string Decode::Read(string input)
{
preBuffer+=input;
string s;
size_t i;
char c;
for(i=0;i<preBuffer.size();++i)
{
c = preBuffer[i];
switch(state) //what state are we in
{
case WHITE: //reading whitespace
if (isspace(c) ) break; //keep reading
if( isdigit(c) ) //digit, switch states
{
buffer+=c;
state=DIGIT;
}
else //non-white, non-digit
{
string s="Parse Error: Bad input, expected digit";
throw ParsingError(s.c_str());
}
break;
case DIGIT:
if(isdigit(c)) //keep adding to buffer
{
buffer+=c;
break;
}
if(c==':') //end of buffer size
{
state=COUNT; //change to count state
count=atoi( buffer.c_str() ); //build _count
buffer.erase();//empty the internal buffer
}
else //found a non-digit, non-colon
{
string s="Parse Error: Bad input, expected digit or colon";
throw ParsingError(s.c_str());
}
break;
case COUNT://reading count number of bytes
buffer+=c;
count--;
if(count==0) //done reading, return the string
{
state=WHITE;//reset the state
s=buffer;
buffer.erase();
}
break;
}
if(s.size()>0) break;
}
preBuffer.erase(0,i+1);
return s;
}
void Parsing::getCommands(std::istream &in, Core *core) {
std::string line;
if (in) {
while (getline(in, line)) {
if (in == std::cin and line.find(";;") != line.npos) {
break;
}
if (line.size() != 0 and line.at(0) != ';') {
if (line.find_first_of(';') != line.npos) {
line.erase(line.find_first_of(';'), line.npos);
}
if (line == "exit") {
this->_exit = true;
}
try {
this->commandLine(line, core);
} catch (const ParsingError &error) {
throw ParsingError(this->getErrorLine(error.what()));
}
}
this->_line++;
}
if (this->_exit == false) {
throw ParsingError("You must finish your commands file with exit instruction");
}
} else {
throw ParsingError("Commands file does not exists");
}
}
void Parsing::checkElements(const std::string &instr) {
if (instr == "pop" and this->_elements == 0) {
throw ParsingError("Pop instruction on an empty list");
} else if ((instr == "add" or instr == "sub" or instr == "mul" or instr == "div" or instr == "mod") and this->_elements < 2) {
throw ParsingError("Calculate instruction on a list without more 2 elements");
} else if ((instr == "add" or instr == "sub" or instr == "mul" or instr == "div" or instr == "mod" or instr == "pop")) {
this->_elements--;
} else if (instr == "push") {
this->_elements++;
}
}
void Parsing::commandLine(const std::string &line, Core *core) {
std::istringstream word(line);
std::string instruction;
std::string type;
std::string value;
bool status = false;
word >> instruction;
word >> type;
if (!type.empty()) {
if (type.find('(') != type.npos and type.find(')') != type.npos) {
value = type.substr(type.find_first_of('(') + 1);
value = value.substr(0, value.find_last_of(')'));
type.erase(type.find_first_of('('), type.npos);
status = true;
} else {
throw ParsingError("A value between () was expected");
}
}
if (std::find(this->_instructions.begin(), this->_instructions.end(), std::make_pair(instruction, status)) == this->_instructions.end()) {
throw ParsingError("Undefined instruction");
} else {
if (!type.empty() and this->_values.find(type) == this->_values.end()) {
throw ParsingError("Undefined type");
} else {
try {
this->checkElements(instruction);
} catch (const ParsingError &error) {
throw ParsingError(error.what());
}
try {
this->isNumber(value);
} catch (const ParsingError &error) {
throw ParsingError(error.what());
}
this->createInstruction(instruction, type, value, core);
}
}
}
void Parsing::isNumber(const std::string &value) {
std::string::const_iterator it = value.begin();
while (it != value.end()) {
if (!std::isdigit(*it) and *it != '.' and *it != '-') {
throw ParsingError("Value is not a number");
} else {
*it++;
}
}
}
void Parsing::createInstruction(const std::string &instr, const std::string &type, const std::string &value, Core *core) {
Hatchery hatchery;
if (this->_map.find(instr) != this->_map.end()) {
try {
IOperand *operand = hatchery.createOperand(this->_values[type], value);
core->pushMemoryInstruction(this->_map[instr], operand);
