/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#include "cmListFileCache.h"

#include "cmListFileLexer.h"
#include "cmMakefile.h"
#include "cmOutputConverter.h"
#include "cmSystemTools.h"
#include "cmVersion.h"

#include <cmsys/RegularExpression.hxx>

struct cmListFileParser
{
  cmListFileParser(cmListFile* lf, cmMakefile* mf, const char* filename);
  ~cmListFileParser();
  bool ParseFile();
  bool ParseFunction(const char* name, long line);
  bool AddArgument(cmListFileLexer_Token* token,
                   cmListFileArgument::Delimiter delim);
  cmListFile* ListFile;
  cmMakefile* Makefile;
  const char* FileName;
  cmListFileLexer* Lexer;
  cmListFileFunction Function;
  enum
  {
    SeparationOkay,
    SeparationWarning,
    SeparationError
  } Separation;
};

cmListFileParser::cmListFileParser(cmListFile* lf, cmMakefile* mf,
                                   const char* filename)
  : ListFile(lf)
  , Makefile(mf)
  , FileName(filename)
  , Lexer(cmListFileLexer_New())
{
}

cmListFileParser::~cmListFileParser()
{
  cmListFileLexer_Delete(this->Lexer);
}

bool cmListFileParser::ParseFile()
{
  // Open the file.
  cmListFileLexer_BOM bom;
  if (!cmListFileLexer_SetFileName(this->Lexer, this->FileName, &bom)) {
    cmSystemTools::Error("cmListFileCache: error can not open file ",
                         this->FileName);
    return false;
  }

  // Verify the Byte-Order-Mark, if any.
  if (bom != cmListFileLexer_BOM_None && bom != cmListFileLexer_BOM_UTF8) {
    cmListFileLexer_SetFileName(this->Lexer, 0, 0);
    std::ostringstream m;
    m << "File\n  " << this->FileName << "\n"
      << "starts with a Byte-Order-Mark that is not UTF-8.";
    this->Makefile->IssueMessage(cmake::FATAL_ERROR, m.str());
    return false;
  }

  // Use a simple recursive-descent parser to process the token
  // stream.
  bool haveNewline = true;
  while (cmListFileLexer_Token* token = cmListFileLexer_Scan(this->Lexer)) {
    if (token->type == cmListFileLexer_Token_Space) {
    } else if (token->type == cmListFileLexer_Token_Newline) {
      haveNewline = true;
    } else if (token->type == cmListFileLexer_Token_CommentBracket) {
      haveNewline = false;
    } else if (token->type == cmListFileLexer_Token_Identifier) {
      if (haveNewline) {
        haveNewline = false;
        if (this->ParseFunction(token->text, token->line)) {
          this->ListFile->Functions.push_back(this->Function);
        } else {
          return false;
        }
      } else {
        std::ostringstream error;
        error << "Error in cmake code at\n"
              << this->FileName << ":" << token->line << ":\n"
              << "Parse error.  Expected a newline, got "
              << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
              << " with text \"" << token->text << "\".";
        cmSystemTools::Error(error.str().c_str());
        return false;
      }
    } else {
      std::ostringstream error;
      error << "Error in cmake code at\n"
            << this->FileName << ":" << token->line << ":\n"
            << "Parse error.  Expected a command name, got "
            << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
            << " with text \"" << token->text << "\".";
      cmSystemTools::Error(error.str().c_str());
      return false;
    }
  }
  return true;
}

bool cmListFile::ParseFile(const char* filename, bool topLevel, cmMakefile* mf)
{
  if (!cmSystemTools::FileExists(filename) ||
      cmSystemTools::FileIsDirectory(filename)) {
    return false;
  }

  bool parseError = false;

  {
    cmListFileParser parser(this, mf, filename);
    parseError = !parser.ParseFile();
  }

