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// * This file is part of the COLOBOT source code
// * Copyright (C) 2001-2008, Daniel ROUX & EPSITEC SA, www.epsitec.ch
// *
// * 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/.
///////////////////////////////////////////////////
// expression of type Opérande1 > Opérande2
// Opérande1 != Opérande2
// etc.
#include "CBot.h"
// various constructeurs
CBotCompExpr::CBotCompExpr()
{
m_leftop =
m_rightop = NULL;
name = "CBotCompExpr";
}
CBotCompExpr::~CBotCompExpr()
{
delete m_leftop;
delete m_rightop;
}
fichier plus utilise;
// compile instruction of type A < B
CBotInstr* CBotCompExpr::Compile(CBotToken* &p, CBotCStack* pStack)
{
CBotCStack* pStk = pStack->AddStack();
CBotInstr* left = CBotAddExpr::Compile( p, pStk ); // expression A + B left
if (left == NULL) return pStack->Return(NULL, pStk); // error
if ( p->GetType() == ID_HI ||
p->GetType() == ID_LO ||
p->GetType() == ID_HS ||
p->GetType() == ID_LS ||
p->GetType() == ID_EQ ||
p->GetType() == ID_NE) // the various comparisons
{
CBotCompExpr* inst = new CBotCompExpr(); // element for operation
inst->SetToken(p); // stores the operation
int type1, type2;
type1 = pStack->GetType();
p = p->Next();
if ( NULL != (inst->m_rightop = CBotAddExpr::Compile( p, pStk )) ) // expression A + B right
{
type2 = pStack->GetType();
// are the results compatible
if ( type1 == type2 )
{
inst->m_leftop = left;
pStk->SetVar(new CBotVar(NULL, CBotTypBoolean));
// the result is a boolean
return pStack->Return(inst, pStk);
}
}
delete left;
delete inst;
return pStack->Return(NULL, pStk);
}
return pStack->Return(left, pStk);
}
// perform the operation
bool CBotCompExpr::Execute(CBotStack* &pStack)
{
CBotStack* pStk1 = pStack->AddStack(this);
// if ( pStk1 == EOX ) return TRUE;
if ( pStk1->GetState() == 0 && !m_leftop->Execute(pStk1) ) return FALSE; // interrupted here ?
pStk1->SetState(1); // finished
// requires a little more stack to not touch the result of the left
CBotStack* pStk2 = pStk1->AddStack();
if ( !m_rightop->Execute(pStk2) ) return FALSE; // interrupted here ?
int type1 = pStk1->GetType();
int type2 = pStk2->GetType();
CBotVar* result = new CBotVar( NULL, CBotTypBoolean );
switch (GetTokenType())
{
case ID_LO:
result->Lo(pStk1->GetVar(), pStk2->GetVar()); // lower
break;
case ID_HI:
result->Hi(pStk1->GetVar(), pStk2->GetVar()); // higher
break;
case ID_LS:
result->Ls(pStk1->GetVar(), pStk2->GetVar()); // lower or equal
break;
case ID_HS:
result->Hs(pStk1->GetVar(), pStk2->GetVar()); // higher of equal
break;
case ID_EQ:
result->Eq(pStk1->GetVar(), pStk2->GetVar()); // equal
break;
case ID_NE:
result->Ne(pStk1->GetVar(), pStk2->GetVar()); // not equal
break;
}
pStk2->SetVar(result); // puts the result on the stack
pStk1->Return(pStk2); // frees the stack
return pStack->Return(pStk1); // transmit the result
}
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