X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fsymbol.cpp;h=2f8afc006700e698779b5bd4bb933d21138b1d10;hp=2657900a99524f43901fa9617aa1d608b508fe20;hb=979b2636e20e037573c7c178a2e99fba282ed711;hpb=e5362a33f72613b324b3714524a8c2e5f7b7f46f

diff --git a/ginac/symbol.cpp b/ginac/symbol.cpp
index 2657900a..2f8afc00 100644
--- a/ginac/symbol.cpp
+++ b/ginac/symbol.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's symbolic objects. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2004 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
@@ -25,107 +25,118 @@
 
 #include "symbol.h"
 #include "lst.h"
-#include "idx.h"
 #include "archive.h"
-#include "debugmsg.h"
+#include "tostring.h"
 #include "utils.h"
+#include "inifcns.h"
 
-#ifndef NO_NAMESPACE_GINAC
 namespace GiNaC {
-#endif // ndef NO_NAMESPACE_GINAC
 
-GINAC_IMPLEMENT_REGISTERED_CLASS_NO_CTORS(symbol, basic)
+GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(symbol, basic,
+  print_func<print_context>(&symbol::do_print).
+  print_func<print_latex>(&symbol::do_print_latex).
+  print_func<print_tree>(&symbol::do_print_tree).
+  print_func<print_python_repr>(&symbol::do_print_python_repr))
 
 //////////
-// default constructor, destructor, copy constructor assignment operator and helpers
+// default constructor
 //////////
 
-symbol::symbol() : inherited(TINFO_symbol)
+// symbol
+
+symbol::symbol()
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(autoname_prefix() + ToString(serial)), TeX_name(name), ret_type(return_types::commutative), ret_type_tinfo(TINFO_symbol), domain(domain::complex)
 {
-	debugmsg("symbol default constructor", LOGLEVEL_CONSTRUCT);
-	serial = next_serial++;
-	name = autoname_prefix()+ToString(serial);
-	asexinfop = new assigned_ex_info;
-	setflag(status_flags::evaluated);
+	setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-symbol::~symbol()
+// realsymbol
+
+realsymbol::realsymbol()
 {
-	debugmsg("symbol destructor", LOGLEVEL_DESTRUCT);
-	destroy(0);
+	domain = domain::real;
 }
 
-symbol::symbol(const symbol & other)
+//////////
+// other constructors
+//////////
+
+// public
+
+// symbol
+
+symbol::symbol(const std::string & initname, unsigned domain)
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), ret_type(return_types::commutative), ret_type_tinfo(TINFO_symbol), domain(domain)
 {
-	debugmsg("symbol copy constructor", LOGLEVEL_CONSTRUCT);
-	copy(other);
+	setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-void symbol::copy(const symbol & other)
+symbol::symbol(const std::string & initname, const std::string & texname, unsigned domain)
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(texname), ret_type(return_types::commutative), ret_type_tinfo(TINFO_symbol), domain(domain)
 {
-	inherited::copy(other);
-	name = other.name;
-	serial = other.serial;
-	asexinfop = other.asexinfop;
-	++asexinfop->refcount;
+	setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-void symbol::destroy(bool call_parent)
+symbol::symbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain)
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(default_TeX_name()), ret_type(rt), ret_type_tinfo(rtt), domain(domain)
 {
-	if (--asexinfop->refcount == 0) {
-		delete asexinfop;
-	}
-	if (call_parent) {
-		inherited::destroy(call_parent);
-	}
+	setflag(status_flags::evaluated | status_flags::expanded);
 }
 
-// how should the following be interpreted?
-// symbol x;
-// symbol y;
-// x=y;
-// probably as: x=ex(y);
+symbol::symbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain)
+ : inherited(TINFO_symbol), asexinfop(new assigned_ex_info), serial(next_serial++), name(initname), TeX_name(texname), ret_type(rt), ret_type_tinfo(rtt), domain(domain)
+{
+	setflag(status_flags::evaluated | status_flags::expanded);
+}
 
-//////////
-// other constructors
-//////////
+// realsymbol
+	
+realsymbol::realsymbol(const std::string & initname, unsigned domain)
+ : symbol(initname, domain) { }
 
-// public
+realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned domain)
+ : symbol(initname, texname, domain) { }
 
