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scummvm/engines/gob/parse_v1.cpp
Max Horn 1d1307de01 GOB: Some more cleanup 
svn-id: r39890
2009-04-07 13:29:13 +00:00

835 lines
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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.
*
* $URL$
* $Id$
*
*/
#include "common/endian.h"
#include "gob/gob.h"
#include "gob/parse.h"
#include "gob/global.h"
#include "gob/inter.h"
namespace Gob {
Parse_v1::Parse_v1(GobEngine *vm) : Parse(vm) {
}
int16 Parse_v1::parseVarIndex(uint16 *arg_0, uint16 *arg_4) {
int16 temp2;
byte *arrDesc;
int16 dim;
int16 dimCount;
int16 operation;
int16 temp;
int16 offset;
int16 val;
operation = *_vm->_global->_inter_execPtr++;
debugC(5, kDebugParser, "var parse = %d", operation);
switch (operation) {
case 23:
case OP_LOAD_VAR_STR:
temp = _vm->_inter->load16() * 4;
debugC(5, kDebugParser, "oper = %d",
(int16) *_vm->_global->_inter_execPtr);
if ((operation == OP_LOAD_VAR_STR) && (*_vm->_global->_inter_execPtr == 13)) {
_vm->_global->_inter_execPtr++;
val = parseValExpr(OP_END_MARKER);
temp += val;
debugC(5, kDebugParser, "parse subscript = %d", val);
}
return temp;
case OP_ARRAY_UINT32:
case OP_ARRAY_STR:
temp = _vm->_inter->load16() * 4;
dimCount = *_vm->_global->_inter_execPtr++;
arrDesc = _vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
offset = 0;
for (dim = 0; dim < dimCount; dim++) {
temp2 = parseValExpr(OP_END_MARKER);
offset = arrDesc[dim] * offset + temp2;
}
offset *= 4;
if (operation != OP_ARRAY_STR)
return temp + offset;
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
temp += parseValExpr(OP_END_MARKER);
}
return offset * _vm->_global->_inter_animDataSize + temp;
default:
return 0;
}
}
int16 Parse_v1::parseValExpr(byte stopToken) {
int16 values[20];
byte operStack[20];
int16 *valPtr;
byte *operPtr;
byte *arrDesc;
byte operation;
int16 temp2;
int16 dim;
int16 dimCount;
int16 temp;
int16 offset;
int16 stkPos;
int16 brackPos;
static int16 flag = 0;
int16 oldflag;
oldflag = flag;
if (flag == 0) {
flag = 1;
printExpr(stopToken);
}
stkPos = -1;
operPtr = operStack - 1;
valPtr = values - 1;
while (true) {
stkPos++;
operPtr++;
valPtr++;
operation = *_vm->_global->_inter_execPtr++;
if ((operation >= OP_LOAD_IMM_INT32) && (operation <= OP_FUNC)) {
*operPtr = OP_LOAD_IMM_INT16;
switch (operation) {
case OP_LOAD_IMM_INT32:
*valPtr = READ_LE_UINT32(_vm->_global->_inter_execPtr);
_vm->_global->_inter_execPtr += 4;
break;
case OP_LOAD_IMM_INT16:
*valPtr = _vm->_inter->load16();
break;
case 23:
*valPtr = (uint16) VAR(_vm->_inter->load16());
break;
case OP_LOAD_VAR_STR:
temp = _vm->_inter->load16() * 4;
_vm->_global->_inter_execPtr++;
temp += parseValExpr(OP_END_MARKER);
*valPtr = READ_VARO_UINT8(temp);
break;
case OP_ARRAY_UINT32:
case OP_ARRAY_STR:
temp = _vm->_inter->load16();
dimCount = *_vm->_global->_inter_execPtr++;
arrDesc = _vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
offset = 0;
for (dim = 0; dim < dimCount; dim++) {
temp2 = parseValExpr(OP_END_MARKER);
offset = arrDesc[dim] * offset + temp2;
}
if (operation == OP_ARRAY_UINT32) {
*valPtr = (uint16) VAR(temp + offset);
} else {
_vm->_global->_inter_execPtr++;
temp2 = parseValExpr(OP_END_MARKER);
