/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#include "cmIncludeDirectoryCommand.h"

#include <algorithm>

#include <set>

#include <utility>

#include <cmext/algorithm>

#include "cmExecutionStatus.h"

#include "cmGeneratorExpression.h"

#include "cmMakefile.h"

#include "cmStringAlgorithms.h"

#include "cmSystemTools.h"

#include "cmValue.h"

static void GetIncludes(cmMakefile& mf, std::string const& arg,

                        std::vector<std::string>& incs);

static void NormalizeInclude(cmMakefile& mf, std::string& inc);

bool cmIncludeDirectoryCommand(std::vector<std::string> const& args,

                               cmExecutionStatus& status)

{

  if (args.empty()) {

    return true;

  }

  cmMakefile& mf = status.GetMakefile();

  auto i = args.begin();

  bool before = mf.IsOn("CMAKE_INCLUDE_DIRECTORIES_BEFORE");

  bool system = false;

  if ((*i) == "BEFORE") {

    before = true;

    ++i;

  } else if ((*i) == "AFTER") {

    before = false;

    ++i;

  }

  std::vector<std::string> beforeIncludes;

  std::vector<std::string> afterIncludes;

  std::set<std::string> systemIncludes;

  for (; i != args.end(); ++i) {

    if (*i == "SYSTEM") {

      system = true;

      continue;

    }

    if (i->empty()) {

      status.SetError("given empty-string as include directory.");

      return false;

    }

    std::vector<std::string> includes;

    GetIncludes(mf, *i, includes);

    if (before) {

      cm::append(beforeIncludes, includes);

    } else {

      cm::append(afterIncludes, includes);

    }

    if (system) {

      systemIncludes.insert(includes.begin(), includes.end());

    }

  }

  std::reverse(beforeIncludes.begin(), beforeIncludes.end());

  mf.AddIncludeDirectories(afterIncludes);

  mf.AddIncludeDirectories(beforeIncludes, before);

  mf.AddSystemIncludeDirectories(systemIncludes);

  return true;

}

// do a lot of cleanup on the arguments because this is one place where folks

// sometimes take the output of a program and pass it directly into this

// command not thinking that a single argument could be filled with spaces

// and newlines etc like below:

//

// "   /foo/bar

//    /boo/hoo /dingle/berry "

//

// ideally that should be three separate arguments but when sucking the

// output from a program and passing it into a command the cleanup doesn't

// always happen

//

static void GetIncludes(cmMakefile& mf, std::string const& arg,

                        std::vector<std::string>& incs)

{

  // break apart any line feed arguments

  std::string::size_type pos = 0;

  std::string::size_type lastPos = 0;

  while ((pos = arg.find('\n', lastPos)) != std::string::npos) {

    if (pos) {

      std::string inc = arg.substr(lastPos, pos);

      NormalizeInclude(mf, inc);

      if (!inc.empty()) {

        incs.push_back(std::move(inc));

      }

    }

    lastPos = pos + 1;

  }

  std::string inc = arg.substr(lastPos);

  NormalizeInclude(mf, inc);

  if (!inc.empty()) {

    incs.push_back(std::move(inc));

  }

}

static void NormalizeInclude(cmMakefile& mf, std::string& inc)

{

  std::string::size_type b = inc.find_first_not_of(" \r");

  std::string::size_type e = inc.find_last_not_of(" \r");

  if ((b != std::string::npos) && (e != std::string::npos)) {

    inc.assign(inc, b, 1 + e - b); // copy the remaining substring

  } else {

    inc.clear();

    return;

  }

  if (!cmIsOff(inc)) {

    cmSystemTools::ConvertToUnixSlashes(inc);

    if (!cmSystemTools::FileIsFullPath(inc) &&

        !cmGeneratorExpression::StartsWithGeneratorExpression(inc)) {

      inc = cmStrCat(mf.GetCurrentSourceDirectory(), '/', inc);

    }

  }

}