-symbol::symbol(const std::string & initname) : inherited(TINFO_symbol)
-{
-	debugmsg("symbol constructor from string", LOGLEVEL_CONSTRUCT);
-	name = initname;
-	serial = next_serial++;
-	asexinfop = new assigned_ex_info;
-	setflag(status_flags::evaluated);
-}
+realsymbol::realsymbol(const std::string & initname, unsigned rt, unsigned rtt, unsigned domain)
+ : symbol(initname, rt, rtt, domain) { }
+
+realsymbol::realsymbol(const std::string & initname, const std::string & texname, unsigned rt, unsigned rtt, unsigned domain)
+ : symbol(initname, texname, rt, rtt, domain) { }
 
 //////////
 // archiving
 //////////
 
 /** Construct object from archive_node. */
-symbol::symbol(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
+symbol::symbol(const archive_node &n, lst &sym_lst)
+ : inherited(n, sym_lst), asexinfop(new assigned_ex_info), serial(next_serial++)
 {
-	debugmsg("symbol constructor from archive_node", LOGLEVEL_CONSTRUCT);
-	serial = next_serial++;
-	if (!(n.find_string("name", name)))
+	if (!n.find_string("name", name))
 		name = autoname_prefix() + ToString(serial);
-	asexinfop = new assigned_ex_info;
-	setflag(status_flags::evaluated);
+	if (!n.find_string("TeXname", TeX_name))
+		TeX_name = default_TeX_name();
+	if (!n.find_unsigned("domain", domain))
+		domain = domain::complex;
+	if (!n.find_unsigned("return_type", ret_type))
+		ret_type = return_types::commutative;
+	if (!n.find_unsigned("return_type_tinfo", ret_type_tinfo))
+		ret_type_tinfo = TINFO_symbol;
+	setflag(status_flags::evaluated | status_flags::expanded);
 }
 
 /** Unarchive the object. */
-ex symbol::unarchive(const archive_node &n, const lst &sym_lst)
+ex symbol::unarchive(const archive_node &n, lst &sym_lst)
 {
 	ex s = (new symbol(n, sym_lst))->setflag(status_flags::dynallocated);
 
 	// If symbol is in sym_lst, return the existing symbol
-	for (unsigned i=0; i<sym_lst.nops(); i++) {
-		if (is_ex_of_type(sym_lst.op(i), symbol) && (ex_to_symbol(sym_lst.op(i)).name == ex_to_symbol(s).name))
-			return sym_lst.op(i);
+	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;
 	}
+
+	// Otherwise add new symbol to list and return it
+	sym_lst.append(s);
 	return s;
 }
 
@@ -134,128 +145,89 @@ void symbol::archive(archive_node &n) const
 {
 	inherited::archive(n);
 	n.add_string("name", name);
+	if (TeX_name != default_TeX_name())
+		n.add_string("TeX_name", TeX_name);
+	if (domain != domain::complex)
+		n.add_unsigned("domain", domain);
+	if (ret_type != return_types::commutative)
+		n.add_unsigned("return_type", ret_type);
+	if (ret_type_tinfo != TINFO_symbol)
+		n.add_unsigned("return_type_tinfo", ret_type_tinfo);
 }
 
 //////////
-// functions overriding virtual functions from bases classes
+// functions overriding virtual functions from base classes
 //////////
 
 // public
 
-basic *symbol::duplicate() const
+void symbol::do_print(const print_context & c, unsigned level) const
 {
-	debugmsg("symbol duplicate", LOGLEVEL_DUPLICATE);
-	return new symbol(*this);
+	c.s << name;
 }
 
-void symbol::print(std::ostream & os, unsigned upper_precedence) const
+void symbol::do_print_latex(const print_latex & c, unsigned level) const
 {
-	debugmsg("symbol print",LOGLEVEL_PRINT);
-	os << name;
+	c.s << TeX_name;
 }
 
-void symbol::printraw(std::ostream & os) const
+void symbol::do_print_tree(const print_tree & c, unsigned level) const
 {
-	debugmsg("symbol printraw",LOGLEVEL_PRINT);
-	os << "symbol(" << "name=" << name << ",serial=" << serial
-	   << ",hash=" << hashvalue << ",flags=" << flags << ")";
+	c.s << std::string(level, ' ') << name << " (" << class_name() << ")" << " @" << this
+	    << ", serial=" << serial
+	    << std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
+	    << ", domain=" << domain
+	    << std::endl;
 }
 
