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/*************************************************************************
** SpecialManager.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2011 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 <iomanip>
#include <sstream>
#include "SpecialActions.h"
#include "SpecialManager.h"
#include "macros.h"
using namespace std;
SpecialManager::~SpecialManager () {
unregisterHandlers();
}
void SpecialManager::unregisterHandlers () {
FORALL(_pool, vector<SpecialHandler*>::iterator, it)
delete *it;
}
/** Registers a single special handler. This method doesn't check if a
* handler of the same class is already registered.
* @param[in] pointer to handler to be registered */
void SpecialManager::registerHandler (SpecialHandler *handler) {
if (handler) {
// get array of prefixes this handler is responsible for
_pool.push_back(handler);
for (const char **p=handler->prefixes(); *p; ++p)
_handlers[*p] = handler;
if (handler->isEndPageListener())
_endPageListeners.push_back(handler);
if (handler->isPositionListener())
_positionListeners.push_back(handler);
}
}
/** Registers a multiple special handlers.
* If ignorelist == 0, all given handlers are registered. To exclude selected sets of
* specials, the corresponding names can be given separated by non alpha-numeric characters,
* e.g. "color, ps, em" or "color: ps em" etc.
* @param[in] handlers pointer to zero-terminated array of handlers to be registered
* @param[in] ignorelist list of special names to be ignored */
void SpecialManager::registerHandlers (SpecialHandler **handlers, const char *ignorelist) {
if (handlers) {
string ign = ignorelist ? ignorelist : "";
FORALL(ign, string::iterator, it)
if (!isalnum(*it))
*it = '%';
ign = "%"+ign+"%";
for (; *handlers; handlers++) {
if (ign.find("%"+string((*handlers)->name())+"%") == string::npos)
registerHandler(*handlers);
else
delete *handlers;
}
}
}
/** Looks for an appropriate handler for a given special prefix.
* @param[in] prefix the special prefix, e.g. "color" or "em"
* @return in case of success: pointer to handler, 0 otherwise */
SpecialHandler* SpecialManager::findHandler (const string &prefix) const {
ConstIterator it = _handlers.find(prefix);
if (it != _handlers.end())
return it->second;
return 0;
}
/** Executes a special command.
* @param[in] special the special expression
* @param[in] actions actions the special handlers can perform
* @param[in] listener object that wants to be notified about the processing state
* @return true if a special handler was found
* @throw SpecialException in case of errors during special processing */
bool SpecialManager::process (const string &special, SpecialActions *actions, Listener *listener) const {
istringstream iss(special);
string prefix;
int c;
while (isalnum(c=iss.get()))
prefix += c;
if (ispunct(c)) // also add seperation character to identifying prefix
prefix += c;
if (prefix == "ps:" && iss.peek() == ':')
prefix += iss.get();
if (SpecialHandler *handler = findHandler(prefix)) {
if (listener)
listener->beginSpecial(prefix.c_str());
bool ret = handler->process(prefix.c_str(), iss, actions);
if (listener)
listener->endSpecial(prefix.c_str());
return ret;
}
return false;
}
void SpecialManager::notifyEndPage () const {
FORALL(_endPageListeners, HandlerPool::const_iterator, it)
(*it)->dviEndPage();
}
void SpecialManager::notifyPositionChange (double x, double y) const {
FORALL(_positionListeners, HandlerPool::const_iterator, it)
(*it)->dviMovedTo(x, y);
}
void SpecialManager::writeHandlerInfo (ostream &os) const {
typedef map<string, SpecialHandler*> SortMap;
SortMap m;
FORALL(_handlers, ConstIterator, it)
m[it->second->name()] = it->second;
FORALL(m, SortMap::iterator, it) {
os << setw(10) << left << it->second->name() << ' ';
if (it->second->info())
os << it->second->info();
os << endl;
}
}
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