*valPtr = READ_VARO_UINT8(temp * 4 + offset * 4 *
_vm->_global->_inter_animDataSize + temp2);
}
break;
case OP_FUNC:
operation = *_vm->_global->_inter_execPtr++;
parseExpr(OP_END_EXPR, 0);
if (operation == FUNC_SQR) {
_vm->_global->_inter_resVal =
_vm->_global->_inter_resVal * _vm->_global->_inter_resVal;
} else if (operation == FUNC_ABS) {
if (_vm->_global->_inter_resVal < 0)
_vm->_global->_inter_resVal = -_vm->_global->_inter_resVal;
} else if (operation == FUNC_RAND) {
_vm->_global->_inter_resVal =
_vm->_util->getRandom(_vm->_global->_inter_resVal);
}
*valPtr = _vm->_global->_inter_resVal;
break;
} // switch
if ((stkPos > 0) && (operPtr[-1] == OP_NEG)) {
stkPos--;
operPtr--;
valPtr--;
operPtr[0] = OP_LOAD_IMM_INT16;
valPtr[0] = -valPtr[1];
}
if ((stkPos > 0) && (operPtr[-1] >= OP_MUL) && (operPtr[-1] <= OP_BITAND)) {
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
switch (operPtr[1]) {
case OP_MUL:
valPtr[0] *= valPtr[2];
break;
case OP_DIV:
valPtr[0] /= valPtr[2];
break;
case OP_MOD:
valPtr[0] %= valPtr[2];
break;
case OP_BITAND:
valPtr[0] &= valPtr[2];
break;
}
} // if ((stkPos > 0) && (cmdPtr[-1] >= OP_MUL) && (cmdPtr[-1] <= OP_BITAND))
continue;
}
if ((operation >= OP_NEG) && (operation <= OP_BEGIN_EXPR)) {
*operPtr = operation;
continue;
}
while (stkPos >= 2) {
if (operPtr[-2] == OP_BEGIN_EXPR) {
stkPos--;
operPtr--;
valPtr--;
operPtr[-1] = operPtr[0];
valPtr[-1] = valPtr[0];
if ((stkPos > 1) && (operPtr[-2] == OP_NEG)) {
valPtr[-2] = OP_LOAD_IMM_INT16;
valPtr[-2] = -valPtr[-1];
stkPos--;
operPtr--;
valPtr--;
}
if ((stkPos > 2) && (operPtr[-2] >= OP_MUL) && (operPtr[-2] <= OP_BITAND)) {
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
switch (operPtr[0]) {
case OP_MUL:
operPtr[-1] *= operPtr[1];
break;
case OP_DIV:
operPtr[-1] /= operPtr[1];
break;
case OP_MOD:
operPtr[-1] %= operPtr[1];
break;
case OP_BITAND:
operPtr[-1] &= operPtr[1];
break;
}
}
if (operation == OP_END_EXPR)
break;
} // operPtr[-2] == OP_BEGIN_EXPR
for (brackPos = (stkPos - 2); (brackPos > 0) &&
(operStack[brackPos] < OP_OR) && (operStack[brackPos] != OP_BEGIN_EXPR);
brackPos--)
;
if ((operStack[brackPos] >= OP_OR) || (operStack[brackPos] == OP_BEGIN_EXPR))
brackPos++;
if ((operPtr[-2] < 2) || (operPtr[-2] > 8))
break;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
switch (operPtr[0]) {
case OP_ADD:
values[brackPos] += valPtr[1];
continue;
case OP_SUB:
values[brackPos] -= valPtr[1];
continue;
case OP_BITOR:
values[brackPos] |= valPtr[1];
continue;
case OP_MUL:
valPtr[-1] *= valPtr[1];
continue;
case OP_DIV:
valPtr[-1] /= valPtr[1];
continue;
case OP_MOD:
valPtr[-1] %= valPtr[1];
continue;
case OP_BITAND:
valPtr[-1] &= valPtr[1];
continue;
}
}
if (operation != OP_END_EXPR) {
if (operation != stopToken)
debugC(5, kDebugParser, "stoptoken error: %d != %d",
operation, stopToken);
flag = oldflag;
return values[0];
}
stkPos--;
operPtr--;
valPtr--;
}
}
int16 Parse_v1::parseExpr(byte stopToken, byte *arg_2) {
int32 values[20];
byte operStack[20];
int32 prevPrevVal;
int32 prevVal;
int32 curVal;
int32 *valPtr;
byte *operPtr;
byte *arrDescPtr;
byte operation;
int16 dimCount;
int16 temp;
int16 temp2;
uint16 offset;
int16 dim;
bool var_1A;
int16 stkPos;
int16 brackStart;
stkPos = -1;
operPtr = operStack - 1;
