osb/source/core/StarAssetPath.cpp
2023-06-24 19:41:52 +10:00

182 lines
4.5 KiB
C++

#include "StarAssetPath.hpp"
#include "StarLexicalCast.hpp"
namespace Star {
// The filename is everything after the last slash (excluding directives) and
// up to the first directive marker.
static Maybe<pair<size_t, size_t>> findFilenameRange(std::string const& pathUtf8) {
size_t firstDirectiveOrSubPath = pathUtf8.find_first_of(":?");
size_t filenameStart = 0;
while (true) {
size_t find = pathUtf8.find('/', filenameStart);
if (find >= firstDirectiveOrSubPath)
break;
filenameStart = find + 1;
}
if (filenameStart == NPos) {
return {};
} else if (firstDirectiveOrSubPath == NPos) {
return {{filenameStart, pathUtf8.size()}};
} else {
return {{filenameStart, firstDirectiveOrSubPath}};
}
}
AssetPath AssetPath::split(String const& path) {
auto i = path.begin();
auto end = path.end();
AssetPath components;
// base paths cannot have any ':' or '?' characters, stop at the first one.
while (i != end) {
String::Char c = *i;
if (c == ':' || c == '?')
break;
components.basePath += c;
++i;
}
// Sub-paths must immediately follow base paths and must start with a ':',
// after this point any further ':' characters are not special.
if (i != end && *i == ':') {
++i;
while (i != end) {
String::Char c = *i;
if (c == '?')
break;
if (!components.subPath)
components.subPath.emplace();
*components.subPath += c;
++i;
}
}
// Directives must follow the base path and optional sub-path, and each
// directive is separated by one or more '?' characters.
while (i != end && *i == '?') {
String directives;
while (i != end) {
directives.append(*i);
++i;
}
if (!directives.empty());
components.directives.append(move(directives));
}
starAssert(i == end);
return components;
}
String AssetPath::join(AssetPath const& components) {
return toString(components);
}
String AssetPath::setSubPath(String const& path, String const& subPath) {
auto components = split(path);
components.subPath = subPath;
return join(components);
}
String AssetPath::removeSubPath(String const& path) {
auto components = split(path);
components.subPath.reset();
return join(components);
}
String AssetPath::getDirectives(String const& path) {
size_t firstDirective = path.find('?');
if (firstDirective == NPos)
return {};
return path.substr(firstDirective + 1);
}
String AssetPath::addDirectives(String const& path, String const& directives) {
return String::joinWith("?", path, directives);
}
String AssetPath::removeDirectives(String const& path) {
size_t firstDirective = path.find('?');
if (firstDirective == NPos)
return path;
return path.substr(0, firstDirective);
}
String AssetPath::directory(String const& path) {
if (auto p = findFilenameRange(path.utf8())) {
return String(path.utf8().substr(0, p->first));
} else {
return String();
}
}
String AssetPath::filename(String const& path) {
if (auto p = findFilenameRange(path.utf8())) {
return String(path.utf8().substr(p->first, p->second));
} else {
return String();
}
}
String AssetPath::extension(String const& path) {
auto file = filename(path);
auto lastDot = file.findLast(".");
if (lastDot == NPos)
return "";
return file.substr(lastDot + 1);
}
String AssetPath::relativeTo(String const& sourcePath, String const& givenPath) {
if (!givenPath.empty() && givenPath[0] == '/')
return givenPath;
auto path = directory(sourcePath);
path.append(givenPath);
return path;
}
bool AssetPath::operator==(AssetPath const& rhs) const {
return tie(basePath, subPath, directives) == tie(rhs.basePath, rhs.subPath, rhs.directives);
}
AssetPath::AssetPath(String const& path) {
*this = move(AssetPath::split(path)); // split code should probably be in here, but whatever
}
AssetPath::AssetPath(String&& basePath, Maybe<String>&& subPath, DirectivesGroup&& directives) {
this->basePath = move(basePath);
this->subPath = move(subPath);
this->directives = move(directives);
}
AssetPath::AssetPath(String const& basePath, Maybe<String> const& subPath, DirectivesGroup const& directives) {
this->basePath = basePath;
this->subPath = subPath;
this->directives = directives;
}
std::ostream& operator<<(std::ostream& os, AssetPath const& rhs) {
os << rhs.basePath;
if (rhs.subPath) {
os << ":";
os << *rhs.subPath;
}
rhs.directives.forEach([&](auto const& entry) {
os << "?";
os << entry.string;
});
return os;
}
}