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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "mutationofjb/commands/randomcommand.h"
#include "mutationofjb/game.h"
#include "mutationofjb/script.h"
#include "common/debug.h"
#include "common/random.h"
/** @file
* "RANDOM " <numChoices>
*
* RANDOM command randomly picks one of the command blocks that
* follow it and jumps to its start.
*
* These blocks start with "/" and end with "\". The end of a random
* block also ends the current section. The number of blocks must
* match numChoices.
*/
namespace MutationOfJB {
bool RandomCommandParser::parse(const Common::String &line, ScriptParseContext &parseCtx, Command *&command) {
if (line.size() < 8 || !line.hasPrefix("RANDOM")) {
return false;
}
int numChoices = atoi(line.c_str() + 7);
if (parseCtx._pendingRandomCommand) {
// Nested RANDOM commands are unused and not properly supported by the original game.
warning("Ignoring nested RANDOM command.");
} else if (numChoices >= 1) {
RandomCommand *randomCommand = new RandomCommand(static_cast<uint>(numChoices));
parseCtx._pendingRandomCommand = randomCommand;
command = randomCommand;
} else {
warning("Ignoring malformed RANDOM command with %d choices.", numChoices);
}
return true;
}
bool RandomBlockStartParser::parse(const Common::String &line, ScriptParseContext &parseCtx, Command *&) {
if (line != "/") {
return false;
}
if (!parseCtx._pendingRandomCommand) {
warning("Unexpected start of RANDOM block");
}
return true;
}
void RandomBlockStartParser::transition(ScriptParseContext &parseCtx, Command *, Command *newCommand, CommandParser *) {
RandomCommand *randomCommand = parseCtx._pendingRandomCommand;
if (newCommand && randomCommand) {
randomCommand->_choices.push_back(newCommand);
if (randomCommand->_choices.size() == randomCommand->_numChoices) {
parseCtx._pendingRandomCommand = nullptr;
}
}
}
RandomCommand::RandomCommand(uint numChoices)
: _numChoices(numChoices),
_chosenNext(nullptr) {
_choices.reserve(numChoices);
}
Command::ExecuteResult RandomCommand::execute(ScriptExecutionContext &scriptExecCtx) {
assert(!_choices.empty());
Common::RandomSource &rng = scriptExecCtx.getGame().getRandomSource();
uint choice = rng.getRandomNumber(_choices.size() - 1);
_chosenNext = _choices[choice];
return Finished;
}
Command *RandomCommand::next() const {
return _chosenNext;
}
Common::String RandomCommand::debugString() const {
return Common::String::format("RANDOM %u", _numChoices);
}
const RandomCommand::Choices &RandomCommand::getChoices() const {
return _choices;
}
}
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