valPtr = values - 1;
while (true) {
stkPos++;
operPtr++;
valPtr++;
operation = *_vm->_global->_inter_execPtr++;
if ((operation >= OP_LOAD_IMM_INT32) && (operation <= OP_FUNC)) {
switch (operation) {
case OP_LOAD_IMM_INT32:
*operPtr = OP_LOAD_IMM_INT16;
*valPtr = READ_LE_UINT32(_vm->_global->_inter_execPtr);
_vm->_global->_inter_execPtr += 4;
break;
case OP_LOAD_IMM_INT16:
*operPtr = OP_LOAD_IMM_INT16;
*valPtr = _vm->_inter->load16();
break;
case OP_LOAD_IMM_STR:
*operPtr = OP_LOAD_IMM_STR;
*valPtr = encodePtr(_vm->_global->_inter_execPtr, kExecPtr);
_vm->_global->_inter_execPtr +=
strlen((char *) _vm->_global->_inter_execPtr) + 1;
break;
case 23:
*operPtr = OP_LOAD_IMM_INT16;
*valPtr = VAR(_vm->_inter->load16());
break;
case OP_LOAD_VAR_STR:
*operPtr = OP_LOAD_IMM_STR;
temp = _vm->_inter->load16() * 4;
*valPtr = encodePtr(_vm->_inter->_variables->getAddressOff8(temp, 0),
kInterVar);
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
temp += parseValExpr(OP_END_MARKER);
*operPtr = OP_LOAD_IMM_INT16;
*valPtr = READ_VARO_UINT8(temp);
}
break;
case OP_ARRAY_UINT32:
case OP_ARRAY_STR:
*operPtr = operation - 6;
temp = _vm->_inter->load16();
dimCount = *_vm->_global->_inter_execPtr++;
arrDescPtr = _vm->_global->_inter_execPtr;
_vm->_global->_inter_execPtr += dimCount;
offset = 0;
dim = 0;
for (dim = 0; dim < dimCount; dim++) {
temp2 = parseValExpr(OP_END_MARKER);
offset = offset * arrDescPtr[dim] + temp2;
}
if (operation == OP_ARRAY_UINT32) {
*valPtr = VAR(temp + offset);
break;
}
*valPtr = encodePtr(_vm->_inter->_variables->getAddressOff8(
temp * 4 + offset * _vm->_global->_inter_animDataSize * 4, 0),
kInterVar);
if (*_vm->_global->_inter_execPtr == 13) {
_vm->_global->_inter_execPtr++;
temp2 = parseValExpr(OP_END_MARKER);
*operPtr = OP_LOAD_IMM_INT16;
*valPtr = READ_VARO_UINT8(temp * 4 +
offset * 4 * _vm->_global->_inter_animDataSize + temp2);
}
break;
case OP_FUNC:
operation = *_vm->_global->_inter_execPtr++;
parseExpr(OP_END_EXPR, 0);
switch (operation) {
case FUNC_SQR:
_vm->_global->_inter_resVal =
_vm->_global->_inter_resVal * _vm->_global->_inter_resVal;
break;
case FUNC_SQRT1:
case FUNC_SQRT2:
case FUNC_SQRT3:
curVal = 1;
prevVal = 1;
do {
prevPrevVal = prevVal;
prevVal = curVal;
curVal = (curVal + _vm->_global->_inter_resVal / curVal) / 2;
} while ((curVal != prevVal) && (curVal != prevPrevVal));
_vm->_global->_inter_resVal = curVal;
break;
case FUNC_RAND:
_vm->_global->_inter_resVal =
_vm->_util->getRandom(_vm->_global->_inter_resVal);
break;
case FUNC_ABS:
if (_vm->_global->_inter_resVal < 0)
_vm->_global->_inter_resVal = -_vm->_global->_inter_resVal;
break;
}
*operPtr = OP_LOAD_IMM_INT16;
*valPtr = _vm->_global->_inter_resVal;
}
if ((stkPos > 0) && ((operPtr[-1] == OP_NEG) || (operPtr[-1] == OP_NOT))) {
stkPos--;
operPtr--;
valPtr--;
if (*operPtr == OP_NEG) {
*operPtr = OP_LOAD_IMM_INT16;
valPtr[0] = -valPtr[1];
} else if (*operPtr == OP_NOT) {
if (operPtr[1] == GOB_FALSE)
*operPtr = GOB_TRUE;
else
*operPtr = GOB_FALSE;
}
}
if (stkPos <= 0)
continue;
switch (operPtr[-1]) {
case OP_ADD:
if (operPtr[-2] == OP_LOAD_IMM_STR) {
if ((char *) decodePtr(valPtr[-2]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, (char *) decodePtr(valPtr[-2]));
