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/*
session.cc, copyright (c) 2006,2008 by Vincent Fourmond:
The class embedding a whole SCalc session, implementation.
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 (in the COPYING file).
*/
#include <calc_internals.hh>
namespace SCalc {
std::string version()
{
return std::string(PACKAGE_VERSION);
}
Session::Session()
{
FuncDef::register_common_functions(this);
}
/** Does the actual job of evaluating a statement.
If the returned expression is not NULL, it should
be deleted.
*/
ParserResult * Session::eval(const char * str)
{
Scanner s(str, this);
return s.scan();
}
void Session::eval_and_free(const char * str)
{
ParserResult * res = eval(str);
if(res->can_delete())
delete res;
}
// Not inline, to avoid missing symbols...
int Session::register_varname(const char * str)
{
return register_varname(std::string(str));
}
int Session::register_varname(const std::string &varname)
{
std::map<std::string,int>::iterator i = variables_numbers.find(varname);
if(i == variables_numbers.end())
{ // not found
int j;
variables.push_back(varname);
j = variables.size() - 1;
variables_numbers[varname] = j;
return j;
}
else
return i->second;
}
const char * Session::varname(int id)
{
if(id < (int) variables.size() && id >= 0)
return variables[id].c_str();
else return "invalid varname";
}
int Session::set_var(int id, double val)
{
if(id >= 0 && id < (int) variables.size())
values[id] = val;
else
return 0; /* failed */
return 1; /* success */
}
void Session::fill_default(double * val)
{
for(std::map<int, double>::iterator i = values.begin();
i != values.end(); i++)
val[i->first] = i->second;
}
int Session::evaluable(Expression * expr)
{
std::set<int> used = expr->used_variables();
int retval = 1;
for(std::set<int>::iterator i = used.begin();
i != used.end(); i++)
if(values.find(*i) == values.end())
{
retval = 0; // we have found one that isn't there
break;
}
return retval;
}
/// Returns the number of the corresponding slot in functions.
int Session::get_func(std::string name)
{
if(functions_numbers.find(name) == functions_numbers.end())
return -1; // not found
return functions_numbers[name];
}
int Session::register_func_def(FuncDef * def)
{
if(def->name().empty() ||
get_func(def->name()) != -1)
return 0; /* fails to register in that case */
/* now, the actual registering stuff */
int i = functions.size();
functions.push_back(def);
functions_numbers[std::string(def->name())] = i;
return 1; // success !
}
FuncDef * Session::get_func_def(std::string name)
{
int i = get_func(name);
if(i >= 0)
return functions[i];
else
return NULL;
}
int Session::replace_func_def(FuncDef * def)
{
if(def->name().empty())
return 0; /* fails to register in that case */
int i = get_func(def->name());
if(i < 0)
return register_func_def(def);
delete functions[i];
functions[i] = def;
return 1; // success !
}
/* destruction of the Session */
Session::~Session()
{
// We first need to make sure that the objects listed in functions
// reference only "named" functions
for(int i = 0; i < nb_funcs(); i++)
functions[i]->destroy_anonymous_derivatives();
// Once this is sure, we can delete them.
for(int i = 0; i < nb_funcs(); i++)
delete functions[i];
functions.clear();
}
std::vector<std::string> Session::func_names()
{
std::vector<std::string> res;
for(int i = 0; i < nb_funcs(); i++)
res.push_back(functions[i]->name());
return res;
}
int Session::nb_args_func(std::string name)
{
FuncDef * f = get_func_def(name);
if(f)
return f->nb_params();
return -1; // didn't work out which function...
}
int Session::unset_var(int i)
{
std::map<int, double>::iterator el = values.find(i);
if( el == values.end())
return 0;
values.erase(el);
return 1;
}
int Session::unset_var(std::string name)
{
std::map<std::string,int>::iterator i = variables_numbers.find(name);
if(i != variables_numbers.end())
return unset_var(i->second);
else
return 0; // there is no such variable.
}
Expression * Session::constant(double value)
{
return new Const(this, value);
}
};
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