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#include "pathsplit.h"
#include <util/stream/output.h>
#include <util/generic/yexception.h>
template <class T>
static inline size_t ToReserve(const T& t) {
size_t ret = t.size() + 5;
for (auto it = t.begin(); it != t.end(); ++it) {
ret += it->size();
}
return ret;
}
void TPathSplitTraitsUnix::DoParseFirstPart(const TStringBuf part) {
if (part == TStringBuf(".")) {
push_back(TStringBuf("."));
return;
}
if (IsAbsolutePath(part)) {
IsAbsolute = true;
}
DoParsePart(part);
}
void TPathSplitTraitsUnix::DoParsePart(const TStringBuf part0) {
DoAppendHint(part0.size() / 8);
TStringBuf next(part0);
TStringBuf part;
while (TStringBuf(next).TrySplit('/', part, next)) {
AppendComponent(part);
}
AppendComponent(next);
}
void TPathSplitTraitsWindows::DoParseFirstPart(const TStringBuf part0) {
TStringBuf part(part0);
if (part == TStringBuf(".")) {
push_back(TStringBuf("."));
return;
}
if (IsAbsolutePath(part)) {
IsAbsolute = true;
if (part.size() > 1 && part[1] == ':') {
Drive = part.SubStr(0, 2);
part = part.SubStr(2);
}
}
DoParsePart(part);
}
void TPathSplitTraitsWindows::DoParsePart(const TStringBuf part0) {
DoAppendHint(part0.size() / 8);
size_t pos = 0;
TStringBuf part(part0);
while (pos < part.size()) {
while (pos < part.size() && this->IsPathSep(part[pos])) {
++pos;
}
const char* begin = part.data() + pos;
while (pos < part.size() && !this->IsPathSep(part[pos])) {
++pos;
}
AppendComponent(TStringBuf(begin, part.data() + pos));
}
}
TString TPathSplitStore::DoReconstruct(const TStringBuf slash) const {
TString r;
r.reserve(ToReserve(*this));
if (IsAbsolute) {
r.AppendNoAlias(Drive);
r.AppendNoAlias(slash);
}
for (auto i = begin(); i != end(); ++i) {
if (i != begin()) {
r.AppendNoAlias(slash);
}
r.AppendNoAlias(*i);
}
return r;
}
void TPathSplitStore::AppendComponent(const TStringBuf comp) {
if (!comp || comp == TStringBuf(".")) {
; // ignore
} else if (comp == TStringBuf("..") && !empty() && back() != TStringBuf("..")) {
pop_back();
} else {
// push back first .. also
push_back(comp);
}
}
TStringBuf TPathSplitStore::Extension() const {
return size() > 0 ? CutExtension(back()) : TStringBuf();
}
template <>
void Out<TPathSplit>(IOutputStream& o, const TPathSplit& ps) {
o << ps.Reconstruct();
}
TString JoinPaths(const TPathSplit& p1, const TPathSplit& p2) {
if (p2.IsAbsolute) {
ythrow yexception() << "can not join " << p1 << " and " << p2;
}
return TPathSplit(p1).AppendMany(p2.begin(), p2.end()).Reconstruct();
}
TStringBuf CutExtension(const TStringBuf fileName) {
if (fileName.empty()) {
return fileName;
}
TStringBuf name;
TStringBuf extension;
fileName.RSplit('.', name, extension);
if (name.empty()) {
// dot at a start or not found
return name;
} else {
return extension;
}
}
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