  for(std::set<cmStdString>::const_iterator i = provides.begin();
      i != provides.end(); ++i)
    {
    fiStream << " " << *i << "\n";
    }

  // Create a script to clean the modules.
  if(!provides.empty())
    {
    std::string fcName = this->TargetDirectory;
    fcName += "/cmake_clean_Fortran.cmake";
    cmGeneratedFileStream fcStream(fcName.c_str());
    fcStream << "# Remove fortran modules provided by this target.\n";
    fcStream << "FILE(REMOVE\n";
    for(std::set<cmStdString>::const_iterator i = provides.begin();
        i != provides.end(); ++i)
      {
      std::string mod_upper = cmSystemTools::UpperCase(*i);
      std::string mod_lower = *i;
      fcStream << " \"" << mod_lower << ".mod\""
               << " \"" << mod_lower << ".mod.stamp\""
               << " \"" << mod_upper << ".mod\""
               << " \"" << mod_upper << ".mod.stamp\"\n";
      }
    fcStream << "  )\n";
    }
  return true;
}

//----------------------------------------------------------------------------
void cmDependsFortran::LocateModules()
{
  // Collect the set of modules provided and required by all sources.
  typedef cmDependsFortranInternals::ObjectInfoMap ObjectInfoMap;
  ObjectInfoMap const& objInfo = this->Internal->ObjectInfo;
  for(ObjectInfoMap::const_iterator infoI = objInfo.begin();
      infoI != objInfo.end(); ++infoI)
    {
    cmDependsFortranSourceInfo const& info = infoI->second;
    for(std::set<cmStdString>::const_iterator i = info.Provides.begin();
        i != info.Provides.end(); ++i)
      {
      // Include this module in the set provided by this target.
      this->Internal->TargetProvides.insert(*i);
      }

    for(std::set<cmStdString>::const_iterator i = info.Requires.begin();
        i != info.Requires.end(); ++i)
      {
      // Include this module in the set required by this target.
      this->Internal->TargetRequires[*i] = "";
      }
    }

  // Short-circuit for simple targets.
  if(this->Internal->TargetRequires.empty())
    {
    return;
    }

  // Match modules provided by this target to those it requires.
  this->MatchLocalModules();

  // Load information about other targets.
  cmMakefile* mf = this->LocalGenerator->GetMakefile();
  std::vector<std::string> infoFiles;
  if(const char* infoFilesValue =
     mf->GetDefinition("CMAKE_TARGET_LINKED_INFO_FILES"))
    {
    cmSystemTools::ExpandListArgument(infoFilesValue, infoFiles);
    }
  for(std::vector<std::string>::const_iterator i = infoFiles.begin();
      i != infoFiles.end(); ++i)
    {
    std::string targetDir = cmSystemTools::GetFilenamePath(*i);
    std::string fname = targetDir + "/fortran.internal";
    std::ifstream fin(fname.c_str());
    if(fin)
      {
      std::string moduleDir =
        cmSystemTools::GetFilenamePath(
          cmSystemTools::GetFilenamePath(targetDir));
      this->MatchRemoteModules(fin, moduleDir.c_str());
      }
    }
}

//----------------------------------------------------------------------------
void cmDependsFortran::MatchLocalModules()
{
  const char* moduleDir =
    this->LocalGenerator->GetMakefile()->GetCurrentOutputDirectory();
  std::set<cmStdString> const& provides = this->Internal->TargetProvides;
  for(std::set<cmStdString>::const_iterator i = provides.begin();
      i != provides.end(); ++i)
    {
    this->ConsiderModule(i->c_str(), moduleDir);
    }
}

//----------------------------------------------------------------------------
void cmDependsFortran::MatchRemoteModules(std::istream& fin,
                                          const char* moduleDir)
{
  std::string line;
  bool doing_provides;
  while(cmSystemTools::GetLineFromStream(fin, line))
    {
    // Ignore comments and empty lines.
    if(line.empty() || line[0] == '#' || line[0] == '\r')
      {
      continue;
      }

    if(line[0] == ' ')
      {
      if(doing_provides)
        {
        this->ConsiderModule(line.c_str()+1, moduleDir);
        }
      }
    else if(line == "provides")
      {
      doing_provides = true;
      }
    else
      {
      doing_provides = false;
      }
    }
}

