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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 "glk/archetype/interpreter.h"
#include "glk/archetype/archetype.h"
#include "glk/archetype/misc.h"
#include "glk/archetype/saveload.h"
#include "glk/archetype/timestamp.h"
#include "glk/archetype/wrap.h"
namespace Glk {
namespace Archetype {
int MainObject;
void interpreter_init() {
MainObject = 0;
}
StringPtr MakeNewDynStr(const String &s) {
return NewDynStr(s);
}
int find_message(const String &message) {
void *p;
for (uint i = 1; i <= g_vm->Vocabulary.size(); ++i) {
if (!index_xarray(g_vm->Vocabulary, i, p))
g_vm->writeln("Internal error - cannot index element %d of Vocabulary", i);
else if (message == *((StringPtr)p))
return i;
}
return 0;
}
bool convert_to(AclType target_type, ResultType &the_scalar) {
int code;
char dir_from = '\0';
int the_number = -1;
String s1;
void *p;
bool boolval = false;
if (target_type == the_scalar._kind)
return true;
switch (target_type) {
case QUOTE_LIT:
case TEXT_LIT:
case IDENT:
case RESERVED:
return false;
default:
break;
}
switch (the_scalar._kind) {
case NUMERIC:
dir_from = 'N';
the_number = the_scalar._data._numeric.acl_int;
break;
case MESSAGE:
dir_from = 'S';
if (index_xarray(g_vm->Vocabulary, the_scalar._data._msgTextQuote.index, p))
s1 = *(StringPtr)p;
break;
case TEXT_LIT:
case QUOTE_LIT:
dir_from = 'S';
if (index_xarray(g_vm->Literals, the_scalar._data._msgTextQuote.index, p))
s1 = *(StringPtr)p;
break;
case STR_PTR:
// string memory will be disposed ONLY if successful convert
dir_from = 'S';
s1 = *the_scalar._data._str.acl_str;
break;
case IDENT:
//with the_scalar do begin
dir_from = 'S';
switch (the_scalar._data._ident.ident_kind) {
case ENUMERATE_ID:
dir_from = 'N';
the_number = the_scalar._data._ident.ident_int;
break;
case OBJECT_ID:
if (the_scalar._data._ident.ident_int == 0)
s1 = "system";
else if (index_xarray(g_vm->Object_ID_List, the_scalar._data._ident.ident_int, p)) {
if (p == nullptr)
s1 = "null";
else
s1 = *(StringPtr)p;
} else {
return false;
}
break;
case TYPE_ID:
if (the_scalar._data._ident.ident_int == 0)
s1 = "null";
else if (index_xarray(g_vm->Type_ID_List, the_scalar._data._ident.ident_int, p))
s1 = *(StringPtr)p;
else
return false;
break;
case ATTRIBUTE_ID:
if (index_xarray(g_vm->Attribute_ID_List, the_scalar._data._ident.ident_int, p))
s1 = *((StringPtr)p);
else
return false;
break;
default:
break;
}
break;
case RESERVED:
if (the_scalar._data._reserved.keyword == RW_TRUE || the_scalar._data._reserved.keyword == RW_FALSE) {
dir_from = 'B';
boolval = (the_scalar._data._reserved.keyword == RW_TRUE);
} else {
return false;
}
break;
default:
break;
}
if (target_type == STR_PTR || target_type == MESSAGE) {
if (the_scalar._kind == STR_PTR)
FreeDynStr(the_scalar._data._str.acl_str); // we know this will succeed
the_scalar._kind = target_type;
switch (dir_from) {
case 'N':
s1 = String::format("%d", the_number);
break;
case 'B':
s1 = boolval ? "TRUE" : "false";
break;
default:
break;
}
if (target_type == MESSAGE)
the_scalar._data._msgTextQuote.index = find_message(s1);
else
the_scalar._data._str.acl_str = NewDynStr(s1);
return true;
} else {
// numeric conversions
switch (dir_from) {
case 'N':
the_scalar._kind = NUMERIC;
the_scalar._data._numeric.acl_int = the_number;
return true;
case 'B':
