kc3-lang/angle/src/compiler/preprocessor/numeric_lex.h

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• Author : daniel@transgaming.com
  Date : 2012-10-26 18:58:24
  Hash : b401a92b
  Message : Move the new preprocessor out of the 'new' directory. TRAC #21966 Signed-off-by: Daniel Koch Author: Nicolas Capens git-svn-id: https://angleproject.googlecode.com/svn/trunk@1326 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/preprocessor/numeric_lex.h

• //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // numeric_lex.h: Functions to extract numeric values from string.
  
  #ifndef COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
  #define COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
  
  #include <sstream>
  
  namespace pp {
  
  inline std::ios::fmtflags numeric_base_int(const std::string& str)
  {
      if ((str.size() >= 2) &&
          (str[0] == '0') &&
          (str[1] == 'x' || str[1] == 'X'))
      {
          return std::ios::hex;
      }
      else if ((str.size() >= 1) && (str[0] == '0'))
      {
          return std::ios::oct;
      }
      return std::ios::dec;
  }
  
  // The following functions parse the given string to extract a numerical
  // value of the given type. These functions assume that the string is
  // of the correct form. They can only fail if the parsed value is too big,
  // in which case false is returned.
  
  template<typename IntType>
  bool numeric_lex_int(const std::string& str, IntType* value)
  {
      std::istringstream stream(str);
      // This should not be necessary, but MSVS has a buggy implementation.
      // It returns incorrect results if the base is not specified.
      stream.setf(numeric_base_int(str), std::ios::basefield);
  
      stream >> (*value);
      return !stream.fail();
  }
  
  template<typename FloatType>
  bool numeric_lex_float(const std::string& str, FloatType* value)
  {
      std::istringstream stream(str);
      // Force "C" locale so that decimal character is always '.', and
      // not dependent on the current locale.
      stream.imbue(std::locale::classic());
  
      stream >> (*value);
      return !stream.fail();
  }
  
  } // namespace pp.
  #endif // COMPILER_PREPROCESSOR_NUMERIC_LEX_H_