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/* $Id$ */
/*
* Copyright (C) 2006 Richard Braun
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <cstdlib>
#include <cstring>
#include <vector>
#include "mtx.h"
#include "mtxvalue.h"
#include "mtxsymbol.h"
#include "mtxexception.h"
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
using namespace std;
struct mtx_special_name MtxSymbol::special_names[] =
{
{"about", about},
{"list", list},
{"quit", quit},
{"exit", quit},
{NULL, NULL}
};
string
about(const MtxSymbol *symbol)
{
return MTX_NOTICE;
}
string
list(const MtxSymbol *symbol)
{
vector<MtxSymbol>::const_iterator iterator;
vector<MtxSymbol> symbols;
string list;
symbols = symbol->getLanguage()->getSymbols();
if (symbols.empty())
return "No registered variable";
list = "List of registered variables :\n";
for (iterator = symbols.begin();
iterator != symbols.end();
iterator++)
list += (*iterator).getName()
+ " = "
+ (*iterator).toString()
+ "\n";
list.erase(list.length() - 1);
return list;
}
string
quit(const MtxSymbol *symbol)
{
std::exit(0);
}
MtxSymbol::MtxSymbol()
{
value = NULL;
language = NULL;
setSpecial();
}
MtxSymbol::MtxSymbol(MtxLanguage *language, const string &name)
{
this->name = name;
value = NULL;
this->language = language;
setSpecial();
}
MtxSymbol::MtxSymbol(MtxLanguage *language, const MtxValue &value)
{
this->value = value.clone();
this->language = language;
setSpecial();
}
MtxSymbol::MtxSymbol(MtxLanguage *language, const string &name,
const MtxValue &value)
{
this->name = name;
this->value = value.clone();
this->language = language;
setSpecial();
}
MtxSymbol::MtxSymbol(const MtxSymbol &symbol)
{
name = symbol.name;
if (symbol.value == NULL)
value = NULL;
else
value = symbol.value->clone();
language = symbol.language;
special = symbol.special;
}
MtxSymbol::~MtxSymbol()
{
if (value != NULL)
delete value;
}
MtxSymbol &
MtxSymbol::operator=(const MtxSymbol &symbol)
{
if (this != &symbol)
{
name = symbol.name;
if (value != NULL)
delete value;
if (symbol.value == NULL)
value = NULL;
else
value = symbol.value->clone();
language = symbol.language;
special = symbol.special;
}
return *this;
}
void
MtxSymbol::setSpecial()
{
if (name.length() == 0)
special = false;
else
{
size_t i;
i = 0;
do
{
if (special_names[i].name == NULL)
{
special = false;
break;
}
else if (name == special_names[i].name)
{
special = true;
break;
}
i++;
}
while (true);
}
}
size_t
MtxSymbol::getSpecial() const
{
size_t i;
if (special == false)
throw MtxException("MtxSymbol::getSpecial() called whereas this->special "
"is false");
i = 0;
do
{
if (name == special_names[i].name)
return i;
i++;
}
while(true);
}
MtxSymbol
MtxSymbol::getSymbol(bool create, bool fail_if_special) const
{
if (special)
{
if (fail_if_special)
throw MtxException("invalid use of special name in expression");
else
return *this;
}
if (name.length() == 0 && create)
throw MtxException("invalid lvalue");
if (!create)
{
if (name.length() == 0)
return *this;
else
return language->getSymbol(name);
}
else
{
language->setSymbol(*this);
return *this;
}
}
string
MtxSymbol::getName() const
{
return name;
}
void
MtxSymbol::setName(const string &name)
{
this->name = name;
}
MtxValue *
MtxSymbol::getValue() const
{
return value;
}
string
MtxSymbol::toString() const
{
if (name.length() == 0)
{
if (value == NULL)
throw MtxException("null value");
return value->toString();
}
else
{
if (special)
return special_names[getSpecial()].function(this);
else
return language->getSymbol(name).value->toString();
}
}
bool
MtxSymbol::isSilent() const
{
throw MtxException("MtxSymbol->isSilent() should never be called");
}
bool
MtxSymbol::isSpecial() const
{
return special;
}
MtxLanguage *
MtxSymbol::getLanguage() const
{
return language;
}
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