} catch (const std::exception &error) {
throw ParsingError(error.what());
}
}
}
Form Parser::parse() const
{
Form ast;
auto it = tokens.cbegin();
while (it != tokens.cend()) {
if (*it != "(") {
std::ostringstream ss;
ss << "Error: token " << *it << "is not in an expression";
throw ParsingError(ss.str());
}
ast.push_back(parse_expr(++it, tokens.cend()));
}
return ast;
}
void SubsonicLibraryScanner::OnGetAlbumFinished(QNetworkReply* reply) {
reply->deleteLater();
pending_requests_.remove(reply);
QXmlStreamReader reader(reply);
reader.readNextStartElement();
if (reader.name() != "subsonic-response") {
ParsingError("Not a subsonic-response. Aborting scan.");
return;
}
if (reader.attributes().value("status") != "ok") {
// TODO(Alan Briolat): error handling
return;
}
// Read album information
reader.readNextStartElement();
if (reader.name() != "album") {
ParsingError("album tag expected. Aborting scan.");
return;
}
QString album_artist = reader.attributes().value("artist").toString();
// Read song information
while (reader.readNextStartElement()) {
if (reader.name() != "song") {
ParsingError("song tag expected. Aborting scan.");
return;
}
Song song;
QString id = reader.attributes().value("id").toString();
song.set_title(reader.attributes().value("title").toString());
song.set_album(reader.attributes().value("album").toString());
song.set_track(reader.attributes().value("track").toString().toInt());
song.set_disc(reader.attributes().value("discNumber").toString().toInt());
song.set_artist(reader.attributes().value("artist").toString());
song.set_albumartist(album_artist);
song.set_bitrate(reader.attributes().value("bitRate").toString().toInt());
song.set_year(reader.attributes().value("year").toString().toInt());
song.set_genre(reader.attributes().value("genre").toString());
qint64 length = reader.attributes().value("duration").toString().toInt();
length *= kNsecPerSec;
song.set_length_nanosec(length);
QUrl url = QUrl(QString("subsonic://%1").arg(id));
song.set_url(url);
song.set_filesize(reader.attributes().value("size").toString().toInt());
// We need to set these to satisfy the database constraints
song.set_directory_id(0);
song.set_mtime(0);
song.set_ctime(0);
songs_ << song;
reader.skipCurrentElement();
}
// Start the next request if albums remain
if (!album_queue_.empty()) {
GetAlbum(album_queue_.dequeue());
}
// If this was the last response, we're done!
if (album_queue_.empty() && pending_requests_.empty()) {
scanning_ = false;
emit ScanFinished();
}
}
void SubsonicLibraryScanner::OnGetAlbumListFinished(QNetworkReply* reply,
int offset) {
reply->deleteLater();
bool skip_read_albums = false;
QXmlStreamReader reader(reply);
reader.readNextStartElement();
if (reader.name() != "subsonic-response") {
ParsingError("Not a subsonic-response. Aborting scan.");
return;
}
if (reader.attributes().value("status") != "ok") {
reader.readNextStartElement();
int error = reader.attributes().value("code").toString().toInt();
// Compatibility with Ampache :
// When there is no data, Ampache returns NotFound
// whereas Subsonic returns empty albumList2 tag
switch (error) {
case SubsonicService::ApiError_NotFound:
skip_read_albums = true;
break;
default:
ParsingError("Response status not ok. Aborting scan.");
return;
}
}
int albums_added = 0;
if (!skip_read_albums) {
reader.readNextStartElement();
if (reader.name() != "albumList2") {
ParsingError("albumList2 tag expected. Aborting scan.");
return;
}
while (reader.readNextStartElement()) {
if (reader.name() != "album") {
ParsingError("album tag expected. Aborting scan.");
return;
}
album_queue_ << reader.attributes().value("id").toString();
albums_added++;
reader.skipCurrentElement();
}
}
if (albums_added > 0) {
// Non-empty reply means potentially more albums to fetch
GetAlbumList(offset + kAlbumChunkSize);
} else if (album_queue_.size() == 0) {
// Empty reply and no albums means an empty Subsonic server
scanning_ = false;
emit ScanFinished();
} else {
// Empty reply but we have some albums, time to start fetching songs