  // do we need a cmake_policy(VERSION call?
  if (topLevel) {
    bool hasVersion = false;
    // search for the right policy command
    for (std::vector<cmListFileFunction>::iterator i = this->Functions.begin();
         i != this->Functions.end(); ++i) {
      if (cmSystemTools::LowerCase(i->Name) == "cmake_minimum_required") {
        hasVersion = true;
        break;
      }
    }
    // if no policy command is found this is an error if they use any
    // non advanced functions or a lot of functions
    if (!hasVersion) {
      bool isProblem = true;
      if (this->Functions.size() < 30) {
        // the list of simple commands DO NOT ADD TO THIS LIST!!!!!
        // these commands must have backwards compatibility forever and
        // and that is a lot longer than your tiny mind can comprehend mortal
        std::set<std::string> allowedCommands;
        allowedCommands.insert("project");
        allowedCommands.insert("set");
        allowedCommands.insert("if");
        allowedCommands.insert("endif");
        allowedCommands.insert("else");
        allowedCommands.insert("elseif");
        allowedCommands.insert("add_executable");
        allowedCommands.insert("add_library");
        allowedCommands.insert("target_link_libraries");
        allowedCommands.insert("option");
        allowedCommands.insert("message");
        isProblem = false;
        for (std::vector<cmListFileFunction>::iterator i =
               this->Functions.begin();
             i != this->Functions.end(); ++i) {
          std::string name = cmSystemTools::LowerCase(i->Name);
          if (allowedCommands.find(name) == allowedCommands.end()) {
            isProblem = true;
            break;
          }
        }
      }

      if (isProblem) {
        // Tell the top level cmMakefile to diagnose
        // this violation of CMP0000.
        mf->SetCheckCMP0000(true);

        // Implicitly set the version for the user.
        mf->SetPolicyVersion("2.4");
      }
    }
    bool hasProject = false;
    // search for a project command
    for (std::vector<cmListFileFunction>::iterator i = this->Functions.begin();
         i != this->Functions.end(); ++i) {
      if (cmSystemTools::LowerCase(i->Name) == "project") {
        hasProject = true;
        break;
      }
    }
    // if no project command is found, add one
    if (!hasProject) {
      cmListFileFunction project;
      project.Name = "PROJECT";
      cmListFileArgument prj("Project", cmListFileArgument::Unquoted, 0);
      project.Arguments.push_back(prj);
      this->Functions.insert(this->Functions.begin(), project);
    }
  }
  return !parseError;
}

bool cmListFileParser::ParseFunction(const char* name, long line)
{
  // Ininitialize a new function call.
  this->Function = cmListFileFunction();
  this->Function.Name = name;
  this->Function.Line = line;

  // Command name has already been parsed.  Read the left paren.
  cmListFileLexer_Token* token;
  while ((token = cmListFileLexer_Scan(this->Lexer)) &&
         token->type == cmListFileLexer_Token_Space) {
  }
  if (!token) {
    std::ostringstream error;
    /* clang-format off */
    error << "Error in cmake code at\n" << this->FileName << ":"
          << cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
          << "Parse error.  Function missing opening \"(\".";
    /* clang-format on */
    cmSystemTools::Error(error.str().c_str());
    return false;
  }
  if (token->type != cmListFileLexer_Token_ParenLeft) {
    std::ostringstream error;
    error << "Error in cmake code at\n"
          << this->FileName << ":"
          << cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
          << "Parse error.  Expected \"(\", got "
          << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
          << " with text \"" << token->text << "\".";
    cmSystemTools::Error(error.str().c_str());
    return false;
  }

