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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 <fstream>
#include <sstream>
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();
}
}
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