// Start up the maximum number of concurrent requests, finished requests get
// replaced with new ones
for (int i = 0; i < kConcurrentRequests && !album_queue_.empty(); ++i) {
GetAlbum(album_queue_.dequeue());
}
}
}
// Parsing
QHash<QString, QVariant> ParserPrivate::parse(QStringList argv)
{
QHash<QString, QVariant> map;
QStringListIterator it(argv);
QString programName = it.next();
QString optionPrefix;
QString flagPrefix;
QListIterator<ParameterDefinition *> positionals(m_positionals);
QStringList expecting;
getPrefix(optionPrefix, flagPrefix);
while (it.hasNext())
{
QString arg = it.next();
if (!expecting.isEmpty())
// we were expecting an argument
{
QString name = expecting.first();
if (map.contains(name))
throw ParsingError(
QString("Option %2%1 was given multiple times").arg(name, optionPrefix));
map[name] = QVariant(arg);
expecting.removeFirst();
continue;
}
if (arg.startsWith(optionPrefix))
// we have an option
{
// qDebug("Found option %s", qPrintable(arg));
QString name = arg.mid(optionPrefix.length());
QString equals;
if ((m_argStyle == ArgumentStyle::Equals ||
m_argStyle == ArgumentStyle::SpaceAndEquals) &&
name.contains("="))
{
int i = name.indexOf("=");
equals = name.mid(i + 1);
name = name.left(i);
}
if (m_longLookup.contains(name))
{
ParameterDefinition *param = m_longLookup[name];
if (map.contains(param->name))
throw ParsingError(QString("Option %2%1 was given multiple times")
.arg(param->name, optionPrefix));
if (param->type == DefinitionType::Switch)
map[param->name] = !param->defaultValue.toBool();
else // if (param->type == DefinitionType::Option)
{
if (m_argStyle == ArgumentStyle::Space)
expecting.append(param->name);
else if (!equals.isNull())
map[param->name] = equals;
else if (m_argStyle == ArgumentStyle::SpaceAndEquals)
expecting.append(param->name);
else
throw ParsingError(QString("Option %2%1 reqires an argument.")
.arg(name, optionPrefix));
}
continue;
}
// We need to fall through if the prefixes match
if (optionPrefix != flagPrefix)
throw ParsingError(QString("Unknown Option %2%1").arg(name, optionPrefix));
}
if (arg.startsWith(flagPrefix))
// we have (a) flag(s)
{
// qDebug("Found flags %s", qPrintable(arg));
QString flags = arg.mid(flagPrefix.length());
QString equals;
if ((m_argStyle == ArgumentStyle::Equals ||
m_argStyle == ArgumentStyle::SpaceAndEquals) &&
flags.contains("="))
{
int i = flags.indexOf("=");
equals = flags.mid(i + 1);
flags = flags.left(i);
}
for (int i = 0; i < flags.length(); i++)
{
QChar flag = flags.at(i);
if (!m_flagLookup.contains(flag))
throw ParsingError(QString("Unknown flag %2%1").arg(flag, flagPrefix));
ParameterDefinition *param = m_flagLookup[flag];
if (map.contains(param->name))
throw ParsingError(QString("Option %2%1 was given multiple times")
.arg(param->name, optionPrefix));
if (param->type == DefinitionType::Switch)
map[param->name] = !param->defaultValue.toBool();
else // if (param->type == DefinitionType::Option)
{
if (m_argStyle == ArgumentStyle::Space)
expecting.append(param->name);
else if (!equals.isNull())
if (i == flags.length() - 1)
map[param->name] = equals;
else
throw ParsingError(QString("Flag %4%2 of Argument-requiring Option "
"%1 not last flag in %4%3")
.arg(param->name, flag, flags, flagPrefix));
else if (m_argStyle == ArgumentStyle::SpaceAndEquals)
expecting.append(param->name);
else
throw ParsingError(QString("Option %1 reqires an argument. (flag %3%2)")
.arg(param->name, flag, flagPrefix));
}
}
continue;
}
// must be a positional argument
if (!positionals.hasNext())
throw ParsingError(QString("Too many positional arguments: '%1'").arg(arg));
ParameterDefinition *param = positionals.next();
map[param->name] = arg;
}
// check if we're missing something
if (!expecting.isEmpty())
throw ParsingError(QString("Was still expecting arguments for %2%1").arg(
expecting.join(QString(", ") + optionPrefix), optionPrefix));
// fill out gaps
for (QListIterator<ParameterDefinition *> it(m_definitions); it.hasNext();)
{
ParameterDefinition *param = it.next();
if (!map.contains(param->name))
