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ifstatement.cpp
119 lines (104 loc) · 2.91 KB
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ifstatement.cpp
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/*
* The Doomsday Engine Project -- libcore
*
* Copyright © 2004-2017 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* @par License
* LGPL: http://www.gnu.org/licenses/lgpl.html
*
* <small>This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this program; if not, see:
* http://www.gnu.org/licenses</small>
*/
#include "de/IfStatement"
#include "de/Context"
#include "de/Expression"
#include "de/Value"
#include "de/Writer"
#include "de/Reader"
using namespace de;
IfStatement::~IfStatement()
{
clear();
}
void IfStatement::clear()
{
for (Branches::iterator i = _branches.begin(); i != _branches.end(); ++i)
{
delete i->condition;
delete i->compound;
}
_branches.clear();
}
void IfStatement::newBranch()
{
_branches.push_back(Branch(new Compound()));
}
void IfStatement::setBranchCondition(Expression *condition)
{
_branches.back().condition = condition;
}
Compound &IfStatement::branchCompound()
{
return *_branches.back().compound;
}
void IfStatement::execute(Context &context) const
{
Evaluator &eval = context.evaluator();
for (Branches::const_iterator i = _branches.begin(); i != _branches.end(); ++i)
{
if (eval.evaluate(i->condition).isTrue())
{
context.start(i->compound->firstStatement(), next());
return;
}
}
if (_elseCompound.size())
{
context.start(_elseCompound.firstStatement(), next());
}
else
{
context.proceed();
}
}
void IfStatement::operator >> (Writer &to) const
{
to << dbyte(SerialId::If);
// Branches.
to << duint16(_branches.size());
for (Branches::const_iterator i = _branches.begin(); i != _branches.end(); ++i)
{
DE_ASSERT(i->condition != NULL);
to << *i->condition << *i->compound;
}
to << _elseCompound;
}
void IfStatement::operator << (Reader &from)
{
SerialId id;
from.readAs<dbyte>(id);
if (id != SerialId::If)
{
/// @throw DeserializationError The identifier that species the type of the
/// serialized statement was invalid.
throw DeserializationError("IfStatement::operator <<", "Invalid ID");
}
clear();
// Branches.
duint16 count;
from >> count;
while (count--)
{
newBranch();
setBranchCondition(Expression::constructFrom(from));
from >> branchCompound();
}
from >> _elseCompound;
}