the_scalar._kind = NUMERIC;
the_scalar._data._numeric.acl_int = boolval ? 1 : 0;
break;
case 'S':
s1.trim();
the_number = s1.val(&code);
if (code != 0) {
return false;
} else {
// successful
if (the_scalar._kind == STR_PTR)
FreeDynStr(the_scalar._data._str.acl_str); // memory no longer needed
the_scalar._kind = NUMERIC;
the_scalar._data._numeric.acl_int = the_number;
}
return true;
default:
break;
}
}
return false;
}
void undefine(ResultType &result) {
result._kind = RESERVED;
result._data._reserved.keyword = RW_UNDEFINED;
}
void cleanup(ResultType &result) {
if (result._kind == STR_PTR)
FreeDynStr(result._data._str.acl_str);
result._kind = RESERVED;
result._data._reserved.keyword = RW_UNDEFINED;
}
void copy_result(ResultType &r1, const ResultType &r2) {
cleanup(r1);
r1 = r2;
if (r1._kind == STR_PTR)
r1._data._str.acl_str = NewDynStr(*r2._data._str.acl_str);
}
bool result_compare(short comparison, ResultType &r1, ResultType &r2) {
bool verdict = false;
// Try numeric reckoning first, then string reckoning
if (convert_to(NUMERIC, r1) && convert_to(NUMERIC, r2)) {
switch (comparison) {
case OP_EQ:
case OP_NE:
verdict = r1._data._numeric.acl_int == r2._data._numeric.acl_int;
break;
case OP_LT:
verdict = r1._data._numeric.acl_int < r2._data._numeric.acl_int;
break;
case OP_LE:
verdict = r1._data._numeric.acl_int <= r2._data._numeric.acl_int;
break;
case OP_GT:
verdict = r1._data._numeric.acl_int > r2._data._numeric.acl_int;
break;
case OP_GE:
verdict = r1._data._numeric.acl_int >= r2._data._numeric.acl_int;
break;
default:
break;
}
} else if (convert_to(STR_PTR, r1) && convert_to(STR_PTR, r2)) {
switch (comparison) {
case OP_EQ:
case OP_NE:
verdict = *r1._data._str.acl_str == *r2._data._str.acl_str;
break;
case OP_LT:
verdict = *r1._data._str.acl_str < *r2._data._str.acl_str;
break;
case OP_LE:
verdict = *r1._data._str.acl_str <= *r2._data._str.acl_str;
break;
case OP_GT:
verdict = *r1._data._str.acl_str > *r2._data._str.acl_str;
break;
case OP_GE:
verdict = *r1._data._str.acl_str >= *r2._data._str.acl_str;
break;
default:
break;
}
} else if (r1._kind == r2._kind) {
switch (r1._kind) {
case RESERVED:
switch (comparison) {
case OP_EQ:
case OP_NE:
verdict = r1._data._reserved.keyword == r2._data._reserved.keyword;
break;
default:
break;
}
case IDENT:
if (r1._data._ident.ident_kind == r2._data._ident.ident_kind) {
switch (comparison) {
case OP_EQ:
case OP_NE:
verdict = r1._data._ident.ident_int == r2._data._ident.ident_int;
break;
default:
break;
}
}
break;
default:
break;
}
}
if (comparison == OP_NE)
return !verdict;
else
return verdict;
}
bool assignment(ResultType &target, ResultType &value) {
ExprPtr e;
if (target._kind != ATTR_PTR) {
wraperr("Warning: attempted assignment to a non-attribute");
return false;
} else {
e = (ExprPtr)target._data._attr.acl_attr->data;
// If the current expression starts with an operator, we know it isn't a flat result
// and must therefore be disposed of before proceeding. Otherwise simply clean up
// the previous expression node
if (e->_kind != OPER) {
cleanup(*e);
} else {
dispose_expr(e);
e = new ExprNode();
undefine(*e);
}
}
copy_result(*e, value);
target._data._attr.acl_attr->data = e;
return true;
}
void write_result(ResultType &result) {
ResultType r1;
undefine(r1);
if (result._kind == STR_PTR)