valPtr[-2] = encodePtr((byte *) _vm->_global->_inter_resStr, kResStr);
}
strcat(_vm->_global->_inter_resStr, (char *) decodePtr(valPtr[0]));
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
}
break;
case OP_MUL:
valPtr[-2] *= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_DIV:
valPtr[-2] /= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_MOD:
valPtr[-2] %= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_BITAND:
valPtr[-2] &= valPtr[0];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
}
continue;
} // (op >= OP_LOAD_IMM_INT32) && (op <= OP_FUNC)
if ((operation == stopToken) || (operation == OP_OR) ||
(operation == OP_AND) || (operation == OP_END_EXPR)) {
while (stkPos >= 2) {
var_1A = false;
if ((operPtr[-2] == OP_BEGIN_EXPR) &&
((operation == OP_END_EXPR) || (operation == stopToken))) {
operPtr[-2] = operPtr[-1];
if ((operPtr[-2] == OP_LOAD_IMM_INT16) || (operPtr[-2] == OP_LOAD_IMM_STR))
valPtr[-2] = valPtr[-1];
stkPos--;
operPtr--;
valPtr--;
if (stkPos > 1) {
if (operPtr[-2] == OP_NEG) {
operPtr[-2] = OP_LOAD_IMM_INT16;
valPtr[-2] = -valPtr[-1];
stkPos--;
operPtr--;
valPtr--;
} else if (operPtr[-2] == OP_NOT) {
if (operPtr[-1] == GOB_FALSE)
operPtr[-2] = GOB_TRUE;
else
operPtr[-2] = GOB_FALSE;
stkPos--;
operPtr--;
valPtr--;
}
} // stkPos > 1
if (stkPos > 2) {
switch (operPtr[-2]) {
case OP_MUL:
valPtr[-3] *= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_DIV:
valPtr[-3] /= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_MOD:
valPtr[-3] %= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_BITAND:
valPtr[-3] &= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
} // switch
} // stkPos > 2
if (operation != stopToken)
break;
} // if ((operPtr[-2] == OP_BEGIN_EXPR) && ...)
for (brackStart = (stkPos - 2); (brackStart > 0) &&
(operStack[brackStart] < OP_OR) && (operStack[brackStart] != OP_BEGIN_EXPR);
brackStart--)
;
if ((operStack[brackStart] >= OP_OR) || (operStack[brackStart] == OP_BEGIN_EXPR))
brackStart++;
switch (operPtr[-2]) {
case OP_ADD:
if (operStack[brackStart] == OP_LOAD_IMM_INT16) {
values[brackStart] += valPtr[-1];
} else if (operStack[brackStart] == OP_LOAD_IMM_STR) {
if ((char *) decodePtr(values[brackStart]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, (char *) decodePtr(values[brackStart]));
values[brackStart] =
encodePtr((byte *) _vm->_global->_inter_resStr, kResStr);
}
strcat(_vm->_global->_inter_resStr, (char *) decodePtr(valPtr[-1]));
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
continue;
case OP_SUB:
values[brackStart] -= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
continue;
case OP_BITOR:
values[brackStart] |= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
continue;
case OP_MUL:
valPtr[-3] *= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_DIV:
valPtr[-3] /= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_MOD:
valPtr[-3] %= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_BITAND:
valPtr[-3] &= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_OR:
// (x OR false) == x
// (x OR true) == true
if (operPtr[-3] == GOB_FALSE)
operPtr[-3] = operPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_AND:
// (x AND false) == false
// (x AND true) == x
if (operPtr[-3] == GOB_TRUE)
