/*

  This file is part of solidity.

  solidity is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  solidity is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with solidity.  If not, see <http://www.gnu.org/licenses/>.

*/

#pragma once

namespace solidity::langutil

{

inline bool isDecimalDigit(char c)

{

  return '0' <= c && c <= '9';

}

inline bool isHexDigit(char c)

{

  return

    isDecimalDigit(c) ||

    ('a' <= c && c <= 'f') ||

    ('A' <= c && c <= 'F');

}

inline bool isWhiteSpace(char c)

{

  return c == ' ' || c == '\n' || c == '\t' || c == '\r';

}

inline bool isIdentifierStart(char c)

{

  return c == '_' || c == '$' || ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');

}

inline bool isIdentifierPart(char c)

{

  return isIdentifierStart(c) || isDecimalDigit(c);

}

inline int hexValue(char c)

{

  if (c >= '0' && c <= '9')

    return c - '0';

  else if (c >= 'a' && c <= 'f')

    return c - 'a' + 10;

  else if (c >= 'A' && c <= 'F')

    return c - 'A' + 10;

  else return -1;

}

}