{
if (isRequired(param))
throw ParsingError(
QStringLiteral("Missing mandatory argument '%1'").arg(param->name));
else
map[param->name] = param->defaultValue;
}
}
return map;
}
// parsing
QHash<QString, QVariant> Parser::parse(QStringList argv)
{
QHash<QString, QVariant> map;
QStringListIterator it(argv);
QString programName = it.next();
QString optionPrefix;
QString flagPrefix;
QListIterator<PositionalDef *> positionals(m_positionals);
QStringList expecting;
getPrefix(optionPrefix, flagPrefix);
while (it.hasNext())
{
QString arg = it.next();
if (!expecting.isEmpty())
// we were expecting an argument
{
QString name = expecting.first();
/*
if (map.contains(name))
throw ParsingError(
QString("Option %2%1 was given multiple times").arg(name,
optionPrefix));
*/
map[name] = QVariant(arg);
expecting.removeFirst();
continue;
}
if (arg.startsWith(optionPrefix))
// we have an option
{
// qDebug("Found option %s", qPrintable(arg));
QString name = arg.mid(optionPrefix.length());
QString equals;
if ((m_argStyle == ArgumentStyle::Equals ||
m_argStyle == ArgumentStyle::SpaceAndEquals) &&
name.contains("="))
{
int i = name.indexOf("=");
equals = name.mid(i + 1);
name = name.left(i);
}
if (m_options.contains(name))
{
/*
if (map.contains(name))
throw ParsingError(QString("Option %2%1 was given multiple times")
.arg(name, optionPrefix));
*/
OptionDef *option = m_options[name];
if (option->type == otSwitch)
map[name] = true;
else // if (option->type == otOption)
{
if (m_argStyle == ArgumentStyle::Space)
expecting.append(name);
else if (!equals.isNull())
map[name] = equals;
else if (m_argStyle == ArgumentStyle::SpaceAndEquals)
expecting.append(name);
else
throw ParsingError(QString("Option %2%1 reqires an argument.")
.arg(name, optionPrefix));
}
continue;
}
throw ParsingError(QString("Unknown Option %2%1").arg(name, optionPrefix));
}
if (arg.startsWith(flagPrefix))
// we have (a) flag(s)
{
// qDebug("Found flags %s", qPrintable(arg));
QString flags = arg.mid(flagPrefix.length());
QString equals;
if ((m_argStyle == ArgumentStyle::Equals ||
m_argStyle == ArgumentStyle::SpaceAndEquals) &&
flags.contains("="))
{
int i = flags.indexOf("=");
equals = flags.mid(i + 1);
flags = flags.left(i);
}
for (int i = 0; i < flags.length(); i++)
{
QChar flag = flags.at(i);
if (!m_flags.contains(flag))
throw ParsingError(QString("Unknown flag %2%1").arg(flag, flagPrefix));
OptionDef *option = m_flags[flag];
/*
if (map.contains(option->name))
throw ParsingError(QString("Option %2%1 was given multiple
times")
.arg(option->name, optionPrefix));
*/
if (option->type == otSwitch)
map[option->name] = true;
else // if (option->type == otOption)
{
if (m_argStyle == ArgumentStyle::Space)
expecting.append(option->name);
else if (!equals.isNull())
if (i == flags.length() - 1)
map[option->name] = equals;
else
throw ParsingError(QString("Flag %4%2 of Argument-requiring Option "
"%1 not last flag in %4%3")
.arg(option->name, flag, flags, flagPrefix));
else if (m_argStyle == ArgumentStyle::SpaceAndEquals)
expecting.append(option->name);
else
throw ParsingError(QString("Option %1 reqires an argument. (flag %3%2)")
.arg(option->name, flag, flagPrefix));
}
}
continue;
}
// must be a positional argument
if (!positionals.hasNext())
throw ParsingError(QString("Don't know what to do with '%1'").arg(arg));
PositionalDef *param = positionals.next();
map[param->name] = arg;
}
// check if we're missing something
if (!expecting.isEmpty())
throw ParsingError(QString("Was still expecting arguments for %2%1").arg(
expecting.join(QString(", ") + optionPrefix), optionPrefix));
while (positionals.hasNext())
{
PositionalDef *param = positionals.next();
if (param->required)
throw ParsingError(
QString("Missing required positional argument '%1'").arg(param->name));
else
map[param->name] = param->def;
}
// fill out gaps
QListIterator<OptionDef *> iter(m_optionList);
while (iter.hasNext())
{
OptionDef *option = iter.next();
if (!map.contains(option->name))
map[option->name] = option->def;
}
return map;
}