operPtr[-3] = operPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_LESS:
operPtr[-3] = (cmpHelper(operPtr, valPtr) < 0) ? GOB_TRUE : GOB_FALSE;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_LEQ:
operPtr[-3] = (cmpHelper(operPtr, valPtr) <= 0) ? GOB_TRUE : GOB_FALSE;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_GREATER:
operPtr[-3] = (cmpHelper(operPtr, valPtr) > 0) ? GOB_TRUE : GOB_FALSE;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_GEQ:
operPtr[-3] = (cmpHelper(operPtr, valPtr) >= 0) ? GOB_TRUE : GOB_FALSE;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_EQ:
operPtr[-3] = (cmpHelper(operPtr, valPtr) == 0) ? GOB_TRUE : GOB_FALSE;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
case OP_NEQ:
operPtr[-3] = (cmpHelper(operPtr, valPtr) != 0) ? GOB_TRUE : GOB_FALSE;
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
break;
default:
var_1A = true;
break;
} // switch
if (var_1A)
break;
} // while (stkPos >= 2)
if ((operation == OP_OR) || (operation == OP_AND)) {
if (operPtr[-1] == OP_LOAD_IMM_INT16) {
if (valPtr[-1] != 0)
operPtr[-1] = GOB_TRUE;
else
operPtr[-1] = GOB_FALSE;
}
if (((operation == OP_OR) && (operPtr[-1] == GOB_TRUE)) ||
((operation == OP_AND) && (operPtr[-1] == GOB_FALSE))) {
if ((stkPos > 1) && (operPtr[-2] == OP_BEGIN_EXPR)) {
skipExpr(OP_END_EXPR);
operPtr[-2] = operPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
} else
skipExpr(stopToken);
operation = _vm->_global->_inter_execPtr[-1];
if ((stkPos > 0) && (operPtr[-1] == OP_NOT)) {
if (operPtr[0] == GOB_FALSE)
operPtr[-1] = GOB_TRUE;
else
operPtr[-1] = GOB_FALSE;
stkPos--;
operPtr--;
valPtr--;
}
} else
operPtr[0] = operation;
} else {
stkPos--;
operPtr--;
valPtr--;
}
if (operation != stopToken)
continue;
if (arg_2 != 0)
*arg_2 = operStack[0];
switch (operStack[0]) {
case OP_LOAD_IMM_INT16:
_vm->_global->_inter_resVal = values[0];
break;
case OP_LOAD_IMM_STR:
if ((char *) decodePtr(values[0]) != _vm->_global->_inter_resStr)
strcpy(_vm->_global->_inter_resStr, (char *) decodePtr(values[0]));
break;
case OP_NOT:
if (arg_2 != 0)
*arg_2 ^= 1;
break;
case 23:
case 24:
break;
default:
_vm->_global->_inter_resVal = 0;
if (arg_2 != 0)
*arg_2 = OP_LOAD_IMM_INT16;
break;
}
return 0;
} // (operation == stopToken) || (operation == OP_OR) || (operation == OP_AND) || (operation == OP_END_EXPR)
if (operation < OP_NEG || operation > OP_NOT) {
if (operation < OP_LESS || operation > OP_NEQ)
continue;
if (stkPos > 2) {
if (operPtr[-2] == OP_ADD) {
if (operPtr[-3] == OP_LOAD_IMM_INT16) {
valPtr[-3] += valPtr[-1];
} else if (operPtr[-3] == OP_LOAD_IMM_STR) {
if ((char *) decodePtr(valPtr[-3]) != _vm->_global->_inter_resStr) {
strcpy(_vm->_global->_inter_resStr, (char *) decodePtr(valPtr[-3]));
valPtr[-3] = encodePtr((byte *) _vm->_global->_inter_resStr, kResStr);
}
strcat(_vm->_global->_inter_resStr, (char *) decodePtr(valPtr[-1]));
}
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
} else if (operPtr[-2] == OP_SUB) {
valPtr[-3] -= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
} else if (operPtr[-2] == OP_BITOR) {
valPtr[-3] |= valPtr[-1];
stkPos -= 2;
operPtr -= 2;
valPtr -= 2;
}
}
}
*operPtr = operation;
}
}
} // End of namespace Gob
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