string_utils.cpp

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Author : Olli Etuaho
Date : 2017-10-26 20:03:33
Hash : d255123c
Message : Store shader interface variables as per query spec GLES 3.1 section 7.3.1.1 specifies how active variable entries should be generated and how active variables are named. The specs for program interface variable queries are built on top of this section. ANGLE has already followed this spec for the most part for generating variable lists in ProgramState, but now we also follow the naming spec for arrays and include [0] at the end of the stored name. This will make implementing arrays of arrays more straightforward. Most logic for variable queries will just keep working as is when arrays of arrays are added instead of needing more complex logic for handling array indexing. BUG=angleproject:2125 TEST=angle_end2end_tests Change-Id: I3acd14253153e10bc312114b0303065da2efb506 Reviewed-on: https://chromium-review.googlesource.com/739826 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

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)
    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

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

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