* Implementation of GiNaC's symbolic objects. */
/*
- * GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany
*
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <string>
-#include <stdexcept>
-#include <map>
-
#include "symbol.h"
#include "lst.h"
#include "archive.h"
#include "tostring.h"
#include "utils.h"
+#include "hash_seed.h"
#include "inifcns.h"
+#include <map>
+#include <stdexcept>
+#include <string>
+
namespace GiNaC {
GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(symbol, basic,
// symbol
-symbol::symbol()
- : serial(next_serial++), name(""), TeX_name(""), domain(domain::complex)
+symbol::symbol() : serial(next_serial++), name(""), TeX_name("")
{
setflag(status_flags::evaluated | status_flags::expanded);
}
// realsymbol
-realsymbol::realsymbol()
-{
- domain = domain::real;
-}
+realsymbol::realsymbol() : symbol() { }
// possymbol
-possymbol::possymbol()
-{
- domain = domain::positive;
-}
+possymbol::possymbol() : realsymbol() { }
//////////
// other constructors
// symbol
-symbol::symbol(const std::string & initname, unsigned domain) :
- serial(next_serial++), name(initname), TeX_name(""),
- domain(domain)
+symbol::symbol(const std::string & initname) : serial(next_serial++),
+ name(initname), TeX_name("")
{
setflag(status_flags::evaluated | status_flags::expanded);
}
-symbol::symbol(const std::string & initname, const std::string & texname, unsigned domain) :
- serial(next_serial++), name(initname), TeX_name(texname), domain(domain)
+symbol::symbol(const std::string & initname, const std::string & texname) :
+ serial(next_serial++), name(initname), TeX_name(texname)
{
setflag(status_flags::evaluated | status_flags::expanded);
}
// realsymbol
-realsymbol::realsymbol(const std::string & initname, unsigned domain)
- : symbol(initname, domain) { }
+realsymbol::realsymbol(const std::string & initname) : symbol(initname) { }
-realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned domain)
- : symbol(initname, texname, domain) { }
+realsymbol::realsymbol(const std::string & initname, const std::string & texname)
+ : symbol(initname, texname) { }
// possymbol
-possymbol::possymbol(const std::string & initname, unsigned domain)
- : symbol(initname, domain) { }
+possymbol::possymbol(const std::string & initname) : realsymbol(initname) { }
-possymbol::possymbol(const std::string & initname, const std::string & texname, unsigned domain)
- : symbol(initname, texname, domain) { }
+possymbol::possymbol(const std::string & initname, const std::string & texname)
+ : realsymbol(initname, texname) { }
//////////
// archiving
//////////
-/** Construct object from archive_node. */
-symbol::symbol(const archive_node &n, lst &sym_lst)
- : inherited(n, sym_lst), serial(next_serial++)
+/** Read object from archive_node. */
+void symbol::read_archive(const archive_node &n, lst &sym_lst)
{
- if (!n.find_string("name", name))
- name = std::string("");
- if (!n.find_string("TeXname", TeX_name))
- TeX_name = std::string("");
- if (!n.find_unsigned("domain", domain))
- domain = domain::complex;
- setflag(status_flags::evaluated | status_flags::expanded);
-}
-
-/** Unarchive the object. */
-ex symbol::unarchive(const archive_node &n, lst &sym_lst)
-{
- ex s = (new symbol(n, sym_lst))->setflag(status_flags::dynallocated);
+ inherited::read_archive(n, sym_lst);
+ serial = next_serial++;
+ std::string tmp_name;
+ n.find_string("name", tmp_name);
// If symbol is in sym_lst, return the existing symbol
for (lst::const_iterator it = sym_lst.begin(); it != sym_lst.end(); ++it) {
- if (is_a<symbol>(*it) && (ex_to<symbol>(*it).name == ex_to<symbol>(s).name))
- return *it;
+ if (is_a<symbol>(*it) && (ex_to<symbol>(*it).name == tmp_name)) {
+ *this = ex_to<symbol>(*it);
+ // XXX: This method is responsible for reading realsymbol
+ // and possymbol objects too. But
+ // basic::operator=(const basic& other)
+ // resets status_flags::evaluated if other and *this are
+ // of different types. Usually this is a good idea, but
+ // doing this for symbols is wrong (for one, nothing is
+ // going to set status_flags::evaluated, evaluation will
+ // loop forever). Therefore we need to restore flags.
+ setflag(status_flags::evaluated | status_flags::expanded);
+ return;
+ }
}
+ name = tmp_name;
+ if (!n.find_string("TeXname", TeX_name))
+ TeX_name = std::string("");
+ setflag(status_flags::evaluated | status_flags::expanded);
- // Otherwise add new symbol to list and return it
- sym_lst.append(s);
- return s;
+ setflag(status_flags::dynallocated);
+ sym_lst.append(*this);
}
/** Archive the object. */
n.add_string("name", name);
if (!TeX_name.empty())
n.add_string("TeX_name", TeX_name);
- if (domain != domain::complex)
- n.add_unsigned("domain", domain);
}
//////////
// public
+std::string symbol::get_name() const
+{
+ if (name.empty()) {
+ std::ostringstream s;
+ s << "symbol" << serial;
+ name = s.str();
+ }
+ return name;
+}
+
+// protected
+
void symbol::do_print(const print_context & c, unsigned level) const
{
- if (!name.empty())
- c.s << name;
- else
- c.s << "symbol" << serial;
+ c.s << get_name();
}
void symbol::do_print_latex(const print_latex & c, unsigned level) const
c.s << std::string(level, ' ') << name << " (" << class_name() << ")" << " @" << this
<< ", serial=" << serial
<< std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
- << ", domain=" << domain
+ << ", domain=" << get_domain()
<< std::endl;
}
case info_flags::expanded:
return true;
case info_flags::real:
- return domain == domain::real || domain == domain::positive;
+ return get_domain() == domain::real || get_domain() == domain::positive;
case info_flags::positive:
case info_flags::nonnegative:
- return domain == domain::positive;
+ return get_domain() == domain::positive;
case info_flags::has_indices:
return false;
}
ex symbol::conjugate() const
{
- if (this->domain == domain::complex) {
- return conjugate_function(*this).hold();
- } else {
- return *this;
- }
+ return conjugate_function(*this).hold();
}
ex symbol::real_part() const
{
- if (domain==domain::real || domain==domain::positive)
- return *this;
return real_part_function(*this).hold();
}
ex symbol::imag_part() const
{
- if (domain==domain::real || domain==domain::positive)
- return 0;
return imag_part_function(*this).hold();
}
unsigned symbol::calchash() const
{
- const void* this_tinfo = (const void*)typeid(*this).name();
- hashvalue = golden_ratio_hash((p_int)this_tinfo ^ serial);
+ unsigned seed = make_hash_seed(typeid(*this));
+ hashvalue = golden_ratio_hash(seed ^ serial);
setflag(status_flags::hash_calculated);
return hashvalue;
}
return name;
}
+GINAC_BIND_UNARCHIVER(symbol);
+GINAC_BIND_UNARCHIVER(realsymbol);
+GINAC_BIND_UNARCHIVER(possymbol);
+
//////////
// static member variables
//////////
git://www.ginac.de / ginac.git / blobdiff