debugN(result._data._str.acl_str->c_str());
else if (result._kind == RESERVED)
debugN(Reserved_Wds[result._data._reserved.keyword]);
else {
if (result._kind == ATTR_PTR)
copy_result(r1, *(ResultType *)result._data._attr.acl_attr->data);
else
copy_result(r1, result);
if (convert_to(STR_PTR, r1))
debugN(r1._data._str.acl_str->c_str());
cleanup(r1);
}
}
void display_result(ResultType &result) {
String enclose;
switch (result._kind) {
case STR_PTR:
case TEXT_LIT:
enclose = "\"";
break;
case QUOTE_LIT:
enclose = " ";
wrapout(">>", false);
break;
case MESSAGE:
enclose = "\'";
default:
enclose = ' ';
}
if (enclose != " ")
debugN(enclose.c_str());
write_result(result);
if (enclose != " ")
debugN(enclose.c_str());
}
void display_expr(ExprTree the_tree) {
if (the_tree->_kind != OPER) {
display_result(*the_tree);
} else {
if (Binary[the_tree->_data._oper.op_name]) {
debugN(" (");
display_expr(the_tree->_data._oper.left);
debugN(") ");
}
wrapout(Operators[the_tree->_data._oper.op_name], false);
debugN(" (");
display_expr(the_tree->_data._oper.right);
debugN(") ");
}
}
bool load_game(Common::ReadStream *f_in) {
int length;
char ch = '\0';
double fileVersion;
// First, check the initial version string against that in the misc unit
length = strlen(VERSION_STUB);
for (int i = 0; i < length; ++i) {
ch = (char)f_in->readByte();
if (ch != VERSION_STUB[i]) {
g_vm->writeln("This file is not an Archetype file.");
return false;
}
}
// Get the textual version of the game's version. This is easier than dealing with
// the Pascal Real type the game files use for their version number
String versionStr;
while (!f_in->eos() && (ch = (char)f_in->readByte()) != '\n')
versionStr += ch;
fileVersion = atof(versionStr.c_str());
// Bleed off string version information
while (!f_in->eos() && ch != 26)
ch = f_in->readByte();
// Skip over 6 byte Real encoded version number
(void)f_in->readUint32LE();
(void)f_in->readUint16LE();
if (fileVersion > VERSION_NUM) {
g_vm->writeln("This version of PERFORM is %.1f; file version is %.1f",
VERSION_NUM, fileVersion);
g_vm->writeln("Cannot PERFORM this file.");
return false;
}
// Get encryption information
Encryption = (EncryptionType)f_in->readByte();
// Read the timestamp. It is used to verify saved game states, and also to prime the encryption
GTimeStamp = f_in->readUint32LE();
// Initialize the encrypter. This is done by using the global time stamp as a starting point
// and using the Encryption variable to decide the method. Be careful here; the PURPLE
// or Dynamic encryption works differently in that we have to set Encryption to UNPURPLE
// (since we're decoding) and then back to PURPLE again in case they save any game states.
// See load_game_state in the GAMESTAT unit for similar machinations
if (Encryption == PURPLE)
Encryption = UNPURPLE;
cryptinit(Encryption, GTimeStamp);
// Where's the main object?
MainObject = f_in->readUint16LE();
load_obj_list(f_in, g_vm->Object_List);
load_obj_list(f_in, g_vm->Type_List);
load_text_list(f_in, g_vm->Literals);
load_text_list(f_in, g_vm->Vocabulary);
if (Encryption == DEBUGGING_ON) {
g_vm->writeln("Loading debugging information");
load_id_info(f_in);
}
if (Encryption == UNPURPLE)
Encryption = PURPLE;
return true;
}
} // End of namespace Archetype
} // End of namespace Glk
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