  // Arguments.
  unsigned long lastLine;
  unsigned long parenDepth = 0;
  this->Separation = SeparationOkay;
  while ((lastLine = cmListFileLexer_GetCurrentLine(this->Lexer),
          token = cmListFileLexer_Scan(this->Lexer))) {
    if (token->type == cmListFileLexer_Token_Space ||
        token->type == cmListFileLexer_Token_Newline) {
      this->Separation = SeparationOkay;
      continue;
    }
    if (token->type == cmListFileLexer_Token_ParenLeft) {
      parenDepth++;
      this->Separation = SeparationOkay;
      if (!this->AddArgument(token, cmListFileArgument::Unquoted)) {
        return false;
      }
    } else if (token->type == cmListFileLexer_Token_ParenRight) {
      if (parenDepth == 0) {
        return true;
      }
      parenDepth--;
      this->Separation = SeparationOkay;
      if (!this->AddArgument(token, cmListFileArgument::Unquoted)) {
        return false;
      }
      this->Separation = SeparationWarning;
    } else if (token->type == cmListFileLexer_Token_Identifier ||
               token->type == cmListFileLexer_Token_ArgumentUnquoted) {
      if (!this->AddArgument(token, cmListFileArgument::Unquoted)) {
        return false;
      }
      this->Separation = SeparationWarning;
    } else if (token->type == cmListFileLexer_Token_ArgumentQuoted) {
      if (!this->AddArgument(token, cmListFileArgument::Quoted)) {
        return false;
      }
      this->Separation = SeparationWarning;
    } else if (token->type == cmListFileLexer_Token_ArgumentBracket) {
      if (!this->AddArgument(token, cmListFileArgument::Bracket)) {
        return false;
      }
      this->Separation = SeparationError;
    } else if (token->type == cmListFileLexer_Token_CommentBracket) {
      this->Separation = SeparationError;
    } else {
      // Error.
      std::ostringstream error;
      error << "Error in cmake code at\n"
            << this->FileName << ":"
            << cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
            << "Parse error.  Function missing ending \")\".  "
            << "Instead found "
            << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
            << " with text \"" << token->text << "\".";
      cmSystemTools::Error(error.str().c_str());
      return false;
    }
  }

  std::ostringstream error;
  error << "Error in cmake code at\n"
        << this->FileName << ":" << lastLine << ":\n"
        << "Parse error.  Function missing ending \")\".  "
        << "End of file reached.";
  cmSystemTools::Error(error.str().c_str());

  return false;
}

bool cmListFileParser::AddArgument(cmListFileLexer_Token* token,
                                   cmListFileArgument::Delimiter delim)
{
  cmListFileArgument a(token->text, delim, token->line);
  this->Function.Arguments.push_back(a);
  if (this->Separation == SeparationOkay) {
    return true;
  }
  bool isError = (this->Separation == SeparationError ||
                  delim == cmListFileArgument::Bracket);
  std::ostringstream m;
  /* clang-format off */
  m << "Syntax " << (isError? "Error":"Warning") << " in cmake code at\n"
    << "  " << this->FileName << ":" << token->line << ":"
    << token->column << "\n"
    << "Argument not separated from preceding token by whitespace.";
  /* clang-format on */
  if (isError) {
    this->Makefile->IssueMessage(cmake::FATAL_ERROR, m.str());
    return false;
  } else {
    this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, m.str());
    return true;
  }
}

struct cmListFileBacktrace::Entry : public cmListFileContext
{
  Entry(cmListFileContext const& lfc, Entry* up)
    : cmListFileContext(lfc)
    , Up(up)
    , RefCount(0)
  {
    if (this->Up) {
      this->Up->Ref();
    }
  }
  ~Entry()
  {
    if (this->Up) {
      this->Up->Unref();
    }
  }
  void Ref() { ++this->RefCount; }
  void Unref()
  {
    if (--this->RefCount == 0) {
      delete this;
    }
  }
  Entry* Up;
  unsigned int RefCount;
};

cmListFileBacktrace::cmListFileBacktrace(cmState::Snapshot bottom, Entry* up,
                                         cmListFileContext const& lfc)
  : Bottom(bottom)
  , Cur(new Entry(lfc, up))
{
  assert(this->Bottom.IsValid());
  this->Cur->Ref();
}

cmListFileBacktrace::cmListFileBacktrace(cmState::Snapshot bottom, Entry* cur)
  : Bottom(bottom)
  , Cur(cur)
{
  if (this->Cur) {
    assert(this->Bottom.IsValid());
    this->Cur->Ref();
  }
}