//----------------------------------------------------------------------------
void cmDependsFortran::ConsiderModule(const char* name,
                                      const char* moduleDir)
{
  // Locate each required module.
  typedef cmDependsFortranInternals::TargetRequiresMap TargetRequiresMap;
  TargetRequiresMap::iterator required =
    this->Internal->TargetRequires.find(name);
  if(required != this->Internal->TargetRequires.end() &&
     required->second.empty())
    {
    // The module is provided by a CMake target.  It will have a stamp file.
    std::string stampFile = moduleDir;
    stampFile += "/";
    stampFile += name;
    stampFile += ".mod.stamp";
    required->second = stampFile;
    }
}

//----------------------------------------------------------------------------
bool
cmDependsFortran
::WriteDependenciesReal(const char *obj,
                        cmDependsFortranSourceInfo const& info,
                        std::ostream& makeDepends,
                        std::ostream& internalDepends)
{
  typedef cmDependsFortranInternals::TargetRequiresMap TargetRequiresMap;

  // Get the source file for this object.
  const char* src = info.Source.c_str();

  // Get the directory in which stamp files will be stored.
  std::string mod_dir =
    this->LocalGenerator->GetMakefile()->GetCurrentOutputDirectory();

  // Write the include dependencies to the output stream.
  internalDepends << obj << std::endl;
  internalDepends << " " << src << std::endl;
  for(std::set<cmStdString>::const_iterator i = info.Includes.begin();
      i != info.Includes.end(); ++i)
    {
    makeDepends << obj << ": "
       << cmSystemTools::ConvertToOutputPath(i->c_str()).c_str()
       << std::endl;
    internalDepends << " " << i->c_str() << std::endl;
    }
  makeDepends << std::endl;

  // Write module requirements to the output stream.
  for(std::set<cmStdString>::const_iterator i = info.Requires.begin();
      i != info.Requires.end(); ++i)
    {
    // Require only modules not provided in the same source.
    if(info.Provides.find(*i) != info.Provides.end())
      {
      continue;
      }

    // If the module is provided in this target special handling is
    // needed.
    if(this->Internal->TargetProvides.find(*i) !=
       this->Internal->TargetProvides.end())
      {
      // The module is provided by a different source in the same
      // target.  Add the proxy dependency to make sure the other
      // source builds first.
      std::string proxy = mod_dir;
      proxy += "/";
      proxy += *i;
      proxy += ".mod.proxy";
      proxy = this->LocalGenerator->Convert(proxy.c_str(),
                                            cmLocalGenerator::HOME_OUTPUT,
                                            cmLocalGenerator::MAKEFILE);

      // since we require some things add them to our list of requirements
      makeDepends << obj << ".requires: " << proxy << std::endl;

      // create an empty proxy in case no other source provides it
      makeDepends << proxy << ":" << std::endl;
      }

    // The object file should depend on timestamped files for the
    // modules it uses.
    TargetRequiresMap::const_iterator required =
      this->Internal->TargetRequires.find(*i);
    if(required == this->Internal->TargetRequires.end()) { abort(); }
    if(!required->second.empty())
      {
      // This module is known.  Depend on its timestamp file.
      std::string stampFile =
        this->LocalGenerator->Convert(required->second.c_str(),
                                      cmLocalGenerator::HOME_OUTPUT,
                                      cmLocalGenerator::SHELL);
      makeDepends << obj << ": " << stampFile << "\n";
      }
    else
      {
      // This module is not known to CMake.  Try to locate it where
      // the compiler will and depend on that.
      std::string module;
      if(this->FindModule(*i, module))
        {
        module =
          this->LocalGenerator->Convert(module.c_str(),
                                        cmLocalGenerator::HOME_OUTPUT,
                                        cmLocalGenerator::SHELL);
        makeDepends << obj << ": " << module << "\n";
        }
      }
    }

