PathUtils.h

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#pragma once
#include "RawBuffer.h"
 
namespace catapult { namespace utils {
 
    constexpr bool IsDirectorySeparator(char ch) {
#ifdef _WIN32
        return '\\' == ch || '/' == ch;
#else
        return '/' == ch;
#endif
    }
 
    constexpr const char* AdvanceToEnd(const char* str) {
        const auto* pEnd = str;
        while (*pEnd != '\0') ++pEnd;
        return pEnd;
    }
 
    constexpr const char* ExtractFilename(const char* fullPath) {
        const auto* pEnd = AdvanceToEnd(fullPath);
        for (const auto* pCh = pEnd - 1; pCh >= fullPath; --pCh) {
            if (IsDirectorySeparator(*pCh))
                return pCh + 1;
        }
 
        return fullPath;
    }
 
    constexpr const char* ExtractDirectoryAndFilename(const char* fullPath) {
        const auto* pEnd = ExtractFilename(fullPath);
 
        // skip consecutive directory separators
        const auto* pCh = pEnd - 1;
        for (; pCh >= fullPath; --pCh) {
            if (!IsDirectorySeparator(*pCh))
                break;
        }
 
        // find next directory separator
        for (; pCh >= fullPath; --pCh) {
            if (IsDirectorySeparator(*pCh))
                return pCh + 1;
        }
 
        return fullPath;
    }
 
    constexpr RawString ExtractDirectoryName(const char* fullPath) {
        const auto* pDirectoryName = ExtractDirectoryAndFilename(fullPath);
        const auto* pEnd = ExtractFilename(fullPath);
 
        const auto* pCh = pDirectoryName;
        for (; pCh < pEnd; ++pCh) {
            if (IsDirectorySeparator(*pCh))
                break;
        }
 
        return { pDirectoryName, static_cast<size_t>(pCh - pDirectoryName) };
    }
}}