kc3-lang/angle/src/common/string_utils.cpp

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• Hash : ca5c1059
  Author :
  Date : 2018-02-05T19:21:11
  

  Replace a POSIX API call not supported by Fuchsia.
  
  Bug: chromium:809201
  
  Change-Id: Iafc2e7efe92bcb977e5185901c073e499114a9f4
  Reviewed-on: https://chromium-review.googlesource.com/903261
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/common/string_utils.cpp

• //
  // Copyright 2015 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.
  //
  // string_utils:
  //   String helper functions.
  //
  
  #include "string_utils.h"
  
  #include <algorithm>
  #include <stdlib.h>
  #include <string.h>
  #include <fstream>
  #include <sstream>
  
  #include "common/platform.h"
  
  namespace angle
  {
  
  const char kWhitespaceASCII[] = " \f\n\r\t\v";
  
  std::vector<std::string> SplitString(const std::string &input,
                                       const std::string &delimiters,
                                       WhitespaceHandling whitespace,
                                       SplitResult resultType)
  {
      std::vector<std::string> result;
      if (input.empty())
      {
          return result;
      }
  
      std::string::size_type start = 0;
      while (start != std::string::npos)
      {
          auto end = input.find_first_of(delimiters, start);
  
          std::string piece;
          if (end == std::string::npos)
          {
              piece = input.substr(start);
              start = std::string::npos;
          }
          else
          {
              piece = input.substr(start, end - start);
              start = end + 1;
          }
  
          if (whitespace == TRIM_WHITESPACE)
          {
              piece = TrimString(piece, kWhitespaceASCII);
          }
  
          if (resultType == SPLIT_WANT_ALL || !piece.empty())
          {
              result.push_back(piece);
          }
      }
  
      return result;
  }
  
  void SplitStringAlongWhitespace(const std::string &input,
                                  std::vector<std::string> *tokensOut)
  {
  
      std::istringstream stream(input);
      std::string line;
  
      while (std::getline(stream, line))
      {
          size_t prev = 0, pos;
          while ((pos = line.find_first_of(kWhitespaceASCII, prev)) != std::string::npos)
          {
              if (pos > prev)
                  tokensOut->push_back(line.substr(prev, pos - prev));
              prev = pos + 1;
          }
          if (prev < line.length())
              tokensOut->push_back(line.substr(prev, std::string::npos));
      }
  }
  
  std::string TrimString(const std::string &input, const std::string &trimChars)
  {
      auto begin = input.find_first_not_of(trimChars);
      if (begin == std::string::npos)
      {
          return "";
      }
  
      std::string::size_type end = input.find_last_not_of(trimChars);
      if (end == std::string::npos)
      {
          return input.substr(begin);
      }
  
      return input.substr(begin, end - begin + 1);
  }
  
  bool HexStringToUInt(const std::string &input, unsigned int *uintOut)
  {
      unsigned int offset = 0;
  
      if (input.size() >= 2 && input[0] == '0' && input[1] == 'x')
      {
          offset = 2u;
      }
  
      // Simple validity check
      if (input.find_first_not_of("0123456789ABCDEFabcdef", offset) != std::string::npos)
      {
          return false;
      }
  
      std::stringstream inStream(input);
      inStream >> std::hex >> *uintOut;
      return !inStream.fail();
  }
  
  bool ReadFileToString(const std::string &path, std::string *stringOut)
  {
      std::ifstream inFile(path.c_str());
      if (inFile.fail())
      {
          return false;
      }
  
      inFile.seekg(0, std::ios::end);
      stringOut->reserve(static_cast<std::string::size_type>(inFile.tellg()));
      inFile.seekg(0, std::ios::beg);
  
      stringOut->assign(std::istreambuf_iterator<char>(inFile), std::istreambuf_iterator<char>());
      return !inFile.fail();
  }
  
  Optional<std::vector<wchar_t>> WidenString(size_t length, const char *cString)
  {
      std::vector<wchar_t> wcstring(length + 1);
  #if !defined(ANGLE_PLATFORM_WINDOWS)
      mbstate_t mbstate = {};
      size_t written = mbsrtowcs(wcstring.data(), &cString, length + 1, &mbstate);
      if (written == 0)
      {
          return Optional<std::vector<wchar_t>>::Invalid();
      }
  #else
      size_t convertedChars = 0;
      errno_t err = mbstowcs_s(&convertedChars, wcstring.data(), length + 1, cString, _TRUNCATE);
      if (err != 0)
      {
          return Optional<std::vector<wchar_t>>::Invalid();
      }
  #endif
      return Optional<std::vector<wchar_t>>(wcstring);
  }
  
  bool BeginsWith(const std::string &str, const std::string &prefix)
  {
      return strncmp(str.c_str(), prefix.c_str(), prefix.length()) == 0;
  }
  
  bool BeginsWith(const std::string &str, const char *prefix)
  {
      return strncmp(str.c_str(), prefix, strlen(prefix)) == 0;
  }
  
  bool BeginsWith(const char *str, const char *prefix)
  {
      return strncmp(str, prefix, strlen(prefix)) == 0;
  }
  
  bool BeginsWith(const std::string &str, const std::string &prefix, const size_t prefixLength)
  {
      return strncmp(str.c_str(), prefix.c_str(), prefixLength) == 0;
  }
  
  bool EndsWith(const std::string &str, const char *suffix)
  {
      const auto len = strlen(suffix);
      if (len > str.size())
          return false;
  
      const char *end = str.c_str() + str.size() - len;
  
      return memcmp(end, suffix, len) == 0;
  }
  
  void ToLower(std::string *str)
  {
      for (auto &ch : *str)
      {
          ch = static_cast<char>(::tolower(ch));
      }
  }
  
  bool ReplaceSubstring(std::string *str,
                        const std::string &substring,
                        const std::string &replacement)
  {
      size_t replacePos = str->find(substring);
      if (replacePos == std::string::npos)
      {
          return false;
      }
      str->replace(replacePos, substring.size(), replacement);
      return true;
  }
  
  }  // namespace angle
  

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