cmListFileBacktrace::cmListFileBacktrace()
  : Bottom()
  , Cur(0)
{
}

cmListFileBacktrace::cmListFileBacktrace(cmState::Snapshot snapshot)
  : Bottom(snapshot.GetCallStackBottom())
  , Cur(0)
{
}

cmListFileBacktrace::cmListFileBacktrace(cmListFileBacktrace const& r)
  : Bottom(r.Bottom)
  , Cur(r.Cur)
{
  if (this->Cur) {
    assert(this->Bottom.IsValid());
    this->Cur->Ref();
  }
}

cmListFileBacktrace& cmListFileBacktrace::operator=(
  cmListFileBacktrace const& r)
{
  cmListFileBacktrace tmp(r);
  std::swap(this->Cur, tmp.Cur);
  std::swap(this->Bottom, tmp.Bottom);
  return *this;
}

cmListFileBacktrace::~cmListFileBacktrace()
{
  if (this->Cur) {
    this->Cur->Unref();
  }
}

cmListFileBacktrace cmListFileBacktrace::Push(std::string const& file) const
{
  // We are entering a file-level scope but have not yet reached
  // any specific line or command invocation within it.  This context
  // is useful to print when it is at the top but otherwise can be
  // skipped during call stack printing.
  cmListFileContext lfc;
  lfc.FilePath = file;
  return cmListFileBacktrace(this->Bottom, this->Cur, lfc);
}

cmListFileBacktrace cmListFileBacktrace::Push(
  cmListFileContext const& lfc) const
{
  return cmListFileBacktrace(this->Bottom, this->Cur, lfc);
}

cmListFileBacktrace cmListFileBacktrace::Pop() const
{
  assert(this->Cur);
  return cmListFileBacktrace(this->Bottom, this->Cur->Up);
}

cmListFileContext const& cmListFileBacktrace::Top() const
{
  if (this->Cur) {
    return *this->Cur;
  } else {
    static cmListFileContext const empty;
    return empty;
  }
}

void cmListFileBacktrace::PrintTitle(std::ostream& out) const
{
  if (!this->Cur) {
    return;
  }
  cmOutputConverter converter(this->Bottom);
  cmListFileContext lfc = *this->Cur;
  if (!this->Bottom.GetState()->GetIsInTryCompile()) {
    lfc.FilePath = converter.Convert(lfc.FilePath, cmOutputConverter::HOME);
  }
  out << (lfc.Line ? " at " : " in ") << lfc;
}

void cmListFileBacktrace::PrintCallStack(std::ostream& out) const
{
  if (!this->Cur || !this->Cur->Up) {
    return;
  }

  bool first = true;
  cmOutputConverter converter(this->Bottom);
  for (Entry* i = this->Cur->Up; i; i = i->Up) {
    if (i->Name.empty()) {
      // Skip this whole-file scope.  When we get here we already will
      // have printed a more-specific context within the file.
      continue;
    }
    if (first) {
      first = false;
      out << "Call Stack (most recent call first):\n";
    }
    cmListFileContext lfc = *i;
    if (!this->Bottom.GetState()->GetIsInTryCompile()) {
      lfc.FilePath = converter.Convert(lfc.FilePath, cmOutputConverter::HOME);
    }
    out << "  " << lfc << "\n";
  }
}

std::ostream& operator<<(std::ostream& os, cmListFileContext const& lfc)
{
  os << lfc.FilePath;
  if (lfc.Line) {
    os << ":" << lfc.Line;
    if (!lfc.Name.empty()) {
      os << " (" << lfc.Name << ")";
    }
  }
  return os;
}

bool operator<(const cmListFileContext& lhs, const cmListFileContext& rhs)
{
  if (lhs.Line != rhs.Line) {
    return lhs.Line < rhs.Line;
  }
  return lhs.FilePath < rhs.FilePath;
}

bool operator==(const cmListFileContext& lhs, const cmListFileContext& rhs)
{
  return lhs.Line == rhs.Line && lhs.FilePath == rhs.FilePath;
}

bool operator!=(const cmListFileContext& lhs, const cmListFileContext& rhs)
{
  return !(lhs == rhs);
}
