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//
// 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)
size_t written = mbstowcs(wcstring.data(), cString, length + 1);
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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