cocos_lib/cocos/base/StringUtil.cpp

/****************************************************************************
 Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.

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#include "StringUtil.h"

#include <algorithm>
#include <cctype>
#include <cstdarg>
#ifndef CC_WGPU_WASM
    #include "base/ZipUtils.h"
#endif
#include "base/base64.h"
#include "base/std/container/string.h"
#include "memory/Memory.h"

#if (CC_PLATFORM == CC_PLATFORM_WINDOWS)
    #ifndef WIN32_LEAN_AND_MEAN
        #define WIN32_LEAN_AND_MEAN
    #endif
    #include <Windows.h>
#endif

namespace cc {

#if defined(_WIN32)
int StringUtil::vprintf(char *buf, const char *last, const char *fmt, va_list args) {
    if (last <= buf) return 0;

    int count = (int)(last - buf);
    int ret = _vsnprintf_s(buf, count, _TRUNCATE, fmt, args);
    if (ret < 0) {
        if (errno == 0) {
            return count - 1;
        } else {
            return 0;
        }
    } else {
        return ret;
    }
}
#else
int StringUtil::vprintf(char *buf, const char *last, const char *fmt, va_list args) {
    if (last <= buf) {
        return 0;
    }

    auto count = static_cast<int>(last - buf);
    int ret = vsnprintf(buf, count, fmt, args);
    if (ret >= count - 1) {
        return count - 1;
    }
    if (ret < 0) {
        return 0;
    }
    return ret;
}
#endif

int StringUtil::printf(char *buf, const char *last, const char *fmt, ...) {
    va_list args;
    va_start(args, fmt);
    int ret = vprintf(buf, last, fmt, args);
    va_end(args);
    return ret;
}

ccstd::string StringUtil::format(const char *fmt, ...) {
    char sz[4096];
    va_list args;
    va_start(args, fmt);
    vprintf(sz, sz + sizeof(sz) - 1, fmt, args);
    va_end(args);
    return sz;
}

ccstd::vector<ccstd::string> StringUtil::split(const ccstd::string &str, const ccstd::string &delims, uint32_t maxSplits) {
    ccstd::vector<ccstd::string> strs;
    if (str.empty()) {
        return strs;
    }

    // Pre-allocate some space for performance
    strs.reserve(maxSplits ? maxSplits + 1 : 16); // 16 is guessed capacity for most case

    uint32_t numSplits{0};

    // Use STL methods
    size_t start{0};
    size_t pos{0};
    do {
        pos = str.find_first_of(delims, start);
        if (pos == start) {
            // Do nothing
            start = pos + 1;
        } else if (pos == ccstd::string::npos || (maxSplits && numSplits == maxSplits)) {
            // Copy the rest of the string
            strs.push_back(str.substr(start));
            break;
        } else {
            // Copy up to delimiter
            strs.push_back(str.substr(start, pos - start));
            start = pos + 1;
        }
        // parse up to next real data
        start = str.find_first_not_of(delims, start);
        ++numSplits;
    } while (pos != ccstd::string::npos);

    return strs;
}

ccstd::string &StringUtil::replace(ccstd::string &str, const ccstd::string &findStr, const ccstd::string &replaceStr) {
    size_t startPos = str.find(findStr);
    if (startPos == ccstd::string::npos) {
        return str;
    }
    str.replace(startPos, findStr.length(), replaceStr);
    return str;
}

ccstd::string &StringUtil::replaceAll(ccstd::string &str, const ccstd::string &findStr, const ccstd::string &replaceStr) {
    if (findStr.empty()) {
        return str;
    }
    size_t startPos = 0;
    while ((startPos = str.find(findStr, startPos)) != ccstd::string::npos) {
        str.replace(startPos, findStr.length(), replaceStr);
        startPos += replaceStr.length();
    }
    return str;
}

ccstd::string &StringUtil::tolower(ccstd::string &str) {
    std::transform(str.begin(), str.end(), str.begin(),
                   [](unsigned char c) { return std::tolower(c); });
    return str;
}

ccstd::string &StringUtil::toupper(ccstd::string &str) {
    std::transform(str.begin(), str.end(), str.begin(),
                   [](unsigned char c) { return std::toupper(c); });
    return str;
}

ccstd::string GzipedString::value() const { // NOLINT(readability-convert-member-functions-to-static)
#ifndef CC_WGPU_WASM
    uint8_t *outGzip{nullptr};
    uint8_t *outBase64{nullptr};
    auto *input = reinterpret_cast<unsigned char *>(const_cast<char *>(_str.c_str()));
    auto lenOfBase64 = base64Decode(input, static_cast<unsigned int>(_str.size()), &outBase64);
    auto lenofUnzip = ZipUtils::inflateMemory(outBase64, static_cast<uint32_t>(lenOfBase64), &outGzip);
    ccstd::string ret(outGzip, outGzip + lenofUnzip);
    free(outGzip);
    free(outBase64);
    return ret;
#else
    return "";
#endif
}

} // namespace cc