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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 <core/common/Exceptions.hpp>
#include <core/common/Utils.hpp>
#include "ParserScope.hpp"
namespace ousia {
/* Class ParserScopeBase */
ParserScopeBase::ParserScopeBase() {}
ParserScopeBase::ParserScopeBase(const NodeVector<Node> &nodes) : nodes(nodes)
{
}
Rooted<Node> ParserScopeBase::resolve(const std::vector<std::string> &path,
const Rtti &type, Logger &logger)
{
// Go up the stack and try to resolve the
for (auto it = nodes.rbegin(); it != nodes.rend(); it++) {
std::vector<ResolutionResult> res = (*it)->resolve(path, type);
// Abort if the object could not be resolved
if (res.empty()) {
continue;
}
// Log an error if the object is not unique
if (res.size() > 1) {
logger.error(std::string("The reference \"") +
Utils::join(path, ".") + ("\" is ambigous!"));
logger.note("Referenced objects are:", SourceLocation{},
MessageMode::NO_CONTEXT);
for (const ResolutionResult &r : res) {
logger.note(Utils::join(r.path(), "."), *(r.node));
}
}
return res[0].node;
}
return nullptr;
}
/* Class DeferredResolution */
DeferredResolution::DeferredResolution(const NodeVector<Node> &nodes,
const std::vector<std::string> &path,
const Rtti &type,
ResolutionResultCallback resultCallback,
const SourceLocation &location)
: scope(nodes),
resultCallback(resultCallback),
path(path),
type(type),
location(location)
{
}
bool DeferredResolution::resolve(Logger &logger)
{
Rooted<Node> res = scope.resolve(path, type, logger);
if (res != nullptr) {
try {
resultCallback(res, logger);
}
catch (LoggableException ex) {
logger.log(ex);
}
return true;
}
return false;
}
/* Class ParserScope */
ParserScope::ParserScope(const NodeVector<Node> &nodes)
: ParserScopeBase(nodes), topLevelDepth(nodes.size())
{
}
bool ParserScope::checkUnwound(Logger &logger) const
{
if (nodes.size() != topLevelDepth) {
logger.error("Not all open elements have been closed!",
SourceLocation{}, MessageMode::NO_CONTEXT);
logger.note("Still open elements are: ", SourceLocation{},
MessageMode::NO_CONTEXT);
for (size_t i = topLevelDepth + 1; i < nodes.size(); i++) {
logger.note(std::string("Element of interal type ") +
nodes[i]->type().name +
std::string(" defined here:"),
nodes[i]->getLocation());
}
return false;
}
return true;
}
ParserScope ParserScope::fork() { return ParserScope{nodes}; }
bool ParserScope::join(const ParserScope &fork, Logger &logger)
{
// Make sure the fork has been unwound
if (!fork.checkUnwound(logger)) {
return false;
}
// Insert the deferred resolutions of the fork into our own deferred
// resolution list
deferred.insert(deferred.end(), fork.deferred.begin(), fork.deferred.end());
return true;
}
ParserScope::ParserScope() : topLevelDepth(0) {}
void ParserScope::push(Handle<Node> node)
{
if (nodes.size() == topLevelDepth) {
topLevelNodes.push_back(node);
}
nodes.push_back(node);
}
void ParserScope::pop()
{
if (nodes.size() == topLevelDepth) {
throw LoggableException{"No element here to end!"};
}
nodes.pop_back();
}
NodeVector<Node> ParserScope::getTopLevelNodes() const { return topLevelNodes; }
Rooted<Node> ParserScope::getRoot() const { return nodes.front(); }
Rooted<Node> ParserScope::getLeaf() const { return nodes.back(); }
bool ParserScope::resolve(const std::vector<std::string> &path,
const Rtti &type, Logger &logger,
ResolutionImposterCallback imposterCallback,
ResolutionResultCallback resultCallback,
const SourceLocation &location)
{
if (!resolve(path, type, logger, resultCallback, location)) {
resultCallback(imposterCallback(), logger);
return false;
}
return true;
}
bool ParserScope::resolve(const std::vector<std::string> &path,
const Rtti &type, Logger &logger,
ResolutionResultCallback resultCallback,
const SourceLocation &location)
{
Rooted<Node> res = ParserScopeBase::resolve(path, type, logger);
if (res != nullptr) {
try {
resultCallback(res, logger);
}
catch (LoggableException ex) {
logger.log(ex, location);
}
return true;
}
deferred.emplace_back(nodes, path, type, resultCallback, location);
return false;
}
bool ParserScope::performDeferredResolution(Logger &logger)
{
// Repeat the resolution process as long as something has changed in the
// last iteration (resolving a node may cause other nodes to be resolvable).
while (true) {
// Iterate over all deferred resolution processes,
bool hasChange = false;
for (auto it = deferred.begin(); it != deferred.end();) {
if (it->resolve(logger)) {
it = deferred.erase(it);
hasChange = true;
} else {
it++;
}
}
// Abort if nothing has changed in the last iteration
if (!hasChange) {
break;
}
}
// We were successful if there are no more deferred resolutions
if (deferred.empty()) {
return true;
}
// Output error messages for all elements for which resolution did not
// succeed.
for (const auto &failed : deferred) {
logger.error(std::string("Could not resolve ") + failed.type.name +
std::string(" \"") + Utils::join(failed.path, ".") +
std::string("\""),
failed.location);
}
deferred.clear();
return false;
}
}
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