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#pragma once
#include "compiler.h"
#include "defaults.h"
#include <type_traits>
namespace NPrivate {
struct TStaticBuf {
constexpr TStaticBuf(const char* data, unsigned len) noexcept
: Data(data)
, Len(len)
{
}
template <class T>
constexpr T As() const noexcept {
return T(Data, Len);
}
template <class T>
constexpr operator T() const noexcept {
return this->As<T>();
}
const char* Data;
unsigned Len;
};
#define STATIC_BUF(x) ::NPrivate::TStaticBuf(x, sizeof(x) - 1)
constexpr TStaticBuf ArcRoot = STATIC_BUF(Y_STRINGIZE(ARCADIA_ROOT));
constexpr TStaticBuf BuildRoot = STATIC_BUF(Y_STRINGIZE(ARCADIA_BUILD_ROOT));
constexpr Y_FORCE_INLINE bool IsProperPrefix(const TStaticBuf prefix, const TStaticBuf string) noexcept {
if (prefix.Len < string.Len) {
for (unsigned i = prefix.Len; i-- > 0;) {
if (prefix.Data[i] != string.Data[i]) {
#if defined(_MSC_VER) && !defined(__clang__)
// cl.exe uses back slashes for __FILE__ but ARCADIA_ROOT, ARCADIA_BUILD_ROOT are
// defined with forward slashes
if ((prefix.Data[i] == '/') && (string.Data[i] == '\\')) {
continue;
}
#endif
return false;
}
}
return true;
} else {
return false;
}
}
constexpr unsigned RootPrefixLength(const TStaticBuf& f) noexcept {
if (IsProperPrefix(ArcRoot, f)) {
return ArcRoot.Len + 1;
}
if (IsProperPrefix(BuildRoot, f)) {
return BuildRoot.Len + 1;
}
return 0;
}
constexpr Y_FORCE_INLINE TStaticBuf StripRoot(const TStaticBuf& f, unsigned prefixLength) noexcept {
return TStaticBuf(f.Data + prefixLength, f.Len - prefixLength);
}
//$(SRC_ROOT)/prj/blah.cpp -> prj/blah.cpp
constexpr Y_FORCE_INLINE TStaticBuf StripRoot(const TStaticBuf& f) noexcept {
return StripRoot(f, RootPrefixLength(f));
}
}
#define __SOURCE_FILE_IMPL__ ::NPrivate::StripRoot(STATIC_BUF(__FILE__), std::integral_constant<unsigned, ::NPrivate::RootPrefixLength(STATIC_BUF(__FILE__))>::value)
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