/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

#include "RuntimeMetaData.h"

using namespace antlr4;

const std::string RuntimeMetaData::VERSION = "4.7.2";

std::string RuntimeMetaData::getRuntimeVersion() {
  return VERSION;
}

void RuntimeMetaData::checkVersion(const std::string &generatingToolVersion, const std::string &compileTimeVersion) {
  std::string runtimeVersion = VERSION;
  bool runtimeConflictsWithGeneratingTool = false;
  bool runtimeConflictsWithCompileTimeTool = false;

  if (generatingToolVersion != "") {
    runtimeConflictsWithGeneratingTool = runtimeVersion != generatingToolVersion
      && getMajorMinorVersion(runtimeVersion) != getMajorMinorVersion(generatingToolVersion);
  }

  runtimeConflictsWithCompileTimeTool = runtimeVersion != compileTimeVersion
    && getMajorMinorVersion(runtimeVersion) != getMajorMinorVersion(compileTimeVersion);

  if (runtimeConflictsWithGeneratingTool) {
    std::cerr << "ANTLR Tool version " << generatingToolVersion << " used for code generation does not match "
      "the current runtime version " << runtimeVersion << std::endl;
  }
  if (runtimeConflictsWithCompileTimeTool) {
    std::cerr << "ANTLR Runtime version " << compileTimeVersion << " used for parser compilation does not match "
      "the current runtime version " << runtimeVersion << std::endl;
  }
}

std::string RuntimeMetaData::getMajorMinorVersion(const std::string &version) {
  size_t firstDot = version.find('.');
  size_t secondDot = firstDot != std::string::npos ? version.find('.', firstDot + 1) : std::string::npos;
  size_t firstDash = version.find('-');
  size_t referenceLength = version.size();
  if (secondDot != std::string::npos) {
    referenceLength = std::min(referenceLength, secondDot);
  }

  if (firstDash != std::string::npos) {
    referenceLength = std::min(referenceLength, firstDash);
  }

  return version.substr(0, referenceLength);
}