  // Write provided modules to the output stream.
  for(std::set<cmStdString>::const_iterator i = info.Provides.begin();
      i != info.Provides.end(); ++i)
    {
    std::string proxy = mod_dir;
    proxy += "/";
    proxy += *i;
    proxy += ".mod.proxy";
    proxy = this->LocalGenerator->Convert(proxy.c_str(),
                                          cmLocalGenerator::HOME_OUTPUT,
                                          cmLocalGenerator::MAKEFILE);
    makeDepends << proxy << ": " << obj << ".provides" << std::endl;
    }

  // If any modules are provided then they must be converted to stamp files.
  if(!info.Provides.empty())
    {
    // Create a target to copy the module after the object file
    // changes.
    makeDepends << obj << ".provides.build:\n";
    for(std::set<cmStdString>::const_iterator i = info.Provides.begin();
        i != info.Provides.end(); ++i)
      {
      // Include this module in the set provided by this target.
      this->Internal->TargetProvides.insert(*i);

      // Always use lower case for the mod stamp file name.  The
      // cmake_copy_f90_mod will call back to this class, which will
      // try various cases for the real mod file name.
      std::string m = cmSystemTools::LowerCase(*i);
      std::string modFile = mod_dir;
      modFile += "/";
      modFile += *i;
      modFile =
        this->LocalGenerator->Convert(modFile.c_str(),
                                      cmLocalGenerator::HOME_OUTPUT,
                                      cmLocalGenerator::SHELL);
      std::string stampFile = mod_dir;
      stampFile += "/";
      stampFile += m;
      stampFile += ".mod.stamp";
      stampFile =
        this->LocalGenerator->Convert(stampFile.c_str(),
                                      cmLocalGenerator::HOME_OUTPUT,
                                      cmLocalGenerator::SHELL);
      makeDepends << "\t$(CMAKE_COMMAND) -E cmake_copy_f90_mod "
                  << modFile << " " << stampFile << "\n";
      }
    // After copying the modules update the timestamp file so that
    // copying will not be done again until the source rebuilds.
    makeDepends << "\t$(CMAKE_COMMAND) -E touch " << obj
                << ".provides.build\n";

    // Make sure the module timestamp rule is evaluated by the time
    // the target finishes building.
    std::string driver = this->TargetDirectory;
    driver += "/build";
    driver = this->LocalGenerator->Convert(driver.c_str(),
                                           cmLocalGenerator::HOME_OUTPUT,
                                           cmLocalGenerator::MAKEFILE);
    makeDepends << driver << ": " << obj << ".provides.build\n";
    }

  return true;
}

//----------------------------------------------------------------------------
bool cmDependsFortran::FindModule(std::string const& name,
                                  std::string& module)
{
  // Construct possible names for the module file.
  std::string mod_upper = cmSystemTools::UpperCase(name);
  std::string mod_lower = name;
  mod_upper += ".mod";
  mod_lower += ".mod";

  // Search the include path for the module.
  std::string fullName;
  for(std::vector<std::string>::const_iterator i =
        this->IncludePath->begin(); i != this->IncludePath->end(); ++i)
    {
    // Try the lower-case name.
    fullName = *i;
    fullName += "/";
    fullName += mod_lower;
    if(cmSystemTools::FileExists(fullName.c_str(), true))
      {
      module = fullName;
      return true;
      }

    // Try the upper-case name.
    fullName = *i;
    fullName += "/";
    fullName += mod_upper;
    if(cmSystemTools::FileExists(fullName.c_str(), true))
      {
      module = fullName;
      return true;
      }
    }
  return false;
}

//----------------------------------------------------------------------------
bool cmDependsFortran::CopyModule(const std::vector<std::string>& args)
{
  // Implements
  //
  //   $(CMAKE_COMMAND) -E cmake_copy_f90_mod input.mod output.mod.stamp
  //
  // Note that the case of the .mod file depends on the compiler.  In
  // the future this copy could also account for the fact that some
  // compilers include a timestamp in the .mod file so it changes even
  // when the interface described in the module does not.