-void symbol::printtree(std::ostream & os, unsigned indent) const
+void symbol::do_print_python_repr(const print_python_repr & c, unsigned level) const
 {
-	debugmsg("symbol printtree",LOGLEVEL_PRINT);
-	os << std::string(indent,' ') << name << " (symbol): "
-	   << "serial=" << serial
-	   << ", hash=" << hashvalue
-	   << " (0x" << std::hex << hashvalue << std::dec << ")"
-	   << ", flags=" << flags << std::endl;
-}
-
-void symbol::printcsrc(std::ostream & os, unsigned type, unsigned upper_precedence) const
-{
-	debugmsg("symbol print csrc", LOGLEVEL_PRINT);
-	os << name;
+	c.s << class_name() << "('" << name;
+	if (TeX_name != default_TeX_name())
+		c.s << "','" << TeX_name;
+	c.s << "')";
 }
 
 bool symbol::info(unsigned inf) const
 {
-	if (inf==info_flags::symbol) return true;
-	if (inf==info_flags::polynomial ||
-	    inf==info_flags::integer_polynomial ||
-	    inf==info_flags::cinteger_polynomial ||
-	    inf==info_flags::rational_polynomial ||
-	    inf==info_flags::crational_polynomial ||
-	    inf==info_flags::rational_function) {
+	if (inf == info_flags::symbol)
 		return true;
-	} else {
+	if (inf == info_flags::polynomial ||
+	    inf == info_flags::integer_polynomial ||
+	    inf == info_flags::cinteger_polynomial ||
+	    inf == info_flags::rational_polynomial ||
+	    inf == info_flags::crational_polynomial ||
+	    inf == info_flags::rational_function)
+		return true;
+	if (inf == info_flags::real)
+		return domain == domain::real;
+	else
 		return inherited::info(inf);
-	}
-}
-
-ex symbol::expand(unsigned options) const
-{
-	return this->hold();
-}
-
-bool symbol::has(const ex & other) const
-{
-	if (is_equal(*other.bp)) return true;
-	return false;
-}
-
-int symbol::degree(const symbol & s) const
-{
-	return compare_same_type(s)==0 ? 1 : 0;
-}
-
-int symbol::ldegree(const symbol & s) const
-{
-	return compare_same_type(s)==0 ? 1 : 0;
-}
-
-ex symbol::coeff(const symbol & s, int n) const
-{
-	if (compare_same_type(s)==0) {
-		return n==1 ? _ex1() : _ex0();
-	} else {
-		return n==0 ? *this : _ex0();
-	}
 }
 
 ex symbol::eval(int level) const
 {
-	if (level == -max_recursion_level) {
+	if (level == -max_recursion_level)
 		throw(std::runtime_error("max recursion level reached"));
-	}
 	
 	if (asexinfop->is_assigned) {
 		setflag(status_flags::evaluated);
-		if (level==1) {
+		if (level==1)
 			return (asexinfop->assigned_expression);
-		} else {
+		else
 			return (asexinfop->assigned_expression).eval(level);
-		}
 	} else {
 		return this->hold();
 	}
 }
 
-ex symbol::subs(const lst & ls, const lst & lr) const
+ex symbol::conjugate() const
 {
-	GINAC_ASSERT(ls.nops()==lr.nops());
-#ifdef DO_GINAC_ASSERT
-	for (unsigned i=0; i<ls.nops(); i++) {
-		GINAC_ASSERT(is_ex_exactly_of_type(ls.op(i),symbol)||
-			   is_ex_of_type(ls.op(i),idx));
-	}
-#endif // def DO_GINAC_ASSERT
-
-	for (unsigned i=0; i<ls.nops(); i++) {
-		if (is_ex_exactly_of_type(ls.op(i),symbol)) {
-			if (compare_same_type(ex_to_symbol(ls.op(i)))==0) return lr.op(i);
-		}
+	if (this->domain == domain::complex) {
+		return GiNaC::conjugate_function(*this).hold();
+	} else {
+		return *this;
 	}
-	return *this;
 }
 
