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Copy pathdesktopfilereader.cpp
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Copy pathdesktopfilereader.cpp
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231 lines (185 loc) · 9.85 KB
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// system includes
#include <fstream>
#include <sstream>
#include <unordered_map>
#include <utility>
// local headers
#include "linuxdeploy/desktopfile/desktopfileentry.h"
#include "linuxdeploy/desktopfile/exceptions.h"
#include "desktopfilereader.h"
#include "util.h"
namespace linuxdeploy {
namespace desktopfile {
class DesktopFileReader::PrivateData {
public:
std::string path;
DesktopFile::sections_t sections;
public:
bool isEmpty() {
return sections.empty();
}
void assertPathIsNotEmpty() {
if (path.empty())
throw IOError("empty path is not permitted");
}
void copyData(const std::shared_ptr<PrivateData>& other) {
path = other->path;
sections = other->sections;
}
void parse(std::istream& file) {
std::string line;
bool first = true;
std::string currentSectionName;
while (std::getline(file, line)) {
if (first) {
first = false;
// said to allow handling of UTF-16/32 documents, not entirely sure why
if (line[0] == static_cast<std::string::value_type>(0xEF)) {
line.erase(0, 3);
return;
}
}
if (!line.empty()) {
auto len = line.length();
if (len > 0 &&
!((len >= 2 && (line[0] == '/' && line[1] == '/')) || (len >= 1 && line[0] == '#'))) {
if (line[0] == '[') {
if (line.find_last_of('[') != 0)
throw ParseError("Multiple opening [ brackets");
// this line apparently introduces a new section
auto closingBracketPos = line.find(']');
auto lastClosingBracketPos = line.find_last_of(']');
if (closingBracketPos == std::string::npos)
throw ParseError("No closing ] bracket in section header");
else if (closingBracketPos != lastClosingBracketPos)
throw ParseError("Two or more closing ] brackets in section header");
size_t length = len - 2;
auto title = line.substr(1, closingBracketPos - 1);
// set up the new section
sections.insert(std::make_pair(title, DesktopFile::section_t()));
currentSectionName = std::move(title);
} else {
// we require at least one section to be present in the desktop file
if (currentSectionName.empty())
throw ParseError("No section in desktop file");
auto delimiterPos = line.find('=');
if (delimiterPos == std::string::npos)
throw ParseError("No = key/value delimiter found");
// this line should be a normal key-value pair
std::string key = line.substr(0, delimiterPos);
std::string value = line.substr(delimiterPos + 1, line.size());
// we can strip away any sort of leading or trailing whitespace safely
trim(key);
trim(value);
// empty keys are not allowed for obvious reasons
if (key.empty())
throw ParseError("Empty keys are not allowed");
// check if the string is a potentially localized string
// if yes, parse name and locale out, and check them for validity
std::string entryName, entryLocale;
auto openingBracketPos = key.find('[');
if (openingBracketPos != std::string::npos) {
entryName = key.substr(0, key.find('['));
entryLocale = key.substr(openingBracketPos, key.size());
} else {
entryName = key;
}
// name may only contain A-Za-z- characters according to specification
for (const char c : entryName) {
if (!(
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') ||
(c == '-')
)
) {
throw ParseError("Key " + key + " contains invalid character " + std::string{c});
}
}
// validate locale part
if (!entryLocale.empty()) {
static const auto errorPrefix = "Invalid localization syntax used in key " + key + ": ";
if (std::count(entryLocale.begin(), entryLocale.end(), '[') != 1 ||
std::count(entryLocale.begin(), entryLocale.end(), '[') != 1) {
throw ParseError(errorPrefix + "mismatching [] brackets");
}
// just for clarification: _this_ should never happen, given how the strings are
// split above
if (entryLocale.find('[') != 0) {
throw ParseError(errorPrefix + "invalid [ position");
}
if (entryLocale.find(']') != entryLocale.size()-1) {
throw ParseError(errorPrefix + "invalid ] position");
}
// the syntax within the brackets is not tested by intention, as some KDE apps
// use a locale called "x-test" for some reason
// strict validation of the locale part broke all AppImage builds on the KDE binary
// factory
}
auto& section = sections[currentSectionName];
// keys must be unique in the same section
if (section.find(key) != section.end())
throw ParseError("Key " + key + " found more than once");
section[key] = DesktopFileEntry(key, value);
}
}
}
}
}
};
DesktopFileReader::DesktopFileReader() : d(new PrivateData) {}
DesktopFileReader::DesktopFileReader(std::string path) : DesktopFileReader() {
d->path = std::move(path);
d->assertPathIsNotEmpty();
std::ifstream ifs(d->path);
if (!ifs)
throw IOError("could not open file: " + d->path);
d->parse(ifs);
}
DesktopFileReader::DesktopFileReader(std::istream& is) : DesktopFileReader() {
d->parse(is);
}
DesktopFileReader::DesktopFileReader(const DesktopFileReader& other) : DesktopFileReader() {
d->copyData(other.d);
}
DesktopFileReader& DesktopFileReader::operator=(const DesktopFileReader& other) {
if (this != &other) {
// set up a new instance of PrivateData, and copy data over from other object
d.reset(new PrivateData);
d->copyData(other.d);
}
return *this;
}
DesktopFileReader& DesktopFileReader::operator=(DesktopFileReader&& other) noexcept {
if (this != &other) {
// move other object's data into this one, and remove reference there
d = other.d;
other.d = nullptr;
}
return *this;
}
bool DesktopFileReader::isEmpty() const {
return d->isEmpty();
}
bool DesktopFileReader::operator==(const DesktopFileReader& other) const {
return d->path == other.d->path && d->sections == other.d->sections;
}
bool DesktopFileReader::operator!=(const DesktopFileReader& other) const {
return !operator==(other);
}
std::string DesktopFileReader::path() const {
return d->path;
}
DesktopFile::sections_t DesktopFileReader::data() const {
return d->sections;
}
DesktopFile::section_t DesktopFileReader::operator[](const std::string& name) const {
auto it = d->sections.find(name);
// the map would lazy-initialize a new entry in case the section doesn't exist
// therefore explicitly checking whether the section exists, throwing an exception in case it does not
if (it == d->sections.end())
throw UnknownSectionError(name);
return it->second;
}
}
}
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