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/*
Ousía
Copyright (C) 2014, 2015 Benjamin Paaßen, Andreas Stöckel
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sstream>
#include "ParserStack.hpp"
#include <core/common/Utils.hpp>
#include <core/common/Exceptions.hpp>
#include <core/model/Project.hpp>
namespace ousia {
/* A default handler */
class DefaultHandler : public Handler {
public:
using Handler::Handler;
void start(Variant::mapType &args) override {}
void end() override {}
};
static Handler *createDefaultHandler(const HandlerData &handlerData)
{
return new DefaultHandler{handlerData};
}
/* Class Handler */
void Handler::data(const std::string &data, int field)
{
for (auto &c : data) {
if (!Utils::isWhitespace(c)) {
logger().error("Expected command but found character data.");
return;
}
}
}
void Handler::child(std::shared_ptr<Handler> handler)
{
// Do nothing here
}
/* Class HandlerDescriptor */
HandlerInstance HandlerDescriptor::create(const ParserContext &ctx,
std::string name, State parentState,
bool isChild, Variant::mapType &args,
const SourceLocation &location) const
{
Handler *h;
HandlerData data{ctx, name, targetState, parentState, isChild, location};
if (ctor) {
h = ctor(data);
} else {
h = createDefaultHandler(data);
}
// Canonicalize the arguments
arguments.validateMap(args, ctx.getLogger(), true);
h->start(args);
return HandlerInstance(h, this);
}
/* Class ParserStack */
/**
* Returns an Exception that should be thrown when a currently invalid command
* is thrown.
*/
static LoggableException invalidCommand(const std::string &name,
const std::set<std::string> &expected)
{
if (expected.empty()) {
return LoggableException{
std::string{"No nested elements allowed, but got \""} + name +
std::string{"\""}};
} else {
return LoggableException{
std::string{"Expected "} +
(expected.size() == 1 ? std::string{"\""}
: std::string{"one of \""}) +
Utils::join(expected, "\", \"") + std::string{"\", but got \""} +
name + std::string{"\""}};
}
}
std::set<std::string> ParserStack::expectedCommands(State state)
{
std::set<std::string> res;
for (const auto &v : handlers) {
if (v.second.parentStates.count(state)) {
res.insert(v.first);
}
}
return res;
}
void ParserStack::start(std::string name, Variant::mapType &args,
const SourceLocation &location)
{
// Fetch the current handler and the current state
const HandlerInstance *h = stack.empty() ? nullptr : &stack.top();
const State curState = currentState();
bool isChild = false;
// Fetch the correct Handler descriptor for this
const HandlerDescriptor *descr = nullptr;
auto range = handlers.equal_range(name);
for (auto it = range.first; it != range.second; it++) {
const std::set<State> &parentStates = it->second.parentStates;
if (parentStates.count(curState) || parentStates.count(STATE_ALL)) {
descr = &(it->second);
break;
}
}
if (!descr && currentArbitraryChildren()) {
isChild = true;
descr = h->descr;
}
// No descriptor found, throw an exception.
if (!descr) {
throw invalidCommand(name, expectedCommands(curState));
}
// Instantiate the handler and call its start function
stack.emplace(descr->create(ctx, name, curState, isChild, args, location));
}
void ParserStack::start(std::string name, const Variant::mapType &args,
const SourceLocation &location)
{
Variant::mapType argsCopy(args);
start(name, argsCopy);
}
void ParserStack::end()
{
// Check whether the current command could be ended
if (stack.empty()) {
throw LoggableException{"No command to end."};
}
// Remove the current HandlerInstance from the stack
HandlerInstance inst{stack.top()};
stack.pop();
// Call the end function of the last Handler
inst.handler->end();
// Call the "child" function of the parent Handler in the stack
// (if one exists).
if (!stack.empty()) {
stack.top().handler->child(inst.handler);
}
}
void ParserStack::data(const std::string &data, int field)
{
// Check whether there is any command the data can be sent to
if (stack.empty()) {
throw LoggableException{"No command to receive data."};
}
// Pass the data to the current Handler instance
stack.top().handler->data(data, field);
}
}
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