 // protected
@@ -266,16 +238,15 @@ ex symbol::subs(const lst & ls, const lst & lr) const
  *  @see ex::diff */
 ex symbol::derivative(const symbol & s) const
 {
-	if (compare_same_type(s)) {
-		return _ex0();
-	} else {
-		return _ex1();
-	}
+	if (compare_same_type(s))
+		return _ex0;
+	else
+		return _ex1;
 }
 
 int symbol::compare_same_type(const basic & other) const
 {
-	GINAC_ASSERT(is_of_type(other,symbol));
+	GINAC_ASSERT(is_a<symbol>(other));
 	const symbol *o = static_cast<const symbol *>(&other);
 	if (serial==o->serial) return 0;
 	return serial < o->serial ? -1 : 1;
@@ -283,25 +254,14 @@ int symbol::compare_same_type(const basic & other) const
 
 bool symbol::is_equal_same_type(const basic & other) const
 {
-	GINAC_ASSERT(is_of_type(other,symbol));
+	GINAC_ASSERT(is_a<symbol>(other));
 	const symbol *o = static_cast<const symbol *>(&other);
 	return serial==o->serial;
 }
 
-unsigned symbol::return_type(void) const
-{
-	return return_types::commutative;
-}
-   
-unsigned symbol::return_type_tinfo(void) const
-{
-	return tinfo_key;
-}
-
-unsigned symbol::calchash(void) const
+unsigned symbol::calchash() const
 {
-	// return golden_ratio_hash(tinfo()) ^ serial;
-	hashvalue=golden_ratio_hash(golden_ratio_hash(0x55555555U ^ serial));
+	hashvalue = golden_ratio_hash(tinfo() ^ serial);
 	setflag(status_flags::hash_calculated);
 	return hashvalue;
 }
@@ -320,47 +280,67 @@ unsigned symbol::calchash(void) const
 
 void symbol::assign(const ex & value)
 {
-	asexinfop->is_assigned=1;
-	asexinfop->assigned_expression=value;
-	clearflag(status_flags::evaluated);
+	asexinfop->is_assigned = true;
+	asexinfop->assigned_expression = value;
+	clearflag(status_flags::evaluated | status_flags::expanded);
 }
 
-void symbol::unassign(void)
+void symbol::unassign()
 {
 	if (asexinfop->is_assigned) {
-		asexinfop->is_assigned=0;
-		asexinfop->assigned_expression=_ex0();
+		asexinfop->is_assigned = false;
+		asexinfop->assigned_expression = _ex0;
 	}
-	setflag(status_flags::evaluated);
+	setflag(status_flags::evaluated | status_flags::expanded);
 }
 
 // private
 
-std::string & symbol::autoname_prefix(void)
+/** Symbols not constructed with a string get one assigned using this
+ *  prefix and a number. */
+std::string & symbol::autoname_prefix()
 {
-	static std::string * s=new std::string("symbol");
+	static std::string *s = new std::string("symbol");
 	return *s;
 }
 
+/** Return default TeX name for symbol. This recognizes some greek letters. */
+std::string symbol::default_TeX_name() const
+{
+	if (name=="alpha"        || name=="beta"         || name=="gamma"
+	 || name=="delta"        || name=="epsilon"      || name=="varepsilon"
+	 || name=="zeta"         || name=="eta"          || name=="theta"
+	 || name=="vartheta"     || name=="iota"         || name=="kappa"
+	 || name=="lambda"       || name=="mu"           || name=="nu"
+	 || name=="xi"           || name=="omicron"      || name=="pi"
+	 || name=="varpi"        || name=="rho"          || name=="varrho"
+	 || name=="sigma"        || name=="varsigma"     || name=="tau"
+	 || name=="upsilon"      || name=="phi"          || name=="varphi"
+	 || name=="chi"          || name=="psi"          || name=="omega"
+	 || name=="Gamma"        || name=="Delta"        || name=="Theta"
+	 || name=="Lambda"       || name=="Xi"           || name=="Pi"
+	 || name=="Sigma"        || name=="Upsilon"      || name=="Phi"
+	 || name=="Psi"          || name=="Omega")
+		return "\\" + name;
+	else
+		return name;
+}
+
 //////////
 // static member variables
 //////////
 
 // private
 
-unsigned symbol::next_serial=0;
-
-// std::string const symbol::autoname_prefix="symbol";
+unsigned symbol::next_serial = 0;
 
 //////////
 // subclass assigned_ex_info
 //////////
 
 /** Default ctor.  Defaults to unassigned. */
-symbol::assigned_ex_info::assigned_ex_info(void) : is_assigned(0), refcount(1)
+symbol::assigned_ex_info::assigned_ex_info() throw() : is_assigned(false)
 {
 }
 
-#ifndef NO_NAMESPACE_GINAC
 } // namespace GiNaC
-#endif // ndef NO_NAMESPACE_GINAC