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

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

#include "cmCMakePolicyCommand.h"

#include "cmExecutionStatus.h"

#include "cmMakefile.h"

#include "cmPolicies.h"

#include "cmStringAlgorithms.h"

namespace {

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

                   cmExecutionStatus& status);

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

                   cmExecutionStatus& status);

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

                       cmExecutionStatus& status);

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

                          cmExecutionStatus& status);

}

// cmCMakePolicyCommand

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

                          cmExecutionStatus& status)

{

  if (args.empty()) {

    status.SetError("requires at least one argument.");

    return false;

  }

  if (args[0] == "SET") {

    return HandleSetMode(args, status);

  }

  if (args[0] == "GET") {

    return HandleGetMode(args, status);

  }

  if (args[0] == "PUSH") {

    if (args.size() > 1) {

      status.SetError("PUSH may not be given additional arguments.");

      return false;

    }

    status.GetMakefile().PushPolicy();

    return true;

  }

  if (args[0] == "POP") {

    if (args.size() > 1) {

      status.SetError("POP may not be given additional arguments.");

      return false;

    }

    status.GetMakefile().PopPolicy();

    return true;

  }

  if (args[0] == "VERSION") {

    return HandleVersionMode(args, status);

  }

  if (args[0] == "GET_WARNING") {

    return HandleGetWarningMode(args, status);

  }

  status.SetError(cmStrCat("given unknown first argument \"", args[0], '"'));

  return false;

}

namespace {

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

                   cmExecutionStatus& status)

{

  if (args.size() != 3) {

    status.SetError("SET must be given exactly 2 additional arguments.");

    return false;

  }

  cmPolicies::PolicyStatus policyStatus;

  if (args[2] == "OLD") {

    policyStatus = cmPolicies::OLD;

  } else if (args[2] == "NEW") {

    policyStatus = cmPolicies::NEW;

  } else {

    status.SetError(

      cmStrCat("SET given unrecognized policy status \"", args[2], '"'));

    return false;

  }

  if (!status.GetMakefile().SetPolicy(args[1].c_str(), policyStatus)) {

    status.SetError("SET failed to set policy.");

    return false;

  }

  return true;

}

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

                   cmExecutionStatus& status)

{

  bool parent_scope = false;

  if (args.size() == 4 && args[3] == "PARENT_SCOPE") {

    // Undocumented PARENT_SCOPE option for use within CMake.

    parent_scope = true;

  } else if (args.size() != 3) {

    status.SetError("GET must be given exactly 2 additional arguments.");

    return false;

  }

  // Get arguments.

  std::string const& id = args[1];

  std::string const& var = args[2];

  // Lookup the policy number.

  cmPolicies::PolicyID pid;

  if (!cmPolicies::GetPolicyID(id.c_str(), pid)) {

    status.SetError(

      cmStrCat("GET given policy \"", id,

               "\" which is not known to this version of CMake."));

    return false;

  }

  // Lookup the policy setting.

  cmPolicies::PolicyStatus policyStatus =

    status.GetMakefile().GetPolicyStatus(pid, parent_scope);

  switch (policyStatus) {

    case cmPolicies::OLD:

      // Report that the policy is set to OLD.

      status.GetMakefile().AddDefinition(var, "OLD");

      break;

    case cmPolicies::WARN:

      // Report that the policy is not set.

      status.GetMakefile().AddDefinition(var, "");

      break;

    case cmPolicies::NEW:

      // Report that the policy is set to NEW.

      status.GetMakefile().AddDefinition(var, "NEW");

      break;

  }

  return true;

}

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

                       cmExecutionStatus& status)

{

  if (args.size() <= 1) {

    status.SetError("VERSION not given an argument");

    return false;

  }

  if (args.size() >= 3) {

    status.SetError("VERSION given too many arguments");

    return false;

  }

  std::string const& version_string = args[1];

  // Separate the <min> version and any trailing ...<max> component.

  std::string::size_type const dd = version_string.find("...");

  std::string const version_min = version_string.substr(0, dd);

  std::string const version_max = dd != std::string::npos

    ? version_string.substr(dd + 3, std::string::npos)

    : std::string();

  if (dd != std::string::npos &&

      (version_min.empty() || version_max.empty())) {

    status.SetError(

      cmStrCat("VERSION \"", version_string,

               R"(" does not have a version on both sides of "...".)"));

    return false;

  }

  return status.GetMakefile().SetPolicyVersion(version_min, version_max);

}

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

                          cmExecutionStatus& status)

{

  if (args.size() != 3) {

    status.SetError(

      "GET_WARNING must be given exactly 2 additional arguments.");

    return false;

  }

  // Get arguments.

  std::string const& id = args[1];

  std::string const& var = args[2];

  // Lookup the policy number.

  cmPolicies::PolicyID pid;

  if (!cmPolicies::GetPolicyID(id.c_str(), pid)) {

    status.SetError(

      cmStrCat("GET_WARNING given policy \"", id,

               "\" which is not known to this version of CMake."));

    return false;

  }

  // Lookup the policy warning.

  status.GetMakefile().AddDefinition(var, cmPolicies::GetPolicyWarning(pid));

  return true;

}

}