  std::string mod = args[2];
  std::string stamp = args[3];
  std::string mod_dir = cmSystemTools::GetFilenamePath(mod);
  if(!mod_dir.empty()) { mod_dir += "/"; }
  std::string mod_upper = mod_dir;
  mod_upper += cmSystemTools::UpperCase(cmSystemTools::GetFilenameName(mod));
  std::string mod_lower = mod_dir;
  mod_lower += cmSystemTools::LowerCase(cmSystemTools::GetFilenameName(mod));
  mod += ".mod";
  mod_upper += ".mod";
  mod_lower += ".mod";
  if(cmSystemTools::FileExists(mod_upper.c_str(), true))
    {
    if(!cmSystemTools::CopyFileIfDifferent(mod_upper.c_str(), stamp.c_str()))
      {
      std::cerr << "Error copying Fortran module from \""
                << mod_upper.c_str() << "\" to \"" << stamp.c_str()
                << "\".\n";
      return false;
      }
    return true;
    }
  else if(cmSystemTools::FileExists(mod_lower.c_str(), true))
    {
    if(!cmSystemTools::CopyFileIfDifferent(mod_lower.c_str(), stamp.c_str()))
      {
      std::cerr << "Error copying Fortran module from \""
                << mod_lower.c_str() << "\" to \"" << stamp.c_str()
                << "\".\n";
      return false;
      }
    return true;
    }

  std::cerr << "Error copying Fortran module \"" << args[2].c_str()
            << "\".  Tried \"" << mod_upper.c_str()
            << "\" and \"" << mod_lower.c_str() << "\".\n";
  return false;
}

//----------------------------------------------------------------------------
bool cmDependsFortran::FindIncludeFile(const char* dir,
                                       const char* includeName,
                                       std::string& fileName)
{
  // If the file is a full path, include it directly.
  if(cmSystemTools::FileIsFullPath(includeName))
    {
    fileName = includeName;
    return cmSystemTools::FileExists(fileName.c_str(), true);
    }
  else
    {
    // Check for the file in the directory containing the including
    // file.
    std::string fullName = dir;
    fullName += "/";
    fullName += includeName;
    if(cmSystemTools::FileExists(fullName.c_str(), true))
      {
      fileName = fullName;
      return true;
      }

    // Search the include path for the file.
    for(std::vector<std::string>::const_iterator i = 
          this->IncludePath->begin(); i != this->IncludePath->end(); ++i)
      {
      fullName = *i;
      fullName += "/";
      fullName += includeName;
      if(cmSystemTools::FileExists(fullName.c_str(), true))
        {
        fileName = fullName;
        return true;
        }
      }
    }
  return false;
}

//----------------------------------------------------------------------------
cmDependsFortranParser_s
::cmDependsFortranParser_s(cmDependsFortran* self,
                           cmDependsFortranSourceInfo& info):
  Self(self), Info(info)
{
  this->InInterface = 0;

  // Initialize the lexical scanner.
  cmDependsFortran_yylex_init(&this->Scanner);
  cmDependsFortran_yyset_extra(this, this->Scanner);

  // Create a dummy buffer that is never read but is the fallback
  // buffer when the last file is popped off the stack.
  YY_BUFFER_STATE buffer =
    cmDependsFortran_yy_create_buffer(0, 4, this->Scanner);
  cmDependsFortran_yy_switch_to_buffer(buffer, this->Scanner);
}

//----------------------------------------------------------------------------
cmDependsFortranParser_s::~cmDependsFortranParser_s()
{
  cmDependsFortran_yylex_destroy(this->Scanner);
}

//----------------------------------------------------------------------------
bool cmDependsFortranParser_FilePush(cmDependsFortranParser* parser,
                                    const char* fname)
{
  // Open the new file and push it onto the stack.  Save the old
  // buffer with it on the stack.
  if(FILE* file = fopen(fname, "rb"))
    {
    YY_BUFFER_STATE current =
      cmDependsFortranLexer_GetCurrentBuffer(parser->Scanner);
    std::string dir = cmSystemTools::GetParentDirectory(fname);
    cmDependsFortranFile f(file, current, dir);
    YY_BUFFER_STATE buffer =
      cmDependsFortran_yy_create_buffer(0, 16384, parser->Scanner);
    cmDependsFortran_yy_switch_to_buffer(buffer, parser->Scanner);
    parser->FileStack.push(f);
    return 1;
    }
  else
    {
    return 0;
    }
}

//----------------------------------------------------------------------------
bool cmDependsFortranParser_FilePop(cmDependsFortranParser* parser)
{
  // Pop one file off the stack and close it.  Switch the lexer back
  // to the next one on the stack.
  if(parser->FileStack.empty())
    {
    return 0;
    }
  else
    {
    cmDependsFortranFile f = parser->FileStack.top(); parser->FileStack.pop();
    fclose(f.File);
    YY_BUFFER_STATE current =
      cmDependsFortranLexer_GetCurrentBuffer(parser->Scanner);
    cmDependsFortran_yy_delete_buffer(current, parser->Scanner);
    cmDependsFortran_yy_switch_to_buffer(f.Buffer, parser->Scanner);
    return 1;
    }
}

//----------------------------------------------------------------------------
int cmDependsFortranParser_Input(cmDependsFortranParser* parser,
                                 char* buffer, size_t bufferSize)
{
  // Read from the file on top of the stack.  If the stack is empty,
  // the end of the translation unit has been reached.
  if(!parser->FileStack.empty())
    {
    FILE* file = parser->FileStack.top().File;
    return (int)fread(buffer, 1, bufferSize, file);
    }
  return 0;
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_StringStart(cmDependsFortranParser* parser)
{
  parser->TokenString = "";
}

//----------------------------------------------------------------------------
const char* cmDependsFortranParser_StringEnd(cmDependsFortranParser* parser)
{
  return parser->TokenString.c_str();
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_StringAppend(cmDependsFortranParser* parser,
                                         char c)
{
  parser->TokenString += c;
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_SetInInterface(cmDependsFortranParser* parser,
                                           bool in)
{
  parser->InInterface = in;
}

//----------------------------------------------------------------------------
bool cmDependsFortranParser_GetInInterface(cmDependsFortranParser* parser)
{
  return parser->InInterface;
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_SetOldStartcond(cmDependsFortranParser* parser,
                                            int arg)
{
  parser->OldStartcond = arg;
}

//----------------------------------------------------------------------------
int cmDependsFortranParser_GetOldStartcond(cmDependsFortranParser* parser)
{
  return parser->OldStartcond;
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_Error(cmDependsFortranParser*, const char*)
{
  // If there is a parser error just ignore it.  The source will not
  // compile and the user will edit it.  Then dependencies will have
  // to be regenerated anyway.
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleUse(cmDependsFortranParser* parser,
                                    const char* name)
{
  parser->Info.Requires.insert(cmSystemTools::LowerCase(name) );
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleInclude(cmDependsFortranParser* parser,
                                        const char* name)
{
  // If processing an include statement there must be an open file.
  assert(!parser->FileStack.empty());

  // Get the directory containing the source in which the include
  // statement appears.  This is always the first search location for
  // Fortran include files.
  std::string dir = parser->FileStack.top().Directory;

  // Find the included file.  If it cannot be found just ignore the
  // problem because either the source will not compile or the user
  // does not care about depending on this included source.
  std::string fullName;
  if(parser->Self->FindIncludeFile(dir.c_str(), name, fullName))
    {
    // Found the included file.  Save it in the set of included files.
    parser->Info.Includes.insert(fullName);

    // Parse it immediately to translate the source inline.
    cmDependsFortranParser_FilePush(parser, fullName.c_str());
    }
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleModule(cmDependsFortranParser* parser,
                                       const char* name)
{
  if(!parser->InInterface )
    {
    parser->Info.Provides.insert(cmSystemTools::LowerCase(name));
    }
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleDefine(cmDependsFortranParser*, const char*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleUndef(cmDependsFortranParser*, const char*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleIfdef(cmDependsFortranParser*, const char*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleIfndef(cmDependsFortranParser*, const char*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleIf(cmDependsFortranParser*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleElif(cmDependsFortranParser*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleElse(cmDependsFortranParser*)
{
}

//----------------------------------------------------------------------------
void cmDependsFortranParser_RuleEndif(cmDependsFortranParser*)
{
}